Mercurial > hg > graal-compiler
annotate agent/src/os/linux/ps_proc.c @ 1681:126ea7725993
6953477: Increase portability and flexibility of building Hotspot
Summary: A collection of portability improvements including shared code support for PPC, ARM platforms, software floating point, cross compilation support and improvements in error crash detail.
Reviewed-by: phh, never, coleenp, dholmes
| author | bobv |
|---|---|
| date | Tue, 03 Aug 2010 08:13:38 -0400 |
| parents | c18cbe5936b8 |
| children | 401fbd7ff77c |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2008, 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> | |
| 28 #include <errno.h> | |
| 29 #include <sys/ptrace.h> | |
| 30 #include "libproc_impl.h" | |
| 31 | |
| 32 #if defined(x86_64) && !defined(amd64) | |
| 33 #define amd64 1 | |
| 34 #endif | |
| 35 | |
| 36 #ifndef __WALL | |
| 37 #define __WALL 0x40000000 // Copied from /usr/include/linux/wait.h | |
| 38 #endif | |
| 39 | |
| 40 // This file has the libproc implementation specific to live process | |
| 41 // For core files, refer to ps_core.c | |
| 42 | |
| 43 static inline uintptr_t align(uintptr_t ptr, size_t size) { | |
| 44 return (ptr & ~(size - 1)); | |
| 45 } | |
| 46 | |
| 47 // --------------------------------------------- | |
| 48 // ptrace functions | |
| 49 // --------------------------------------------- | |
| 50 | |
| 51 // read "size" bytes of data from "addr" within the target process. | |
| 52 // unlike the standard ptrace() function, process_read_data() can handle | |
| 53 // unaligned address - alignment check, if required, should be done | |
| 54 // before calling process_read_data. | |
| 55 | |
| 56 static bool process_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { | |
| 57 long rslt; | |
| 58 size_t i, words; | |
| 59 uintptr_t end_addr = addr + size; | |
| 60 uintptr_t aligned_addr = align(addr, sizeof(long)); | |
| 61 | |
| 62 if (aligned_addr != addr) { | |
| 63 char *ptr = (char *)&rslt; | |
| 64 errno = 0; | |
| 65 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
| 66 if (errno) { | |
| 67 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
| 68 return false; | |
| 69 } | |
| 70 for (; aligned_addr != addr; aligned_addr++, ptr++); | |
| 71 for (; ((intptr_t)aligned_addr % sizeof(long)) && aligned_addr < end_addr; | |
| 72 aligned_addr++) | |
| 73 *(buf++) = *(ptr++); | |
| 74 } | |
| 75 | |
| 76 words = (end_addr - aligned_addr) / sizeof(long); | |
| 77 | |
| 78 // assert((intptr_t)aligned_addr % sizeof(long) == 0); | |
| 79 for (i = 0; i < words; i++) { | |
| 80 errno = 0; | |
| 81 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
| 82 if (errno) { | |
| 83 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
| 84 return false; | |
| 85 } | |
| 86 *(long *)buf = rslt; | |
| 87 buf += sizeof(long); | |
| 88 aligned_addr += sizeof(long); | |
| 89 } | |
| 90 | |
| 91 if (aligned_addr != end_addr) { | |
| 92 char *ptr = (char *)&rslt; | |
| 93 errno = 0; | |
| 94 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0); | |
| 95 if (errno) { | |
| 96 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr); | |
| 97 return false; | |
| 98 } | |
| 99 for (; aligned_addr != end_addr; aligned_addr++) | |
| 100 *(buf++) = *(ptr++); | |
| 101 } | |
| 102 return true; | |
| 103 } | |
| 104 | |
| 105 // null implementation for write | |
| 106 static bool process_write_data(struct ps_prochandle* ph, | |
| 107 uintptr_t addr, const char *buf , size_t size) { | |
| 108 return false; | |
| 109 } | |
| 110 | |
| 111 // "user" should be a pointer to a user_regs_struct | |
| 112 static bool process_get_lwp_regs(struct ps_prochandle* ph, pid_t pid, struct user_regs_struct *user) { | |
| 113 // we have already attached to all thread 'pid's, just use ptrace call | |
| 114 // to get regset now. Note that we don't cache regset upfront for processes. | |
| 115 // Linux on x86 and sparc are different. On x86 ptrace(PTRACE_GETREGS, ...) | |
| 116 // uses pointer from 4th argument and ignores 3rd argument. On sparc it uses | |
| 117 // pointer from 3rd argument and ignores 4th argument | |
| 118 #if defined(sparc) || defined(sparcv9) | |
| 119 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, addr, data) | |
| 120 #else | |
| 121 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, data, addr) | |
| 122 #endif | |
| 123 | |
| 124 #ifdef _LP64 | |
| 125 #ifdef PTRACE_GETREGS64 | |
| 126 #define PTRACE_GETREGS_REQ PTRACE_GETREGS64 | |
| 127 #endif | |
| 128 #else | |
| 129 #if defined(PTRACE_GETREGS) || defined(PT_GETREGS) | |
| 130 #define PTRACE_GETREGS_REQ PTRACE_GETREGS | |
| 131 #endif | |
| 132 #endif /* _LP64 */ | |
| 133 | |
| 134 #ifdef PTRACE_GETREGS_REQ | |
| 135 if (ptrace_getregs(PTRACE_GETREGS_REQ, pid, user, NULL) < 0) { | |
| 136 print_debug("ptrace(PTRACE_GETREGS, ...) failed for lwp %d\n", pid); | |
| 137 return false; | |
| 138 } | |
| 139 return true; | |
| 140 #else | |
| 141 print_debug("ptrace(PTRACE_GETREGS, ...) not supported\n"); | |
| 142 return false; | |
| 143 #endif | |
| 144 | |
| 145 } | |
| 146 | |
| 147 // attach to a process/thread specified by "pid" | |
| 148 static bool ptrace_attach(pid_t pid) { | |
| 149 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) { | |
| 150 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid); | |
| 151 return false; | |
| 152 } else { | |
| 153 int ret; | |
| 154 int status; | |
| 155 do { | |
| 156 // Wait for debuggee to stop. | |
| 157 ret = waitpid(pid, &status, 0); | |
| 158 if (ret == -1 && errno == ECHILD) { | |
| 159 // try cloned process. | |
| 160 ret = waitpid(pid, &status, __WALL); | |
| 161 } | |
| 162 if (ret >= 0) { | |
| 163 if (WIFSTOPPED(status)) { | |
| 164 // Debuggee stopped. | |
| 165 return true; | |
| 166 } else { | |
| 167 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status); | |
| 168 return false; | |
| 169 } | |
| 170 } else { | |
| 171 switch (errno) { | |
| 172 case EINTR: | |
| 173 continue; | |
| 174 break; | |
| 175 case ECHILD: | |
| 176 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid); | |
| 177 break; | |
| 178 case EINVAL: | |
| 179 print_debug("waitpid() failed. Invalid options argument.\n"); | |
| 180 break; | |
| 181 default: | |
| 182 print_debug("waitpid() failed. Unexpected error %d\n",errno); | |
| 183 } | |
| 184 return false; | |
| 185 } | |
| 186 } while(true); | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 // ------------------------------------------------------- | |
| 191 // functions for obtaining library information | |
| 192 // ------------------------------------------------------- | |
| 193 | |
| 194 /* | |
| 195 * splits a string _str_ into substrings with delimiter _delim_ by replacing old * delimiters with _new_delim_ (ideally, '\0'). the address of each substring | |
| 196 * is stored in array _ptrs_ as the return value. the maximum capacity of _ptrs_ * array is specified by parameter _n_. | |
| 197 * RETURN VALUE: total number of substrings (always <= _n_) | |
| 198 * NOTE: string _str_ is modified if _delim_!=_new_delim_ | |
| 199 */ | |
| 200 static int split_n_str(char * str, int n, char ** ptrs, char delim, char new_delim) | |
| 201 { | |
| 202 int i; | |
| 203 for(i = 0; i < n; i++) ptrs[i] = NULL; | |
| 204 if (str == NULL || n < 1 ) return 0; | |
| 205 | |
| 206 i = 0; | |
| 207 | |
| 208 // skipping leading blanks | |
| 209 while(*str&&*str==delim) str++; | |
| 210 | |
| 211 while(*str&&i<n){ | |
| 212 ptrs[i++] = str; | |
| 213 while(*str&&*str!=delim) str++; | |
| 214 while(*str&&*str==delim) *(str++) = new_delim; | |
| 215 } | |
| 216 | |
| 217 return i; | |
| 218 } | |
| 219 | |
| 220 /* | |
| 221 * fgets without storing '\n' at the end of the string | |
| 222 */ | |
| 223 static char * fgets_no_cr(char * buf, int n, FILE *fp) | |
| 224 { | |
| 225 char * rslt = fgets(buf, n, fp); | |
| 226 if (rslt && buf && *buf){ | |
| 227 char *p = strchr(buf, '\0'); | |
| 228 if (*--p=='\n') *p='\0'; | |
| 229 } | |
| 230 return rslt; | |
| 231 } | |
| 232 | |
| 233 // callback for read_thread_info | |
| 234 static bool add_new_thread(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) { | |
| 235 return add_thread_info(ph, pthread_id, lwp_id) != NULL; | |
| 236 } | |
| 237 | |
| 238 static bool read_lib_info(struct ps_prochandle* ph) { | |
| 239 char fname[32]; | |
| 240 char buf[256]; | |
| 241 FILE *fp = NULL; | |
| 242 | |
| 243 sprintf(fname, "/proc/%d/maps", ph->pid); | |
| 244 fp = fopen(fname, "r"); | |
| 245 if (fp == NULL) { | |
| 246 print_debug("can't open /proc/%d/maps file\n", ph->pid); | |
| 247 return false; | |
| 248 } | |
| 249 | |
| 250 while(fgets_no_cr(buf, 256, fp)){ | |
| 251 char * word[6]; | |
| 252 int nwords = split_n_str(buf, 6, word, ' ', '\0'); | |
| 253 if (nwords > 5 && find_lib(ph, word[5]) == false) { | |
| 254 intptr_t base; | |
| 255 lib_info* lib; | |
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256 #ifdef _LP64 |
| 0 | 257 sscanf(word[0], "%lx", &base); |
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258 #else |
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259 sscanf(word[0], "%x", &base); |
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260 #endif |
| 0 | 261 if ((lib = add_lib_info(ph, word[5], (uintptr_t)base)) == NULL) |
| 262 continue; // ignore, add_lib_info prints error | |
| 263 | |
| 264 // we don't need to keep the library open, symtab is already | |
| 265 // built. Only for core dump we need to keep the fd open. | |
| 266 close(lib->fd); | |
| 267 lib->fd = -1; | |
| 268 } | |
| 269 } | |
| 270 fclose(fp); | |
| 271 return true; | |
| 272 } | |
| 273 | |
| 274 // detach a given pid | |
| 275 static bool ptrace_detach(pid_t pid) { | |
| 276 if (pid && ptrace(PTRACE_DETACH, pid, NULL, NULL) < 0) { | |
| 277 print_debug("ptrace(PTRACE_DETACH, ..) failed for %d\n", pid); | |
| 278 return false; | |
| 279 } else { | |
| 280 return true; | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 // detach all pids of a ps_prochandle | |
| 285 static void detach_all_pids(struct ps_prochandle* ph) { | |
| 286 thread_info* thr = ph->threads; | |
| 287 while (thr) { | |
| 288 ptrace_detach(thr->lwp_id); | |
| 289 thr = thr->next; | |
| 290 } | |
| 291 } | |
| 292 | |
| 293 static void process_cleanup(struct ps_prochandle* ph) { | |
| 294 detach_all_pids(ph); | |
| 295 } | |
| 296 | |
| 297 static ps_prochandle_ops process_ops = { | |
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298 .release= process_cleanup, |
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299 .p_pread= process_read_data, |
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300 .p_pwrite= process_write_data, |
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301 .get_lwp_regs= process_get_lwp_regs |
| 0 | 302 }; |
| 303 | |
| 304 // attach to the process. One and only one exposed stuff | |
| 305 struct ps_prochandle* Pgrab(pid_t pid) { | |
| 306 struct ps_prochandle* ph = NULL; | |
| 307 thread_info* thr = NULL; | |
| 308 | |
| 309 if ( (ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle))) == NULL) { | |
| 310 print_debug("can't allocate memory for ps_prochandle\n"); | |
| 311 return NULL; | |
| 312 } | |
| 313 | |
| 314 if (ptrace_attach(pid) != true) { | |
| 315 free(ph); | |
| 316 return NULL; | |
| 317 } | |
| 318 | |
| 319 // initialize ps_prochandle | |
| 320 ph->pid = pid; | |
| 321 | |
| 322 // initialize vtable | |
| 323 ph->ops = &process_ops; | |
| 324 | |
| 325 // read library info and symbol tables, must do this before attaching threads, | |
| 326 // as the symbols in the pthread library will be used to figure out | |
| 327 // the list of threads within the same process. | |
| 328 read_lib_info(ph); | |
| 329 | |
| 330 // read thread info | |
| 331 read_thread_info(ph, add_new_thread); | |
| 332 | |
| 333 // attach to the threads | |
| 334 thr = ph->threads; | |
| 335 while (thr) { | |
| 336 // don't attach to the main thread again | |
| 337 if (ph->pid != thr->lwp_id && ptrace_attach(thr->lwp_id) != true) { | |
| 338 // even if one attach fails, we get return NULL | |
| 339 Prelease(ph); | |
| 340 return NULL; | |
| 341 } | |
| 342 thr = thr->next; | |
| 343 } | |
| 344 return ph; | |
| 345 } |