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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [i386nbsd-nat.c] - Blame information for rev 157

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1 24 jeremybenn
/* Native-dependent code for NetBSD/i386.
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   Copyright (C) 2004, 2005, 2007, 2008 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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#include "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include "i386-tdep.h"
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#include "i386bsd-nat.h"
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/* Support for debugging kernel virtual memory images.  */
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#include <sys/types.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include "nbsd-nat.h"
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#include "bsd-kvm.h"
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static int
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i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
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{
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  struct switchframe sf;
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  /* The following is true for NetBSD 1.6.2:
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     The pcb contains %esp and %ebp at the point of the context switch
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     in cpu_switch().  At that point we have a stack frame as
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     described by `struct switchframe', which for NetBSD 1.6.2 has the
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     following layout:
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     interrupt level
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     %edi
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     %esi
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     %ebx
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     %eip
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     we reconstruct the register state as it would look when we just
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     returned from cpu_switch().  */
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  /* The stack pointer shouldn't be zero.  */
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  if (pcb->pcb_esp == 0)
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    return 0;
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  read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf);
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  pcb->pcb_esp += sizeof (struct switchframe);
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  regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi);
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  regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi);
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  regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
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  regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
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  regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx);
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  regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip);
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  return 1;
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}
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/* Provide a prototype to silence -Wmissing-prototypes.  */
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void _initialize_i386nbsd_nat (void);
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void
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_initialize_i386nbsd_nat (void)
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{
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  struct target_ops *t;
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  /* Add some extra features to the common *BSD/i386 target.  */
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  t = i386bsd_target ();
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  t->to_pid_to_exec_file = nbsd_pid_to_exec_file;
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  add_target (t);
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  /* Support debugging kernel virtual memory images.  */
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  bsd_kvm_add_target (i386nbsd_supply_pcb);
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}

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