Commit | Line | Data |
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e6031aeb | 1 | /* Native-dependent code for modern i386 BSD's. |
3f63813d MK |
2 | |
3 | Copyright 2000, 2001, 2002, 2003, 2004 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
4e052eda | 24 | #include "regcache.h" |
e6031aeb | 25 | |
0afdd437 | 26 | #include "gdb_assert.h" |
b7247919 MK |
27 | #include <signal.h> |
28 | #include <stddef.h> | |
e6031aeb MK |
29 | #include <sys/types.h> |
30 | #include <sys/ptrace.h> | |
31 | #include <machine/reg.h> | |
32 | #include <machine/frame.h> | |
33 | ||
57976e88 | 34 | #include "i386-tdep.h" |
1fc7d519 | 35 | #include "i387-tdep.h" |
9692934b MK |
36 | #include "i386bsd-nat.h" |
37 | #include "inf-ptrace.h" | |
b051bfa4 MK |
38 | \f |
39 | ||
e6031aeb MK |
40 | /* In older BSD versions we cannot get at some of the segment |
41 | registers. FreeBSD for example didn't support the %fs and %gs | |
42 | registers until the 3.0 release. We have autoconf checks for their | |
43 | presence, and deal gracefully with their absence. */ | |
44 | ||
6cfb2041 MK |
45 | /* Offset in `struct reg' where MEMBER is stored. */ |
46 | #define REG_OFFSET(member) offsetof (struct reg, member) | |
e6031aeb | 47 | |
6cfb2041 MK |
48 | /* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct |
49 | reg' where the GDB register REGNUM is stored. Unsupported | |
e6031aeb | 50 | registers are marked with `-1'. */ |
6cfb2041 | 51 | static int i386bsd_r_reg_offset[] = |
e6031aeb MK |
52 | { |
53 | REG_OFFSET (r_eax), | |
54 | REG_OFFSET (r_ecx), | |
55 | REG_OFFSET (r_edx), | |
2c48bda3 | 56 | REG_OFFSET (r_ebx), |
e6031aeb MK |
57 | REG_OFFSET (r_esp), |
58 | REG_OFFSET (r_ebp), | |
59 | REG_OFFSET (r_esi), | |
60 | REG_OFFSET (r_edi), | |
61 | REG_OFFSET (r_eip), | |
62 | REG_OFFSET (r_eflags), | |
63 | REG_OFFSET (r_cs), | |
64 | REG_OFFSET (r_ss), | |
65 | REG_OFFSET (r_ds), | |
66 | REG_OFFSET (r_es), | |
422ea4b8 | 67 | #ifdef HAVE_STRUCT_REG_R_FS |
e6031aeb MK |
68 | REG_OFFSET (r_fs), |
69 | #else | |
70 | -1, | |
71 | #endif | |
422ea4b8 | 72 | #ifdef HAVE_STRUCT_REG_R_GS |
e6031aeb MK |
73 | REG_OFFSET (r_gs) |
74 | #else | |
75 | -1 | |
76 | #endif | |
77 | }; | |
78 | ||
7e89e357 | 79 | /* Macro to determine if a register is fetched with PT_GETREGS. */ |
283accbc MK |
80 | #define GETREGS_SUPPLIES(regnum) \ |
81 | ((0 <= (regnum) && (regnum) <= 15)) | |
7e89e357 JT |
82 | |
83 | #ifdef HAVE_PT_GETXMMREGS | |
84 | /* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1 | |
85 | so that we try PT_GETXMMREGS the first time around. */ | |
86 | static int have_ptrace_xmmregs = -1; | |
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 MK |
133 | static void |
134 | i386bsd_fetch_inferior_registers (int regnum) | |
e6031aeb | 135 | { |
283accbc | 136 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 137 | { |
6cfb2041 | 138 | struct reg regs; |
7e89e357 JT |
139 | |
140 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 141 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
7e89e357 | 142 | perror_with_name ("Couldn't get registers"); |
e6031aeb | 143 | |
6cfb2041 | 144 | i386bsd_supply_gregset (current_regcache, ®s); |
283accbc | 145 | if (regnum != -1) |
7e89e357 JT |
146 | return; |
147 | } | |
e6031aeb | 148 | |
283accbc | 149 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 150 | { |
6cfb2041 | 151 | struct fpreg fpregs; |
7e89e357 JT |
152 | #ifdef HAVE_PT_GETXMMREGS |
153 | char xmmregs[512]; | |
154 | ||
a144416f MK |
155 | if (have_ptrace_xmmregs != 0 |
156 | && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 157 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
158 | { |
159 | have_ptrace_xmmregs = 1; | |
41d041d6 | 160 | i387_supply_fxsave (current_regcache, -1, xmmregs); |
7e89e357 JT |
161 | } |
162 | else | |
163 | { | |
164 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 165 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
7e89e357 | 166 | perror_with_name ("Couldn't get floating point status"); |
e6031aeb | 167 | |
41d041d6 | 168 | i387_supply_fsave (current_regcache, -1, &fpregs); |
7e89e357 JT |
169 | } |
170 | #else | |
39f77062 | 171 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), |
9f8e0089 | 172 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e6031aeb MK |
173 | perror_with_name ("Couldn't get floating point status"); |
174 | ||
41d041d6 | 175 | i387_supply_fsave (current_regcache, -1, &fpregs); |
7e89e357 | 176 | #endif |
e6031aeb | 177 | } |
b051bfa4 | 178 | } |
e6031aeb | 179 | |
283accbc | 180 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
e6031aeb MK |
181 | this for all registers (including the floating point registers). */ |
182 | ||
9692934b MK |
183 | static void |
184 | i386bsd_store_inferior_registers (int regnum) | |
e6031aeb | 185 | { |
283accbc | 186 | if (regnum == -1 || GETREGS_SUPPLIES (regnum)) |
7e89e357 | 187 | { |
6cfb2041 | 188 | struct reg regs; |
7e89e357 JT |
189 | |
190 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 191 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
7e89e357 | 192 | perror_with_name ("Couldn't get registers"); |
e6031aeb | 193 | |
6cfb2041 | 194 | i386bsd_collect_gregset (current_regcache, ®s, regnum); |
e6031aeb | 195 | |
7e89e357 | 196 | if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), |
9f8e0089 | 197 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
7e89e357 JT |
198 | perror_with_name ("Couldn't write registers"); |
199 | ||
283accbc | 200 | if (regnum != -1) |
7e89e357 JT |
201 | return; |
202 | } | |
e6031aeb | 203 | |
283accbc | 204 | if (regnum == -1 || regnum >= I386_ST0_REGNUM) |
e6031aeb | 205 | { |
6cfb2041 | 206 | struct fpreg fpregs; |
7e89e357 JT |
207 | #ifdef HAVE_PT_GETXMMREGS |
208 | char xmmregs[512]; | |
e6031aeb | 209 | |
a144416f MK |
210 | if (have_ptrace_xmmregs != 0 |
211 | && ptrace(PT_GETXMMREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 212 | (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) |
7e89e357 JT |
213 | { |
214 | have_ptrace_xmmregs = 1; | |
215 | ||
283accbc | 216 | i387_collect_fxsave (current_regcache, regnum, xmmregs); |
e6031aeb | 217 | |
7e89e357 | 218 | if (ptrace (PT_SETXMMREGS, PIDGET (inferior_ptid), |
9f8e0089 | 219 | (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) |
7e89e357 JT |
220 | perror_with_name ("Couldn't write XMM registers"); |
221 | } | |
222 | else | |
223 | { | |
224 | have_ptrace_xmmregs = 0; | |
225 | #endif | |
226 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 227 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
7e89e357 JT |
228 | perror_with_name ("Couldn't get floating point status"); |
229 | ||
283accbc | 230 | i387_collect_fsave (current_regcache, regnum, &fpregs); |
f5b1afdf | 231 | |
7e89e357 | 232 | if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), |
9f8e0089 | 233 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
7e89e357 JT |
234 | perror_with_name ("Couldn't write floating point status"); |
235 | #ifdef HAVE_PT_GETXMMREGS | |
236 | } | |
237 | #endif | |
e6031aeb MK |
238 | } |
239 | } | |
9692934b MK |
240 | |
241 | /* Create a prototype *BSD/i386 target. The client can override it | |
242 | with local methods. */ | |
243 | ||
244 | struct target_ops * | |
245 | i386bsd_target (void) | |
246 | { | |
247 | struct target_ops *t; | |
248 | ||
249 | t = inf_ptrace_target (); | |
250 | t->to_fetch_registers = i386bsd_fetch_inferior_registers; | |
251 | t->to_store_registers = i386bsd_store_inferior_registers; | |
252 | return t; | |
253 | } | |
e6031aeb MK |
254 | \f |
255 | ||
0afdd437 MK |
256 | /* Support for debug registers. */ |
257 | ||
258 | #ifdef HAVE_PT_GETDBREGS | |
259 | ||
260 | /* Not all versions of FreeBSD/i386 that support the debug registers | |
261 | have this macro. */ | |
262 | #ifndef DBREG_DRX | |
263 | #define DBREG_DRX(d, x) ((&d->dr0)[x]) | |
264 | #endif | |
265 | ||
266 | static void | |
267 | i386bsd_dr_set (int regnum, unsigned int value) | |
268 | { | |
269 | struct dbreg dbregs; | |
270 | ||
39f77062 | 271 | if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), |
9f8e0089 | 272 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
0afdd437 MK |
273 | perror_with_name ("Couldn't get debug registers"); |
274 | ||
275 | /* For some mysterious reason, some of the reserved bits in the | |
276 | debug control register get set. Mask these off, otherwise the | |
277 | ptrace call below will fail. */ | |
afdb036a | 278 | DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00); |
0afdd437 MK |
279 | |
280 | DBREG_DRX ((&dbregs), regnum) = value; | |
281 | ||
39f77062 | 282 | if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid), |
9f8e0089 | 283 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
0afdd437 MK |
284 | perror_with_name ("Couldn't write debug registers"); |
285 | } | |
286 | ||
287 | void | |
288 | i386bsd_dr_set_control (unsigned long control) | |
289 | { | |
290 | i386bsd_dr_set (7, control); | |
291 | } | |
292 | ||
293 | void | |
294 | i386bsd_dr_set_addr (int regnum, CORE_ADDR addr) | |
295 | { | |
296 | gdb_assert (regnum >= 0 && regnum <= 4); | |
297 | ||
298 | i386bsd_dr_set (regnum, addr); | |
299 | } | |
300 | ||
301 | void | |
302 | i386bsd_dr_reset_addr (int regnum) | |
303 | { | |
304 | gdb_assert (regnum >= 0 && regnum <= 4); | |
305 | ||
306 | i386bsd_dr_set (regnum, 0); | |
307 | } | |
308 | ||
309 | unsigned long | |
310 | i386bsd_dr_get_status (void) | |
311 | { | |
312 | struct dbreg dbregs; | |
313 | ||
314 | /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the | |
315 | ptrace call fails breaks debugging remote targets. The correct | |
316 | way to fix this is to add the hardware breakpoint and watchpoint | |
b7247919 | 317 | stuff to the target vector. For now, just return zero if the |
0afdd437 | 318 | ptrace call fails. */ |
39f77062 | 319 | if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid), |
9f8e0089 | 320 | (PTRACE_TYPE_ARG3) &dbregs, 0) == -1) |
0afdd437 MK |
321 | #if 0 |
322 | perror_with_name ("Couldn't read debug registers"); | |
323 | #else | |
324 | return 0; | |
325 | #endif | |
326 | ||
afdb036a | 327 | return DBREG_DRX ((&dbregs), 6); |
0afdd437 MK |
328 | } |
329 | ||
330 | #endif /* PT_GETDBREGS */ | |
331 | \f | |
332 | ||
e6031aeb MK |
333 | /* Support for the user struct. */ |
334 | ||
283accbc | 335 | /* Return the address register REGNUM. BLOCKEND is the value of |
e6031aeb MK |
336 | u.u_ar0, which should point to the registers. */ |
337 | ||
338 | CORE_ADDR | |
283accbc | 339 | register_u_addr (CORE_ADDR blockend, int regnum) |
e6031aeb | 340 | { |
6cfb2041 MK |
341 | gdb_assert (regnum >= 0 && regnum < ARRAY_SIZE (i386bsd_r_reg_offset)); |
342 | ||
343 | return blockend + i386bsd_r_reg_offset[regnum]; | |
e6031aeb MK |
344 | } |
345 | ||
346 | #include <sys/param.h> | |
347 | #include <sys/user.h> | |
348 | ||
349 | /* Return the size of the user struct. */ | |
350 | ||
351 | int | |
352 | kernel_u_size (void) | |
353 | { | |
354 | return (sizeof (struct user)); | |
355 | } | |
b7247919 | 356 | \f |
b7247919 MK |
357 | void |
358 | _initialize_i386bsd_nat (void) | |
359 | { | |
a3386186 | 360 | int offset; |
8201327c | 361 | |
b7247919 MK |
362 | /* To support the recognition of signal handlers, i386bsd-tdep.c |
363 | hardcodes some constants. Inclusion of this file means that we | |
364 | are compiling a native debugger, which means that we can use the | |
365 | system header files and sysctl(3) to get at the relevant | |
366 | information. */ | |
367 | ||
8201327c | 368 | #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 |
a3386186 MK |
369 | #define SC_REG_OFFSET i386fbsd4_sc_reg_offset |
370 | #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 | |
a3386186 | 371 | #define SC_REG_OFFSET i386fbsd_sc_reg_offset |
005328e3 | 372 | #elif defined (NetBSD) || defined (__NetBSD_Version__) |
a3386186 | 373 | #define SC_REG_OFFSET i386nbsd_sc_reg_offset |
005328e3 | 374 | #elif defined (OpenBSD) |
a3386186 | 375 | #define SC_REG_OFFSET i386obsd_sc_reg_offset |
8201327c MK |
376 | #endif |
377 | ||
bbe06c74 MK |
378 | #ifdef SC_REG_OFFSET |
379 | ||
a3386186 MK |
380 | /* We only check the program counter, stack pointer and frame |
381 | pointer since these members of `struct sigcontext' are essential | |
382 | for providing backtraces. More checks could be added, but would | |
383 | involve adding configure checks for the appropriate structure | |
384 | members, since older BSD's don't provide all of them. */ | |
385 | ||
386 | #define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] | |
387 | #define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] | |
388 | #define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] | |
389 | ||
b7247919 MK |
390 | /* Override the default value for the offset of the program counter |
391 | in the sigcontext structure. */ | |
a3386186 | 392 | offset = offsetof (struct sigcontext, sc_pc); |
8201327c | 393 | |
a3386186 | 394 | if (SC_PC_OFFSET != offset) |
8201327c MK |
395 | { |
396 | warning ("\ | |
397 | offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ | |
a3386186 MK |
398 | Please report this to <bug-gdb@gnu.org>.", |
399 | offset, SC_PC_OFFSET); | |
8201327c MK |
400 | } |
401 | ||
a3386186 | 402 | SC_PC_OFFSET = offset; |
6bff26de MK |
403 | |
404 | /* Likewise for the stack pointer. */ | |
a3386186 | 405 | offset = offsetof (struct sigcontext, sc_sp); |
6bff26de | 406 | |
a3386186 | 407 | if (SC_SP_OFFSET != offset) |
6bff26de MK |
408 | { |
409 | warning ("\ | |
410 | offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ | |
411 | Please report this to <bug-gdb@gnu.org>.", | |
a3386186 MK |
412 | offset, SC_SP_OFFSET); |
413 | } | |
414 | ||
415 | SC_SP_OFFSET = offset; | |
416 | ||
417 | /* And the frame pointer. */ | |
418 | offset = offsetof (struct sigcontext, sc_fp); | |
419 | ||
420 | if (SC_FP_OFFSET != offset) | |
421 | { | |
422 | warning ("\ | |
423 | offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ | |
424 | Please report this to <bug-gdb@gnu.org>.", | |
425 | offset, SC_FP_OFFSET); | |
6bff26de MK |
426 | } |
427 | ||
a3386186 | 428 | SC_FP_OFFSET = offset; |
bbe06c74 MK |
429 | |
430 | #endif /* SC_REG_OFFSET */ | |
b7247919 | 431 | } |