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