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[gdb.git] / gdb / amd64fbsd-tdep.c
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1 /* Target-dependent code for FreeBSD/amd64.
3 Copyright (C) 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "defs.h"
21 #include "arch-utils.h"
22 #include "frame.h"
23 #include "gdbcore.h"
24 #include "regcache.h"
25 #include "osabi.h"
27 #include "gdb_assert.h"
28 #include "gdb_string.h"
30 #include "amd64-tdep.h"
31 #include "bsd-uthread.h"
32 #include "solib-svr4.h"
34 /* Support for signal handlers. */
36 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
37 routine, return the address of the associated sigcontext structure. */
39 static CORE_ADDR
40 amd64fbsd_sigcontext_addr (struct frame_info *next_frame)
42 CORE_ADDR sp;
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;
51 /* FreeBSD 5.1-RELEASE or later. */
53 /* Mapping between the general-purpose registers in `struct reg'
54 format and GDB's register cache layout.
56 Note that some registers are 32-bit, but since we're little-endian
57 we get away with that. */
59 /* From <machine/reg.h>. */
60 static int amd64fbsd_r_reg_offset[] =
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 */
88 /* Location of the signal trampoline. */
89 CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0ULL;
90 CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0ULL;
92 /* From <machine/signal.h>. */
93 int amd64fbsd_sc_reg_offset[] =
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 */
121 /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
122 static int amd64fbsd_jmp_buf_reg_offset[] =
124 -1, /* %rax */
125 1 * 8, /* %rbx */
126 -1, /* %rcx */
127 -1, /* %rdx */
128 -1, /* %rsi */
129 -1, /* %rdi */
130 3 * 8, /* %rbp */
131 2 * 8, /* %rsp */
132 -1, /* %r8 ... */
135 -1, /* ... %r11 */
136 4 * 8, /* %r12 ... */
137 5 * 8,
138 6 * 8,
139 7 * 8, /* ... %r15 */
140 0 * 8 /* %rip */
143 static void
144 amd64fbsd_supply_uthread (struct regcache *regcache,
145 int regnum, CORE_ADDR addr)
147 gdb_byte buf[8];
148 int i;
150 gdb_assert (regnum >= -1);
152 for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
154 if (amd64fbsd_jmp_buf_reg_offset[i] != -1
155 && (regnum == -1 || regnum == i))
157 read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
158 regcache_raw_supply (regcache, i, buf);
163 static void
164 amd64fbsd_collect_uthread (const struct regcache *regcache,
165 int regnum, CORE_ADDR addr)
167 gdb_byte buf[8];
168 int i;
170 gdb_assert (regnum >= -1);
172 for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
174 if (amd64fbsd_jmp_buf_reg_offset[i] != -1
175 && (regnum == -1 || regnum == i))
177 regcache_raw_collect (regcache, i, buf);
178 write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
183 void
184 amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
186 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
188 /* Obviously FreeBSD is BSD-based. */
189 i386bsd_init_abi (info, gdbarch);
191 tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
192 tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
193 tdep->sizeof_gregset = 22 * 8;
195 amd64_init_abi (info, gdbarch);
197 tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
198 tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
199 tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
200 tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
201 tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
203 /* FreeBSD provides a user-level threads implementation. */
204 bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread);
205 bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread);
207 /* FreeBSD uses SVR4-style shared libraries. */
208 set_solib_svr4_fetch_link_map_offsets
209 (gdbarch, svr4_lp64_fetch_link_map_offsets);
213 /* Provide a prototype to silence -Wmissing-prototypes. */
214 void _initialize_amd64fbsd_tdep (void);
216 void
217 _initialize_amd64fbsd_tdep (void)
219 gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
220 GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);