88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* Native-dependent code for NetBSD/i386.
|
||
|
||
Copyright 2004, 2005 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 "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "target.h"
|
||
|
||
#include "i386-tdep.h"
|
||
#include "i386bsd-nat.h"
|
||
|
||
/* Support for debugging kernel virtual memory images. */
|
||
|
||
#include <sys/types.h>
|
||
#include <machine/frame.h>
|
||
#include <machine/pcb.h>
|
||
|
||
#include "bsd-kvm.h"
|
||
|
||
static int
|
||
i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
|
||
{
|
||
struct switchframe sf;
|
||
|
||
/* The following is true for NetBSD 1.6.2:
|
||
|
||
The pcb contains %esp and %ebp at the point of the context switch
|
||
in cpu_switch(). At that point we have a stack frame as
|
||
described by `struct switchframe', which for NetBSD 1.6.2 has the
|
||
following layout:
|
||
|
||
interrupt level
|
||
%edi
|
||
%esi
|
||
%ebx
|
||
%eip
|
||
|
||
we reconstruct the register state as it would look when we just
|
||
returned from cpu_switch(). */
|
||
|
||
/* The stack pointer shouldn't be zero. */
|
||
if (pcb->pcb_esp == 0)
|
||
return 0;
|
||
|
||
read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf);
|
||
pcb->pcb_esp += sizeof (struct switchframe);
|
||
regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi);
|
||
regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi);
|
||
regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
|
||
regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
|
||
regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx);
|
||
regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);
|
||
|
||
return 1;
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_i386nbsd_nat (void);
|
||
|
||
void
|
||
_initialize_i386nbsd_nat (void)
|
||
{
|
||
/* We've got nothing to add to the common *BSD/i386 target. */
|
||
add_target (i386bsd_target ());
|
||
|
||
/* Support debugging kernel virtual memory images. */
|
||
bsd_kvm_add_target (i386nbsd_supply_pcb);
|
||
}
|