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e2879ccb MK |
1 | /* Target-dependent code for OpenBSD/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 "frame.h" | |
24 | #include "gdbcore.h" | |
25 | #include "osabi.h" | |
30b344b1 | 26 | #include "regset.h" |
e2879ccb MK |
27 | #include "target.h" |
28 | ||
29 | #include "gdb_assert.h" | |
30 | #include "gdb_string.h" | |
31 | ||
32 | #include "x86-64-tdep.h" | |
30b344b1 MK |
33 | #include "i387-tdep.h" |
34 | ||
35 | /* Support for core dumps. */ | |
36 | ||
37 | static void | |
38 | amd64obsd_supply_regset (const struct regset *regset, | |
39 | struct regcache *regcache, int regnum, | |
40 | const void *regs, size_t len) | |
41 | { | |
42 | const struct gdbarch_tdep *tdep = regset->descr; | |
43 | ||
44 | gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE); | |
45 | ||
46 | i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset); | |
47 | x86_64_supply_fxsave (regcache, regnum, (char *)regs + tdep->sizeof_gregset); | |
48 | } | |
49 | ||
50 | static const struct regset * | |
51 | amd64obsd_regset_from_core_section (struct gdbarch *gdbarch, | |
52 | const char *sect_name, size_t sect_size) | |
53 | { | |
54 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
55 | ||
56 | /* OpenBSD core dumps don't use seperate register sets for the | |
57 | general-purpose and floating-point registers. */ | |
58 | ||
59 | if (strcmp (sect_name, ".reg") == 0 | |
60 | && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE) | |
61 | { | |
62 | if (tdep->gregset == NULL) | |
63 | { | |
64 | tdep->gregset = XMALLOC (struct regset); | |
65 | tdep->gregset->descr = tdep; | |
66 | tdep->gregset->supply_regset = amd64obsd_supply_regset; | |
67 | } | |
68 | return tdep->gregset; | |
69 | } | |
70 | ||
71 | return NULL; | |
72 | } | |
73 | \f | |
e2879ccb MK |
74 | |
75 | /* Support for signal handlers. */ | |
76 | ||
77 | static const int amd64obsd_page_size = 4096; | |
78 | ||
79 | static int | |
80 | amd64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name) | |
81 | { | |
82 | CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1)); | |
83 | const char sigreturn[] = | |
84 | { | |
85 | 0x48, 0xc7, 0xc0, | |
86 | 0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */ | |
87 | 0x0f, 0x05 /* syscall */ | |
88 | }; | |
89 | char *buf; | |
90 | ||
91 | if (name) | |
92 | return 0; | |
93 | ||
94 | /* If we can't read the instructions at START_PC, return zero. */ | |
95 | buf = alloca (sizeof sigreturn); | |
96 | if (target_read_memory (start_pc + 0x7, buf, sizeof sigreturn)) | |
97 | return 0; | |
98 | ||
99 | /* Check for sigreturn(2). */ | |
100 | if (memcmp (buf, sigreturn, sizeof sigreturn)) | |
101 | return 0; | |
102 | ||
103 | return 1; | |
104 | } | |
105 | ||
106 | /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp | |
107 | routine, return the address of the associated sigcontext structure. */ | |
108 | ||
109 | static CORE_ADDR | |
110 | amd64obsd_sigcontext_addr (struct frame_info *next_frame) | |
111 | { | |
112 | /* The %rsp register points at `struct sigcontext' upon entry of a | |
113 | signal trampoline. */ | |
114 | return frame_unwind_register_unsigned (next_frame, X86_64_RSP_REGNUM); | |
115 | } | |
116 | \f | |
117 | /* OpenBSD 3.5 or later. */ | |
118 | ||
119 | /* Mapping between the general-purpose registers in `struct reg' | |
120 | format and GDB's register cache layout. */ | |
121 | ||
30b344b1 | 122 | /* From <machine/reg.h>. */ |
e2879ccb MK |
123 | int amd64obsd_r_reg_offset[] = |
124 | { | |
125 | 14 * 8, /* %rax */ | |
126 | 13 * 8, /* %rbx */ | |
127 | 3 * 8, /* %rcx */ | |
128 | 2 * 8, /* %rdx */ | |
129 | 1 * 8, /* %rsi */ | |
130 | 0 * 8, /* %rdi */ | |
131 | 12 * 8, /* %rbp */ | |
132 | 15 * 8, /* %rsp */ | |
133 | 4 * 8, /* %r8 .. */ | |
134 | 5 * 8, | |
135 | 6 * 8, | |
136 | 7 * 8, | |
137 | 8 * 8, | |
138 | 9 * 8, | |
139 | 10 * 8, | |
140 | 11 * 8, /* ... %r15 */ | |
141 | 16 * 8, /* %rip */ | |
142 | 17 * 8, /* %eflags */ | |
143 | 18 * 8, /* %cs */ | |
144 | 19 * 8, /* %ss */ | |
145 | 20 * 8, /* %ds */ | |
146 | 21 * 8, /* %es */ | |
147 | 22 * 8, /* %fs */ | |
148 | 23 * 8 /* %gs */ | |
149 | }; | |
150 | ||
30b344b1 | 151 | /* From <machine/signal.h>. */ |
e2879ccb MK |
152 | static int amd64obsd_sc_reg_offset[] = |
153 | { | |
154 | 14 * 8, /* %rax */ | |
155 | 13 * 8, /* %rbx */ | |
156 | 3 * 8, /* %rcx */ | |
157 | 2 * 8, /* %rdx */ | |
158 | 1 * 8, /* %rsi */ | |
159 | 0 * 8, /* %rdi */ | |
160 | 12 * 8, /* %rbp */ | |
161 | 24 * 8, /* %rsp */ | |
162 | 4 * 8, /* %r8 ... */ | |
163 | 5 * 8, | |
164 | 6 * 8, | |
165 | 7 * 8, | |
166 | 8 * 8, | |
167 | 9 * 8, | |
168 | 10 * 8, | |
169 | 11 * 8, /* ... %r15 */ | |
170 | 21 * 8, /* %rip */ | |
171 | 23 * 8, /* %eflags */ | |
172 | 22 * 8, /* %cs */ | |
173 | 25 * 8, /* %ss */ | |
174 | 18 * 8, /* %ds */ | |
175 | 17 * 8, /* %es */ | |
176 | 16 * 8, /* %fs */ | |
177 | 15 * 8 /* %gs */ | |
178 | }; | |
179 | ||
180 | static void | |
181 | amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
182 | { | |
183 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
184 | ||
e2879ccb MK |
185 | x86_64_init_abi (info, gdbarch); |
186 | ||
30b344b1 MK |
187 | /* Initialize general-purpose register set details. */ |
188 | tdep->gregset_reg_offset = amd64obsd_r_reg_offset; | |
189 | tdep->gregset_num_regs = ARRAY_SIZE (amd64obsd_r_reg_offset); | |
190 | tdep->sizeof_gregset = 24 * 8; | |
191 | ||
192 | set_gdbarch_regset_from_core_section (gdbarch, | |
193 | amd64obsd_regset_from_core_section); | |
194 | ||
e2879ccb MK |
195 | tdep->jb_pc_offset = 7 * 8; |
196 | ||
197 | set_gdbarch_pc_in_sigtramp (gdbarch, amd64obsd_pc_in_sigtramp); | |
198 | tdep->sigcontext_addr = amd64obsd_sigcontext_addr; | |
199 | tdep->sc_reg_offset = amd64obsd_sc_reg_offset; | |
200 | tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset); | |
201 | } | |
202 | \f | |
203 | ||
204 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
205 | void _initialize_amd64obsd_tdep (void); | |
206 | ||
207 | void | |
30b344b1 | 208 | _initialize_amd64obsd_tdep (void) |
e2879ccb MK |
209 | { |
210 | /* The OpenBSD/amd64 native dependent code makes this assumption. */ | |
211 | gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == X86_64_NUM_GREGS); | |
212 | ||
213 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, | |
214 | GDB_OSABI_OPENBSD_ELF, amd64obsd_init_abi); | |
30b344b1 MK |
215 | |
216 | /* OpenBSD uses traditional (a.out) NetBSD-style core dumps. */ | |
217 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, | |
218 | GDB_OSABI_NETBSD_AOUT, amd64obsd_init_abi); | |
e2879ccb | 219 | } |