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436 lines
12 KiB
C
436 lines
12 KiB
C
/* Machine independent support for Solaris /proc (process file system) for GDB.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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Written by Michael Snyder at Cygnus Solutions.
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Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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/*
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* Pretty-print trace of api calls to the /proc api
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*/
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#include "defs.h"
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#include "gdbcmd.h"
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#include "completer.h"
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#include <sys/types.h>
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#include <sys/procfs.h>
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#include <sys/proc.h> /* for struct proc */
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#include <sys/user.h> /* for struct user */
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#include <fcntl.h> /* for O_RDWR etc. */
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#include "gdbsupport/gdb_wait.h"
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#include "proc-utils.h"
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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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long value; /* The numeric value */
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const char *name; /* The equivalent symbolic value */
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const char *desc; /* Short description of value */
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};
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static bool procfs_trace = false;
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static FILE *procfs_file = NULL;
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static char *procfs_filename;
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static void
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prepare_to_trace (void)
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{
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if (procfs_trace) /* if procfs tracing turned on */
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if (procfs_file == NULL) /* if output file not yet open */
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procfs_file = fopen (procfs_filename, "a"); /* open output file */
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}
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static void
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set_procfs_trace_cmd (const char *args,
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int from_tty, struct cmd_list_element *c)
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{
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#if 0 /* not sure what I might actually need to do here, if anything */
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if (procfs_file)
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fflush (procfs_file);
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#endif
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}
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static void
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set_procfs_file_cmd (const char *args,
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int from_tty, struct cmd_list_element *c)
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{
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/* Just changed the filename for procfs tracing.
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If a file was already open, close it. */
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if (procfs_file)
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fclose (procfs_file);
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procfs_file = NULL;
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}
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static struct trans rw_table[] = {
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{ PCAGENT, "PCAGENT", "create agent lwp with regs from argument" },
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{ PCCFAULT, "PCCFAULT", "clear current fault" },
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{ PCCSIG, "PCCSIG", "clear current signal" },
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{ PCDSTOP, "PCDSTOP", "post stop request" },
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{ PCKILL, "PCKILL", "post a signal" },
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{ PCNICE, "PCNICE", "set nice priority" },
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{ PCREAD, "PCREAD", "read from the address space" },
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{ PCWRITE, "PCWRITE", "write to the address space" },
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{ PCRUN, "PCRUN", "make process/lwp runnable" },
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{ PCSASRS, "PCSASRS", "set ancillary state registers" },
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{ PCSCRED, "PCSCRED", "set process credentials" },
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{ PCSENTRY, "PCSENTRY", "set traced syscall entry set" },
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{ PCSET, "PCSET", "set modes" },
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{ PCSEXIT, "PCSEXIT", "set traced syscall exit set" },
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{ PCSFAULT, "PCSFAULT", "set traced fault set" },
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{ PCSFPREG, "PCSFPREG", "set floating point registers" },
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{ PCSHOLD, "PCSHOLD", "set signal mask" },
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{ PCSREG, "PCSREG", "set general registers" },
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{ PCSSIG, "PCSSIG", "set current signal" },
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{ PCSTOP, "PCSTOP", "post stop request and wait" },
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{ PCSTRACE, "PCSTRACE", "set traced signal set" },
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{ PCSVADDR, "PCSVADDR", "set pc virtual address" },
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{ PCSXREG, "PCSXREG", "set extra registers" },
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{ PCTWSTOP, "PCTWSTOP", "wait for stop, with timeout arg" },
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{ PCUNKILL, "PCUNKILL", "delete a pending signal" },
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{ PCUNSET, "PCUNSET", "unset modes" },
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{ PCWATCH, "PCWATCH", "set/unset watched memory area" },
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{ PCWSTOP, "PCWSTOP", "wait for process/lwp to stop, no timeout" },
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{ 0, NULL, NULL }
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};
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static off_t lseek_offset;
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int
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write_with_trace (int fd, void *varg, size_t len, char *file, int line)
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{
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int i = ARRAY_SIZE (rw_table) - 1;
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int ret;
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procfs_ctl_t *arg = (procfs_ctl_t *) varg;
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prepare_to_trace ();
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if (procfs_trace)
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{
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procfs_ctl_t opcode = arg[0];
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for (i = 0; rw_table[i].name != NULL; i++)
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if (rw_table[i].value == opcode)
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break;
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if (info_verbose)
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fprintf (procfs_file ? procfs_file : stdout,
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"%s:%d -- ", file, line);
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switch (opcode) {
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case PCSET:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSET, %s) %s\n",
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arg[1] == PR_FORK ? "PR_FORK" :
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arg[1] == PR_RLC ? "PR_RLC" :
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arg[1] == PR_ASYNC ? "PR_ASYNC" :
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"<unknown flag>",
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info_verbose ? rw_table[i].desc : "");
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break;
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case PCUNSET:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCRESET, %s) %s\n",
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arg[1] == PR_FORK ? "PR_FORK" :
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arg[1] == PR_RLC ? "PR_RLC" :
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arg[1] == PR_ASYNC ? "PR_ASYNC" :
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"<unknown flag>",
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info_verbose ? rw_table[i].desc : "");
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break;
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case PCSTRACE:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSTRACE) ");
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proc_prettyfprint_signalset (procfs_file ? procfs_file : stdout,
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(sigset_t *) &arg[1], 0);
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break;
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case PCSFAULT:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSFAULT) ");
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proc_prettyfprint_faultset (procfs_file ? procfs_file : stdout,
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(fltset_t *) &arg[1], 0);
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break;
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case PCSENTRY:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSENTRY) ");
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proc_prettyfprint_syscalls (procfs_file ? procfs_file : stdout,
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(sysset_t *) &arg[1], 0);
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break;
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case PCSEXIT:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSEXIT) ");
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proc_prettyfprint_syscalls (procfs_file ? procfs_file : stdout,
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(sysset_t *) &arg[1], 0);
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break;
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case PCSHOLD:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSHOLD) ");
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proc_prettyfprint_signalset (procfs_file ? procfs_file : stdout,
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(sigset_t *) &arg[1], 0);
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break;
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case PCSSIG:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCSSIG) ");
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proc_prettyfprint_signal (procfs_file ? procfs_file : stdout,
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arg[1] ? ((siginfo_t *) &arg[1])->si_signo
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: 0,
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0);
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fprintf (procfs_file ? procfs_file : stdout, "\n");
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break;
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case PCRUN:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCRUN) ");
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if (arg[1] & PRCSIG)
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fprintf (procfs_file ? procfs_file : stdout, "clearSig ");
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if (arg[1] & PRCFAULT)
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fprintf (procfs_file ? procfs_file : stdout, "clearFlt ");
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if (arg[1] & PRSTEP)
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fprintf (procfs_file ? procfs_file : stdout, "step ");
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if (arg[1] & PRSABORT)
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fprintf (procfs_file ? procfs_file : stdout, "syscallAbort ");
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if (arg[1] & PRSTOP)
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fprintf (procfs_file ? procfs_file : stdout, "stopReq ");
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fprintf (procfs_file ? procfs_file : stdout, "\n");
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break;
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case PCKILL:
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fprintf (procfs_file ? procfs_file : stdout,
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"write (PCKILL) ");
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proc_prettyfprint_signal (procfs_file ? procfs_file : stdout,
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arg[1], 0);
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fprintf (procfs_file ? procfs_file : stdout, "\n");
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break;
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default:
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{
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if (rw_table[i].name)
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fprintf (procfs_file ? procfs_file : stdout,
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"write (%s) %s\n",
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rw_table[i].name,
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info_verbose ? rw_table[i].desc : "");
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else
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{
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if (lseek_offset != -1)
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fprintf (procfs_file ? procfs_file : stdout,
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"write (<unknown>, %lud bytes at 0x%08lx) \n",
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(unsigned long) len, (unsigned long) lseek_offset);
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else
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fprintf (procfs_file ? procfs_file : stdout,
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"write (<unknown>, %lud bytes) \n",
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(unsigned long) len);
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}
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break;
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}
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}
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if (procfs_file)
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fflush (procfs_file);
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}
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errno = 0;
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ret = write (fd, (void *) arg, len);
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if (procfs_trace && ret != len)
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{
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fprintf (procfs_file ? procfs_file : stdout,
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"[write (%s) FAILED! (%s)]\n",
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rw_table[i].name != NULL ?
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rw_table[i].name : "<unknown>",
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safe_strerror (errno));
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if (procfs_file)
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fflush (procfs_file);
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}
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lseek_offset = -1;
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return ret;
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}
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off_t
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lseek_with_trace (int fd, off_t offset, int whence, char *file, int line)
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{
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off_t ret;
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prepare_to_trace ();
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errno = 0;
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ret = lseek (fd, offset, whence);
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lseek_offset = ret;
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if (procfs_trace && (ret == -1 || errno != 0))
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{
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fprintf (procfs_file ? procfs_file : stdout,
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"[lseek (0x%08lx) FAILED! (%s)]\n",
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(unsigned long) offset, safe_strerror (errno));
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if (procfs_file)
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fflush (procfs_file);
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}
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return ret;
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}
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int
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open_with_trace (char *filename, int mode, char *file, int line)
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{
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int ret;
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prepare_to_trace ();
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errno = 0;
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ret = open (filename, mode);
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if (procfs_trace)
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{
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if (info_verbose)
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fprintf (procfs_file ? procfs_file : stdout,
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"%s:%d -- ", file, line);
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if (errno)
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{
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fprintf (procfs_file ? procfs_file : stdout,
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"[open FAILED! (%s) line %d]\\n",
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safe_strerror (errno), line);
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}
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else
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{
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fprintf (procfs_file ? procfs_file : stdout,
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"%d = open (%s, ", ret, filename);
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if (mode == O_RDONLY)
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fprintf (procfs_file ? procfs_file : stdout, "O_RDONLY) %d\n",
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line);
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else if (mode == O_WRONLY)
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fprintf (procfs_file ? procfs_file : stdout, "O_WRONLY) %d\n",
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line);
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else if (mode == O_RDWR)
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fprintf (procfs_file ? procfs_file : stdout, "O_RDWR) %d\n",
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line);
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}
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if (procfs_file)
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fflush (procfs_file);
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}
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return ret;
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}
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int
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close_with_trace (int fd, char *file, int line)
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{
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int ret;
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prepare_to_trace ();
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errno = 0;
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ret = close (fd);
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if (procfs_trace)
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{
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if (info_verbose)
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fprintf (procfs_file ? procfs_file : stdout,
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"%s:%d -- ", file, line);
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if (errno)
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fprintf (procfs_file ? procfs_file : stdout,
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"[close FAILED! (%s)]\n", safe_strerror (errno));
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else
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fprintf (procfs_file ? procfs_file : stdout,
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"%d = close (%d)\n", ret, fd);
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if (procfs_file)
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fflush (procfs_file);
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}
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return ret;
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}
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pid_t
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wait_with_trace (int *wstat, char *file, int line)
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{
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int ret, lstat = 0;
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prepare_to_trace ();
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if (procfs_trace)
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{
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if (info_verbose)
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fprintf (procfs_file ? procfs_file : stdout,
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"%s:%d -- ", file, line);
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fprintf (procfs_file ? procfs_file : stdout,
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"wait (line %d) ", line);
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if (procfs_file)
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fflush (procfs_file);
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}
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errno = 0;
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ret = wait (&lstat);
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if (procfs_trace)
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{
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if (errno)
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fprintf (procfs_file ? procfs_file : stdout,
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"[wait FAILED! (%s)]\n", safe_strerror (errno));
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else
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fprintf (procfs_file ? procfs_file : stdout,
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"returned pid %d, status 0x%x\n", ret, lstat);
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if (procfs_file)
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fflush (procfs_file);
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}
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if (wstat)
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*wstat = lstat;
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return ret;
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}
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void
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procfs_note (const char *msg, const char *file, int line)
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{
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prepare_to_trace ();
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if (procfs_trace)
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{
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if (info_verbose)
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fprintf (procfs_file ? procfs_file : stdout,
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"%s:%d -- ", file, line);
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fprintf (procfs_file ? procfs_file : stdout, "%s", msg);
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if (procfs_file)
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fflush (procfs_file);
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}
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}
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void
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proc_prettyfprint_status (long flags, int why, int what, int thread)
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{
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prepare_to_trace ();
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if (procfs_trace)
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{
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if (thread)
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fprintf (procfs_file ? procfs_file : stdout,
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"Thread %d: ", thread);
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proc_prettyfprint_flags (procfs_file ? procfs_file : stdout,
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flags, 0);
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if (flags & (PR_STOPPED | PR_ISTOP))
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proc_prettyfprint_why (procfs_file ? procfs_file : stdout,
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why, what, 0);
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if (procfs_file)
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fflush (procfs_file);
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}
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}
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void _initialize_proc_api ();
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void
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_initialize_proc_api ()
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{
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add_setshow_boolean_cmd ("procfs-trace", no_class, &procfs_trace, _("\
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Set tracing for /proc api calls."), _("\
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Show tracing for /proc api calls."), NULL,
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set_procfs_trace_cmd,
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NULL, /* FIXME: i18n: */
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&setlist, &showlist);
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procfs_filename = xstrdup ("procfs_trace");
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add_setshow_filename_cmd ("procfs-file", no_class, &procfs_filename, _("\
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Set filename for /proc tracefile."), _("\
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Show filename for /proc tracefile."), NULL,
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set_procfs_file_cmd,
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NULL, /* FIXME: i18n: */
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&setlist, &showlist);
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}
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