Mercurial > hg > graal-compiler
annotate agent/src/os/linux/ps_proc.c @ 9808:12fdb8fe0a35
turn assertions in NodeClass.FieldScanner into guarantees
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 17 May 2013 15:41:39 +0200 |
parents | 2394a89e89f4 |
children | f2512d89ad0c |
rev | line source |
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0 | 1 /* |
8058 | 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #include <stdio.h> | |
26 #include <stdlib.h> | |
27 #include <string.h> | |
8058 | 28 #include <signal.h> |
0 | 29 #include <errno.h> |
30 #include <sys/ptrace.h> | |
31 #include "libproc_impl.h" | |
32 | |
33 #if defined(x86_64) && !defined(amd64) | |
34 #define amd64 1 | |
35 #endif | |
36 | |
37 #ifndef __WALL | |
38 #define __WALL 0x40000000 // Copied from /usr/include/linux/wait.h | |
39 #endif | |
40 | |
41 // This file has the libproc implementation specific to live process | |
42 // For core files, refer to ps_core.c | |
43 | |
44 static inline uintptr_t align(uintptr_t ptr, size_t size) { | |
45 return (ptr & ~(size - 1)); | |
46 } | |
47 | |
48 // --------------------------------------------- | |
49 // ptrace functions | |
50 // --------------------------------------------- | |
51 | |
52 // read "size" bytes of data from "addr" within the target process. | |
53 // unlike the standard ptrace() function, process_read_data() can handle | |
54 // unaligned address - alignment check, if required, should be done | |
55 // before calling process_read_data. | |
56 | |
57 static bool process_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { | |
58 long rslt; | |
59 size_t i, words; | |
60 uintptr_t end_addr = addr + size; | |
61 uintptr_t aligned_addr = align(addr, sizeof(long)); | |
62 | |
63 if (aligned_addr != addr) { | |
64 char *ptr = (char *)&rslt; | |
65 errno = 0; | |
66 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
67 if (errno) { | |
68 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
69 return false; | |
70 } | |
71 for (; aligned_addr != addr; aligned_addr++, ptr++); | |
72 for (; ((intptr_t)aligned_addr % sizeof(long)) && aligned_addr < end_addr; | |
73 aligned_addr++) | |
74 *(buf++) = *(ptr++); | |
75 } | |
76 | |
77 words = (end_addr - aligned_addr) / sizeof(long); | |
78 | |
79 // assert((intptr_t)aligned_addr % sizeof(long) == 0); | |
80 for (i = 0; i < words; i++) { | |
81 errno = 0; | |
82 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
83 if (errno) { | |
84 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
85 return false; | |
86 } | |
87 *(long *)buf = rslt; | |
88 buf += sizeof(long); | |
89 aligned_addr += sizeof(long); | |
90 } | |
91 | |
92 if (aligned_addr != end_addr) { | |
93 char *ptr = (char *)&rslt; | |
94 errno = 0; | |
95 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
96 if (errno) { | |
97 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
98 return false; | |
99 } | |
100 for (; aligned_addr != end_addr; aligned_addr++) | |
101 *(buf++) = *(ptr++); | |
102 } | |
103 return true; | |
104 } | |
105 | |
106 // null implementation for write | |
107 static bool process_write_data(struct ps_prochandle* ph, | |
108 uintptr_t addr, const char *buf , size_t size) { | |
109 return false; | |
110 } | |
111 | |
112 // "user" should be a pointer to a user_regs_struct | |
113 static bool process_get_lwp_regs(struct ps_prochandle* ph, pid_t pid, struct user_regs_struct *user) { | |
114 // we have already attached to all thread 'pid's, just use ptrace call | |
115 // to get regset now. Note that we don't cache regset upfront for processes. | |
116 // Linux on x86 and sparc are different. On x86 ptrace(PTRACE_GETREGS, ...) | |
117 // uses pointer from 4th argument and ignores 3rd argument. On sparc it uses | |
118 // pointer from 3rd argument and ignores 4th argument | |
119 #if defined(sparc) || defined(sparcv9) | |
120 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, addr, data) | |
121 #else | |
122 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, data, addr) | |
123 #endif | |
124 | |
1990 | 125 #if defined(_LP64) && defined(PTRACE_GETREGS64) |
0 | 126 #define PTRACE_GETREGS_REQ PTRACE_GETREGS64 |
1990 | 127 #elif defined(PTRACE_GETREGS) |
128 #define PTRACE_GETREGS_REQ PTRACE_GETREGS | |
129 #elif defined(PT_GETREGS) | |
130 #define PTRACE_GETREGS_REQ PT_GETREGS | |
0 | 131 #endif |
132 | |
133 #ifdef PTRACE_GETREGS_REQ | |
134 if (ptrace_getregs(PTRACE_GETREGS_REQ, pid, user, NULL) < 0) { | |
135 print_debug("ptrace(PTRACE_GETREGS, ...) failed for lwp %d\n", pid); | |
136 return false; | |
137 } | |
138 return true; | |
139 #else | |
140 print_debug("ptrace(PTRACE_GETREGS, ...) not supported\n"); | |
141 return false; | |
142 #endif | |
143 | |
144 } | |
145 | |
8058 | 146 static bool ptrace_continue(pid_t pid, int signal) { |
147 // pass the signal to the process so we don't swallow it | |
148 if (ptrace(PTRACE_CONT, pid, NULL, signal) < 0) { | |
149 print_debug("ptrace(PTRACE_CONT, ..) failed for %d\n", pid); | |
150 return false; | |
151 } | |
152 return true; | |
153 } | |
154 | |
155 // waits until the ATTACH has stopped the process | |
156 // by signal SIGSTOP | |
157 static bool ptrace_waitpid(pid_t pid) { | |
158 int ret; | |
159 int status; | |
160 while (true) { | |
161 // Wait for debuggee to stop. | |
162 ret = waitpid(pid, &status, 0); | |
163 if (ret == -1 && errno == ECHILD) { | |
164 // try cloned process. | |
165 ret = waitpid(pid, &status, __WALL); | |
166 } | |
167 if (ret >= 0) { | |
168 if (WIFSTOPPED(status)) { | |
169 // Any signal will stop the thread, make sure it is SIGSTOP. Otherwise SIGSTOP | |
170 // will still be pending and delivered when the process is DETACHED and the process | |
171 // will go to sleep. | |
172 if (WSTOPSIG(status) == SIGSTOP) { | |
173 // Debuggee stopped by SIGSTOP. | |
174 return true; | |
175 } | |
176 if (!ptrace_continue(pid, WSTOPSIG(status))) { | |
177 print_error("Failed to correctly attach to VM. VM might HANG! [PTRACE_CONT failed, stopped by %d]\n", WSTOPSIG(status)); | |
178 return false; | |
179 } | |
180 } else { | |
181 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status); | |
182 return false; | |
183 } | |
184 } else { | |
185 switch (errno) { | |
186 case EINTR: | |
187 continue; | |
188 break; | |
189 case ECHILD: | |
190 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid); | |
191 break; | |
192 case EINVAL: | |
193 print_debug("waitpid() failed. Invalid options argument.\n"); | |
194 break; | |
195 default: | |
196 print_debug("waitpid() failed. Unexpected error %d\n",errno); | |
197 break; | |
198 } | |
199 return false; | |
200 } | |
201 } | |
202 } | |
203 | |
0 | 204 // attach to a process/thread specified by "pid" |
205 static bool ptrace_attach(pid_t pid) { | |
206 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) { | |
207 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid); | |
208 return false; | |
209 } else { | |
8058 | 210 return ptrace_waitpid(pid); |
0 | 211 } |
212 } | |
213 | |
214 // ------------------------------------------------------- | |
215 // functions for obtaining library information | |
216 // ------------------------------------------------------- | |
217 | |
218 /* | |
219 * splits a string _str_ into substrings with delimiter _delim_ by replacing old * delimiters with _new_delim_ (ideally, '\0'). the address of each substring | |
220 * is stored in array _ptrs_ as the return value. the maximum capacity of _ptrs_ * array is specified by parameter _n_. | |
221 * RETURN VALUE: total number of substrings (always <= _n_) | |
222 * NOTE: string _str_ is modified if _delim_!=_new_delim_ | |
223 */ | |
224 static int split_n_str(char * str, int n, char ** ptrs, char delim, char new_delim) | |
225 { | |
226 int i; | |
227 for(i = 0; i < n; i++) ptrs[i] = NULL; | |
228 if (str == NULL || n < 1 ) return 0; | |
229 | |
230 i = 0; | |
231 | |
232 // skipping leading blanks | |
233 while(*str&&*str==delim) str++; | |
234 | |
235 while(*str&&i<n){ | |
236 ptrs[i++] = str; | |
237 while(*str&&*str!=delim) str++; | |
238 while(*str&&*str==delim) *(str++) = new_delim; | |
239 } | |
240 | |
241 return i; | |
242 } | |
243 | |
244 /* | |
245 * fgets without storing '\n' at the end of the string | |
246 */ | |
247 static char * fgets_no_cr(char * buf, int n, FILE *fp) | |
248 { | |
249 char * rslt = fgets(buf, n, fp); | |
250 if (rslt && buf && *buf){ | |
251 char *p = strchr(buf, '\0'); | |
252 if (*--p=='\n') *p='\0'; | |
253 } | |
254 return rslt; | |
255 } | |
256 | |
257 // callback for read_thread_info | |
258 static bool add_new_thread(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) { | |
259 return add_thread_info(ph, pthread_id, lwp_id) != NULL; | |
260 } | |
261 | |
262 static bool read_lib_info(struct ps_prochandle* ph) { | |
263 char fname[32]; | |
264 char buf[256]; | |
265 FILE *fp = NULL; | |
266 | |
267 sprintf(fname, "/proc/%d/maps", ph->pid); | |
268 fp = fopen(fname, "r"); | |
269 if (fp == NULL) { | |
270 print_debug("can't open /proc/%d/maps file\n", ph->pid); | |
271 return false; | |
272 } | |
273 | |
274 while(fgets_no_cr(buf, 256, fp)){ | |
275 char * word[6]; | |
276 int nwords = split_n_str(buf, 6, word, ' ', '\0'); | |
277 if (nwords > 5 && find_lib(ph, word[5]) == false) { | |
278 intptr_t base; | |
279 lib_info* lib; | |
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280 #ifdef _LP64 |
0 | 281 sscanf(word[0], "%lx", &base); |
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282 #else |
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283 sscanf(word[0], "%x", &base); |
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284 #endif |
0 | 285 if ((lib = add_lib_info(ph, word[5], (uintptr_t)base)) == NULL) |
286 continue; // ignore, add_lib_info prints error | |
287 | |
288 // we don't need to keep the library open, symtab is already | |
289 // built. Only for core dump we need to keep the fd open. | |
290 close(lib->fd); | |
291 lib->fd = -1; | |
292 } | |
293 } | |
294 fclose(fp); | |
295 return true; | |
296 } | |
297 | |
298 // detach a given pid | |
299 static bool ptrace_detach(pid_t pid) { | |
300 if (pid && ptrace(PTRACE_DETACH, pid, NULL, NULL) < 0) { | |
301 print_debug("ptrace(PTRACE_DETACH, ..) failed for %d\n", pid); | |
302 return false; | |
303 } else { | |
304 return true; | |
305 } | |
306 } | |
307 | |
308 // detach all pids of a ps_prochandle | |
309 static void detach_all_pids(struct ps_prochandle* ph) { | |
310 thread_info* thr = ph->threads; | |
311 while (thr) { | |
312 ptrace_detach(thr->lwp_id); | |
313 thr = thr->next; | |
314 } | |
315 } | |
316 | |
317 static void process_cleanup(struct ps_prochandle* ph) { | |
318 detach_all_pids(ph); | |
319 } | |
320 | |
321 static ps_prochandle_ops process_ops = { | |
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322 .release= process_cleanup, |
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323 .p_pread= process_read_data, |
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324 .p_pwrite= process_write_data, |
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325 .get_lwp_regs= process_get_lwp_regs |
0 | 326 }; |
327 | |
328 // attach to the process. One and only one exposed stuff | |
329 struct ps_prochandle* Pgrab(pid_t pid) { | |
330 struct ps_prochandle* ph = NULL; | |
331 thread_info* thr = NULL; | |
332 | |
333 if ( (ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle))) == NULL) { | |
334 print_debug("can't allocate memory for ps_prochandle\n"); | |
335 return NULL; | |
336 } | |
337 | |
338 if (ptrace_attach(pid) != true) { | |
339 free(ph); | |
340 return NULL; | |
341 } | |
342 | |
343 // initialize ps_prochandle | |
344 ph->pid = pid; | |
345 | |
346 // initialize vtable | |
347 ph->ops = &process_ops; | |
348 | |
349 // read library info and symbol tables, must do this before attaching threads, | |
350 // as the symbols in the pthread library will be used to figure out | |
351 // the list of threads within the same process. | |
352 read_lib_info(ph); | |
353 | |
354 // read thread info | |
355 read_thread_info(ph, add_new_thread); | |
356 | |
357 // attach to the threads | |
358 thr = ph->threads; | |
359 while (thr) { | |
360 // don't attach to the main thread again | |
361 if (ph->pid != thr->lwp_id && ptrace_attach(thr->lwp_id) != true) { | |
362 // even if one attach fails, we get return NULL | |
363 Prelease(ph); | |
364 return NULL; | |
365 } | |
366 thr = thr->next; | |
367 } | |
368 return ph; | |
369 } |