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c906108c SS |
1 | /* Low level interface to ptrace, for the remote server for GDB. |
2 | Copyright (C) 1995 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> | |
29 | #include <sys/user.h> | |
30 | #include <signal.h> | |
31 | #include <sys/ioctl.h> | |
32 | #include <sgtty.h> | |
33 | #include <fcntl.h> | |
34 | ||
35 | /***************Begin MY defs*********************/ | |
36 | int quit_flag = 0; | |
37 | char registers[REGISTER_BYTES]; | |
38 | ||
39 | /* Index within `registers' of the first byte of the space for | |
40 | register N. */ | |
41 | ||
42 | ||
43 | char buf2[MAX_REGISTER_RAW_SIZE]; | |
44 | /***************End MY defs*********************/ | |
45 | ||
46 | #include <sys/ptrace.h> | |
47 | #include <machine/reg.h> | |
48 | ||
49 | extern char **environ; | |
50 | extern int errno; | |
51 | extern int inferior_pid; | |
52 | void quit (), perror_with_name (); | |
53 | int query (); | |
54 | ||
55 | /* Start an inferior process and returns its pid. | |
56 | ALLARGS is a vector of program-name and args. | |
57 | ENV is the environment vector to pass. */ | |
58 | ||
59 | int | |
60 | create_inferior (program, allargs) | |
61 | char *program; | |
62 | char **allargs; | |
63 | { | |
64 | int pid; | |
65 | ||
66 | pid = fork (); | |
67 | if (pid < 0) | |
68 | perror_with_name ("fork"); | |
69 | ||
70 | if (pid == 0) | |
71 | { | |
72 | ptrace (PT_TRACE_ME, 0, 0, 0, 0); | |
73 | ||
74 | execv (program, allargs); | |
75 | ||
76 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
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; | |
92 | ptrace (8, inferior_pid, 0, 0, 0); | |
93 | wait (0); | |
c5aa993b | 94 | /*************inferior_died ();****VK**************/ |
c906108c SS |
95 | } |
96 | ||
97 | /* Return nonzero if the given thread is still alive. */ | |
98 | int | |
99 | mythread_alive (pid) | |
100 | int pid; | |
101 | { | |
102 | return 1; | |
103 | } | |
104 | ||
105 | /* Wait for process, returns status */ | |
106 | ||
107 | unsigned char | |
108 | mywait (status) | |
109 | char *status; | |
110 | { | |
111 | int pid; | |
112 | union wait w; | |
113 | ||
114 | pid = wait (&w); | |
115 | if (pid != inferior_pid) | |
116 | perror_with_name ("wait"); | |
117 | ||
118 | if (WIFEXITED (w)) | |
119 | { | |
120 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
121 | *status = 'W'; | |
122 | return ((unsigned char) WEXITSTATUS (w)); | |
123 | } | |
124 | else if (!WIFSTOPPED (w)) | |
125 | { | |
126 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
127 | *status = 'X'; | |
128 | return ((unsigned char) WTERMSIG (w)); | |
129 | } | |
130 | ||
131 | fetch_inferior_registers (0); | |
132 | ||
133 | *status = 'T'; | |
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 ? PT_STEP : PT_CONTINUE, inferior_pid, 1, signal, 0); | |
148 | if (errno) | |
149 | perror_with_name ("ptrace"); | |
150 | } | |
151 | ||
152 | ||
153 | #if !defined (offsetof) | |
154 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
155 | #endif | |
156 | ||
157 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
158 | #if !defined (U_REGS_OFFSET) | |
159 | #define U_REGS_OFFSET \ | |
160 | ptrace (PT_READ_U, inferior_pid, \ | |
161 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ | |
162 | - KERNEL_U_ADDR | |
163 | #endif | |
164 | ||
165 | CORE_ADDR | |
166 | register_addr (regno, blockend) | |
167 | int regno; | |
168 | CORE_ADDR blockend; | |
169 | { | |
170 | CORE_ADDR addr; | |
171 | ||
172 | if (regno < 0 || regno >= ARCH_NUM_REGS) | |
173 | error ("Invalid register number %d.", regno); | |
174 | ||
175 | REGISTER_U_ADDR (addr, blockend, regno); | |
176 | ||
177 | return addr; | |
178 | } | |
179 | ||
180 | /* Fetch one register. */ | |
181 | ||
182 | static void | |
183 | fetch_register (regno) | |
184 | int regno; | |
185 | { | |
186 | register unsigned int regaddr; | |
187 | char buf[MAX_REGISTER_RAW_SIZE]; | |
188 | register int i; | |
189 | ||
190 | /* Offset of registers within the u area. */ | |
191 | unsigned int offset; | |
192 | ||
193 | offset = U_REGS_OFFSET; | |
194 | ||
195 | regaddr = register_addr (regno, offset); | |
196 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
197 | { | |
198 | errno = 0; | |
c5aa993b JM |
199 | *(int *) ®isters[regno * 4 + i] = ptrace (PT_RUREGS, inferior_pid, |
200 | (PTRACE_ARG3_TYPE) regaddr, 0, 0); | |
c906108c SS |
201 | regaddr += sizeof (int); |
202 | if (errno != 0) | |
203 | { | |
204 | /* Warning, not error, in case we are attached; sometimes the | |
205 | kernel doesn't let us at the registers. */ | |
206 | char *err = strerror (errno); | |
207 | char *msg = alloca (strlen (err) + 128); | |
208 | sprintf (msg, "reading register %d: %s", regno, err); | |
209 | error (msg); | |
210 | goto error_exit; | |
211 | } | |
212 | } | |
c5aa993b | 213 | error_exit:; |
c906108c SS |
214 | } |
215 | ||
216 | /* Fetch all registers, or just one, from the child process. */ | |
217 | ||
218 | void | |
219 | fetch_inferior_registers (regno) | |
220 | int regno; | |
221 | { | |
222 | if (regno == -1 || regno == 0) | |
223 | for (regno = 0; regno < NUM_REGS; regno++) | |
224 | fetch_register (regno); | |
225 | else | |
226 | fetch_register (regno); | |
227 | } | |
228 | ||
229 | /* Store our register values back into the inferior. | |
230 | If REGNO is -1, do this for all registers. | |
231 | Otherwise, REGNO specifies which register (so we can save time). */ | |
232 | ||
233 | void | |
234 | store_inferior_registers (regno) | |
235 | int regno; | |
236 | { | |
237 | register unsigned int regaddr; | |
238 | char buf[80]; | |
239 | extern char registers[]; | |
240 | register int i; | |
241 | unsigned int offset = U_REGS_OFFSET; | |
242 | int scratch; | |
243 | ||
244 | if (regno >= 0) | |
245 | { | |
246 | if (CANNOT_STORE_REGISTER (regno)) | |
247 | return; | |
248 | regaddr = register_addr (regno, offset); | |
249 | errno = 0; | |
250 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
c5aa993b JM |
251 | { |
252 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; | |
253 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
254 | scratch, 0); | |
255 | if (errno != 0) | |
256 | { | |
c906108c | 257 | /* Error, even if attached. Failing to write these two |
c5aa993b JM |
258 | registers is pretty serious. */ |
259 | sprintf (buf, "writing register number %d", regno); | |
260 | perror_with_name (buf); | |
261 | } | |
262 | } | |
c906108c | 263 | else |
c5aa993b | 264 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
c906108c SS |
265 | { |
266 | errno = 0; | |
267 | ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
268 | *(int *) ®isters[REGISTER_BYTE (regno) + i], 0); | |
269 | if (errno != 0) | |
270 | { | |
271 | /* Warning, not error, in case we are attached; sometimes the | |
272 | kernel doesn't let us at the registers. */ | |
273 | char *err = strerror (errno); | |
274 | char *msg = alloca (strlen (err) + 128); | |
275 | sprintf (msg, "writing register %d: %s", | |
276 | regno, err); | |
277 | error (msg); | |
278 | return; | |
279 | } | |
c5aa993b | 280 | regaddr += sizeof (int); |
c906108c SS |
281 | } |
282 | } | |
283 | else | |
284 | for (regno = 0; regno < NUM_REGS; regno++) | |
285 | store_inferior_registers (regno); | |
286 | } | |
287 | ||
288 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
289 | in the NEW_SUN_PTRACE case. | |
290 | It ought to be straightforward. But it appears that writing did | |
291 | not write the data that I specified. I cannot understand where | |
292 | it got the data that it actually did write. */ | |
293 | ||
294 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
295 | to debugger memory starting at MYADDR. */ | |
296 | ||
297 | read_inferior_memory (memaddr, myaddr, len) | |
298 | CORE_ADDR memaddr; | |
299 | char *myaddr; | |
300 | int len; | |
301 | { | |
302 | register int i; | |
303 | /* Round starting address down to longword boundary. */ | |
304 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
305 | /* Round ending address up; get number of longwords that makes. */ | |
306 | register int count | |
307 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
308 | /* Allocate buffer of that many longwords. */ | |
309 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
310 | ||
311 | /* Read all the longwords */ | |
312 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
313 | { | |
314 | buffer[i] = ptrace (1, inferior_pid, addr, 0, 0); | |
315 | } | |
316 | ||
317 | /* Copy appropriate bytes out of the buffer. */ | |
318 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
319 | } | |
320 | ||
321 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
322 | to inferior's memory at MEMADDR. | |
323 | On failure (cannot write the inferior) | |
324 | returns the value of errno. */ | |
325 | ||
326 | int | |
327 | write_inferior_memory (memaddr, myaddr, len) | |
328 | CORE_ADDR memaddr; | |
329 | char *myaddr; | |
330 | int len; | |
331 | { | |
332 | register int i; | |
333 | /* Round starting address down to longword boundary. */ | |
334 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
335 | /* Round ending address up; get number of longwords that makes. */ | |
336 | register int count | |
337 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
338 | /* Allocate buffer of that many longwords. */ | |
339 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
340 | extern int errno; | |
341 | ||
342 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
343 | ||
344 | buffer[0] = ptrace (1, inferior_pid, addr, 0, 0); | |
345 | ||
346 | if (count > 1) | |
347 | { | |
348 | buffer[count - 1] | |
349 | = ptrace (1, inferior_pid, | |
350 | addr + (count - 1) * sizeof (int), 0, 0); | |
351 | } | |
352 | ||
353 | /* Copy data to be written over corresponding part of buffer */ | |
354 | ||
355 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
356 | ||
357 | /* Write the entire buffer. */ | |
358 | ||
359 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
360 | { | |
361 | errno = 0; | |
362 | ptrace (4, inferior_pid, addr, buffer[i], 0); | |
363 | if (errno) | |
364 | return errno; | |
365 | } | |
366 | ||
367 | return 0; | |
368 | } | |
369 | \f | |
370 | void | |
371 | initialize () | |
372 | { | |
373 | inferior_pid = 0; | |
374 | } | |
375 | ||
376 | int | |
377 | have_inferior_p () | |
378 | { | |
379 | return inferior_pid != 0; | |
380 | } |