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/* 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);
}
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