234 lines
7.0 KiB
C
234 lines
7.0 KiB
C
/* Native-dependent code for FreeBSD/amd64.
|
||
|
||
Copyright (C) 2003, 2004, 2007, 2008 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 <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "regcache.h"
|
||
#include "target.h"
|
||
|
||
#include "gdb_assert.h"
|
||
#include <signal.h>
|
||
#include <stddef.h>
|
||
#include <sys/types.h>
|
||
#include <sys/ptrace.h>
|
||
#include <sys/sysctl.h>
|
||
#include <machine/reg.h>
|
||
|
||
#include "fbsd-nat.h"
|
||
#include "amd64-tdep.h"
|
||
#include "amd64-nat.h"
|
||
|
||
|
||
/* Offset in `struct reg' where MEMBER is stored. */
|
||
#define REG_OFFSET(member) offsetof (struct reg, member)
|
||
|
||
/* At amd64fbsd64_r_reg_offset[REGNUM] you'll find the offset in
|
||
`struct reg' location where the GDB register REGNUM is stored.
|
||
Unsupported registers are marked with `-1'. */
|
||
static int amd64fbsd64_r_reg_offset[] =
|
||
{
|
||
REG_OFFSET (r_rax),
|
||
REG_OFFSET (r_rbx),
|
||
REG_OFFSET (r_rcx),
|
||
REG_OFFSET (r_rdx),
|
||
REG_OFFSET (r_rsi),
|
||
REG_OFFSET (r_rdi),
|
||
REG_OFFSET (r_rbp),
|
||
REG_OFFSET (r_rsp),
|
||
REG_OFFSET (r_r8),
|
||
REG_OFFSET (r_r9),
|
||
REG_OFFSET (r_r10),
|
||
REG_OFFSET (r_r11),
|
||
REG_OFFSET (r_r12),
|
||
REG_OFFSET (r_r13),
|
||
REG_OFFSET (r_r14),
|
||
REG_OFFSET (r_r15),
|
||
REG_OFFSET (r_rip),
|
||
REG_OFFSET (r_rflags),
|
||
REG_OFFSET (r_cs),
|
||
REG_OFFSET (r_ss),
|
||
-1,
|
||
-1,
|
||
-1,
|
||
-1
|
||
};
|
||
|
||
|
||
/* Mapping between the general-purpose registers in FreeBSD/amd64
|
||
`struct reg' format and GDB's register cache layout for
|
||
FreeBSD/i386.
|
||
|
||
Note that most FreeBSD/amd64 registers are 64-bit, while the
|
||
FreeBSD/i386 registers are all 32-bit, but since we're
|
||
little-endian we get away with that. */
|
||
|
||
/* From <machine/reg.h>. */
|
||
static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =
|
||
{
|
||
14 * 8, 13 * 8, /* %eax, %ecx */
|
||
12 * 8, 11 * 8, /* %edx, %ebx */
|
||
20 * 8, 10 * 8, /* %esp, %ebp */
|
||
9 * 8, 8 * 8, /* %esi, %edi */
|
||
17 * 8, 19 * 8, /* %eip, %eflags */
|
||
18 * 8, 21 * 8, /* %cs, %ss */
|
||
-1, -1, -1, -1 /* %ds, %es, %fs, %gs */
|
||
};
|
||
|
||
|
||
/* Support for debugging kernel virtual memory images. */
|
||
|
||
#include <sys/types.h>
|
||
#include <machine/pcb.h>
|
||
|
||
#include "bsd-kvm.h"
|
||
|
||
static int
|
||
amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
|
||
{
|
||
/* The following is true for FreeBSD 5.2:
|
||
|
||
The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
|
||
%ds, %es, %fs and %gs. This accounts for all callee-saved
|
||
registers specified by the psABI and then some. Here %esp
|
||
contains the stack pointer at the point just after the call to
|
||
cpu_switch(). From this information we reconstruct the register
|
||
state as it would like when we just returned from cpu_switch(). */
|
||
|
||
/* The stack pointer shouldn't be zero. */
|
||
if (pcb->pcb_rsp == 0)
|
||
return 0;
|
||
|
||
pcb->pcb_rsp += 8;
|
||
regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip);
|
||
regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx);
|
||
regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
|
||
regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
|
||
regcache_raw_supply (regcache, 12, &pcb->pcb_r12);
|
||
regcache_raw_supply (regcache, 13, &pcb->pcb_r13);
|
||
regcache_raw_supply (regcache, 14, &pcb->pcb_r14);
|
||
regcache_raw_supply (regcache, 15, &pcb->pcb_r15);
|
||
regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);
|
||
regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);
|
||
regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);
|
||
regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);
|
||
|
||
return 1;
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_amd64fbsd_nat (void);
|
||
|
||
void
|
||
_initialize_amd64fbsd_nat (void)
|
||
{
|
||
struct target_ops *t;
|
||
int offset;
|
||
|
||
amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
|
||
amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;
|
||
|
||
/* Add some extra features to the common *BSD/i386 target. */
|
||
t = amd64bsd_target ();
|
||
t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
|
||
t->to_find_memory_regions = fbsd_find_memory_regions;
|
||
t->to_make_corefile_notes = fbsd_make_corefile_notes;
|
||
add_target (t);
|
||
|
||
/* Support debugging kernel virtual memory images. */
|
||
bsd_kvm_add_target (amd64fbsd_supply_pcb);
|
||
|
||
/* To support the recognition of signal handlers, i386bsd-tdep.c
|
||
hardcodes some constants. Inclusion of this file means that we
|
||
are compiling a native debugger, which means that we can use the
|
||
system header files and sysctl(3) to get at the relevant
|
||
information. */
|
||
|
||
#define SC_REG_OFFSET amd64fbsd_sc_reg_offset
|
||
|
||
/* We only check the program counter, stack pointer and frame
|
||
pointer since these members of `struct sigcontext' are essential
|
||
for providing backtraces. */
|
||
|
||
#define SC_RIP_OFFSET SC_REG_OFFSET[AMD64_RIP_REGNUM]
|
||
#define SC_RSP_OFFSET SC_REG_OFFSET[AMD64_RSP_REGNUM]
|
||
#define SC_RBP_OFFSET SC_REG_OFFSET[AMD64_RBP_REGNUM]
|
||
|
||
/* Override the default value for the offset of the program counter
|
||
in the sigcontext structure. */
|
||
offset = offsetof (struct sigcontext, sc_rip);
|
||
|
||
if (SC_RIP_OFFSET != offset)
|
||
{
|
||
warning (_("\
|
||
offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>."),
|
||
offset, SC_RIP_OFFSET);
|
||
}
|
||
|
||
SC_RIP_OFFSET = offset;
|
||
|
||
/* Likewise for the stack pointer. */
|
||
offset = offsetof (struct sigcontext, sc_rsp);
|
||
|
||
if (SC_RSP_OFFSET != offset)
|
||
{
|
||
warning (_("\
|
||
offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>."),
|
||
offset, SC_RSP_OFFSET);
|
||
}
|
||
|
||
SC_RSP_OFFSET = offset;
|
||
|
||
/* And the frame pointer. */
|
||
offset = offsetof (struct sigcontext, sc_rbp);
|
||
|
||
if (SC_RBP_OFFSET != offset)
|
||
{
|
||
warning (_("\
|
||
offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>."),
|
||
offset, SC_RBP_OFFSET);
|
||
}
|
||
|
||
SC_RBP_OFFSET = offset;
|
||
|
||
/* FreeBSD provides a kern.ps_strings sysctl that we can use to
|
||
locate the sigtramp. That way we can still recognize a sigtramp
|
||
if its location is changed in a new kernel. Of course this is
|
||
still based on the assumption that the sigtramp is placed
|
||
directly under the location where the program arguments and
|
||
environment can be found. */
|
||
{
|
||
int mib[2];
|
||
long ps_strings;
|
||
size_t len;
|
||
|
||
mib[0] = CTL_KERN;
|
||
mib[1] = KERN_PS_STRINGS;
|
||
len = sizeof (ps_strings);
|
||
if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
|
||
{
|
||
amd64fbsd_sigtramp_start_addr = ps_strings - 32;
|
||
amd64fbsd_sigtramp_end_addr = ps_strings;
|
||
}
|
||
}
|
||
}
|