Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1993, 1994, 1995, 1997, 1999, 2000, 2001 |
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 "initialize.h" | |
28 | ****************************/ | |
29 | ||
30 | #include <stdio.h> | |
31 | #include <sys/param.h> | |
32 | #include <sys/dir.h> | |
33 | #include <sys/user.h> | |
34 | #include <signal.h> | |
35 | #include <sys/ioctl.h> | |
36 | #include <sgtty.h> | |
37 | #include <fcntl.h> | |
38 | ||
39 | /***************Begin MY defs*********************/ | |
5c44784c JM |
40 | static char my_registers[REGISTER_BYTES]; |
41 | char *registers = my_registers; | |
c906108c SS |
42 | /***************End MY defs*********************/ |
43 | ||
44 | #include <sys/ptrace.h> | |
45 | #include <sys/reg.h> | |
46 | ||
47 | extern int sys_nerr; | |
48 | extern char **sys_errlist; | |
c906108c | 49 | extern int errno; |
c906108c SS |
50 | |
51 | /* Start an inferior process and returns its pid. | |
bd2fa4f6 | 52 | ALLARGS is a vector of program-name and args. */ |
c906108c SS |
53 | |
54 | int | |
fba45db2 | 55 | create_inferior (char *program, char **allargs) |
c906108c SS |
56 | { |
57 | int pid; | |
58 | ||
59 | pid = fork (); | |
60 | if (pid < 0) | |
61 | perror_with_name ("fork"); | |
62 | ||
63 | if (pid == 0) | |
64 | { | |
65 | ptrace (PTRACE_TRACEME); | |
66 | ||
67 | execv (program, allargs); | |
68 | ||
69 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
70 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); | |
71 | fflush (stderr); | |
72 | _exit (0177); | |
73 | } | |
74 | ||
75 | return pid; | |
76 | } | |
77 | ||
78 | /* Kill the inferior process. Make us have no inferior. */ | |
79 | ||
80 | void | |
fba45db2 | 81 | kill_inferior (void) |
c906108c SS |
82 | { |
83 | if (inferior_pid == 0) | |
84 | return; | |
85 | ptrace (8, inferior_pid, 0, 0); | |
86 | wait (0); | |
c5aa993b | 87 | /*************inferior_died ();****VK**************/ |
c906108c SS |
88 | } |
89 | ||
90 | /* Return nonzero if the given thread is still alive. */ | |
91 | int | |
fba45db2 | 92 | mythread_alive (int pid) |
c906108c SS |
93 | { |
94 | return 1; | |
95 | } | |
96 | ||
97 | /* Wait for process, returns status */ | |
98 | ||
99 | unsigned char | |
fba45db2 | 100 | mywait (char *status) |
c906108c SS |
101 | { |
102 | int pid; | |
103 | union wait w; | |
104 | ||
cf30a8e1 C |
105 | enable_async_io (); |
106 | pid = waitpid (inferior_pid, &w, 0); | |
107 | disable_async_io (); | |
c906108c SS |
108 | if (pid != inferior_pid) |
109 | perror_with_name ("wait"); | |
110 | ||
111 | if (WIFEXITED (w)) | |
112 | { | |
113 | fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); | |
114 | *status = 'W'; | |
115 | return ((unsigned char) WEXITSTATUS (w)); | |
116 | } | |
117 | else if (!WIFSTOPPED (w)) | |
118 | { | |
119 | fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); | |
120 | *status = 'X'; | |
121 | return ((unsigned char) WTERMSIG (w)); | |
122 | } | |
123 | ||
124 | fetch_inferior_registers (0); | |
125 | ||
126 | *status = 'T'; | |
127 | return ((unsigned char) WSTOPSIG (w)); | |
128 | } | |
129 | ||
130 | /* Resume execution of the inferior process. | |
131 | If STEP is nonzero, single-step it. | |
132 | If SIGNAL is nonzero, give it that signal. */ | |
133 | ||
134 | void | |
fba45db2 | 135 | myresume (int step, int signal) |
c906108c SS |
136 | { |
137 | errno = 0; | |
138 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal); | |
139 | if (errno) | |
140 | perror_with_name ("ptrace"); | |
141 | } | |
142 | ||
143 | /* Fetch one or more registers from the inferior. REGNO == -1 to get | |
144 | them all. We actually fetch more than requested, when convenient, | |
145 | marking them as valid so we won't fetch them again. */ | |
146 | ||
147 | void | |
fba45db2 | 148 | fetch_inferior_registers (int ignored) |
c906108c SS |
149 | { |
150 | struct regs inferior_registers; | |
151 | struct fp_status inferior_fp_registers; | |
152 | int i; | |
153 | ||
154 | /* Global and Out regs are fetched directly, as well as the control | |
155 | registers. If we're getting one of the in or local regs, | |
156 | and the stack pointer has not yet been fetched, | |
157 | we have to do that first, since they're found in memory relative | |
158 | to the stack pointer. */ | |
159 | ||
160 | if (ptrace (PTRACE_GETREGS, inferior_pid, | |
c5aa993b JM |
161 | (PTRACE_ARG3_TYPE) & inferior_registers, 0)) |
162 | perror ("ptrace_getregs"); | |
163 | ||
c906108c SS |
164 | registers[REGISTER_BYTE (0)] = 0; |
165 | memcpy (®isters[REGISTER_BYTE (1)], &inferior_registers.r_g1, | |
166 | 15 * REGISTER_RAW_SIZE (G0_REGNUM)); | |
c5aa993b JM |
167 | *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; |
168 | *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc; | |
169 | *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc; | |
170 | *(int *) ®isters[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y; | |
c906108c SS |
171 | |
172 | /* Floating point registers */ | |
173 | ||
174 | if (ptrace (PTRACE_GETFPREGS, inferior_pid, | |
c5aa993b | 175 | (PTRACE_ARG3_TYPE) & inferior_fp_registers, |
c906108c | 176 | 0)) |
c5aa993b | 177 | perror ("ptrace_getfpregs"); |
c906108c SS |
178 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers, |
179 | sizeof inferior_fp_registers.fpu_fr); | |
180 | ||
181 | /* These regs are saved on the stack by the kernel. Only read them | |
182 | all (16 ptrace calls!) if we really need them. */ | |
183 | ||
c5aa993b | 184 | read_inferior_memory (*(CORE_ADDR *) & registers[REGISTER_BYTE (SP_REGNUM)], |
c906108c | 185 | ®isters[REGISTER_BYTE (L0_REGNUM)], |
c5aa993b | 186 | 16 * REGISTER_RAW_SIZE (L0_REGNUM)); |
c906108c SS |
187 | } |
188 | ||
189 | /* Store our register values back into the inferior. | |
190 | If REGNO is -1, do this for all registers. | |
191 | Otherwise, REGNO specifies which register (so we can save time). */ | |
192 | ||
193 | void | |
fba45db2 | 194 | store_inferior_registers (int ignored) |
c906108c SS |
195 | { |
196 | struct regs inferior_registers; | |
197 | struct fp_status inferior_fp_registers; | |
c5aa993b | 198 | CORE_ADDR sp = *(CORE_ADDR *) & registers[REGISTER_BYTE (SP_REGNUM)]; |
c906108c SS |
199 | |
200 | write_inferior_memory (sp, ®isters[REGISTER_BYTE (L0_REGNUM)], | |
c5aa993b | 201 | 16 * REGISTER_RAW_SIZE (L0_REGNUM)); |
c906108c SS |
202 | |
203 | memcpy (&inferior_registers.r_g1, ®isters[REGISTER_BYTE (G1_REGNUM)], | |
204 | 15 * REGISTER_RAW_SIZE (G1_REGNUM)); | |
205 | ||
206 | inferior_registers.r_ps = | |
c5aa993b | 207 | *(int *) ®isters[REGISTER_BYTE (PS_REGNUM)]; |
c906108c | 208 | inferior_registers.r_pc = |
c5aa993b | 209 | *(int *) ®isters[REGISTER_BYTE (PC_REGNUM)]; |
c906108c | 210 | inferior_registers.r_npc = |
c5aa993b | 211 | *(int *) ®isters[REGISTER_BYTE (NPC_REGNUM)]; |
c906108c | 212 | inferior_registers.r_y = |
c5aa993b | 213 | *(int *) ®isters[REGISTER_BYTE (Y_REGNUM)]; |
c906108c SS |
214 | |
215 | if (ptrace (PTRACE_SETREGS, inferior_pid, | |
c5aa993b JM |
216 | (PTRACE_ARG3_TYPE) & inferior_registers, 0)) |
217 | perror ("ptrace_setregs"); | |
c906108c SS |
218 | |
219 | memcpy (&inferior_fp_registers, ®isters[REGISTER_BYTE (FP0_REGNUM)], | |
220 | sizeof inferior_fp_registers.fpu_fr); | |
221 | ||
222 | if (ptrace (PTRACE_SETFPREGS, inferior_pid, | |
c5aa993b JM |
223 | (PTRACE_ARG3_TYPE) & inferior_fp_registers, 0)) |
224 | perror ("ptrace_setfpregs"); | |
c906108c SS |
225 | } |
226 | ||
227 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
228 | in the NEW_SUN_PTRACE case. | |
229 | It ought to be straightforward. But it appears that writing did | |
230 | not write the data that I specified. I cannot understand where | |
231 | it got the data that it actually did write. */ | |
232 | ||
233 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
234 | to debugger memory starting at MYADDR. */ | |
235 | ||
af471f3c | 236 | void |
fba45db2 | 237 | read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) |
c906108c SS |
238 | { |
239 | register int i; | |
240 | /* Round starting address down to longword boundary. */ | |
9f30d7f5 | 241 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int); |
c906108c SS |
242 | /* Round ending address up; get number of longwords that makes. */ |
243 | register int count | |
244 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
245 | /* Allocate buffer of that many longwords. */ | |
246 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
247 | ||
248 | /* Read all the longwords */ | |
249 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
250 | { | |
251 | buffer[i] = ptrace (1, inferior_pid, addr, 0); | |
252 | } | |
253 | ||
254 | /* Copy appropriate bytes out of the buffer. */ | |
255 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
256 | } | |
257 | ||
258 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
259 | to inferior's memory at MEMADDR. | |
260 | On failure (cannot write the inferior) | |
261 | returns the value of errno. */ | |
262 | ||
263 | int | |
fba45db2 | 264 | write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len) |
c906108c SS |
265 | { |
266 | register int i; | |
267 | /* Round starting address down to longword boundary. */ | |
9f30d7f5 | 268 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int); |
c906108c SS |
269 | /* Round ending address up; get number of longwords that makes. */ |
270 | register int count | |
271 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
272 | /* Allocate buffer of that many longwords. */ | |
273 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
274 | extern int errno; | |
275 | ||
276 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
277 | ||
278 | buffer[0] = ptrace (1, inferior_pid, addr, 0); | |
279 | ||
280 | if (count > 1) | |
281 | { | |
282 | buffer[count - 1] | |
283 | = ptrace (1, inferior_pid, | |
284 | addr + (count - 1) * sizeof (int), 0); | |
285 | } | |
286 | ||
287 | /* Copy data to be written over corresponding part of buffer */ | |
288 | ||
289 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
290 | ||
291 | /* Write the entire buffer. */ | |
292 | ||
293 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
294 | { | |
295 | errno = 0; | |
296 | ptrace (4, inferior_pid, addr, buffer[i]); | |
297 | if (errno) | |
298 | return errno; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | } | |
303 | \f | |
304 | void | |
fba45db2 | 305 | initialize_low (void) |
c906108c | 306 | { |
c906108c | 307 | } |