148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/* Native-dependent code for OpenBSD/amd64.
|
||
|
||
Copyright (C) 2003, 2004 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., 51 Franklin Street, Fifth Floor,
|
||
Boston, MA 02110-1301, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "target.h"
|
||
|
||
#include "gdb_assert.h"
|
||
|
||
#include "amd64-tdep.h"
|
||
#include "amd64-nat.h"
|
||
|
||
/* Mapping between the general-purpose registers in OpenBSD/amd64
|
||
`struct reg' format and GDB's register cache layout for
|
||
OpenBSD/i386.
|
||
|
||
Note that most (if not all) OpenBSD/amd64 registers are 64-bit,
|
||
while the OpenBSD/i386 registers are all 32-bit, but since we're
|
||
little-endian we get away with that. */
|
||
|
||
/* From <machine/reg.h>. */
|
||
static int amd64obsd32_r_reg_offset[] =
|
||
{
|
||
14 * 8, /* %eax */
|
||
3 * 8, /* %ecx */
|
||
2 * 8, /* %edx */
|
||
13 * 8, /* %ebx */
|
||
15 * 8, /* %esp */
|
||
12 * 8, /* %ebp */
|
||
1 * 8, /* %esi */
|
||
0 * 8, /* %edi */
|
||
16 * 8, /* %eip */
|
||
17 * 8, /* %eflags */
|
||
18 * 8, /* %cs */
|
||
19 * 8, /* %ss */
|
||
20 * 8, /* %ds */
|
||
21 * 8, /* %es */
|
||
22 * 8, /* %fs */
|
||
23 * 8 /* %gs */
|
||
};
|
||
|
||
|
||
/* 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
|
||
amd64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
|
||
{
|
||
struct switchframe sf;
|
||
int regnum;
|
||
|
||
/* The following is true for OpenBSD 3.5:
|
||
|
||
The pcb contains the stack pointer 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 OpenBSD 3.5 has the
|
||
following layout:
|
||
|
||
interrupt level
|
||
%r15
|
||
%r14
|
||
%r13
|
||
%r12
|
||
%rbp
|
||
%rbx
|
||
return address
|
||
|
||
Together with %rsp in the pcb, this accounts for all callee-saved
|
||
registers specified by the psABI. From this information we
|
||
reconstruct the register state as it would look when we just
|
||
returned from cpu_switch().
|
||
|
||
For core dumps the pcb is saved by savectx(). In that case the
|
||
stack frame only contains the return address, and there is no way
|
||
to recover the other registers. */
|
||
|
||
/* The stack pointer shouldn't be zero. */
|
||
if (pcb->pcb_rsp == 0)
|
||
return 0;
|
||
|
||
/* Read the stack frame, and check its validity. */
|
||
read_memory (pcb->pcb_rsp, (gdb_byte *) &sf, sizeof sf);
|
||
if (sf.sf_rbp == pcb->pcb_rbp)
|
||
{
|
||
/* Yes, we have a frame that matches cpu_switch(). */
|
||
pcb->pcb_rsp += sizeof (struct switchframe);
|
||
regcache_raw_supply (regcache, 12, &sf.sf_r12);
|
||
regcache_raw_supply (regcache, 13, &sf.sf_r13);
|
||
regcache_raw_supply (regcache, 14, &sf.sf_r14);
|
||
regcache_raw_supply (regcache, 15, &sf.sf_r15);
|
||
regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &sf.sf_rbx);
|
||
regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &sf.sf_rip);
|
||
}
|
||
else
|
||
{
|
||
/* No, the pcb must have been last updated by savectx(). */
|
||
pcb->pcb_rsp += 8;
|
||
regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &sf);
|
||
}
|
||
|
||
regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
|
||
regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
|
||
|
||
return 1;
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_amd64obsd_nat (void);
|
||
|
||
void
|
||
_initialize_amd64obsd_nat (void)
|
||
{
|
||
amd64_native_gregset32_reg_offset = amd64obsd32_r_reg_offset;
|
||
amd64_native_gregset32_num_regs = ARRAY_SIZE (amd64obsd32_r_reg_offset);
|
||
amd64_native_gregset64_reg_offset = amd64obsd_r_reg_offset;
|
||
|
||
/* We've got nothing to add to the common *BSD/amd64 target. */
|
||
add_target (amd64bsd_target ());
|
||
|
||
/* Support debugging kernel virtual memory images. */
|
||
bsd_kvm_add_target (amd64obsd_supply_pcb);
|
||
}
|