1/* Target-dependent code for NetBSD/amd64.
2
3   Copyright 2003, 2004 Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include "defs.h"
23#include "arch-utils.h"
24#include "frame.h"
25#include "gdbcore.h"
26#include "osabi.h"
27
28#include "gdb_assert.h"
29
30#include "amd64-tdep.h"
31#include "nbsd-tdep.h"
32#include "solib-svr4.h"
33
34/* Support for signal handlers.  */
35
36/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
37   routine, return the address of the associated sigcontext structure.  */
38
39static CORE_ADDR
40amd64nbsd_sigcontext_addr (struct frame_info *next_frame)
41{
42  CORE_ADDR sp;
43
44  /* The stack pointer points at `struct sigcontext' upon entry of a
45     signal trampoline.  */
46  sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
47  return sp;
48}
49
50/* NetBSD 2.0 or later.  */
51
52/* Mapping between the general-purpose registers in `struct reg'
53   format and GDB's register cache layout.  */
54
55/* From <machine/reg.h>.  */
56int amd64nbsd_r_reg_offset[] =
57{
58  14 * 8,			/* %rax */
59  13 * 8,			/* %rbx */
60  3 * 8,			/* %rcx */
61  2 * 8,			/* %rdx */
62  1 * 8,			/* %rsi */
63  0 * 8,			/* %rdi */
64  12 * 8,			/* %rbp */
65  24 * 8,			/* %rsp */
66  4 * 8,			/* %r8 .. */
67  5 * 8,
68  6 * 8,
69  7 * 8,
70  8 * 8,
71  9 * 8,
72  10 * 8,
73  11 * 8,			/* ... %r15 */
74  21 * 8,			/* %rip */
75  23 * 8,			/* %eflags */
76  22 * 8,			/* %cs */
77  25 * 8,			/* %ss */
78  18 * 8,			/* %ds */
79  17 * 8,			/* %es */
80  16 * 8,			/* %fs */
81  15 * 8			/* %gs */
82};
83
84static void
85amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
86{
87  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
88  int *sc_reg_offset;
89  int i;
90
91  /* Initialize general-purpose register set details first.  */
92  tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
93  tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
94  tdep->sizeof_gregset = 26 * 8;
95
96  amd64_init_abi (info, gdbarch);
97
98  tdep->jb_pc_offset = 7 * 8;
99
100  /* NetBSD has its own convention for signal trampolines.  */
101  set_gdbarch_pc_in_sigtramp (gdbarch, nbsd_pc_in_sigtramp);
102  tdep->sigcontext_addr = amd64nbsd_sigcontext_addr;
103
104  /* Initialize the array with register offsets in `struct
105     sigcontext'.  This `struct sigcontext' has an sc_mcontext member
106     at offset 32, and in <machine/reg.h> we have an explicit comment
107     saying that `struct reg' is the same as mcontext.__gregs.  */
108  tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
109  tdep->sc_reg_offset = XCALLOC (tdep->sc_num_regs, int);
110  for (i = 0; i < tdep->sc_num_regs; i++)
111    {
112      if (amd64nbsd_r_reg_offset[i] < 0)
113	tdep->sc_reg_offset[i] = -1;
114      else
115	tdep->sc_reg_offset[i] = 32 + amd64nbsd_r_reg_offset[i];
116    }
117
118  /* NetBSD uses SVR4-style shared libraries.  */
119  set_solib_svr4_fetch_link_map_offsets
120    (gdbarch, svr4_lp64_fetch_link_map_offsets);
121}
122
123
124/* Provide a prototype to silence -Wmissing-prototypes.  */
125void _initialize_amd64nbsd_tdep (void);
126
127void
128_initialize_amd64nbsd_ndep (void)
129{
130  /* The NetBSD/amd64 native dependent code makes this assumption.  */
131  gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
132
133  gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
134			  GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
135}
136