Commit | Line | Data |
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e6031aeb | 1 | /* Native-dependent code for modern i386 BSD's. |
3f63813d | 2 | |
32d0add0 | 3 | Copyright (C) 2000-2015 Free Software Foundation, Inc. |
e6031aeb 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 |
e6031aeb 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/>. */ |
e6031aeb MK |
19 | |
20 | #include "defs.h" | |
21 | #include "inferior.h" | |
4e052eda | 22 | #include "regcache.h" |
e6031aeb | 23 | |
b7247919 | 24 | #include <signal.h> |
e6031aeb MK |
25 | #include <sys/types.h> |
26 | #include <sys/ptrace.h> | |
27 | #include <machine/reg.h> | |
28 | #include <machine/frame.h> | |
29 | ||
57976e88 | 30 | #include "i386-tdep.h" |
1fc7d519 | 31 | #include "i387-tdep.h" |
9692934b MK |
32 | #include "i386bsd-nat.h" |
33 | #include "inf-ptrace.h" | |
b051bfa4 MK |
34 | \f |
35 | ||
e6031aeb MK |
36 | /* In older BSD versions we cannot get at some of the segment |
37 | registers. FreeBSD for example didn't support the %fs and %gs | |
38 | registers until the 3.0 release. We have autoconf checks for their | |
39 | presence, and deal gracefully with their absence. */ | |
40 | ||
6cfb2041 MK |
41 | /* Offset in `struct reg' where MEMBER is stored. */ |
42 | #define REG_OFFSET(member) offsetof (struct reg, member) | |
e6031aeb | 43 | |
6cfb2041 MK |
44 | /* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct |
45 | reg' where the GDB register REGNUM is stored. Unsupported | |
e6031aeb | 46 | registers are marked with `-1'. */ |
6cfb2041 | 47 | static int i386bsd_r_reg_offset[] = |
e6031aeb MK |
48 | { |
49 | REG_OFFSET (r_eax), | |
50 | REG_OFFSET (r_ecx), | |
51 | REG_OFFSET (r_edx), | |
2c48bda3 | 52 | REG_OFFSET (r_ebx), |
e6031aeb MK |
53 | REG_OFFSET (r_esp), |
54 | REG_OFFSET (r_ebp), | |
55 | REG_OFFSET (r_esi), | |
56 | REG_OFFSET (r_edi), | |
57 | REG_OFFSET (r_eip), | |
58 | REG_OFFSET (r_eflags), | |
59 | REG_OFFSET (r_cs), | |
60 | REG_OFFSET (r_ss), | |
61 | REG_OFFSET (r_ds), | |
62 | REG_OFFSET (r_es), | |
422ea4b8 | 63 | #ifdef HAVE_STRUCT_REG_R_FS |
e6031aeb MK |
64 | REG_OFFSET (r_fs), |
65 | #else | |
66 | -1, | |
67 | #endif | |
422ea4b8 | 68 | #ifdef HAVE_STRUCT_REG_R_GS |
e6031aeb MK |
69 | REG_OFFSET (r_gs) |
70 | #else | |
71 | -1 | |
72 | #endif | |
73 | }; | |
74 | ||
7e89e357 | 75 | /* Macro to determine if a register is fetched with PT_GETREGS. */ |
283accbc MK |
76 | #define GETREGS_SUPPLIES(regnum) \ |
77 | ((0 <= (regnum) && (regnum) <= 15)) | |
7e89e357 JT |
78 | |
79 | #ifdef HAVE_PT_GETXMMREGS | |
80 | /* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1 | |
81 | so that we try PT_GETXMMREGS the first time around. */ | |
82 | static int have_ptrace_xmmregs = -1; | |
83 | #endif | |
97de3545 JB |
84 | |
85 | #ifdef PT_GETXSTATE_INFO | |
86 | size_t i386bsd_xsave_len; | |
87 | #endif | |
e6031aeb MK |
88 | \f |
89 | ||
6cfb2041 | 90 | /* Supply the general-purpose registers in GREGS, to REGCACHE. */ |
e6031aeb | 91 | |
1fc7d519 | 92 | static void |
6cfb2041 | 93 | i386bsd_supply_gregset (struct regcache *regcache, const void *gregs) |
e6031aeb | 94 | { |
6cfb2041 | 95 | const char *regs = gregs; |
feae6502 | 96 | int regnum; |
e6031aeb | 97 | |
6cfb2041 | 98 | for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++) |
e6031aeb | 99 | { |
6cfb2041 MK |
100 | int offset = i386bsd_r_reg_offset[regnum]; |
101 | ||
102 | if (offset != -1) | |
103 | regcache_raw_supply (regcache, regnum, regs + offset); | |
e6031aeb MK |
104 | } |
105 | } | |
106 | ||
6cfb2041 MK |
107 | /* Collect register REGNUM from REGCACHE and store its contents in |
108 | GREGS. If REGNUM is -1, collect and store all appropriate | |
109 | registers. */ | |
e6031aeb | 110 | |
1fc7d519 | 111 | static void |
6cfb2041 MK |
112 | i386bsd_collect_gregset (const struct regcache *regcache, |
113 | void *gregs, int regnum) | |
e6031aeb | 114 | { |
6cfb2041 | 115 | char *regs = gregs; |
e6031aeb MK |
116 | int i; |
117 | ||
6cfb2041 MK |
118 | for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++) |
119 | { | |
120 | if (regnum == -1 || regnum == i) | |
121 | { | |
122 | int offset = i386bsd_r_reg_offset[i]; | |
e6031aeb | 123 | |
6cfb2041 MK |
124 | if (offset != -1) |
125 | regcache_raw_collect (regcache, i, regs + offset); | |
126 | } | |
127 | } | |
128 | } | |
e6031aeb | 129 | |
283accbc | 130 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
e6031aeb MK |
131 | for all registers (including the floating point registers). */ |
132 | ||
9692934b | 133 | static void |
28439f5e PA |
134 | i386bsd_fetch_inferior_registers (struct target_ops *ops, |
135 | struct regcache *regcache, int regnum) | |
e6031aeb | 136 | { |
283accbc | 137 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 138 | { |
6cfb2041 | 139 | struct reg regs; |
7e89e357 | 140 | |
dfd4cc63 | 141 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 142 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 143 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 144 | |
56be3814 | 145 | i386bsd_supply_gregset (regcache, ®s); |
283accbc | 146 | if (regnum != -1) |
7e89e357 JT |
147 | return; |
148 | } | |
e6031aeb | 149 | |
283accbc | 150 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 151 | { |
6cfb2041 | 152 | struct fpreg fpregs; |
7e89e357 JT |
153 | #ifdef HAVE_PT_GETXMMREGS |
154 | char xmmregs[512]; | |
97de3545 JB |
155 | #endif |
156 | ||
157 | #ifdef PT_GETXSTATE_INFO | |
158 | if (i386bsd_xsave_len != 0) | |
159 | { | |
160 | char *xstateregs; | |
161 | ||
162 | xstateregs = alloca (i386bsd_xsave_len); | |
163 | if (ptrace (PT_GETXSTATE, ptid_get_pid (inferior_ptid), | |
164 | (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) | |
165 | perror_with_name (_("Couldn't get extended state status")); | |
7e89e357 | 166 | |
97de3545 JB |
167 | i387_supply_xsave (regcache, -1, xstateregs); |
168 | return; | |
169 | } | |
170 | #endif | |
171 | ||
172 | #ifdef HAVE_PT_GETXMMREGS | |
a144416f | 173 | if (have_ptrace_xmmregs != 0 |
dfd4cc63 | 174 | && ptrace(PT_GETXMMREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 175 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
176 | { |
177 | have_ptrace_xmmregs = 1; | |
56be3814 | 178 | i387_supply_fxsave (regcache, -1, xmmregs); |
7e89e357 JT |
179 | } |
180 | else | |
181 | { | |
97de3545 JB |
182 | have_ptrace_xmmregs = 0; |
183 | #endif | |
dfd4cc63 | 184 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 185 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 186 | perror_with_name (_("Couldn't get floating point status")); |
e6031aeb | 187 | |
56be3814 | 188 | i387_supply_fsave (regcache, -1, &fpregs); |
97de3545 | 189 | #ifdef HAVE_PT_GETXMMREGS |
7e89e357 | 190 | } |
7e89e357 | 191 | #endif |
e6031aeb | 192 | } |
b051bfa4 | 193 | } |
e6031aeb | 194 | |
283accbc | 195 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
e6031aeb MK |
196 | this for all registers (including the floating point registers). */ |
197 | ||
9692934b | 198 | static void |
28439f5e PA |
199 | i386bsd_store_inferior_registers (struct target_ops *ops, |
200 | struct regcache *regcache, int regnum) | |
e6031aeb | 201 | { |
283accbc | 202 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 203 | { |
6cfb2041 | 204 | struct reg regs; |
7e89e357 | 205 | |
dfd4cc63 | 206 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 207 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 208 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 209 | |
56be3814 | 210 | i386bsd_collect_gregset (regcache, ®s, regnum); |
e6031aeb | 211 | |
dfd4cc63 | 212 | if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 213 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 214 | perror_with_name (_("Couldn't write registers")); |
7e89e357 | 215 | |
283accbc | 216 | if (regnum != -1) |
7e89e357 JT |
217 | return; |
218 | } | |
e6031aeb | 219 | |
283accbc | 220 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 221 | { |
6cfb2041 | 222 | struct fpreg fpregs; |
7e89e357 JT |
223 | #ifdef HAVE_PT_GETXMMREGS |
224 | char xmmregs[512]; | |
97de3545 JB |
225 | #endif |
226 | ||
227 | #ifdef PT_GETXSTATE_INFO | |
228 | if (i386bsd_xsave_len != 0) | |
229 | { | |
230 | char *xstateregs; | |
231 | ||
232 | xstateregs = alloca (i386bsd_xsave_len); | |
233 | if (ptrace (PT_GETXSTATE, ptid_get_pid (inferior_ptid), | |
234 | (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) | |
235 | perror_with_name (_("Couldn't get extended state status")); | |
e6031aeb | 236 | |
97de3545 JB |
237 | i387_collect_xsave (regcache, -1, xstateregs, 0); |
238 | ||
239 | if (ptrace (PT_SETXSTATE, ptid_get_pid (inferior_ptid), | |
240 | (PTRACE_TYPE_ARG3) xstateregs, i386bsd_xsave_len) == -1) | |
241 | perror_with_name (_("Couldn't write extended state status")); | |
242 | return; | |
243 | } | |
244 | #endif | |
245 | ||
246 | #ifdef HAVE_PT_GETXMMREGS | |
a144416f | 247 | if (have_ptrace_xmmregs != 0 |
dfd4cc63 | 248 | && ptrace(PT_GETXMMREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 249 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
250 | { |
251 | have_ptrace_xmmregs = 1; | |
252 | ||
56be3814 | 253 | i387_collect_fxsave (regcache, regnum, xmmregs); |
e6031aeb | 254 | |
dfd4cc63 | 255 | if (ptrace (PT_SETXMMREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 256 | (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) |
e2e0b3e5 | 257 | perror_with_name (_("Couldn't write XMM registers")); |
7e89e357 JT |
258 | } |
259 | else | |
260 | { | |
261 | have_ptrace_xmmregs = 0; | |
262 | #endif | |
dfd4cc63 | 263 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 264 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 265 | perror_with_name (_("Couldn't get floating point status")); |
7e89e357 | 266 | |
56be3814 | 267 | i387_collect_fsave (regcache, regnum, &fpregs); |
f5b1afdf | 268 | |
dfd4cc63 | 269 | if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 270 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 271 | perror_with_name (_("Couldn't write floating point status")); |
7e89e357 JT |
272 | #ifdef HAVE_PT_GETXMMREGS |
273 | } | |
274 | #endif | |
e6031aeb MK |
275 | } |
276 | } | |
9692934b MK |
277 | |
278 | /* Create a prototype *BSD/i386 target. The client can override it | |
279 | with local methods. */ | |
280 | ||
281 | struct target_ops * | |
282 | i386bsd_target (void) | |
283 | { | |
284 | struct target_ops *t; | |
285 | ||
286 | t = inf_ptrace_target (); | |
287 | t->to_fetch_registers = i386bsd_fetch_inferior_registers; | |
288 | t->to_store_registers = i386bsd_store_inferior_registers; | |
289 | return t; | |
290 | } | |
e6031aeb MK |
291 | \f |
292 | ||
0afdd437 MK |
293 | /* Support for debug registers. */ |
294 | ||
295 | #ifdef HAVE_PT_GETDBREGS | |
296 | ||
297 | /* Not all versions of FreeBSD/i386 that support the debug registers | |
298 | have this macro. */ | |
299 | #ifndef DBREG_DRX | |
300 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) | |
301 | #endif | |
302 | ||
7b50312a PA |
303 | static unsigned long |
304 | i386bsd_dr_get (ptid_t ptid, int regnum) | |
305 | { | |
306 | struct dbreg dbregs; | |
307 | ||
dfd4cc63 | 308 | if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid), |
7b50312a PA |
309 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
310 | perror_with_name (_("Couldn't read debug registers")); | |
311 | ||
312 | return DBREG_DRX ((&dbregs), regnum); | |
313 | } | |
314 | ||
0afdd437 MK |
315 | static void |
316 | i386bsd_dr_set (int regnum, unsigned int value) | |
317 | { | |
318 | struct dbreg dbregs; | |
319 | ||
dfd4cc63 | 320 | if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 321 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
e2e0b3e5 | 322 | perror_with_name (_("Couldn't get debug registers")); |
0afdd437 MK |
323 | |
324 | /* For some mysterious reason, some of the reserved bits in the | |
325 | debug control register get set. Mask these off, otherwise the | |
326 | ptrace call below will fail. */ | |
afdb036a | 327 | DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00); |
0afdd437 MK |
328 | |
329 | DBREG_DRX ((&dbregs), regnum) = value; | |
330 | ||
dfd4cc63 | 331 | if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 332 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
e2e0b3e5 | 333 | perror_with_name (_("Couldn't write debug registers")); |
0afdd437 MK |
334 | } |
335 | ||
336 | void | |
337 | i386bsd_dr_set_control (unsigned long control) | |
338 | { | |
339 | i386bsd_dr_set (7, control); | |
340 | } | |
341 | ||
342 | void | |
343 | i386bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
344 | { | |
345 | gdb_assert (regnum >= 0 && regnum <= 4); | |
346 | ||
347 | i386bsd_dr_set (regnum, addr); | |
348 | } | |
349 | ||
7b50312a PA |
350 | CORE_ADDR |
351 | i386bsd_dr_get_addr (int regnum) | |
0afdd437 | 352 | { |
7b50312a | 353 | return i386bsd_dr_get (inferior_ptid, regnum); |
0afdd437 MK |
354 | } |
355 | ||
356 | unsigned long | |
357 | i386bsd_dr_get_status (void) | |
358 | { | |
7b50312a PA |
359 | return i386bsd_dr_get (inferior_ptid, 6); |
360 | } | |
0afdd437 | 361 | |
7b50312a PA |
362 | unsigned long |
363 | i386bsd_dr_get_control (void) | |
364 | { | |
365 | return i386bsd_dr_get (inferior_ptid, 7); | |
0afdd437 MK |
366 | } |
367 | ||
368 | #endif /* PT_GETDBREGS */ | |
369 | \f | |
370 | ||
15add3f5 MK |
371 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
372 | void _initialize_i386bsd_nat (void); | |
373 | ||
b7247919 MK |
374 | void |
375 | _initialize_i386bsd_nat (void) | |
376 | { | |
a3386186 | 377 | int offset; |
8201327c | 378 | |
b7247919 MK |
379 | /* To support the recognition of signal handlers, i386bsd-tdep.c |
380 | hardcodes some constants. Inclusion of this file means that we | |
381 | are compiling a native debugger, which means that we can use the | |
382 | system header files and sysctl(3) to get at the relevant | |
383 | information. */ | |
384 | ||
8201327c | 385 | #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 |
a3386186 MK |
386 | #define SC_REG_OFFSET i386fbsd4_sc_reg_offset |
387 | #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 | |
a3386186 | 388 | #define SC_REG_OFFSET i386fbsd_sc_reg_offset |
005328e3 | 389 | #elif defined (NetBSD) || defined (__NetBSD_Version__) |
a3386186 | 390 | #define SC_REG_OFFSET i386nbsd_sc_reg_offset |
005328e3 | 391 | #elif defined (OpenBSD) |
a3386186 | 392 | #define SC_REG_OFFSET i386obsd_sc_reg_offset |
8201327c MK |
393 | #endif |
394 | ||
bbe06c74 MK |
395 | #ifdef SC_REG_OFFSET |
396 | ||
a3386186 MK |
397 | /* We only check the program counter, stack pointer and frame |
398 | pointer since these members of `struct sigcontext' are essential | |
399 | for providing backtraces. More checks could be added, but would | |
400 | involve adding configure checks for the appropriate structure | |
401 | members, since older BSD's don't provide all of them. */ | |
402 | ||
403 | #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] | |
404 | #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] | |
405 | #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] | |
406 | ||
b7247919 MK |
407 | /* Override the default value for the offset of the program counter |
408 | in the sigcontext structure. */ | |
a3386186 | 409 | offset = offsetof (struct sigcontext, sc_pc); |
8201327c | 410 | |
a3386186 | 411 | if (SC_PC_OFFSET != offset) |
8201327c | 412 | { |
8a3fe4f8 | 413 | warning (_("\ |
8201327c | 414 | offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ |
8a3fe4f8 | 415 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 416 | offset, SC_PC_OFFSET); |
8201327c MK |
417 | } |
418 | ||
a3386186 | 419 | SC_PC_OFFSET = offset; |
6bff26de MK |
420 | |
421 | /* Likewise for the stack pointer. */ | |
a3386186 | 422 | offset = offsetof (struct sigcontext, sc_sp); |
6bff26de | 423 | |
a3386186 | 424 | if (SC_SP_OFFSET != offset) |
6bff26de | 425 | { |
8a3fe4f8 | 426 | warning (_("\ |
6bff26de | 427 | offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ |
8a3fe4f8 | 428 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 MK |
429 | offset, SC_SP_OFFSET); |
430 | } | |
431 | ||
432 | SC_SP_OFFSET = offset; | |
433 | ||
434 | /* And the frame pointer. */ | |
435 | offset = offsetof (struct sigcontext, sc_fp); | |
436 | ||
437 | if (SC_FP_OFFSET != offset) | |
438 | { | |
8a3fe4f8 | 439 | warning (_("\ |
a3386186 | 440 | offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ |
8a3fe4f8 | 441 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 442 | offset, SC_FP_OFFSET); |
6bff26de MK |
443 | } |
444 | ||
a3386186 | 445 | SC_FP_OFFSET = offset; |
bbe06c74 MK |
446 | |
447 | #endif /* SC_REG_OFFSET */ | |
b7247919 | 448 | } |