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https://sourceware.org/git/binutils-gdb.git
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d83ad864a2
This patch reorganizes the code that implements follow-fork and detach-on-fork in preparation for implementation of those features for the extended-remote target. The function linux-nat.c:linux_child_follow_fork contained target-independent code mixed in with target-dependent code. The target-independent pieces need to be accessible for the host-side implementation of follow-fork for extended-remote Linux targets. The changes are fairly mechanical. A new routine, follow_fork_inferior, is implemented in infrun.c, containing those parts of linux_child_follow_fork that manage inferiors and the inferior list. The parts of linux_child_follow_fork that deal with LWPs and target-specifics were left in-place. Although the order of some operations was changed, the resulting functionality was not. Modifications were made to the other native target follow-fork functions, inf_ttrace_follow_fork and inf_ptrace_follow_fork, that should allow them to work with follow_fork_inferior. Some other adjustments were necessary in inf-ttrace.c. The changes to inf-ttrace.c and inf-ptrace.c were not tested. gdb/ChangeLog: * inf-ptrace.c (inf_ptrace_follow_fork): Remove target-independent code so as to work with follow_fork_inferior. * inf-ttrace.c (inf_ttrace_follow_fork): Ditto. (inf_ttrace_create_inferior): Remove reference to inf_ttrace_vfork_ppid. (inf_ttrace_attach): Ditto. (inf_ttrace_detach): Ditto. (inf_ttrace_kill): Use current_inferior instead of inf_ttrace_vfork_ppid. (inf_ttrace_wait): Eliminate use of inf_ttrace_vfork_ppid, report TARGET_WAITKIND_VFORK_DONE event, delete HACK that switched the inferior away from the parent. * infrun.c (follow_fork): Call follow_fork_inferior instead of target_follow_fork. (follow_fork_inferior): New function. (follow_inferior_reset_breakpoints): Make function static. * infrun.h (follow_inferior_reset_breakpoints): Remove declaration. * linux-nat.c (linux_child_follow_fork): Move target-independent code to infrun.c:follow_fork_inferior.
1225 lines
34 KiB
C
1225 lines
34 KiB
C
/* Low-level child interface to ttrace.
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Copyright (C) 2004-2014 Free Software Foundation, Inc.
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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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#include "defs.h"
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/* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't
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try to compile this code unless we have it. */
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#ifdef HAVE_TTRACE
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#include "command.h"
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#include "gdbcore.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "terminal.h"
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#include "target.h"
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#include <sys/mman.h>
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#include <sys/ttrace.h>
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#include <signal.h>
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#include "inf-child.h"
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#include "inf-ttrace.h"
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#include "common/filestuff.h"
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/* HP-UX uses a threading model where each user-space thread
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corresponds to a kernel thread. These kernel threads are called
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lwps. The ttrace(2) interface gives us almost full control over
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the threads, which makes it very easy to support them in GDB. We
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identify the threads by process ID and lwp ID. The ttrace(2) also
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provides us with a thread's user ID (in the `tts_user_tid' member
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of `ttstate_t') but we don't use that (yet) as it isn't necessary
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to uniquely label the thread. */
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/* Number of active lwps. */
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static int inf_ttrace_num_lwps;
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/* On HP-UX versions that have the ttrace(2) system call, we can
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implement "hardware" watchpoints by fiddling with the protection of
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pages in the address space that contain the variable being watched.
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In order to implement this, we keep a dictionary of pages for which
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we have changed the protection. */
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struct inf_ttrace_page
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{
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CORE_ADDR addr; /* Page address. */
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int prot; /* Protection. */
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int refcount; /* Reference count. */
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struct inf_ttrace_page *next;
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struct inf_ttrace_page *prev;
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};
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struct inf_ttrace_page_dict
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{
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struct inf_ttrace_page buckets[128];
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int pagesize; /* Page size. */
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int count; /* Number of pages in this dictionary. */
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} inf_ttrace_page_dict;
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struct inf_ttrace_private_thread_info
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{
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int dying;
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};
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/* Number of lwps that are currently in a system call. */
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static int inf_ttrace_num_lwps_in_syscall;
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/* Flag to indicate whether we should re-enable page protections after
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the next wait. */
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static int inf_ttrace_reenable_page_protections;
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/* Enable system call events for process PID. */
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static void
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inf_ttrace_enable_syscall_events (pid_t pid)
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{
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ttevent_t tte;
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ttstate_t tts;
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gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
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if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0,
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(uintptr_t)&tte, sizeof tte, 0) == -1)
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perror_with_name (("ttrace"));
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tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN);
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if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
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(uintptr_t)&tte, sizeof tte, 0) == -1)
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perror_with_name (("ttrace"));
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if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0,
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(uintptr_t)&tts, sizeof tts, 0) == -1)
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perror_with_name (("ttrace"));
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if (tts.tts_flags & TTS_INSYSCALL)
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inf_ttrace_num_lwps_in_syscall++;
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/* FIXME: Handle multiple threads. */
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}
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/* Disable system call events for process PID. */
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static void
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inf_ttrace_disable_syscall_events (pid_t pid)
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{
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ttevent_t tte;
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gdb_assert (inf_ttrace_page_dict.count == 0);
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if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0,
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(uintptr_t)&tte, sizeof tte, 0) == -1)
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perror_with_name (("ttrace"));
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tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN);
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if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
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(uintptr_t)&tte, sizeof tte, 0) == -1)
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perror_with_name (("ttrace"));
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inf_ttrace_num_lwps_in_syscall = 0;
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}
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/* Get information about the page at address ADDR for process PID from
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the dictionary. */
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static struct inf_ttrace_page *
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inf_ttrace_get_page (pid_t pid, CORE_ADDR addr)
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{
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const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
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const int pagesize = inf_ttrace_page_dict.pagesize;
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int bucket;
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struct inf_ttrace_page *page;
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bucket = (addr / pagesize) % num_buckets;
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page = &inf_ttrace_page_dict.buckets[bucket];
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while (page)
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{
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if (page->addr == addr)
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break;
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page = page->next;
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}
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return page;
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}
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/* Add the page at address ADDR for process PID to the dictionary. */
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static struct inf_ttrace_page *
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inf_ttrace_add_page (pid_t pid, CORE_ADDR addr)
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{
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const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
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const int pagesize = inf_ttrace_page_dict.pagesize;
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int bucket;
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struct inf_ttrace_page *page;
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struct inf_ttrace_page *prev = NULL;
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bucket = (addr / pagesize) % num_buckets;
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page = &inf_ttrace_page_dict.buckets[bucket];
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while (page)
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{
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if (page->addr == addr)
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break;
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prev = page;
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page = page->next;
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}
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if (!page)
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{
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int prot;
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if (ttrace (TT_PROC_GET_MPROTECT, pid, 0,
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addr, 0, (uintptr_t)&prot) == -1)
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perror_with_name (("ttrace"));
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page = XNEW (struct inf_ttrace_page);
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page->addr = addr;
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page->prot = prot;
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page->refcount = 0;
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page->next = NULL;
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page->prev = prev;
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prev->next = page;
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inf_ttrace_page_dict.count++;
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if (inf_ttrace_page_dict.count == 1)
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inf_ttrace_enable_syscall_events (pid);
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if (inf_ttrace_num_lwps_in_syscall == 0)
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{
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if (ttrace (TT_PROC_SET_MPROTECT, pid, 0,
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addr, pagesize, prot & ~PROT_WRITE) == -1)
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perror_with_name (("ttrace"));
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}
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}
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return page;
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}
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/* Insert the page at address ADDR of process PID to the dictionary. */
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static void
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inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr)
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{
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struct inf_ttrace_page *page;
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page = inf_ttrace_get_page (pid, addr);
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if (!page)
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page = inf_ttrace_add_page (pid, addr);
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page->refcount++;
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}
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/* Remove the page at address ADDR of process PID from the dictionary. */
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static void
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inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr)
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{
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const int pagesize = inf_ttrace_page_dict.pagesize;
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struct inf_ttrace_page *page;
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page = inf_ttrace_get_page (pid, addr);
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page->refcount--;
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gdb_assert (page->refcount >= 0);
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if (page->refcount == 0)
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{
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if (inf_ttrace_num_lwps_in_syscall == 0)
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{
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if (ttrace (TT_PROC_SET_MPROTECT, pid, 0,
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addr, pagesize, page->prot) == -1)
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perror_with_name (("ttrace"));
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}
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inf_ttrace_page_dict.count--;
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if (inf_ttrace_page_dict.count == 0)
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inf_ttrace_disable_syscall_events (pid);
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page->prev->next = page->next;
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if (page->next)
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page->next->prev = page->prev;
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xfree (page);
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}
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}
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/* Mask the bits in PROT from the page protections that are currently
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in the dictionary for process PID. */
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static void
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inf_ttrace_mask_page_protections (pid_t pid, int prot)
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{
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const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
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const int pagesize = inf_ttrace_page_dict.pagesize;
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int bucket;
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for (bucket = 0; bucket < num_buckets; bucket++)
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{
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struct inf_ttrace_page *page;
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page = inf_ttrace_page_dict.buckets[bucket].next;
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while (page)
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{
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if (ttrace (TT_PROC_SET_MPROTECT, pid, 0,
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page->addr, pagesize, page->prot & ~prot) == -1)
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perror_with_name (("ttrace"));
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page = page->next;
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}
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}
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}
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/* Write-protect the pages in the dictionary for process PID. */
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static void
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inf_ttrace_enable_page_protections (pid_t pid)
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{
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inf_ttrace_mask_page_protections (pid, PROT_WRITE);
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}
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/* Restore the protection of the pages in the dictionary for process
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PID. */
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static void
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inf_ttrace_disable_page_protections (pid_t pid)
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{
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inf_ttrace_mask_page_protections (pid, 0);
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}
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/* Insert a "hardware" watchpoint for LEN bytes at address ADDR of
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type TYPE. */
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static int
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inf_ttrace_insert_watchpoint (struct target_ops *self,
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CORE_ADDR addr, int len, int type,
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struct expression *cond)
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{
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const int pagesize = inf_ttrace_page_dict.pagesize;
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pid_t pid = ptid_get_pid (inferior_ptid);
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CORE_ADDR page_addr;
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int num_pages;
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int page;
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gdb_assert (type == hw_write);
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page_addr = (addr / pagesize) * pagesize;
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num_pages = (len + pagesize - 1) / pagesize;
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for (page = 0; page < num_pages; page++, page_addr += pagesize)
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inf_ttrace_insert_page (pid, page_addr);
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return 1;
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}
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/* Remove a "hardware" watchpoint for LEN bytes at address ADDR of
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type TYPE. */
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static int
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inf_ttrace_remove_watchpoint (struct target_ops *self,
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CORE_ADDR addr, int len, int type,
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struct expression *cond)
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{
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const int pagesize = inf_ttrace_page_dict.pagesize;
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pid_t pid = ptid_get_pid (inferior_ptid);
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CORE_ADDR page_addr;
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int num_pages;
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int page;
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gdb_assert (type == hw_write);
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page_addr = (addr / pagesize) * pagesize;
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num_pages = (len + pagesize - 1) / pagesize;
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for (page = 0; page < num_pages; page++, page_addr += pagesize)
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inf_ttrace_remove_page (pid, page_addr);
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return 1;
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}
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static int
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inf_ttrace_can_use_hw_breakpoint (struct target_ops *self,
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int type, int len, int ot)
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{
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return (type == bp_hardware_watchpoint);
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}
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static int
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inf_ttrace_region_ok_for_hw_watchpoint (struct target_ops *self,
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CORE_ADDR addr, int len)
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{
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return 1;
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}
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/* Return non-zero if the current inferior was (potentially) stopped
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by hitting a "hardware" watchpoint. */
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static int
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inf_ttrace_stopped_by_watchpoint (struct target_ops *ops)
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{
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pid_t pid = ptid_get_pid (inferior_ptid);
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lwpid_t lwpid = ptid_get_lwp (inferior_ptid);
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ttstate_t tts;
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if (inf_ttrace_page_dict.count > 0)
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{
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if (ttrace (TT_LWP_GET_STATE, pid, lwpid,
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(uintptr_t)&tts, sizeof tts, 0) == -1)
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perror_with_name (("ttrace"));
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if (tts.tts_event == TTEVT_SIGNAL
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&& tts.tts_u.tts_signal.tts_signo == SIGBUS)
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{
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const int pagesize = inf_ttrace_page_dict.pagesize;
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void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr;
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CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize;
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if (inf_ttrace_get_page (pid, page_addr))
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return 1;
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}
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}
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return 0;
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}
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/* Target hook for follow_fork. On entry and at return inferior_ptid
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is the ptid of the followed inferior. */
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static int
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inf_ttrace_follow_fork (struct target_ops *ops, int follow_child,
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int detach_fork)
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{
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struct thread_info *tp = inferior_thread ();
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gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED
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|| tp->pending_follow.kind == TARGET_WAITKIND_VFORKED);
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if (follow_child)
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{
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struct thread_info *ti;
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/* The child will start out single-threaded. */
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inf_ttrace_num_lwps = 1;
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inf_ttrace_num_lwps_in_syscall = 0;
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ti = inferior_thread ();
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ti->private =
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xmalloc (sizeof (struct inf_ttrace_private_thread_info));
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memset (ti->private, 0,
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sizeof (struct inf_ttrace_private_thread_info));
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}
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else
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{
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pid_t child_pid;
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/* Following parent. Detach child now. */
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child_pid = ptid_get_pid (tp->pending_follow.value.related_pid);
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if (ttrace (TT_PROC_DETACH, child_pid, 0, 0, 0, 0) == -1)
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perror_with_name (("ttrace"));
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}
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return 0;
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}
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/* File descriptors for pipes used as semaphores during initial
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startup of an inferior. */
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static int inf_ttrace_pfd1[2];
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static int inf_ttrace_pfd2[2];
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static void
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do_cleanup_pfds (void *dummy)
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{
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close (inf_ttrace_pfd1[0]);
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close (inf_ttrace_pfd1[1]);
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close (inf_ttrace_pfd2[0]);
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close (inf_ttrace_pfd2[1]);
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unmark_fd_no_cloexec (inf_ttrace_pfd1[0]);
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unmark_fd_no_cloexec (inf_ttrace_pfd1[1]);
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unmark_fd_no_cloexec (inf_ttrace_pfd2[0]);
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unmark_fd_no_cloexec (inf_ttrace_pfd2[1]);
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}
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static void
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inf_ttrace_prepare (void)
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{
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if (pipe (inf_ttrace_pfd1) == -1)
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perror_with_name (("pipe"));
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|
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if (pipe (inf_ttrace_pfd2) == -1)
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{
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close (inf_ttrace_pfd1[0]);
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close (inf_ttrace_pfd2[0]);
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perror_with_name (("pipe"));
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}
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mark_fd_no_cloexec (inf_ttrace_pfd1[0]);
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mark_fd_no_cloexec (inf_ttrace_pfd1[1]);
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mark_fd_no_cloexec (inf_ttrace_pfd2[0]);
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mark_fd_no_cloexec (inf_ttrace_pfd2[1]);
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}
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/* Prepare to be traced. */
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static void
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inf_ttrace_me (void)
|
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{
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struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0);
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char c;
|
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|
||
/* "Trace me, Dr. Memory!" */
|
||
if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
|
||
/* Tell our parent that we are ready to be traced. */
|
||
if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c)
|
||
perror_with_name (("write"));
|
||
|
||
/* Wait until our parent has set the initial event mask. */
|
||
if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c)
|
||
perror_with_name (("read"));
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
|
||
/* Start tracing PID. */
|
||
|
||
static void
|
||
inf_ttrace_him (struct target_ops *ops, int pid)
|
||
{
|
||
struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0);
|
||
ttevent_t tte;
|
||
char c;
|
||
|
||
/* Wait until our child is ready to be traced. */
|
||
if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c)
|
||
perror_with_name (("read"));
|
||
|
||
/* Set the initial event mask. */
|
||
memset (&tte, 0, sizeof (tte));
|
||
tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK;
|
||
tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE;
|
||
#ifdef TTEVT_BPT_SSTEP
|
||
tte.tte_events |= TTEVT_BPT_SSTEP;
|
||
#endif
|
||
tte.tte_opts |= TTEO_PROC_INHERIT;
|
||
if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
|
||
(uintptr_t)&tte, sizeof tte, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
|
||
/* Tell our child that we have set the initial event mask. */
|
||
if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c)
|
||
perror_with_name (("write"));
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
if (!target_is_pushed (ops))
|
||
push_target (ops);
|
||
|
||
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
|
||
|
||
/* On some targets, there must be some explicit actions taken after
|
||
the inferior has been started up. */
|
||
target_post_startup_inferior (pid_to_ptid (pid));
|
||
}
|
||
|
||
static void
|
||
inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file,
|
||
char *allargs, char **env, int from_tty)
|
||
{
|
||
int pid;
|
||
|
||
gdb_assert (inf_ttrace_num_lwps == 0);
|
||
gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
|
||
gdb_assert (inf_ttrace_page_dict.count == 0);
|
||
gdb_assert (inf_ttrace_reenable_page_protections == 0);
|
||
|
||
pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL,
|
||
inf_ttrace_prepare, NULL, NULL);
|
||
|
||
inf_ttrace_him (ops, pid);
|
||
}
|
||
|
||
static void
|
||
inf_ttrace_mourn_inferior (struct target_ops *ops)
|
||
{
|
||
const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets);
|
||
int bucket;
|
||
|
||
inf_ttrace_num_lwps = 0;
|
||
inf_ttrace_num_lwps_in_syscall = 0;
|
||
|
||
for (bucket = 0; bucket < num_buckets; bucket++)
|
||
{
|
||
struct inf_ttrace_page *page;
|
||
struct inf_ttrace_page *next;
|
||
|
||
page = inf_ttrace_page_dict.buckets[bucket].next;
|
||
while (page)
|
||
{
|
||
next = page->next;
|
||
xfree (page);
|
||
page = next;
|
||
}
|
||
}
|
||
inf_ttrace_page_dict.count = 0;
|
||
|
||
inf_child_mourn_inferior (ops);
|
||
}
|
||
|
||
/* Assuming we just attached the debugger to a new inferior, create
|
||
a new thread_info structure for each thread, and add it to our
|
||
list of threads. */
|
||
|
||
static void
|
||
inf_ttrace_create_threads_after_attach (int pid)
|
||
{
|
||
int status;
|
||
ptid_t ptid;
|
||
ttstate_t tts;
|
||
struct thread_info *ti;
|
||
|
||
status = ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0,
|
||
(uintptr_t) &tts, sizeof (ttstate_t), 0);
|
||
if (status < 0)
|
||
perror_with_name (_("TT_PROC_GET_FIRST_LWP_STATE ttrace call failed"));
|
||
gdb_assert (tts.tts_pid == pid);
|
||
|
||
/* Add the stopped thread. */
|
||
ptid = ptid_build (pid, tts.tts_lwpid, 0);
|
||
ti = add_thread (ptid);
|
||
ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info));
|
||
inf_ttrace_num_lwps++;
|
||
|
||
/* We use the "first stopped thread" as the currently active thread. */
|
||
inferior_ptid = ptid;
|
||
|
||
/* Iterative over all the remaining threads. */
|
||
|
||
for (;;)
|
||
{
|
||
ptid_t ptid;
|
||
|
||
status = ttrace (TT_PROC_GET_NEXT_LWP_STATE, pid, 0,
|
||
(uintptr_t) &tts, sizeof (ttstate_t), 0);
|
||
if (status < 0)
|
||
perror_with_name (_("TT_PROC_GET_NEXT_LWP_STATE ttrace call failed"));
|
||
if (status == 0)
|
||
break; /* End of list. */
|
||
|
||
ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
|
||
ti = add_thread (ptid);
|
||
ti->private = xzalloc (sizeof (struct inf_ttrace_private_thread_info));
|
||
inf_ttrace_num_lwps++;
|
||
}
|
||
}
|
||
|
||
static void
|
||
inf_ttrace_attach (struct target_ops *ops, const char *args, int from_tty)
|
||
{
|
||
char *exec_file;
|
||
pid_t pid;
|
||
ttevent_t tte;
|
||
struct inferior *inf;
|
||
|
||
pid = parse_pid_to_attach (args);
|
||
|
||
if (pid == getpid ()) /* Trying to masturbate? */
|
||
error (_("I refuse to debug myself!"));
|
||
|
||
if (from_tty)
|
||
{
|
||
exec_file = get_exec_file (0);
|
||
|
||
if (exec_file)
|
||
printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file,
|
||
target_pid_to_str (pid_to_ptid (pid)));
|
||
else
|
||
printf_unfiltered (_("Attaching to %s\n"),
|
||
target_pid_to_str (pid_to_ptid (pid)));
|
||
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
|
||
gdb_assert (inf_ttrace_num_lwps == 0);
|
||
gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
|
||
|
||
if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
|
||
inf = current_inferior ();
|
||
inferior_appeared (inf, pid);
|
||
inf->attach_flag = 1;
|
||
|
||
/* Set the initial event mask. */
|
||
memset (&tte, 0, sizeof (tte));
|
||
tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK;
|
||
tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE;
|
||
#ifdef TTEVT_BPT_SSTEP
|
||
tte.tte_events |= TTEVT_BPT_SSTEP;
|
||
#endif
|
||
tte.tte_opts |= TTEO_PROC_INHERIT;
|
||
if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0,
|
||
(uintptr_t)&tte, sizeof tte, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
|
||
if (!target_is_pushed (ops))
|
||
push_target (ops);
|
||
|
||
inf_ttrace_create_threads_after_attach (pid);
|
||
}
|
||
|
||
static void
|
||
inf_ttrace_detach (struct target_ops *ops, const char *args, int from_tty)
|
||
{
|
||
pid_t pid = ptid_get_pid (inferior_ptid);
|
||
int sig = 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 (pid_to_ptid (pid)));
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
if (args)
|
||
sig = atoi (args);
|
||
|
||
/* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we
|
||
can pass a signal number here. Does this really work? */
|
||
if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
|
||
inf_ttrace_num_lwps = 0;
|
||
inf_ttrace_num_lwps_in_syscall = 0;
|
||
|
||
inferior_ptid = null_ptid;
|
||
detach_inferior (pid);
|
||
|
||
inf_child_maybe_unpush_target (ops);
|
||
}
|
||
|
||
static void
|
||
inf_ttrace_kill (struct target_ops *ops)
|
||
{
|
||
pid_t pid = ptid_get_pid (inferior_ptid);
|
||
|
||
if (pid == 0)
|
||
return;
|
||
|
||
if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
/* ??? Is it necessary to call ttrace_wait() here? */
|
||
|
||
target_mourn_inferior ();
|
||
}
|
||
|
||
/* Check is a dying thread is dead by now, and delete it from GDBs
|
||
thread list if so. */
|
||
static int
|
||
inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg)
|
||
{
|
||
lwpid_t lwpid;
|
||
struct inf_ttrace_private_thread_info *p;
|
||
|
||
if (is_exited (info->ptid))
|
||
return 0;
|
||
|
||
lwpid = ptid_get_lwp (info->ptid);
|
||
p = (struct inf_ttrace_private_thread_info *) info->private;
|
||
|
||
/* Check if an lwp that was dying is still there or not. */
|
||
if (p->dying && (kill (lwpid, 0) == -1))
|
||
/* It's gone now. */
|
||
delete_thread (info->ptid);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal
|
||
SIG. */
|
||
|
||
static void
|
||
inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig)
|
||
{
|
||
pid_t pid = ptid_get_pid (info->ptid);
|
||
lwpid_t lwpid = ptid_get_lwp (info->ptid);
|
||
|
||
if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1)
|
||
{
|
||
struct inf_ttrace_private_thread_info *p
|
||
= (struct inf_ttrace_private_thread_info *) info->private;
|
||
if (p->dying && errno == EPROTO)
|
||
/* This is expected, it means the dying lwp is really gone
|
||
by now. If ttrace had an event to inform the debugger
|
||
the lwp is really gone, this wouldn't be needed. */
|
||
delete_thread (info->ptid);
|
||
else
|
||
/* This was really unexpected. */
|
||
perror_with_name (("ttrace"));
|
||
}
|
||
}
|
||
|
||
/* Callback for iterate_over_threads. */
|
||
|
||
static int
|
||
inf_ttrace_resume_callback (struct thread_info *info, void *arg)
|
||
{
|
||
if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid))
|
||
inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
inf_ttrace_resume (struct target_ops *ops,
|
||
ptid_t ptid, int step, enum gdb_signal signal)
|
||
{
|
||
int resume_all;
|
||
ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE;
|
||
int sig = gdb_signal_to_host (signal);
|
||
struct thread_info *info;
|
||
|
||
/* A specific PTID means `step only this process id'. */
|
||
resume_all = (ptid_equal (ptid, minus_one_ptid));
|
||
|
||
/* If resuming all threads, it's the current thread that should be
|
||
handled specially. */
|
||
if (resume_all)
|
||
ptid = inferior_ptid;
|
||
|
||
info = find_thread_ptid (ptid);
|
||
inf_ttrace_resume_lwp (info, request, sig);
|
||
|
||
if (resume_all)
|
||
/* Let all the other threads run too. */
|
||
iterate_over_threads (inf_ttrace_resume_callback, NULL);
|
||
}
|
||
|
||
static ptid_t
|
||
inf_ttrace_wait (struct target_ops *ops,
|
||
ptid_t ptid, struct target_waitstatus *ourstatus, int options)
|
||
{
|
||
pid_t pid = ptid_get_pid (ptid);
|
||
lwpid_t lwpid = ptid_get_lwp (ptid);
|
||
ttstate_t tts;
|
||
struct thread_info *ti;
|
||
ptid_t related_ptid;
|
||
|
||
/* Until proven otherwise. */
|
||
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
||
|
||
if (pid == -1)
|
||
pid = lwpid = 0;
|
||
|
||
gdb_assert (pid != 0 || lwpid == 0);
|
||
|
||
do
|
||
{
|
||
set_sigint_trap ();
|
||
|
||
if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1)
|
||
perror_with_name (("ttrace_wait"));
|
||
|
||
clear_sigint_trap ();
|
||
}
|
||
while (tts.tts_event == TTEVT_NONE);
|
||
|
||
/* Now that we've waited, we can re-enable the page protections. */
|
||
if (inf_ttrace_reenable_page_protections)
|
||
{
|
||
gdb_assert (inf_ttrace_num_lwps_in_syscall == 0);
|
||
inf_ttrace_enable_page_protections (tts.tts_pid);
|
||
inf_ttrace_reenable_page_protections = 0;
|
||
}
|
||
|
||
ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
|
||
|
||
if (inf_ttrace_num_lwps == 0)
|
||
{
|
||
struct thread_info *ti;
|
||
|
||
inf_ttrace_num_lwps = 1;
|
||
|
||
/* This is the earliest we hear about the lwp member of
|
||
INFERIOR_PTID, after an attach or fork_inferior. */
|
||
gdb_assert (ptid_get_lwp (inferior_ptid) == 0);
|
||
|
||
/* We haven't set the private member on the main thread yet. Do
|
||
it now. */
|
||
ti = find_thread_ptid (inferior_ptid);
|
||
gdb_assert (ti != NULL && ti->private == NULL);
|
||
ti->private =
|
||
xmalloc (sizeof (struct inf_ttrace_private_thread_info));
|
||
memset (ti->private, 0,
|
||
sizeof (struct inf_ttrace_private_thread_info));
|
||
|
||
/* Notify the core that this ptid changed. This changes
|
||
inferior_ptid as well. */
|
||
thread_change_ptid (inferior_ptid, ptid);
|
||
}
|
||
|
||
switch (tts.tts_event)
|
||
{
|
||
#ifdef TTEVT_BPT_SSTEP
|
||
case TTEVT_BPT_SSTEP:
|
||
/* Make it look like a breakpoint. */
|
||
ourstatus->kind = TARGET_WAITKIND_STOPPED;
|
||
ourstatus->value.sig = GDB_SIGNAL_TRAP;
|
||
break;
|
||
#endif
|
||
|
||
case TTEVT_EXEC:
|
||
ourstatus->kind = TARGET_WAITKIND_EXECD;
|
||
ourstatus->value.execd_pathname =
|
||
xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1);
|
||
if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0,
|
||
(uintptr_t)ourstatus->value.execd_pathname,
|
||
tts.tts_u.tts_exec.tts_pathlen, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0;
|
||
|
||
/* At this point, all inserted breakpoints are gone. Doing this
|
||
as soon as we detect an exec prevents the badness of deleting
|
||
a breakpoint writing the current "shadow contents" to lift
|
||
the bp. That shadow is NOT valid after an exec. */
|
||
mark_breakpoints_out ();
|
||
break;
|
||
|
||
case TTEVT_EXIT:
|
||
store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode);
|
||
inf_ttrace_num_lwps = 0;
|
||
break;
|
||
|
||
case TTEVT_FORK:
|
||
related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid,
|
||
tts.tts_u.tts_fork.tts_flwpid, 0);
|
||
|
||
ourstatus->kind = TARGET_WAITKIND_FORKED;
|
||
ourstatus->value.related_pid = related_ptid;
|
||
|
||
/* Make sure the other end of the fork is stopped too. */
|
||
if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid,
|
||
tts.tts_u.tts_fork.tts_flwpid,
|
||
TTRACE_WAITOK, &tts, sizeof tts) == -1)
|
||
perror_with_name (("ttrace_wait"));
|
||
|
||
gdb_assert (tts.tts_event == TTEVT_FORK);
|
||
if (tts.tts_u.tts_fork.tts_isparent)
|
||
{
|
||
related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid,
|
||
tts.tts_u.tts_fork.tts_flwpid, 0);
|
||
ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
|
||
ourstatus->value.related_pid = related_ptid;
|
||
}
|
||
break;
|
||
|
||
case TTEVT_VFORK:
|
||
if (tts.tts_u.tts_fork.tts_isparent)
|
||
ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
|
||
else
|
||
{
|
||
related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid,
|
||
tts.tts_u.tts_fork.tts_flwpid, 0);
|
||
|
||
ourstatus->kind = TARGET_WAITKIND_VFORKED;
|
||
ourstatus->value.related_pid = related_ptid;
|
||
}
|
||
break;
|
||
|
||
case TTEVT_LWP_CREATE:
|
||
lwpid = tts.tts_u.tts_thread.tts_target_lwpid;
|
||
ptid = ptid_build (tts.tts_pid, lwpid, 0);
|
||
ti = add_thread (ptid);
|
||
ti->private =
|
||
xmalloc (sizeof (struct inf_ttrace_private_thread_info));
|
||
memset (ti->private, 0,
|
||
sizeof (struct inf_ttrace_private_thread_info));
|
||
inf_ttrace_num_lwps++;
|
||
ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
|
||
/* Let the lwp_create-caller thread continue. */
|
||
ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid),
|
||
ptid_get_lwp (ptid), TT_NOPC, 0, 0);
|
||
/* Return without stopping the whole process. */
|
||
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
||
return ptid;
|
||
|
||
case TTEVT_LWP_EXIT:
|
||
if (print_thread_events)
|
||
printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid));
|
||
ti = find_thread_ptid (ptid);
|
||
gdb_assert (ti != NULL);
|
||
((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1;
|
||
inf_ttrace_num_lwps--;
|
||
/* Let the thread really exit. */
|
||
ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid),
|
||
ptid_get_lwp (ptid), TT_NOPC, 0, 0);
|
||
/* Return without stopping the whole process. */
|
||
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
||
return ptid;
|
||
|
||
case TTEVT_LWP_TERMINATE:
|
||
lwpid = tts.tts_u.tts_thread.tts_target_lwpid;
|
||
ptid = ptid_build (tts.tts_pid, lwpid, 0);
|
||
if (print_thread_events)
|
||
printf_unfiltered(_("[%s has been terminated]\n"),
|
||
target_pid_to_str (ptid));
|
||
ti = find_thread_ptid (ptid);
|
||
gdb_assert (ti != NULL);
|
||
((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1;
|
||
inf_ttrace_num_lwps--;
|
||
|
||
/* Resume the lwp_terminate-caller thread. */
|
||
ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0);
|
||
ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid),
|
||
ptid_get_lwp (ptid), TT_NOPC, 0, 0);
|
||
/* Return without stopping the whole process. */
|
||
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
||
return ptid;
|
||
|
||
case TTEVT_SIGNAL:
|
||
ourstatus->kind = TARGET_WAITKIND_STOPPED;
|
||
ourstatus->value.sig =
|
||
gdb_signal_from_host (tts.tts_u.tts_signal.tts_signo);
|
||
break;
|
||
|
||
case TTEVT_SYSCALL_ENTRY:
|
||
gdb_assert (inf_ttrace_reenable_page_protections == 0);
|
||
inf_ttrace_num_lwps_in_syscall++;
|
||
if (inf_ttrace_num_lwps_in_syscall == 1)
|
||
{
|
||
/* A thread has just entered a system call. Disable any
|
||
page protections as the kernel can't deal with them. */
|
||
inf_ttrace_disable_page_protections (tts.tts_pid);
|
||
}
|
||
ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY;
|
||
ourstatus->value.syscall_number = tts.tts_scno;
|
||
break;
|
||
|
||
case TTEVT_SYSCALL_RETURN:
|
||
if (inf_ttrace_num_lwps_in_syscall > 0)
|
||
{
|
||
/* If the last thread has just left the system call, this
|
||
would be a logical place to re-enable the page
|
||
protections, but that doesn't work. We can't re-enable
|
||
them until we've done another wait. */
|
||
inf_ttrace_reenable_page_protections =
|
||
(inf_ttrace_num_lwps_in_syscall == 1);
|
||
inf_ttrace_num_lwps_in_syscall--;
|
||
}
|
||
ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN;
|
||
ourstatus->value.syscall_number = tts.tts_scno;
|
||
break;
|
||
|
||
default:
|
||
gdb_assert (!"Unexpected ttrace event");
|
||
break;
|
||
}
|
||
|
||
/* Make sure all threads within the process are stopped. */
|
||
if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1)
|
||
perror_with_name (("ttrace"));
|
||
|
||
/* Now that the whole process is stopped, check if any dying thread
|
||
is really dead by now. If a dying thread is still alive, it will
|
||
be stopped too, and will still show up in `info threads', tagged
|
||
with "(Exiting)". We could make `info threads' prune dead
|
||
threads instead via inf_ttrace_thread_alive, but doing this here
|
||
has the advantage that a frontend is notificed sooner of thread
|
||
exits. Note that a dying lwp is still alive, it still has to be
|
||
resumed, like any other lwp. */
|
||
iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL);
|
||
|
||
return ptid;
|
||
}
|
||
|
||
/* Transfer LEN bytes from ADDR in the inferior's memory into READBUF,
|
||
and transfer LEN bytes from WRITEBUF into the inferior's memory at
|
||
ADDR. Either READBUF or WRITEBUF may be null, in which case the
|
||
corresponding transfer doesn't happen. Return the number of bytes
|
||
actually transferred (which may be zero if an error occurs). */
|
||
|
||
static LONGEST
|
||
inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len,
|
||
void *readbuf, const void *writebuf)
|
||
{
|
||
pid_t pid = ptid_get_pid (inferior_ptid);
|
||
|
||
/* HP-UX treats text space and data space differently. GDB however,
|
||
doesn't really know the difference. Therefore we try both. Try
|
||
text space before data space though because when we're writing
|
||
into text space the instruction cache might need to be flushed. */
|
||
|
||
if (readbuf
|
||
&& ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1
|
||
&& ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1)
|
||
return 0;
|
||
|
||
if (writebuf
|
||
&& ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1
|
||
&& ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1)
|
||
return 0;
|
||
|
||
return len;
|
||
}
|
||
|
||
static enum target_xfer_status
|
||
inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
switch (object)
|
||
{
|
||
case TARGET_OBJECT_MEMORY:
|
||
{
|
||
LONGEST val = inf_ttrace_xfer_memory (offset, len, readbuf, writebuf);
|
||
|
||
if (val == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
{
|
||
*xfered_len = (ULONGEST) val;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
|
||
case TARGET_OBJECT_UNWIND_TABLE:
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_AUXV:
|
||
return TARGET_XFER_E_IO;
|
||
|
||
case TARGET_OBJECT_WCOOKIE:
|
||
return TARGET_XFER_E_IO;
|
||
|
||
default:
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
}
|
||
|
||
/* Print status information about what we're accessing. */
|
||
|
||
static void
|
||
inf_ttrace_files_info (struct target_ops *ignore)
|
||
{
|
||
struct inferior *inf = current_inferior ();
|
||
printf_filtered (_("\tUsing the running image of %s %s.\n"),
|
||
inf->attach_flag ? "attached" : "child",
|
||
target_pid_to_str (inferior_ptid));
|
||
}
|
||
|
||
static int
|
||
inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
/* Return a string describing the state of the thread specified by
|
||
INFO. */
|
||
|
||
static char *
|
||
inf_ttrace_extra_thread_info (struct target_ops *self,
|
||
struct thread_info *info)
|
||
{
|
||
struct inf_ttrace_private_thread_info* private =
|
||
(struct inf_ttrace_private_thread_info *) info->private;
|
||
|
||
if (private != NULL && private->dying)
|
||
return "Exiting";
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static char *
|
||
inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
pid_t pid = ptid_get_pid (ptid);
|
||
lwpid_t lwpid = ptid_get_lwp (ptid);
|
||
static char buf[128];
|
||
|
||
if (lwpid == 0)
|
||
xsnprintf (buf, sizeof buf, "process %ld",
|
||
(long) pid);
|
||
else
|
||
xsnprintf (buf, sizeof buf, "process %ld, lwp %ld",
|
||
(long) pid, (long) lwpid);
|
||
return buf;
|
||
}
|
||
|
||
|
||
/* Implement the get_ada_task_ptid target_ops method. */
|
||
|
||
static ptid_t
|
||
inf_ttrace_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
|
||
{
|
||
return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0);
|
||
}
|
||
|
||
|
||
struct target_ops *
|
||
inf_ttrace_target (void)
|
||
{
|
||
struct target_ops *t = inf_child_target ();
|
||
|
||
t->to_attach = inf_ttrace_attach;
|
||
t->to_detach = inf_ttrace_detach;
|
||
t->to_resume = inf_ttrace_resume;
|
||
t->to_wait = inf_ttrace_wait;
|
||
t->to_files_info = inf_ttrace_files_info;
|
||
t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint;
|
||
t->to_insert_watchpoint = inf_ttrace_insert_watchpoint;
|
||
t->to_remove_watchpoint = inf_ttrace_remove_watchpoint;
|
||
t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint;
|
||
t->to_region_ok_for_hw_watchpoint =
|
||
inf_ttrace_region_ok_for_hw_watchpoint;
|
||
t->to_kill = inf_ttrace_kill;
|
||
t->to_create_inferior = inf_ttrace_create_inferior;
|
||
t->to_follow_fork = inf_ttrace_follow_fork;
|
||
t->to_mourn_inferior = inf_ttrace_mourn_inferior;
|
||
t->to_thread_alive = inf_ttrace_thread_alive;
|
||
t->to_extra_thread_info = inf_ttrace_extra_thread_info;
|
||
t->to_pid_to_str = inf_ttrace_pid_to_str;
|
||
t->to_xfer_partial = inf_ttrace_xfer_partial;
|
||
t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid;
|
||
|
||
return t;
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Prevent warning from -Wmissing-prototypes. */
|
||
void _initialize_inf_ttrace (void);
|
||
|
||
void
|
||
_initialize_inf_ttrace (void)
|
||
{
|
||
#ifdef HAVE_TTRACE
|
||
inf_ttrace_page_dict.pagesize = getpagesize();
|
||
#endif
|
||
}
|