Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
db728ff7 | 2 | Copyright 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001, 2002 |
b6ba6518 | 3 | Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c | 21 | |
f29d9b6d | 22 | #include "server.h" |
c906108c SS |
23 | #include "<sys/wait.h>" |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
26 | ||
27 | #include <stdio.h> | |
28 | #include <sys/param.h> | |
29 | #include <sys/dir.h> | |
30 | #include <sys/user.h> | |
31 | #include <signal.h> | |
32 | #include <sys/ioctl.h> | |
33 | #include <sgtty.h> | |
34 | #include <fcntl.h> | |
35 | ||
36 | /***************Begin MY defs*********************/ | |
5c44784c JM |
37 | static char my_registers[REGISTER_BYTES]; |
38 | char *registers = my_registers; | |
c906108c SS |
39 | /***************End MY defs*********************/ |
40 | ||
41 | #include <sys/ptrace.h> | |
42 | #include <machine/reg.h> | |
43 | ||
44 | extern int sys_nerr; | |
45 | extern char **sys_errlist; | |
c906108c | 46 | extern int errno; |
c906108c SS |
47 | |
48 | /* Start an inferior process and returns its pid. | |
bd2fa4f6 | 49 | ALLARGS is a vector of program-name and args. */ |
c906108c SS |
50 | |
51 | int | |
fba45db2 | 52 | create_inferior (char *program, char **allargs) |
c906108c SS |
53 | { |
54 | int pid; | |
55 | ||
56 | pid = fork (); | |
57 | if (pid < 0) | |
58 | perror_with_name ("fork"); | |
59 | ||
60 | if (pid == 0) | |
61 | { | |
62 | ptrace (PTRACE_TRACEME); | |
63 | ||
64 | execv (program, allargs); | |
65 | ||
66 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
67 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); | |
68 | fflush (stderr); | |
69 | _exit (0177); | |
70 | } | |
71 | ||
72 | return pid; | |
73 | } | |
74 | ||
45b7b345 DJ |
75 | /* Attaching is not supported. */ |
76 | int | |
77 | myattach (int pid) | |
78 | { | |
79 | return -1; | |
80 | } | |
81 | ||
c906108c SS |
82 | /* Kill the inferior process. Make us have no inferior. */ |
83 | ||
84 | void | |
fba45db2 | 85 | kill_inferior (void) |
c906108c SS |
86 | { |
87 | if (inferior_pid == 0) | |
88 | return; | |
89 | ptrace (8, inferior_pid, 0, 0); | |
90 | wait (0); | |
c5aa993b | 91 | /*************inferior_died ();****VK**************/ |
c906108c SS |
92 | } |
93 | ||
94 | /* Return nonzero if the given thread is still alive. */ | |
95 | int | |
fba45db2 | 96 | mythread_alive (int pid) |
c906108c SS |
97 | { |
98 | return 1; | |
99 | } | |
100 | ||
101 | /* Wait for process, returns status */ | |
102 | ||
103 | unsigned char | |
fba45db2 | 104 | mywait (char *status) |
c906108c SS |
105 | { |
106 | int pid; | |
107 | union wait w; | |
108 | ||
109 | pid = wait (&w); | |
110 | if (pid != inferior_pid) | |
111 | perror_with_name ("wait"); | |
112 | ||
113 | if (WIFEXITED (w)) | |
114 | { | |
115 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
116 | *status = 'W'; | |
117 | return ((unsigned char) WEXITSTATUS (w)); | |
118 | } | |
119 | else if (!WIFSTOPPED (w)) | |
120 | { | |
121 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
122 | *status = 'X'; | |
123 | return ((unsigned char) WTERMSIG (w)); | |
124 | } | |
125 | ||
126 | fetch_inferior_registers (0); | |
127 | ||
128 | *status = 'T'; | |
129 | return ((unsigned char) WSTOPSIG (w)); | |
130 | } | |
131 | ||
132 | /* Resume execution of the inferior process. | |
133 | If STEP is nonzero, single-step it. | |
134 | If SIGNAL is nonzero, give it that signal. */ | |
135 | ||
136 | void | |
fba45db2 | 137 | myresume (int step, int signal) |
c906108c SS |
138 | { |
139 | errno = 0; | |
140 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
141 | if (errno) | |
142 | perror_with_name ("ptrace"); | |
143 | } | |
144 | ||
145 | /* Fetch one or more registers from the inferior. REGNO == -1 to get | |
146 | them all. We actually fetch more than requested, when convenient, | |
147 | marking them as valid so we won't fetch them again. */ | |
148 | ||
149 | void | |
fba45db2 | 150 | fetch_inferior_registers (int ignored) |
c906108c SS |
151 | { |
152 | struct regs inferior_registers; | |
153 | struct fp_status inferior_fp_registers; | |
154 | ||
155 | ptrace (PTRACE_GETREGS, inferior_pid, | |
c5aa993b | 156 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c SS |
157 | #ifdef FP0_REGNUM |
158 | ptrace (PTRACE_GETFPREGS, inferior_pid, | |
c5aa993b JM |
159 | (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
160 | #endif | |
161 | ||
c906108c SS |
162 | memcpy (registers, &inferior_registers, 16 * 4); |
163 | #ifdef FP0_REGNUM | |
164 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers, | |
165 | sizeof inferior_fp_registers.fps_regs); | |
c5aa993b JM |
166 | #endif |
167 | *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; | |
168 | *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc; | |
c906108c SS |
169 | #ifdef FP0_REGNUM |
170 | memcpy | |
171 | (®isters[REGISTER_BYTE (FPC_REGNUM)], | |
172 | &inferior_fp_registers.fps_control, | |
173 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs); | |
c5aa993b | 174 | #endif |
c906108c SS |
175 | } |
176 | ||
177 | /* Store our register values back into the inferior. | |
178 | If REGNO is -1, do this for all registers. | |
179 | Otherwise, REGNO specifies which register (so we can save time). */ | |
180 | ||
181 | void | |
fba45db2 | 182 | store_inferior_registers (int ignored) |
c906108c SS |
183 | { |
184 | struct regs inferior_registers; | |
185 | struct fp_status inferior_fp_registers; | |
186 | ||
187 | memcpy (&inferior_registers, registers, 16 * 4); | |
188 | #ifdef FP0_REGNUM | |
189 | memcpy (&inferior_fp_registers, | |
190 | ®isters[REGISTER_BYTE (FP0_REGNUM)], | |
191 | sizeof inferior_fp_registers.fps_regs); | |
192 | #endif | |
c5aa993b JM |
193 | inferior_registers.r_ps = *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; |
194 | inferior_registers.r_pc = *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; | |
c906108c SS |
195 | |
196 | #ifdef FP0_REGNUM | |
197 | memcpy (&inferior_fp_registers.fps_control, | |
198 | ®isters[REGISTER_BYTE (FPC_REGNUM)], | |
199 | (sizeof inferior_fp_registers | |
200 | - sizeof inferior_fp_registers.fps_regs)); | |
201 | #endif | |
202 | ||
203 | ptrace (PTRACE_SETREGS, inferior_pid, | |
c5aa993b | 204 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c SS |
205 | #if FP0_REGNUM |
206 | ptrace (PTRACE_SETFPREGS, inferior_pid, | |
c5aa993b | 207 | (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
c906108c SS |
208 | #endif |
209 | } | |
210 | ||
211 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
212 | in the NEW_SUN_PTRACE case. | |
213 | It ought to be straightforward. But it appears that writing did | |
214 | not write the data that I specified. I cannot understand where | |
215 | it got the data that it actually did write. */ | |
216 | ||
217 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
218 | to debugger memory starting at MYADDR. */ | |
219 | ||
af471f3c | 220 | void |
fba45db2 | 221 | read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) |
c906108c SS |
222 | { |
223 | register int i; | |
224 | /* Round starting address down to longword boundary. */ | |
9f30d7f5 | 225 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int); |
c906108c SS |
226 | /* Round ending address up; get number of longwords that makes. */ |
227 | register int count | |
228 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
229 | /* Allocate buffer of that many longwords. */ | |
230 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
231 | ||
232 | /* Read all the longwords */ | |
233 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
234 | { | |
235 | buffer[i] = ptrace (1, inferior_pid, addr, 0); | |
236 | } | |
237 | ||
238 | /* Copy appropriate bytes out of the buffer. */ | |
239 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
240 | } | |
241 | ||
242 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
243 | to inferior's memory at MEMADDR. | |
244 | On failure (cannot write the inferior) | |
245 | returns the value of errno. */ | |
246 | ||
247 | int | |
fba45db2 | 248 | write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) |
c906108c SS |
249 | { |
250 | register int i; | |
251 | /* Round starting address down to longword boundary. */ | |
9f30d7f5 | 252 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int); |
c906108c SS |
253 | /* Round ending address up; get number of longwords that makes. */ |
254 | register int count | |
255 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
256 | /* Allocate buffer of that many longwords. */ | |
257 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
258 | extern int errno; | |
259 | ||
260 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
261 | ||
262 | buffer[0] = ptrace (1, inferior_pid, addr, 0); | |
263 | ||
264 | if (count > 1) | |
265 | { | |
266 | buffer[count - 1] | |
267 | = ptrace (1, inferior_pid, | |
268 | addr + (count - 1) * sizeof (int), 0); | |
269 | } | |
270 | ||
271 | /* Copy data to be written over corresponding part of buffer */ | |
272 | ||
273 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
274 | ||
275 | /* Write the entire buffer. */ | |
276 | ||
277 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
278 | { | |
279 | errno = 0; | |
280 | ptrace (4, inferior_pid, addr, buffer[i]); | |
281 | if (errno) | |
282 | return errno; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | \f | |
288 | void | |
fba45db2 | 289 | initialize_low (void) |
c906108c | 290 | { |
c906108c | 291 | } |