Commit | Line | Data |
---|---|---|
a4194092 | 1 | /* Native-dependent code for GNU/Linux i386. |
a4b6fc86 | 2 | |
6aba47ca | 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
31828840 | 4 | Free Software Foundation, Inc. |
d4f3574e | 5 | |
04cd15b6 | 6 | This file is part of GDB. |
d4f3574e | 7 | |
04cd15b6 MK |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
d4f3574e | 12 | |
04cd15b6 MK |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
d4f3574e | 17 | |
04cd15b6 MK |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
d4f3574e SS |
22 | |
23 | #include "defs.h" | |
24 | #include "inferior.h" | |
25 | #include "gdbcore.h" | |
4e052eda | 26 | #include "regcache.h" |
10d6c8cd | 27 | #include "target.h" |
4de4c07c | 28 | #include "linux-nat.h" |
d4f3574e | 29 | |
84346e11 | 30 | #include "gdb_assert.h" |
309367d4 | 31 | #include "gdb_string.h" |
d4f3574e SS |
32 | #include <sys/ptrace.h> |
33 | #include <sys/user.h> | |
34 | #include <sys/procfs.h> | |
35 | ||
36 | #ifdef HAVE_SYS_REG_H | |
37 | #include <sys/reg.h> | |
38 | #endif | |
39 | ||
ce556f85 MK |
40 | #ifndef ORIG_EAX |
41 | #define ORIG_EAX -1 | |
42 | #endif | |
43 | ||
84346e11 MK |
44 | #ifdef HAVE_SYS_DEBUGREG_H |
45 | #include <sys/debugreg.h> | |
46 | #endif | |
47 | ||
48 | #ifndef DR_FIRSTADDR | |
49 | #define DR_FIRSTADDR 0 | |
50 | #endif | |
51 | ||
52 | #ifndef DR_LASTADDR | |
53 | #define DR_LASTADDR 3 | |
54 | #endif | |
55 | ||
56 | #ifndef DR_STATUS | |
57 | #define DR_STATUS 6 | |
58 | #endif | |
59 | ||
60 | #ifndef DR_CONTROL | |
61 | #define DR_CONTROL 7 | |
62 | #endif | |
63 | ||
6ce2ac0b | 64 | /* Prototypes for supply_gregset etc. */ |
c60c0f5f MS |
65 | #include "gregset.h" |
66 | ||
e750d25e | 67 | #include "i387-tdep.h" |
c3833324 | 68 | #include "i386-tdep.h" |
5179e78f AC |
69 | #include "i386-linux-tdep.h" |
70 | ||
b757528f JJ |
71 | /* Defines ps_err_e, struct ps_prochandle. */ |
72 | #include "gdb_proc_service.h" | |
6ce2ac0b | 73 | \f |
d4f3574e | 74 | |
a4b6fc86 AC |
75 | /* The register sets used in GNU/Linux ELF core-dumps are identical to |
76 | the register sets in `struct user' that is used for a.out | |
77 | core-dumps, and is also used by `ptrace'. The corresponding types | |
78 | are `elf_gregset_t' for the general-purpose registers (with | |
04cd15b6 MK |
79 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' |
80 | for the floating-point registers. | |
81 | ||
82 | Those types used to be available under the names `gregset_t' and | |
83 | `fpregset_t' too, and this file used those names in the past. But | |
84 | those names are now used for the register sets used in the | |
85 | `mcontext_t' type, and have a different size and layout. */ | |
86 | ||
87 | /* Mapping between the general-purpose registers in `struct user' | |
88 | format and GDB's register array layout. */ | |
d4f3574e SS |
89 | static int regmap[] = |
90 | { | |
91 | EAX, ECX, EDX, EBX, | |
92 | UESP, EBP, ESI, EDI, | |
93 | EIP, EFL, CS, SS, | |
ce556f85 MK |
94 | DS, ES, FS, GS, |
95 | -1, -1, -1, -1, /* st0, st1, st2, st3 */ | |
96 | -1, -1, -1, -1, /* st4, st5, st6, st7 */ | |
97 | -1, -1, -1, -1, /* fctrl, fstat, ftag, fiseg */ | |
98 | -1, -1, -1, -1, /* fioff, foseg, fooff, fop */ | |
99 | -1, -1, -1, -1, /* xmm0, xmm1, xmm2, xmm3 */ | |
100 | -1, -1, -1, -1, /* xmm4, xmm5, xmm6, xmm6 */ | |
101 | -1, /* mxcsr */ | |
102 | ORIG_EAX | |
d4f3574e SS |
103 | }; |
104 | ||
5c44784c JM |
105 | /* Which ptrace request retrieves which registers? |
106 | These apply to the corresponding SET requests as well. */ | |
e64a344c | 107 | |
5c44784c | 108 | #define GETREGS_SUPPLIES(regno) \ |
3fb1c838 | 109 | ((0 <= (regno) && (regno) <= 15) || (regno) == I386_LINUX_ORIG_EAX_REGNUM) |
e64a344c | 110 | |
6ce2ac0b | 111 | #define GETFPXREGS_SUPPLIES(regno) \ |
f6792ef4 | 112 | (I386_ST0_REGNUM <= (regno) && (regno) < I386_SSE_NUM_REGS) |
5c44784c | 113 | |
f60300e7 MK |
114 | /* Does the current host support the GETREGS request? */ |
115 | int have_ptrace_getregs = | |
116 | #ifdef HAVE_PTRACE_GETREGS | |
117 | 1 | |
118 | #else | |
119 | 0 | |
120 | #endif | |
121 | ; | |
122 | ||
6ce2ac0b | 123 | /* Does the current host support the GETFPXREGS request? The header |
5c44784c JM |
124 | file may or may not define it, and even if it is defined, the |
125 | kernel will return EIO if it's running on a pre-SSE processor. | |
126 | ||
127 | My instinct is to attach this to some architecture- or | |
128 | target-specific data structure, but really, a particular GDB | |
129 | process can only run on top of one kernel at a time. So it's okay | |
130 | for this to be a simple variable. */ | |
6ce2ac0b MK |
131 | int have_ptrace_getfpxregs = |
132 | #ifdef HAVE_PTRACE_GETFPXREGS | |
5c44784c JM |
133 | 1 |
134 | #else | |
135 | 0 | |
136 | #endif | |
137 | ; | |
f60300e7 | 138 | \f |
6ce2ac0b | 139 | |
ce556f85 | 140 | /* Accessing registers through the U area, one at a time. */ |
f60300e7 MK |
141 | |
142 | /* Fetch one register. */ | |
143 | ||
144 | static void | |
56be3814 | 145 | fetch_register (struct regcache *regcache, int regno) |
f60300e7 | 146 | { |
f60300e7 | 147 | int tid; |
ce556f85 | 148 | int val; |
f60300e7 | 149 | |
ce556f85 | 150 | gdb_assert (!have_ptrace_getregs); |
de732108 | 151 | if (regmap[regno] == -1) |
f60300e7 | 152 | { |
56be3814 | 153 | regcache_raw_supply (regcache, regno, NULL); |
f60300e7 MK |
154 | return; |
155 | } | |
156 | ||
ce556f85 | 157 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
158 | tid = TIDGET (inferior_ptid); |
159 | if (tid == 0) | |
160 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 161 | |
ce556f85 | 162 | errno = 0; |
de732108 | 163 | val = ptrace (PTRACE_PEEKUSER, tid, 4 * regmap[regno], 0); |
ce556f85 | 164 | if (errno != 0) |
c9f4d572 UW |
165 | error (_("Couldn't read register %s (#%d): %s."), |
166 | gdbarch_register_name (current_gdbarch, regno), | |
ce556f85 | 167 | regno, safe_strerror (errno)); |
f60300e7 | 168 | |
56be3814 | 169 | regcache_raw_supply (regcache, regno, &val); |
f60300e7 MK |
170 | } |
171 | ||
f60300e7 MK |
172 | /* Store one register. */ |
173 | ||
174 | static void | |
56be3814 | 175 | store_register (const struct regcache *regcache, int regno) |
f60300e7 | 176 | { |
f60300e7 | 177 | int tid; |
ce556f85 | 178 | int val; |
f60300e7 | 179 | |
ce556f85 | 180 | gdb_assert (!have_ptrace_getregs); |
de732108 | 181 | if (regmap[regno] == -1) |
ce556f85 | 182 | return; |
f60300e7 | 183 | |
ce556f85 | 184 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
185 | tid = TIDGET (inferior_ptid); |
186 | if (tid == 0) | |
187 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
f60300e7 | 188 | |
ce556f85 | 189 | errno = 0; |
56be3814 | 190 | regcache_raw_collect (regcache, regno, &val); |
de732108 | 191 | ptrace (PTRACE_POKEUSER, tid, 4 * regmap[regno], val); |
ce556f85 | 192 | if (errno != 0) |
c9f4d572 UW |
193 | error (_("Couldn't write register %s (#%d): %s."), |
194 | gdbarch_register_name (current_gdbarch, regno), | |
ce556f85 | 195 | regno, safe_strerror (errno)); |
f60300e7 | 196 | } |
5c44784c | 197 | \f |
6ce2ac0b | 198 | |
04cd15b6 MK |
199 | /* Transfering the general-purpose registers between GDB, inferiors |
200 | and core files. */ | |
201 | ||
ad2a4d09 | 202 | /* Fill GDB's register array with the general-purpose register values |
04cd15b6 | 203 | in *GREGSETP. */ |
5c44784c | 204 | |
d4f3574e | 205 | void |
7f7fe91e | 206 | supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
d4f3574e | 207 | { |
7f7fe91e | 208 | const elf_greg_t *regp = (const elf_greg_t *) gregsetp; |
6ce2ac0b | 209 | int i; |
d4f3574e | 210 | |
98df6387 | 211 | for (i = 0; i < I386_NUM_GREGS; i++) |
7f7fe91e | 212 | regcache_raw_supply (regcache, i, regp + regmap[i]); |
3fb1c838 | 213 | |
f57d151a | 214 | if (I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch)) |
7f7fe91e | 215 | regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 216 | regp + ORIG_EAX); |
917317f4 JM |
217 | } |
218 | ||
04cd15b6 MK |
219 | /* Fill register REGNO (if it is a general-purpose register) in |
220 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
221 | do this for all registers. */ | |
6ce2ac0b | 222 | |
917317f4 | 223 | void |
7f7fe91e UW |
224 | fill_gregset (const struct regcache *regcache, |
225 | elf_gregset_t *gregsetp, int regno) | |
917317f4 | 226 | { |
6ce2ac0b MK |
227 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
228 | int i; | |
04cd15b6 | 229 | |
98df6387 | 230 | for (i = 0; i < I386_NUM_GREGS; i++) |
099a9414 | 231 | if (regno == -1 || regno == i) |
7f7fe91e | 232 | regcache_raw_collect (regcache, i, regp + regmap[i]); |
3fb1c838 | 233 | |
82ea117a | 234 | if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM) |
f57d151a | 235 | && I386_LINUX_ORIG_EAX_REGNUM < gdbarch_num_regs (current_gdbarch)) |
7f7fe91e | 236 | regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, |
31828840 | 237 | regp + ORIG_EAX); |
d4f3574e SS |
238 | } |
239 | ||
f60300e7 MK |
240 | #ifdef HAVE_PTRACE_GETREGS |
241 | ||
04cd15b6 MK |
242 | /* Fetch all general-purpose registers from process/thread TID and |
243 | store their values in GDB's register array. */ | |
d4f3574e | 244 | |
5c44784c | 245 | static void |
56be3814 | 246 | fetch_regs (struct regcache *regcache, int tid) |
5c44784c | 247 | { |
04cd15b6 | 248 | elf_gregset_t regs; |
2e024c20 | 249 | elf_gregset_t *regs_p = ®s; |
5c44784c | 250 | |
6ce2ac0b | 251 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
5c44784c | 252 | { |
f60300e7 MK |
253 | if (errno == EIO) |
254 | { | |
255 | /* The kernel we're running on doesn't support the GETREGS | |
256 | request. Reset `have_ptrace_getregs'. */ | |
257 | have_ptrace_getregs = 0; | |
258 | return; | |
259 | } | |
260 | ||
e2e0b3e5 | 261 | perror_with_name (_("Couldn't get registers")); |
5c44784c JM |
262 | } |
263 | ||
2e024c20 | 264 | supply_gregset (regcache, (const elf_gregset_t *) regs_p); |
5c44784c JM |
265 | } |
266 | ||
04cd15b6 MK |
267 | /* Store all valid general-purpose registers in GDB's register array |
268 | into the process/thread specified by TID. */ | |
5c44784c | 269 | |
5c44784c | 270 | static void |
56be3814 | 271 | store_regs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 272 | { |
04cd15b6 | 273 | elf_gregset_t regs; |
5c44784c | 274 | |
6ce2ac0b | 275 | if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) |
e2e0b3e5 | 276 | perror_with_name (_("Couldn't get registers")); |
5c44784c | 277 | |
56be3814 | 278 | fill_gregset (regcache, ®s, regno); |
6ce2ac0b MK |
279 | |
280 | if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) | |
e2e0b3e5 | 281 | perror_with_name (_("Couldn't write registers")); |
5c44784c JM |
282 | } |
283 | ||
f60300e7 MK |
284 | #else |
285 | ||
56be3814 UW |
286 | static void fetch_regs (struct regcache *regcache, int tid) {} |
287 | static void store_regs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
288 | |
289 | #endif | |
5c44784c | 290 | \f |
5c44784c | 291 | |
6ce2ac0b | 292 | /* Transfering floating-point registers between GDB, inferiors and cores. */ |
d4f3574e | 293 | |
04cd15b6 | 294 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 295 | *FPREGSETP. */ |
04cd15b6 | 296 | |
d4f3574e | 297 | void |
7f7fe91e | 298 | supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
d4f3574e | 299 | { |
7f7fe91e | 300 | i387_supply_fsave (regcache, -1, fpregsetp); |
917317f4 | 301 | } |
d4f3574e | 302 | |
04cd15b6 MK |
303 | /* Fill register REGNO (if it is a floating-point register) in |
304 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
305 | do this for all registers. */ | |
917317f4 JM |
306 | |
307 | void | |
7f7fe91e UW |
308 | fill_fpregset (const struct regcache *regcache, |
309 | elf_fpregset_t *fpregsetp, int regno) | |
917317f4 | 310 | { |
7f7fe91e | 311 | i387_collect_fsave (regcache, regno, fpregsetp); |
d4f3574e SS |
312 | } |
313 | ||
f60300e7 MK |
314 | #ifdef HAVE_PTRACE_GETREGS |
315 | ||
04cd15b6 MK |
316 | /* Fetch all floating-point registers from process/thread TID and store |
317 | thier values in GDB's register array. */ | |
917317f4 | 318 | |
d4f3574e | 319 | static void |
56be3814 | 320 | fetch_fpregs (struct regcache *regcache, int tid) |
d4f3574e | 321 | { |
04cd15b6 | 322 | elf_fpregset_t fpregs; |
d4f3574e | 323 | |
6ce2ac0b | 324 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 325 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 326 | |
56be3814 | 327 | supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs); |
d4f3574e SS |
328 | } |
329 | ||
04cd15b6 MK |
330 | /* Store all valid floating-point registers in GDB's register array |
331 | into the process/thread specified by TID. */ | |
d4f3574e | 332 | |
d4f3574e | 333 | static void |
56be3814 | 334 | store_fpregs (const struct regcache *regcache, int tid, int regno) |
d4f3574e | 335 | { |
04cd15b6 | 336 | elf_fpregset_t fpregs; |
d4f3574e | 337 | |
6ce2ac0b | 338 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 339 | perror_with_name (_("Couldn't get floating point status")); |
d4f3574e | 340 | |
56be3814 | 341 | fill_fpregset (regcache, &fpregs, regno); |
d4f3574e | 342 | |
6ce2ac0b | 343 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0) |
e2e0b3e5 | 344 | perror_with_name (_("Couldn't write floating point status")); |
d4f3574e SS |
345 | } |
346 | ||
f60300e7 MK |
347 | #else |
348 | ||
56be3814 UW |
349 | static void fetch_fpregs (struct regcache *regcache, int tid) {} |
350 | static void store_fpregs (const struct regcache *regcache, int tid, int regno) {} | |
f60300e7 MK |
351 | |
352 | #endif | |
5c44784c | 353 | \f |
d4f3574e | 354 | |
6ce2ac0b | 355 | /* Transfering floating-point and SSE registers to and from GDB. */ |
11cf8741 | 356 | |
6ce2ac0b | 357 | #ifdef HAVE_PTRACE_GETFPXREGS |
04cd15b6 MK |
358 | |
359 | /* Fill GDB's register array with the floating-point and SSE register | |
6ce2ac0b | 360 | values in *FPXREGSETP. */ |
04cd15b6 | 361 | |
975aec09 | 362 | void |
7f7fe91e UW |
363 | supply_fpxregset (struct regcache *regcache, |
364 | const elf_fpxregset_t *fpxregsetp) | |
d4f3574e | 365 | { |
7f7fe91e | 366 | i387_supply_fxsave (regcache, -1, fpxregsetp); |
d4f3574e SS |
367 | } |
368 | ||
6ce2ac0b MK |
369 | /* Fill register REGNO (if it is a floating-point or SSE register) in |
370 | *FPXREGSETP with the value in GDB's register array. If REGNO is | |
371 | -1, do this for all registers. */ | |
d4f3574e | 372 | |
975aec09 | 373 | void |
7f7fe91e UW |
374 | fill_fpxregset (const struct regcache *regcache, |
375 | elf_fpxregset_t *fpxregsetp, int regno) | |
d4f3574e | 376 | { |
7f7fe91e | 377 | i387_collect_fxsave (regcache, regno, fpxregsetp); |
5c44784c JM |
378 | } |
379 | ||
6ce2ac0b | 380 | /* Fetch all registers covered by the PTRACE_GETFPXREGS request from |
04cd15b6 MK |
381 | process/thread TID and store their values in GDB's register array. |
382 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 383 | |
5c44784c | 384 | static int |
56be3814 | 385 | fetch_fpxregs (struct regcache *regcache, int tid) |
5c44784c | 386 | { |
6ce2ac0b | 387 | elf_fpxregset_t fpxregs; |
5c44784c | 388 | |
6ce2ac0b | 389 | if (! have_ptrace_getfpxregs) |
5c44784c JM |
390 | return 0; |
391 | ||
6ce2ac0b | 392 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) |
d4f3574e | 393 | { |
5c44784c JM |
394 | if (errno == EIO) |
395 | { | |
6ce2ac0b | 396 | have_ptrace_getfpxregs = 0; |
5c44784c JM |
397 | return 0; |
398 | } | |
399 | ||
e2e0b3e5 | 400 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
d4f3574e SS |
401 | } |
402 | ||
56be3814 | 403 | supply_fpxregset (regcache, (const elf_fpxregset_t *) &fpxregs); |
5c44784c JM |
404 | return 1; |
405 | } | |
d4f3574e | 406 | |
04cd15b6 | 407 | /* Store all valid registers in GDB's register array covered by the |
6ce2ac0b | 408 | PTRACE_SETFPXREGS request into the process/thread specified by TID. |
04cd15b6 | 409 | Return non-zero if successful, zero otherwise. */ |
5c44784c | 410 | |
5c44784c | 411 | static int |
56be3814 | 412 | store_fpxregs (const struct regcache *regcache, int tid, int regno) |
5c44784c | 413 | { |
6ce2ac0b | 414 | elf_fpxregset_t fpxregs; |
5c44784c | 415 | |
6ce2ac0b | 416 | if (! have_ptrace_getfpxregs) |
5c44784c | 417 | return 0; |
6ce2ac0b MK |
418 | |
419 | if (ptrace (PTRACE_GETFPXREGS, tid, 0, &fpxregs) == -1) | |
2866d305 MK |
420 | { |
421 | if (errno == EIO) | |
422 | { | |
423 | have_ptrace_getfpxregs = 0; | |
424 | return 0; | |
425 | } | |
426 | ||
e2e0b3e5 | 427 | perror_with_name (_("Couldn't read floating-point and SSE registers")); |
2866d305 | 428 | } |
5c44784c | 429 | |
56be3814 | 430 | fill_fpxregset (regcache, &fpxregs, regno); |
5c44784c | 431 | |
6ce2ac0b | 432 | if (ptrace (PTRACE_SETFPXREGS, tid, 0, &fpxregs) == -1) |
e2e0b3e5 | 433 | perror_with_name (_("Couldn't write floating-point and SSE registers")); |
5c44784c JM |
434 | |
435 | return 1; | |
436 | } | |
437 | ||
5c44784c JM |
438 | #else |
439 | ||
56be3814 UW |
440 | static int fetch_fpxregs (struct regcache *regcache, int tid) { return 0; } |
441 | static int store_fpxregs (const struct regcache *regcache, int tid, int regno) { return 0; } | |
5c44784c | 442 | |
6ce2ac0b | 443 | #endif /* HAVE_PTRACE_GETFPXREGS */ |
5c44784c | 444 | \f |
6ce2ac0b | 445 | |
5c44784c | 446 | /* Transferring arbitrary registers between GDB and inferior. */ |
d4f3574e | 447 | |
04cd15b6 MK |
448 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
449 | this for all registers (including the floating point and SSE | |
450 | registers). */ | |
d4f3574e | 451 | |
10d6c8cd | 452 | static void |
56be3814 | 453 | i386_linux_fetch_inferior_registers (struct regcache *regcache, int regno) |
d4f3574e | 454 | { |
ed9a39eb JM |
455 | int tid; |
456 | ||
f60300e7 MK |
457 | /* Use the old method of peeking around in `struct user' if the |
458 | GETREGS request isn't available. */ | |
ce556f85 | 459 | if (!have_ptrace_getregs) |
f60300e7 | 460 | { |
ce556f85 MK |
461 | int i; |
462 | ||
f57d151a | 463 | for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++) |
ce556f85 | 464 | if (regno == -1 || regno == i) |
56be3814 | 465 | fetch_register (regcache, i); |
ce556f85 | 466 | |
f60300e7 MK |
467 | return; |
468 | } | |
469 | ||
a4b6fc86 | 470 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
471 | tid = TIDGET (inferior_ptid); |
472 | if (tid == 0) | |
473 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 474 | |
6ce2ac0b | 475 | /* Use the PTRACE_GETFPXREGS request whenever possible, since it |
04cd15b6 | 476 | transfers more registers in one system call, and we'll cache the |
6ce2ac0b | 477 | results. But remember that fetch_fpxregs can fail, and return |
04cd15b6 | 478 | zero. */ |
5c44784c JM |
479 | if (regno == -1) |
480 | { | |
56be3814 | 481 | fetch_regs (regcache, tid); |
f60300e7 MK |
482 | |
483 | /* The call above might reset `have_ptrace_getregs'. */ | |
ce556f85 | 484 | if (!have_ptrace_getregs) |
f60300e7 | 485 | { |
56be3814 | 486 | i386_linux_fetch_inferior_registers (regcache, regno); |
f60300e7 MK |
487 | return; |
488 | } | |
489 | ||
56be3814 | 490 | if (fetch_fpxregs (regcache, tid)) |
5c44784c | 491 | return; |
56be3814 | 492 | fetch_fpregs (regcache, tid); |
5c44784c JM |
493 | return; |
494 | } | |
d4f3574e | 495 | |
5c44784c JM |
496 | if (GETREGS_SUPPLIES (regno)) |
497 | { | |
56be3814 | 498 | fetch_regs (regcache, tid); |
5c44784c JM |
499 | return; |
500 | } | |
501 | ||
6ce2ac0b | 502 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 503 | { |
56be3814 | 504 | if (fetch_fpxregs (regcache, tid)) |
5c44784c JM |
505 | return; |
506 | ||
507 | /* Either our processor or our kernel doesn't support the SSE | |
508 | registers, so read the FP registers in the traditional way, | |
509 | and fill the SSE registers with dummy values. It would be | |
510 | more graceful to handle differences in the register set using | |
511 | gdbarch. Until then, this will at least make things work | |
512 | plausibly. */ | |
56be3814 | 513 | fetch_fpregs (regcache, tid); |
5c44784c JM |
514 | return; |
515 | } | |
516 | ||
8e65ff28 | 517 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 518 | _("Got request for bad register number %d."), regno); |
d4f3574e SS |
519 | } |
520 | ||
04cd15b6 MK |
521 | /* Store register REGNO back into the child process. If REGNO is -1, |
522 | do this for all registers (including the floating point and SSE | |
523 | registers). */ | |
10d6c8cd | 524 | static void |
56be3814 | 525 | i386_linux_store_inferior_registers (struct regcache *regcache, int regno) |
d4f3574e | 526 | { |
ed9a39eb JM |
527 | int tid; |
528 | ||
f60300e7 MK |
529 | /* Use the old method of poking around in `struct user' if the |
530 | SETREGS request isn't available. */ | |
ce556f85 | 531 | if (!have_ptrace_getregs) |
f60300e7 | 532 | { |
ce556f85 MK |
533 | int i; |
534 | ||
f57d151a | 535 | for (i = 0; i < gdbarch_num_regs (current_gdbarch); i++) |
ce556f85 | 536 | if (regno == -1 || regno == i) |
56be3814 | 537 | store_register (regcache, i); |
ce556f85 | 538 | |
f60300e7 MK |
539 | return; |
540 | } | |
541 | ||
a4b6fc86 | 542 | /* GNU/Linux LWP ID's are process ID's. */ |
e64a344c MK |
543 | tid = TIDGET (inferior_ptid); |
544 | if (tid == 0) | |
545 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
ed9a39eb | 546 | |
6ce2ac0b | 547 | /* Use the PTRACE_SETFPXREGS requests whenever possible, since it |
04cd15b6 | 548 | transfers more registers in one system call. But remember that |
6ce2ac0b | 549 | store_fpxregs can fail, and return zero. */ |
5c44784c JM |
550 | if (regno == -1) |
551 | { | |
56be3814 UW |
552 | store_regs (regcache, tid, regno); |
553 | if (store_fpxregs (regcache, tid, regno)) | |
5c44784c | 554 | return; |
56be3814 | 555 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
556 | return; |
557 | } | |
d4f3574e | 558 | |
5c44784c JM |
559 | if (GETREGS_SUPPLIES (regno)) |
560 | { | |
56be3814 | 561 | store_regs (regcache, tid, regno); |
5c44784c JM |
562 | return; |
563 | } | |
564 | ||
6ce2ac0b | 565 | if (GETFPXREGS_SUPPLIES (regno)) |
5c44784c | 566 | { |
56be3814 | 567 | if (store_fpxregs (regcache, tid, regno)) |
5c44784c JM |
568 | return; |
569 | ||
570 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
571 | registers, so just write the FP registers in the traditional |
572 | way. */ | |
56be3814 | 573 | store_fpregs (regcache, tid, regno); |
5c44784c JM |
574 | return; |
575 | } | |
576 | ||
8e65ff28 | 577 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 578 | _("Got request to store bad register number %d."), regno); |
d4f3574e | 579 | } |
de57eccd | 580 | \f |
6ce2ac0b | 581 | |
4ffc8466 MK |
582 | /* Support for debug registers. */ |
583 | ||
7bf0983e | 584 | static unsigned long |
84346e11 MK |
585 | i386_linux_dr_get (int regnum) |
586 | { | |
587 | int tid; | |
7bf0983e | 588 | unsigned long value; |
84346e11 MK |
589 | |
590 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
591 | multi-threaded processes here. For now, pretend there is just | |
592 | one thread. */ | |
39f77062 | 593 | tid = PIDGET (inferior_ptid); |
84346e11 | 594 | |
b9511b9a MK |
595 | /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
596 | ptrace call fails breaks debugging remote targets. The correct | |
597 | way to fix this is to add the hardware breakpoint and watchpoint | |
7532965f | 598 | stuff to the target vector. For now, just return zero if the |
b9511b9a | 599 | ptrace call fails. */ |
84346e11 | 600 | errno = 0; |
ce556f85 | 601 | value = ptrace (PTRACE_PEEKUSER, tid, |
84346e11 MK |
602 | offsetof (struct user, u_debugreg[regnum]), 0); |
603 | if (errno != 0) | |
b9511b9a | 604 | #if 0 |
e2e0b3e5 | 605 | perror_with_name (_("Couldn't read debug register")); |
b9511b9a MK |
606 | #else |
607 | return 0; | |
608 | #endif | |
84346e11 MK |
609 | |
610 | return value; | |
611 | } | |
612 | ||
613 | static void | |
7bf0983e | 614 | i386_linux_dr_set (int regnum, unsigned long value) |
84346e11 MK |
615 | { |
616 | int tid; | |
617 | ||
618 | /* FIXME: kettenis/2001-01-29: It's not clear what we should do with | |
619 | multi-threaded processes here. For now, pretend there is just | |
620 | one thread. */ | |
39f77062 | 621 | tid = PIDGET (inferior_ptid); |
84346e11 MK |
622 | |
623 | errno = 0; | |
ce556f85 | 624 | ptrace (PTRACE_POKEUSER, tid, |
84346e11 MK |
625 | offsetof (struct user, u_debugreg[regnum]), value); |
626 | if (errno != 0) | |
e2e0b3e5 | 627 | perror_with_name (_("Couldn't write debug register")); |
84346e11 MK |
628 | } |
629 | ||
630 | void | |
7bf0983e | 631 | i386_linux_dr_set_control (unsigned long control) |
84346e11 MK |
632 | { |
633 | i386_linux_dr_set (DR_CONTROL, control); | |
634 | } | |
635 | ||
636 | void | |
637 | i386_linux_dr_set_addr (int regnum, CORE_ADDR addr) | |
638 | { | |
639 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
640 | ||
641 | i386_linux_dr_set (DR_FIRSTADDR + regnum, addr); | |
642 | } | |
643 | ||
644 | void | |
645 | i386_linux_dr_reset_addr (int regnum) | |
646 | { | |
647 | gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); | |
648 | ||
649 | i386_linux_dr_set (DR_FIRSTADDR + regnum, 0L); | |
650 | } | |
651 | ||
7bf0983e | 652 | unsigned long |
84346e11 MK |
653 | i386_linux_dr_get_status (void) |
654 | { | |
655 | return i386_linux_dr_get (DR_STATUS); | |
656 | } | |
657 | \f | |
658 | ||
5bca7895 MK |
659 | /* Called by libthread_db. Returns a pointer to the thread local |
660 | storage (or its descriptor). */ | |
661 | ||
662 | ps_err_e | |
663 | ps_get_thread_area (const struct ps_prochandle *ph, | |
664 | lwpid_t lwpid, int idx, void **base) | |
665 | { | |
666 | /* NOTE: cagney/2003-08-26: The definition of this buffer is found | |
667 | in the kernel header <asm-i386/ldt.h>. It, after padding, is 4 x | |
668 | 4 byte integers in size: `entry_number', `base_addr', `limit', | |
669 | and a bunch of status bits. | |
670 | ||
671 | The values returned by this ptrace call should be part of the | |
672 | regcache buffer, and ps_get_thread_area should channel its | |
673 | request through the regcache. That way remote targets could | |
674 | provide the value using the remote protocol and not this direct | |
675 | call. | |
676 | ||
677 | Is this function needed? I'm guessing that the `base' is the | |
678 | address of a a descriptor that libthread_db uses to find the | |
b2fa5097 | 679 | thread local address base that GDB needs. Perhaps that |
5bca7895 MK |
680 | descriptor is defined by the ABI. Anyway, given that |
681 | libthread_db calls this function without prompting (gdb | |
682 | requesting tls base) I guess it needs info in there anyway. */ | |
683 | unsigned int desc[4]; | |
684 | gdb_assert (sizeof (int) == 4); | |
685 | ||
686 | #ifndef PTRACE_GET_THREAD_AREA | |
687 | #define PTRACE_GET_THREAD_AREA 25 | |
688 | #endif | |
689 | ||
690 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, | |
691 | (void *) idx, (unsigned long) &desc) < 0) | |
692 | return PS_ERR; | |
693 | ||
694 | *(int *)base = desc[1]; | |
695 | return PS_OK; | |
696 | } | |
697 | \f | |
698 | ||
a4b6fc86 | 699 | /* The instruction for a GNU/Linux system call is: |
a6abb2c0 MK |
700 | int $0x80 |
701 | or 0xcd 0x80. */ | |
702 | ||
703 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
704 | ||
705 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
706 | ||
707 | /* The system call number is stored in the %eax register. */ | |
7532965f | 708 | #define LINUX_SYSCALL_REGNUM I386_EAX_REGNUM |
a6abb2c0 MK |
709 | |
710 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
711 | system calls. */ | |
712 | ||
713 | #ifndef SYS_sigreturn | |
714 | #define SYS_sigreturn 0x77 | |
715 | #endif | |
716 | #ifndef SYS_rt_sigreturn | |
717 | #define SYS_rt_sigreturn 0xad | |
718 | #endif | |
719 | ||
720 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
721 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
722 | ||
723 | /* Resume execution of the inferior process. | |
724 | If STEP is nonzero, single-step it. | |
725 | If SIGNAL is nonzero, give it that signal. */ | |
726 | ||
10d6c8cd DJ |
727 | static void |
728 | i386_linux_resume (ptid_t ptid, int step, enum target_signal signal) | |
a6abb2c0 | 729 | { |
39f77062 KB |
730 | int pid = PIDGET (ptid); |
731 | ||
a6abb2c0 MK |
732 | int request = PTRACE_CONT; |
733 | ||
734 | if (pid == -1) | |
735 | /* Resume all threads. */ | |
736 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
737 | all threads" and "resume inferior_ptid" are the same. */ |
738 | pid = PIDGET (inferior_ptid); | |
a6abb2c0 MK |
739 | |
740 | if (step) | |
741 | { | |
594f7785 | 742 | struct regcache *regcache = get_thread_regcache (pid_to_ptid (pid)); |
7b86a1b8 | 743 | ULONGEST pc; |
8e70166d | 744 | gdb_byte buf[LINUX_SYSCALL_LEN]; |
a6abb2c0 MK |
745 | |
746 | request = PTRACE_SINGLESTEP; | |
747 | ||
3e8c568d UW |
748 | regcache_cooked_read_unsigned (regcache, |
749 | gdbarch_pc_regnum (current_gdbarch), &pc); | |
7b86a1b8 | 750 | |
a6abb2c0 MK |
751 | /* Returning from a signal trampoline is done by calling a |
752 | special system call (sigreturn or rt_sigreturn, see | |
753 | i386-linux-tdep.c for more information). This system call | |
754 | restores the registers that were saved when the signal was | |
755 | raised, including %eflags. That means that single-stepping | |
756 | won't work. Instead, we'll have to modify the signal context | |
757 | that's about to be restored, and set the trace flag there. */ | |
758 | ||
759 | /* First check if PC is at a system call. */ | |
359a9262 | 760 | if (read_memory_nobpt (pc, buf, LINUX_SYSCALL_LEN) == 0 |
a6abb2c0 MK |
761 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) |
762 | { | |
7b86a1b8 UW |
763 | ULONGEST syscall; |
764 | regcache_cooked_read_unsigned (regcache, | |
765 | LINUX_SYSCALL_REGNUM, &syscall); | |
a6abb2c0 MK |
766 | |
767 | /* Then check the system call number. */ | |
768 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
769 | { | |
7b86a1b8 | 770 | ULONGEST sp, addr; |
a6abb2c0 | 771 | unsigned long int eflags; |
7bf0983e | 772 | |
7b86a1b8 | 773 | regcache_cooked_read_unsigned (regcache, I386_ESP_REGNUM, &sp); |
a6abb2c0 MK |
774 | if (syscall == SYS_rt_sigreturn) |
775 | addr = read_memory_integer (sp + 8, 4) + 20; | |
7b86a1b8 UW |
776 | else |
777 | addr = sp; | |
a6abb2c0 MK |
778 | |
779 | /* Set the trace flag in the context that's about to be | |
780 | restored. */ | |
781 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
8e70166d | 782 | read_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 | 783 | eflags |= 0x0100; |
8e70166d | 784 | write_memory (addr, (gdb_byte *) &eflags, 4); |
a6abb2c0 MK |
785 | } |
786 | } | |
787 | } | |
788 | ||
789 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
e2e0b3e5 | 790 | perror_with_name (("ptrace")); |
a6abb2c0 | 791 | } |
4de4c07c | 792 | |
10d6c8cd DJ |
793 | static void (*super_post_startup_inferior) (ptid_t ptid); |
794 | ||
795 | static void | |
796 | i386_linux_child_post_startup_inferior (ptid_t ptid) | |
4de4c07c DJ |
797 | { |
798 | i386_cleanup_dregs (); | |
10d6c8cd DJ |
799 | super_post_startup_inferior (ptid); |
800 | } | |
801 | ||
802 | void | |
803 | _initialize_i386_linux_nat (void) | |
804 | { | |
805 | struct target_ops *t; | |
806 | ||
807 | /* Fill in the generic GNU/Linux methods. */ | |
808 | t = linux_target (); | |
809 | ||
810 | /* Override the default ptrace resume method. */ | |
811 | t->to_resume = i386_linux_resume; | |
812 | ||
813 | /* Override the GNU/Linux inferior startup hook. */ | |
814 | super_post_startup_inferior = t->to_post_startup_inferior; | |
815 | t->to_post_startup_inferior = i386_linux_child_post_startup_inferior; | |
816 | ||
817 | /* Add our register access methods. */ | |
818 | t->to_fetch_registers = i386_linux_fetch_inferior_registers; | |
819 | t->to_store_registers = i386_linux_store_inferior_registers; | |
820 | ||
821 | /* Register the target. */ | |
f973ed9c | 822 | linux_nat_add_target (t); |
4de4c07c | 823 | } |