C++: dlsym casts in gdb/linux-thread-db.c and gdb/gdbserver/thread-db.c
[deliverable/binutils-gdb.git] / gdb / i386bsd-nat.c
1 /* Native-dependent code for modern i386 BSD's.
2
3 Copyright (C) 2000-2015 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
19
20 #include "defs.h"
21 #include "inferior.h"
22 #include "regcache.h"
23
24 #include <signal.h>
25 #include <sys/types.h>
26 #include <sys/ptrace.h>
27 #include <machine/reg.h>
28 #include <machine/frame.h>
29
30 #include "i386-tdep.h"
31 #include "i387-tdep.h"
32 #include "i386bsd-nat.h"
33 #include "inf-ptrace.h"
34 \f
35
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
41 /* Offset in `struct reg' where MEMBER is stored. */
42 #define REG_OFFSET(member) offsetof (struct reg, member)
43
44 /* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
45 reg' where the GDB register REGNUM is stored. Unsupported
46 registers are marked with `-1'. */
47 static int i386bsd_r_reg_offset[] =
48 {
49 REG_OFFSET (r_eax),
50 REG_OFFSET (r_ecx),
51 REG_OFFSET (r_edx),
52 REG_OFFSET (r_ebx),
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),
63 #ifdef HAVE_STRUCT_REG_R_FS
64 REG_OFFSET (r_fs),
65 #else
66 -1,
67 #endif
68 #ifdef HAVE_STRUCT_REG_R_GS
69 REG_OFFSET (r_gs)
70 #else
71 -1
72 #endif
73 };
74
75 /* Macro to determine if a register is fetched with PT_GETREGS. */
76 #define GETREGS_SUPPLIES(regnum) \
77 ((0 <= (regnum) && (regnum) <= 15))
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
84
85 #ifdef PT_GETXSTATE_INFO
86 size_t i386bsd_xsave_len;
87 #endif
88 \f
89
90 /* Supply the general-purpose registers in GREGS, to REGCACHE. */
91
92 static void
93 i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
94 {
95 const char *regs = gregs;
96 int regnum;
97
98 for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
99 {
100 int offset = i386bsd_r_reg_offset[regnum];
101
102 if (offset != -1)
103 regcache_raw_supply (regcache, regnum, regs + offset);
104 }
105 }
106
107 /* Collect register REGNUM from REGCACHE and store its contents in
108 GREGS. If REGNUM is -1, collect and store all appropriate
109 registers. */
110
111 static void
112 i386bsd_collect_gregset (const struct regcache *regcache,
113 void *gregs, int regnum)
114 {
115 char *regs = gregs;
116 int i;
117
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];
123
124 if (offset != -1)
125 regcache_raw_collect (regcache, i, regs + offset);
126 }
127 }
128 }
129
130 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
131 for all registers (including the floating point registers). */
132
133 static void
134 i386bsd_fetch_inferior_registers (struct target_ops *ops,
135 struct regcache *regcache, int regnum)
136 {
137 if (regnum == -1 || GETREGS_SUPPLIES (regnum))
138 {
139 struct reg regs;
140
141 if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
142 (PTRACE_TYPE_ARG3) &regs, 0) == -1)
143 perror_with_name (_("Couldn't get registers"));
144
145 i386bsd_supply_gregset (regcache, &regs);
146 if (regnum != -1)
147 return;
148 }
149
150 if (regnum == -1 || regnum >= I386_ST0_REGNUM)
151 {
152 struct fpreg fpregs;
153 #ifdef HAVE_PT_GETXMMREGS
154 char xmmregs[512];
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"));
166
167 i387_supply_xsave (regcache, -1, xstateregs);
168 return;
169 }
170 #endif
171
172 #ifdef HAVE_PT_GETXMMREGS
173 if (have_ptrace_xmmregs != 0
174 && ptrace(PT_GETXMMREGS, ptid_get_pid (inferior_ptid),
175 (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
176 {
177 have_ptrace_xmmregs = 1;
178 i387_supply_fxsave (regcache, -1, xmmregs);
179 }
180 else
181 {
182 have_ptrace_xmmregs = 0;
183 #endif
184 if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
185 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
186 perror_with_name (_("Couldn't get floating point status"));
187
188 i387_supply_fsave (regcache, -1, &fpregs);
189 #ifdef HAVE_PT_GETXMMREGS
190 }
191 #endif
192 }
193 }
194
195 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
196 this for all registers (including the floating point registers). */
197
198 static void
199 i386bsd_store_inferior_registers (struct target_ops *ops,
200 struct regcache *regcache, int regnum)
201 {
202 if (regnum == -1 || GETREGS_SUPPLIES (regnum))
203 {
204 struct reg regs;
205
206 if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
207 (PTRACE_TYPE_ARG3) &regs, 0) == -1)
208 perror_with_name (_("Couldn't get registers"));
209
210 i386bsd_collect_gregset (regcache, &regs, regnum);
211
212 if (ptrace (PT_SETREGS, ptid_get_pid (inferior_ptid),
213 (PTRACE_TYPE_ARG3) &regs, 0) == -1)
214 perror_with_name (_("Couldn't write registers"));
215
216 if (regnum != -1)
217 return;
218 }
219
220 if (regnum == -1 || regnum >= I386_ST0_REGNUM)
221 {
222 struct fpreg fpregs;
223 #ifdef HAVE_PT_GETXMMREGS
224 char xmmregs[512];
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"));
236
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
247 if (have_ptrace_xmmregs != 0
248 && ptrace(PT_GETXMMREGS, ptid_get_pid (inferior_ptid),
249 (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
250 {
251 have_ptrace_xmmregs = 1;
252
253 i387_collect_fxsave (regcache, regnum, xmmregs);
254
255 if (ptrace (PT_SETXMMREGS, ptid_get_pid (inferior_ptid),
256 (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
257 perror_with_name (_("Couldn't write XMM registers"));
258 }
259 else
260 {
261 have_ptrace_xmmregs = 0;
262 #endif
263 if (ptrace (PT_GETFPREGS, ptid_get_pid (inferior_ptid),
264 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
265 perror_with_name (_("Couldn't get floating point status"));
266
267 i387_collect_fsave (regcache, regnum, &fpregs);
268
269 if (ptrace (PT_SETFPREGS, ptid_get_pid (inferior_ptid),
270 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
271 perror_with_name (_("Couldn't write floating point status"));
272 #ifdef HAVE_PT_GETXMMREGS
273 }
274 #endif
275 }
276 }
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 }
291 \f
292
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
303 static unsigned long
304 i386bsd_dr_get (ptid_t ptid, int regnum)
305 {
306 struct dbreg dbregs;
307
308 if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
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
315 static void
316 i386bsd_dr_set (int regnum, unsigned int value)
317 {
318 struct dbreg dbregs;
319
320 if (ptrace (PT_GETDBREGS, ptid_get_pid (inferior_ptid),
321 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
322 perror_with_name (_("Couldn't get debug registers"));
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. */
327 DBREG_DRX ((&dbregs), 7) &= ~(0x0000fc00);
328
329 DBREG_DRX ((&dbregs), regnum) = value;
330
331 if (ptrace (PT_SETDBREGS, ptid_get_pid (inferior_ptid),
332 (PTRACE_TYPE_ARG3) &dbregs, 0) == -1)
333 perror_with_name (_("Couldn't write debug registers"));
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
350 CORE_ADDR
351 i386bsd_dr_get_addr (int regnum)
352 {
353 return i386bsd_dr_get (inferior_ptid, regnum);
354 }
355
356 unsigned long
357 i386bsd_dr_get_status (void)
358 {
359 return i386bsd_dr_get (inferior_ptid, 6);
360 }
361
362 unsigned long
363 i386bsd_dr_get_control (void)
364 {
365 return i386bsd_dr_get (inferior_ptid, 7);
366 }
367
368 #endif /* PT_GETDBREGS */
369 \f
370
371 /* Provide a prototype to silence -Wmissing-prototypes. */
372 void _initialize_i386bsd_nat (void);
373
374 void
375 _initialize_i386bsd_nat (void)
376 {
377 int offset;
378
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
385 #if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
386 #define SC_REG_OFFSET i386fbsd4_sc_reg_offset
387 #elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
388 #define SC_REG_OFFSET i386fbsd_sc_reg_offset
389 #elif defined (NetBSD) || defined (__NetBSD_Version__)
390 #define SC_REG_OFFSET i386nbsd_sc_reg_offset
391 #elif defined (OpenBSD)
392 #define SC_REG_OFFSET i386obsd_sc_reg_offset
393 #endif
394
395 #ifdef SC_REG_OFFSET
396
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
407 /* Override the default value for the offset of the program counter
408 in the sigcontext structure. */
409 offset = offsetof (struct sigcontext, sc_pc);
410
411 if (SC_PC_OFFSET != offset)
412 {
413 warning (_("\
414 offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
415 Please report this to <bug-gdb@gnu.org>."),
416 offset, SC_PC_OFFSET);
417 }
418
419 SC_PC_OFFSET = offset;
420
421 /* Likewise for the stack pointer. */
422 offset = offsetof (struct sigcontext, sc_sp);
423
424 if (SC_SP_OFFSET != offset)
425 {
426 warning (_("\
427 offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
428 Please report this to <bug-gdb@gnu.org>."),
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 {
439 warning (_("\
440 offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
441 Please report this to <bug-gdb@gnu.org>."),
442 offset, SC_FP_OFFSET);
443 }
444
445 SC_FP_OFFSET = offset;
446
447 #endif /* SC_REG_OFFSET */
448 }
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