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38dc5e12 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. */ | |
799d5b6a SG |
19 | |
20 | #include "defs.h" | |
38dc5e12 | 21 | #include "/usr/include/sys/wait.h" |
799d5b6a SG |
22 | #include "frame.h" |
23 | #include "inferior.h" | |
24 | /*************************** | |
25 | #include "initialize.h" | |
26 | ****************************/ | |
27 | ||
28 | #include <stdio.h> | |
29 | #include <sys/param.h> | |
30 | #include <sys/dir.h> | |
31 | #include <sys/user.h> | |
32 | #include <signal.h> | |
33 | #include <sys/ioctl.h> | |
34 | #include <sgtty.h> | |
35 | #include <fcntl.h> | |
36 | ||
37 | /***************Begin MY defs*********************/ | |
38 | int quit_flag = 0; | |
39 | char registers[REGISTER_BYTES]; | |
40 | ||
41 | /* Index within `registers' of the first byte of the space for | |
42 | register N. */ | |
43 | ||
44 | ||
45 | char buf2[MAX_REGISTER_RAW_SIZE]; | |
46 | /***************End MY defs*********************/ | |
47 | ||
48 | #include <sys/ptrace.h> | |
49 | #include <machine/reg.h> | |
50 | ||
51 | extern char **environ; | |
52 | extern int errno; | |
53 | extern int inferior_pid; | |
54 | void error (), quit (), perror_with_name (); | |
55 | int query (); | |
799d5b6a SG |
56 | |
57 | /* Start an inferior process and returns its pid. | |
58 | ALLARGS is a vector of program-name and args. | |
59 | ENV is the environment vector to pass. */ | |
60 | ||
61 | int | |
62 | create_inferior (allargs, env) | |
63 | char **allargs; | |
64 | char **env; | |
65 | { | |
66 | int pid; | |
67 | extern int sys_nerr; | |
68 | extern char *sys_errlist[]; | |
69 | extern int errno; | |
70 | char status; | |
71 | char execbuf[1024]; | |
72 | ||
73 | /* exec is said to fail if the executable is open. */ | |
74 | /****************close_exec_file ();*****************/ | |
75 | ||
76 | sprintf (execbuf, "exec %s", allargs); | |
77 | ||
78 | pid = vfork (); | |
79 | if (pid < 0) | |
80 | perror_with_name ("vfork"); | |
81 | ||
82 | if (pid == 0) | |
83 | { | |
84 | /* Run inferior in a separate process group. */ | |
85 | setpgrp (getpid (), getpid ()); | |
86 | ||
87 | errno = 0; | |
88 | ptrace (PTRACE_TRACEME); | |
89 | ||
90 | execle ("/bin/sh", "sh", "-c", execbuf, 0, env); | |
91 | ||
92 | fprintf (stderr, "Cannot exec /bin/sh: %s.\n", | |
93 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); | |
94 | fflush (stderr); | |
95 | _exit (0177); | |
96 | } | |
97 | ||
98 | return pid; | |
99 | } | |
100 | ||
101 | /* Kill the inferior process. Make us have no inferior. */ | |
102 | ||
103 | void | |
104 | kill_inferior () | |
105 | { | |
106 | if (inferior_pid == 0) | |
107 | return; | |
108 | ptrace (8, inferior_pid, 0, 0); | |
109 | wait (0); | |
110 | /*************inferior_died ();****VK**************/ | |
111 | } | |
112 | ||
38dc5e12 | 113 | /* Wait for process, returns status */ |
799d5b6a SG |
114 | |
115 | unsigned char | |
38dc5e12 | 116 | mywait (status) |
799d5b6a SG |
117 | char *status; |
118 | { | |
119 | int pid; | |
38dc5e12 | 120 | union wait w; |
799d5b6a | 121 | |
799d5b6a SG |
122 | pid = wait (&w); |
123 | if (pid != inferior_pid) | |
124 | perror_with_name ("wait"); | |
125 | ||
799d5b6a SG |
126 | if (WIFEXITED (w)) |
127 | { | |
38dc5e12 | 128 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); |
799d5b6a SG |
129 | *status = 'E'; |
130 | return ((unsigned char) WEXITSTATUS (w)); | |
131 | } | |
132 | else if (!WIFSTOPPED (w)) | |
133 | { | |
38dc5e12 | 134 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); |
799d5b6a SG |
135 | *status = 'T'; |
136 | return ((unsigned char) WTERMSIG (w)); | |
137 | } | |
38dc5e12 SG |
138 | |
139 | fetch_inferior_registers (0); | |
140 | ||
141 | *status = 'S'; | |
142 | return ((unsigned char) WSTOPSIG (w)); | |
799d5b6a SG |
143 | } |
144 | ||
38dc5e12 SG |
145 | /* Resume execution of the inferior process. |
146 | If STEP is nonzero, single-step it. | |
147 | If SIGNAL is nonzero, give it that signal. */ | |
148 | ||
149 | void | |
150 | myresume (step, signal) | |
151 | int step; | |
152 | int signal; | |
153 | { | |
154 | errno = 0; | |
155 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
156 | if (errno) | |
157 | perror_with_name ("ptrace"); | |
158 | } | |
799d5b6a SG |
159 | |
160 | /* Fetch one or more registers from the inferior. REGNO == -1 to get | |
161 | them all. We actually fetch more than requested, when convenient, | |
162 | marking them as valid so we won't fetch them again. */ | |
163 | ||
164 | void | |
165 | fetch_inferior_registers (ignored) | |
166 | int ignored; | |
167 | { | |
168 | struct regs inferior_registers; | |
169 | struct fp_status inferior_fp_registers; | |
170 | int i; | |
171 | ||
172 | /* Global and Out regs are fetched directly, as well as the control | |
173 | registers. If we're getting one of the in or local regs, | |
174 | and the stack pointer has not yet been fetched, | |
175 | we have to do that first, since they're found in memory relative | |
176 | to the stack pointer. */ | |
177 | ||
178 | if (ptrace (PTRACE_GETREGS, inferior_pid, | |
179 | (PTRACE_ARG3_TYPE) &inferior_registers, 0)) | |
180 | perror("ptrace_getregs"); | |
181 | ||
182 | registers[REGISTER_BYTE (0)] = 0; | |
183 | memcpy (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1, | |
184 | 15 * REGISTER_RAW_SIZE (G0_REGNUM)); | |
185 | *(int *)®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; | |
186 | *(int *)®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc; | |
187 | *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc; | |
188 | *(int *)®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y; | |
189 | ||
190 | /* Floating point registers */ | |
191 | ||
192 | if (ptrace (PTRACE_GETFPREGS, inferior_pid, | |
193 | (PTRACE_ARG3_TYPE) &inferior_fp_registers, | |
194 | 0)) | |
195 | perror("ptrace_getfpregs"); | |
196 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers, | |
197 | sizeof inferior_fp_registers.fpu_fr); | |
198 | ||
199 | /* These regs are saved on the stack by the kernel. Only read them | |
200 | all (16 ptrace calls!) if we really need them. */ | |
201 | ||
202 | read_inferior_memory (*(CORE_ADDR*)®isters[REGISTER_BYTE (SP_REGNUM)], | |
203 | ®isters[REGISTER_BYTE (L0_REGNUM)], | |
204 | 16*REGISTER_RAW_SIZE (L0_REGNUM)); | |
205 | } | |
206 | ||
207 | /* Store our register values back into the inferior. | |
208 | If REGNO is -1, do this for all registers. | |
209 | Otherwise, REGNO specifies which register (so we can save time). */ | |
210 | ||
211 | void | |
212 | store_inferior_registers (ignored) | |
213 | int ignored; | |
214 | { | |
215 | struct regs inferior_registers; | |
216 | struct fp_status inferior_fp_registers; | |
217 | CORE_ADDR sp = *(CORE_ADDR *)®isters[REGISTER_BYTE (SP_REGNUM)]; | |
218 | ||
219 | write_inferior_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)], | |
220 | 16*REGISTER_RAW_SIZE (L0_REGNUM)); | |
221 | ||
222 | memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)], | |
223 | 15 * REGISTER_RAW_SIZE (G1_REGNUM)); | |
224 | ||
225 | inferior_registers.r_ps = | |
226 | *(int *)®isters[REGISTER_BYTE (PS_REGNUM)]; | |
227 | inferior_registers.r_pc = | |
228 | *(int *)®isters[REGISTER_BYTE (PC_REGNUM)]; | |
229 | inferior_registers.r_npc = | |
230 | *(int *)®isters[REGISTER_BYTE (NPC_REGNUM)]; | |
231 | inferior_registers.r_y = | |
232 | *(int *)®isters[REGISTER_BYTE (Y_REGNUM)]; | |
233 | ||
234 | if (ptrace (PTRACE_SETREGS, inferior_pid, | |
235 | (PTRACE_ARG3_TYPE) &inferior_registers, 0)) | |
236 | perror("ptrace_setregs"); | |
237 | ||
238 | memcpy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)], | |
239 | sizeof inferior_fp_registers.fpu_fr); | |
240 | ||
241 | if (ptrace (PTRACE_SETFPREGS, inferior_pid, | |
242 | (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0)) | |
243 | perror("ptrace_setfpregs"); | |
244 | } | |
245 | ||
799d5b6a SG |
246 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory |
247 | in the NEW_SUN_PTRACE case. | |
248 | It ought to be straightforward. But it appears that writing did | |
249 | not write the data that I specified. I cannot understand where | |
250 | it got the data that it actually did write. */ | |
251 | ||
252 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
253 | to debugger memory starting at MYADDR. */ | |
254 | ||
255 | read_inferior_memory (memaddr, myaddr, len) | |
256 | CORE_ADDR memaddr; | |
257 | char *myaddr; | |
258 | int len; | |
259 | { | |
260 | register int i; | |
261 | /* Round starting address down to longword boundary. */ | |
262 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
263 | /* Round ending address up; get number of longwords that makes. */ | |
264 | register int count | |
265 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
266 | /* Allocate buffer of that many longwords. */ | |
267 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
268 | ||
269 | /* Read all the longwords */ | |
270 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
271 | { | |
272 | buffer[i] = ptrace (1, inferior_pid, addr, 0); | |
273 | } | |
274 | ||
275 | /* Copy appropriate bytes out of the buffer. */ | |
276 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
277 | } | |
278 | ||
279 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
280 | to inferior's memory at MEMADDR. | |
281 | On failure (cannot write the inferior) | |
282 | returns the value of errno. */ | |
283 | ||
284 | int | |
285 | write_inferior_memory (memaddr, myaddr, len) | |
286 | CORE_ADDR memaddr; | |
287 | char *myaddr; | |
288 | int len; | |
289 | { | |
290 | register int i; | |
291 | /* Round starting address down to longword boundary. */ | |
292 | register CORE_ADDR addr = memaddr & -sizeof (int); | |
293 | /* Round ending address up; get number of longwords that makes. */ | |
294 | register int count | |
295 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
296 | /* Allocate buffer of that many longwords. */ | |
297 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
298 | extern int errno; | |
299 | ||
300 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
301 | ||
302 | buffer[0] = ptrace (1, inferior_pid, addr, 0); | |
303 | ||
304 | if (count > 1) | |
305 | { | |
306 | buffer[count - 1] | |
307 | = ptrace (1, inferior_pid, | |
308 | addr + (count - 1) * sizeof (int), 0); | |
309 | } | |
310 | ||
311 | /* Copy data to be written over corresponding part of buffer */ | |
312 | ||
313 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
314 | ||
315 | /* Write the entire buffer. */ | |
316 | ||
317 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
318 | { | |
319 | errno = 0; | |
320 | ptrace (4, inferior_pid, addr, buffer[i]); | |
321 | if (errno) | |
322 | return errno; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | \f | |
799d5b6a SG |
328 | void |
329 | initialize () | |
330 | { | |
799d5b6a | 331 | inferior_pid = 0; |
799d5b6a SG |
332 | } |
333 | ||
799d5b6a SG |
334 | int |
335 | have_inferior_p () | |
336 | { | |
337 | return inferior_pid != 0; | |
338 | } |