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d6e9fb05 JK |
1 | /* Low level interface to ptrace, for the remote server for GDB. |
2 | Copyright (C) 1986, 1987, 1993, 2000 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include <sys/types.h> | |
22 | #include <sys/wait.h> | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | ||
26 | #include <stdio.h> | |
27 | #include <errno.h> | |
28 | ||
29 | /***************Begin MY defs*********************/ | |
30 | int quit_flag = 0; | |
31 | static char my_registers[REGISTER_BYTES]; | |
32 | char *registers = my_registers; | |
33 | ||
34 | /* Index within `registers' of the first byte of the space for | |
35 | register N. */ | |
36 | ||
37 | char buf2[MAX_REGISTER_RAW_SIZE]; | |
38 | /***************End MY defs*********************/ | |
39 | ||
40 | #include <sys/ptrace.h> | |
41 | #include <machine/reg.h> | |
42 | ||
43 | extern int sys_nerr; | |
44 | // extern char **sys_errlist; | |
45 | extern char **environ; | |
46 | extern int inferior_pid; | |
47 | void quit (), perror_with_name (); | |
48 | ||
9cebe72f C |
49 | #define RF(dst, src) \ |
50 | memcpy(®isters[REGISTER_BYTE(dst)], &src, sizeof(src)) | |
51 | ||
52 | #define RS(src, dst) \ | |
53 | memcpy(&dst, ®isters[REGISTER_BYTE(src)], sizeof(dst)) | |
54 | ||
55 | #ifdef __i386__ | |
56 | struct env387 | |
57 | { | |
58 | unsigned short control; | |
59 | unsigned short r0; | |
60 | unsigned short status; | |
61 | unsigned short r1; | |
62 | unsigned short tag; | |
63 | unsigned short r2; | |
64 | unsigned long eip; | |
65 | unsigned short code_seg; | |
66 | unsigned short opcode; | |
67 | unsigned long operand; | |
68 | unsigned short operand_seg; | |
69 | unsigned short r3; | |
70 | unsigned char regs[8][10]; | |
71 | }; | |
72 | ||
d6e9fb05 JK |
73 | /* i386_register_raw_size[i] is the number of bytes of storage in the |
74 | actual machine representation for register i. */ | |
75 | int i386_register_raw_size[MAX_NUM_REGS] = { | |
76 | 4, 4, 4, 4, | |
77 | 4, 4, 4, 4, | |
78 | 4, 4, 4, 4, | |
79 | 4, 4, 4, 4, | |
80 | 10, 10, 10, 10, | |
81 | 10, 10, 10, 10, | |
82 | 4, 4, 4, 4, | |
83 | 4, 4, 4, 4, | |
84 | 16, 16, 16, 16, | |
85 | 16, 16, 16, 16, | |
86 | 4 | |
87 | }; | |
88 | ||
89 | int i386_register_byte[MAX_NUM_REGS]; | |
90 | ||
91 | static void | |
fba45db2 | 92 | initialize_arch (void) |
d6e9fb05 JK |
93 | { |
94 | /* Initialize the table saying where each register starts in the | |
95 | register file. */ | |
96 | { | |
97 | int i, offset; | |
98 | ||
99 | offset = 0; | |
100 | for (i = 0; i < MAX_NUM_REGS; i++) | |
101 | { | |
102 | i386_register_byte[i] = offset; | |
103 | offset += i386_register_raw_size[i]; | |
104 | } | |
105 | } | |
106 | } | |
9cebe72f | 107 | #endif /* !__i386__ */ |
d6e9fb05 | 108 | |
9cebe72f | 109 | #ifdef __powerpc__ |
22c72081 C |
110 | #include "ppc-tdep.h" |
111 | ||
9cebe72f | 112 | static void |
fba45db2 | 113 | initialize_arch (void) |
9cebe72f C |
114 | { |
115 | } | |
116 | #endif /* !__powerpc__ */ | |
d6e9fb05 JK |
117 | |
118 | ||
119 | /* Start an inferior process and returns its pid. | |
120 | ALLARGS is a vector of program-name and args. | |
121 | ENV is the environment vector to pass. */ | |
122 | ||
123 | int | |
fba45db2 | 124 | create_inferior (char *program, char **allargs) |
d6e9fb05 JK |
125 | { |
126 | int pid; | |
127 | ||
128 | pid = fork (); | |
129 | if (pid < 0) | |
130 | perror_with_name ("fork"); | |
131 | ||
132 | if (pid == 0) | |
133 | { | |
134 | ptrace (PT_TRACE_ME, 0, 0, 0); | |
135 | ||
136 | execv (program, allargs); | |
137 | ||
138 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
139 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); | |
140 | fflush (stderr); | |
141 | _exit (0177); | |
142 | } | |
143 | ||
144 | return pid; | |
145 | } | |
146 | ||
147 | /* Kill the inferior process. Make us have no inferior. */ | |
148 | ||
149 | void | |
fba45db2 | 150 | kill_inferior (void) |
d6e9fb05 JK |
151 | { |
152 | if (inferior_pid == 0) | |
153 | return; | |
154 | ptrace (PT_KILL, inferior_pid, 0, 0); | |
155 | wait (0); | |
156 | /*************inferior_died ();****VK**************/ | |
157 | } | |
158 | ||
159 | /* Return nonzero if the given thread is still alive. */ | |
160 | int | |
fba45db2 | 161 | mythread_alive (int pid) |
d6e9fb05 JK |
162 | { |
163 | return 1; | |
164 | } | |
165 | ||
166 | /* Wait for process, returns status */ | |
167 | ||
168 | unsigned char | |
fba45db2 | 169 | mywait (char *status) |
d6e9fb05 JK |
170 | { |
171 | int pid; | |
172 | int w; | |
173 | ||
174 | pid = wait (&w); | |
175 | if (pid != inferior_pid) | |
176 | perror_with_name ("wait"); | |
177 | ||
178 | if (WIFEXITED (w)) | |
179 | { | |
180 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
181 | *status = 'W'; | |
182 | return ((unsigned char) WEXITSTATUS (w)); | |
183 | } | |
184 | else if (!WIFSTOPPED (w)) | |
185 | { | |
186 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
187 | *status = 'X'; | |
188 | return ((unsigned char) WTERMSIG (w)); | |
189 | } | |
190 | ||
191 | fetch_inferior_registers (0); | |
192 | ||
193 | *status = 'T'; | |
194 | return ((unsigned char) WSTOPSIG (w)); | |
195 | } | |
196 | ||
197 | /* Resume execution of the inferior process. | |
198 | If STEP is nonzero, single-step it. | |
199 | If SIGNAL is nonzero, give it that signal. */ | |
200 | ||
201 | void | |
fba45db2 | 202 | myresume (int step, int signal) |
d6e9fb05 JK |
203 | { |
204 | errno = 0; | |
205 | ptrace (step ? PT_STEP : PT_CONTINUE, inferior_pid, | |
206 | (PTRACE_ARG3_TYPE) 1, signal); | |
207 | if (errno) | |
208 | perror_with_name ("ptrace"); | |
209 | } | |
210 | ||
9cebe72f C |
211 | |
212 | #ifdef __i386__ | |
d6e9fb05 JK |
213 | /* Fetch one or more registers from the inferior. REGNO == -1 to get |
214 | them all. We actually fetch more than requested, when convenient, | |
215 | marking them as valid so we won't fetch them again. */ | |
216 | ||
217 | void | |
fba45db2 | 218 | fetch_inferior_registers (int ignored) |
d6e9fb05 JK |
219 | { |
220 | struct reg inferior_registers; | |
9cebe72f | 221 | struct env387 inferior_fp_registers; |
d6e9fb05 JK |
222 | |
223 | ptrace (PT_GETREGS, inferior_pid, | |
224 | (PTRACE_ARG3_TYPE) &inferior_registers, 0); | |
d6e9fb05 JK |
225 | ptrace (PT_GETFPREGS, inferior_pid, |
226 | (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0); | |
9cebe72f C |
227 | |
228 | RF ( 0, inferior_registers.r_eax); | |
229 | RF ( 1, inferior_registers.r_ecx); | |
230 | RF ( 2, inferior_registers.r_edx); | |
231 | RF ( 3, inferior_registers.r_ebx); | |
232 | RF ( 4, inferior_registers.r_esp); | |
233 | RF ( 5, inferior_registers.r_ebp); | |
234 | RF ( 6, inferior_registers.r_esi); | |
235 | RF ( 7, inferior_registers.r_edi); | |
236 | RF ( 8, inferior_registers.r_eip); | |
237 | RF ( 9, inferior_registers.r_eflags); | |
238 | RF (10, inferior_registers.r_cs); | |
239 | RF (11, inferior_registers.r_ss); | |
240 | RF (12, inferior_registers.r_ds); | |
241 | RF (13, inferior_registers.r_es); | |
242 | RF (14, inferior_registers.r_fs); | |
243 | RF (15, inferior_registers.r_gs); | |
244 | ||
0c9f8a69 C |
245 | RF (FP0_REGNUM, inferior_fp_registers.regs[0]); |
246 | RF (FP0_REGNUM + 1, inferior_fp_registers.regs[1]); | |
247 | RF (FP0_REGNUM + 2, inferior_fp_registers.regs[2]); | |
248 | RF (FP0_REGNUM + 3, inferior_fp_registers.regs[3]); | |
249 | RF (FP0_REGNUM + 4, inferior_fp_registers.regs[4]); | |
250 | RF (FP0_REGNUM + 5, inferior_fp_registers.regs[5]); | |
251 | RF (FP0_REGNUM + 6, inferior_fp_registers.regs[6]); | |
252 | RF (FP0_REGNUM + 7, inferior_fp_registers.regs[7]); | |
9cebe72f | 253 | |
0c9f8a69 C |
254 | RF (FCTRL_REGNUM, inferior_fp_registers.control); |
255 | RF (FSTAT_REGNUM, inferior_fp_registers.status); | |
256 | RF (FTAG_REGNUM, inferior_fp_registers.tag); | |
257 | RF (FCS_REGNUM, inferior_fp_registers.code_seg); | |
258 | RF (FCOFF_REGNUM, inferior_fp_registers.eip); | |
259 | RF (FDS_REGNUM, inferior_fp_registers.operand_seg); | |
260 | RF (FDOFF_REGNUM, inferior_fp_registers.operand); | |
261 | RF (FOP_REGNUM, inferior_fp_registers.opcode); | |
d6e9fb05 JK |
262 | } |
263 | ||
264 | /* Store our register values back into the inferior. | |
265 | If REGNO is -1, do this for all registers. | |
266 | Otherwise, REGNO specifies which register (so we can save time). */ | |
267 | ||
268 | void | |
fba45db2 | 269 | store_inferior_registers (int ignored) |
d6e9fb05 JK |
270 | { |
271 | struct reg inferior_registers; | |
9cebe72f C |
272 | struct env387 inferior_fp_registers; |
273 | ||
274 | RS ( 0, inferior_registers.r_eax); | |
275 | RS ( 1, inferior_registers.r_ecx); | |
276 | RS ( 2, inferior_registers.r_edx); | |
277 | RS ( 3, inferior_registers.r_ebx); | |
278 | RS ( 4, inferior_registers.r_esp); | |
279 | RS ( 5, inferior_registers.r_ebp); | |
280 | RS ( 6, inferior_registers.r_esi); | |
281 | RS ( 7, inferior_registers.r_edi); | |
282 | RS ( 8, inferior_registers.r_eip); | |
283 | RS ( 9, inferior_registers.r_eflags); | |
284 | RS (10, inferior_registers.r_cs); | |
285 | RS (11, inferior_registers.r_ss); | |
286 | RS (12, inferior_registers.r_ds); | |
287 | RS (13, inferior_registers.r_es); | |
288 | RS (14, inferior_registers.r_fs); | |
289 | RS (15, inferior_registers.r_gs); | |
290 | ||
0c9f8a69 C |
291 | RS (FP0_REGNUM, inferior_fp_registers.regs[0]); |
292 | RS (FP0_REGNUM + 1, inferior_fp_registers.regs[1]); | |
293 | RS (FP0_REGNUM + 2, inferior_fp_registers.regs[2]); | |
294 | RS (FP0_REGNUM + 3, inferior_fp_registers.regs[3]); | |
295 | RS (FP0_REGNUM + 4, inferior_fp_registers.regs[4]); | |
296 | RS (FP0_REGNUM + 5, inferior_fp_registers.regs[5]); | |
297 | RS (FP0_REGNUM + 6, inferior_fp_registers.regs[6]); | |
298 | RS (FP0_REGNUM + 7, inferior_fp_registers.regs[7]); | |
9cebe72f | 299 | |
0c9f8a69 C |
300 | RS (FCTRL_REGNUM, inferior_fp_registers.control); |
301 | RS (FSTAT_REGNUM, inferior_fp_registers.status); | |
302 | RS (FTAG_REGNUM, inferior_fp_registers.tag); | |
303 | RS (FCS_REGNUM, inferior_fp_registers.code_seg); | |
304 | RS (FCOFF_REGNUM, inferior_fp_registers.eip); | |
305 | RS (FDS_REGNUM, inferior_fp_registers.operand_seg); | |
306 | RS (FDOFF_REGNUM, inferior_fp_registers.operand); | |
307 | RS (FOP_REGNUM, inferior_fp_registers.opcode); | |
d6e9fb05 | 308 | |
d6e9fb05 JK |
309 | ptrace (PT_SETREGS, inferior_pid, |
310 | (PTRACE_ARG3_TYPE) &inferior_registers, 0); | |
d6e9fb05 JK |
311 | ptrace (PT_SETFPREGS, inferior_pid, |
312 | (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0); | |
d6e9fb05 | 313 | } |
9cebe72f C |
314 | #endif /* !__i386__ */ |
315 | ||
316 | #ifdef __powerpc__ | |
317 | /* Fetch one or more registers from the inferior. REGNO == -1 to get | |
318 | them all. We actually fetch more than requested, when convenient, | |
319 | marking them as valid so we won't fetch them again. */ | |
320 | ||
321 | void | |
fba45db2 | 322 | fetch_inferior_registers (int regno) |
9cebe72f C |
323 | { |
324 | struct reg inferior_registers; | |
22c72081 | 325 | #ifdef PT_GETFPREGS |
9cebe72f | 326 | struct fpreg inferior_fp_registers; |
22c72081 | 327 | #endif |
9cebe72f C |
328 | int i; |
329 | ||
330 | ptrace (PT_GETREGS, inferior_pid, | |
331 | (PTRACE_ARG3_TYPE) & inferior_registers, 0); | |
9cebe72f C |
332 | for (i = 0; i < 32; i++) |
333 | RF (i, inferior_registers.fixreg[i]); | |
22c72081 C |
334 | RF (PPC_LR_REGNUM, inferior_registers.lr); |
335 | RF (PPC_CR_REGNUM, inferior_registers.cr); | |
336 | RF (PPC_XER_REGNUM, inferior_registers.xer); | |
337 | RF (PPC_CTR_REGNUM, inferior_registers.ctr); | |
9cebe72f C |
338 | RF (PC_REGNUM, inferior_registers.pc); |
339 | ||
22c72081 C |
340 | #ifdef PT_GETFPREGS |
341 | ptrace (PT_GETFPREGS, inferior_pid, | |
342 | (PTRACE_ARG3_TYPE) & inferior_fp_registers, 0); | |
9cebe72f C |
343 | for (i = 0; i < 32; i++) |
344 | RF (FP0_REGNUM + i, inferior_fp_registers.r_regs[i]); | |
22c72081 | 345 | #endif |
9cebe72f C |
346 | } |
347 | ||
348 | /* Store our register values back into the inferior. | |
349 | If REGNO is -1, do this for all registers. | |
350 | Otherwise, REGNO specifies which register (so we can save time). */ | |
351 | ||
352 | void | |
fba45db2 | 353 | store_inferior_registers (int regno) |
9cebe72f C |
354 | { |
355 | struct reg inferior_registers; | |
22c72081 | 356 | #ifdef PT_SETFPREGS |
9cebe72f | 357 | struct fpreg inferior_fp_registers; |
22c72081 | 358 | #endif |
9cebe72f C |
359 | int i; |
360 | ||
361 | for (i = 0; i < 32; i++) | |
362 | RS (i, inferior_registers.fixreg[i]); | |
22c72081 C |
363 | RS (PPC_LR_REGNUM, inferior_registers.lr); |
364 | RS (PPC_CR_REGNUM, inferior_registers.cr); | |
365 | RS (PPC_XER_REGNUM, inferior_registers.xer); | |
366 | RS (PPC_CTR_REGNUM, inferior_registers.ctr); | |
9cebe72f | 367 | RS (PC_REGNUM, inferior_registers.pc); |
22c72081 C |
368 | ptrace (PT_SETREGS, inferior_pid, |
369 | (PTRACE_ARG3_TYPE) & inferior_registers, 0); | |
9cebe72f | 370 | |
22c72081 | 371 | #ifdef PT_SETFPREGS |
9cebe72f C |
372 | for (i = 0; i < 32; i++) |
373 | RS (FP0_REGNUM + i, inferior_fp_registers.r_regs[i]); | |
9cebe72f C |
374 | ptrace (PT_SETFPREGS, inferior_pid, |
375 | (PTRACE_ARG3_TYPE) & inferior_fp_registers, 0); | |
22c72081 | 376 | #endif |
9cebe72f C |
377 | } |
378 | #endif /* !__powerpc__ */ | |
d6e9fb05 JK |
379 | |
380 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
381 | in the NEW_SUN_PTRACE case. | |
382 | It ought to be straightforward. But it appears that writing did | |
383 | not write the data that I specified. I cannot understand where | |
384 | it got the data that it actually did write. */ | |
385 | ||
386 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
387 | to debugger memory starting at MYADDR. */ | |
388 | ||
fba45db2 | 389 | read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) |
d6e9fb05 JK |
390 | { |
391 | register int i; | |
392 | /* Round starting address down to longword boundary. */ | |
393 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
394 | /* Round ending address up; get number of longwords that makes. */ | |
395 | register int count | |
396 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
397 | /* Allocate buffer of that many longwords. */ | |
398 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
399 | ||
400 | /* Read all the longwords */ | |
401 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
402 | { | |
403 | buffer[i] = ptrace (PT_READ_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); | |
404 | } | |
405 | ||
406 | /* Copy appropriate bytes out of the buffer. */ | |
407 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
408 | } | |
409 | ||
410 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
411 | to inferior's memory at MEMADDR. | |
412 | On failure (cannot write the inferior) | |
413 | returns the value of errno. */ | |
414 | ||
415 | int | |
fba45db2 | 416 | write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) |
d6e9fb05 JK |
417 | { |
418 | register int i; | |
419 | /* Round starting address down to longword boundary. */ | |
420 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
421 | /* Round ending address up; get number of longwords that makes. */ | |
422 | register int count | |
423 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
424 | /* Allocate buffer of that many longwords. */ | |
425 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
426 | extern int errno; | |
427 | ||
428 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
429 | ||
430 | buffer[0] = ptrace (PT_READ_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); | |
431 | ||
432 | if (count > 1) | |
433 | { | |
434 | buffer[count - 1] | |
435 | = ptrace (PT_READ_D, inferior_pid, | |
436 | (PTRACE_ARG3_TYPE) addr + (count - 1) * sizeof (int), 0); | |
437 | } | |
438 | ||
439 | /* Copy data to be written over corresponding part of buffer */ | |
440 | ||
441 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
442 | ||
443 | /* Write the entire buffer. */ | |
444 | ||
445 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
446 | { | |
447 | errno = 0; | |
448 | ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); | |
449 | if (errno) | |
450 | return errno; | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | \f | |
456 | void | |
fba45db2 | 457 | initialize_low (void) |
d6e9fb05 JK |
458 | { |
459 | initialize_arch (); | |
460 | } |