Commit | Line | Data |
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d4f3574e | 1 | /* Native-dependent code for Linux running on i386's, for GDB. |
ed40e7af | 2 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
d4f3574e | 3 | |
04cd15b6 | 4 | This file is part of GDB. |
d4f3574e | 5 | |
04cd15b6 MK |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
d4f3574e | 10 | |
04cd15b6 MK |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
d4f3574e | 15 | |
04cd15b6 MK |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
d4f3574e SS |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
24 | ||
04cd15b6 | 25 | /* For i386_linux_skip_solib_resolver. */ |
d4f3574e | 26 | #include "symtab.h" |
d4f3574e SS |
27 | #include "symfile.h" |
28 | #include "objfiles.h" | |
29 | ||
30 | #include <sys/ptrace.h> | |
31 | #include <sys/user.h> | |
32 | #include <sys/procfs.h> | |
33 | ||
34 | #ifdef HAVE_SYS_REG_H | |
35 | #include <sys/reg.h> | |
36 | #endif | |
37 | ||
c60c0f5f MS |
38 | /* Prototypes for supply_gregset etc. */ |
39 | #include "gregset.h" | |
40 | ||
04cd15b6 MK |
41 | /* On Linux, threads are implemented as pseudo-processes, in which |
42 | case we may be tracing more than one process at a time. In that | |
43 | case, inferior_pid will contain the main process ID and the | |
44 | individual thread (process) ID mashed together. These macros are | |
45 | used to separate them out. These definitions should be overridden | |
46 | if thread support is included. */ | |
ed9a39eb JM |
47 | |
48 | #if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */ | |
49 | #define PIDGET(PID) PID | |
50 | #define TIDGET(PID) 0 | |
51 | #endif | |
52 | ||
d4f3574e | 53 | |
04cd15b6 MK |
54 | /* The register sets used in Linux ELF core-dumps are identical to the |
55 | register sets in `struct user' that is used for a.out core-dumps, | |
56 | and is also used by `ptrace'. The corresponding types are | |
57 | `elf_gregset_t' for the general-purpose registers (with | |
58 | `elf_greg_t' the type of a single GP register) and `elf_fpregset_t' | |
59 | for the floating-point registers. | |
60 | ||
61 | Those types used to be available under the names `gregset_t' and | |
62 | `fpregset_t' too, and this file used those names in the past. But | |
63 | those names are now used for the register sets used in the | |
64 | `mcontext_t' type, and have a different size and layout. */ | |
65 | ||
66 | /* Mapping between the general-purpose registers in `struct user' | |
67 | format and GDB's register array layout. */ | |
d4f3574e SS |
68 | static int regmap[] = |
69 | { | |
70 | EAX, ECX, EDX, EBX, | |
71 | UESP, EBP, ESI, EDI, | |
72 | EIP, EFL, CS, SS, | |
04cd15b6 | 73 | DS, ES, FS, GS |
d4f3574e SS |
74 | }; |
75 | ||
5c44784c JM |
76 | /* Which ptrace request retrieves which registers? |
77 | These apply to the corresponding SET requests as well. */ | |
78 | #define GETREGS_SUPPLIES(regno) \ | |
79 | (0 <= (regno) && (regno) <= 15) | |
80 | #define GETFPREGS_SUPPLIES(regno) \ | |
81 | (FP0_REGNUM <= (regno) && (regno) <= LAST_FPU_CTRL_REGNUM) | |
82 | #define GETXFPREGS_SUPPLIES(regno) \ | |
83 | (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) | |
84 | ||
f60300e7 MK |
85 | /* Does the current host support the GETREGS request? */ |
86 | int have_ptrace_getregs = | |
87 | #ifdef HAVE_PTRACE_GETREGS | |
88 | 1 | |
89 | #else | |
90 | 0 | |
91 | #endif | |
92 | ; | |
93 | ||
5c44784c JM |
94 | /* Does the current host support the GETXFPREGS request? The header |
95 | file may or may not define it, and even if it is defined, the | |
96 | kernel will return EIO if it's running on a pre-SSE processor. | |
97 | ||
c2d11a7d JM |
98 | PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own |
99 | Linux kernel patch for SSE support. That patch may or may not | |
100 | actually make it into the official distribution. If you find that | |
101 | years have gone by since this stuff was added, and Linux isn't | |
102 | using PTRACE_GETXFPREGS, that means that our patch didn't make it, | |
103 | and you can delete this, and the related code. | |
104 | ||
5c44784c JM |
105 | My instinct is to attach this to some architecture- or |
106 | target-specific data structure, but really, a particular GDB | |
107 | process can only run on top of one kernel at a time. So it's okay | |
108 | for this to be a simple variable. */ | |
109 | int have_ptrace_getxfpregs = | |
110 | #ifdef HAVE_PTRACE_GETXFPREGS | |
111 | 1 | |
112 | #else | |
113 | 0 | |
114 | #endif | |
115 | ; | |
116 | ||
f60300e7 | 117 | \f |
97780f5f JB |
118 | /* Fetching registers directly from the U area, one at a time. */ |
119 | ||
f60300e7 MK |
120 | /* FIXME: kettenis/2000-03-05: This duplicates code from `inptrace.c'. |
121 | The problem is that we define FETCH_INFERIOR_REGISTERS since we | |
122 | want to use our own versions of {fetch,store}_inferior_registers | |
123 | that use the GETREGS request. This means that the code in | |
124 | `infptrace.c' is #ifdef'd out. But we need to fall back on that | |
125 | code when GDB is running on top of a kernel that doesn't support | |
126 | the GETREGS request. I want to avoid changing `infptrace.c' right | |
127 | now. */ | |
128 | ||
318b21ef MK |
129 | #ifndef PT_READ_U |
130 | #define PT_READ_U PTRACE_PEEKUSR | |
131 | #endif | |
132 | #ifndef PT_WRITE_U | |
133 | #define PT_WRITE_U PTRACE_POKEUSR | |
134 | #endif | |
135 | ||
f60300e7 MK |
136 | /* Default the type of the ptrace transfer to int. */ |
137 | #ifndef PTRACE_XFER_TYPE | |
138 | #define PTRACE_XFER_TYPE int | |
139 | #endif | |
140 | ||
141 | /* Registers we shouldn't try to fetch. */ | |
142 | #if !defined (CANNOT_FETCH_REGISTER) | |
143 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
144 | #endif | |
145 | ||
146 | /* Fetch one register. */ | |
147 | ||
148 | static void | |
149 | fetch_register (regno) | |
150 | int regno; | |
151 | { | |
152 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
153 | CORE_ADDR regaddr; | |
154 | char mess[128]; /* For messages */ | |
155 | register int i; | |
156 | unsigned int offset; /* Offset of registers within the u area. */ | |
157 | char buf[MAX_REGISTER_RAW_SIZE]; | |
158 | int tid; | |
159 | ||
160 | if (CANNOT_FETCH_REGISTER (regno)) | |
161 | { | |
162 | memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
163 | supply_register (regno, buf); | |
164 | return; | |
165 | } | |
166 | ||
167 | /* Overload thread id onto process id */ | |
168 | if ((tid = TIDGET (inferior_pid)) == 0) | |
169 | tid = inferior_pid; /* no thread id, just use process id */ | |
170 | ||
171 | offset = U_REGS_OFFSET; | |
172 | ||
173 | regaddr = register_addr (regno, offset); | |
174 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) | |
175 | { | |
176 | errno = 0; | |
177 | *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, | |
178 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
179 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
180 | if (errno != 0) | |
181 | { | |
182 | sprintf (mess, "reading register %s (#%d)", | |
183 | REGISTER_NAME (regno), regno); | |
184 | perror_with_name (mess); | |
185 | } | |
186 | } | |
187 | supply_register (regno, buf); | |
188 | } | |
189 | ||
190 | /* Fetch register values from the inferior. | |
191 | If REGNO is negative, do this for all registers. | |
192 | Otherwise, REGNO specifies which register (so we can save time). */ | |
193 | ||
194 | void | |
195 | old_fetch_inferior_registers (regno) | |
196 | int regno; | |
197 | { | |
198 | if (regno >= 0) | |
199 | { | |
200 | fetch_register (regno); | |
201 | } | |
202 | else | |
203 | { | |
204 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) | |
205 | { | |
206 | fetch_register (regno); | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
211 | /* Registers we shouldn't try to store. */ | |
212 | #if !defined (CANNOT_STORE_REGISTER) | |
213 | #define CANNOT_STORE_REGISTER(regno) 0 | |
214 | #endif | |
215 | ||
216 | /* Store one register. */ | |
217 | ||
218 | static void | |
219 | store_register (regno) | |
220 | int regno; | |
221 | { | |
222 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
223 | CORE_ADDR regaddr; | |
224 | char mess[128]; /* For messages */ | |
225 | register int i; | |
226 | unsigned int offset; /* Offset of registers within the u area. */ | |
227 | int tid; | |
228 | ||
229 | if (CANNOT_STORE_REGISTER (regno)) | |
230 | { | |
231 | return; | |
232 | } | |
233 | ||
234 | /* Overload thread id onto process id */ | |
235 | if ((tid = TIDGET (inferior_pid)) == 0) | |
236 | tid = inferior_pid; /* no thread id, just use process id */ | |
237 | ||
238 | offset = U_REGS_OFFSET; | |
239 | ||
240 | regaddr = register_addr (regno, offset); | |
241 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) | |
242 | { | |
243 | errno = 0; | |
244 | ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, | |
245 | *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]); | |
246 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
247 | if (errno != 0) | |
248 | { | |
249 | sprintf (mess, "writing register %s (#%d)", | |
250 | REGISTER_NAME (regno), regno); | |
251 | perror_with_name (mess); | |
252 | } | |
253 | } | |
254 | } | |
255 | ||
256 | /* Store our register values back into the inferior. | |
257 | If REGNO is negative, do this for all registers. | |
258 | Otherwise, REGNO specifies which register (so we can save time). */ | |
259 | ||
260 | void | |
261 | old_store_inferior_registers (regno) | |
262 | int regno; | |
263 | { | |
264 | if (regno >= 0) | |
265 | { | |
266 | store_register (regno); | |
267 | } | |
268 | else | |
269 | { | |
270 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) | |
271 | { | |
272 | store_register (regno); | |
273 | } | |
274 | } | |
275 | } | |
276 | ||
5c44784c | 277 | \f |
04cd15b6 MK |
278 | /* Transfering the general-purpose registers between GDB, inferiors |
279 | and core files. */ | |
280 | ||
281 | /* Fill GDB's register array with the genereal-purpose register values | |
282 | in *GREGSETP. */ | |
5c44784c | 283 | |
d4f3574e | 284 | void |
04cd15b6 | 285 | supply_gregset (elf_gregset_t *gregsetp) |
d4f3574e | 286 | { |
04cd15b6 MK |
287 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
288 | int regi; | |
d4f3574e | 289 | |
917317f4 | 290 | for (regi = 0; regi < NUM_GREGS; regi++) |
04cd15b6 | 291 | supply_register (regi, (char *) (regp + regmap[regi])); |
d4f3574e SS |
292 | } |
293 | ||
04cd15b6 MK |
294 | /* Convert the valid general-purpose register values in GDB's register |
295 | array to `struct user' format and store them in *GREGSETP. The | |
296 | array VALID indicates which register values are valid. If VALID is | |
297 | NULL, all registers are assumed to be valid. */ | |
5c44784c | 298 | |
04cd15b6 MK |
299 | static void |
300 | convert_to_gregset (elf_gregset_t *gregsetp, signed char *valid) | |
d4f3574e | 301 | { |
04cd15b6 | 302 | elf_greg_t *regp = (elf_greg_t *) gregsetp; |
d4f3574e | 303 | int regi; |
d4f3574e | 304 | |
917317f4 JM |
305 | for (regi = 0; regi < NUM_GREGS; regi++) |
306 | if (! valid || valid[regi]) | |
307 | *(regp + regmap[regi]) = * (int *) ®isters[REGISTER_BYTE (regi)]; | |
308 | } | |
309 | ||
04cd15b6 MK |
310 | /* Fill register REGNO (if it is a general-purpose register) in |
311 | *GREGSETPS with the value in GDB's register array. If REGNO is -1, | |
312 | do this for all registers. */ | |
917317f4 | 313 | void |
04cd15b6 | 314 | fill_gregset (elf_gregset_t *gregsetp, int regno) |
917317f4 JM |
315 | { |
316 | if (regno == -1) | |
04cd15b6 MK |
317 | { |
318 | convert_to_gregset (gregsetp, NULL); | |
319 | return; | |
320 | } | |
321 | ||
322 | if (GETREGS_SUPPLIES (regno)) | |
d4f3574e | 323 | { |
917317f4 | 324 | signed char valid[NUM_GREGS]; |
04cd15b6 | 325 | |
917317f4 JM |
326 | memset (valid, 0, sizeof (valid)); |
327 | valid[regno] = 1; | |
04cd15b6 MK |
328 | |
329 | convert_to_gregset (gregsetp, valid); | |
d4f3574e SS |
330 | } |
331 | } | |
332 | ||
f60300e7 MK |
333 | #ifdef HAVE_PTRACE_GETREGS |
334 | ||
04cd15b6 MK |
335 | /* Fetch all general-purpose registers from process/thread TID and |
336 | store their values in GDB's register array. */ | |
d4f3574e | 337 | |
5c44784c | 338 | static void |
ed9a39eb | 339 | fetch_regs (int tid) |
5c44784c | 340 | { |
04cd15b6 MK |
341 | elf_gregset_t regs; |
342 | int ret; | |
5c44784c | 343 | |
04cd15b6 | 344 | ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s); |
5c44784c JM |
345 | if (ret < 0) |
346 | { | |
f60300e7 MK |
347 | if (errno == EIO) |
348 | { | |
349 | /* The kernel we're running on doesn't support the GETREGS | |
350 | request. Reset `have_ptrace_getregs'. */ | |
351 | have_ptrace_getregs = 0; | |
352 | return; | |
353 | } | |
354 | ||
04cd15b6 | 355 | warning ("Couldn't get registers."); |
5c44784c JM |
356 | return; |
357 | } | |
358 | ||
04cd15b6 | 359 | supply_gregset (®s); |
5c44784c JM |
360 | } |
361 | ||
04cd15b6 MK |
362 | /* Store all valid general-purpose registers in GDB's register array |
363 | into the process/thread specified by TID. */ | |
5c44784c | 364 | |
5c44784c | 365 | static void |
ed9a39eb | 366 | store_regs (int tid) |
5c44784c | 367 | { |
04cd15b6 MK |
368 | elf_gregset_t regs; |
369 | int ret; | |
5c44784c | 370 | |
04cd15b6 | 371 | ret = ptrace (PTRACE_GETREGS, tid, 0, (int) ®s); |
5c44784c JM |
372 | if (ret < 0) |
373 | { | |
04cd15b6 | 374 | warning ("Couldn't get registers."); |
5c44784c JM |
375 | return; |
376 | } | |
377 | ||
04cd15b6 | 378 | convert_to_gregset (®s, register_valid); |
5c44784c | 379 | |
04cd15b6 | 380 | ret = ptrace (PTRACE_SETREGS, tid, 0, (int) ®s); |
5c44784c JM |
381 | if (ret < 0) |
382 | { | |
04cd15b6 | 383 | warning ("Couldn't write registers."); |
5c44784c JM |
384 | return; |
385 | } | |
386 | } | |
387 | ||
f60300e7 MK |
388 | #else |
389 | ||
390 | static void fetch_regs (int tid) {} | |
391 | static void store_regs (int tid) {} | |
392 | ||
393 | #endif | |
394 | ||
5c44784c JM |
395 | \f |
396 | /* Transfering floating-point registers between GDB, inferiors and cores. */ | |
397 | ||
04cd15b6 MK |
398 | /* What is the address of st(N) within the floating-point register set F? */ |
399 | #define FPREG_ADDR(f, n) ((char *) &(f)->st_space + (n) * 10) | |
d4f3574e | 400 | |
04cd15b6 | 401 | /* Fill GDB's register array with the floating-point register values in |
917317f4 | 402 | *FPREGSETP. */ |
04cd15b6 | 403 | |
d4f3574e | 404 | void |
04cd15b6 | 405 | supply_fpregset (elf_fpregset_t *fpregsetp) |
d4f3574e | 406 | { |
04cd15b6 | 407 | int reg; |
b948cda9 | 408 | long l; |
917317f4 JM |
409 | |
410 | /* Supply the floating-point registers. */ | |
04cd15b6 MK |
411 | for (reg = 0; reg < 8; reg++) |
412 | supply_register (FP0_REGNUM + reg, FPREG_ADDR (fpregsetp, reg)); | |
917317f4 | 413 | |
b948cda9 MK |
414 | /* We have to mask off the reserved bits in *FPREGSETP before |
415 | storing the values in GDB's register file. */ | |
416 | #define supply(REGNO, MEMBER) \ | |
417 | l = fpregsetp->MEMBER & 0xffff; \ | |
418 | supply_register (REGNO, (char *) &l) | |
419 | ||
420 | supply (FCTRL_REGNUM, cwd); | |
421 | supply (FSTAT_REGNUM, swd); | |
422 | supply (FTAG_REGNUM, twd); | |
917317f4 | 423 | supply_register (FCOFF_REGNUM, (char *) &fpregsetp->fip); |
b948cda9 | 424 | supply (FDS_REGNUM, fos); |
917317f4 | 425 | supply_register (FDOFF_REGNUM, (char *) &fpregsetp->foo); |
917317f4 | 426 | |
b948cda9 MK |
427 | #undef supply |
428 | ||
429 | /* Extract the code segment and opcode from the "fcs" member. */ | |
430 | l = fpregsetp->fcs & 0xffff; | |
431 | supply_register (FCS_REGNUM, (char *) &l); | |
917317f4 | 432 | |
b948cda9 MK |
433 | l = (fpregsetp->fcs >> 16) & ((1 << 11) - 1); |
434 | supply_register (FOP_REGNUM, (char *) &l); | |
d4f3574e SS |
435 | } |
436 | ||
04cd15b6 MK |
437 | /* Convert the valid floating-point register values in GDB's register |
438 | array to `struct user' format and store them in *FPREGSETP. The | |
439 | array VALID indicates which register values are valid. If VALID is | |
440 | NULL, all registers are assumed to be valid. */ | |
d4f3574e | 441 | |
04cd15b6 MK |
442 | static void |
443 | convert_to_fpregset (elf_fpregset_t *fpregsetp, signed char *valid) | |
d4f3574e | 444 | { |
04cd15b6 | 445 | int reg; |
917317f4 JM |
446 | |
447 | /* Fill in the floating-point registers. */ | |
04cd15b6 MK |
448 | for (reg = 0; reg < 8; reg++) |
449 | if (!valid || valid[reg]) | |
450 | memcpy (FPREG_ADDR (fpregsetp, reg), | |
451 | ®isters[REGISTER_BYTE (FP0_REGNUM + reg)], | |
452 | REGISTER_RAW_SIZE(FP0_REGNUM + reg)); | |
917317f4 | 453 | |
b948cda9 MK |
454 | /* We're not supposed to touch the reserved bits in *FPREGSETP. */ |
455 | ||
917317f4 JM |
456 | #define fill(MEMBER, REGNO) \ |
457 | if (! valid || valid[(REGNO)]) \ | |
b948cda9 MK |
458 | fpregsetp->MEMBER \ |
459 | = ((fpregsetp->MEMBER & ~0xffff) \ | |
460 | | (* (int *) ®isters[REGISTER_BYTE (REGNO)] & 0xffff)) | |
461 | ||
462 | #define fill_register(MEMBER, REGNO) \ | |
463 | if (! valid || valid[(REGNO)]) \ | |
464 | memcpy (&fpregsetp->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \ | |
465 | sizeof (fpregsetp->MEMBER)) | |
917317f4 JM |
466 | |
467 | fill (cwd, FCTRL_REGNUM); | |
468 | fill (swd, FSTAT_REGNUM); | |
469 | fill (twd, FTAG_REGNUM); | |
b948cda9 | 470 | fill_register (fip, FCOFF_REGNUM); |
917317f4 | 471 | fill (foo, FDOFF_REGNUM); |
b948cda9 | 472 | fill_register (fos, FDS_REGNUM); |
917317f4 JM |
473 | |
474 | #undef fill | |
b948cda9 | 475 | #undef fill_register |
917317f4 JM |
476 | |
477 | if (! valid || valid[FCS_REGNUM]) | |
478 | fpregsetp->fcs | |
479 | = ((fpregsetp->fcs & ~0xffff) | |
480 | | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff)); | |
481 | ||
482 | if (! valid || valid[FOP_REGNUM]) | |
483 | fpregsetp->fcs | |
484 | = ((fpregsetp->fcs & 0xffff) | |
485 | | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1)) | |
486 | << 16)); | |
487 | } | |
d4f3574e | 488 | |
04cd15b6 MK |
489 | /* Fill register REGNO (if it is a floating-point register) in |
490 | *FPREGSETP with the value in GDB's register array. If REGNO is -1, | |
491 | do this for all registers. */ | |
917317f4 JM |
492 | |
493 | void | |
04cd15b6 | 494 | fill_fpregset (elf_fpregset_t *fpregsetp, int regno) |
917317f4 | 495 | { |
04cd15b6 MK |
496 | if (regno == -1) |
497 | { | |
498 | convert_to_fpregset (fpregsetp, NULL); | |
499 | return; | |
500 | } | |
501 | ||
502 | if (GETFPREGS_SUPPLIES(regno)) | |
503 | { | |
504 | signed char valid[MAX_NUM_REGS]; | |
505 | ||
506 | memset (valid, 0, sizeof (valid)); | |
507 | valid[regno] = 1; | |
508 | ||
509 | convert_to_fpregset (fpregsetp, valid); | |
510 | } | |
d4f3574e SS |
511 | } |
512 | ||
f60300e7 MK |
513 | #ifdef HAVE_PTRACE_GETREGS |
514 | ||
04cd15b6 MK |
515 | /* Fetch all floating-point registers from process/thread TID and store |
516 | thier values in GDB's register array. */ | |
917317f4 | 517 | |
d4f3574e | 518 | static void |
ed9a39eb | 519 | fetch_fpregs (int tid) |
d4f3574e | 520 | { |
04cd15b6 MK |
521 | elf_fpregset_t fpregs; |
522 | int ret; | |
d4f3574e | 523 | |
04cd15b6 | 524 | ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs); |
917317f4 | 525 | if (ret < 0) |
d4f3574e | 526 | { |
04cd15b6 | 527 | warning ("Couldn't get floating point status."); |
d4f3574e SS |
528 | return; |
529 | } | |
530 | ||
04cd15b6 | 531 | supply_fpregset (&fpregs); |
d4f3574e SS |
532 | } |
533 | ||
04cd15b6 MK |
534 | /* Store all valid floating-point registers in GDB's register array |
535 | into the process/thread specified by TID. */ | |
d4f3574e | 536 | |
d4f3574e | 537 | static void |
ed9a39eb | 538 | store_fpregs (int tid) |
d4f3574e | 539 | { |
04cd15b6 | 540 | elf_fpregset_t fpregs; |
917317f4 | 541 | int ret; |
d4f3574e | 542 | |
04cd15b6 | 543 | ret = ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs); |
917317f4 | 544 | if (ret < 0) |
d4f3574e | 545 | { |
04cd15b6 | 546 | warning ("Couldn't get floating point status."); |
d4f3574e SS |
547 | return; |
548 | } | |
549 | ||
04cd15b6 | 550 | convert_to_fpregset (&fpregs, register_valid); |
d4f3574e | 551 | |
04cd15b6 | 552 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs); |
917317f4 | 553 | if (ret < 0) |
d4f3574e | 554 | { |
04cd15b6 | 555 | warning ("Couldn't write floating point status."); |
d4f3574e SS |
556 | return; |
557 | } | |
d4f3574e SS |
558 | } |
559 | ||
f60300e7 MK |
560 | #else |
561 | ||
562 | static void fetch_fpregs (int tid) {} | |
563 | static void store_fpregs (int tid) {} | |
564 | ||
565 | #endif | |
566 | ||
5c44784c JM |
567 | \f |
568 | /* Transfering floating-point and SSE registers to and from GDB. */ | |
d4f3574e | 569 | |
11cf8741 JM |
570 | /* PTRACE_GETXFPREGS is a Cygnus invention, since we wrote our own |
571 | Linux kernel patch for SSE support. That patch may or may not | |
572 | actually make it into the official distribution. If you find that | |
573 | years have gone by since this code was added, and Linux isn't using | |
574 | PTRACE_GETXFPREGS, that means that our patch didn't make it, and | |
575 | you can delete this code. */ | |
576 | ||
5c44784c | 577 | #ifdef HAVE_PTRACE_GETXFPREGS |
04cd15b6 MK |
578 | |
579 | /* Fill GDB's register array with the floating-point and SSE register | |
580 | values in *XFPREGS. */ | |
581 | ||
d4f3574e | 582 | static void |
5c44784c | 583 | supply_xfpregset (struct user_xfpregs_struct *xfpregs) |
d4f3574e | 584 | { |
5c44784c | 585 | int reg; |
d4f3574e | 586 | |
5c44784c JM |
587 | /* Supply the floating-point registers. */ |
588 | for (reg = 0; reg < 8; reg++) | |
589 | supply_register (FP0_REGNUM + reg, (char *) &xfpregs->st_space[reg]); | |
590 | ||
591 | { | |
592 | supply_register (FCTRL_REGNUM, (char *) &xfpregs->cwd); | |
593 | supply_register (FSTAT_REGNUM, (char *) &xfpregs->swd); | |
594 | supply_register (FTAG_REGNUM, (char *) &xfpregs->twd); | |
595 | supply_register (FCOFF_REGNUM, (char *) &xfpregs->fip); | |
596 | supply_register (FDS_REGNUM, (char *) &xfpregs->fos); | |
597 | supply_register (FDOFF_REGNUM, (char *) &xfpregs->foo); | |
598 | ||
599 | /* Extract the code segment and opcode from the "fcs" member. */ | |
d4f3574e | 600 | { |
5c44784c JM |
601 | long l; |
602 | ||
603 | l = xfpregs->fcs & 0xffff; | |
604 | supply_register (FCS_REGNUM, (char *) &l); | |
605 | ||
606 | l = (xfpregs->fcs >> 16) & ((1 << 11) - 1); | |
607 | supply_register (FOP_REGNUM, (char *) &l); | |
d4f3574e | 608 | } |
5c44784c | 609 | } |
d4f3574e | 610 | |
5c44784c JM |
611 | /* Supply the SSE registers. */ |
612 | for (reg = 0; reg < 8; reg++) | |
613 | supply_register (XMM0_REGNUM + reg, (char *) &xfpregs->xmm_space[reg]); | |
614 | supply_register (MXCSR_REGNUM, (char *) &xfpregs->mxcsr); | |
d4f3574e SS |
615 | } |
616 | ||
04cd15b6 MK |
617 | /* Convert the valid floating-point and SSE registers in GDB's |
618 | register array to `struct user' format and store them in *XFPREGS. | |
619 | The array VALID indicates which registers are valid. If VALID is | |
620 | NULL, all registers are assumed to be valid. */ | |
d4f3574e | 621 | |
d4f3574e | 622 | static void |
5c44784c | 623 | convert_to_xfpregset (struct user_xfpregs_struct *xfpregs, |
5c44784c | 624 | signed char *valid) |
d4f3574e | 625 | { |
5c44784c | 626 | int reg; |
d4f3574e | 627 | |
5c44784c JM |
628 | /* Fill in the floating-point registers. */ |
629 | for (reg = 0; reg < 8; reg++) | |
630 | if (!valid || valid[reg]) | |
631 | memcpy (&xfpregs->st_space[reg], | |
632 | ®isters[REGISTER_BYTE (FP0_REGNUM + reg)], | |
633 | REGISTER_RAW_SIZE(FP0_REGNUM + reg)); | |
634 | ||
635 | #define fill(MEMBER, REGNO) \ | |
636 | if (! valid || valid[(REGNO)]) \ | |
637 | memcpy (&xfpregs->MEMBER, ®isters[REGISTER_BYTE (REGNO)], \ | |
638 | sizeof (xfpregs->MEMBER)) | |
639 | ||
640 | fill (cwd, FCTRL_REGNUM); | |
641 | fill (swd, FSTAT_REGNUM); | |
642 | fill (twd, FTAG_REGNUM); | |
643 | fill (fip, FCOFF_REGNUM); | |
644 | fill (foo, FDOFF_REGNUM); | |
645 | fill (fos, FDS_REGNUM); | |
646 | ||
647 | #undef fill | |
648 | ||
649 | if (! valid || valid[FCS_REGNUM]) | |
650 | xfpregs->fcs | |
651 | = ((xfpregs->fcs & ~0xffff) | |
652 | | (* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff)); | |
653 | ||
654 | if (! valid || valid[FOP_REGNUM]) | |
655 | xfpregs->fcs | |
656 | = ((xfpregs->fcs & 0xffff) | |
657 | | ((*(int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1)) | |
658 | << 16)); | |
659 | ||
660 | /* Fill in the XMM registers. */ | |
661 | for (reg = 0; reg < 8; reg++) | |
662 | if (! valid || valid[reg]) | |
663 | memcpy (&xfpregs->xmm_space[reg], | |
664 | ®isters[REGISTER_BYTE (XMM0_REGNUM + reg)], | |
665 | REGISTER_RAW_SIZE (XMM0_REGNUM + reg)); | |
666 | } | |
667 | ||
04cd15b6 MK |
668 | /* Fetch all registers covered by the PTRACE_SETXFPREGS request from |
669 | process/thread TID and store their values in GDB's register array. | |
670 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 671 | |
5c44784c | 672 | static int |
ed9a39eb | 673 | fetch_xfpregs (int tid) |
5c44784c | 674 | { |
5c44784c | 675 | struct user_xfpregs_struct xfpregs; |
04cd15b6 | 676 | int ret; |
5c44784c JM |
677 | |
678 | if (! have_ptrace_getxfpregs) | |
679 | return 0; | |
680 | ||
ed9a39eb | 681 | ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs); |
5c44784c | 682 | if (ret == -1) |
d4f3574e | 683 | { |
5c44784c JM |
684 | if (errno == EIO) |
685 | { | |
686 | have_ptrace_getxfpregs = 0; | |
687 | return 0; | |
688 | } | |
689 | ||
04cd15b6 | 690 | warning ("Couldn't read floating-point and SSE registers."); |
5c44784c | 691 | return 0; |
d4f3574e SS |
692 | } |
693 | ||
5c44784c JM |
694 | supply_xfpregset (&xfpregs); |
695 | return 1; | |
696 | } | |
d4f3574e | 697 | |
04cd15b6 MK |
698 | /* Store all valid registers in GDB's register array covered by the |
699 | PTRACE_SETXFPREGS request into the process/thread specified by TID. | |
700 | Return non-zero if successful, zero otherwise. */ | |
5c44784c | 701 | |
5c44784c | 702 | static int |
ed9a39eb | 703 | store_xfpregs (int tid) |
5c44784c | 704 | { |
5c44784c | 705 | struct user_xfpregs_struct xfpregs; |
04cd15b6 | 706 | int ret; |
5c44784c JM |
707 | |
708 | if (! have_ptrace_getxfpregs) | |
709 | return 0; | |
710 | ||
ed9a39eb | 711 | ret = ptrace (PTRACE_GETXFPREGS, tid, 0, &xfpregs); |
5c44784c | 712 | if (ret == -1) |
d4f3574e | 713 | { |
5c44784c JM |
714 | if (errno == EIO) |
715 | { | |
716 | have_ptrace_getxfpregs = 0; | |
717 | return 0; | |
718 | } | |
719 | ||
04cd15b6 | 720 | warning ("Couldn't read floating-point and SSE registers."); |
5c44784c JM |
721 | return 0; |
722 | } | |
723 | ||
04cd15b6 | 724 | convert_to_xfpregset (&xfpregs, register_valid); |
5c44784c | 725 | |
ed9a39eb | 726 | if (ptrace (PTRACE_SETXFPREGS, tid, 0, &xfpregs) < 0) |
5c44784c JM |
727 | { |
728 | warning ("Couldn't write floating-point and SSE registers."); | |
729 | return 0; | |
d4f3574e | 730 | } |
5c44784c JM |
731 | |
732 | return 1; | |
733 | } | |
734 | ||
04cd15b6 | 735 | /* Fill the XMM registers in the register array with dummy values. For |
5c44784c JM |
736 | cases where we don't have access to the XMM registers. I think |
737 | this is cleaner than printing a warning. For a cleaner solution, | |
738 | we should gdbarchify the i386 family. */ | |
04cd15b6 | 739 | |
5c44784c | 740 | static void |
04cd15b6 | 741 | dummy_sse_values (void) |
5c44784c JM |
742 | { |
743 | /* C doesn't have a syntax for NaN's, so write it out as an array of | |
744 | longs. */ | |
745 | static long dummy[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; | |
746 | static long mxcsr = 0x1f80; | |
747 | int reg; | |
748 | ||
749 | for (reg = 0; reg < 8; reg++) | |
750 | supply_register (XMM0_REGNUM + reg, (char *) dummy); | |
751 | supply_register (MXCSR_REGNUM, (char *) &mxcsr); | |
d4f3574e SS |
752 | } |
753 | ||
5c44784c JM |
754 | #else |
755 | ||
756 | /* Stub versions of the above routines, for systems that don't have | |
757 | PTRACE_GETXFPREGS. */ | |
ed9a39eb JM |
758 | static int store_xfpregs (int tid) { return 0; } |
759 | static int fetch_xfpregs (int tid) { return 0; } | |
04cd15b6 | 760 | static void dummy_sse_values (void) {} |
5c44784c JM |
761 | |
762 | #endif | |
763 | ||
764 | \f | |
765 | /* Transferring arbitrary registers between GDB and inferior. */ | |
d4f3574e | 766 | |
04cd15b6 MK |
767 | /* Fetch register REGNO from the child process. If REGNO is -1, do |
768 | this for all registers (including the floating point and SSE | |
769 | registers). */ | |
d4f3574e SS |
770 | |
771 | void | |
917317f4 | 772 | fetch_inferior_registers (int regno) |
d4f3574e | 773 | { |
ed9a39eb JM |
774 | int tid; |
775 | ||
f60300e7 MK |
776 | /* Use the old method of peeking around in `struct user' if the |
777 | GETREGS request isn't available. */ | |
778 | if (! have_ptrace_getregs) | |
779 | { | |
780 | old_fetch_inferior_registers (regno); | |
781 | return; | |
782 | } | |
783 | ||
04cd15b6 | 784 | /* Linux LWP ID's are process ID's. */ |
ed9a39eb | 785 | if ((tid = TIDGET (inferior_pid)) == 0) |
04cd15b6 | 786 | tid = inferior_pid; /* Not a threaded program. */ |
ed9a39eb | 787 | |
04cd15b6 MK |
788 | /* Use the PTRACE_GETXFPREGS request whenever possible, since it |
789 | transfers more registers in one system call, and we'll cache the | |
790 | results. But remember that fetch_xfpregs can fail, and return | |
791 | zero. */ | |
5c44784c JM |
792 | if (regno == -1) |
793 | { | |
ed9a39eb | 794 | fetch_regs (tid); |
f60300e7 MK |
795 | |
796 | /* The call above might reset `have_ptrace_getregs'. */ | |
797 | if (! have_ptrace_getregs) | |
798 | { | |
799 | old_fetch_inferior_registers (-1); | |
800 | return; | |
801 | } | |
802 | ||
ed9a39eb | 803 | if (fetch_xfpregs (tid)) |
5c44784c | 804 | return; |
ed9a39eb | 805 | fetch_fpregs (tid); |
5c44784c JM |
806 | return; |
807 | } | |
d4f3574e | 808 | |
5c44784c JM |
809 | if (GETREGS_SUPPLIES (regno)) |
810 | { | |
ed9a39eb | 811 | fetch_regs (tid); |
5c44784c JM |
812 | return; |
813 | } | |
814 | ||
815 | if (GETXFPREGS_SUPPLIES (regno)) | |
816 | { | |
ed9a39eb | 817 | if (fetch_xfpregs (tid)) |
5c44784c JM |
818 | return; |
819 | ||
820 | /* Either our processor or our kernel doesn't support the SSE | |
821 | registers, so read the FP registers in the traditional way, | |
822 | and fill the SSE registers with dummy values. It would be | |
823 | more graceful to handle differences in the register set using | |
824 | gdbarch. Until then, this will at least make things work | |
825 | plausibly. */ | |
ed9a39eb | 826 | fetch_fpregs (tid); |
5c44784c JM |
827 | dummy_sse_values (); |
828 | return; | |
829 | } | |
830 | ||
831 | internal_error ("i386-linux-nat.c (fetch_inferior_registers): " | |
832 | "got request for bad register number %d", regno); | |
d4f3574e SS |
833 | } |
834 | ||
04cd15b6 MK |
835 | /* Store register REGNO back into the child process. If REGNO is -1, |
836 | do this for all registers (including the floating point and SSE | |
837 | registers). */ | |
d4f3574e | 838 | void |
04cd15b6 | 839 | store_inferior_registers (int regno) |
d4f3574e | 840 | { |
ed9a39eb JM |
841 | int tid; |
842 | ||
f60300e7 MK |
843 | /* Use the old method of poking around in `struct user' if the |
844 | SETREGS request isn't available. */ | |
845 | if (! have_ptrace_getregs) | |
846 | { | |
847 | old_store_inferior_registers (regno); | |
848 | return; | |
849 | } | |
850 | ||
04cd15b6 | 851 | /* Linux LWP ID's are process ID's. */ |
ed9a39eb | 852 | if ((tid = TIDGET (inferior_pid)) == 0) |
04cd15b6 | 853 | tid = inferior_pid; /* Not a threaded program. */ |
ed9a39eb | 854 | |
04cd15b6 MK |
855 | /* Use the PTRACE_SETXFPREGS requests whenever possibl, since it |
856 | transfers more registers in one system call. But remember that | |
ed9a39eb | 857 | store_xfpregs can fail, and return zero. */ |
5c44784c JM |
858 | if (regno == -1) |
859 | { | |
ed9a39eb JM |
860 | store_regs (tid); |
861 | if (store_xfpregs (tid)) | |
5c44784c | 862 | return; |
ed9a39eb | 863 | store_fpregs (tid); |
5c44784c JM |
864 | return; |
865 | } | |
d4f3574e | 866 | |
5c44784c JM |
867 | if (GETREGS_SUPPLIES (regno)) |
868 | { | |
ed9a39eb | 869 | store_regs (tid); |
5c44784c JM |
870 | return; |
871 | } | |
872 | ||
873 | if (GETXFPREGS_SUPPLIES (regno)) | |
874 | { | |
ed9a39eb | 875 | if (store_xfpregs (tid)) |
5c44784c JM |
876 | return; |
877 | ||
878 | /* Either our processor or our kernel doesn't support the SSE | |
04cd15b6 MK |
879 | registers, so just write the FP registers in the traditional |
880 | way. */ | |
ed9a39eb | 881 | store_fpregs (tid); |
5c44784c JM |
882 | return; |
883 | } | |
884 | ||
04cd15b6 | 885 | internal_error ("Got request to store bad register number %d.", regno); |
d4f3574e SS |
886 | } |
887 | ||
de57eccd JM |
888 | \f |
889 | /* Interpreting register set info found in core files. */ | |
890 | ||
891 | /* Provide registers to GDB from a core file. | |
892 | ||
893 | (We can't use the generic version of this function in | |
894 | core-regset.c, because Linux has *three* different kinds of | |
895 | register set notes. core-regset.c would have to call | |
896 | supply_xfpregset, which most platforms don't have.) | |
897 | ||
898 | CORE_REG_SECT points to an array of bytes, which are the contents | |
899 | of a `note' from a core file which BFD thinks might contain | |
900 | register contents. CORE_REG_SIZE is its size. | |
901 | ||
902 | WHICH says which register set corelow suspects this is: | |
04cd15b6 MK |
903 | 0 --- the general-purpose register set, in elf_gregset_t format |
904 | 2 --- the floating-point register set, in elf_fpregset_t format | |
905 | 3 --- the extended floating-point register set, in struct | |
906 | user_xfpregs_struct format | |
907 | ||
908 | REG_ADDR isn't used on Linux. */ | |
de57eccd | 909 | |
de57eccd | 910 | static void |
04cd15b6 MK |
911 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
912 | int which, CORE_ADDR reg_addr) | |
de57eccd | 913 | { |
04cd15b6 MK |
914 | elf_gregset_t gregset; |
915 | elf_fpregset_t fpregset; | |
de57eccd JM |
916 | |
917 | switch (which) | |
918 | { | |
919 | case 0: | |
920 | if (core_reg_size != sizeof (gregset)) | |
04cd15b6 | 921 | warning ("Wrong size gregset in core file."); |
de57eccd JM |
922 | else |
923 | { | |
924 | memcpy (&gregset, core_reg_sect, sizeof (gregset)); | |
925 | supply_gregset (&gregset); | |
926 | } | |
927 | break; | |
928 | ||
929 | case 2: | |
930 | if (core_reg_size != sizeof (fpregset)) | |
04cd15b6 | 931 | warning ("Wrong size fpregset in core file."); |
de57eccd JM |
932 | else |
933 | { | |
934 | memcpy (&fpregset, core_reg_sect, sizeof (fpregset)); | |
935 | supply_fpregset (&fpregset); | |
936 | } | |
937 | break; | |
938 | ||
939 | #ifdef HAVE_PTRACE_GETXFPREGS | |
940 | { | |
941 | struct user_xfpregs_struct xfpregset; | |
04cd15b6 | 942 | |
de57eccd | 943 | case 3: |
04cd15b6 MK |
944 | if (core_reg_size != sizeof (xfpregset)) |
945 | warning ("Wrong size user_xfpregs_struct in core file."); | |
de57eccd JM |
946 | else |
947 | { | |
948 | memcpy (&xfpregset, core_reg_sect, sizeof (xfpregset)); | |
949 | supply_xfpregset (&xfpregset); | |
950 | } | |
951 | break; | |
952 | } | |
953 | #endif | |
954 | ||
955 | default: | |
956 | /* We've covered all the kinds of registers we know about here, | |
957 | so this must be something we wouldn't know what to do with | |
958 | anyway. Just ignore it. */ | |
959 | break; | |
960 | } | |
961 | } | |
962 | ||
a6abb2c0 MK |
963 | \f |
964 | /* The instruction for a Linux system call is: | |
965 | int $0x80 | |
966 | or 0xcd 0x80. */ | |
967 | ||
968 | static const unsigned char linux_syscall[] = { 0xcd, 0x80 }; | |
969 | ||
970 | #define LINUX_SYSCALL_LEN (sizeof linux_syscall) | |
971 | ||
972 | /* The system call number is stored in the %eax register. */ | |
973 | #define LINUX_SYSCALL_REGNUM 0 /* %eax */ | |
974 | ||
975 | /* We are specifically interested in the sigreturn and rt_sigreturn | |
976 | system calls. */ | |
977 | ||
978 | #ifndef SYS_sigreturn | |
979 | #define SYS_sigreturn 0x77 | |
980 | #endif | |
981 | #ifndef SYS_rt_sigreturn | |
982 | #define SYS_rt_sigreturn 0xad | |
983 | #endif | |
984 | ||
985 | /* Offset to saved processor flags, from <asm/sigcontext.h>. */ | |
986 | #define LINUX_SIGCONTEXT_EFLAGS_OFFSET (64) | |
987 | ||
988 | /* Resume execution of the inferior process. | |
989 | If STEP is nonzero, single-step it. | |
990 | If SIGNAL is nonzero, give it that signal. */ | |
991 | ||
992 | void | |
993 | child_resume (int pid, int step, enum target_signal signal) | |
994 | { | |
995 | int request = PTRACE_CONT; | |
996 | ||
997 | if (pid == -1) | |
998 | /* Resume all threads. */ | |
999 | /* I think this only gets used in the non-threaded case, where "resume | |
1000 | all threads" and "resume inferior_pid" are the same. */ | |
1001 | pid = inferior_pid; | |
1002 | ||
1003 | if (step) | |
1004 | { | |
1005 | CORE_ADDR pc = read_pc_pid (pid); | |
1006 | unsigned char buf[LINUX_SYSCALL_LEN]; | |
1007 | ||
1008 | request = PTRACE_SINGLESTEP; | |
1009 | ||
1010 | /* Returning from a signal trampoline is done by calling a | |
1011 | special system call (sigreturn or rt_sigreturn, see | |
1012 | i386-linux-tdep.c for more information). This system call | |
1013 | restores the registers that were saved when the signal was | |
1014 | raised, including %eflags. That means that single-stepping | |
1015 | won't work. Instead, we'll have to modify the signal context | |
1016 | that's about to be restored, and set the trace flag there. */ | |
1017 | ||
1018 | /* First check if PC is at a system call. */ | |
1019 | if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 | |
1020 | && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) | |
1021 | { | |
1022 | int syscall = read_register_pid (LINUX_SYSCALL_REGNUM, pid); | |
1023 | ||
1024 | /* Then check the system call number. */ | |
1025 | if (syscall == SYS_sigreturn || syscall == SYS_rt_sigreturn) | |
1026 | { | |
1027 | CORE_ADDR sp = read_register (SP_REGNUM); | |
1028 | CORE_ADDR addr = sp; | |
1029 | unsigned long int eflags; | |
1030 | ||
1031 | if (syscall == SYS_rt_sigreturn) | |
1032 | addr = read_memory_integer (sp + 8, 4) + 20; | |
1033 | ||
1034 | /* Set the trace flag in the context that's about to be | |
1035 | restored. */ | |
1036 | addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; | |
1037 | read_memory (addr, (char *) &eflags, 4); | |
1038 | eflags |= 0x0100; | |
1039 | write_memory (addr, (char *) &eflags, 4); | |
1040 | } | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) | |
1045 | perror_with_name ("ptrace"); | |
1046 | } | |
1047 | ||
5c44784c JM |
1048 | \f |
1049 | /* Calling functions in shared libraries. */ | |
04cd15b6 MK |
1050 | /* FIXME: kettenis/2000-03-05: Doesn't this belong in a |
1051 | target-dependent file? The function | |
1052 | `i386_linux_skip_solib_resolver' is mentioned in | |
1053 | `config/i386/tm-linux.h'. */ | |
5c44784c | 1054 | |
d4f3574e SS |
1055 | /* Find the minimal symbol named NAME, and return both the minsym |
1056 | struct and its objfile. This probably ought to be in minsym.c, but | |
1057 | everything there is trying to deal with things like C++ and | |
1058 | SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may | |
1059 | be considered too special-purpose for general consumption. */ | |
1060 | ||
1061 | static struct minimal_symbol * | |
1062 | find_minsym_and_objfile (char *name, struct objfile **objfile_p) | |
1063 | { | |
1064 | struct objfile *objfile; | |
1065 | ||
1066 | ALL_OBJFILES (objfile) | |
1067 | { | |
1068 | struct minimal_symbol *msym; | |
1069 | ||
1070 | ALL_OBJFILE_MSYMBOLS (objfile, msym) | |
1071 | { | |
1072 | if (SYMBOL_NAME (msym) | |
1073 | && STREQ (SYMBOL_NAME (msym), name)) | |
1074 | { | |
1075 | *objfile_p = objfile; | |
1076 | return msym; | |
1077 | } | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | ||
1085 | static CORE_ADDR | |
1086 | skip_hurd_resolver (CORE_ADDR pc) | |
1087 | { | |
1088 | /* The HURD dynamic linker is part of the GNU C library, so many | |
1089 | GNU/Linux distributions use it. (All ELF versions, as far as I | |
1090 | know.) An unresolved PLT entry points to "_dl_runtime_resolve", | |
1091 | which calls "fixup" to patch the PLT, and then passes control to | |
1092 | the function. | |
1093 | ||
1094 | We look for the symbol `_dl_runtime_resolve', and find `fixup' in | |
1095 | the same objfile. If we are at the entry point of `fixup', then | |
1096 | we set a breakpoint at the return address (at the top of the | |
1097 | stack), and continue. | |
1098 | ||
1099 | It's kind of gross to do all these checks every time we're | |
1100 | called, since they don't change once the executable has gotten | |
1101 | started. But this is only a temporary hack --- upcoming versions | |
1102 | of Linux will provide a portable, efficient interface for | |
1103 | debugging programs that use shared libraries. */ | |
1104 | ||
1105 | struct objfile *objfile; | |
1106 | struct minimal_symbol *resolver | |
1107 | = find_minsym_and_objfile ("_dl_runtime_resolve", &objfile); | |
1108 | ||
1109 | if (resolver) | |
1110 | { | |
1111 | struct minimal_symbol *fixup | |
1112 | = lookup_minimal_symbol ("fixup", 0, objfile); | |
1113 | ||
1114 | if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc) | |
1115 | return (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
1116 | } | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
d4f3574e SS |
1121 | /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c. |
1122 | This function: | |
1123 | 1) decides whether a PLT has sent us into the linker to resolve | |
1124 | a function reference, and | |
1125 | 2) if so, tells us where to set a temporary breakpoint that will | |
1126 | trigger when the dynamic linker is done. */ | |
1127 | ||
1128 | CORE_ADDR | |
1129 | i386_linux_skip_solib_resolver (CORE_ADDR pc) | |
1130 | { | |
1131 | CORE_ADDR result; | |
1132 | ||
1133 | /* Plug in functions for other kinds of resolvers here. */ | |
1134 | result = skip_hurd_resolver (pc); | |
1135 | if (result) | |
1136 | return result; | |
1137 | ||
1138 | return 0; | |
1139 | } | |
de57eccd | 1140 | |
de57eccd | 1141 | \f |
04cd15b6 MK |
1142 | /* Register that we are able to handle Linux ELF core file formats. */ |
1143 | ||
1144 | static struct core_fns linux_elf_core_fns = | |
1145 | { | |
1146 | bfd_target_elf_flavour, /* core_flavour */ | |
1147 | default_check_format, /* check_format */ | |
1148 | default_core_sniffer, /* core_sniffer */ | |
1149 | fetch_core_registers, /* core_read_registers */ | |
1150 | NULL /* next */ | |
1151 | }; | |
de57eccd JM |
1152 | |
1153 | void | |
1154 | _initialize_i386_linux_nat () | |
1155 | { | |
04cd15b6 | 1156 | add_core_fns (&linux_elf_core_fns); |
de57eccd | 1157 | } |