/* Native-dependent code for NetBSD/i386.
Copyright (C) 2004-2016 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 3 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, see . */
#include "defs.h"
#include "gdbcore.h"
#include "regcache.h"
#include "target.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "i386bsd-nat.h"
/* Support for debugging kernel virtual memory images. */
#include
#include
#include
#include
#include "nbsd-nat.h"
#include "bsd-kvm.h"
#ifndef HAVE_GREGSET_T
typedef struct reg gregset_t;
#endif
#ifndef HAVE_FPREGSET_T
typedef struct fpreg fpregset_t;
#endif
#include "gregset.h"
static int
i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
struct switchframe sf;
/* The following is true for NetBSD 1.6.2 and after:
The pcb contains %esp and %ebp at the point of the context switch
in cpu_switch()/cpu_switchto(). At that point we have a stack frame as
described by `struct switchframe', which for NetBSD (2.0 and later) has
the following layout:
%edi
%esi
%ebx
return address
we reconstruct the register state as it would look when we just
returned from cpu_switch()/cpu_switchto().
For core dumps the pcb is saved by savectx()/dumpsys() and contains the
stack pointer and frame pointer. A new dumpsys() fakes a switchframe
whereas older code isn't reliable so use an iffy heuristic to detect this
and use the frame pointer to recover enough state. */
/* The stack pointer shouldn't be zero. */
if (pcb->pcb_esp == 0)
return 0;
read_memory (pcb->pcb_esp, (gdb_byte *) &sf, sizeof sf);
if ( (unsigned long)sf.sf_eip >= (unsigned long)0xc0100000 )
{
/* Yes, we have a switchframe that matches cpu_switchto() or
the new dumpsys(). */
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);
}
else
{
CORE_ADDR pc, fp;
/* No, the pcb must have been last updated by savectx() in old
dumpsys(). Use the frame pointer to recover enough state. */
read_memory (pcb->pcb_ebp, (gdb_byte *) &fp, sizeof(fp));
read_memory (pcb->pcb_ebp + 4, (gdb_byte *) &pc, sizeof(pc));
regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_ebp);
regcache_raw_supply (regcache, I386_EBP_REGNUM, &fp);
regcache_raw_supply (regcache, I386_EIP_REGNUM, &pc);
}
return 1;
}
void
supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
{
i386bsd_supply_gregset (regcache, gregsetp);
}
/* Fill register REGNUM (if it is a general-purpose register) in
*GREGSETP with the value in GDB's register cache. If REGNUM is -1,
do this for all registers. */
void
fill_gregset (const struct regcache *regcache,
gregset_t *gregsetp, int regnum)
{
i386bsd_collect_gregset (regcache, gregsetp, regnum);
}
/* Transfering floating-point registers between GDB, inferiors and cores. */
/* Fill GDB's register cache with the floating-point and SSE register
values in *FPREGSETP. */
void
supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
{
i387_supply_fsave (regcache, -1, fpregsetp);
}
/* Fill register REGNUM (if it is a floating-point or SSE register) in
*FPREGSETP with the value in GDB's register cache. If REGNUM is
-1, do this for all registers. */
void
fill_fpregset (const struct regcache *regcache,
fpregset_t *fpregsetp, int regnum)
{
i387_collect_fsave (regcache, regnum, fpregsetp);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_i386nbsd_nat (void);
void
_initialize_i386nbsd_nat (void)
{
struct target_ops *t;
/* Add some extra features to the common *BSD/i386 target. */
t = i386bsd_target ();
t->to_pid_to_exec_file = nbsd_pid_to_exec_file;
add_target (t);
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (i386nbsd_supply_pcb);
}