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68cc0bfb | 1 | /* Native-dependent code for FreeBSD/amd64. |
2a6d284d | 2 | |
213516ef | 3 | Copyright (C) 2003-2023 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" | |
4de283e4 TT |
21 | #include "inferior.h" |
22 | #include "regcache.h" | |
23 | #include "target.h" | |
68cc0bfb | 24 | |
68cc0bfb | 25 | #include <signal.h> |
4de283e4 | 26 | #include <sys/types.h> |
68cc0bfb MK |
27 | #include <sys/ptrace.h> |
28 | #include <sys/sysctl.h> | |
cf424aef | 29 | #include <sys/user.h> |
4de283e4 | 30 | #include <machine/reg.h> |
68cc0bfb | 31 | |
4de283e4 | 32 | #include "amd64-tdep.h" |
00d7af04 | 33 | #include "amd64-fbsd-tdep.h" |
4de283e4 | 34 | #include "amd64-nat.h" |
d55e5aa6 | 35 | #include "x86-nat.h" |
268a13a5 | 36 | #include "gdbsupport/x86-xstate.h" |
a49ce729 | 37 | #include "x86-fbsd-nat.h" |
68cc0bfb | 38 | |
a49ce729 | 39 | class amd64_fbsd_nat_target final : public x86_fbsd_nat_target |
f6ac5f3d PA |
40 | { |
41 | public: | |
00d7af04 JB |
42 | void fetch_registers (struct regcache *, int) override; |
43 | void store_registers (struct regcache *, int) override; | |
44 | ||
f6ac5f3d | 45 | const struct target_desc *read_description () override; |
f6ac5f3d PA |
46 | }; |
47 | ||
48 | static amd64_fbsd_nat_target the_amd64_fbsd_nat_target; | |
49 | ||
00d7af04 JB |
50 | #ifdef PT_GETXSTATE_INFO |
51 | static size_t xsave_len; | |
52 | #endif | |
53 | ||
54 | /* This is a layout of the amd64 'struct reg' but with i386 | |
55 | registers. */ | |
68cc0bfb | 56 | |
00d7af04 | 57 | static const struct regcache_map_entry amd64_fbsd32_gregmap[] = |
68cc0bfb | 58 | { |
00d7af04 JB |
59 | { 8, REGCACHE_MAP_SKIP, 8 }, |
60 | { 1, I386_EDI_REGNUM, 8 }, | |
61 | { 1, I386_ESI_REGNUM, 8 }, | |
62 | { 1, I386_EBP_REGNUM, 8 }, | |
63 | { 1, I386_EBX_REGNUM, 8 }, | |
64 | { 1, I386_EDX_REGNUM, 8 }, | |
65 | { 1, I386_ECX_REGNUM, 8 }, | |
66 | { 1, I386_EAX_REGNUM, 8 }, | |
67 | { 1, REGCACHE_MAP_SKIP, 4 }, /* trapno */ | |
68 | { 1, I386_FS_REGNUM, 2 }, | |
69 | { 1, I386_GS_REGNUM, 2 }, | |
70 | { 1, REGCACHE_MAP_SKIP, 4 }, /* err */ | |
71 | { 1, I386_ES_REGNUM, 2 }, | |
72 | { 1, I386_DS_REGNUM, 2 }, | |
73 | { 1, I386_EIP_REGNUM, 8 }, | |
74 | { 1, I386_CS_REGNUM, 8 }, | |
75 | { 1, I386_EFLAGS_REGNUM, 8 }, | |
76 | { 1, I386_ESP_REGNUM, 0 }, | |
77 | { 1, I386_SS_REGNUM, 8 }, | |
78 | { 0 } | |
68cc0bfb | 79 | }; |
2a6d284d | 80 | |
00d7af04 JB |
81 | static const struct regset amd64_fbsd32_gregset = |
82 | { | |
83 | amd64_fbsd32_gregmap, regcache_supply_regset, regcache_collect_regset | |
84 | }; | |
68cc0bfb | 85 | |
00d7af04 | 86 | /* Return the regset to use for 'struct reg' for the GDBARCH. */ |
68cc0bfb | 87 | |
00d7af04 JB |
88 | static const struct regset * |
89 | find_gregset (struct gdbarch *gdbarch) | |
2a6d284d | 90 | { |
00d7af04 JB |
91 | if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) |
92 | return &amd64_fbsd32_gregset; | |
93 | else | |
94 | return &amd64_fbsd_gregset; | |
95 | } | |
96 | ||
97 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
98 | for all registers. */ | |
99 | ||
100 | void | |
101 | amd64_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) | |
102 | { | |
103 | struct gdbarch *gdbarch = regcache->arch (); | |
104 | #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE) | |
08106042 | 105 | const i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch); |
00d7af04 JB |
106 | #endif |
107 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
108 | const struct regset *gregset = find_gregset (gdbarch); | |
109 | ||
110 | if (fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS, gregset)) | |
111 | { | |
112 | if (regnum != -1) | |
113 | return; | |
114 | } | |
115 | ||
116 | #ifdef PT_GETFSBASE | |
117 | if (regnum == -1 || regnum == tdep->fsbase_regnum) | |
118 | { | |
119 | register_t base; | |
120 | ||
121 | if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
122 | perror_with_name (_("Couldn't get segment register fs_base")); | |
123 | ||
124 | regcache->raw_supply (tdep->fsbase_regnum, &base); | |
125 | if (regnum != -1) | |
126 | return; | |
127 | } | |
128 | #endif | |
129 | #ifdef PT_GETGSBASE | |
130 | if (regnum == -1 || regnum == tdep->fsbase_regnum + 1) | |
131 | { | |
132 | register_t base; | |
133 | ||
134 | if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
135 | perror_with_name (_("Couldn't get segment register gs_base")); | |
136 | ||
137 | regcache->raw_supply (tdep->fsbase_regnum + 1, &base); | |
138 | if (regnum != -1) | |
139 | return; | |
140 | } | |
141 | #endif | |
142 | ||
143 | /* There is no amd64_fxsave_supplies or amd64_xsave_supplies. | |
144 | Instead, the earlier register sets return early if the request | |
145 | was for a specific register that was already satisified to avoid | |
146 | fetching the FPU/XSAVE state unnecessarily. */ | |
147 | ||
148 | #ifdef PT_GETXSTATE_INFO | |
149 | if (xsave_len != 0) | |
150 | { | |
151 | void *xstateregs = alloca (xsave_len); | |
152 | ||
153 | if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) | |
154 | perror_with_name (_("Couldn't get extended state status")); | |
155 | ||
156 | amd64_supply_xsave (regcache, regnum, xstateregs); | |
157 | return; | |
158 | } | |
159 | #endif | |
160 | ||
161 | struct fpreg fpregs; | |
162 | ||
163 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
164 | perror_with_name (_("Couldn't get floating point status")); | |
165 | ||
166 | amd64_supply_fxsave (regcache, regnum, &fpregs); | |
167 | } | |
168 | ||
169 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
170 | this for all registers. */ | |
171 | ||
172 | void | |
173 | amd64_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum) | |
174 | { | |
175 | struct gdbarch *gdbarch = regcache->arch (); | |
176 | #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE) | |
08106042 | 177 | const i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch); |
00d7af04 JB |
178 | #endif |
179 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
180 | const struct regset *gregset = find_gregset (gdbarch); | |
181 | ||
182 | if (store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS, | |
183 | gregset)) | |
184 | { | |
185 | if (regnum != -1) | |
186 | return; | |
187 | } | |
188 | ||
189 | #ifdef PT_SETFSBASE | |
190 | if (regnum == -1 || regnum == tdep->fsbase_regnum) | |
191 | { | |
192 | register_t base; | |
193 | ||
194 | /* Clear the full base value to support 32-bit targets. */ | |
195 | base = 0; | |
196 | regcache->raw_collect (tdep->fsbase_regnum, &base); | |
197 | ||
198 | if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
199 | perror_with_name (_("Couldn't write segment register fs_base")); | |
200 | if (regnum != -1) | |
201 | return; | |
202 | } | |
203 | #endif | |
204 | #ifdef PT_SETGSBASE | |
205 | if (regnum == -1 || regnum == tdep->fsbase_regnum + 1) | |
206 | { | |
207 | register_t base; | |
208 | ||
209 | /* Clear the full base value to support 32-bit targets. */ | |
210 | base = 0; | |
211 | regcache->raw_collect (tdep->fsbase_regnum + 1, &base); | |
212 | ||
213 | if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
214 | perror_with_name (_("Couldn't write segment register gs_base")); | |
215 | if (regnum != -1) | |
216 | return; | |
217 | } | |
218 | #endif | |
219 | ||
220 | /* There is no amd64_fxsave_supplies or amd64_xsave_supplies. | |
221 | Instead, the earlier register sets return early if the request | |
222 | was for a specific register that was already satisified to avoid | |
223 | fetching the FPU/XSAVE state unnecessarily. */ | |
224 | ||
225 | #ifdef PT_GETXSTATE_INFO | |
226 | if (xsave_len != 0) | |
227 | { | |
228 | void *xstateregs = alloca (xsave_len); | |
229 | ||
230 | if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) | |
231 | perror_with_name (_("Couldn't get extended state status")); | |
232 | ||
233 | amd64_collect_xsave (regcache, regnum, xstateregs, 0); | |
234 | ||
235 | if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, | |
236 | xsave_len) == -1) | |
237 | perror_with_name (_("Couldn't write extended state status")); | |
238 | return; | |
239 | } | |
240 | #endif | |
241 | ||
242 | struct fpreg fpregs; | |
243 | ||
244 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
245 | perror_with_name (_("Couldn't get floating point status")); | |
246 | ||
247 | amd64_collect_fxsave (regcache, regnum, &fpregs); | |
248 | ||
249 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
250 | perror_with_name (_("Couldn't write floating point status")); | |
251 | } | |
68cc0bfb | 252 | |
315c4276 MK |
253 | /* Support for debugging kernel virtual memory images. */ |
254 | ||
315c4276 | 255 | #include <machine/pcb.h> |
1f596238 | 256 | #include <osreldate.h> |
315c4276 MK |
257 | |
258 | #include "bsd-kvm.h" | |
259 | ||
260 | static int | |
261 | amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
262 | { | |
263 | /* The following is true for FreeBSD 5.2: | |
264 | ||
265 | The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, | |
266 | %ds, %es, %fs and %gs. This accounts for all callee-saved | |
267 | registers specified by the psABI and then some. Here %esp | |
268 | contains the stack pointer at the point just after the call to | |
269 | cpu_switch(). From this information we reconstruct the register | |
270 | state as it would like when we just returned from cpu_switch(). */ | |
271 | ||
272 | /* The stack pointer shouldn't be zero. */ | |
273 | if (pcb->pcb_rsp == 0) | |
274 | return 0; | |
275 | ||
276 | pcb->pcb_rsp += 8; | |
73e1c03f SM |
277 | regcache->raw_supply (AMD64_RIP_REGNUM, &pcb->pcb_rip); |
278 | regcache->raw_supply (AMD64_RBX_REGNUM, &pcb->pcb_rbx); | |
279 | regcache->raw_supply (AMD64_RSP_REGNUM, &pcb->pcb_rsp); | |
280 | regcache->raw_supply (AMD64_RBP_REGNUM, &pcb->pcb_rbp); | |
281 | regcache->raw_supply (12, &pcb->pcb_r12); | |
282 | regcache->raw_supply (13, &pcb->pcb_r13); | |
283 | regcache->raw_supply (14, &pcb->pcb_r14); | |
284 | regcache->raw_supply (15, &pcb->pcb_r15); | |
c1dec97b | 285 | #if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075) |
ffeecffa JB |
286 | /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only |
287 | up until __FreeBSD_version 800074: The removal of these fields | |
288 | occurred on 2009-04-01 while the __FreeBSD_version number was | |
289 | bumped to 800075 on 2009-04-06. So 800075 is the closest version | |
290 | number where we should not try to access these fields. */ | |
73e1c03f SM |
291 | regcache->raw_supply (AMD64_DS_REGNUM, &pcb->pcb_ds); |
292 | regcache->raw_supply (AMD64_ES_REGNUM, &pcb->pcb_es); | |
293 | regcache->raw_supply (AMD64_FS_REGNUM, &pcb->pcb_fs); | |
294 | regcache->raw_supply (AMD64_GS_REGNUM, &pcb->pcb_gs); | |
1f596238 | 295 | #endif |
315c4276 MK |
296 | |
297 | return 1; | |
298 | } | |
299 | \f | |
300 | ||
f6ac5f3d | 301 | /* Implement the read_description method. */ |
97de3545 | 302 | |
f6ac5f3d PA |
303 | const struct target_desc * |
304 | amd64_fbsd_nat_target::read_description () | |
97de3545 JB |
305 | { |
306 | #ifdef PT_GETXSTATE_INFO | |
307 | static int xsave_probed; | |
308 | static uint64_t xcr0; | |
309 | #endif | |
310 | struct reg regs; | |
311 | int is64; | |
312 | ||
e99b03dc | 313 | if (ptrace (PT_GETREGS, inferior_ptid.pid (), |
97de3545 JB |
314 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
315 | perror_with_name (_("Couldn't get registers")); | |
316 | is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL)); | |
317 | #ifdef PT_GETXSTATE_INFO | |
318 | if (!xsave_probed) | |
319 | { | |
320 | struct ptrace_xstate_info info; | |
321 | ||
e99b03dc | 322 | if (ptrace (PT_GETXSTATE_INFO, inferior_ptid.pid (), |
97de3545 JB |
323 | (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0) |
324 | { | |
00d7af04 | 325 | xsave_len = info.xsave_len; |
97de3545 JB |
326 | xcr0 = info.xsave_mask; |
327 | } | |
328 | xsave_probed = 1; | |
329 | } | |
330 | ||
00d7af04 | 331 | if (xsave_len != 0) |
97de3545 JB |
332 | { |
333 | if (is64) | |
41206e32 | 334 | return amd64_target_description (xcr0, true); |
97de3545 | 335 | else |
dd6876c9 | 336 | return i386_target_description (xcr0, true); |
97de3545 JB |
337 | } |
338 | #endif | |
339 | if (is64) | |
41206e32 | 340 | return amd64_target_description (X86_XSTATE_SSE_MASK, true); |
97de3545 | 341 | else |
dd6876c9 | 342 | return i386_target_description (X86_XSTATE_SSE_MASK, true); |
97de3545 JB |
343 | } |
344 | ||
6c265988 | 345 | void _initialize_amd64fbsd_nat (); |
68cc0bfb | 346 | void |
6c265988 | 347 | _initialize_amd64fbsd_nat () |
68cc0bfb | 348 | { |
d9f719f1 | 349 | add_inf_child_target (&the_amd64_fbsd_nat_target); |
6a5c78a3 MK |
350 | |
351 | /* Support debugging kernel virtual memory images. */ | |
352 | bsd_kvm_add_target (amd64fbsd_supply_pcb); | |
68cc0bfb | 353 | } |