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e20520b8 SG |
1 | /* Low level interface to ptrace, for the remote server for GDB. |
2 | Copyright (C) 1986, 1987, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
41e170e2 | 20 | #include "server.h" |
e20520b8 SG |
21 | #include "frame.h" |
22 | #include "inferior.h" | |
e20520b8 SG |
23 | |
24 | #include <stdio.h> | |
25 | #include <sys/param.h> | |
26 | #include <sys/dir.h> | |
e20520b8 SG |
27 | #define LYNXOS |
28 | #include <sys/mem.h> | |
29 | #include <sys/signal.h> | |
30 | #include <sys/file.h> | |
31 | #include <sys/kernel.h> | |
32 | #include <sys/itimer.h> | |
33 | #include <sys/time.h> | |
34 | #include <sys/resource.h> | |
35 | #include <sys/proc.h> | |
36 | #include <signal.h> | |
37 | #include <sys/ioctl.h> | |
38 | #include <sgtty.h> | |
39 | #include <fcntl.h> | |
4c0b3e57 | 40 | #include <sys/wait.h> |
e20520b8 | 41 | |
e20520b8 SG |
42 | char registers[REGISTER_BYTES]; |
43 | ||
e20520b8 | 44 | #include <sys/ptrace.h> |
e20520b8 SG |
45 | |
46 | /* Start an inferior process and returns its pid. | |
db691e4b | 47 | ALLARGS is a vector of program-name and args. */ |
e20520b8 SG |
48 | |
49 | int | |
f450d101 SG |
50 | create_inferior (program, allargs) |
51 | char *program; | |
e20520b8 | 52 | char **allargs; |
e20520b8 SG |
53 | { |
54 | int pid; | |
e20520b8 SG |
55 | |
56 | pid = fork (); | |
57 | if (pid < 0) | |
58 | perror_with_name ("fork"); | |
59 | ||
60 | if (pid == 0) | |
61 | { | |
db691e4b SG |
62 | int pgrp; |
63 | ||
64 | /* Switch child to it's own process group so that signals won't | |
65 | directly affect gdbserver. */ | |
66 | ||
67 | pgrp = getpid(); | |
68 | setpgrp(0, pgrp); | |
69 | ioctl (0, TIOCSPGRP, &pgrp); | |
70 | ||
e20520b8 SG |
71 | ptrace (PTRACE_TRACEME); |
72 | ||
f450d101 | 73 | execv (program, allargs); |
e20520b8 | 74 | |
db691e4b SG |
75 | fprintf (stderr, "GDBserver (process %d): Cannot exec %s: %s.\n", |
76 | getpid(), program, | |
e20520b8 SG |
77 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); |
78 | fflush (stderr); | |
79 | _exit (0177); | |
80 | } | |
81 | ||
82 | return pid; | |
83 | } | |
84 | ||
85 | /* Kill the inferior process. Make us have no inferior. */ | |
86 | ||
87 | void | |
88 | kill_inferior () | |
89 | { | |
90 | if (inferior_pid == 0) | |
91 | return; | |
41e170e2 | 92 | ptrace (PTRACE_KILL, inferior_pid, 0, 0); |
e20520b8 | 93 | wait (0); |
41e170e2 SG |
94 | |
95 | inferior_pid = 0; | |
e20520b8 SG |
96 | } |
97 | ||
98 | /* Wait for process, returns status */ | |
99 | ||
100 | unsigned char | |
101 | mywait (status) | |
102 | char *status; | |
103 | { | |
104 | int pid; | |
105 | union wait w; | |
106 | ||
41e170e2 SG |
107 | enable_async_io(); |
108 | ||
e20520b8 | 109 | pid = wait (&w); |
41e170e2 SG |
110 | |
111 | disable_async_io(); | |
112 | ||
e20520b8 SG |
113 | if (pid != PIDGET(inferior_pid)) |
114 | perror_with_name ("wait"); | |
115 | ||
116 | inferior_pid = BUILDPID (inferior_pid, w.w_tid); | |
117 | ||
118 | if (WIFEXITED (w)) | |
119 | { | |
41e170e2 SG |
120 | fprintf (stderr, "\nChild exited with status %d\n", WEXITSTATUS (w)); |
121 | fprintf (stderr, "GDBserver exiting\n"); | |
122 | exit (0); | |
e20520b8 SG |
123 | } |
124 | else if (!WIFSTOPPED (w)) | |
125 | { | |
126 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
127 | *status = 'T'; | |
128 | return ((unsigned char) WTERMSIG (w)); | |
129 | } | |
130 | ||
131 | fetch_inferior_registers (0); | |
132 | ||
133 | *status = 'S'; | |
134 | return ((unsigned char) WSTOPSIG (w)); | |
135 | } | |
136 | ||
137 | /* Resume execution of the inferior process. | |
138 | If STEP is nonzero, single-step it. | |
139 | If SIGNAL is nonzero, give it that signal. */ | |
140 | ||
141 | void | |
142 | myresume (step, signal) | |
143 | int step; | |
144 | int signal; | |
145 | { | |
146 | errno = 0; | |
147 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
148 | if (errno) | |
149 | perror_with_name ("ptrace"); | |
150 | } | |
151 | ||
152 | #undef offsetof | |
153 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
154 | ||
9a13e99e SG |
155 | /* Mapping between GDB register #s and offsets into econtext. Must be |
156 | consistent with REGISTER_NAMES macro in various tmXXX.h files. */ | |
e20520b8 | 157 | |
9a13e99e | 158 | #define X(ENTRY)(offsetof(struct econtext, ENTRY)) |
e20520b8 | 159 | |
9a13e99e SG |
160 | #ifdef I386 |
161 | /* Mappings from tm-i386v.h */ | |
e20520b8 | 162 | |
9a13e99e SG |
163 | static int regmap[] = |
164 | { | |
e20520b8 SG |
165 | X(eax), |
166 | X(ecx), | |
167 | X(edx), | |
168 | X(ebx), | |
9a13e99e SG |
169 | X(esp), /* sp */ |
170 | X(ebp), /* fp */ | |
e20520b8 SG |
171 | X(esi), |
172 | X(edi), | |
9a13e99e | 173 | X(eip), /* pc */ |
e20520b8 SG |
174 | X(flags), /* ps */ |
175 | X(cs), | |
176 | X(ss), | |
177 | X(ds), | |
178 | X(es), | |
179 | X(ecode), /* Lynx doesn't give us either fs or gs, so */ | |
9a13e99e | 180 | X(fault), /* we just substitute these two in the hopes |
e20520b8 | 181 | that they are useful. */ |
9a13e99e SG |
182 | }; |
183 | #endif | |
184 | ||
185 | #ifdef M68K | |
186 | /* Mappings from tm-m68k.h */ | |
187 | ||
188 | static int regmap[] = | |
189 | { | |
190 | X(regs[0]), /* d0 */ | |
191 | X(regs[1]), /* d1 */ | |
192 | X(regs[2]), /* d2 */ | |
193 | X(regs[3]), /* d3 */ | |
194 | X(regs[4]), /* d4 */ | |
195 | X(regs[5]), /* d5 */ | |
196 | X(regs[6]), /* d6 */ | |
197 | X(regs[7]), /* d7 */ | |
198 | X(regs[8]), /* a0 */ | |
199 | X(regs[9]), /* a1 */ | |
200 | X(regs[10]), /* a2 */ | |
201 | X(regs[11]), /* a3 */ | |
202 | X(regs[12]), /* a4 */ | |
203 | X(regs[13]), /* a5 */ | |
204 | X(regs[14]), /* fp */ | |
205 | 0, /* sp */ | |
206 | X(status), /* ps */ | |
207 | X(pc), | |
208 | ||
209 | X(fregs[0*3]), /* fp0 */ | |
210 | X(fregs[1*3]), /* fp1 */ | |
211 | X(fregs[2*3]), /* fp2 */ | |
212 | X(fregs[3*3]), /* fp3 */ | |
213 | X(fregs[4*3]), /* fp4 */ | |
214 | X(fregs[5*3]), /* fp5 */ | |
215 | X(fregs[6*3]), /* fp6 */ | |
216 | X(fregs[7*3]), /* fp7 */ | |
217 | ||
218 | X(fcregs[0]), /* fpcontrol */ | |
219 | X(fcregs[1]), /* fpstatus */ | |
220 | X(fcregs[2]), /* fpiaddr */ | |
221 | X(ssw), /* fpcode */ | |
222 | X(fault), /* fpflags */ | |
223 | }; | |
224 | #endif | |
225 | ||
226 | /* Return the offset relative to the start of the per-thread data to the | |
227 | saved context block. */ | |
228 | ||
229 | static unsigned long | |
230 | lynx_registers_addr() | |
231 | { | |
232 | CORE_ADDR stblock; | |
233 | int ecpoff = offsetof(st_t, ecp); | |
234 | CORE_ADDR ecp; | |
235 | ||
236 | errno = 0; | |
237 | stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, inferior_pid, | |
238 | (PTRACE_ARG3_TYPE)0, 0); | |
239 | if (errno) | |
240 | perror_with_name ("PTRACE_THREADUSER"); | |
241 | ||
242 | ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, inferior_pid, | |
243 | (PTRACE_ARG3_TYPE)ecpoff, 0); | |
244 | if (errno) | |
245 | perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)"); | |
246 | ||
247 | return ecp - stblock; | |
248 | } | |
e20520b8 SG |
249 | |
250 | /* Fetch one or more registers from the inferior. REGNO == -1 to get | |
251 | them all. We actually fetch more than requested, when convenient, | |
252 | marking them as valid so we won't fetch them again. */ | |
253 | ||
254 | void | |
255 | fetch_inferior_registers (ignored) | |
256 | int ignored; | |
257 | { | |
258 | int regno; | |
259 | unsigned long reg; | |
9a13e99e | 260 | unsigned long ecp; |
e20520b8 SG |
261 | |
262 | ecp = lynx_registers_addr(); | |
263 | ||
264 | for (regno = 0; regno < NUM_REGS; regno++) | |
265 | { | |
9a13e99e SG |
266 | int ptrace_fun = PTRACE_PEEKTHREAD; |
267 | ||
268 | #ifdef PTRACE_PEEKUSP | |
269 | ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD; | |
270 | #endif | |
271 | ||
e20520b8 | 272 | errno = 0; |
9a13e99e SG |
273 | reg = ptrace (ptrace_fun, inferior_pid, |
274 | (PTRACE_ARG3_TYPE) (ecp + regmap[regno]), 0); | |
e20520b8 SG |
275 | if (errno) |
276 | perror_with_name ("fetch_inferior_registers(PTRACE_PEEKTHREAD)"); | |
277 | ||
278 | *(unsigned long *)®isters[REGISTER_BYTE (regno)] = reg; | |
279 | } | |
280 | } | |
281 | ||
282 | /* Store our register values back into the inferior. | |
283 | If REGNO is -1, do this for all registers. | |
284 | Otherwise, REGNO specifies which register (so we can save time). */ | |
285 | ||
286 | void | |
287 | store_inferior_registers (ignored) | |
288 | int ignored; | |
289 | { | |
290 | int regno; | |
291 | unsigned long reg; | |
9a13e99e | 292 | unsigned long ecp; |
e20520b8 SG |
293 | |
294 | ecp = lynx_registers_addr(); | |
295 | ||
296 | for (regno = 0; regno < NUM_REGS; regno++) | |
297 | { | |
9a13e99e SG |
298 | int ptrace_fun = PTRACE_POKEUSER; |
299 | ||
300 | #ifdef PTRACE_POKEUSP | |
301 | ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER; | |
302 | #endif | |
303 | ||
e20520b8 SG |
304 | reg = *(unsigned long *)®isters[REGISTER_BYTE (regno)]; |
305 | ||
306 | errno = 0; | |
9a13e99e SG |
307 | ptrace (ptrace_fun, inferior_pid, |
308 | (PTRACE_ARG3_TYPE) (ecp + regmap[regno]), reg); | |
e20520b8 SG |
309 | if (errno) |
310 | perror_with_name ("PTRACE_POKEUSER"); | |
311 | } | |
312 | } | |
313 | ||
314 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
315 | in the NEW_SUN_PTRACE case. | |
316 | It ought to be straightforward. But it appears that writing did | |
317 | not write the data that I specified. I cannot understand where | |
318 | it got the data that it actually did write. */ | |
319 | ||
320 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
321 | to debugger memory starting at MYADDR. */ | |
322 | ||
41e170e2 | 323 | void |
e20520b8 SG |
324 | read_inferior_memory (memaddr, myaddr, len) |
325 | CORE_ADDR memaddr; | |
326 | char *myaddr; | |
327 | int len; | |
328 | { | |
329 | register int i; | |
330 | /* Round starting address down to longword boundary. */ | |
331 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
332 | /* Round ending address up; get number of longwords that makes. */ | |
333 | register int count | |
334 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
335 | /* Allocate buffer of that many longwords. */ | |
336 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
337 | ||
338 | /* Read all the longwords */ | |
339 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
340 | { | |
41e170e2 | 341 | buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); |
e20520b8 SG |
342 | } |
343 | ||
344 | /* Copy appropriate bytes out of the buffer. */ | |
a6e0dae9 | 345 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
e20520b8 SG |
346 | } |
347 | ||
348 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
349 | to inferior's memory at MEMADDR. | |
350 | On failure (cannot write the inferior) | |
351 | returns the value of errno. */ | |
352 | ||
353 | int | |
354 | write_inferior_memory (memaddr, myaddr, len) | |
355 | CORE_ADDR memaddr; | |
356 | char *myaddr; | |
357 | int len; | |
358 | { | |
359 | register int i; | |
360 | /* Round starting address down to longword boundary. */ | |
361 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
362 | /* Round ending address up; get number of longwords that makes. */ | |
363 | register int count | |
364 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
365 | /* Allocate buffer of that many longwords. */ | |
366 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
367 | extern int errno; | |
368 | ||
369 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
370 | ||
41e170e2 | 371 | buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0); |
e20520b8 SG |
372 | |
373 | if (count > 1) | |
374 | { | |
375 | buffer[count - 1] | |
41e170e2 | 376 | = ptrace (PTRACE_PEEKTEXT, inferior_pid, |
e20520b8 SG |
377 | addr + (count - 1) * sizeof (int), 0); |
378 | } | |
379 | ||
380 | /* Copy data to be written over corresponding part of buffer */ | |
381 | ||
a6e0dae9 | 382 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
e20520b8 SG |
383 | |
384 | /* Write the entire buffer. */ | |
385 | ||
386 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
387 | { | |
db691e4b SG |
388 | while (1) |
389 | { | |
390 | errno = 0; | |
391 | ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]); | |
392 | if (errno) | |
393 | { | |
394 | fprintf(stderr, "ptrace (PTRACE_POKETEXT): errno=%d, inferior_pid=0x%x, addr=0x%x, buffer[i] = 0x%x\n", errno, inferior_pid, addr, buffer[i]); | |
395 | fprintf(stderr, "Sleeping for 1 second\n"); | |
396 | sleep(1); | |
397 | } | |
398 | else | |
399 | break; | |
400 | } | |
e20520b8 SG |
401 | } |
402 | ||
403 | return 0; | |
404 | } |