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3810 lines
94 KiB
C
3810 lines
94 KiB
C
/* Machine independent support for SVR4 /proc (process file system) for GDB.
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Copyright 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* N O T E S
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For information on the details of using /proc consult section proc(4)
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in the UNIX System V Release 4 System Administrator's Reference Manual.
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The general register and floating point register sets are manipulated by
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separate ioctl's. This file makes the assumption that if FP0_REGNUM is
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defined, then support for the floating point register set is desired,
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regardless of whether or not the actual target has floating point hardware.
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*/
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#include "defs.h"
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#include <sys/types.h>
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#include <time.h>
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#include <sys/fault.h>
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#include <sys/syscall.h>
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#include <sys/procfs.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <stropts.h>
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#include <poll.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include "inferior.h"
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#include "target.h"
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#include "command.h"
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#include "gdbcore.h"
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#include "thread.h"
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#define MAX_SYSCALLS 256 /* Maximum number of syscalls for table */
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#ifndef PROC_NAME_FMT
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#define PROC_NAME_FMT "/proc/%05d"
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#endif
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extern struct target_ops procfs_ops; /* Forward declaration */
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#if 1 /* FIXME: Gross and ugly hack to resolve coredep.c global */
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CORE_ADDR kernel_u_addr;
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#endif
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#ifdef BROKEN_SIGINFO_H /* Workaround broken SGS <sys/siginfo.h> */
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#undef si_pid
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#define si_pid _data._proc.pid
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#undef si_uid
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#define si_uid _data._proc._pdata._kill.uid
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#endif /* BROKEN_SIGINFO_H */
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/* All access to the inferior, either one started by gdb or one that has
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been attached to, is controlled by an instance of a procinfo structure,
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defined below. Since gdb currently only handles one inferior at a time,
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the procinfo structure for the inferior is statically allocated and
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only one exists at any given time. There is a separate procinfo
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structure for use by the "info proc" command, so that we can print
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useful information about any random process without interfering with
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the inferior's procinfo information. */
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struct procinfo {
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struct procinfo *next;
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int pid; /* Process ID of inferior */
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int fd; /* File descriptor for /proc entry */
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char *pathname; /* Pathname to /proc entry */
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int had_event; /* poll/select says something happened */
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int was_stopped; /* Nonzero if was stopped prior to attach */
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int nopass_next_sigstop; /* Don't pass a sigstop on next resume */
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prrun_t prrun; /* Control state when it is run */
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prstatus_t prstatus; /* Current process status info */
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gregset_t gregset; /* General register set */
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fpregset_t fpregset; /* Floating point register set */
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fltset_t fltset; /* Current traced hardware fault set */
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sigset_t trace; /* Current traced signal set */
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sysset_t exitset; /* Current traced system call exit set */
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sysset_t entryset; /* Current traced system call entry set */
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fltset_t saved_fltset; /* Saved traced hardware fault set */
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sigset_t saved_trace; /* Saved traced signal set */
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sigset_t saved_sighold; /* Saved held signal set */
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sysset_t saved_exitset; /* Saved traced system call exit set */
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sysset_t saved_entryset; /* Saved traced system call entry set */
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};
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/* List of inferior process information */
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static struct procinfo *procinfo_list = NULL;
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static struct pollfd *poll_list; /* pollfds used for waiting on /proc */
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static int num_poll_list = 0; /* Number of entries in poll_list */
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static int last_resume_pid = -1; /* Last pid used with procfs_resume */
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/* Much of the information used in the /proc interface, particularly for
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printing status information, is kept as tables of structures of the
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following form. These tables can be used to map numeric values to
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their symbolic names and to a string that describes their specific use. */
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struct trans {
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int value; /* The numeric value */
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char *name; /* The equivalent symbolic value */
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char *desc; /* Short description of value */
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};
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/* Translate bits in the pr_flags member of the prstatus structure, into the
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names and desc information. */
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static struct trans pr_flag_table[] =
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{
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#if defined (PR_STOPPED)
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{ PR_STOPPED, "PR_STOPPED", "Process is stopped" },
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#endif
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#if defined (PR_ISTOP)
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{ PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest" },
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#endif
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#if defined (PR_DSTOP)
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{ PR_DSTOP, "PR_DSTOP", "A stop directive is in effect" },
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#endif
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#if defined (PR_ASLEEP)
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{ PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call" },
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#endif
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#if defined (PR_FORK)
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{ PR_FORK, "PR_FORK", "Inherit-on-fork is in effect" },
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#endif
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#if defined (PR_RLC)
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{ PR_RLC, "PR_RLC", "Run-on-last-close is in effect" },
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#endif
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#if defined (PR_PTRACE)
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{ PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace" },
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#endif
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#if defined (PR_PCINVAL)
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{ PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address" },
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#endif
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#if defined (PR_ISSYS)
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{ PR_ISSYS, "PR_ISSYS", "Is a system process" },
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#endif
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#if defined (PR_STEP)
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{ PR_STEP, "PR_STEP", "Process has single step pending" },
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#endif
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#if defined (PR_KLC)
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{ PR_KLC, "PR_KLC", "Kill-on-last-close is in effect" },
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#endif
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#if defined (PR_ASYNC)
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{ PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect" },
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#endif
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#if defined (PR_PCOMPAT)
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{ PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect" },
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#endif
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{ 0, NULL, NULL }
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};
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/* Translate values in the pr_why field of the prstatus struct. */
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static struct trans pr_why_table[] =
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{
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#if defined (PR_REQUESTED)
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{ PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP" },
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#endif
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#if defined (PR_SIGNALLED)
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{ PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal" },
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#endif
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#if defined (PR_FAULTED)
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{ PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault" },
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#endif
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#if defined (PR_SYSENTRY)
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{ PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call" },
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#endif
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#if defined (PR_SYSEXIT)
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{ PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call" },
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#endif
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#if defined (PR_JOBCONTROL)
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{ PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action" },
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#endif
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#if defined (PR_SUSPENDED)
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{ PR_SUSPENDED, "PR_SUSPENDED", "Process suspended" },
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#endif
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{ 0, NULL, NULL }
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};
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/* Hardware fault translation table. */
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static struct trans faults_table[] =
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{
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#if defined (FLTILL)
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{ FLTILL, "FLTILL", "Illegal instruction" },
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#endif
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#if defined (FLTPRIV)
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{ FLTPRIV, "FLTPRIV", "Privileged instruction" },
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#endif
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#if defined (FLTBPT)
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{ FLTBPT, "FLTBPT", "Breakpoint trap" },
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#endif
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#if defined (FLTTRACE)
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{ FLTTRACE, "FLTTRACE", "Trace trap" },
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#endif
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#if defined (FLTACCESS)
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{ FLTACCESS, "FLTACCESS", "Memory access fault" },
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#endif
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#if defined (FLTBOUNDS)
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{ FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation" },
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#endif
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#if defined (FLTIOVF)
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{ FLTIOVF, "FLTIOVF", "Integer overflow" },
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#endif
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#if defined (FLTIZDIV)
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{ FLTIZDIV, "FLTIZDIV", "Integer zero divide" },
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#endif
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#if defined (FLTFPE)
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{ FLTFPE, "FLTFPE", "Floating-point exception" },
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#endif
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#if defined (FLTSTACK)
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{ FLTSTACK, "FLTSTACK", "Unrecoverable stack fault" },
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#endif
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#if defined (FLTPAGE)
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{ FLTPAGE, "FLTPAGE", "Recoverable page fault" },
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#endif
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{ 0, NULL, NULL }
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};
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/* Translation table for signal generation information. See UNIX System
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V Release 4 Programmer's Reference Manual, siginfo(5). */
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static struct sigcode {
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int signo;
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int code;
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char *codename;
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char *desc;
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} siginfo_table[] = {
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#if defined (SIGILL) && defined (ILL_ILLOPC)
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{ SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode" },
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#endif
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#if defined (SIGILL) && defined (ILL_ILLOPN)
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{ SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand", },
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#endif
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#if defined (SIGILL) && defined (ILL_ILLADR)
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{ SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode" },
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#endif
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#if defined (SIGILL) && defined (ILL_ILLTRP)
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{ SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap" },
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#endif
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#if defined (SIGILL) && defined (ILL_PRVOPC)
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{ SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode" },
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#endif
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#if defined (SIGILL) && defined (ILL_PRVREG)
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{ SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register" },
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#endif
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#if defined (SIGILL) && defined (ILL_COPROC)
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{ SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error" },
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#endif
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#if defined (SIGILL) && defined (ILL_BADSTK)
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{ SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error" },
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#endif
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#if defined (SIGFPE) && defined (FPE_INTDIV)
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{ SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero" },
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#endif
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#if defined (SIGFPE) && defined (FPE_INTOVF)
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{ SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow" },
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#endif
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#if defined (SIGFPE) && defined (FPE_FLTDIV)
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{ SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero" },
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#endif
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#if defined (SIGFPE) && defined (FPE_FLTOVF)
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{ SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow" },
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#endif
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#if defined (SIGFPE) && defined (FPE_FLTUND)
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{ SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow" },
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#endif
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#if defined (SIGFPE) && defined (FPE_FLTRES)
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{ SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result" },
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#endif
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#if defined (SIGFPE) && defined (FPE_FLTINV)
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{ SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation" },
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#endif
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#if defined (SIGFPE) && defined (FPE_FLTSUB)
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{ SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range" },
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#endif
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#if defined (SIGSEGV) && defined (SEGV_MAPERR)
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{ SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object" },
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#endif
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#if defined (SIGSEGV) && defined (SEGV_ACCERR)
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{ SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object" },
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#endif
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#if defined (SIGBUS) && defined (BUS_ADRALN)
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{ SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment" },
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#endif
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#if defined (SIGBUS) && defined (BUS_ADRERR)
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{ SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address" },
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#endif
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#if defined (SIGBUS) && defined (BUS_OBJERR)
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{ SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error" },
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#endif
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#if defined (SIGTRAP) && defined (TRAP_BRKPT)
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{ SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint" },
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#endif
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#if defined (SIGTRAP) && defined (TRAP_TRACE)
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{ SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap" },
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#endif
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#if defined (SIGCLD) && defined (CLD_EXITED)
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{ SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited" },
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#endif
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#if defined (SIGCLD) && defined (CLD_KILLED)
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{ SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed" },
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#endif
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#if defined (SIGCLD) && defined (CLD_DUMPED)
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{ SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally" },
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#endif
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#if defined (SIGCLD) && defined (CLD_TRAPPED)
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{ SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped" },
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#endif
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#if defined (SIGCLD) && defined (CLD_STOPPED)
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{ SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped" },
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#endif
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#if defined (SIGCLD) && defined (CLD_CONTINUED)
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{ SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued" },
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#endif
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#if defined (SIGPOLL) && defined (POLL_IN)
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{ SIGPOLL, POLL_IN, "POLL_IN", "Input input available" },
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#endif
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#if defined (SIGPOLL) && defined (POLL_OUT)
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{ SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available" },
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#endif
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#if defined (SIGPOLL) && defined (POLL_MSG)
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{ SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available" },
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#endif
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#if defined (SIGPOLL) && defined (POLL_ERR)
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{ SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error" },
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#endif
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#if defined (SIGPOLL) && defined (POLL_PRI)
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{ SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available" },
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#endif
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#if defined (SIGPOLL) && defined (POLL_HUP)
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{ SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected" },
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#endif
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{ 0, 0, NULL, NULL }
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};
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static char *syscall_table[MAX_SYSCALLS];
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/* Prototypes for local functions */
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static void set_proc_siginfo PARAMS ((struct procinfo *, int));
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static void init_syscall_table PARAMS ((void));
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static char *syscallname PARAMS ((int));
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static char *signalname PARAMS ((int));
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static char *errnoname PARAMS ((int));
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static int proc_address_to_fd PARAMS ((struct procinfo *, CORE_ADDR, int));
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static int open_proc_file PARAMS ((int, struct procinfo *, int));
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static void close_proc_file PARAMS ((struct procinfo *));
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static void unconditionally_kill_inferior PARAMS ((struct procinfo *));
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static NORETURN void proc_init_failed PARAMS ((struct procinfo *, char *)) ATTR_NORETURN;
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static void info_proc PARAMS ((char *, int));
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static void info_proc_flags PARAMS ((struct procinfo *, int));
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static void info_proc_stop PARAMS ((struct procinfo *, int));
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static void info_proc_siginfo PARAMS ((struct procinfo *, int));
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static void info_proc_syscalls PARAMS ((struct procinfo *, int));
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static void info_proc_mappings PARAMS ((struct procinfo *, int));
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static void info_proc_signals PARAMS ((struct procinfo *, int));
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static void info_proc_faults PARAMS ((struct procinfo *, int));
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static char *mappingflags PARAMS ((long));
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static char *lookupname PARAMS ((struct trans *, unsigned int, char *));
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static char *lookupdesc PARAMS ((struct trans *, unsigned int));
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static int do_attach PARAMS ((int pid));
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static void do_detach PARAMS ((int siggnal));
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static void procfs_create_inferior PARAMS ((char *, char *, char **));
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static void procfs_notice_signals PARAMS ((int pid));
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static struct procinfo *find_procinfo PARAMS ((pid_t pid, int okfail));
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/* External function prototypes that can't be easily included in any
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header file because the args are typedefs in system include files. */
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extern void supply_gregset PARAMS ((gregset_t *));
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extern void fill_gregset PARAMS ((gregset_t *, int));
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extern void supply_fpregset PARAMS ((fpregset_t *));
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extern void fill_fpregset PARAMS ((fpregset_t *, int));
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/*
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LOCAL FUNCTION
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find_procinfo -- convert a process id to a struct procinfo
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SYNOPSIS
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static struct procinfo * find_procinfo (pid_t pid, int okfail);
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DESCRIPTION
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||
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Given a process id, look it up in the procinfo chain. Returns
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a struct procinfo *. If can't find pid, then call error(),
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unless okfail is set, in which case, return NULL;
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*/
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static struct procinfo *
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find_procinfo (pid, okfail)
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pid_t pid;
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int okfail;
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{
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||
struct procinfo *procinfo;
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for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
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if (procinfo->pid == pid)
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return procinfo;
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if (okfail)
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return NULL;
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error ("procfs (find_procinfo): Couldn't locate pid %d", pid);
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}
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/*
|
||
|
||
LOCAL MACRO
|
||
|
||
current_procinfo -- convert inferior_pid to a struct procinfo
|
||
|
||
SYNOPSIS
|
||
|
||
static struct procinfo * current_procinfo;
|
||
|
||
DESCRIPTION
|
||
|
||
Looks up inferior_pid in the procinfo chain. Always returns a
|
||
struct procinfo *. If process can't be found, we error() out.
|
||
*/
|
||
|
||
#define current_procinfo find_procinfo (inferior_pid, 0)
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
add_fd -- Add the fd to the poll/select list
|
||
|
||
SYNOPSIS
|
||
|
||
static void add_fd (struct procinfo *);
|
||
|
||
DESCRIPTION
|
||
|
||
Add the fd of the supplied procinfo to the list of fds used for
|
||
poll/select operations.
|
||
*/
|
||
|
||
static void
|
||
add_fd (pi)
|
||
struct procinfo *pi;
|
||
{
|
||
if (num_poll_list <= 0)
|
||
poll_list = (struct pollfd *) xmalloc (sizeof (struct pollfd));
|
||
else
|
||
poll_list = (struct pollfd *) xrealloc (poll_list,
|
||
(num_poll_list + 1)
|
||
* sizeof (struct pollfd));
|
||
poll_list[num_poll_list].fd = pi->fd;
|
||
poll_list[num_poll_list].events = POLLPRI;
|
||
|
||
num_poll_list++;
|
||
}
|
||
|
||
static void
|
||
remove_fd (pi)
|
||
struct procinfo *pi;
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < num_poll_list; i++)
|
||
{
|
||
if (poll_list[i].fd == pi->fd)
|
||
{
|
||
if (i != num_poll_list - 1)
|
||
memcpy (poll_list, poll_list + i + 1,
|
||
(num_poll_list - i - 1) * sizeof (struct pollfd));
|
||
|
||
num_poll_list--;
|
||
|
||
if (num_poll_list == 0)
|
||
free (poll_list);
|
||
else
|
||
poll_list = (struct pollfd *) xrealloc (poll_list,
|
||
num_poll_list
|
||
* sizeof (struct pollfd));
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
#define LOSING_POLL unixware_sux
|
||
|
||
static struct procinfo *
|
||
wait_fd ()
|
||
{
|
||
struct procinfo *pi;
|
||
int num_fds;
|
||
int i;
|
||
|
||
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
||
attached process. */
|
||
set_sigio_trap ();
|
||
|
||
#ifndef LOSING_POLL
|
||
num_fds = poll (poll_list, num_poll_list, -1);
|
||
#else
|
||
pi = current_procinfo;
|
||
|
||
while (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
|
||
{
|
||
if (errno == ENOENT)
|
||
{
|
||
/* Process exited. */
|
||
pi->prstatus.pr_flags = 0;
|
||
break;
|
||
}
|
||
else if (errno != EINTR)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCWSTOP failed");
|
||
}
|
||
}
|
||
pi->had_event = 1;
|
||
#endif
|
||
|
||
clear_sigint_trap ();
|
||
clear_sigio_trap ();
|
||
|
||
#ifndef LOSING_POLL
|
||
|
||
if (num_fds <= 0)
|
||
{
|
||
print_sys_errmsg ("poll failed\n", errno);
|
||
error ("Poll failed, returned %d", num_fds);
|
||
}
|
||
|
||
for (i = 0; i < num_poll_list && num_fds > 0; i++)
|
||
{
|
||
if ((poll_list[i].revents & (POLLPRI|POLLERR|POLLHUP|POLLNVAL)) == 0)
|
||
continue;
|
||
for (pi = procinfo_list; pi; pi = pi->next)
|
||
{
|
||
if (poll_list[i].fd == pi->fd)
|
||
{
|
||
if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCSTATUS failed");
|
||
}
|
||
num_fds--;
|
||
pi->had_event = 1;
|
||
break;
|
||
}
|
||
}
|
||
if (!pi)
|
||
error ("procfs_wait: Couldn't find procinfo for fd %d\n",
|
||
poll_list[i].fd);
|
||
}
|
||
#endif /* LOSING_POLL */
|
||
|
||
return pi;
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
lookupdesc -- translate a value to a summary desc string
|
||
|
||
SYNOPSIS
|
||
|
||
static char *lookupdesc (struct trans *transp, unsigned int val);
|
||
|
||
DESCRIPTION
|
||
|
||
Given a pointer to a translation table and a value to be translated,
|
||
lookup the desc string and return it.
|
||
*/
|
||
|
||
static char *
|
||
lookupdesc (transp, val)
|
||
struct trans *transp;
|
||
unsigned int val;
|
||
{
|
||
char *desc;
|
||
|
||
for (desc = NULL; transp -> name != NULL; transp++)
|
||
{
|
||
if (transp -> value == val)
|
||
{
|
||
desc = transp -> desc;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Didn't find a translation for the specified value, set a default one. */
|
||
|
||
if (desc == NULL)
|
||
{
|
||
desc = "Unknown";
|
||
}
|
||
return (desc);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
lookupname -- translate a value to symbolic name
|
||
|
||
SYNOPSIS
|
||
|
||
static char *lookupname (struct trans *transp, unsigned int val,
|
||
char *prefix);
|
||
|
||
DESCRIPTION
|
||
|
||
Given a pointer to a translation table, a value to be translated,
|
||
and a default prefix to return if the value can't be translated,
|
||
match the value with one of the translation table entries and
|
||
return a pointer to the symbolic name.
|
||
|
||
If no match is found it just returns the value as a printable string,
|
||
with the given prefix. The previous such value, if any, is freed
|
||
at this time.
|
||
*/
|
||
|
||
static char *
|
||
lookupname (transp, val, prefix)
|
||
struct trans *transp;
|
||
unsigned int val;
|
||
char *prefix;
|
||
{
|
||
static char *locbuf;
|
||
char *name;
|
||
|
||
for (name = NULL; transp -> name != NULL; transp++)
|
||
{
|
||
if (transp -> value == val)
|
||
{
|
||
name = transp -> name;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Didn't find a translation for the specified value, build a default
|
||
one using the specified prefix and return it. The lifetime of
|
||
the value is only until the next one is needed. */
|
||
|
||
if (name == NULL)
|
||
{
|
||
if (locbuf != NULL)
|
||
{
|
||
free (locbuf);
|
||
}
|
||
locbuf = xmalloc (strlen (prefix) + 16);
|
||
sprintf (locbuf, "%s %u", prefix, val);
|
||
name = locbuf;
|
||
}
|
||
return (name);
|
||
}
|
||
|
||
static char *
|
||
sigcodename (sip)
|
||
siginfo_t *sip;
|
||
{
|
||
struct sigcode *scp;
|
||
char *name = NULL;
|
||
static char locbuf[32];
|
||
|
||
for (scp = siginfo_table; scp -> codename != NULL; scp++)
|
||
{
|
||
if ((scp -> signo == sip -> si_signo) &&
|
||
(scp -> code == sip -> si_code))
|
||
{
|
||
name = scp -> codename;
|
||
break;
|
||
}
|
||
}
|
||
if (name == NULL)
|
||
{
|
||
sprintf (locbuf, "sigcode %u", sip -> si_signo);
|
||
name = locbuf;
|
||
}
|
||
return (name);
|
||
}
|
||
|
||
static char *
|
||
sigcodedesc (sip)
|
||
siginfo_t *sip;
|
||
{
|
||
struct sigcode *scp;
|
||
char *desc = NULL;
|
||
|
||
for (scp = siginfo_table; scp -> codename != NULL; scp++)
|
||
{
|
||
if ((scp -> signo == sip -> si_signo) &&
|
||
(scp -> code == sip -> si_code))
|
||
{
|
||
desc = scp -> desc;
|
||
break;
|
||
}
|
||
}
|
||
if (desc == NULL)
|
||
{
|
||
desc = "Unrecognized signal or trap use";
|
||
}
|
||
return (desc);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
syscallname - translate a system call number into a system call name
|
||
|
||
SYNOPSIS
|
||
|
||
char *syscallname (int syscallnum)
|
||
|
||
DESCRIPTION
|
||
|
||
Given a system call number, translate it into the printable name
|
||
of a system call, or into "syscall <num>" if it is an unknown
|
||
number.
|
||
*/
|
||
|
||
static char *
|
||
syscallname (syscallnum)
|
||
int syscallnum;
|
||
{
|
||
static char locbuf[32];
|
||
char *rtnval;
|
||
|
||
if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS)
|
||
{
|
||
rtnval = syscall_table[syscallnum];
|
||
}
|
||
else
|
||
{
|
||
sprintf (locbuf, "syscall %u", syscallnum);
|
||
rtnval = locbuf;
|
||
}
|
||
return (rtnval);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
init_syscall_table - initialize syscall translation table
|
||
|
||
SYNOPSIS
|
||
|
||
void init_syscall_table (void)
|
||
|
||
DESCRIPTION
|
||
|
||
Dynamically initialize the translation table to convert system
|
||
call numbers into printable system call names. Done once per
|
||
gdb run, on initialization.
|
||
|
||
NOTES
|
||
|
||
This is awfully ugly, but preprocessor tricks to make it prettier
|
||
tend to be nonportable.
|
||
*/
|
||
|
||
static void
|
||
init_syscall_table ()
|
||
{
|
||
#if defined (SYS_exit)
|
||
syscall_table[SYS_exit] = "exit";
|
||
#endif
|
||
#if defined (SYS_fork)
|
||
syscall_table[SYS_fork] = "fork";
|
||
#endif
|
||
#if defined (SYS_read)
|
||
syscall_table[SYS_read] = "read";
|
||
#endif
|
||
#if defined (SYS_write)
|
||
syscall_table[SYS_write] = "write";
|
||
#endif
|
||
#if defined (SYS_open)
|
||
syscall_table[SYS_open] = "open";
|
||
#endif
|
||
#if defined (SYS_close)
|
||
syscall_table[SYS_close] = "close";
|
||
#endif
|
||
#if defined (SYS_wait)
|
||
syscall_table[SYS_wait] = "wait";
|
||
#endif
|
||
#if defined (SYS_creat)
|
||
syscall_table[SYS_creat] = "creat";
|
||
#endif
|
||
#if defined (SYS_link)
|
||
syscall_table[SYS_link] = "link";
|
||
#endif
|
||
#if defined (SYS_unlink)
|
||
syscall_table[SYS_unlink] = "unlink";
|
||
#endif
|
||
#if defined (SYS_exec)
|
||
syscall_table[SYS_exec] = "exec";
|
||
#endif
|
||
#if defined (SYS_execv)
|
||
syscall_table[SYS_execv] = "execv";
|
||
#endif
|
||
#if defined (SYS_execve)
|
||
syscall_table[SYS_execve] = "execve";
|
||
#endif
|
||
#if defined (SYS_chdir)
|
||
syscall_table[SYS_chdir] = "chdir";
|
||
#endif
|
||
#if defined (SYS_time)
|
||
syscall_table[SYS_time] = "time";
|
||
#endif
|
||
#if defined (SYS_mknod)
|
||
syscall_table[SYS_mknod] = "mknod";
|
||
#endif
|
||
#if defined (SYS_chmod)
|
||
syscall_table[SYS_chmod] = "chmod";
|
||
#endif
|
||
#if defined (SYS_chown)
|
||
syscall_table[SYS_chown] = "chown";
|
||
#endif
|
||
#if defined (SYS_brk)
|
||
syscall_table[SYS_brk] = "brk";
|
||
#endif
|
||
#if defined (SYS_stat)
|
||
syscall_table[SYS_stat] = "stat";
|
||
#endif
|
||
#if defined (SYS_lseek)
|
||
syscall_table[SYS_lseek] = "lseek";
|
||
#endif
|
||
#if defined (SYS_getpid)
|
||
syscall_table[SYS_getpid] = "getpid";
|
||
#endif
|
||
#if defined (SYS_mount)
|
||
syscall_table[SYS_mount] = "mount";
|
||
#endif
|
||
#if defined (SYS_umount)
|
||
syscall_table[SYS_umount] = "umount";
|
||
#endif
|
||
#if defined (SYS_setuid)
|
||
syscall_table[SYS_setuid] = "setuid";
|
||
#endif
|
||
#if defined (SYS_getuid)
|
||
syscall_table[SYS_getuid] = "getuid";
|
||
#endif
|
||
#if defined (SYS_stime)
|
||
syscall_table[SYS_stime] = "stime";
|
||
#endif
|
||
#if defined (SYS_ptrace)
|
||
syscall_table[SYS_ptrace] = "ptrace";
|
||
#endif
|
||
#if defined (SYS_alarm)
|
||
syscall_table[SYS_alarm] = "alarm";
|
||
#endif
|
||
#if defined (SYS_fstat)
|
||
syscall_table[SYS_fstat] = "fstat";
|
||
#endif
|
||
#if defined (SYS_pause)
|
||
syscall_table[SYS_pause] = "pause";
|
||
#endif
|
||
#if defined (SYS_utime)
|
||
syscall_table[SYS_utime] = "utime";
|
||
#endif
|
||
#if defined (SYS_stty)
|
||
syscall_table[SYS_stty] = "stty";
|
||
#endif
|
||
#if defined (SYS_gtty)
|
||
syscall_table[SYS_gtty] = "gtty";
|
||
#endif
|
||
#if defined (SYS_access)
|
||
syscall_table[SYS_access] = "access";
|
||
#endif
|
||
#if defined (SYS_nice)
|
||
syscall_table[SYS_nice] = "nice";
|
||
#endif
|
||
#if defined (SYS_statfs)
|
||
syscall_table[SYS_statfs] = "statfs";
|
||
#endif
|
||
#if defined (SYS_sync)
|
||
syscall_table[SYS_sync] = "sync";
|
||
#endif
|
||
#if defined (SYS_kill)
|
||
syscall_table[SYS_kill] = "kill";
|
||
#endif
|
||
#if defined (SYS_fstatfs)
|
||
syscall_table[SYS_fstatfs] = "fstatfs";
|
||
#endif
|
||
#if defined (SYS_pgrpsys)
|
||
syscall_table[SYS_pgrpsys] = "pgrpsys";
|
||
#endif
|
||
#if defined (SYS_xenix)
|
||
syscall_table[SYS_xenix] = "xenix";
|
||
#endif
|
||
#if defined (SYS_dup)
|
||
syscall_table[SYS_dup] = "dup";
|
||
#endif
|
||
#if defined (SYS_pipe)
|
||
syscall_table[SYS_pipe] = "pipe";
|
||
#endif
|
||
#if defined (SYS_times)
|
||
syscall_table[SYS_times] = "times";
|
||
#endif
|
||
#if defined (SYS_profil)
|
||
syscall_table[SYS_profil] = "profil";
|
||
#endif
|
||
#if defined (SYS_plock)
|
||
syscall_table[SYS_plock] = "plock";
|
||
#endif
|
||
#if defined (SYS_setgid)
|
||
syscall_table[SYS_setgid] = "setgid";
|
||
#endif
|
||
#if defined (SYS_getgid)
|
||
syscall_table[SYS_getgid] = "getgid";
|
||
#endif
|
||
#if defined (SYS_signal)
|
||
syscall_table[SYS_signal] = "signal";
|
||
#endif
|
||
#if defined (SYS_msgsys)
|
||
syscall_table[SYS_msgsys] = "msgsys";
|
||
#endif
|
||
#if defined (SYS_sys3b)
|
||
syscall_table[SYS_sys3b] = "sys3b";
|
||
#endif
|
||
#if defined (SYS_acct)
|
||
syscall_table[SYS_acct] = "acct";
|
||
#endif
|
||
#if defined (SYS_shmsys)
|
||
syscall_table[SYS_shmsys] = "shmsys";
|
||
#endif
|
||
#if defined (SYS_semsys)
|
||
syscall_table[SYS_semsys] = "semsys";
|
||
#endif
|
||
#if defined (SYS_ioctl)
|
||
syscall_table[SYS_ioctl] = "ioctl";
|
||
#endif
|
||
#if defined (SYS_uadmin)
|
||
syscall_table[SYS_uadmin] = "uadmin";
|
||
#endif
|
||
#if defined (SYS_utssys)
|
||
syscall_table[SYS_utssys] = "utssys";
|
||
#endif
|
||
#if defined (SYS_fsync)
|
||
syscall_table[SYS_fsync] = "fsync";
|
||
#endif
|
||
#if defined (SYS_umask)
|
||
syscall_table[SYS_umask] = "umask";
|
||
#endif
|
||
#if defined (SYS_chroot)
|
||
syscall_table[SYS_chroot] = "chroot";
|
||
#endif
|
||
#if defined (SYS_fcntl)
|
||
syscall_table[SYS_fcntl] = "fcntl";
|
||
#endif
|
||
#if defined (SYS_ulimit)
|
||
syscall_table[SYS_ulimit] = "ulimit";
|
||
#endif
|
||
#if defined (SYS_rfsys)
|
||
syscall_table[SYS_rfsys] = "rfsys";
|
||
#endif
|
||
#if defined (SYS_rmdir)
|
||
syscall_table[SYS_rmdir] = "rmdir";
|
||
#endif
|
||
#if defined (SYS_mkdir)
|
||
syscall_table[SYS_mkdir] = "mkdir";
|
||
#endif
|
||
#if defined (SYS_getdents)
|
||
syscall_table[SYS_getdents] = "getdents";
|
||
#endif
|
||
#if defined (SYS_sysfs)
|
||
syscall_table[SYS_sysfs] = "sysfs";
|
||
#endif
|
||
#if defined (SYS_getmsg)
|
||
syscall_table[SYS_getmsg] = "getmsg";
|
||
#endif
|
||
#if defined (SYS_putmsg)
|
||
syscall_table[SYS_putmsg] = "putmsg";
|
||
#endif
|
||
#if defined (SYS_poll)
|
||
syscall_table[SYS_poll] = "poll";
|
||
#endif
|
||
#if defined (SYS_lstat)
|
||
syscall_table[SYS_lstat] = "lstat";
|
||
#endif
|
||
#if defined (SYS_symlink)
|
||
syscall_table[SYS_symlink] = "symlink";
|
||
#endif
|
||
#if defined (SYS_readlink)
|
||
syscall_table[SYS_readlink] = "readlink";
|
||
#endif
|
||
#if defined (SYS_setgroups)
|
||
syscall_table[SYS_setgroups] = "setgroups";
|
||
#endif
|
||
#if defined (SYS_getgroups)
|
||
syscall_table[SYS_getgroups] = "getgroups";
|
||
#endif
|
||
#if defined (SYS_fchmod)
|
||
syscall_table[SYS_fchmod] = "fchmod";
|
||
#endif
|
||
#if defined (SYS_fchown)
|
||
syscall_table[SYS_fchown] = "fchown";
|
||
#endif
|
||
#if defined (SYS_sigprocmask)
|
||
syscall_table[SYS_sigprocmask] = "sigprocmask";
|
||
#endif
|
||
#if defined (SYS_sigsuspend)
|
||
syscall_table[SYS_sigsuspend] = "sigsuspend";
|
||
#endif
|
||
#if defined (SYS_sigaltstack)
|
||
syscall_table[SYS_sigaltstack] = "sigaltstack";
|
||
#endif
|
||
#if defined (SYS_sigaction)
|
||
syscall_table[SYS_sigaction] = "sigaction";
|
||
#endif
|
||
#if defined (SYS_sigpending)
|
||
syscall_table[SYS_sigpending] = "sigpending";
|
||
#endif
|
||
#if defined (SYS_context)
|
||
syscall_table[SYS_context] = "context";
|
||
#endif
|
||
#if defined (SYS_evsys)
|
||
syscall_table[SYS_evsys] = "evsys";
|
||
#endif
|
||
#if defined (SYS_evtrapret)
|
||
syscall_table[SYS_evtrapret] = "evtrapret";
|
||
#endif
|
||
#if defined (SYS_statvfs)
|
||
syscall_table[SYS_statvfs] = "statvfs";
|
||
#endif
|
||
#if defined (SYS_fstatvfs)
|
||
syscall_table[SYS_fstatvfs] = "fstatvfs";
|
||
#endif
|
||
#if defined (SYS_nfssys)
|
||
syscall_table[SYS_nfssys] = "nfssys";
|
||
#endif
|
||
#if defined (SYS_waitsys)
|
||
syscall_table[SYS_waitsys] = "waitsys";
|
||
#endif
|
||
#if defined (SYS_sigsendsys)
|
||
syscall_table[SYS_sigsendsys] = "sigsendsys";
|
||
#endif
|
||
#if defined (SYS_hrtsys)
|
||
syscall_table[SYS_hrtsys] = "hrtsys";
|
||
#endif
|
||
#if defined (SYS_acancel)
|
||
syscall_table[SYS_acancel] = "acancel";
|
||
#endif
|
||
#if defined (SYS_async)
|
||
syscall_table[SYS_async] = "async";
|
||
#endif
|
||
#if defined (SYS_priocntlsys)
|
||
syscall_table[SYS_priocntlsys] = "priocntlsys";
|
||
#endif
|
||
#if defined (SYS_pathconf)
|
||
syscall_table[SYS_pathconf] = "pathconf";
|
||
#endif
|
||
#if defined (SYS_mincore)
|
||
syscall_table[SYS_mincore] = "mincore";
|
||
#endif
|
||
#if defined (SYS_mmap)
|
||
syscall_table[SYS_mmap] = "mmap";
|
||
#endif
|
||
#if defined (SYS_mprotect)
|
||
syscall_table[SYS_mprotect] = "mprotect";
|
||
#endif
|
||
#if defined (SYS_munmap)
|
||
syscall_table[SYS_munmap] = "munmap";
|
||
#endif
|
||
#if defined (SYS_fpathconf)
|
||
syscall_table[SYS_fpathconf] = "fpathconf";
|
||
#endif
|
||
#if defined (SYS_vfork)
|
||
syscall_table[SYS_vfork] = "vfork";
|
||
#endif
|
||
#if defined (SYS_fchdir)
|
||
syscall_table[SYS_fchdir] = "fchdir";
|
||
#endif
|
||
#if defined (SYS_readv)
|
||
syscall_table[SYS_readv] = "readv";
|
||
#endif
|
||
#if defined (SYS_writev)
|
||
syscall_table[SYS_writev] = "writev";
|
||
#endif
|
||
#if defined (SYS_xstat)
|
||
syscall_table[SYS_xstat] = "xstat";
|
||
#endif
|
||
#if defined (SYS_lxstat)
|
||
syscall_table[SYS_lxstat] = "lxstat";
|
||
#endif
|
||
#if defined (SYS_fxstat)
|
||
syscall_table[SYS_fxstat] = "fxstat";
|
||
#endif
|
||
#if defined (SYS_xmknod)
|
||
syscall_table[SYS_xmknod] = "xmknod";
|
||
#endif
|
||
#if defined (SYS_clocal)
|
||
syscall_table[SYS_clocal] = "clocal";
|
||
#endif
|
||
#if defined (SYS_setrlimit)
|
||
syscall_table[SYS_setrlimit] = "setrlimit";
|
||
#endif
|
||
#if defined (SYS_getrlimit)
|
||
syscall_table[SYS_getrlimit] = "getrlimit";
|
||
#endif
|
||
#if defined (SYS_lchown)
|
||
syscall_table[SYS_lchown] = "lchown";
|
||
#endif
|
||
#if defined (SYS_memcntl)
|
||
syscall_table[SYS_memcntl] = "memcntl";
|
||
#endif
|
||
#if defined (SYS_getpmsg)
|
||
syscall_table[SYS_getpmsg] = "getpmsg";
|
||
#endif
|
||
#if defined (SYS_putpmsg)
|
||
syscall_table[SYS_putpmsg] = "putpmsg";
|
||
#endif
|
||
#if defined (SYS_rename)
|
||
syscall_table[SYS_rename] = "rename";
|
||
#endif
|
||
#if defined (SYS_uname)
|
||
syscall_table[SYS_uname] = "uname";
|
||
#endif
|
||
#if defined (SYS_setegid)
|
||
syscall_table[SYS_setegid] = "setegid";
|
||
#endif
|
||
#if defined (SYS_sysconfig)
|
||
syscall_table[SYS_sysconfig] = "sysconfig";
|
||
#endif
|
||
#if defined (SYS_adjtime)
|
||
syscall_table[SYS_adjtime] = "adjtime";
|
||
#endif
|
||
#if defined (SYS_systeminfo)
|
||
syscall_table[SYS_systeminfo] = "systeminfo";
|
||
#endif
|
||
#if defined (SYS_seteuid)
|
||
syscall_table[SYS_seteuid] = "seteuid";
|
||
#endif
|
||
#if defined (SYS_sproc)
|
||
syscall_table[SYS_sproc] = "sproc";
|
||
#endif
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
procfs_kill_inferior - kill any currently inferior
|
||
|
||
SYNOPSIS
|
||
|
||
void procfs_kill_inferior (void)
|
||
|
||
DESCRIPTION
|
||
|
||
Kill any current inferior.
|
||
|
||
NOTES
|
||
|
||
Kills even attached inferiors. Presumably the user has already
|
||
been prompted that the inferior is an attached one rather than
|
||
one started by gdb. (FIXME?)
|
||
|
||
*/
|
||
|
||
static void
|
||
procfs_kill_inferior ()
|
||
{
|
||
target_mourn_inferior ();
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
unconditionally_kill_inferior - terminate the inferior
|
||
|
||
SYNOPSIS
|
||
|
||
static void unconditionally_kill_inferior (struct procinfo *)
|
||
|
||
DESCRIPTION
|
||
|
||
Kill the specified inferior.
|
||
|
||
NOTE
|
||
|
||
A possibly useful enhancement would be to first try sending
|
||
the inferior a terminate signal, politely asking it to commit
|
||
suicide, before we murder it (we could call that
|
||
politely_kill_inferior()).
|
||
|
||
*/
|
||
|
||
static void
|
||
unconditionally_kill_inferior (pi)
|
||
struct procinfo *pi;
|
||
{
|
||
int signo;
|
||
int ppid;
|
||
|
||
ppid = pi->prstatus.pr_ppid;
|
||
|
||
signo = SIGKILL;
|
||
|
||
#ifdef PROCFS_NEED_PIOCSSIG_FOR_KILL
|
||
/* Alpha OSF/1 procfs needs a PIOCSSIG call with a SIGKILL signal
|
||
to kill the inferior, otherwise it might remain stopped with a
|
||
pending SIGKILL.
|
||
We do not check the result of the PIOCSSIG, the inferior might have
|
||
died already. */
|
||
{
|
||
struct siginfo newsiginfo;
|
||
|
||
memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
|
||
newsiginfo.si_signo = signo;
|
||
newsiginfo.si_code = 0;
|
||
newsiginfo.si_errno = 0;
|
||
newsiginfo.si_pid = getpid ();
|
||
newsiginfo.si_uid = getuid ();
|
||
ioctl (pi->fd, PIOCSSIG, &newsiginfo);
|
||
}
|
||
#else
|
||
ioctl (pi->fd, PIOCKILL, &signo);
|
||
#endif
|
||
|
||
close_proc_file (pi);
|
||
|
||
/* Only wait() for our direct children. Our grandchildren zombies are killed
|
||
by the death of their parents. */
|
||
|
||
if (ppid == getpid())
|
||
wait ((int *) 0);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
procfs_xfer_memory -- copy data to or from inferior memory space
|
||
|
||
SYNOPSIS
|
||
|
||
int procfs_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
|
||
int dowrite, struct target_ops target)
|
||
|
||
DESCRIPTION
|
||
|
||
Copy LEN bytes to/from inferior's memory starting at MEMADDR
|
||
from/to debugger memory starting at MYADDR. Copy from inferior
|
||
if DOWRITE is zero or to inferior if DOWRITE is nonzero.
|
||
|
||
Returns the length copied, which is either the LEN argument or
|
||
zero. This xfer function does not do partial moves, since procfs_ops
|
||
doesn't allow memory operations to cross below us in the target stack
|
||
anyway.
|
||
|
||
NOTES
|
||
|
||
The /proc interface makes this an almost trivial task.
|
||
*/
|
||
|
||
static int
|
||
procfs_xfer_memory (memaddr, myaddr, len, dowrite, target)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int dowrite;
|
||
struct target_ops *target; /* ignored */
|
||
{
|
||
int nbytes = 0;
|
||
struct procinfo *pi;
|
||
|
||
pi = current_procinfo;
|
||
|
||
if (lseek(pi->fd, (off_t) memaddr, 0) == (off_t) memaddr)
|
||
{
|
||
if (dowrite)
|
||
{
|
||
nbytes = write (pi->fd, myaddr, len);
|
||
}
|
||
else
|
||
{
|
||
nbytes = read (pi->fd, myaddr, len);
|
||
}
|
||
if (nbytes < 0)
|
||
{
|
||
nbytes = 0;
|
||
}
|
||
}
|
||
return (nbytes);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
procfs_store_registers -- copy register values back to inferior
|
||
|
||
SYNOPSIS
|
||
|
||
void procfs_store_registers (int regno)
|
||
|
||
DESCRIPTION
|
||
|
||
Store our current register values back into the inferior. If
|
||
REGNO is -1 then store all the register, otherwise store just
|
||
the value specified by REGNO.
|
||
|
||
NOTES
|
||
|
||
If we are storing only a single register, we first have to get all
|
||
the current values from the process, overwrite the desired register
|
||
in the gregset with the one we want from gdb's registers, and then
|
||
send the whole set back to the process. For writing all the
|
||
registers, all we have to do is generate the gregset and send it to
|
||
the process.
|
||
|
||
Also note that the process has to be stopped on an event of interest
|
||
for this to work, which basically means that it has to have been
|
||
run under the control of one of the other /proc ioctl calls and not
|
||
ptrace. Since we don't use ptrace anyway, we don't worry about this
|
||
fine point, but it is worth noting for future reference.
|
||
|
||
Gdb is confused about what this function is supposed to return.
|
||
Some versions return a value, others return nothing. Some are
|
||
declared to return a value and actually return nothing. Gdb ignores
|
||
anything returned. (FIXME)
|
||
|
||
*/
|
||
|
||
static void
|
||
procfs_store_registers (regno)
|
||
int regno;
|
||
{
|
||
struct procinfo *pi;
|
||
|
||
pi = current_procinfo;
|
||
|
||
if (regno != -1)
|
||
{
|
||
ioctl (pi->fd, PIOCGREG, &pi->gregset);
|
||
}
|
||
fill_gregset (&pi->gregset, regno);
|
||
ioctl (pi->fd, PIOCSREG, &pi->gregset);
|
||
|
||
#if defined (FP0_REGNUM)
|
||
|
||
/* Now repeat everything using the floating point register set, if the
|
||
target has floating point hardware. Since we ignore the returned value,
|
||
we'll never know whether it worked or not anyway. */
|
||
|
||
if (regno != -1)
|
||
{
|
||
ioctl (pi->fd, PIOCGFPREG, &pi->fpregset);
|
||
}
|
||
fill_fpregset (&pi->fpregset, regno);
|
||
ioctl (pi->fd, PIOCSFPREG, &pi->fpregset);
|
||
|
||
#endif /* FP0_REGNUM */
|
||
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
create_procinfo - initialize access to a /proc entry
|
||
|
||
SYNOPSIS
|
||
|
||
struct procinfo * create_procinfo (int pid)
|
||
|
||
DESCRIPTION
|
||
|
||
Allocate a procinfo structure, open the /proc file and then set up the
|
||
set of signals and faults that are to be traced. Returns a pointer to
|
||
the new procinfo structure.
|
||
|
||
NOTES
|
||
|
||
If proc_init_failed ever gets called, control returns to the command
|
||
processing loop via the standard error handling code.
|
||
|
||
*/
|
||
|
||
static struct procinfo *
|
||
create_procinfo (pid)
|
||
int pid;
|
||
{
|
||
struct procinfo *pi;
|
||
|
||
pi = find_procinfo (pid, 1);
|
||
if (pi != NULL)
|
||
return pi; /* All done! It already exists */
|
||
|
||
pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
|
||
|
||
if (!open_proc_file (pid, pi, O_RDWR))
|
||
proc_init_failed (pi, "can't open process file");
|
||
|
||
/* Add new process to process info list */
|
||
|
||
pi->next = procinfo_list;
|
||
procinfo_list = pi;
|
||
|
||
add_fd (pi); /* Add to list for poll/select */
|
||
|
||
memset ((char *) &pi->prrun, 0, sizeof (pi->prrun));
|
||
prfillset (&pi->prrun.pr_trace);
|
||
procfs_notice_signals (pid);
|
||
prfillset (&pi->prrun.pr_fault);
|
||
prdelset (&pi->prrun.pr_fault, FLTPAGE);
|
||
|
||
#ifdef PROCFS_DONT_TRACE_FAULTS
|
||
premptyset (&pi->prrun.pr_fault);
|
||
#endif
|
||
|
||
if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
|
||
proc_init_failed (pi, "PIOCWSTOP failed");
|
||
|
||
if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault) < 0)
|
||
proc_init_failed (pi, "PIOCSFAULT failed");
|
||
|
||
return pi;
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
procfs_init_inferior - initialize target vector and access to a
|
||
/proc entry
|
||
|
||
SYNOPSIS
|
||
|
||
void procfs_init_inferior (int pid)
|
||
|
||
DESCRIPTION
|
||
|
||
When gdb starts an inferior, this function is called in the parent
|
||
process immediately after the fork. It waits for the child to stop
|
||
on the return from the exec system call (the child itself takes care
|
||
of ensuring that this is set up), then sets up the set of signals
|
||
and faults that are to be traced.
|
||
|
||
NOTES
|
||
|
||
If proc_init_failed ever gets called, control returns to the command
|
||
processing loop via the standard error handling code.
|
||
|
||
*/
|
||
|
||
static void
|
||
procfs_init_inferior (pid)
|
||
int pid;
|
||
{
|
||
push_target (&procfs_ops);
|
||
|
||
create_procinfo (pid);
|
||
add_thread (pid); /* Setup initial thread */
|
||
|
||
#ifdef START_INFERIOR_TRAPS_EXPECTED
|
||
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
|
||
#else
|
||
/* One trap to exec the shell, one to exec the program being debugged. */
|
||
startup_inferior (2);
|
||
#endif
|
||
}
|
||
|
||
/*
|
||
|
||
GLOBAL FUNCTION
|
||
|
||
procfs_notice_signals
|
||
|
||
SYNOPSIS
|
||
|
||
static void procfs_notice_signals (int pid);
|
||
|
||
DESCRIPTION
|
||
|
||
When the user changes the state of gdb's signal handling via the
|
||
"handle" command, this function gets called to see if any change
|
||
in the /proc interface is required. It is also called internally
|
||
by other /proc interface functions to initialize the state of
|
||
the traced signal set.
|
||
|
||
One thing it does is that signals for which the state is "nostop",
|
||
"noprint", and "pass", have their trace bits reset in the pr_trace
|
||
field, so that they are no longer traced. This allows them to be
|
||
delivered directly to the inferior without the debugger ever being
|
||
involved.
|
||
*/
|
||
|
||
static void
|
||
procfs_notice_signals (pid)
|
||
int pid;
|
||
{
|
||
int signo;
|
||
struct procinfo *pi;
|
||
|
||
pi = find_procinfo (pid, 0);
|
||
|
||
for (signo = 0; signo < NSIG; signo++)
|
||
{
|
||
if (signal_stop_state (target_signal_from_host (signo)) == 0 &&
|
||
signal_print_state (target_signal_from_host (signo)) == 0 &&
|
||
signal_pass_state (target_signal_from_host (signo)) == 1)
|
||
{
|
||
prdelset (&pi->prrun.pr_trace, signo);
|
||
}
|
||
else
|
||
{
|
||
praddset (&pi->prrun.pr_trace, signo);
|
||
}
|
||
}
|
||
if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
|
||
{
|
||
print_sys_errmsg ("PIOCSTRACE failed", errno);
|
||
}
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
proc_set_exec_trap -- arrange for exec'd child to halt at startup
|
||
|
||
SYNOPSIS
|
||
|
||
void proc_set_exec_trap (void)
|
||
|
||
DESCRIPTION
|
||
|
||
This function is called in the child process when starting up
|
||
an inferior, prior to doing the exec of the actual inferior.
|
||
It sets the child process's exitset to make exit from the exec
|
||
system call an event of interest to stop on, and then simply
|
||
returns. The child does the exec, the system call returns, and
|
||
the child stops at the first instruction, ready for the gdb
|
||
parent process to take control of it.
|
||
|
||
NOTE
|
||
|
||
We need to use all local variables since the child may be sharing
|
||
it's data space with the parent, if vfork was used rather than
|
||
fork.
|
||
|
||
Also note that we want to turn off the inherit-on-fork flag in
|
||
the child process so that any grand-children start with all
|
||
tracing flags cleared.
|
||
*/
|
||
|
||
static void
|
||
proc_set_exec_trap ()
|
||
{
|
||
sysset_t exitset;
|
||
sysset_t entryset;
|
||
auto char procname[32];
|
||
int fd;
|
||
|
||
sprintf (procname, PROC_NAME_FMT, getpid ());
|
||
if ((fd = open (procname, O_RDWR)) < 0)
|
||
{
|
||
perror (procname);
|
||
gdb_flush (gdb_stderr);
|
||
_exit (127);
|
||
}
|
||
premptyset (&exitset);
|
||
premptyset (&entryset);
|
||
|
||
#ifdef PIOCSSPCACT
|
||
/* Under Alpha OSF/1 we have to use a PIOCSSPCACT ioctl to trace
|
||
exits from exec system calls because of the user level loader. */
|
||
{
|
||
int prfs_flags;
|
||
|
||
if (ioctl (fd, PIOCGSPCACT, &prfs_flags) < 0)
|
||
{
|
||
perror (procname);
|
||
gdb_flush (gdb_stderr);
|
||
_exit (127);
|
||
}
|
||
prfs_flags |= PRFS_STOPEXEC;
|
||
if (ioctl (fd, PIOCSSPCACT, &prfs_flags) < 0)
|
||
{
|
||
perror (procname);
|
||
gdb_flush (gdb_stderr);
|
||
_exit (127);
|
||
}
|
||
}
|
||
#else
|
||
/* GW: Rationale...
|
||
Not all systems with /proc have all the exec* syscalls with the same
|
||
names. On the SGI, for example, there is no SYS_exec, but there
|
||
*is* a SYS_execv. So, we try to account for that. */
|
||
|
||
#ifdef SYS_exec
|
||
praddset (&exitset, SYS_exec);
|
||
#endif
|
||
#ifdef SYS_execve
|
||
praddset (&exitset, SYS_execve);
|
||
#endif
|
||
#ifdef SYS_execv
|
||
praddset (&exitset, SYS_execv);
|
||
#endif
|
||
|
||
if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
|
||
{
|
||
perror (procname);
|
||
gdb_flush (gdb_stderr);
|
||
_exit (127);
|
||
}
|
||
#endif
|
||
|
||
praddset (&entryset, SYS_exit);
|
||
|
||
if (ioctl (fd, PIOCSENTRY, &entryset) < 0)
|
||
{
|
||
perror (procname);
|
||
gdb_flush (gdb_stderr);
|
||
_exit (126);
|
||
}
|
||
|
||
/* Turn off inherit-on-fork flag so that all grand-children of gdb
|
||
start with tracing flags cleared. */
|
||
|
||
#if defined (PIOCRESET) /* New method */
|
||
{
|
||
long pr_flags;
|
||
pr_flags = PR_FORK;
|
||
ioctl (fd, PIOCRESET, &pr_flags);
|
||
}
|
||
#else
|
||
#if defined (PIOCRFORK) /* Original method */
|
||
ioctl (fd, PIOCRFORK, NULL);
|
||
#endif
|
||
#endif
|
||
|
||
/* Turn on run-on-last-close flag so that this process will not hang
|
||
if GDB goes away for some reason. */
|
||
|
||
#if defined (PIOCSET) /* New method */
|
||
{
|
||
long pr_flags;
|
||
pr_flags = PR_RLC;
|
||
(void) ioctl (fd, PIOCSET, &pr_flags);
|
||
}
|
||
#else
|
||
#if defined (PIOCSRLC) /* Original method */
|
||
(void) ioctl (fd, PIOCSRLC, 0);
|
||
#endif
|
||
#endif
|
||
}
|
||
|
||
/*
|
||
|
||
GLOBAL FUNCTION
|
||
|
||
proc_iterate_over_mappings -- call function for every mapped space
|
||
|
||
SYNOPSIS
|
||
|
||
int proc_iterate_over_mappings (int (*func)())
|
||
|
||
DESCRIPTION
|
||
|
||
Given a pointer to a function, call that function for every
|
||
mapped address space, passing it an open file descriptor for
|
||
the file corresponding to that mapped address space (if any)
|
||
and the base address of the mapped space. Quit when we hit
|
||
the end of the mappings or the function returns nonzero.
|
||
*/
|
||
|
||
int
|
||
proc_iterate_over_mappings (func)
|
||
int (*func) PARAMS ((int, CORE_ADDR));
|
||
{
|
||
int nmap;
|
||
int fd;
|
||
int funcstat = 0;
|
||
struct prmap *prmaps;
|
||
struct prmap *prmap;
|
||
struct procinfo *pi;
|
||
|
||
pi = current_procinfo;
|
||
|
||
if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
|
||
{
|
||
prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
|
||
if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
|
||
{
|
||
for (prmap = prmaps; prmap -> pr_size && funcstat == 0; ++prmap)
|
||
{
|
||
fd = proc_address_to_fd (pi, (CORE_ADDR) prmap -> pr_vaddr, 0);
|
||
funcstat = (*func) (fd, (CORE_ADDR) prmap -> pr_vaddr);
|
||
close (fd);
|
||
}
|
||
}
|
||
}
|
||
return (funcstat);
|
||
}
|
||
|
||
#if 0 /* Currently unused */
|
||
/*
|
||
|
||
GLOBAL FUNCTION
|
||
|
||
proc_base_address -- find base address for segment containing address
|
||
|
||
SYNOPSIS
|
||
|
||
CORE_ADDR proc_base_address (CORE_ADDR addr)
|
||
|
||
DESCRIPTION
|
||
|
||
Given an address of a location in the inferior, find and return
|
||
the base address of the mapped segment containing that address.
|
||
|
||
This is used for example, by the shared library support code,
|
||
where we have the pc value for some location in the shared library
|
||
where we are stopped, and need to know the base address of the
|
||
segment containing that address.
|
||
*/
|
||
|
||
CORE_ADDR
|
||
proc_base_address (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
int nmap;
|
||
struct prmap *prmaps;
|
||
struct prmap *prmap;
|
||
CORE_ADDR baseaddr = 0;
|
||
struct procinfo *pi;
|
||
|
||
pi = current_procinfo;
|
||
|
||
if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
|
||
{
|
||
prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
|
||
if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
|
||
{
|
||
for (prmap = prmaps; prmap -> pr_size; ++prmap)
|
||
{
|
||
if ((prmap -> pr_vaddr <= (caddr_t) addr) &&
|
||
(prmap -> pr_vaddr + prmap -> pr_size > (caddr_t) addr))
|
||
{
|
||
baseaddr = (CORE_ADDR) prmap -> pr_vaddr;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return (baseaddr);
|
||
}
|
||
|
||
#endif /* 0 */
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
proc_address_to_fd -- return open fd for file mapped to address
|
||
|
||
SYNOPSIS
|
||
|
||
int proc_address_to_fd (struct procinfo *pi, CORE_ADDR addr, complain)
|
||
|
||
DESCRIPTION
|
||
|
||
Given an address in the current inferior's address space, use the
|
||
/proc interface to find an open file descriptor for the file that
|
||
this address was mapped in from. Return -1 if there is no current
|
||
inferior. Print a warning message if there is an inferior but
|
||
the address corresponds to no file (IE a bogus address).
|
||
|
||
*/
|
||
|
||
static int
|
||
proc_address_to_fd (pi, addr, complain)
|
||
struct procinfo *pi;
|
||
CORE_ADDR addr;
|
||
int complain;
|
||
{
|
||
int fd = -1;
|
||
|
||
if ((fd = ioctl (pi->fd, PIOCOPENM, (caddr_t *) &addr)) < 0)
|
||
{
|
||
if (complain)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
warning ("can't find mapped file for address 0x%x", addr);
|
||
}
|
||
}
|
||
return (fd);
|
||
}
|
||
|
||
|
||
/* Attach to process PID, then initialize for debugging it
|
||
and wait for the trace-trap that results from attaching. */
|
||
|
||
static void
|
||
procfs_attach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char *exec_file;
|
||
int pid;
|
||
|
||
if (!args)
|
||
error_no_arg ("process-id to attach");
|
||
|
||
pid = atoi (args);
|
||
|
||
if (pid == getpid()) /* Trying to masturbate? */
|
||
error ("I refuse to debug myself!");
|
||
|
||
if (from_tty)
|
||
{
|
||
exec_file = (char *) get_exec_file (0);
|
||
|
||
if (exec_file)
|
||
printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, target_pid_to_str (pid));
|
||
else
|
||
printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
|
||
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
|
||
do_attach (pid);
|
||
inferior_pid = pid;
|
||
push_target (&procfs_ops);
|
||
}
|
||
|
||
|
||
/* Take a program previously attached to and detaches it.
|
||
The program resumes execution and will no longer stop
|
||
on signals, etc. We'd better not have left any breakpoints
|
||
in the program or it'll die when it hits one. For this
|
||
to work, it may be necessary for the process to have been
|
||
previously attached. It *might* work if the program was
|
||
started via the normal ptrace (PTRACE_TRACEME). */
|
||
|
||
static void
|
||
procfs_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
int siggnal = 0;
|
||
|
||
if (from_tty)
|
||
{
|
||
char *exec_file = get_exec_file (0);
|
||
if (exec_file == 0)
|
||
exec_file = "";
|
||
printf_unfiltered ("Detaching from program: %s %s\n",
|
||
exec_file, target_pid_to_str (inferior_pid));
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
if (args)
|
||
siggnal = atoi (args);
|
||
|
||
do_detach (siggnal);
|
||
inferior_pid = 0;
|
||
unpush_target (&procfs_ops); /* Pop out of handling an inferior */
|
||
}
|
||
|
||
/* Get ready to modify the registers array. On machines which store
|
||
individual registers, this doesn't need to do anything. On machines
|
||
which store all the registers in one fell swoop, this makes sure
|
||
that registers contains all the registers from the program being
|
||
debugged. */
|
||
|
||
static void
|
||
procfs_prepare_to_store ()
|
||
{
|
||
#ifdef CHILD_PREPARE_TO_STORE
|
||
CHILD_PREPARE_TO_STORE ();
|
||
#endif
|
||
}
|
||
|
||
/* Print status information about what we're accessing. */
|
||
|
||
static void
|
||
procfs_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
printf_unfiltered ("\tUsing the running image of %s %s via /proc.\n",
|
||
attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
procfs_open (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
error ("Use the \"run\" command to start a Unix child process.");
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
do_attach -- attach to an already existing process
|
||
|
||
SYNOPSIS
|
||
|
||
int do_attach (int pid)
|
||
|
||
DESCRIPTION
|
||
|
||
Attach to an already existing process with the specified process
|
||
id. If the process is not already stopped, query whether to
|
||
stop it or not.
|
||
|
||
NOTES
|
||
|
||
The option of stopping at attach time is specific to the /proc
|
||
versions of gdb. Versions using ptrace force the attachee
|
||
to stop. (I have changed this version to do so, too. All you
|
||
have to do is "continue" to make it go on. -- gnu@cygnus.com)
|
||
|
||
*/
|
||
|
||
static int
|
||
do_attach (pid)
|
||
int pid;
|
||
{
|
||
int result;
|
||
struct procinfo *pi;
|
||
|
||
pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
|
||
|
||
if (!open_proc_file (pid, pi, O_RDWR))
|
||
{
|
||
free (pi);
|
||
perror_with_name (pi->pathname);
|
||
/* NOTREACHED */
|
||
}
|
||
|
||
/* Add new process to process info list */
|
||
|
||
pi->next = procinfo_list;
|
||
procinfo_list = pi;
|
||
|
||
add_fd (pi); /* Add to list for poll/select */
|
||
|
||
/* Get current status of process and if it is not already stopped,
|
||
then stop it. Remember whether or not it was stopped when we first
|
||
examined it. */
|
||
|
||
if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
close_proc_file (pi);
|
||
error ("PIOCSTATUS failed");
|
||
}
|
||
if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
|
||
{
|
||
pi->was_stopped = 1;
|
||
}
|
||
else
|
||
{
|
||
pi->was_stopped = 0;
|
||
if (1 || query ("Process is currently running, stop it? "))
|
||
{
|
||
/* Make it run again when we close it. */
|
||
#if defined (PIOCSET) /* New method */
|
||
{
|
||
long pr_flags;
|
||
pr_flags = PR_RLC;
|
||
result = ioctl (pi->fd, PIOCSET, &pr_flags);
|
||
}
|
||
#else
|
||
#if defined (PIOCSRLC) /* Original method */
|
||
result = ioctl (pi->fd, PIOCSRLC, 0);
|
||
#endif
|
||
#endif
|
||
if (result < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
close_proc_file (pi);
|
||
error ("PIOCSRLC or PIOCSET failed");
|
||
}
|
||
if (ioctl (pi->fd, PIOCSTOP, &pi->prstatus) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
close_proc_file (pi);
|
||
error ("PIOCSTOP failed");
|
||
}
|
||
pi->nopass_next_sigstop = 1;
|
||
}
|
||
else
|
||
{
|
||
printf_unfiltered ("Ok, gdb will wait for %s to stop.\n", target_pid_to_str (pid));
|
||
}
|
||
}
|
||
|
||
/* Remember some things about the inferior that we will, or might, change
|
||
so that we can restore them when we detach. */
|
||
|
||
ioctl (pi->fd, PIOCGTRACE, &pi->saved_trace);
|
||
ioctl (pi->fd, PIOCGHOLD, &pi->saved_sighold);
|
||
ioctl (pi->fd, PIOCGFAULT, &pi->saved_fltset);
|
||
ioctl (pi->fd, PIOCGENTRY, &pi->saved_entryset);
|
||
ioctl (pi->fd, PIOCGEXIT, &pi->saved_exitset);
|
||
|
||
/* Set up trace and fault sets, as gdb expects them. */
|
||
|
||
memset (&pi->prrun, 0, sizeof (pi->prrun));
|
||
prfillset (&pi->prrun.pr_trace);
|
||
procfs_notice_signals (pid);
|
||
prfillset (&pi->prrun.pr_fault);
|
||
prdelset (&pi->prrun.pr_fault, FLTPAGE);
|
||
|
||
#ifdef PROCFS_DONT_TRACE_FAULTS
|
||
premptyset (&pi->prrun.pr_fault);
|
||
#endif
|
||
|
||
if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault))
|
||
{
|
||
print_sys_errmsg ("PIOCSFAULT failed", errno);
|
||
}
|
||
if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
|
||
{
|
||
print_sys_errmsg ("PIOCSTRACE failed", errno);
|
||
}
|
||
attach_flag = 1;
|
||
return (pid);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
do_detach -- detach from an attached-to process
|
||
|
||
SYNOPSIS
|
||
|
||
void do_detach (int signal)
|
||
|
||
DESCRIPTION
|
||
|
||
Detach from the current attachee.
|
||
|
||
If signal is non-zero, the attachee is started running again and sent
|
||
the specified signal.
|
||
|
||
If signal is zero and the attachee was not already stopped when we
|
||
attached to it, then we make it runnable again when we detach.
|
||
|
||
Otherwise, we query whether or not to make the attachee runnable
|
||
again, since we may simply want to leave it in the state it was in
|
||
when we attached.
|
||
|
||
We report any problems, but do not consider them errors, since we
|
||
MUST detach even if some things don't seem to go right. This may not
|
||
be the ideal situation. (FIXME).
|
||
*/
|
||
|
||
static void
|
||
do_detach (signal)
|
||
int signal;
|
||
{
|
||
int result;
|
||
struct procinfo *pi;
|
||
|
||
pi = current_procinfo;
|
||
|
||
if (signal)
|
||
{
|
||
set_proc_siginfo (pi, signal);
|
||
}
|
||
if (ioctl (pi->fd, PIOCSEXIT, &pi->saved_exitset) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCSEXIT failed.\n");
|
||
}
|
||
if (ioctl (pi->fd, PIOCSENTRY, &pi->saved_entryset) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCSENTRY failed.\n");
|
||
}
|
||
if (ioctl (pi->fd, PIOCSTRACE, &pi->saved_trace) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCSTRACE failed.\n");
|
||
}
|
||
if (ioctl (pi->fd, PIOCSHOLD, &pi->saved_sighold) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOSCHOLD failed.\n");
|
||
}
|
||
if (ioctl (pi->fd, PIOCSFAULT, &pi->saved_fltset) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCSFAULT failed.\n");
|
||
}
|
||
if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCSTATUS failed.\n");
|
||
}
|
||
else
|
||
{
|
||
if (signal || (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
|
||
{
|
||
if (signal || !pi->was_stopped ||
|
||
query ("Was stopped when attached, make it runnable again? "))
|
||
{
|
||
/* Clear any pending signal if we want to detach without
|
||
a signal. */
|
||
if (signal == 0)
|
||
set_proc_siginfo (pi, signal);
|
||
|
||
/* Clear any fault that might have stopped it. */
|
||
if (ioctl (pi->fd, PIOCCFAULT, 0))
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCCFAULT failed.\n");
|
||
}
|
||
|
||
/* Make it run again when we close it. */
|
||
#if defined (PIOCSET) /* New method */
|
||
{
|
||
long pr_flags;
|
||
pr_flags = PR_RLC;
|
||
result = ioctl (pi->fd, PIOCSET, &pr_flags);
|
||
}
|
||
#else
|
||
#if defined (PIOCSRLC) /* Original method */
|
||
result = ioctl (pi->fd, PIOCSRLC, 0);
|
||
#endif
|
||
#endif
|
||
if (result)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
printf_unfiltered ("PIOCSRLC or PIOCSET failed.\n");
|
||
}
|
||
}
|
||
}
|
||
}
|
||
close_proc_file (pi);
|
||
attach_flag = 0;
|
||
}
|
||
|
||
/* emulate wait() as much as possible.
|
||
Wait for child to do something. Return pid of child, or -1 in case
|
||
of error; store status in *OURSTATUS.
|
||
|
||
Not sure why we can't
|
||
just use wait(), but it seems to have problems when applied to a
|
||
process being controlled with the /proc interface.
|
||
|
||
We have a race problem here with no obvious solution. We need to let
|
||
the inferior run until it stops on an event of interest, which means
|
||
that we need to use the PIOCWSTOP ioctl. However, we cannot use this
|
||
ioctl if the process is already stopped on something that is not an
|
||
event of interest, or the call will hang indefinitely. Thus we first
|
||
use PIOCSTATUS to see if the process is not stopped. If not, then we
|
||
use PIOCWSTOP. But during the window between the two, if the process
|
||
stops for any reason that is not an event of interest (such as a job
|
||
control signal) then gdb will hang. One possible workaround is to set
|
||
an alarm to wake up every minute of so and check to see if the process
|
||
is still running, and if so, then reissue the PIOCWSTOP. But this is
|
||
a real kludge, so has not been implemented. FIXME: investigate
|
||
alternatives.
|
||
|
||
FIXME: Investigate why wait() seems to have problems with programs
|
||
being control by /proc routines. */
|
||
|
||
static int
|
||
procfs_wait (pid, ourstatus)
|
||
int pid;
|
||
struct target_waitstatus *ourstatus;
|
||
{
|
||
short what;
|
||
short why;
|
||
int statval = 0;
|
||
int checkerr = 0;
|
||
int rtnval = -1;
|
||
struct procinfo *pi;
|
||
|
||
if (pid != -1) /* Non-specific process? */
|
||
pi = NULL;
|
||
else
|
||
for (pi = procinfo_list; pi; pi = pi->next)
|
||
if (pi->had_event)
|
||
break;
|
||
|
||
if (!pi)
|
||
{
|
||
wait_again:
|
||
|
||
pi = wait_fd ();
|
||
}
|
||
|
||
if (pid != -1)
|
||
for (pi = procinfo_list; pi; pi = pi->next)
|
||
if (pi->pid == pid && pi->had_event)
|
||
break;
|
||
|
||
if (!pi && !checkerr)
|
||
goto wait_again;
|
||
|
||
if (!checkerr && !(pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
|
||
{
|
||
if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
|
||
{
|
||
checkerr++;
|
||
}
|
||
}
|
||
if (checkerr)
|
||
{
|
||
if (errno == ENOENT)
|
||
{
|
||
rtnval = wait (&statval);
|
||
if (rtnval != inferior_pid)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCWSTOP, wait failed, returned %d", rtnval);
|
||
/* NOTREACHED */
|
||
}
|
||
}
|
||
else
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCSTATUS or PIOCWSTOP failed.");
|
||
/* NOTREACHED */
|
||
}
|
||
}
|
||
else if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
|
||
{
|
||
rtnval = pi->prstatus.pr_pid;
|
||
why = pi->prstatus.pr_why;
|
||
what = pi->prstatus.pr_what;
|
||
|
||
switch (why)
|
||
{
|
||
case PR_SIGNALLED:
|
||
statval = (what << 8) | 0177;
|
||
break;
|
||
case PR_SYSENTRY:
|
||
if (what != SYS_exit)
|
||
error ("PR_SYSENTRY, unknown system call %d", what);
|
||
|
||
pi->prrun.pr_flags = PRCFAULT;
|
||
|
||
if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
|
||
perror_with_name (pi->pathname);
|
||
|
||
rtnval = wait (&statval);
|
||
|
||
break;
|
||
case PR_SYSEXIT:
|
||
switch (what)
|
||
{
|
||
#ifdef SYS_exec
|
||
case SYS_exec:
|
||
#endif
|
||
#ifdef SYS_execve
|
||
case SYS_execve:
|
||
#endif
|
||
#ifdef SYS_execv
|
||
case SYS_execv:
|
||
#endif
|
||
statval = (SIGTRAP << 8) | 0177;
|
||
break;
|
||
#ifdef SYS_sproc
|
||
case SYS_sproc:
|
||
/* We've just detected the completion of an sproc system call. Now we need to
|
||
setup a procinfo struct for this thread, and notify the thread system of the
|
||
new arrival. */
|
||
|
||
/* If sproc failed, then nothing interesting happened. Continue the process and
|
||
go back to sleep. */
|
||
|
||
if (pi->prstatus.pr_errno != 0)
|
||
{
|
||
pi->prrun.pr_flags &= PRSTEP;
|
||
pi->prrun.pr_flags |= PRCFAULT;
|
||
|
||
if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
|
||
perror_with_name (pi->pathname);
|
||
|
||
goto wait_again;
|
||
}
|
||
|
||
/* At this point, the new thread is stopped at it's first instruction, and
|
||
the parent is stopped at the exit from sproc. */
|
||
|
||
/* Notify the caller of the arrival of a new thread. */
|
||
create_procinfo (pi->prstatus.pr_rval1);
|
||
|
||
rtnval = pi->prstatus.pr_rval1;
|
||
statval = (SIGTRAP << 8) | 0177;
|
||
|
||
break;
|
||
case SYS_fork:
|
||
#ifdef SYS_vfork
|
||
case SYS_vfork:
|
||
#endif
|
||
/* At this point, we've detected the completion of a fork (or vfork) call in
|
||
our child. The grandchild is also stopped because we set inherit-on-fork
|
||
earlier. (Note that nobody has the grandchilds' /proc file open at this
|
||
point.) We will release the grandchild from the debugger by opening it's
|
||
/proc file and then closing it. Since run-on-last-close is set, the
|
||
grandchild continues on its' merry way. */
|
||
|
||
{
|
||
struct procinfo *pitemp;
|
||
|
||
pitemp = create_procinfo (pi->prstatus.pr_rval1);
|
||
if (pitemp)
|
||
close_proc_file (pitemp);
|
||
|
||
if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
|
||
perror_with_name (pi->pathname);
|
||
}
|
||
goto wait_again;
|
||
#endif /* SYS_sproc */
|
||
|
||
default:
|
||
error ("PIOCSTATUS (PR_SYSEXIT): Unknown system call %d", what);
|
||
}
|
||
break;
|
||
case PR_REQUESTED:
|
||
statval = (SIGSTOP << 8) | 0177;
|
||
break;
|
||
case PR_JOBCONTROL:
|
||
statval = (what << 8) | 0177;
|
||
break;
|
||
case PR_FAULTED:
|
||
switch (what)
|
||
{
|
||
#ifdef FLTWATCH
|
||
case FLTWATCH:
|
||
statval = (SIGTRAP << 8) | 0177;
|
||
break;
|
||
#endif
|
||
#ifdef FLTKWATCH
|
||
case FLTKWATCH:
|
||
statval = (SIGTRAP << 8) | 0177;
|
||
break;
|
||
#endif
|
||
#ifndef FAULTED_USE_SIGINFO
|
||
/* Irix, contrary to the documentation, fills in 0 for si_signo.
|
||
Solaris fills in si_signo. I'm not sure about others. */
|
||
case FLTPRIV:
|
||
case FLTILL:
|
||
statval = (SIGILL << 8) | 0177;
|
||
break;
|
||
case FLTBPT:
|
||
case FLTTRACE:
|
||
statval = (SIGTRAP << 8) | 0177;
|
||
break;
|
||
case FLTSTACK:
|
||
case FLTACCESS:
|
||
case FLTBOUNDS:
|
||
statval = (SIGSEGV << 8) | 0177;
|
||
break;
|
||
case FLTIOVF:
|
||
case FLTIZDIV:
|
||
case FLTFPE:
|
||
statval = (SIGFPE << 8) | 0177;
|
||
break;
|
||
case FLTPAGE: /* Recoverable page fault */
|
||
#endif /* not FAULTED_USE_SIGINFO */
|
||
default:
|
||
/* Use the signal which the kernel assigns. This is better than
|
||
trying to second-guess it from the fault. In fact, I suspect
|
||
that FLTACCESS can be either SIGSEGV or SIGBUS. */
|
||
statval = ((pi->prstatus.pr_info.si_signo) << 8) | 0177;
|
||
break;
|
||
}
|
||
break;
|
||
default:
|
||
error ("PIOCWSTOP, unknown why %d, what %d", why, what);
|
||
}
|
||
/* Stop all the other threads when any of them stops. */
|
||
|
||
{
|
||
struct procinfo *procinfo;
|
||
|
||
for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
|
||
{
|
||
if (!procinfo->had_event)
|
||
if (ioctl (procinfo->fd, PIOCSTOP, &procinfo->prstatus) < 0)
|
||
{
|
||
print_sys_errmsg (procinfo->pathname, errno);
|
||
error ("PIOCSTOP failed");
|
||
}
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x",
|
||
pi->prstatus.pr_flags);
|
||
}
|
||
|
||
store_waitstatus (ourstatus, statval);
|
||
|
||
if (rtnval == -1) /* No more children to wait for */
|
||
{
|
||
fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing.\n");
|
||
/* Claim it exited with unknown signal. */
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
|
||
return rtnval;
|
||
}
|
||
|
||
pi->had_event = 0; /* Indicate that we've seen this one */
|
||
return (rtnval);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
set_proc_siginfo - set a process's current signal info
|
||
|
||
SYNOPSIS
|
||
|
||
void set_proc_siginfo (struct procinfo *pip, int signo);
|
||
|
||
DESCRIPTION
|
||
|
||
Given a pointer to a process info struct in PIP and a signal number
|
||
in SIGNO, set the process's current signal and its associated signal
|
||
information. The signal will be delivered to the process immediately
|
||
after execution is resumed, even if it is being held. In addition,
|
||
this particular delivery will not cause another PR_SIGNALLED stop
|
||
even if the signal is being traced.
|
||
|
||
If we are not delivering the same signal that the prstatus siginfo
|
||
struct contains information about, then synthesize a siginfo struct
|
||
to match the signal we are doing to deliver, make it of the type
|
||
"generated by a user process", and send this synthesized copy. When
|
||
used to set the inferior's signal state, this will be required if we
|
||
are not currently stopped because of a traced signal, or if we decide
|
||
to continue with a different signal.
|
||
|
||
Note that when continuing the inferior from a stop due to receipt
|
||
of a traced signal, we either have set PRCSIG to clear the existing
|
||
signal, or we have to call this function to do a PIOCSSIG with either
|
||
the existing siginfo struct from pr_info, or one we have synthesized
|
||
appropriately for the signal we want to deliver. Otherwise if the
|
||
signal is still being traced, the inferior will immediately stop
|
||
again.
|
||
|
||
See siginfo(5) for more details.
|
||
*/
|
||
|
||
static void
|
||
set_proc_siginfo (pip, signo)
|
||
struct procinfo *pip;
|
||
int signo;
|
||
{
|
||
struct siginfo newsiginfo;
|
||
struct siginfo *sip;
|
||
|
||
#ifdef PROCFS_DONT_PIOCSSIG_CURSIG
|
||
/* With Alpha OSF/1 procfs, the kernel gets really confused if it
|
||
receives a PIOCSSIG with a signal identical to the current signal,
|
||
it messes up the current signal. Work around the kernel bug. */
|
||
if (signo == pip -> prstatus.pr_cursig)
|
||
return;
|
||
#endif
|
||
|
||
if (signo == pip -> prstatus.pr_info.si_signo)
|
||
{
|
||
sip = &pip -> prstatus.pr_info;
|
||
}
|
||
else
|
||
{
|
||
memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
|
||
sip = &newsiginfo;
|
||
sip -> si_signo = signo;
|
||
sip -> si_code = 0;
|
||
sip -> si_errno = 0;
|
||
sip -> si_pid = getpid ();
|
||
sip -> si_uid = getuid ();
|
||
}
|
||
if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
|
||
{
|
||
print_sys_errmsg (pip -> pathname, errno);
|
||
warning ("PIOCSSIG failed");
|
||
}
|
||
}
|
||
|
||
/* Resume execution of process PID. If STEP is nozero, then
|
||
just single step it. If SIGNAL is nonzero, restart it with that
|
||
signal activated. */
|
||
|
||
static void
|
||
procfs_resume (pid, step, signo)
|
||
int pid;
|
||
int step;
|
||
enum target_signal signo;
|
||
{
|
||
int signal_to_pass;
|
||
struct procinfo *pi, *procinfo;
|
||
|
||
pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
|
||
|
||
errno = 0;
|
||
pi->prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT;
|
||
|
||
#if 0
|
||
/* It should not be necessary. If the user explicitly changes the value,
|
||
value_assign calls write_register_bytes, which writes it. */
|
||
/* It may not be absolutely necessary to specify the PC value for
|
||
restarting, but to be safe we use the value that gdb considers
|
||
to be current. One case where this might be necessary is if the
|
||
user explicitly changes the PC value that gdb considers to be
|
||
current. FIXME: Investigate if this is necessary or not. */
|
||
|
||
#ifdef PRSVADDR_BROKEN
|
||
/* Can't do this under Solaris running on a Sparc, as there seems to be no
|
||
place to put nPC. In fact, if you use this, nPC seems to be set to some
|
||
random garbage. We have to rely on the fact that PC and nPC have been
|
||
written previously via PIOCSREG during a register flush. */
|
||
|
||
pi->prrun.pr_vaddr = (caddr_t) *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)];
|
||
pi->prrun.pr_flags != PRSVADDR;
|
||
#endif
|
||
#endif
|
||
|
||
if (signo == TARGET_SIGNAL_STOP && pi->nopass_next_sigstop)
|
||
/* When attaching to a child process, if we forced it to stop with
|
||
a PIOCSTOP, then we will have set the nopass_next_sigstop flag.
|
||
Upon resuming the first time after such a stop, we explicitly
|
||
inhibit sending it another SIGSTOP, which would be the normal
|
||
result of default signal handling. One potential drawback to
|
||
this is that we will also ignore any attempt to by the user
|
||
to explicitly continue after the attach with a SIGSTOP. Ultimately
|
||
this problem should be dealt with by making the routines that
|
||
deal with the inferior a little smarter, and possibly even allow
|
||
an inferior to continue running at the same time as gdb. (FIXME?) */
|
||
signal_to_pass = 0;
|
||
else if (signo == TARGET_SIGNAL_TSTP
|
||
&& pi->prstatus.pr_cursig == SIGTSTP
|
||
&& pi->prstatus.pr_action.sa_handler == SIG_DFL)
|
||
|
||
/* We are about to pass the inferior a SIGTSTP whose action is
|
||
SIG_DFL. The SIG_DFL action for a SIGTSTP is to stop
|
||
(notifying the parent via wait()), and then keep going from the
|
||
same place when the parent is ready for you to keep going. So
|
||
under the debugger, it should do nothing (as if the program had
|
||
been stopped and then later resumed. Under ptrace, this
|
||
happens for us, but under /proc, the system obligingly stops
|
||
the process, and wait_for_inferior would have no way of
|
||
distinguishing that type of stop (which indicates that we
|
||
should just start it again), with a stop due to the pr_trace
|
||
field of the prrun_t struct.
|
||
|
||
Note that if the SIGTSTP is being caught, we *do* need to pass it,
|
||
because the handler needs to get executed. */
|
||
signal_to_pass = 0;
|
||
else
|
||
signal_to_pass = target_signal_to_host (signo);
|
||
|
||
if (signal_to_pass)
|
||
{
|
||
set_proc_siginfo (pi, signal_to_pass);
|
||
}
|
||
else
|
||
{
|
||
pi->prrun.pr_flags |= PRCSIG;
|
||
}
|
||
pi->nopass_next_sigstop = 0;
|
||
if (step)
|
||
{
|
||
pi->prrun.pr_flags |= PRSTEP;
|
||
}
|
||
if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
|
||
{
|
||
perror_with_name (pi->pathname);
|
||
/* NOTREACHED */
|
||
}
|
||
|
||
pi->had_event = 0;
|
||
|
||
/* Continue all the other threads that haven't had an event of
|
||
interest. */
|
||
|
||
if (pid == -1)
|
||
for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
|
||
{
|
||
if (pi != procinfo && !procinfo->had_event)
|
||
{
|
||
procinfo->prrun.pr_flags &= PRSTEP;
|
||
procinfo->prrun.pr_flags |= PRCFAULT | PRCSIG;
|
||
ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
|
||
if (ioctl (procinfo->fd, PIOCRUN, &procinfo->prrun) < 0)
|
||
{
|
||
if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
|
||
{
|
||
fprintf_unfiltered(gdb_stderr, "PIOCSTATUS failed, errno=%d\n", errno);
|
||
}
|
||
print_sys_errmsg (procinfo->pathname, errno);
|
||
error ("PIOCRUN failed");
|
||
}
|
||
ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
procfs_fetch_registers -- fetch current registers from inferior
|
||
|
||
SYNOPSIS
|
||
|
||
void procfs_fetch_registers (int regno)
|
||
|
||
DESCRIPTION
|
||
|
||
Read the current values of the inferior's registers, both the
|
||
general register set and floating point registers (if supported)
|
||
and update gdb's idea of their current values.
|
||
|
||
*/
|
||
|
||
static void
|
||
procfs_fetch_registers (regno)
|
||
int regno;
|
||
{
|
||
struct procinfo *pi;
|
||
|
||
pi = current_procinfo;
|
||
|
||
if (ioctl (pi->fd, PIOCGREG, &pi->gregset) != -1)
|
||
{
|
||
supply_gregset (&pi->gregset);
|
||
}
|
||
#if defined (FP0_REGNUM)
|
||
if (ioctl (pi->fd, PIOCGFPREG, &pi->fpregset) != -1)
|
||
{
|
||
supply_fpregset (&pi->fpregset);
|
||
}
|
||
#endif
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
proc_init_failed - called whenever /proc access initialization
|
||
fails
|
||
|
||
SYNOPSIS
|
||
|
||
static void proc_init_failed (struct procinfo *pi, char *why)
|
||
|
||
DESCRIPTION
|
||
|
||
This function is called whenever initialization of access to a /proc
|
||
entry fails. It prints a suitable error message, does some cleanup,
|
||
and then invokes the standard error processing routine which dumps
|
||
us back into the command loop.
|
||
*/
|
||
|
||
static void
|
||
proc_init_failed (pi, why)
|
||
struct procinfo *pi;
|
||
char *why;
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
kill (pi->pid, SIGKILL);
|
||
close_proc_file (pi);
|
||
error (why);
|
||
/* NOTREACHED */
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
close_proc_file - close any currently open /proc entry
|
||
|
||
SYNOPSIS
|
||
|
||
static void close_proc_file (struct procinfo *pip)
|
||
|
||
DESCRIPTION
|
||
|
||
Close any currently open /proc entry and mark the process information
|
||
entry as invalid. In order to ensure that we don't try to reuse any
|
||
stale information, the pid, fd, and pathnames are explicitly
|
||
invalidated, which may be overkill.
|
||
|
||
*/
|
||
|
||
static void
|
||
close_proc_file (pip)
|
||
struct procinfo *pip;
|
||
{
|
||
struct procinfo *procinfo;
|
||
|
||
remove_fd (pip); /* Remove fd from poll/select list */
|
||
|
||
close (pip -> fd);
|
||
|
||
free (pip -> pathname);
|
||
|
||
/* Unlink pip from the procinfo chain. Note pip might not be on the list. */
|
||
|
||
if (procinfo_list == pip)
|
||
procinfo_list = pip->next;
|
||
else
|
||
for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
|
||
if (procinfo->next == pip)
|
||
procinfo->next = pip->next;
|
||
|
||
free (pip);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
open_proc_file - open a /proc entry for a given process id
|
||
|
||
SYNOPSIS
|
||
|
||
static int open_proc_file (int pid, struct procinfo *pip, int mode)
|
||
|
||
DESCRIPTION
|
||
|
||
Given a process id and a mode, close the existing open /proc
|
||
entry (if any) and open one for the new process id, in the
|
||
specified mode. Once it is open, then mark the local process
|
||
information structure as valid, which guarantees that the pid,
|
||
fd, and pathname fields match an open /proc entry. Returns
|
||
zero if the open fails, nonzero otherwise.
|
||
|
||
Note that the pathname is left intact, even when the open fails,
|
||
so that callers can use it to construct meaningful error messages
|
||
rather than just "file open failed".
|
||
*/
|
||
|
||
static int
|
||
open_proc_file (pid, pip, mode)
|
||
int pid;
|
||
struct procinfo *pip;
|
||
int mode;
|
||
{
|
||
pip -> next = NULL;
|
||
pip -> had_event = 0;
|
||
pip -> pathname = xmalloc (32);
|
||
pip -> pid = pid;
|
||
|
||
sprintf (pip -> pathname, PROC_NAME_FMT, pid);
|
||
if ((pip -> fd = open (pip -> pathname, mode)) < 0)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
static char *
|
||
mappingflags (flags)
|
||
long flags;
|
||
{
|
||
static char asciiflags[8];
|
||
|
||
strcpy (asciiflags, "-------");
|
||
#if defined (MA_PHYS)
|
||
if (flags & MA_PHYS) asciiflags[0] = 'd';
|
||
#endif
|
||
if (flags & MA_STACK) asciiflags[1] = 's';
|
||
if (flags & MA_BREAK) asciiflags[2] = 'b';
|
||
if (flags & MA_SHARED) asciiflags[3] = 's';
|
||
if (flags & MA_READ) asciiflags[4] = 'r';
|
||
if (flags & MA_WRITE) asciiflags[5] = 'w';
|
||
if (flags & MA_EXEC) asciiflags[6] = 'x';
|
||
return (asciiflags);
|
||
}
|
||
|
||
static void
|
||
info_proc_flags (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
struct trans *transp;
|
||
|
||
printf_filtered ("%-32s", "Process status flags:");
|
||
if (!summary)
|
||
{
|
||
printf_filtered ("\n\n");
|
||
}
|
||
for (transp = pr_flag_table; transp -> name != NULL; transp++)
|
||
{
|
||
if (pip -> prstatus.pr_flags & transp -> value)
|
||
{
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ", transp -> name);
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n", transp -> name, transp -> desc);
|
||
}
|
||
}
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
|
||
static void
|
||
info_proc_stop (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
struct trans *transp;
|
||
int why;
|
||
int what;
|
||
|
||
why = pip -> prstatus.pr_why;
|
||
what = pip -> prstatus.pr_what;
|
||
|
||
if (pip -> prstatus.pr_flags & PR_STOPPED)
|
||
{
|
||
printf_filtered ("%-32s", "Reason for stopping:");
|
||
if (!summary)
|
||
{
|
||
printf_filtered ("\n\n");
|
||
}
|
||
for (transp = pr_why_table; transp -> name != NULL; transp++)
|
||
{
|
||
if (why == transp -> value)
|
||
{
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ", transp -> name);
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n",
|
||
transp -> name, transp -> desc);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Use the pr_why field to determine what the pr_what field means, and
|
||
print more information. */
|
||
|
||
switch (why)
|
||
{
|
||
case PR_REQUESTED:
|
||
/* pr_what is unused for this case */
|
||
break;
|
||
case PR_JOBCONTROL:
|
||
case PR_SIGNALLED:
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ", signalname (what));
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n", signalname (what),
|
||
safe_strsignal (what));
|
||
}
|
||
break;
|
||
case PR_SYSENTRY:
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ", syscallname (what));
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n", syscallname (what),
|
||
"Entered this system call");
|
||
}
|
||
break;
|
||
case PR_SYSEXIT:
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ", syscallname (what));
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n", syscallname (what),
|
||
"Returned from this system call");
|
||
}
|
||
break;
|
||
case PR_FAULTED:
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ",
|
||
lookupname (faults_table, what, "fault"));
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n",
|
||
lookupname (faults_table, what, "fault"),
|
||
lookupdesc (faults_table, what));
|
||
}
|
||
break;
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
info_proc_siginfo (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
struct siginfo *sip;
|
||
|
||
if ((pip -> prstatus.pr_flags & PR_STOPPED) &&
|
||
(pip -> prstatus.pr_why == PR_SIGNALLED ||
|
||
pip -> prstatus.pr_why == PR_FAULTED))
|
||
{
|
||
printf_filtered ("%-32s", "Additional signal/fault info:");
|
||
sip = &pip -> prstatus.pr_info;
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%s ", signalname (sip -> si_signo));
|
||
if (sip -> si_errno > 0)
|
||
{
|
||
printf_filtered ("%s ", errnoname (sip -> si_errno));
|
||
}
|
||
if (sip -> si_code <= 0)
|
||
{
|
||
printf_filtered ("sent by %s, uid %d ",
|
||
target_pid_to_str (sip -> si_pid),
|
||
sip -> si_uid);
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("%s ", sigcodename (sip));
|
||
if ((sip -> si_signo == SIGILL) ||
|
||
(sip -> si_signo == SIGFPE) ||
|
||
(sip -> si_signo == SIGSEGV) ||
|
||
(sip -> si_signo == SIGBUS))
|
||
{
|
||
printf_filtered ("addr=%#lx ",
|
||
(unsigned long) sip -> si_addr);
|
||
}
|
||
else if ((sip -> si_signo == SIGCHLD))
|
||
{
|
||
printf_filtered ("child %s, status %u ",
|
||
target_pid_to_str (sip -> si_pid),
|
||
sip -> si_status);
|
||
}
|
||
else if ((sip -> si_signo == SIGPOLL))
|
||
{
|
||
printf_filtered ("band %u ", sip -> si_band);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\n\n");
|
||
printf_filtered ("\t%-16s %s.\n", signalname (sip -> si_signo),
|
||
safe_strsignal (sip -> si_signo));
|
||
if (sip -> si_errno > 0)
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n",
|
||
errnoname (sip -> si_errno),
|
||
safe_strerror (sip -> si_errno));
|
||
}
|
||
if (sip -> si_code <= 0)
|
||
{
|
||
printf_filtered ("\t%-16u %s\n", sip -> si_pid, /* XXX need target_pid_to_str() */
|
||
"PID of process sending signal");
|
||
printf_filtered ("\t%-16u %s\n", sip -> si_uid,
|
||
"UID of process sending signal");
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("\t%-16s %s.\n", sigcodename (sip),
|
||
sigcodedesc (sip));
|
||
if ((sip -> si_signo == SIGILL) ||
|
||
(sip -> si_signo == SIGFPE))
|
||
{
|
||
printf_filtered ("\t%#-16lx %s.\n",
|
||
(unsigned long) sip -> si_addr,
|
||
"Address of faulting instruction");
|
||
}
|
||
else if ((sip -> si_signo == SIGSEGV) ||
|
||
(sip -> si_signo == SIGBUS))
|
||
{
|
||
printf_filtered ("\t%#-16lx %s.\n",
|
||
(unsigned long) sip -> si_addr,
|
||
"Address of faulting memory reference");
|
||
}
|
||
else if ((sip -> si_signo == SIGCHLD))
|
||
{
|
||
printf_filtered ("\t%-16u %s.\n", sip -> si_pid, /* XXX need target_pid_to_str() */
|
||
"Child process ID");
|
||
printf_filtered ("\t%-16u %s.\n", sip -> si_status,
|
||
"Child process exit value or signal");
|
||
}
|
||
else if ((sip -> si_signo == SIGPOLL))
|
||
{
|
||
printf_filtered ("\t%-16u %s.\n", sip -> si_band,
|
||
"Band event for POLL_{IN,OUT,MSG}");
|
||
}
|
||
}
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
info_proc_syscalls (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
int syscallnum;
|
||
|
||
if (!summary)
|
||
{
|
||
|
||
#if 0 /* FIXME: Needs to use gdb-wide configured info about system calls. */
|
||
if (pip -> prstatus.pr_flags & PR_ASLEEP)
|
||
{
|
||
int syscallnum = pip -> prstatus.pr_reg[R_D0];
|
||
if (summary)
|
||
{
|
||
printf_filtered ("%-32s", "Sleeping in system call:");
|
||
printf_filtered ("%s", syscallname (syscallnum));
|
||
}
|
||
else
|
||
{
|
||
printf_filtered ("Sleeping in system call '%s'.\n",
|
||
syscallname (syscallnum));
|
||
}
|
||
}
|
||
#endif
|
||
|
||
if (ioctl (pip -> fd, PIOCGENTRY, &pip -> entryset) < 0)
|
||
{
|
||
print_sys_errmsg (pip -> pathname, errno);
|
||
error ("PIOCGENTRY failed");
|
||
}
|
||
|
||
if (ioctl (pip -> fd, PIOCGEXIT, &pip -> exitset) < 0)
|
||
{
|
||
print_sys_errmsg (pip -> pathname, errno);
|
||
error ("PIOCGEXIT failed");
|
||
}
|
||
|
||
printf_filtered ("System call tracing information:\n\n");
|
||
|
||
printf_filtered ("\t%-12s %-8s %-8s\n",
|
||
"System call",
|
||
"Entry",
|
||
"Exit");
|
||
for (syscallnum = 0; syscallnum < MAX_SYSCALLS; syscallnum++)
|
||
{
|
||
QUIT;
|
||
if (syscall_table[syscallnum] != NULL)
|
||
{
|
||
printf_filtered ("\t%-12s ", syscall_table[syscallnum]);
|
||
printf_filtered ("%-8s ",
|
||
prismember (&pip -> entryset, syscallnum)
|
||
? "on" : "off");
|
||
printf_filtered ("%-8s ",
|
||
prismember (&pip -> exitset, syscallnum)
|
||
? "on" : "off");
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static char *
|
||
signalname (signo)
|
||
int signo;
|
||
{
|
||
const char *name;
|
||
static char locbuf[32];
|
||
|
||
name = strsigno (signo);
|
||
if (name == NULL)
|
||
{
|
||
sprintf (locbuf, "Signal %d", signo);
|
||
}
|
||
else
|
||
{
|
||
sprintf (locbuf, "%s (%d)", name, signo);
|
||
}
|
||
return (locbuf);
|
||
}
|
||
|
||
static char *
|
||
errnoname (errnum)
|
||
int errnum;
|
||
{
|
||
const char *name;
|
||
static char locbuf[32];
|
||
|
||
name = strerrno (errnum);
|
||
if (name == NULL)
|
||
{
|
||
sprintf (locbuf, "Errno %d", errnum);
|
||
}
|
||
else
|
||
{
|
||
sprintf (locbuf, "%s (%d)", name, errnum);
|
||
}
|
||
return (locbuf);
|
||
}
|
||
|
||
static void
|
||
info_proc_signals (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
int signo;
|
||
|
||
if (!summary)
|
||
{
|
||
if (ioctl (pip -> fd, PIOCGTRACE, &pip -> trace) < 0)
|
||
{
|
||
print_sys_errmsg (pip -> pathname, errno);
|
||
error ("PIOCGTRACE failed");
|
||
}
|
||
|
||
printf_filtered ("Disposition of signals:\n\n");
|
||
printf_filtered ("\t%-15s %-8s %-8s %-8s %s\n\n",
|
||
"Signal", "Trace", "Hold", "Pending", "Description");
|
||
for (signo = 0; signo < NSIG; signo++)
|
||
{
|
||
QUIT;
|
||
printf_filtered ("\t%-15s ", signalname (signo));
|
||
printf_filtered ("%-8s ",
|
||
prismember (&pip -> trace, signo)
|
||
? "on" : "off");
|
||
printf_filtered ("%-8s ",
|
||
prismember (&pip -> prstatus.pr_sighold, signo)
|
||
? "on" : "off");
|
||
|
||
#ifdef PROCFS_SIGPEND_OFFSET
|
||
/* Alpha OSF/1 numbers the pending signals from 1. */
|
||
printf_filtered ("%-8s ",
|
||
(signo ? prismember (&pip -> prstatus.pr_sigpend,
|
||
signo - 1)
|
||
: 0)
|
||
? "yes" : "no");
|
||
#else
|
||
printf_filtered ("%-8s ",
|
||
prismember (&pip -> prstatus.pr_sigpend, signo)
|
||
? "yes" : "no");
|
||
#endif
|
||
printf_filtered (" %s\n", safe_strsignal (signo));
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
info_proc_faults (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
struct trans *transp;
|
||
|
||
if (!summary)
|
||
{
|
||
if (ioctl (pip -> fd, PIOCGFAULT, &pip -> fltset) < 0)
|
||
{
|
||
print_sys_errmsg (pip -> pathname, errno);
|
||
error ("PIOCGFAULT failed");
|
||
}
|
||
|
||
printf_filtered ("Current traced hardware fault set:\n\n");
|
||
printf_filtered ("\t%-12s %-8s\n", "Fault", "Trace");
|
||
|
||
for (transp = faults_table; transp -> name != NULL; transp++)
|
||
{
|
||
QUIT;
|
||
printf_filtered ("\t%-12s ", transp -> name);
|
||
printf_filtered ("%-8s", prismember (&pip -> fltset, transp -> value)
|
||
? "on" : "off");
|
||
printf_filtered ("\n");
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
info_proc_mappings (pip, summary)
|
||
struct procinfo *pip;
|
||
int summary;
|
||
{
|
||
int nmap;
|
||
struct prmap *prmaps;
|
||
struct prmap *prmap;
|
||
|
||
if (!summary)
|
||
{
|
||
printf_filtered ("Mapped address spaces:\n\n");
|
||
#ifdef BFD_HOST_64_BIT
|
||
printf_filtered (" %18s %18s %10s %10s %7s\n",
|
||
#else
|
||
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
|
||
#endif
|
||
"Start Addr",
|
||
" End Addr",
|
||
" Size",
|
||
" Offset",
|
||
"Flags");
|
||
if (ioctl (pip -> fd, PIOCNMAP, &nmap) == 0)
|
||
{
|
||
prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
|
||
if (ioctl (pip -> fd, PIOCMAP, prmaps) == 0)
|
||
{
|
||
for (prmap = prmaps; prmap -> pr_size; ++prmap)
|
||
{
|
||
#ifdef BFD_HOST_64_BIT
|
||
printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
|
||
#else
|
||
printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
|
||
#endif
|
||
(unsigned long)prmap -> pr_vaddr,
|
||
(unsigned long)prmap -> pr_vaddr
|
||
+ prmap -> pr_size - 1,
|
||
prmap -> pr_size,
|
||
prmap -> pr_off,
|
||
mappingflags (prmap -> pr_mflags));
|
||
}
|
||
}
|
||
}
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
info_proc -- implement the "info proc" command
|
||
|
||
SYNOPSIS
|
||
|
||
void info_proc (char *args, int from_tty)
|
||
|
||
DESCRIPTION
|
||
|
||
Implement gdb's "info proc" command by using the /proc interface
|
||
to print status information about any currently running process.
|
||
|
||
Examples of the use of "info proc" are:
|
||
|
||
info proc (prints summary info for current inferior)
|
||
info proc 123 (prints summary info for process with pid 123)
|
||
info proc mappings (prints address mappings)
|
||
info proc times (prints process/children times)
|
||
info proc id (prints pid, ppid, gid, sid, etc)
|
||
FIXME: i proc id not implemented.
|
||
info proc status (prints general process state info)
|
||
FIXME: i proc status not implemented.
|
||
info proc signals (prints info about signal handling)
|
||
info proc all (prints all info)
|
||
|
||
*/
|
||
|
||
static void
|
||
info_proc (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
int pid;
|
||
struct procinfo *pip;
|
||
struct cleanup *old_chain;
|
||
char **argv;
|
||
int argsize;
|
||
int summary = 1;
|
||
int flags = 0;
|
||
int syscalls = 0;
|
||
int signals = 0;
|
||
int faults = 0;
|
||
int mappings = 0;
|
||
int times = 0;
|
||
int id = 0;
|
||
int status = 0;
|
||
int all = 0;
|
||
|
||
old_chain = make_cleanup (null_cleanup, 0);
|
||
|
||
/* Default to using the current inferior if no pid specified. Note
|
||
that inferior_pid may be 0, hence we set okerr. */
|
||
|
||
pip = find_procinfo (inferior_pid, 1);
|
||
|
||
if (args != NULL)
|
||
{
|
||
if ((argv = buildargv (args)) == NULL)
|
||
{
|
||
nomem (0);
|
||
}
|
||
make_cleanup (freeargv, (char *) argv);
|
||
|
||
while (*argv != NULL)
|
||
{
|
||
argsize = strlen (*argv);
|
||
if (argsize >= 1 && strncmp (*argv, "all", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
all = 1;
|
||
}
|
||
else if (argsize >= 2 && strncmp (*argv, "faults", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
faults = 1;
|
||
}
|
||
else if (argsize >= 2 && strncmp (*argv, "flags", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
flags = 1;
|
||
}
|
||
else if (argsize >= 1 && strncmp (*argv, "id", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
id = 1;
|
||
}
|
||
else if (argsize >= 1 && strncmp (*argv, "mappings", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
mappings = 1;
|
||
}
|
||
else if (argsize >= 2 && strncmp (*argv, "signals", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
signals = 1;
|
||
}
|
||
else if (argsize >= 2 && strncmp (*argv, "status", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
status = 1;
|
||
}
|
||
else if (argsize >= 2 && strncmp (*argv, "syscalls", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
syscalls = 1;
|
||
}
|
||
else if (argsize >= 1 && strncmp (*argv, "times", argsize) == 0)
|
||
{
|
||
summary = 0;
|
||
times = 1;
|
||
}
|
||
else if ((pid = atoi (*argv)) > 0)
|
||
{
|
||
pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
|
||
memset (pip, 0, sizeof (*pip));
|
||
|
||
pip->pid = pid;
|
||
if (!open_proc_file (pid, pip, O_RDONLY))
|
||
{
|
||
perror_with_name (pip -> pathname);
|
||
/* NOTREACHED */
|
||
}
|
||
make_cleanup (close_proc_file, pip);
|
||
}
|
||
else if (**argv != '\000')
|
||
{
|
||
error ("Unrecognized or ambiguous keyword `%s'.", *argv);
|
||
}
|
||
argv++;
|
||
}
|
||
}
|
||
|
||
/* If we don't have a valid open process at this point, then we have no
|
||
inferior or didn't specify a specific pid. */
|
||
|
||
if (!pip)
|
||
{
|
||
error ("\
|
||
No process. Start debugging a program or specify an explicit process ID.");
|
||
}
|
||
if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0)
|
||
{
|
||
print_sys_errmsg (pip -> pathname, errno);
|
||
error ("PIOCSTATUS failed");
|
||
}
|
||
|
||
/* Print verbose information of the requested type(s), or just a summary
|
||
of the information for all types. */
|
||
|
||
printf_filtered ("\nInformation for %s:\n\n", pip -> pathname);
|
||
if (summary || all || flags)
|
||
{
|
||
info_proc_flags (pip, summary);
|
||
}
|
||
if (summary || all)
|
||
{
|
||
info_proc_stop (pip, summary);
|
||
}
|
||
if (summary || all || signals || faults)
|
||
{
|
||
info_proc_siginfo (pip, summary);
|
||
}
|
||
if (summary || all || syscalls)
|
||
{
|
||
info_proc_syscalls (pip, summary);
|
||
}
|
||
if (summary || all || mappings)
|
||
{
|
||
info_proc_mappings (pip, summary);
|
||
}
|
||
if (summary || all || signals)
|
||
{
|
||
info_proc_signals (pip, summary);
|
||
}
|
||
if (summary || all || faults)
|
||
{
|
||
info_proc_faults (pip, summary);
|
||
}
|
||
printf_filtered ("\n");
|
||
|
||
/* All done, deal with closing any temporary process info structure,
|
||
freeing temporary memory , etc. */
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
|
||
/*
|
||
|
||
LOCAL FUNCTION
|
||
|
||
procfs_set_sproc_trap -- arrange for child to stop on sproc().
|
||
|
||
SYNOPSIS
|
||
|
||
void procfs_set_sproc_trap (struct procinfo *)
|
||
|
||
DESCRIPTION
|
||
|
||
This function sets up a trap on sproc system call exits so that we can
|
||
detect the arrival of a new thread. We are called with the new thread
|
||
stopped prior to it's first instruction.
|
||
|
||
Also note that we turn on the inherit-on-fork flag in the child process
|
||
so that any grand-children start with all tracing flags set.
|
||
*/
|
||
|
||
#ifdef SYS_sproc
|
||
|
||
static void
|
||
procfs_set_sproc_trap (pi)
|
||
struct procinfo *pi;
|
||
{
|
||
sysset_t exitset;
|
||
|
||
if (ioctl (pi->fd, PIOCGEXIT, &exitset) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCGEXIT failed");
|
||
}
|
||
|
||
praddset (&exitset, SYS_sproc);
|
||
|
||
/* We trap on fork() and vfork() in order to disable debugging in our grand-
|
||
children and descendant processes. At this time, GDB can only handle
|
||
threads (multiple processes, one address space). forks (and execs) result
|
||
in the creation of multiple address spaces, which GDB can't handle yet. */
|
||
|
||
praddset (&exitset, SYS_fork);
|
||
#ifdef SYS_vfork
|
||
praddset (&exitset, SYS_vfork);
|
||
#endif
|
||
|
||
if (ioctl (pi->fd, PIOCSEXIT, &exitset) < 0)
|
||
{
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCSEXIT failed");
|
||
}
|
||
|
||
/* Turn on inherit-on-fork flag so that all grand-children of gdb start with
|
||
tracing flags set. */
|
||
|
||
#ifdef PIOCSET /* New method */
|
||
{
|
||
long pr_flags;
|
||
pr_flags = PR_FORK;
|
||
ioctl (pi->fd, PIOCSET, &pr_flags);
|
||
}
|
||
#else
|
||
#ifdef PIOCSFORK /* Original method */
|
||
ioctl (pi->fd, PIOCSFORK, NULL);
|
||
#endif
|
||
#endif
|
||
}
|
||
#endif /* SYS_sproc */
|
||
|
||
/* Fork an inferior process, and start debugging it with /proc. */
|
||
|
||
static void
|
||
procfs_create_inferior (exec_file, allargs, env)
|
||
char *exec_file;
|
||
char *allargs;
|
||
char **env;
|
||
{
|
||
char *shell_file = getenv ("SHELL");
|
||
char *tryname;
|
||
if (shell_file != NULL && strchr (shell_file, '/') == NULL)
|
||
{
|
||
|
||
/* We will be looking down the PATH to find shell_file. If we
|
||
just do this the normal way (via execlp, which operates by
|
||
attempting an exec for each element of the PATH until it
|
||
finds one which succeeds), then there will be an exec for
|
||
each failed attempt, each of which will cause a PR_SYSEXIT
|
||
stop, and we won't know how to distinguish the PR_SYSEXIT's
|
||
for these failed execs with the ones for successful execs
|
||
(whether the exec has succeeded is stored at that time in the
|
||
carry bit or some such architecture-specific and
|
||
non-ABI-specified place).
|
||
|
||
So I can't think of anything better than to search the PATH
|
||
now. This has several disadvantages: (1) There is a race
|
||
condition; if we find a file now and it is deleted before we
|
||
exec it, we lose, even if the deletion leaves a valid file
|
||
further down in the PATH, (2) there is no way to know exactly
|
||
what an executable (in the sense of "capable of being
|
||
exec'd") file is. Using access() loses because it may lose
|
||
if the caller is the superuser; failing to use it loses if
|
||
there are ACLs or some such. */
|
||
|
||
char *p;
|
||
char *p1;
|
||
/* FIXME-maybe: might want "set path" command so user can change what
|
||
path is used from within GDB. */
|
||
char *path = getenv ("PATH");
|
||
int len;
|
||
struct stat statbuf;
|
||
|
||
if (path == NULL)
|
||
path = "/bin:/usr/bin";
|
||
|
||
tryname = alloca (strlen (path) + strlen (shell_file) + 2);
|
||
for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)
|
||
{
|
||
p1 = strchr (p, ':');
|
||
if (p1 != NULL)
|
||
len = p1 - p;
|
||
else
|
||
len = strlen (p);
|
||
strncpy (tryname, p, len);
|
||
tryname[len] = '\0';
|
||
strcat (tryname, "/");
|
||
strcat (tryname, shell_file);
|
||
if (access (tryname, X_OK) < 0)
|
||
continue;
|
||
if (stat (tryname, &statbuf) < 0)
|
||
continue;
|
||
if (!S_ISREG (statbuf.st_mode))
|
||
/* We certainly need to reject directories. I'm not quite
|
||
as sure about FIFOs, sockets, etc., but I kind of doubt
|
||
that people want to exec() these things. */
|
||
continue;
|
||
break;
|
||
}
|
||
if (p == NULL)
|
||
/* Not found. This must be an error rather than merely passing
|
||
the file to execlp(), because execlp() would try all the
|
||
exec()s, causing GDB to get confused. */
|
||
error ("Can't find shell %s in PATH", shell_file);
|
||
|
||
shell_file = tryname;
|
||
}
|
||
|
||
fork_inferior (exec_file, allargs, env,
|
||
proc_set_exec_trap, procfs_init_inferior, shell_file);
|
||
|
||
/* We are at the first instruction we care about. */
|
||
/* Pedal to the metal... */
|
||
|
||
/* Setup traps on exit from sproc() */
|
||
|
||
#ifdef SYS_sproc
|
||
procfs_set_sproc_trap (current_procinfo);
|
||
#endif
|
||
|
||
proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
/* Clean up after the inferior dies. */
|
||
|
||
static void
|
||
procfs_mourn_inferior ()
|
||
{
|
||
struct procinfo *pi;
|
||
struct procinfo *next_pi;
|
||
|
||
for (pi = procinfo_list; pi; pi = next_pi)
|
||
{
|
||
next_pi = pi->next;
|
||
unconditionally_kill_inferior (pi);
|
||
}
|
||
|
||
unpush_target (&procfs_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
|
||
/* Mark our target-struct as eligible for stray "run" and "attach" commands. */
|
||
static int
|
||
procfs_can_run ()
|
||
{
|
||
return(1);
|
||
}
|
||
#ifdef TARGET_HAS_HARDWARE_WATCHPOINTS
|
||
|
||
/* Insert a watchpoint */
|
||
int
|
||
procfs_set_watchpoint(pid, addr, len, rw)
|
||
int pid;
|
||
CORE_ADDR addr;
|
||
int len;
|
||
int rw;
|
||
{
|
||
struct procinfo *pi;
|
||
prwatch_t wpt;
|
||
|
||
pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
|
||
wpt.pr_vaddr = (caddr_t)addr;
|
||
wpt.pr_size = len;
|
||
wpt.pr_wflags = ((rw & 1) ? MA_READ : 0) | ((rw & 2) ? MA_WRITE : 0);
|
||
if (ioctl (pi->fd, PIOCSWATCH, &wpt) < 0)
|
||
{
|
||
if (errno == E2BIG)
|
||
return -1;
|
||
/* Currently it sometimes happens that the same watchpoint gets
|
||
deleted twice - don't die in this case (FIXME please) */
|
||
if (errno == ESRCH && len == 0)
|
||
return 0;
|
||
print_sys_errmsg (pi->pathname, errno);
|
||
error ("PIOCSWATCH failed");
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
procfs_stopped_by_watchpoint(pid)
|
||
int pid;
|
||
{
|
||
struct procinfo *pi;
|
||
short what;
|
||
short why;
|
||
|
||
pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
|
||
if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
|
||
{
|
||
why = pi->prstatus.pr_why;
|
||
what = pi->prstatus.pr_what;
|
||
if (why == PR_FAULTED
|
||
#if defined (FLTWATCH) && defined (FLTKWATCH)
|
||
&& (what == FLTWATCH) || (what == FLTKWATCH)
|
||
#else
|
||
#ifdef FLTWATCH
|
||
&& (what == FLTWATCH)
|
||
#endif
|
||
#ifdef FLTKWATCH
|
||
&& (what == FLTKWATCH)
|
||
#endif
|
||
#endif
|
||
)
|
||
return what;
|
||
}
|
||
return 0;
|
||
}
|
||
#endif
|
||
|
||
/* Send a SIGINT to the process group. This acts just like the user typed a
|
||
^C on the controlling terminal.
|
||
|
||
XXX - This may not be correct for all systems. Some may want to use
|
||
killpg() instead of kill (-pgrp). */
|
||
|
||
void
|
||
procfs_stop ()
|
||
{
|
||
extern pid_t inferior_process_group;
|
||
|
||
kill (-inferior_process_group, SIGINT);
|
||
}
|
||
|
||
|
||
struct target_ops procfs_ops = {
|
||
"procfs", /* to_shortname */
|
||
"Unix /proc child process", /* to_longname */
|
||
"Unix /proc child process (started by the \"run\" command).", /* to_doc */
|
||
procfs_open, /* to_open */
|
||
0, /* to_close */
|
||
procfs_attach, /* to_attach */
|
||
procfs_detach, /* to_detach */
|
||
procfs_resume, /* to_resume */
|
||
procfs_wait, /* to_wait */
|
||
procfs_fetch_registers, /* to_fetch_registers */
|
||
procfs_store_registers, /* to_store_registers */
|
||
procfs_prepare_to_store, /* to_prepare_to_store */
|
||
procfs_xfer_memory, /* to_xfer_memory */
|
||
procfs_files_info, /* to_files_info */
|
||
memory_insert_breakpoint, /* to_insert_breakpoint */
|
||
memory_remove_breakpoint, /* to_remove_breakpoint */
|
||
terminal_init_inferior, /* to_terminal_init */
|
||
terminal_inferior, /* to_terminal_inferior */
|
||
terminal_ours_for_output, /* to_terminal_ours_for_output */
|
||
terminal_ours, /* to_terminal_ours */
|
||
child_terminal_info, /* to_terminal_info */
|
||
procfs_kill_inferior, /* to_kill */
|
||
0, /* to_load */
|
||
0, /* to_lookup_symbol */
|
||
procfs_create_inferior, /* to_create_inferior */
|
||
procfs_mourn_inferior, /* to_mourn_inferior */
|
||
procfs_can_run, /* to_can_run */
|
||
procfs_notice_signals, /* to_notice_signals */
|
||
0, /* to_thread_alive */
|
||
procfs_stop, /* to_stop */
|
||
process_stratum, /* to_stratum */
|
||
0, /* to_next */
|
||
1, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
1, /* to_has_stack */
|
||
1, /* to_has_registers */
|
||
1, /* to_has_execution */
|
||
0, /* sections */
|
||
0, /* sections_end */
|
||
OPS_MAGIC /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_procfs ()
|
||
{
|
||
#ifdef HAVE_OPTIONAL_PROC_FS
|
||
char procname[32];
|
||
int fd;
|
||
|
||
/* If we have an optional /proc filesystem (e.g. under OSF/1),
|
||
don't add procfs support if we cannot access the running
|
||
GDB via /proc. */
|
||
sprintf (procname, PROC_NAME_FMT, getpid ());
|
||
if ((fd = open (procname, O_RDONLY)) < 0)
|
||
return;
|
||
close (fd);
|
||
#endif
|
||
|
||
add_target (&procfs_ops);
|
||
|
||
add_info ("proc", info_proc,
|
||
"Show process status information using /proc entry.\n\
|
||
Specify process id or use current inferior by default.\n\
|
||
Specify keywords for detailed information; default is summary.\n\
|
||
Keywords are: `all', `faults', `flags', `id', `mappings', `signals',\n\
|
||
`status', `syscalls', and `times'.\n\
|
||
Unambiguous abbreviations may be used.");
|
||
|
||
init_syscall_table ();
|
||
}
|