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25630444 | 1 | /* Native-dependent code for FreeBSD/i386. |
5d93ae8c | 2 | |
4a94e368 | 3 | Copyright (C) 2001-2022 Free Software Foundation, Inc. |
25630444 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 |
25630444 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/>. */ |
25630444 MK |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
22 | #include "regcache.h" | |
9692934b | 23 | #include "target.h" |
25630444 MK |
24 | |
25 | #include <sys/types.h> | |
26 | #include <sys/ptrace.h> | |
27 | #include <sys/sysctl.h> | |
cf424aef | 28 | #include <sys/user.h> |
25630444 | 29 | |
9692934b | 30 | #include "fbsd-nat.h" |
f0925262 | 31 | #include "i386-tdep.h" |
00d7af04 JB |
32 | #include "i386-fbsd-tdep.h" |
33 | #include "i387-tdep.h" | |
df7e5265 | 34 | #include "x86-nat.h" |
268a13a5 | 35 | #include "gdbsupport/x86-xstate.h" |
03b62bbb | 36 | #include "x86-bsd-nat.h" |
f0925262 | 37 | |
f6ac5f3d | 38 | class i386_fbsd_nat_target final |
00d7af04 | 39 | : public x86bsd_nat_target<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 | void resume (ptid_t, int, enum gdb_signal) override; | |
48 | ||
711b0b66 | 49 | #if defined(HAVE_PT_GETDBREGS) |
57810aa7 | 50 | bool supports_stopped_by_hw_breakpoint () override; |
f6ac5f3d PA |
51 | #endif |
52 | }; | |
53 | ||
54 | static i386_fbsd_nat_target the_i386_fbsd_nat_target; | |
55 | ||
00d7af04 JB |
56 | #ifdef PT_GETXSTATE_INFO |
57 | static size_t xsave_len; | |
58 | #endif | |
59 | ||
00d7af04 | 60 | static int have_ptrace_xmmregs; |
00d7af04 JB |
61 | |
62 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
63 | for all registers. */ | |
64 | ||
65 | void | |
66 | i386_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) | |
67 | { | |
68 | struct gdbarch *gdbarch = regcache->arch (); | |
69 | #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE) | |
70 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
71 | #endif | |
72 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
73 | ||
74 | if (fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS, | |
75 | &i386_fbsd_gregset)) | |
76 | { | |
77 | if (regnum != -1) | |
78 | return; | |
79 | } | |
80 | ||
81 | #ifdef PT_GETFSBASE | |
82 | if (regnum == -1 || regnum == I386_FSBASE_REGNUM) | |
83 | { | |
84 | register_t base; | |
85 | ||
86 | if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
87 | perror_with_name (_("Couldn't get segment register fs_base")); | |
88 | ||
89 | regcache->raw_supply (I386_FSBASE_REGNUM, &base); | |
90 | if (regnum != -1) | |
91 | return; | |
92 | } | |
93 | #endif | |
94 | #ifdef PT_GETGSBASE | |
95 | if (regnum == -1 || regnum == I386_GSBASE_REGNUM) | |
96 | { | |
97 | register_t base; | |
98 | ||
99 | if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
100 | perror_with_name (_("Couldn't get segment register gs_base")); | |
101 | ||
102 | regcache->raw_supply (I386_GSBASE_REGNUM, &base); | |
103 | if (regnum != -1) | |
104 | return; | |
105 | } | |
106 | #endif | |
107 | ||
108 | /* There is no i386_fxsave_supplies or i386_xsave_supplies. | |
109 | Instead, the earlier register sets return early if the request | |
110 | was for a specific register that was already satisified to avoid | |
111 | fetching the FPU/XSAVE state unnecessarily. */ | |
112 | ||
113 | #ifdef PT_GETXSTATE_INFO | |
114 | if (xsave_len != 0) | |
115 | { | |
116 | void *xstateregs = alloca (xsave_len); | |
117 | ||
118 | if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) | |
119 | perror_with_name (_("Couldn't get extended state status")); | |
120 | ||
121 | i387_supply_xsave (regcache, regnum, xstateregs); | |
122 | return; | |
123 | } | |
124 | #endif | |
00d7af04 JB |
125 | if (have_ptrace_xmmregs != 0) |
126 | { | |
127 | char xmmregs[I387_SIZEOF_FXSAVE]; | |
128 | ||
129 | if (ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) | |
130 | perror_with_name (_("Couldn't get XMM registers")); | |
131 | ||
132 | i387_supply_fxsave (regcache, regnum, xmmregs); | |
133 | return; | |
134 | } | |
00d7af04 JB |
135 | |
136 | struct fpreg fpregs; | |
137 | ||
138 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
139 | perror_with_name (_("Couldn't get floating point status")); | |
140 | ||
141 | i387_supply_fsave (regcache, regnum, &fpregs); | |
142 | } | |
143 | ||
144 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
145 | this for all registers. */ | |
146 | ||
147 | void | |
148 | i386_fbsd_nat_target::store_registers (struct regcache *regcache, int regnum) | |
149 | { | |
150 | struct gdbarch *gdbarch = regcache->arch (); | |
151 | #if defined(PT_GETFSBASE) || defined(PT_GETGSBASE) | |
152 | const struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
153 | #endif | |
154 | pid_t pid = get_ptrace_pid (regcache->ptid ()); | |
155 | ||
156 | if (store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS, | |
157 | &i386_fbsd_gregset)) | |
158 | { | |
159 | if (regnum != -1) | |
160 | return; | |
161 | } | |
162 | ||
163 | #ifdef PT_SETFSBASE | |
164 | if (regnum == -1 || regnum == I386_FSBASE_REGNUM) | |
165 | { | |
166 | register_t base; | |
167 | ||
168 | regcache->raw_collect (I386_FSBASE_REGNUM, &base); | |
169 | ||
170 | if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
171 | perror_with_name (_("Couldn't write segment register fs_base")); | |
172 | if (regnum != -1) | |
173 | return; | |
174 | } | |
175 | #endif | |
176 | #ifdef PT_SETGSBASE | |
177 | if (regnum == -1 || regnum == I386_GSBASE_REGNUM) | |
178 | { | |
179 | register_t base; | |
180 | ||
181 | regcache->raw_collect (I386_GSBASE_REGNUM, &base); | |
182 | ||
183 | if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1) | |
184 | perror_with_name (_("Couldn't write segment register gs_base")); | |
185 | if (regnum != -1) | |
186 | return; | |
187 | } | |
188 | #endif | |
189 | ||
190 | /* There is no i386_fxsave_supplies or i386_xsave_supplies. | |
191 | Instead, the earlier register sets return early if the request | |
192 | was for a specific register that was already satisified to avoid | |
193 | fetching the FPU/XSAVE state unnecessarily. */ | |
194 | ||
195 | #ifdef PT_GETXSTATE_INFO | |
196 | if (xsave_len != 0) | |
197 | { | |
198 | void *xstateregs = alloca (xsave_len); | |
199 | ||
200 | if (ptrace (PT_GETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) | |
201 | perror_with_name (_("Couldn't get extended state status")); | |
202 | ||
203 | i387_collect_xsave (regcache, regnum, xstateregs, 0); | |
204 | ||
205 | if (ptrace (PT_SETXSTATE, pid, (PTRACE_TYPE_ARG3) xstateregs, xsave_len) | |
206 | == -1) | |
207 | perror_with_name (_("Couldn't write extended state status")); | |
208 | return; | |
209 | } | |
210 | #endif | |
00d7af04 JB |
211 | if (have_ptrace_xmmregs != 0) |
212 | { | |
213 | char xmmregs[I387_SIZEOF_FXSAVE]; | |
214 | ||
215 | if (ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) | |
216 | perror_with_name (_("Couldn't get XMM registers")); | |
217 | ||
218 | i387_collect_fxsave (regcache, regnum, xmmregs); | |
219 | ||
220 | if (ptrace (PT_SETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) | |
221 | perror_with_name (_("Couldn't write XMM registers")); | |
222 | return; | |
223 | } | |
00d7af04 JB |
224 | |
225 | struct fpreg fpregs; | |
226 | ||
227 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
228 | perror_with_name (_("Couldn't get floating point status")); | |
229 | ||
230 | i387_collect_fsave (regcache, regnum, &fpregs); | |
231 | ||
232 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) | |
233 | perror_with_name (_("Couldn't write floating point status")); | |
234 | } | |
235 | ||
9692934b MK |
236 | /* Resume execution of the inferior process. If STEP is nonzero, |
237 | single-step it. If SIGNAL is nonzero, give it that signal. */ | |
25630444 | 238 | |
f6ac5f3d PA |
239 | void |
240 | i386_fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal) | |
25630444 | 241 | { |
e99b03dc | 242 | pid_t pid = ptid.pid (); |
25630444 MK |
243 | int request = PT_STEP; |
244 | ||
245 | if (pid == -1) | |
246 | /* Resume all threads. This only gets used in the non-threaded | |
247 | case, where "resume all threads" and "resume inferior_ptid" are | |
248 | the same. */ | |
e99b03dc | 249 | pid = inferior_ptid.pid (); |
25630444 MK |
250 | |
251 | if (!step) | |
252 | { | |
594f7785 | 253 | struct regcache *regcache = get_current_regcache (); |
f0925262 | 254 | ULONGEST eflags; |
25630444 MK |
255 | |
256 | /* Workaround for a bug in FreeBSD. Make sure that the trace | |
24b21115 SM |
257 | flag is off when doing a continue. There is a code path |
258 | through the kernel which leaves the flag set when it should | |
259 | have been cleared. If a process has a signal pending (such | |
260 | as SIGALRM) and we do a PT_STEP, the process never really has | |
261 | a chance to run because the kernel needs to notify the | |
262 | debugger that a signal is being sent. Therefore, the process | |
263 | never goes through the kernel's trap() function which would | |
264 | normally clear it. */ | |
25630444 | 265 | |
594f7785 | 266 | regcache_cooked_read_unsigned (regcache, I386_EFLAGS_REGNUM, |
f0925262 | 267 | &eflags); |
25630444 | 268 | if (eflags & 0x0100) |
594f7785 | 269 | regcache_cooked_write_unsigned (regcache, I386_EFLAGS_REGNUM, |
f0925262 | 270 | eflags & ~0x0100); |
25630444 MK |
271 | |
272 | request = PT_CONTINUE; | |
273 | } | |
274 | ||
275 | /* An addres of (caddr_t) 1 tells ptrace to continue from where it | |
276 | was. (If GDB wanted it to start some other way, we have already | |
277 | written a new PC value to the child.) */ | |
278 | if (ptrace (request, pid, (caddr_t) 1, | |
2ea28649 | 279 | gdb_signal_to_host (signal)) == -1) |
e2e0b3e5 | 280 | perror_with_name (("ptrace")); |
25630444 MK |
281 | } |
282 | \f | |
2e0c3539 MK |
283 | |
284 | /* Support for debugging kernel virtual memory images. */ | |
285 | ||
2e0c3539 MK |
286 | #include <machine/pcb.h> |
287 | ||
288 | #include "bsd-kvm.h" | |
289 | ||
290 | static int | |
291 | i386fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
292 | { | |
293 | /* The following is true for FreeBSD 4.7: | |
294 | ||
295 | The pcb contains %eip, %ebx, %esp, %ebp, %esi, %edi and %gs. | |
296 | This accounts for all callee-saved registers specified by the | |
297 | psABI and then some. Here %esp contains the stack pointer at the | |
298 | point just after the call to cpu_switch(). From this information | |
299 | we reconstruct the register state as it would look when we just | |
300 | returned from cpu_switch(). */ | |
301 | ||
302 | /* The stack pointer shouldn't be zero. */ | |
303 | if (pcb->pcb_esp == 0) | |
304 | return 0; | |
305 | ||
306 | pcb->pcb_esp += 4; | |
73e1c03f SM |
307 | regcache->raw_supply (I386_EDI_REGNUM, &pcb->pcb_edi); |
308 | regcache->raw_supply (I386_ESI_REGNUM, &pcb->pcb_esi); | |
309 | regcache->raw_supply (I386_EBP_REGNUM, &pcb->pcb_ebp); | |
310 | regcache->raw_supply (I386_ESP_REGNUM, &pcb->pcb_esp); | |
311 | regcache->raw_supply (I386_EBX_REGNUM, &pcb->pcb_ebx); | |
312 | regcache->raw_supply (I386_EIP_REGNUM, &pcb->pcb_eip); | |
313 | regcache->raw_supply (I386_GS_REGNUM, &pcb->pcb_gs); | |
2e0c3539 MK |
314 | |
315 | return 1; | |
316 | } | |
317 | \f | |
318 | ||
f6ac5f3d | 319 | /* Implement the read_description method. */ |
97de3545 | 320 | |
f6ac5f3d PA |
321 | const struct target_desc * |
322 | i386_fbsd_nat_target::read_description () | |
97de3545 | 323 | { |
00d7af04 | 324 | #ifdef PT_GETXSTATE_INFO |
97de3545 JB |
325 | static int xsave_probed; |
326 | static uint64_t xcr0; | |
00d7af04 | 327 | #endif |
00d7af04 | 328 | static int xmm_probed; |
97de3545 | 329 | |
00d7af04 | 330 | #ifdef PT_GETXSTATE_INFO |
97de3545 JB |
331 | if (!xsave_probed) |
332 | { | |
333 | struct ptrace_xstate_info info; | |
334 | ||
e99b03dc | 335 | if (ptrace (PT_GETXSTATE_INFO, inferior_ptid.pid (), |
97de3545 JB |
336 | (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0) |
337 | { | |
00d7af04 | 338 | xsave_len = info.xsave_len; |
97de3545 JB |
339 | xcr0 = info.xsave_mask; |
340 | } | |
341 | xsave_probed = 1; | |
342 | } | |
343 | ||
00d7af04 JB |
344 | if (xsave_len != 0) |
345 | return i386_target_description (xcr0, true); | |
346 | #endif | |
347 | ||
00d7af04 JB |
348 | if (!xmm_probed) |
349 | { | |
350 | char xmmregs[I387_SIZEOF_FXSAVE]; | |
351 | ||
352 | if (ptrace (PT_GETXMMREGS, inferior_ptid.pid (), | |
353 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) | |
354 | have_ptrace_xmmregs = 1; | |
355 | xmm_probed = 1; | |
356 | } | |
357 | ||
358 | if (have_ptrace_xmmregs) | |
359 | return i386_target_description (X86_XSTATE_SSE_MASK, true); | |
ca1fa5ee | 360 | |
00d7af04 | 361 | return i386_target_description (X86_XSTATE_X87_MASK, true); |
97de3545 | 362 | } |
97de3545 | 363 | |
711b0b66 | 364 | #if defined(HAVE_PT_GETDBREGS) |
f6ac5f3d | 365 | /* Implement the supports_stopped_by_hw_breakpoints method. */ |
9bb9e8ad | 366 | |
57810aa7 | 367 | bool |
f6ac5f3d PA |
368 | i386_fbsd_nat_target::supports_stopped_by_hw_breakpoint () |
369 | { | |
57810aa7 | 370 | return true; |
f6ac5f3d | 371 | } |
97de3545 | 372 | #endif |
9bb9e8ad | 373 | |
6c265988 | 374 | void _initialize_i386fbsd_nat (); |
f6ac5f3d | 375 | void |
6c265988 | 376 | _initialize_i386fbsd_nat () |
f6ac5f3d | 377 | { |
d9f719f1 | 378 | add_inf_child_target (&the_i386_fbsd_nat_target); |
9692934b | 379 | |
771e236c MK |
380 | /* Support debugging kernel virtual memory images. */ |
381 | bsd_kvm_add_target (i386fbsd_supply_pcb); | |
25630444 | 382 | } |