1/* Target-dependent code for FreeBSD/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 "regcache.h"
27#include "osabi.h"
28
29#include "gdb_string.h"
30
31#include "amd64-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
40amd64fbsd_sigcontext_addr (struct frame_info *next_frame)
41{
42  CORE_ADDR sp;
43
44  /* The `struct sigcontext' (which really is an `ucontext_t' on
45     FreeBSD/amd64) lives at a fixed offset in the signal frame.  See
46     <machine/sigframe.h>.  */
47  sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
48  return sp + 16;
49}
50
51/* FreeBSD 5.1-RELEASE or later.  */
52
53/* Mapping between the general-purpose registers in `struct reg'
54   format and GDB's register cache layout.
55
56   Note that some registers are 32-bit, but since we're little-endian
57   we get away with that.  */
58
59/* From <machine/reg.h>.  */
60static int amd64fbsd_r_reg_offset[] =
61{
62  14 * 8,			/* %rax */
63  11 * 8,			/* %rbx */
64  13 * 8,			/* %rcx */
65  12 * 8,			/* %rdx */
66  9 * 8,			/* %rsi */
67  8 * 8,			/* %rdi */
68  10 * 8,			/* %rbp */
69  20 * 8,			/* %rsp */
70  7 * 8,			/* %r8 ... */
71  6 * 8,
72  5 * 8,
73  4 * 8,
74  3 * 8,
75  2 * 8,
76  1 * 8,
77  0 * 8,			/* ... %r15 */
78  17 * 8,			/* %rip */
79  19 * 8,			/* %eflags */
80  18 * 8,			/* %cs */
81  21 * 8,			/* %ss */
82  -1,				/* %ds */
83  -1,				/* %es */
84  -1,				/* %fs */
85  -1				/* %gs */
86};
87
88/* Location of the signal trampoline.  */
89CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0;
90CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0;
91
92/* From <machine/signal.h>.  */
93int amd64fbsd_sc_reg_offset[] =
94{
95  24 + 6 * 8,			/* %rax */
96  24 + 7 * 8,			/* %rbx */
97  24 + 3 * 8,			/* %rcx */
98  24 + 2 * 8,			/* %rdx */
99  24 + 1 * 8,			/* %rsi */
100  24 + 0 * 8,			/* %rdi */
101  24 + 8 * 8,			/* %rbp */
102  24 + 22 * 8,			/* %rsp */
103  24 + 4 * 8,			/* %r8 ... */
104  24 + 5 * 8,
105  24 + 9 * 8,
106  24 + 10 * 8,
107  24 + 11 * 8,
108  24 + 12 * 8,
109  24 + 13 * 8,
110  24 + 14 * 8,			/* ... %r15 */
111  24 + 19 * 8,			/* %rip */
112  24 + 21 * 8,			/* %eflags */
113  24 + 20 * 8,			/* %cs */
114  24 + 23 * 8,			/* %ss */
115  -1,				/* %ds */
116  -1,				/* %es */
117  -1,				/* %fs */
118  -1				/* %gs */
119};
120
121void
122amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
123{
124  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
125
126  /* Obviously FreeBSD is BSD-based.  */
127  i386bsd_init_abi (info, gdbarch);
128
129  tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
130  tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
131  tdep->sizeof_gregset = 22 * 8;
132
133  amd64_init_abi (info, gdbarch);
134
135  tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
136  tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
137  tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
138  tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
139  tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
140
141  /* FreeBSD uses SVR4-style shared libraries.  */
142  set_solib_svr4_fetch_link_map_offsets
143    (gdbarch, svr4_lp64_fetch_link_map_offsets);
144}
145
146
147/* Provide a prototype to silence -Wmissing-prototypes.  */
148void _initialize_amd64fbsd_tdep (void);
149
150void
151_initialize_amd64fbsd_tdep (void)
152{
153  gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
154			  GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);
155}
156