mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-17 14:23:34 +08:00
256304449f
(_initialize_i386bsd_nat) [KERN_PS_STRINGS]: Move FreeBSD-specific code to ... * i386fbsd-nat.c: ... here. New file. * config/i386/fbsd.mh (NATDEPFILES): Add i386-fbsd.o. * config/i386/nm-fbsd.h (CHILD_RESUME): Define. * Makefile.in (ALLDEPFILES): Add i386fbsd-nat.c. (i386fbsd-nat.o): Add dependencies.
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/* Native-dependent code for FreeBSD/i386.
|
||
Copyright 2001 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "regcache.h"
|
||
|
||
#include <sys/types.h>
|
||
#include <sys/ptrace.h>
|
||
#include <sys/sysctl.h>
|
||
|
||
/* Prevent warning from -Wmissing-prototypes. */
|
||
void _initialize_i386fbsd_nat (void);
|
||
|
||
/* Resume execution of the inferior process.
|
||
If STEP is nonzero, single-step it.
|
||
If SIGNAL is nonzero, give it that signal. */
|
||
|
||
void
|
||
child_resume (ptid_t ptid, int step, enum target_signal signal)
|
||
{
|
||
pid_t pid = ptid_get_pid (ptid);
|
||
int request = PT_STEP;
|
||
|
||
if (pid == -1)
|
||
/* Resume all threads. This only gets used in the non-threaded
|
||
case, where "resume all threads" and "resume inferior_ptid" are
|
||
the same. */
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
if (!step)
|
||
{
|
||
unsigned int eflags;
|
||
|
||
/* Workaround for a bug in FreeBSD. Make sure that the trace
|
||
flag is off when doing a continue. There is a code path
|
||
through the kernel which leaves the flag set when it should
|
||
have been cleared. If a process has a signal pending (such
|
||
as SIGALRM) and we do a PT_STEP, the process never really has
|
||
a chance to run because the kernel needs to notify the
|
||
debugger that a signal is being sent. Therefore, the process
|
||
never goes through the kernel's trap() function which would
|
||
normally clear it. */
|
||
|
||
eflags = read_register (PS_REGNUM);
|
||
if (eflags & 0x0100)
|
||
write_register (PS_REGNUM, eflags & ~0x0100);
|
||
|
||
request = PT_CONTINUE;
|
||
}
|
||
|
||
/* An addres of (caddr_t) 1 tells ptrace to continue from where it
|
||
was. (If GDB wanted it to start some other way, we have already
|
||
written a new PC value to the child.) */
|
||
if (ptrace (request, pid, (caddr_t) 1,
|
||
target_signal_to_host (signal)) == -1)
|
||
perror_with_name ("ptrace");
|
||
}
|
||
|
||
void
|
||
_initialize_i386fbsd_nat (void)
|
||
{
|
||
/* FreeBSD provides a kern.ps_strings sysctl that we can use to
|
||
locate the sigtramp. That way we can still recognize a sigtramp
|
||
if it's location is changed in a new kernel. Of course this is
|
||
still based on the assumption that the sigtramp is placed
|
||
directly under the location where the program arguments and
|
||
environment can be found. */
|
||
#ifdef KERN_PS_STRINGS
|
||
{
|
||
int mib[2];
|
||
int ps_strings;
|
||
size_t len;
|
||
|
||
mib[0] = CTL_KERN;
|
||
mib[1] = KERN_PS_STRINGS;
|
||
len = sizeof (ps_strings);
|
||
if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
|
||
{
|
||
i386bsd_sigtramp_start = ps_strings - 128;
|
||
i386bsd_sigtramp_end = ps_strings;
|
||
}
|
||
}
|
||
#endif
|
||
}
|