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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 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | /*************************** | |
24 | #include "initialize.h" | |
25 | ****************************/ | |
26 | ||
27 | #include <stdio.h> | |
28 | #include <sys/param.h> | |
29 | #include <sys/dir.h> | |
30 | /*#include <sys/user.h>*/ | |
31 | #define LYNXOS | |
32 | #include <sys/mem.h> | |
33 | #include <sys/signal.h> | |
34 | #include <sys/file.h> | |
35 | #include <sys/kernel.h> | |
36 | #include <sys/itimer.h> | |
37 | #include <sys/time.h> | |
38 | #include <sys/resource.h> | |
39 | #include <sys/proc.h> | |
40 | #include <signal.h> | |
41 | #include <sys/ioctl.h> | |
42 | #include <sgtty.h> | |
43 | #include <fcntl.h> | |
44 | #include "/usr/include/wait.h" | |
45 | ||
46 | /***************Begin MY defs*********************/ | |
47 | int quit_flag = 0; | |
48 | char registers[REGISTER_BYTES]; | |
49 | ||
50 | /* Index within `registers' of the first byte of the space for | |
51 | register N. */ | |
52 | ||
53 | ||
54 | char buf2[MAX_REGISTER_RAW_SIZE]; | |
55 | /***************End MY defs*********************/ | |
56 | ||
57 | #include <sys/ptrace.h> | |
58 | /*#include <machine/reg.h>*/ | |
59 | ||
60 | extern char **environ; | |
61 | extern int errno; | |
62 | extern int inferior_pid; | |
63 | void error (), quit (), perror_with_name (); | |
64 | int query (); | |
65 | ||
66 | /* Start an inferior process and returns its pid. | |
67 | ALLARGS is a vector of program-name and args. | |
68 | ENV is the environment vector to pass. */ | |
69 | ||
70 | int | |
f450d101 SG |
71 | create_inferior (program, allargs) |
72 | char *program; | |
e20520b8 | 73 | char **allargs; |
e20520b8 SG |
74 | { |
75 | int pid; | |
e20520b8 SG |
76 | |
77 | pid = fork (); | |
78 | if (pid < 0) | |
79 | perror_with_name ("fork"); | |
80 | ||
81 | if (pid == 0) | |
82 | { | |
e20520b8 SG |
83 | ptrace (PTRACE_TRACEME); |
84 | ||
f450d101 | 85 | execv (program, allargs); |
e20520b8 | 86 | |
f450d101 | 87 | fprintf (stderr, "Cannot exec %s: %s.\n", program, |
e20520b8 SG |
88 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); |
89 | fflush (stderr); | |
90 | _exit (0177); | |
91 | } | |
92 | ||
93 | return pid; | |
94 | } | |
95 | ||
96 | /* Kill the inferior process. Make us have no inferior. */ | |
97 | ||
98 | void | |
99 | kill_inferior () | |
100 | { | |
101 | if (inferior_pid == 0) | |
102 | return; | |
103 | ptrace (8, inferior_pid, 0, 0); | |
104 | wait (0); | |
105 | /*************inferior_died ();****VK**************/ | |
106 | } | |
107 | ||
108 | /* Wait for process, returns status */ | |
109 | ||
110 | unsigned char | |
111 | mywait (status) | |
112 | char *status; | |
113 | { | |
114 | int pid; | |
115 | union wait w; | |
116 | ||
117 | pid = wait (&w); | |
118 | if (pid != PIDGET(inferior_pid)) | |
119 | perror_with_name ("wait"); | |
120 | ||
121 | inferior_pid = BUILDPID (inferior_pid, w.w_tid); | |
122 | ||
123 | if (WIFEXITED (w)) | |
124 | { | |
125 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
126 | *status = 'E'; | |
127 | return ((unsigned char) WEXITSTATUS (w)); | |
128 | } | |
129 | else if (!WIFSTOPPED (w)) | |
130 | { | |
131 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
132 | *status = 'T'; | |
133 | return ((unsigned char) WTERMSIG (w)); | |
134 | } | |
135 | ||
136 | fetch_inferior_registers (0); | |
137 | ||
138 | *status = 'S'; | |
139 | return ((unsigned char) WSTOPSIG (w)); | |
140 | } | |
141 | ||
142 | /* Resume execution of the inferior process. | |
143 | If STEP is nonzero, single-step it. | |
144 | If SIGNAL is nonzero, give it that signal. */ | |
145 | ||
146 | void | |
147 | myresume (step, signal) | |
148 | int step; | |
149 | int signal; | |
150 | { | |
151 | errno = 0; | |
152 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
153 | if (errno) | |
154 | perror_with_name ("ptrace"); | |
155 | } | |
156 | ||
157 | #undef offsetof | |
158 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
159 | ||
160 | static struct econtext * | |
161 | lynx_registers_addr() | |
162 | { | |
163 | st_t *stblock; | |
164 | int ecpoff = offsetof(st_t, ecp); | |
165 | CORE_ADDR ecp; | |
166 | ||
167 | errno = 0; | |
168 | stblock = (st_t *) ptrace (PTRACE_THREADUSER, inferior_pid, | |
169 | (PTRACE_ARG3_TYPE)0, 0); | |
170 | if (errno) | |
171 | perror_with_name ("PTRACE_THREADUSER"); | |
172 | ||
173 | ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, inferior_pid, | |
174 | (PTRACE_ARG3_TYPE)ecpoff, 0); | |
175 | ecp -= (CORE_ADDR)stblock; | |
176 | if (errno) | |
177 | perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)"); | |
178 | ||
179 | return (struct econtext *)ecp; | |
180 | } | |
181 | ||
182 | static struct econtext *ecp; | |
183 | ||
184 | /* Mapping between GDB register #s and offsets into econtext. Must be | |
185 | consistent with REGISTER_NAMES macro in tm-i386v.h. */ | |
186 | ||
187 | #define X(ENTRY)(offsetof(struct econtext, ENTRY) / 4) | |
188 | static int regmap[] = { | |
189 | X(eax), | |
190 | X(ecx), | |
191 | X(edx), | |
192 | X(ebx), | |
193 | X(esp), | |
194 | X(ebp), | |
195 | X(esi), | |
196 | X(edi), | |
197 | X(eip), | |
198 | X(flags), /* ps */ | |
199 | X(cs), | |
200 | X(ss), | |
201 | X(ds), | |
202 | X(es), | |
203 | X(ecode), /* Lynx doesn't give us either fs or gs, so */ | |
204 | X(fault) /* we just substitute these two in the hopes | |
205 | that they are useful. */ | |
206 | }; | |
207 | ||
208 | /* Fetch one or more registers from the inferior. REGNO == -1 to get | |
209 | them all. We actually fetch more than requested, when convenient, | |
210 | marking them as valid so we won't fetch them again. */ | |
211 | ||
212 | void | |
213 | fetch_inferior_registers (ignored) | |
214 | int ignored; | |
215 | { | |
216 | int regno; | |
217 | unsigned long reg; | |
218 | struct econtext *ecp; | |
219 | ||
220 | ecp = lynx_registers_addr(); | |
221 | ||
222 | for (regno = 0; regno < NUM_REGS; regno++) | |
223 | { | |
224 | errno = 0; | |
225 | reg = ptrace (PTRACE_PEEKTHREAD, inferior_pid, | |
226 | (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), 0); | |
227 | if (errno) | |
228 | perror_with_name ("fetch_inferior_registers(PTRACE_PEEKTHREAD)"); | |
229 | ||
230 | *(unsigned long *)®isters[REGISTER_BYTE (regno)] = reg; | |
231 | } | |
232 | } | |
233 | ||
234 | /* Store our register values back into the inferior. | |
235 | If REGNO is -1, do this for all registers. | |
236 | Otherwise, REGNO specifies which register (so we can save time). */ | |
237 | ||
238 | void | |
239 | store_inferior_registers (ignored) | |
240 | int ignored; | |
241 | { | |
242 | int regno; | |
243 | unsigned long reg; | |
244 | struct econtext *ecp; | |
245 | ||
246 | ecp = lynx_registers_addr(); | |
247 | ||
248 | for (regno = 0; regno < NUM_REGS; regno++) | |
249 | { | |
250 | reg = *(unsigned long *)®isters[REGISTER_BYTE (regno)]; | |
251 | ||
252 | errno = 0; | |
253 | ptrace (PTRACE_POKEUSER, inferior_pid, | |
254 | (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), reg); | |
255 | if (errno) | |
256 | perror_with_name ("PTRACE_POKEUSER"); | |
257 | } | |
258 | } | |
259 | ||
260 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
261 | in the NEW_SUN_PTRACE case. | |
262 | It ought to be straightforward. But it appears that writing did | |
263 | not write the data that I specified. I cannot understand where | |
264 | it got the data that it actually did write. */ | |
265 | ||
266 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
267 | to debugger memory starting at MYADDR. */ | |
268 | ||
269 | read_inferior_memory (memaddr, myaddr, len) | |
270 | CORE_ADDR memaddr; | |
271 | char *myaddr; | |
272 | int len; | |
273 | { | |
274 | register int i; | |
275 | /* Round starting address down to longword boundary. */ | |
276 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
277 | /* Round ending address up; get number of longwords that makes. */ | |
278 | register int count | |
279 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
280 | /* Allocate buffer of that many longwords. */ | |
281 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
282 | ||
283 | /* Read all the longwords */ | |
284 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
285 | { | |
286 | buffer[i] = ptrace (1, inferior_pid, addr, 0); | |
287 | } | |
288 | ||
289 | /* Copy appropriate bytes out of the buffer. */ | |
290 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
291 | } | |
292 | ||
293 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
294 | to inferior's memory at MEMADDR. | |
295 | On failure (cannot write the inferior) | |
296 | returns the value of errno. */ | |
297 | ||
298 | int | |
299 | write_inferior_memory (memaddr, myaddr, len) | |
300 | CORE_ADDR memaddr; | |
301 | char *myaddr; | |
302 | int len; | |
303 | { | |
304 | register int i; | |
305 | /* Round starting address down to longword boundary. */ | |
306 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
307 | /* Round ending address up; get number of longwords that makes. */ | |
308 | register int count | |
309 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
310 | /* Allocate buffer of that many longwords. */ | |
311 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
312 | extern int errno; | |
313 | ||
314 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
315 | ||
316 | buffer[0] = ptrace (1, inferior_pid, addr, 0); | |
317 | ||
318 | if (count > 1) | |
319 | { | |
320 | buffer[count - 1] | |
321 | = ptrace (1, inferior_pid, | |
322 | addr + (count - 1) * sizeof (int), 0); | |
323 | } | |
324 | ||
325 | /* Copy data to be written over corresponding part of buffer */ | |
326 | ||
327 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
328 | ||
329 | /* Write the entire buffer. */ | |
330 | ||
331 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
332 | { | |
333 | errno = 0; | |
334 | ptrace (4, inferior_pid, addr, buffer[i]); | |
335 | if (errno) | |
336 | return errno; | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | \f | |
342 | void | |
343 | initialize () | |
344 | { | |
345 | inferior_pid = 0; | |
346 | } | |
347 | ||
348 | int | |
349 | have_inferior_p () | |
350 | { | |
351 | return inferior_pid != 0; | |
352 | } |