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/* Target-dependent code for NetBSD/amd64.
Copyright (C) 2003-2020 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 "osabi.h"
#include "symtab.h"
#include "amd64-tdep.h"
#include "gdbsupport/x86-xstate.h"
#include "nbsd-tdep.h"
#include "solib-svr4.h"
/* Support for signal handlers. */
/* Return whether THIS_FRAME corresponds to a NetBSD sigtramp
routine. */
static int
amd64nbsd_sigtramp_p (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
const char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
return nbsd_pc_in_sigtramp (pc, name);
}
/* Assuming THIS_FRAME corresponds to a NetBSD sigtramp routine,
return the address of the associated mcontext structure. */
static CORE_ADDR
amd64nbsd_mcontext_addr (struct frame_info *this_frame)
{
CORE_ADDR addr;
/* The register %r15 points at `struct ucontext' upon entry of a
signal trampoline. */
addr = get_frame_register_unsigned (this_frame, AMD64_R15_REGNUM);
/* The mcontext structure lives as offset 56 in `struct ucontext'. */
return addr + 56;
}
/* NetBSD 2.0 or later. */
/* Mapping between the general-purpose registers in `struct reg'
format and GDB's register cache layout. */
/* From <machine/reg.h>. */
int amd64nbsd_r_reg_offset[] =
{
14 * 8, /* %rax */
13 * 8, /* %rbx */
3 * 8, /* %rcx */
2 * 8, /* %rdx */
1 * 8, /* %rsi */
0 * 8, /* %rdi */
12 * 8, /* %rbp */
24 * 8, /* %rsp */
4 * 8, /* %r8 .. */
5 * 8,
6 * 8,
7 * 8,
8 * 8,
9 * 8,
10 * 8,
11 * 8, /* ... %r15 */
21 * 8, /* %rip */
23 * 8, /* %eflags */
22 * 8, /* %cs */
25 * 8, /* %ss */
18 * 8, /* %ds */
17 * 8, /* %es */
16 * 8, /* %fs */
15 * 8 /* %gs */
};
static void
amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Initialize general-purpose register set details first. */
tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
tdep->sizeof_gregset = 26 * 8;
amd64_init_abi (info, gdbarch,
amd64_target_description (X86_XSTATE_SSE_MASK, true));
tdep->jb_pc_offset = 7 * 8;
/* NetBSD has its own convention for signal trampolines. */
tdep->sigtramp_p = amd64nbsd_sigtramp_p;
tdep->sigcontext_addr = amd64nbsd_mcontext_addr;
tdep->sc_reg_offset = amd64nbsd_r_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
/* NetBSD uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
}
void
_initialize_amd64nbsd_tdep (void)
{
/* The NetBSD/amd64 native dependent code makes this assumption. */
gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
GDB_OSABI_NETBSD, amd64nbsd_init_abi);
}
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