Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Low level interface to ptrace, for the remote server for GDB. |
2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include <sys/wait.h> | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | ||
26 | #include <stdio.h> | |
27 | #include <sys/param.h> | |
28 | #include <sys/dir.h> | |
5c44784c | 29 | #include <sys/ptrace.h> |
c906108c SS |
30 | #include <sys/user.h> |
31 | #include <signal.h> | |
32 | #include <sys/ioctl.h> | |
c906108c SS |
33 | #include <fcntl.h> |
34 | ||
35 | /***************Begin MY defs*********************/ | |
36 | int quit_flag = 0; | |
5c44784c JM |
37 | static char my_registers[REGISTER_BYTES]; |
38 | char *registers = my_registers; | |
c906108c SS |
39 | |
40 | /* Index within `registers' of the first byte of the space for | |
41 | register N. */ | |
42 | ||
43 | ||
44 | char buf2[MAX_REGISTER_RAW_SIZE]; | |
45 | /***************End MY defs*********************/ | |
46 | ||
5c44784c | 47 | #ifdef HAVE_SYS_REG_H |
c906108c SS |
48 | #include <sys/reg.h> |
49 | #endif | |
50 | ||
5c44784c JM |
51 | /* Default the type of the ptrace transfer to int. */ |
52 | #ifndef PTRACE_XFER_TYPE | |
53 | #define PTRACE_XFER_TYPE int | |
54 | #endif | |
55 | ||
c906108c SS |
56 | extern char **environ; |
57 | extern int errno; | |
58 | extern int inferior_pid; | |
59 | void quit (), perror_with_name (); | |
60 | int query (); | |
61 | ||
62 | /* Start an inferior process and returns its pid. | |
63 | ALLARGS is a vector of program-name and args. | |
64 | ENV is the environment vector to pass. */ | |
65 | ||
66 | int | |
67 | create_inferior (program, allargs) | |
68 | char *program; | |
69 | char **allargs; | |
70 | { | |
71 | int pid; | |
72 | ||
73 | pid = fork (); | |
74 | if (pid < 0) | |
75 | perror_with_name ("fork"); | |
76 | ||
77 | if (pid == 0) | |
78 | { | |
79 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
80 | ||
81 | execv (program, allargs); | |
82 | ||
83 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
84 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); | |
85 | fflush (stderr); | |
86 | _exit (0177); | |
87 | } | |
88 | ||
89 | return pid; | |
90 | } | |
91 | ||
92 | /* Kill the inferior process. Make us have no inferior. */ | |
93 | ||
94 | void | |
95 | kill_inferior () | |
96 | { | |
97 | if (inferior_pid == 0) | |
98 | return; | |
99 | ptrace (PTRACE_KILL, inferior_pid, 0, 0); | |
100 | wait (0); | |
c5aa993b | 101 | /*************inferior_died ();****VK**************/ |
c906108c SS |
102 | } |
103 | ||
104 | /* Return nonzero if the given thread is still alive. */ | |
105 | int | |
106 | mythread_alive (pid) | |
107 | int pid; | |
108 | { | |
109 | return 1; | |
110 | } | |
111 | ||
112 | /* Wait for process, returns status */ | |
113 | ||
114 | unsigned char | |
115 | mywait (status) | |
116 | char *status; | |
117 | { | |
118 | int pid; | |
119 | union wait w; | |
120 | ||
121 | pid = wait (&w); | |
122 | if (pid != inferior_pid) | |
123 | perror_with_name ("wait"); | |
124 | ||
125 | if (WIFEXITED (w)) | |
126 | { | |
127 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
128 | *status = 'W'; | |
129 | return ((unsigned char) WEXITSTATUS (w)); | |
130 | } | |
131 | else if (!WIFSTOPPED (w)) | |
132 | { | |
133 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
134 | *status = 'X'; | |
135 | return ((unsigned char) WTERMSIG (w)); | |
136 | } | |
137 | ||
138 | fetch_inferior_registers (0); | |
139 | ||
140 | *status = 'T'; | |
141 | return ((unsigned char) WSTOPSIG (w)); | |
142 | } | |
143 | ||
144 | /* Resume execution of the inferior process. | |
145 | If STEP is nonzero, single-step it. | |
146 | If SIGNAL is nonzero, give it that signal. */ | |
147 | ||
148 | void | |
149 | myresume (step, signal) | |
150 | int step; | |
151 | int signal; | |
152 | { | |
153 | errno = 0; | |
154 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
155 | if (errno) | |
156 | perror_with_name ("ptrace"); | |
157 | } | |
158 | ||
159 | ||
160 | #if !defined (offsetof) | |
161 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
162 | #endif | |
163 | ||
164 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
165 | #if !defined (U_REGS_OFFSET) | |
166 | #define U_REGS_OFFSET \ | |
167 | ptrace (PT_READ_U, inferior_pid, \ | |
168 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ | |
169 | - KERNEL_U_ADDR | |
170 | #endif | |
171 | ||
5c44784c JM |
172 | #ifdef I386_GNULINUX_TARGET |
173 | /* i386_register_raw_size[i] is the number of bytes of storage in the | |
174 | actual machine representation for register i. */ | |
175 | int i386_register_raw_size[MAX_NUM_REGS] = { | |
176 | 4, 4, 4, 4, | |
177 | 4, 4, 4, 4, | |
178 | 4, 4, 4, 4, | |
179 | 4, 4, 4, 4, | |
180 | 10, 10, 10, 10, | |
181 | 10, 10, 10, 10, | |
182 | 4, 4, 4, 4, | |
183 | 4, 4, 4, 4, | |
184 | 16, 16, 16, 16, | |
185 | 16, 16, 16, 16, | |
186 | 4 | |
187 | }; | |
188 | ||
189 | int i386_register_byte[MAX_NUM_REGS]; | |
190 | ||
191 | static void | |
192 | initialize_arch() | |
193 | { | |
194 | /* Initialize the table saying where each register starts in the | |
195 | register file. */ | |
196 | { | |
197 | int i, offset; | |
198 | ||
199 | offset = 0; | |
200 | for (i = 0; i < MAX_NUM_REGS; i++) | |
201 | { | |
202 | i386_register_byte[i] = offset; | |
203 | offset += i386_register_raw_size[i]; | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
c906108c SS |
208 | /* this table must line up with REGISTER_NAMES in tm-i386v.h */ |
209 | /* symbols like 'EAX' come from <sys/reg.h> */ | |
c5aa993b | 210 | static int regmap[] = |
c906108c SS |
211 | { |
212 | EAX, ECX, EDX, EBX, | |
213 | UESP, EBP, ESI, EDI, | |
214 | EIP, EFL, CS, SS, | |
215 | DS, ES, FS, GS, | |
216 | }; | |
217 | ||
218 | int | |
219 | i386_register_u_addr (blockend, regnum) | |
220 | int blockend; | |
221 | int regnum; | |
222 | { | |
223 | #if 0 | |
224 | /* this will be needed if fp registers are reinstated */ | |
225 | /* for now, you can look at them with 'info float' | |
226 | * sys5 wont let you change them with ptrace anyway | |
227 | */ | |
c5aa993b | 228 | if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) |
c906108c SS |
229 | { |
230 | int ubase, fpstate; | |
231 | struct user u; | |
232 | ubase = blockend + 4 * (SS + 1) - KSTKSZ; | |
c5aa993b | 233 | fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u); |
c906108c | 234 | return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); |
c5aa993b | 235 | } |
c906108c SS |
236 | else |
237 | #endif | |
238 | return (blockend + 4 * regmap[regnum]); | |
c5aa993b | 239 | |
c906108c | 240 | } |
5c44784c JM |
241 | #elif defined(TARGET_M68K) |
242 | static void | |
243 | initialize_arch() | |
244 | { | |
245 | return; | |
246 | } | |
247 | ||
c906108c | 248 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ |
c5aa993b | 249 | static int regmap[] = |
c906108c SS |
250 | { |
251 | #ifdef PT_D0 | |
252 | PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, | |
253 | PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, | |
254 | PT_SR, PT_PC, | |
255 | #else | |
256 | 14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, | |
257 | 17, 18, | |
258 | #endif | |
259 | #ifdef PT_FP0 | |
260 | PT_FP0, PT_FP1, PT_FP2, PT_FP3, PT_FP4, PT_FP5, PT_FP6, PT_FP7, | |
261 | PT_FPCR, PT_FPSR, PT_FPIAR | |
262 | #else | |
263 | 21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47 | |
264 | #endif | |
265 | }; | |
266 | ||
267 | /* BLOCKEND is the value of u.u_ar0, and points to the place where GS | |
268 | is stored. */ | |
269 | ||
270 | int | |
271 | m68k_linux_register_u_addr (blockend, regnum) | |
272 | int blockend; | |
273 | int regnum; | |
274 | { | |
c5aa993b | 275 | return (blockend + 4 * regmap[regnum]); |
c906108c SS |
276 | } |
277 | #endif | |
278 | ||
279 | CORE_ADDR | |
280 | register_addr (regno, blockend) | |
281 | int regno; | |
282 | CORE_ADDR blockend; | |
283 | { | |
284 | CORE_ADDR addr; | |
285 | ||
286 | if (regno < 0 || regno >= ARCH_NUM_REGS) | |
287 | error ("Invalid register number %d.", regno); | |
288 | ||
289 | REGISTER_U_ADDR (addr, blockend, regno); | |
290 | ||
291 | return addr; | |
292 | } | |
293 | ||
294 | /* Fetch one register. */ | |
295 | ||
296 | static void | |
297 | fetch_register (regno) | |
298 | int regno; | |
299 | { | |
5c44784c | 300 | CORE_ADDR regaddr; |
c906108c SS |
301 | register int i; |
302 | ||
303 | /* Offset of registers within the u area. */ | |
304 | unsigned int offset; | |
305 | ||
306 | offset = U_REGS_OFFSET; | |
307 | ||
308 | regaddr = register_addr (regno, offset); | |
5c44784c | 309 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
c906108c SS |
310 | { |
311 | errno = 0; | |
5c44784c JM |
312 | *(PTRACE_XFER_TYPE *) ®isters[REGISTER_BYTE (regno) + i] = |
313 | ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0); | |
314 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
c906108c SS |
315 | if (errno != 0) |
316 | { | |
317 | /* Warning, not error, in case we are attached; sometimes the | |
318 | kernel doesn't let us at the registers. */ | |
319 | char *err = strerror (errno); | |
320 | char *msg = alloca (strlen (err) + 128); | |
321 | sprintf (msg, "reading register %d: %s", regno, err); | |
322 | error (msg); | |
323 | goto error_exit; | |
324 | } | |
325 | } | |
c5aa993b | 326 | error_exit:; |
c906108c SS |
327 | } |
328 | ||
329 | /* Fetch all registers, or just one, from the child process. */ | |
330 | ||
331 | void | |
332 | fetch_inferior_registers (regno) | |
333 | int regno; | |
334 | { | |
335 | if (regno == -1 || regno == 0) | |
c5aa993b | 336 | for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++) |
c906108c SS |
337 | fetch_register (regno); |
338 | else | |
339 | fetch_register (regno); | |
340 | } | |
341 | ||
342 | /* Store our register values back into the inferior. | |
343 | If REGNO is -1, do this for all registers. | |
344 | Otherwise, REGNO specifies which register (so we can save time). */ | |
345 | ||
346 | void | |
347 | store_inferior_registers (regno) | |
348 | int regno; | |
349 | { | |
5c44784c JM |
350 | CORE_ADDR regaddr; |
351 | int i; | |
c906108c SS |
352 | unsigned int offset = U_REGS_OFFSET; |
353 | ||
354 | if (regno >= 0) | |
355 | { | |
356 | #if 0 | |
357 | if (CANNOT_STORE_REGISTER (regno)) | |
358 | return; | |
359 | #endif | |
360 | regaddr = register_addr (regno, offset); | |
361 | errno = 0; | |
362 | #if 0 | |
363 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
c5aa993b JM |
364 | { |
365 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; | |
366 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
367 | scratch, 0); | |
368 | if (errno != 0) | |
369 | { | |
c906108c | 370 | /* Error, even if attached. Failing to write these two |
c5aa993b JM |
371 | registers is pretty serious. */ |
372 | sprintf (buf, "writing register number %d", regno); | |
373 | perror_with_name (buf); | |
374 | } | |
375 | } | |
c906108c SS |
376 | else |
377 | #endif | |
c5aa993b | 378 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
c906108c SS |
379 | { |
380 | errno = 0; | |
5c44784c | 381 | ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
c906108c SS |
382 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
383 | if (errno != 0) | |
384 | { | |
385 | /* Warning, not error, in case we are attached; sometimes the | |
386 | kernel doesn't let us at the registers. */ | |
387 | char *err = strerror (errno); | |
388 | char *msg = alloca (strlen (err) + 128); | |
389 | sprintf (msg, "writing register %d: %s", | |
390 | regno, err); | |
391 | error (msg); | |
392 | return; | |
393 | } | |
c5aa993b | 394 | regaddr += sizeof (int); |
c906108c SS |
395 | } |
396 | } | |
397 | else | |
c5aa993b | 398 | for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++) |
c906108c SS |
399 | store_inferior_registers (regno); |
400 | } | |
401 | ||
402 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
403 | in the NEW_SUN_PTRACE case. | |
404 | It ought to be straightforward. But it appears that writing did | |
405 | not write the data that I specified. I cannot understand where | |
406 | it got the data that it actually did write. */ | |
407 | ||
408 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
409 | to debugger memory starting at MYADDR. */ | |
410 | ||
411 | void | |
412 | read_inferior_memory (memaddr, myaddr, len) | |
413 | CORE_ADDR memaddr; | |
414 | char *myaddr; | |
415 | int len; | |
416 | { | |
417 | register int i; | |
418 | /* Round starting address down to longword boundary. */ | |
5c44784c | 419 | register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE); |
c906108c | 420 | /* Round ending address up; get number of longwords that makes. */ |
5c44784c JM |
421 | register int count |
422 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
423 | / sizeof (PTRACE_XFER_TYPE); | |
c906108c | 424 | /* Allocate buffer of that many longwords. */ |
5c44784c JM |
425 | register PTRACE_XFER_TYPE *buffer |
426 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
c906108c SS |
427 | |
428 | /* Read all the longwords */ | |
5c44784c | 429 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
c906108c SS |
430 | { |
431 | buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); | |
432 | } | |
433 | ||
434 | /* Copy appropriate bytes out of the buffer. */ | |
5c44784c | 435 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len); |
c906108c SS |
436 | } |
437 | ||
438 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
439 | to inferior's memory at MEMADDR. | |
440 | On failure (cannot write the inferior) | |
441 | returns the value of errno. */ | |
442 | ||
443 | int | |
444 | write_inferior_memory (memaddr, myaddr, len) | |
445 | CORE_ADDR memaddr; | |
446 | char *myaddr; | |
447 | int len; | |
448 | { | |
449 | register int i; | |
450 | /* Round starting address down to longword boundary. */ | |
5c44784c | 451 | register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE); |
c906108c SS |
452 | /* Round ending address up; get number of longwords that makes. */ |
453 | register int count | |
5c44784c | 454 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); |
c906108c | 455 | /* Allocate buffer of that many longwords. */ |
5c44784c | 456 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
c906108c SS |
457 | extern int errno; |
458 | ||
459 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
460 | ||
461 | buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); | |
462 | ||
463 | if (count > 1) | |
464 | { | |
465 | buffer[count - 1] | |
466 | = ptrace (PTRACE_PEEKTEXT, inferior_pid, | |
5c44784c | 467 | addr + (count - 1) * sizeof (PTRACE_XFER_TYPE), 0); |
c906108c SS |
468 | } |
469 | ||
470 | /* Copy data to be written over corresponding part of buffer */ | |
471 | ||
5c44784c | 472 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); |
c906108c SS |
473 | |
474 | /* Write the entire buffer. */ | |
475 | ||
5c44784c | 476 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
c906108c SS |
477 | { |
478 | errno = 0; | |
479 | ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]); | |
480 | if (errno) | |
481 | return errno; | |
482 | } | |
483 | ||
484 | return 0; | |
485 | } | |
486 | \f | |
487 | void | |
4ce44c66 | 488 | initialize_low () |
c906108c | 489 | { |
5c44784c | 490 | initialize_arch(); |
c906108c | 491 | } |