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68cc0bfb | 1 | /* Target-dependent code for FreeBSD/amd64. |
477f40d1 | 2 | |
618f726f | 3 | Copyright (C) 2003-2016 Free Software Foundation, Inc. |
68cc0bfb MK |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
68cc0bfb MK |
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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
68cc0bfb MK |
19 | |
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" | |
97de3545 JB |
26 | #include "regset.h" |
27 | #include "i386fbsd-tdep.h" | |
28 | #include "x86-xstate.h" | |
68cc0bfb | 29 | |
85be1ca6 | 30 | #include "amd64-tdep.h" |
1c02b2a5 | 31 | #include "bsd-uthread.h" |
490496c3 | 32 | #include "fbsd-tdep.h" |
7e654c37 | 33 | #include "solib-svr4.h" |
68cc0bfb MK |
34 | |
35 | /* Support for signal handlers. */ | |
36 | ||
cf424aef JB |
37 | /* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp |
38 | routine. */ | |
39 | ||
40 | static const gdb_byte amd64fbsd_sigtramp_code[] = | |
41 | { | |
42 | 0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */ | |
43 | 0x6a, 0x00, /* pushq $0 */ | |
44 | 0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00, | |
45 | /* movq $SYS_sigreturn,%rax */ | |
46 | 0x0f, 0x05 /* syscall */ | |
47 | }; | |
48 | ||
49 | static int | |
50 | amd64fbsd_sigtramp_p (struct frame_info *this_frame) | |
51 | { | |
52 | CORE_ADDR pc = get_frame_pc (this_frame); | |
53 | gdb_byte buf[sizeof amd64fbsd_sigtramp_code]; | |
54 | ||
55 | if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf)) | |
56 | return 0; | |
773eacf5 JB |
57 | if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code) |
58 | != 0) | |
cf424aef JB |
59 | return 0; |
60 | ||
61 | return 1; | |
62 | } | |
63 | ||
10458914 DJ |
64 | /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the |
65 | address of the associated sigcontext structure. */ | |
68cc0bfb MK |
66 | |
67 | static CORE_ADDR | |
10458914 | 68 | amd64fbsd_sigcontext_addr (struct frame_info *this_frame) |
68cc0bfb | 69 | { |
c5cb74ee JB |
70 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
71 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
68cc0bfb | 72 | CORE_ADDR sp; |
c5cb74ee | 73 | gdb_byte buf[8]; |
68cc0bfb | 74 | |
212c460c MK |
75 | /* The `struct sigcontext' (which really is an `ucontext_t' on |
76 | FreeBSD/amd64) lives at a fixed offset in the signal frame. See | |
77 | <machine/sigframe.h>. */ | |
c5cb74ee JB |
78 | get_frame_register (this_frame, AMD64_RSP_REGNUM, buf); |
79 | sp = extract_unsigned_integer (buf, 8, byte_order); | |
212c460c | 80 | return sp + 16; |
68cc0bfb MK |
81 | } |
82 | \f | |
83 | /* FreeBSD 5.1-RELEASE or later. */ | |
84 | ||
477f40d1 MK |
85 | /* Mapping between the general-purpose registers in `struct reg' |
86 | format and GDB's register cache layout. | |
87 | ||
88 | Note that some registers are 32-bit, but since we're little-endian | |
89 | we get away with that. */ | |
90 | ||
91 | /* From <machine/reg.h>. */ | |
92 | static int amd64fbsd_r_reg_offset[] = | |
93 | { | |
af233647 MK |
94 | 14 * 8, /* %rax */ |
95 | 11 * 8, /* %rbx */ | |
96 | 13 * 8, /* %rcx */ | |
97 | 12 * 8, /* %rdx */ | |
98 | 9 * 8, /* %rsi */ | |
99 | 8 * 8, /* %rdi */ | |
100 | 10 * 8, /* %rbp */ | |
101 | 20 * 8, /* %rsp */ | |
0963b4bd | 102 | 7 * 8, /* %r8 ... */ |
af233647 MK |
103 | 6 * 8, |
104 | 5 * 8, | |
105 | 4 * 8, | |
106 | 3 * 8, | |
107 | 2 * 8, | |
108 | 1 * 8, | |
109 | 0 * 8, /* ... %r15 */ | |
110 | 17 * 8, /* %rip */ | |
111 | 19 * 8, /* %eflags */ | |
112 | 18 * 8, /* %cs */ | |
113 | 21 * 8, /* %ss */ | |
114 | -1, /* %ds */ | |
115 | -1, /* %es */ | |
116 | -1, /* %fs */ | |
117 | -1 /* %gs */ | |
477f40d1 MK |
118 | }; |
119 | ||
68cc0bfb | 120 | /* Location of the signal trampoline. */ |
cf424aef JB |
121 | CORE_ADDR amd64fbsd_sigtramp_start_addr; |
122 | CORE_ADDR amd64fbsd_sigtramp_end_addr; | |
68cc0bfb MK |
123 | |
124 | /* From <machine/signal.h>. */ | |
af233647 | 125 | int amd64fbsd_sc_reg_offset[] = |
68cc0bfb | 126 | { |
212c460c MK |
127 | 24 + 6 * 8, /* %rax */ |
128 | 24 + 7 * 8, /* %rbx */ | |
129 | 24 + 3 * 8, /* %rcx */ | |
130 | 24 + 2 * 8, /* %rdx */ | |
131 | 24 + 1 * 8, /* %rsi */ | |
132 | 24 + 0 * 8, /* %rdi */ | |
133 | 24 + 8 * 8, /* %rbp */ | |
dac94105 | 134 | 24 + 22 * 8, /* %rsp */ |
0963b4bd | 135 | 24 + 4 * 8, /* %r8 ... */ |
af233647 MK |
136 | 24 + 5 * 8, |
137 | 24 + 9 * 8, | |
138 | 24 + 10 * 8, | |
139 | 24 + 11 * 8, | |
140 | 24 + 12 * 8, | |
141 | 24 + 13 * 8, | |
142 | 24 + 14 * 8, /* ... %r15 */ | |
dac94105 MK |
143 | 24 + 19 * 8, /* %rip */ |
144 | 24 + 21 * 8, /* %eflags */ | |
af233647 MK |
145 | 24 + 20 * 8, /* %cs */ |
146 | 24 + 23 * 8, /* %ss */ | |
68cc0bfb MK |
147 | -1, /* %ds */ |
148 | -1, /* %es */ | |
149 | -1, /* %fs */ | |
150 | -1 /* %gs */ | |
151 | }; | |
152 | ||
1c02b2a5 MK |
153 | /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */ |
154 | static int amd64fbsd_jmp_buf_reg_offset[] = | |
155 | { | |
156 | -1, /* %rax */ | |
157 | 1 * 8, /* %rbx */ | |
158 | -1, /* %rcx */ | |
159 | -1, /* %rdx */ | |
160 | -1, /* %rsi */ | |
161 | -1, /* %rdi */ | |
162 | 3 * 8, /* %rbp */ | |
163 | 2 * 8, /* %rsp */ | |
0963b4bd | 164 | -1, /* %r8 ... */ |
1c02b2a5 MK |
165 | -1, |
166 | -1, | |
167 | -1, /* ... %r11 */ | |
0963b4bd | 168 | 4 * 8, /* %r12 ... */ |
1c02b2a5 MK |
169 | 5 * 8, |
170 | 6 * 8, | |
171 | 7 * 8, /* ... %r15 */ | |
172 | 0 * 8 /* %rip */ | |
173 | }; | |
174 | ||
97de3545 JB |
175 | /* Implement the core_read_description gdbarch method. */ |
176 | ||
177 | static const struct target_desc * | |
178 | amd64fbsd_core_read_description (struct gdbarch *gdbarch, | |
179 | struct target_ops *target, | |
180 | bfd *abfd) | |
181 | { | |
182 | return amd64_target_description (i386fbsd_core_read_xcr0 (abfd)); | |
183 | } | |
184 | ||
185 | /* Similar to amd64_supply_fpregset, but use XSAVE extended state. */ | |
186 | ||
187 | static void | |
188 | amd64fbsd_supply_xstateregset (const struct regset *regset, | |
189 | struct regcache *regcache, int regnum, | |
190 | const void *xstateregs, size_t len) | |
191 | { | |
192 | amd64_supply_xsave (regcache, regnum, xstateregs); | |
193 | } | |
194 | ||
195 | /* Similar to amd64_collect_fpregset, but use XSAVE extended state. */ | |
196 | ||
197 | static void | |
198 | amd64fbsd_collect_xstateregset (const struct regset *regset, | |
199 | const struct regcache *regcache, | |
200 | int regnum, void *xstateregs, size_t len) | |
201 | { | |
202 | amd64_collect_xsave (regcache, regnum, xstateregs, 1); | |
203 | } | |
204 | ||
205 | static const struct regset amd64fbsd_xstateregset = | |
206 | { | |
207 | NULL, | |
208 | amd64fbsd_supply_xstateregset, | |
209 | amd64fbsd_collect_xstateregset | |
210 | }; | |
211 | ||
212 | /* Iterate over core file register note sections. */ | |
213 | ||
214 | static void | |
215 | amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
216 | iterate_over_regset_sections_cb *cb, | |
217 | void *cb_data, | |
218 | const struct regcache *regcache) | |
219 | { | |
220 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
221 | ||
222 | cb (".reg", tdep->sizeof_gregset, &i386_gregset, NULL, cb_data); | |
223 | cb (".reg2", tdep->sizeof_fpregset, &amd64_fpregset, NULL, cb_data); | |
224 | cb (".reg-xstate", X86_XSTATE_SIZE(tdep->xcr0), | |
225 | &amd64fbsd_xstateregset, "XSAVE extended state", cb_data); | |
226 | } | |
227 | ||
1c02b2a5 MK |
228 | static void |
229 | amd64fbsd_supply_uthread (struct regcache *regcache, | |
230 | int regnum, CORE_ADDR addr) | |
231 | { | |
4252dc94 | 232 | gdb_byte buf[8]; |
1c02b2a5 MK |
233 | int i; |
234 | ||
235 | gdb_assert (regnum >= -1); | |
236 | ||
237 | for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++) | |
238 | { | |
239 | if (amd64fbsd_jmp_buf_reg_offset[i] != -1 | |
240 | && (regnum == -1 || regnum == i)) | |
241 | { | |
242 | read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8); | |
243 | regcache_raw_supply (regcache, i, buf); | |
244 | } | |
245 | } | |
246 | } | |
247 | ||
248 | static void | |
249 | amd64fbsd_collect_uthread (const struct regcache *regcache, | |
250 | int regnum, CORE_ADDR addr) | |
251 | { | |
4252dc94 | 252 | gdb_byte buf[8]; |
1c02b2a5 MK |
253 | int i; |
254 | ||
255 | gdb_assert (regnum >= -1); | |
256 | ||
257 | for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++) | |
258 | { | |
259 | if (amd64fbsd_jmp_buf_reg_offset[i] != -1 | |
260 | && (regnum == -1 || regnum == i)) | |
261 | { | |
262 | regcache_raw_collect (regcache, i, buf); | |
263 | write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8); | |
264 | } | |
265 | } | |
266 | } | |
267 | ||
63807e1d | 268 | static void |
68cc0bfb MK |
269 | amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
270 | { | |
271 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
272 | ||
490496c3 AA |
273 | /* Generic FreeBSD support. */ |
274 | fbsd_init_abi (info, gdbarch); | |
275 | ||
68cc0bfb MK |
276 | /* Obviously FreeBSD is BSD-based. */ |
277 | i386bsd_init_abi (info, gdbarch); | |
278 | ||
477f40d1 MK |
279 | tdep->gregset_reg_offset = amd64fbsd_r_reg_offset; |
280 | tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset); | |
281 | tdep->sizeof_gregset = 22 * 8; | |
282 | ||
90f90721 | 283 | amd64_init_abi (info, gdbarch); |
68cc0bfb | 284 | |
cf424aef | 285 | tdep->sigtramp_p = amd64fbsd_sigtramp_p; |
10fc94a4 MK |
286 | tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr; |
287 | tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr; | |
68cc0bfb MK |
288 | tdep->sigcontext_addr = amd64fbsd_sigcontext_addr; |
289 | tdep->sc_reg_offset = amd64fbsd_sc_reg_offset; | |
477f40d1 | 290 | tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset); |
7e654c37 | 291 | |
97de3545 JB |
292 | tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET; |
293 | ||
294 | /* Iterate over core file register note sections. */ | |
295 | set_gdbarch_iterate_over_regset_sections | |
296 | (gdbarch, amd64fbsd_iterate_over_regset_sections); | |
297 | ||
298 | set_gdbarch_core_read_description (gdbarch, | |
299 | amd64fbsd_core_read_description); | |
300 | ||
1c02b2a5 MK |
301 | /* FreeBSD provides a user-level threads implementation. */ |
302 | bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread); | |
303 | bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread); | |
304 | ||
7e654c37 MK |
305 | /* FreeBSD uses SVR4-style shared libraries. */ |
306 | set_solib_svr4_fetch_link_map_offsets | |
307 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
68cc0bfb MK |
308 | } |
309 | \f | |
310 | ||
311 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
312 | void _initialize_amd64fbsd_tdep (void); | |
313 | ||
314 | void | |
315 | _initialize_amd64fbsd_tdep (void) | |
316 | { | |
317 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, | |
318 | GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi); | |
319 | } |