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68cc0bfb | 1 | /* Target-dependent code for FreeBSD/amd64. |
477f40d1 | 2 | |
b811d2c2 | 3 | Copyright (C) 2003-2020 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" | |
d55e5aa6 | 24 | #include "regcache.h" |
4de283e4 | 25 | #include "osabi.h" |
97de3545 | 26 | #include "regset.h" |
4de283e4 | 27 | #include "i386-fbsd-tdep.h" |
268a13a5 | 28 | #include "gdbsupport/x86-xstate.h" |
4de283e4 TT |
29 | |
30 | #include "amd64-tdep.h" | |
31 | #include "fbsd-tdep.h" | |
7e654c37 | 32 | #include "solib-svr4.h" |
5b6d1e4f | 33 | #include "inferior.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 | ||
97de3545 JB |
153 | /* Implement the core_read_description gdbarch method. */ |
154 | ||
155 | static const struct target_desc * | |
156 | amd64fbsd_core_read_description (struct gdbarch *gdbarch, | |
157 | struct target_ops *target, | |
158 | bfd *abfd) | |
159 | { | |
41206e32 | 160 | return amd64_target_description (i386fbsd_core_read_xcr0 (abfd), true); |
97de3545 JB |
161 | } |
162 | ||
163 | /* Similar to amd64_supply_fpregset, but use XSAVE extended state. */ | |
164 | ||
165 | static void | |
166 | amd64fbsd_supply_xstateregset (const struct regset *regset, | |
167 | struct regcache *regcache, int regnum, | |
168 | const void *xstateregs, size_t len) | |
169 | { | |
170 | amd64_supply_xsave (regcache, regnum, xstateregs); | |
171 | } | |
172 | ||
173 | /* Similar to amd64_collect_fpregset, but use XSAVE extended state. */ | |
174 | ||
175 | static void | |
176 | amd64fbsd_collect_xstateregset (const struct regset *regset, | |
177 | const struct regcache *regcache, | |
178 | int regnum, void *xstateregs, size_t len) | |
179 | { | |
180 | amd64_collect_xsave (regcache, regnum, xstateregs, 1); | |
181 | } | |
182 | ||
183 | static const struct regset amd64fbsd_xstateregset = | |
184 | { | |
185 | NULL, | |
186 | amd64fbsd_supply_xstateregset, | |
187 | amd64fbsd_collect_xstateregset | |
188 | }; | |
189 | ||
190 | /* Iterate over core file register note sections. */ | |
191 | ||
192 | static void | |
193 | amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
194 | iterate_over_regset_sections_cb *cb, | |
195 | void *cb_data, | |
196 | const struct regcache *regcache) | |
197 | { | |
198 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
199 | ||
a616bb94 AH |
200 | cb (".reg", tdep->sizeof_gregset, tdep->sizeof_gregset, &i386_gregset, NULL, |
201 | cb_data); | |
202 | cb (".reg2", tdep->sizeof_fpregset, tdep->sizeof_fpregset, &amd64_fpregset, | |
203 | NULL, cb_data); | |
204 | cb (".reg-xstate", X86_XSTATE_SIZE (tdep->xcr0), X86_XSTATE_SIZE (tdep->xcr0), | |
97de3545 JB |
205 | &amd64fbsd_xstateregset, "XSAVE extended state", cb_data); |
206 | } | |
207 | ||
f5424cfa JB |
208 | /* Implement the get_thread_local_address gdbarch method. */ |
209 | ||
210 | static CORE_ADDR | |
211 | amd64fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid, | |
212 | CORE_ADDR lm_addr, CORE_ADDR offset) | |
213 | { | |
214 | struct regcache *regcache; | |
215 | ||
5b6d1e4f PA |
216 | regcache = get_thread_arch_regcache (current_inferior ()->process_target (), |
217 | ptid, gdbarch); | |
f5424cfa JB |
218 | |
219 | target_fetch_registers (regcache, AMD64_FSBASE_REGNUM); | |
220 | ||
221 | ULONGEST fsbase; | |
222 | if (regcache->cooked_read (AMD64_FSBASE_REGNUM, &fsbase) != REG_VALID) | |
223 | error (_("Unable to fetch %%fsbase")); | |
224 | ||
225 | CORE_ADDR dtv_addr = fsbase + gdbarch_ptr_bit (gdbarch) / 8; | |
226 | return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset); | |
227 | } | |
228 | ||
63807e1d | 229 | static void |
68cc0bfb MK |
230 | amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
231 | { | |
232 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
233 | ||
490496c3 AA |
234 | /* Generic FreeBSD support. */ |
235 | fbsd_init_abi (info, gdbarch); | |
236 | ||
68cc0bfb MK |
237 | /* Obviously FreeBSD is BSD-based. */ |
238 | i386bsd_init_abi (info, gdbarch); | |
239 | ||
477f40d1 MK |
240 | tdep->gregset_reg_offset = amd64fbsd_r_reg_offset; |
241 | tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset); | |
242 | tdep->sizeof_gregset = 22 * 8; | |
243 | ||
2434b019 | 244 | amd64_init_abi (info, gdbarch, |
41206e32 | 245 | amd64_target_description (X86_XSTATE_SSE_MASK, true)); |
68cc0bfb | 246 | |
cf424aef | 247 | tdep->sigtramp_p = amd64fbsd_sigtramp_p; |
10fc94a4 MK |
248 | tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr; |
249 | tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr; | |
68cc0bfb MK |
250 | tdep->sigcontext_addr = amd64fbsd_sigcontext_addr; |
251 | tdep->sc_reg_offset = amd64fbsd_sc_reg_offset; | |
477f40d1 | 252 | tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset); |
7e654c37 | 253 | |
97de3545 JB |
254 | tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET; |
255 | ||
256 | /* Iterate over core file register note sections. */ | |
257 | set_gdbarch_iterate_over_regset_sections | |
258 | (gdbarch, amd64fbsd_iterate_over_regset_sections); | |
259 | ||
260 | set_gdbarch_core_read_description (gdbarch, | |
261 | amd64fbsd_core_read_description); | |
262 | ||
7e654c37 MK |
263 | /* FreeBSD uses SVR4-style shared libraries. */ |
264 | set_solib_svr4_fetch_link_map_offsets | |
265 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
f5424cfa JB |
266 | |
267 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
268 | svr4_fetch_objfile_link_map); | |
269 | set_gdbarch_get_thread_local_address (gdbarch, | |
270 | amd64fbsd_get_thread_local_address); | |
68cc0bfb | 271 | } |
68cc0bfb | 272 | |
6c265988 | 273 | void _initialize_amd64fbsd_tdep (); |
68cc0bfb | 274 | void |
6c265988 | 275 | _initialize_amd64fbsd_tdep () |
68cc0bfb MK |
276 | { |
277 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, | |
1736a7bd | 278 | GDB_OSABI_FREEBSD, amd64fbsd_init_abi); |
68cc0bfb | 279 | } |