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1.17 ! deraadt 1: /* $OpenBSD: pmdb.c,v 1.16 2003/05/15 00:11:03 jfb Exp $ */
1.1 art 2: /*
3: * Copyright (c) 2002 Artur Grabowski <art@openbsd.org>
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: *
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. The name of the author may not be used to endorse or promote products
13: * derived from this software without specific prior written permission.
14: *
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include <sys/types.h>
28: #include <sys/ptrace.h>
29: #include <sys/wait.h>
1.7 fgsch 30: #include <sys/endian.h>
1.1 art 31:
32: #include <stdlib.h>
33: #include <stdio.h>
34: #include <unistd.h>
35: #include <signal.h>
36: #include <err.h>
37: #include <errno.h>
38: #include <string.h>
39:
40: #include "pmdb.h"
41: #include "symbol.h"
42: #include "clit.h"
43: #include "break.h"
1.7 fgsch 44: #include "core.h"
1.1 art 45:
46: static int cmd_show_registers(int, char **, void *);
47: static int cmd_show_backtrace(int, char **, void *);
1.14 mickey 48: static int cmd_examine(int, char **, void *);
1.1 art 49: static int cmd_quit(int, char **, void *);
50:
51: struct clit cmds[] = {
52: /* debugging info commands. */
53: { "regs", "show registers", 0, 0, cmd_show_registers, (void *)-1 },
54: { "trace", "show backtrace", 0, 0, cmd_show_backtrace, (void *)-1 },
1.14 mickey 55: { "x", "examine memory", 1, 16, cmd_examine, (void *)-1 },
1.1 art 56:
57: /* Process handling commands. */
58: { "run", "run process", 0, 0, cmd_process_run, (void *)-1 },
59: { "continue", "continue process", 0, 0, cmd_process_cont, (void *)-1 },
60: { "kill", "kill process", 0, 0, cmd_process_kill, (void *)-1 },
1.12 art 61: { "setenv", "set env variables", 2, 2, cmd_process_setenv, (void *)-1 },
1.1 art 62:
63: /* signal handling commands. */
64: { "signal", "ignore signal", 2, 2, cmd_signal_ignore, (void *)-1 },
65: { "sigstate", "show signal state", 0, 0, cmd_signal_show, (void *)-1 },
66:
67: /* breakpoints */
68: { "break", "set breakpoint", 1, 1, cmd_bkpt_add, (void *)-1 },
69: { "step", "single step one insn", 0, 0, cmd_sstep, (void *)-1 },
1.3 art 70:
71: /* symbols */
72: { "sym_load", "load symbol table", 2, 2, cmd_sym_load, (void *)-1 },
1.1 art 73:
74: /* misc commands. */
75: { "help", "print help", 0, 1, cmd_help, NULL },
76: { "quit", "quit", 0, 0, cmd_quit, (void *)-1 },
77: { "exit", "quit", 0, 0, cmd_quit, (void *)-1 },
78: };
79:
1.6 fgsch 80: #define NCMDS sizeof(cmds)/sizeof(cmds[0])
81:
1.7 fgsch 82: void
1.17 ! deraadt 83: usage(void)
1.7 fgsch 84: {
85: extern char *__progname;
86:
1.9 fgsch 87: fprintf(stderr, "Usage: %s [-c core] [-p pid] <program> args\n",
88: __progname);
1.7 fgsch 89: exit(1);
90: }
91:
1.1 art 92: int
93: main(int argc, char **argv)
94: {
95: struct pstate ps;
1.7 fgsch 96: int i, c;
1.1 art 97: int status;
98: void *cm;
1.8 todd 99: char *pmenv, *core, *perr;
1.1 art 100: int level;
1.8 todd 101: pid_t pid;
1.1 art 102:
1.7 fgsch 103: core = NULL;
1.8 todd 104: pid = 0;
1.7 fgsch 105:
1.9 fgsch 106: while ((c = getopt(argc, argv, "c:p:")) != -1) {
1.7 fgsch 107: switch(c) {
108: case 'c':
109: core = optarg;
110: break;
1.8 todd 111: case 'p':
112: pid = (pid_t) strtol(optarg, &perr, 10);
1.9 fgsch 113: if (*perr != '\0')
1.8 todd 114: errx(1, "invalid PID");
115: break;
1.7 fgsch 116: case '?':
117: default:
118: usage();
119: /* NOTREACHED */
120: }
121: }
122: argc -= optind;
123: argv += optind;
1.11 fgsch 124:
125: if (argc == 0)
126: usage();
1.7 fgsch 127:
1.1 art 128: if ((pmenv = getenv("IN_PMDB")) != NULL) {
129: level = atoi(pmenv);
130: level++;
131: } else
132: level = 0;
133:
134: if (level > 0)
135: asprintf(&prompt_add, "(%d)", level);
136: asprintf(&pmenv, "%d", level);
137: setenv("IN_PMDB", pmenv, 1);
1.15 pvalchev 138: if (pmenv)
139: free(pmenv);
1.1 art 140:
1.8 todd 141: ps.ps_pid = pid;
1.1 art 142: ps.ps_state = NONE;
1.7 fgsch 143: ps.ps_argc = argc;
144: ps.ps_argv = argv;
1.1 art 145: ps.ps_flags = 0;
146: ps.ps_signum = 0;
147: ps.ps_npc = 1;
148: TAILQ_INIT(&ps.ps_bkpts);
149: TAILQ_INIT(&ps.ps_sstep_cbs);
150:
151: signal(SIGINT, SIG_IGN);
152:
1.6 fgsch 153: for (i = 0; i < NCMDS; i++)
1.1 art 154: if (cmds[i].arg == (void *)-1)
155: cmds[i].arg = &ps;
156:
157: md_def_init();
158: init_sigstate(&ps);
159:
1.10 art 160: if ((core != NULL) && (read_core(core, &ps) < 0))
161: warnx("failed to load core file");
1.1 art 162:
1.10 art 163: if (process_load(&ps) < 0)
164: errx(1, "failed to load process");
1.7 fgsch 165:
1.6 fgsch 166: cm = cmdinit(cmds, NCMDS);
1.1 art 167: while (ps.ps_state != TERMINATED) {
168: int signum;
169: int stopped;
170: int cont;
171:
172: if (ps.ps_state == STOPPED) {
173: sym_update(&ps);
174: }
175:
176: if (ps.ps_state != RUNNING && cmdloop(cm) == 0) {
177: cmd_quit(0, NULL, &ps);
178: }
179:
180: if (ps.ps_state == TERMINATED)
181: break;
182:
183: if (wait(&status) == 0)
184: err(1, "wait");
185: if (WIFEXITED(status)) {
186: if ((ps.ps_flags & PSF_KILL) == 0) {
187: ps.ps_state = NONE;
188: } else {
189: ps.ps_state = TERMINATED;
190: }
191: fprintf(stderr, "process exited with status %d\n",
192: WEXITSTATUS(status));
193: continue;
194: }
195: if (WIFSIGNALED(status)) {
196: signum = WTERMSIG(status);
197: stopped = 0;
198: } else {
199: signum = WSTOPSIG(status);
200: stopped = 1;
201: }
202: cont = 0;
203: if (stopped)
204: cont = bkpt_check(&ps);
205: process_signal(&ps, signum, stopped, cont);
206: }
207:
208: cmdend(cm);
209:
210: sym_destroy(&ps);
211:
212: return (0);
213: }
214:
215:
216: static int
217: cmd_show_registers(int argc, char **argv, void *arg)
218: {
219: struct pstate *ps = arg;
220: char buf[256];
221: int i;
222: reg *rg;
223:
224: if (ps->ps_state != STOPPED) {
1.7 fgsch 225: if (ps->ps_flags & PSF_CORE) {
226: /* dump registers from core */
1.13 mickey 227: core_printregs(ps);
1.7 fgsch 228: return (0);
229: }
1.1 art 230: fprintf(stderr, "process not stopped\n");
1.7 fgsch 231: return (0);
1.1 art 232: }
233:
234: rg = alloca(sizeof(*rg) * md_def.nregs);
235:
236: if (md_getregs(ps, rg))
237: err(1, "can't get registers");
238: for (i = 0; i < md_def.nregs; i++)
239: printf("%s:\t0x%.*lx\t%s\n", md_def.md_reg_names[i],
240: (int)(sizeof(reg) * 2), (long)rg[i],
241: sym_print(ps, rg[i], buf, sizeof(buf)));
1.7 fgsch 242: return (0);
1.1 art 243: }
244:
245: static int
246: cmd_show_backtrace(int argc, char **argv, void *arg)
247: {
248: struct pstate *ps = arg;
249: int i;
250:
1.10 art 251: if (ps->ps_state != STOPPED && !(ps->ps_flags & PSF_CORE)) {
1.1 art 252: fprintf(stderr, "process not stopped\n");
1.7 fgsch 253: return (0);
1.1 art 254: }
255:
256: /* no more than 100 frames */
257: for (i = 0; i < 100; i++) {
258: struct md_frame mfr;
259: char namebuf[1024], *name;
260: reg offs;
261: int j;
262:
263: mfr.nargs = -1;
264:
265: if (md_getframe(ps, i, &mfr))
266: break;
267:
268: name = sym_name_and_offset(ps, mfr.pc, namebuf,
269: sizeof(namebuf), &offs);
270: if (name == NULL) {
271: snprintf(namebuf, sizeof(namebuf), "0x%lx", mfr.pc);
272: name = namebuf;
1.5 drahn 273: offs = 0;
1.1 art 274: }
275:
276: printf("%s(", name);
277: for (j = 0; j < mfr.nargs; j++) {
278: printf("0x%lx", mfr.args[j]);
279: if (j < mfr.nargs - 1)
280: printf(", ");
281: }
1.5 drahn 282: if (offs == 0) {
1.6 fgsch 283: printf(")\n");
1.5 drahn 284: } else {
285: printf(")+0x%lx\n", offs);
286: }
1.1 art 287: }
1.7 fgsch 288:
289: return (0);
1.1 art 290: }
291:
292: static int
293: cmd_quit(int argc, char **argv, void *arg)
294: {
295: struct pstate *ps = arg;
296:
1.8 todd 297: if ((ps->ps_flags & PSF_ATCH)) {
298: if ((ps->ps_flags & PSF_ATCH) &&
299: ptrace(PT_DETACH, ps->ps_pid, NULL, 0) < 0)
300: err(1, "ptrace(PT_DETACH)");
301: } else {
302: ps->ps_flags |= PSF_KILL;
1.1 art 303:
1.8 todd 304: if (process_kill(ps))
1.9 fgsch 305: return (1);
1.8 todd 306: }
1.1 art 307:
308: ps->ps_state = TERMINATED;
1.9 fgsch 309: return (1);
1.14 mickey 310: }
311:
312: static int
313: cmd_examine(int argc, char **argv, void *arg)
314: {
315: struct pstate *ps = arg;
316: char buf[256];
317: reg addr, val;
318: int i;
319:
320: for (i = 1; argv[i]; i++) {
321:
322: addr = strtoul(argv[i], NULL, 0);
323: if (!addr) { /* assume it's a symbol */
324: if (sym_lookup(ps, argv[i], &addr)) {
325: warn( "Can't find: %s", argv[i]);
326: return (0);
327: }
328: }
329:
330: if (process_read(ps, addr, &val, sizeof(val))) {
331: warn("Can't read process contents at 0x%lx", addr);
332: return (0);
333: }
334:
335: printf("%s:\t%s\n", argv[i],
336: sym_print(ps, val, buf, sizeof(buf)));
337: }
338:
339: return (0);
1.1 art 340: }
341:
342: /*
343: * Perform command completion.
344: * Pretty simple. if there are spaces in "buf", the last string is a symbol
345: * otherwise it's a command.
346: */
347: int
348: cmd_complt(char *buf, size_t buflen)
349: {
350: struct clit *match;
351: char *start;
352: int command;
353: int i, j, len;
354: int onlymatch;
355:
356: command = (strchr(buf, ' ') == NULL);
357:
358: if (!command) {
359: /* XXX - can't handle symbols yet. */
1.9 fgsch 360: return (-1);
1.1 art 361: }
362:
363: start = buf;
364: len = strlen(buf);
365:
366: match = NULL;
367: for (i = 0; i < sizeof(cmds) / sizeof(cmds[i]); i++) {
368: if (strncmp(start, cmds[i].cmd, len) == 0) {
369: struct clit *cmdp;
370:
371: cmdp = &cmds[i];
372: if (match == NULL) {
373: onlymatch = 1;
374: match = cmdp;
375: strlcpy(buf, match->cmd, buflen);
376: continue;
377: }
378: onlymatch = 0;
379: for (j = len; j < buflen; j++) {
380: if (buf[j] != cmdp->cmd[j]) {
381: buf[j] = '\0';
382: break;
383: }
384: if (cmdp->cmd[j] == '\0')
385: break;
386: }
387: }
388: }
389:
390: /*
391: * Be nice. If there could be arguments for this command and it's
392: * the only match append a space.
393: */
394: if (match && onlymatch /*&& match->maxargc > 0*/)
395: strlcat(buf, " ", buflen);
396:
397: return (match && onlymatch) ? 0 : -1;
398: }
399:
400: /*
1.7 fgsch 401: * The "standard" wrapper
1.1 art 402: */
403: void *
404: emalloc(size_t sz)
405: {
406: void *ret;
407: if ((ret = malloc(sz)) == NULL)
408: err(1, "malloc");
409: return (ret);
410: }