Commit | Line | Data |
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e6031aeb | 1 | /* Native-dependent code for modern i386 BSD's. |
3f63813d | 2 | |
ecd75fc8 | 3 | Copyright (C) 2000-2014 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 | |
e6031aeb MK |
84 | \f |
85 | ||
6cfb2041 | 86 | /* Supply the general-purpose registers in GREGS, to REGCACHE. */ |
e6031aeb | 87 | |
1fc7d519 | 88 | static void |
6cfb2041 | 89 | i386bsd_supply_gregset (struct regcache *regcache, const void *gregs) |
e6031aeb | 90 | { |
6cfb2041 | 91 | const char *regs = gregs; |
feae6502 | 92 | int regnum; |
e6031aeb | 93 | |
6cfb2041 | 94 | for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++) |
e6031aeb | 95 | { |
6cfb2041 MK |
96 | int offset = i386bsd_r_reg_offset[regnum]; |
97 | ||
98 | if (offset != -1) | |
99 | regcache_raw_supply (regcache, regnum, regs + offset); | |
e6031aeb MK |
100 | } |
101 | } | |
102 | ||
6cfb2041 MK |
103 | /* Collect register REGNUM from REGCACHE and store its contents in |
104 | GREGS. If REGNUM is -1, collect and store all appropriate | |
105 | registers. */ | |
e6031aeb | 106 | |
1fc7d519 | 107 | static void |
6cfb2041 MK |
108 | i386bsd_collect_gregset (const struct regcache *regcache, |
109 | void *gregs, int regnum) | |
e6031aeb | 110 | { |
6cfb2041 | 111 | char *regs = gregs; |
e6031aeb MK |
112 | int i; |
113 | ||
6cfb2041 MK |
114 | for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++) |
115 | { | |
116 | if (regnum == -1 || regnum == i) | |
117 | { | |
118 | int offset = i386bsd_r_reg_offset[i]; | |
e6031aeb | 119 | |
6cfb2041 MK |
120 | if (offset != -1) |
121 | regcache_raw_collect (regcache, i, regs + offset); | |
122 | } | |
123 | } | |
124 | } | |
e6031aeb | 125 | |
283accbc | 126 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
e6031aeb MK |
127 | for all registers (including the floating point registers). */ |
128 | ||
9692934b | 129 | static void |
28439f5e PA |
130 | i386bsd_fetch_inferior_registers (struct target_ops *ops, |
131 | struct regcache *regcache, int regnum) | |
e6031aeb | 132 | { |
283accbc | 133 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 134 | { |
6cfb2041 | 135 | struct reg regs; |
7e89e357 | 136 | |
dfd4cc63 | 137 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 138 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 139 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 140 | |
56be3814 | 141 | i386bsd_supply_gregset (regcache, ®s); |
283accbc | 142 | if (regnum != -1) |
7e89e357 JT |
143 | return; |
144 | } | |
e6031aeb | 145 | |
283accbc | 146 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 147 | { |
6cfb2041 | 148 | struct fpreg fpregs; |
7e89e357 JT |
149 | #ifdef HAVE_PT_GETXMMREGS |
150 | char xmmregs[512]; | |
151 | ||
a144416f | 152 | if (have_ptrace_xmmregs != 0 |
dfd4cc63 | 153 | && ptrace(PT_GETXMMREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 154 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
155 | { |
156 | have_ptrace_xmmregs = 1; | |
56be3814 | 157 | i387_supply_fxsave (regcache, -1, xmmregs); |
7e89e357 JT |
158 | } |
159 | else | |
160 | { | |
dfd4cc63 | 161 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 162 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 163 | perror_with_name (_("Couldn't get floating point status")); |
e6031aeb | 164 | |
56be3814 | 165 | i387_supply_fsave (regcache, -1, &fpregs); |
7e89e357 JT |
166 | } |
167 | #else | |
dfd4cc63 | 168 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 169 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 170 | perror_with_name (_("Couldn't get floating point status")); |
e6031aeb | 171 | |
56be3814 | 172 | i387_supply_fsave (regcache, -1, &fpregs); |
7e89e357 | 173 | #endif |
e6031aeb | 174 | } |
b051bfa4 | 175 | } |
e6031aeb | 176 | |
283accbc | 177 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
e6031aeb MK |
178 | this for all registers (including the floating point registers). */ |
179 | ||
9692934b | 180 | static void |
28439f5e PA |
181 | i386bsd_store_inferior_registers (struct target_ops *ops, |
182 | struct regcache *regcache, int regnum) | |
e6031aeb | 183 | { |
283accbc | 184 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 185 | { |
6cfb2041 | 186 | struct reg regs; |
7e89e357 | 187 | |
dfd4cc63 | 188 | if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 189 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 190 | perror_with_name (_("Couldn't get registers")); |
e6031aeb | 191 | |
56be3814 | 192 | i386bsd_collect_gregset (regcache, ®s, regnum); |
e6031aeb | 193 | |
dfd4cc63 | 194 | if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 195 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 196 | perror_with_name (_("Couldn't write registers")); |
7e89e357 | 197 | |
283accbc | 198 | if (regnum != -1) |
7e89e357 JT |
199 | return; |
200 | } | |
e6031aeb | 201 | |
283accbc | 202 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 203 | { |
6cfb2041 | 204 | struct fpreg fpregs; |
7e89e357 JT |
205 | #ifdef HAVE_PT_GETXMMREGS |
206 | char xmmregs[512]; | |
e6031aeb | 207 | |
a144416f | 208 | if (have_ptrace_xmmregs != 0 |
dfd4cc63 | 209 | && ptrace(PT_GETXMMREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 210 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
211 | { |
212 | have_ptrace_xmmregs = 1; | |
213 | ||
56be3814 | 214 | i387_collect_fxsave (regcache, regnum, xmmregs); |
e6031aeb | 215 | |
dfd4cc63 | 216 | if (ptrace (PT_SETXMMREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 217 | (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) |
e2e0b3e5 | 218 | perror_with_name (_("Couldn't write XMM registers")); |
7e89e357 JT |
219 | } |
220 | else | |
221 | { | |
222 | have_ptrace_xmmregs = 0; | |
223 | #endif | |
dfd4cc63 | 224 | if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 225 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 226 | perror_with_name (_("Couldn't get floating point status")); |
7e89e357 | 227 | |
56be3814 | 228 | i387_collect_fsave (regcache, regnum, &fpregs); |
f5b1afdf | 229 | |
dfd4cc63 | 230 | if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 231 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 232 | perror_with_name (_("Couldn't write floating point status")); |
7e89e357 JT |
233 | #ifdef HAVE_PT_GETXMMREGS |
234 | } | |
235 | #endif | |
e6031aeb MK |
236 | } |
237 | } | |
9692934b MK |
238 | |
239 | /* Create a prototype *BSD/i386 target. The client can override it | |
240 | with local methods. */ | |
241 | ||
242 | struct target_ops * | |
243 | i386bsd_target (void) | |
244 | { | |
245 | struct target_ops *t; | |
246 | ||
247 | t = inf_ptrace_target (); | |
248 | t->to_fetch_registers = i386bsd_fetch_inferior_registers; | |
249 | t->to_store_registers = i386bsd_store_inferior_registers; | |
250 | return t; | |
251 | } | |
e6031aeb MK |
252 | \f |
253 | ||
0afdd437 MK |
254 | /* Support for debug registers. */ |
255 | ||
256 | #ifdef HAVE_PT_GETDBREGS | |
257 | ||
258 | /* Not all versions of FreeBSD/i386 that support the debug registers | |
259 | have this macro. */ | |
260 | #ifndef DBREG_DRX | |
261 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) | |
262 | #endif | |
263 | ||
7b50312a PA |
264 | static unsigned long |
265 | i386bsd_dr_get (ptid_t ptid, int regnum) | |
266 | { | |
267 | struct dbreg dbregs; | |
268 | ||
dfd4cc63 | 269 | if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid), |
7b50312a PA |
270 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
271 | perror_with_name (_("Couldn't read debug registers")); | |
272 | ||
273 | return DBREG_DRX ((&dbregs), regnum); | |
274 | } | |
275 | ||
0afdd437 MK |
276 | static void |
277 | i386bsd_dr_set (int regnum, unsigned int value) | |
278 | { | |
279 | struct dbreg dbregs; | |
280 | ||
dfd4cc63 | 281 | if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 282 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
e2e0b3e5 | 283 | perror_with_name (_("Couldn't get debug registers")); |
0afdd437 MK |
284 | |
285 | /* For some mysterious reason, some of the reserved bits in the | |
286 | debug control register get set. Mask these off, otherwise the | |
287 | ptrace call below will fail. */ | |
afdb036a | 288 | DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00); |
0afdd437 MK |
289 | |
290 | DBREG_DRX ((&dbregs), regnum) = value; | |
291 | ||
dfd4cc63 | 292 | if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid), |
9f8e0089 | 293 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
e2e0b3e5 | 294 | perror_with_name (_("Couldn't write debug registers")); |
0afdd437 MK |
295 | } |
296 | ||
297 | void | |
298 | i386bsd_dr_set_control (unsigned long control) | |
299 | { | |
300 | i386bsd_dr_set (7, control); | |
301 | } | |
302 | ||
303 | void | |
304 | i386bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
305 | { | |
306 | gdb_assert (regnum >= 0 && regnum <= 4); | |
307 | ||
308 | i386bsd_dr_set (regnum, addr); | |
309 | } | |
310 | ||
7b50312a PA |
311 | CORE_ADDR |
312 | i386bsd_dr_get_addr (int regnum) | |
0afdd437 | 313 | { |
7b50312a | 314 | return i386bsd_dr_get (inferior_ptid, regnum); |
0afdd437 MK |
315 | } |
316 | ||
317 | unsigned long | |
318 | i386bsd_dr_get_status (void) | |
319 | { | |
7b50312a PA |
320 | return i386bsd_dr_get (inferior_ptid, 6); |
321 | } | |
0afdd437 | 322 | |
7b50312a PA |
323 | unsigned long |
324 | i386bsd_dr_get_control (void) | |
325 | { | |
326 | return i386bsd_dr_get (inferior_ptid, 7); | |
0afdd437 MK |
327 | } |
328 | ||
329 | #endif /* PT_GETDBREGS */ | |
330 | \f | |
331 | ||
15add3f5 MK |
332 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
333 | void _initialize_i386bsd_nat (void); | |
334 | ||
b7247919 MK |
335 | void |
336 | _initialize_i386bsd_nat (void) | |
337 | { | |
a3386186 | 338 | int offset; |
8201327c | 339 | |
b7247919 MK |
340 | /* To support the recognition of signal handlers, i386bsd-tdep.c |
341 | hardcodes some constants. Inclusion of this file means that we | |
342 | are compiling a native debugger, which means that we can use the | |
343 | system header files and sysctl(3) to get at the relevant | |
344 | information. */ | |
345 | ||
8201327c | 346 | #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 |
a3386186 MK |
347 | #define SC_REG_OFFSET i386fbsd4_sc_reg_offset |
348 | #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 | |
a3386186 | 349 | #define SC_REG_OFFSET i386fbsd_sc_reg_offset |
005328e3 | 350 | #elif defined (NetBSD) || defined (__NetBSD_Version__) |
a3386186 | 351 | #define SC_REG_OFFSET i386nbsd_sc_reg_offset |
005328e3 | 352 | #elif defined (OpenBSD) |
a3386186 | 353 | #define SC_REG_OFFSET i386obsd_sc_reg_offset |
8201327c MK |
354 | #endif |
355 | ||
bbe06c74 MK |
356 | #ifdef SC_REG_OFFSET |
357 | ||
a3386186 MK |
358 | /* We only check the program counter, stack pointer and frame |
359 | pointer since these members of `struct sigcontext' are essential | |
360 | for providing backtraces. More checks could be added, but would | |
361 | involve adding configure checks for the appropriate structure | |
362 | members, since older BSD's don't provide all of them. */ | |
363 | ||
364 | #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] | |
365 | #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] | |
366 | #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] | |
367 | ||
b7247919 MK |
368 | /* Override the default value for the offset of the program counter |
369 | in the sigcontext structure. */ | |
a3386186 | 370 | offset = offsetof (struct sigcontext, sc_pc); |
8201327c | 371 | |
a3386186 | 372 | if (SC_PC_OFFSET != offset) |
8201327c | 373 | { |
8a3fe4f8 | 374 | warning (_("\ |
8201327c | 375 | offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ |
8a3fe4f8 | 376 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 377 | offset, SC_PC_OFFSET); |
8201327c MK |
378 | } |
379 | ||
a3386186 | 380 | SC_PC_OFFSET = offset; |
6bff26de MK |
381 | |
382 | /* Likewise for the stack pointer. */ | |
a3386186 | 383 | offset = offsetof (struct sigcontext, sc_sp); |
6bff26de | 384 | |
a3386186 | 385 | if (SC_SP_OFFSET != offset) |
6bff26de | 386 | { |
8a3fe4f8 | 387 | warning (_("\ |
6bff26de | 388 | offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ |
8a3fe4f8 | 389 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 MK |
390 | offset, SC_SP_OFFSET); |
391 | } | |
392 | ||
393 | SC_SP_OFFSET = offset; | |
394 | ||
395 | /* And the frame pointer. */ | |
396 | offset = offsetof (struct sigcontext, sc_fp); | |
397 | ||
398 | if (SC_FP_OFFSET != offset) | |
399 | { | |
8a3fe4f8 | 400 | warning (_("\ |
a3386186 | 401 | offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ |
8a3fe4f8 | 402 | Please report this to <bug-gdb@gnu.org>."), |
a3386186 | 403 | offset, SC_FP_OFFSET); |
6bff26de MK |
404 | } |
405 | ||
a3386186 | 406 | SC_FP_OFFSET = offset; |
bbe06c74 MK |
407 | |
408 | #endif /* SC_REG_OFFSET */ | |
b7247919 | 409 | } |