250 lines
6.8 KiB
C
250 lines
6.8 KiB
C
/* Target-dependent code for FreeBSD/amd64.
|
||
|
||
Copyright (C) 2003-2018 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 "arch-utils.h"
|
||
#include "frame.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "osabi.h"
|
||
#include "regset.h"
|
||
#include "i386-fbsd-tdep.h"
|
||
#include "x86-xstate.h"
|
||
|
||
#include "amd64-tdep.h"
|
||
#include "fbsd-tdep.h"
|
||
#include "solib-svr4.h"
|
||
|
||
/* Support for signal handlers. */
|
||
|
||
/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
|
||
routine. */
|
||
|
||
static const gdb_byte amd64fbsd_sigtramp_code[] =
|
||
{
|
||
0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */
|
||
0x6a, 0x00, /* pushq $0 */
|
||
0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00,
|
||
/* movq $SYS_sigreturn,%rax */
|
||
0x0f, 0x05 /* syscall */
|
||
};
|
||
|
||
static int
|
||
amd64fbsd_sigtramp_p (struct frame_info *this_frame)
|
||
{
|
||
CORE_ADDR pc = get_frame_pc (this_frame);
|
||
gdb_byte buf[sizeof amd64fbsd_sigtramp_code];
|
||
|
||
if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf))
|
||
return 0;
|
||
if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code)
|
||
!= 0)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
|
||
address of the associated sigcontext structure. */
|
||
|
||
static CORE_ADDR
|
||
amd64fbsd_sigcontext_addr (struct frame_info *this_frame)
|
||
{
|
||
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
CORE_ADDR sp;
|
||
gdb_byte buf[8];
|
||
|
||
/* The `struct sigcontext' (which really is an `ucontext_t' on
|
||
FreeBSD/amd64) lives at a fixed offset in the signal frame. See
|
||
<machine/sigframe.h>. */
|
||
get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
|
||
sp = extract_unsigned_integer (buf, 8, byte_order);
|
||
return sp + 16;
|
||
}
|
||
|
||
/* FreeBSD 5.1-RELEASE or later. */
|
||
|
||
/* Mapping between the general-purpose registers in `struct reg'
|
||
format and GDB's register cache layout.
|
||
|
||
Note that some registers are 32-bit, but since we're little-endian
|
||
we get away with that. */
|
||
|
||
/* From <machine/reg.h>. */
|
||
static int amd64fbsd_r_reg_offset[] =
|
||
{
|
||
14 * 8, /* %rax */
|
||
11 * 8, /* %rbx */
|
||
13 * 8, /* %rcx */
|
||
12 * 8, /* %rdx */
|
||
9 * 8, /* %rsi */
|
||
8 * 8, /* %rdi */
|
||
10 * 8, /* %rbp */
|
||
20 * 8, /* %rsp */
|
||
7 * 8, /* %r8 ... */
|
||
6 * 8,
|
||
5 * 8,
|
||
4 * 8,
|
||
3 * 8,
|
||
2 * 8,
|
||
1 * 8,
|
||
0 * 8, /* ... %r15 */
|
||
17 * 8, /* %rip */
|
||
19 * 8, /* %eflags */
|
||
18 * 8, /* %cs */
|
||
21 * 8, /* %ss */
|
||
-1, /* %ds */
|
||
-1, /* %es */
|
||
-1, /* %fs */
|
||
-1 /* %gs */
|
||
};
|
||
|
||
/* Location of the signal trampoline. */
|
||
CORE_ADDR amd64fbsd_sigtramp_start_addr;
|
||
CORE_ADDR amd64fbsd_sigtramp_end_addr;
|
||
|
||
/* From <machine/signal.h>. */
|
||
int amd64fbsd_sc_reg_offset[] =
|
||
{
|
||
24 + 6 * 8, /* %rax */
|
||
24 + 7 * 8, /* %rbx */
|
||
24 + 3 * 8, /* %rcx */
|
||
24 + 2 * 8, /* %rdx */
|
||
24 + 1 * 8, /* %rsi */
|
||
24 + 0 * 8, /* %rdi */
|
||
24 + 8 * 8, /* %rbp */
|
||
24 + 22 * 8, /* %rsp */
|
||
24 + 4 * 8, /* %r8 ... */
|
||
24 + 5 * 8,
|
||
24 + 9 * 8,
|
||
24 + 10 * 8,
|
||
24 + 11 * 8,
|
||
24 + 12 * 8,
|
||
24 + 13 * 8,
|
||
24 + 14 * 8, /* ... %r15 */
|
||
24 + 19 * 8, /* %rip */
|
||
24 + 21 * 8, /* %eflags */
|
||
24 + 20 * 8, /* %cs */
|
||
24 + 23 * 8, /* %ss */
|
||
-1, /* %ds */
|
||
-1, /* %es */
|
||
-1, /* %fs */
|
||
-1 /* %gs */
|
||
};
|
||
|
||
/* Implement the core_read_description gdbarch method. */
|
||
|
||
static const struct target_desc *
|
||
amd64fbsd_core_read_description (struct gdbarch *gdbarch,
|
||
struct target_ops *target,
|
||
bfd *abfd)
|
||
{
|
||
return amd64_target_description (i386fbsd_core_read_xcr0 (abfd));
|
||
}
|
||
|
||
/* Similar to amd64_supply_fpregset, but use XSAVE extended state. */
|
||
|
||
static void
|
||
amd64fbsd_supply_xstateregset (const struct regset *regset,
|
||
struct regcache *regcache, int regnum,
|
||
const void *xstateregs, size_t len)
|
||
{
|
||
amd64_supply_xsave (regcache, regnum, xstateregs);
|
||
}
|
||
|
||
/* Similar to amd64_collect_fpregset, but use XSAVE extended state. */
|
||
|
||
static void
|
||
amd64fbsd_collect_xstateregset (const struct regset *regset,
|
||
const struct regcache *regcache,
|
||
int regnum, void *xstateregs, size_t len)
|
||
{
|
||
amd64_collect_xsave (regcache, regnum, xstateregs, 1);
|
||
}
|
||
|
||
static const struct regset amd64fbsd_xstateregset =
|
||
{
|
||
NULL,
|
||
amd64fbsd_supply_xstateregset,
|
||
amd64fbsd_collect_xstateregset
|
||
};
|
||
|
||
/* Iterate over core file register note sections. */
|
||
|
||
static void
|
||
amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
||
iterate_over_regset_sections_cb *cb,
|
||
void *cb_data,
|
||
const struct regcache *regcache)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
cb (".reg", tdep->sizeof_gregset, &i386_gregset, NULL, cb_data);
|
||
cb (".reg2", tdep->sizeof_fpregset, &amd64_fpregset, NULL, cb_data);
|
||
cb (".reg-xstate", X86_XSTATE_SIZE(tdep->xcr0),
|
||
&amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
|
||
}
|
||
|
||
static void
|
||
amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Generic FreeBSD support. */
|
||
fbsd_init_abi (info, gdbarch);
|
||
|
||
/* Obviously FreeBSD is BSD-based. */
|
||
i386bsd_init_abi (info, gdbarch);
|
||
|
||
tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
|
||
tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
|
||
tdep->sizeof_gregset = 22 * 8;
|
||
|
||
amd64_init_abi (info, gdbarch,
|
||
amd64_target_description (X86_XSTATE_SSE_MASK));
|
||
|
||
tdep->sigtramp_p = amd64fbsd_sigtramp_p;
|
||
tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
|
||
tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
|
||
tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
|
||
tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
|
||
tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
|
||
|
||
tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET;
|
||
|
||
/* Iterate over core file register note sections. */
|
||
set_gdbarch_iterate_over_regset_sections
|
||
(gdbarch, amd64fbsd_iterate_over_regset_sections);
|
||
|
||
set_gdbarch_core_read_description (gdbarch,
|
||
amd64fbsd_core_read_description);
|
||
|
||
/* FreeBSD uses SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, svr4_lp64_fetch_link_map_offsets);
|
||
}
|
||
|
||
void
|
||
_initialize_amd64fbsd_tdep (void)
|
||
{
|
||
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
|
||
GDB_OSABI_FREEBSD, amd64fbsd_init_abi);
|
||
}
|