85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
|
/* Target-dependent code for i386 BSD's.
|
||
|
|
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 "frame.h"
|
||
|
|
#include "gdbcore.h"
|
||
|
|
#include "regcache.h"
|
||
|
|
|
||
|
|
/* Support for signal handlers. */
|
||
|
|
|
||
|
|
/* Range in which to find the signaltramp routine, traditionally found
|
||
|
|
on the use stack, just below the user area. Initialized to values
|
||
|
|
that work for NetBSD and FreeBSD. */
|
||
|
|
|
||
|
|
CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20;
|
||
|
|
CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0;
|
||
|
|
|
||
|
|
/* Return whether PC is in a BSD sigtramp routine. */
|
||
|
|
|
||
|
|
int
|
||
|
|
i386bsd_in_sigtramp (CORE_ADDR pc, char *name)
|
||
|
|
{
|
||
|
|
return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Offset in the sigcontext structure of the program counter.
|
||
|
|
Initialized to the value from 4.4 BSD Lite. */
|
||
|
|
int i386bsd_sigcontext_pc_offset = 20;
|
||
|
|
|
||
|
|
/* Assuming FRAME is for a BSD sigtramp routine, return the address of
|
||
|
|
the associated sigcontext structure. */
|
||
|
|
|
||
|
|
static CORE_ADDR
|
||
|
|
i386bsd_sigcontext_addr (struct frame_info *frame)
|
||
|
|
{
|
||
|
|
if (frame->next)
|
||
|
|
/* If this isn't the top frame, the next frame must be for the
|
||
|
|
signal handler itself. A pointer to the sigcontext structure
|
||
|
|
is passed as the third argument to the signal handler. */
|
||
|
|
return read_memory_unsigned_integer (frame->next->frame + 16, 4);
|
||
|
|
|
||
|
|
/* This is the top frame. We'll have to find the address of the
|
||
|
|
sigcontext structure by looking at the stack pointer. */
|
||
|
|
return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Assuming FRAME is for a BSD sigtramp routine, return the saved
|
||
|
|
program counter. */
|
||
|
|
|
||
|
|
static CORE_ADDR
|
||
|
|
i386bsd_sigtramp_saved_pc (struct frame_info *frame)
|
||
|
|
{
|
||
|
|
CORE_ADDR addr;
|
||
|
|
addr = i386bsd_sigcontext_addr (frame);
|
||
|
|
return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Return the saved program counter for FRAME. */
|
||
|
|
|
||
|
|
CORE_ADDR
|
||
|
|
i386bsd_frame_saved_pc (struct frame_info *frame)
|
||
|
|
{
|
||
|
|
if (frame->signal_handler_caller)
|
||
|
|
return i386bsd_sigtramp_saved_pc (frame);
|
||
|
|
|
||
|
|
return read_memory_unsigned_integer (frame->frame + 4, 4);
|
||
|
|
}
|