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1.9 ! fgsch 1: /* $OpenBSD: pmdb.c,v 1.8 2002/06/09 02:44:13 todd 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 *);
48: static int cmd_quit(int, char **, void *);
49:
50: struct clit cmds[] = {
51: /* debugging info commands. */
52: { "regs", "show registers", 0, 0, cmd_show_registers, (void *)-1 },
53: { "trace", "show backtrace", 0, 0, cmd_show_backtrace, (void *)-1 },
54:
55: /* Process handling commands. */
56: { "run", "run process", 0, 0, cmd_process_run, (void *)-1 },
57: { "continue", "continue process", 0, 0, cmd_process_cont, (void *)-1 },
58: { "kill", "kill process", 0, 0, cmd_process_kill, (void *)-1 },
59:
60: /* signal handling commands. */
61: { "signal", "ignore signal", 2, 2, cmd_signal_ignore, (void *)-1 },
62: { "sigstate", "show signal state", 0, 0, cmd_signal_show, (void *)-1 },
63:
64: /* breakpoints */
65: { "break", "set breakpoint", 1, 1, cmd_bkpt_add, (void *)-1 },
66: { "step", "single step one insn", 0, 0, cmd_sstep, (void *)-1 },
1.3 art 67:
68: /* symbols */
69: { "sym_load", "load symbol table", 2, 2, cmd_sym_load, (void *)-1 },
1.1 art 70:
71: /* misc commands. */
72: { "help", "print help", 0, 1, cmd_help, NULL },
73: { "quit", "quit", 0, 0, cmd_quit, (void *)-1 },
74: { "exit", "quit", 0, 0, cmd_quit, (void *)-1 },
75: };
76:
1.6 fgsch 77: #define NCMDS sizeof(cmds)/sizeof(cmds[0])
78:
1.7 fgsch 79: void
80: usage()
81: {
82: extern char *__progname;
83:
1.9 ! fgsch 84: fprintf(stderr, "Usage: %s [-c core] [-p pid] <program> args\n",
! 85: __progname);
1.7 fgsch 86: exit(1);
87: }
88:
1.1 art 89: int
90: main(int argc, char **argv)
91: {
92: struct pstate ps;
1.7 fgsch 93: int i, c;
1.1 art 94: int status;
95: void *cm;
1.8 todd 96: char *pmenv, *core, *perr;
1.1 art 97: int level;
1.8 todd 98: pid_t pid;
1.1 art 99:
100: if (argc < 2) {
1.7 fgsch 101: usage();
1.1 art 102: }
103:
1.7 fgsch 104: core = NULL;
1.8 todd 105: pid = 0;
1.7 fgsch 106:
1.9 ! fgsch 107: while ((c = getopt(argc, argv, "c:p:")) != -1) {
1.7 fgsch 108: switch(c) {
109: case 'c':
110: core = optarg;
111: break;
1.8 todd 112: case 'p':
113: pid = (pid_t) strtol(optarg, &perr, 10);
1.9 ! fgsch 114: if (*perr != '\0')
1.8 todd 115: errx(1, "invalid PID");
116: break;
1.7 fgsch 117: case '?':
118: default:
119: usage();
120: /* NOTREACHED */
121: }
122: }
123: argc -= optind;
124: argv += optind;
125:
1.1 art 126: if ((pmenv = getenv("IN_PMDB")) != NULL) {
127: level = atoi(pmenv);
128: level++;
129: } else
130: level = 0;
131:
132: if (level > 0)
133: asprintf(&prompt_add, "(%d)", level);
134: asprintf(&pmenv, "%d", level);
135: setenv("IN_PMDB", pmenv, 1);
136:
1.8 todd 137: ps.ps_pid = pid;
1.1 art 138: ps.ps_state = NONE;
1.7 fgsch 139: ps.ps_argc = argc;
140: ps.ps_argv = argv;
1.1 art 141: ps.ps_flags = 0;
142: ps.ps_signum = 0;
143: ps.ps_npc = 1;
144: TAILQ_INIT(&ps.ps_bkpts);
145: TAILQ_INIT(&ps.ps_sstep_cbs);
146:
147: signal(SIGINT, SIG_IGN);
148:
1.6 fgsch 149: for (i = 0; i < NCMDS; i++)
1.1 art 150: if (cmds[i].arg == (void *)-1)
151: cmds[i].arg = &ps;
152:
153: md_def_init();
154: init_sigstate(&ps);
155:
156: process_load(&ps);
157:
1.7 fgsch 158: if (core != NULL)
159: read_core(core, &ps);
160:
1.6 fgsch 161: cm = cmdinit(cmds, NCMDS);
1.1 art 162: while (ps.ps_state != TERMINATED) {
163: int signum;
164: int stopped;
165: int cont;
166:
167: if (ps.ps_state == STOPPED) {
168: sym_update(&ps);
169: }
170:
171: if (ps.ps_state != RUNNING && cmdloop(cm) == 0) {
172: cmd_quit(0, NULL, &ps);
173: }
174:
175: if (ps.ps_state == TERMINATED)
176: break;
177:
178: if (wait(&status) == 0)
179: err(1, "wait");
180: if (WIFEXITED(status)) {
181: if ((ps.ps_flags & PSF_KILL) == 0) {
182: ps.ps_state = NONE;
183: } else {
184: ps.ps_state = TERMINATED;
185: }
186: fprintf(stderr, "process exited with status %d\n",
187: WEXITSTATUS(status));
188: continue;
189: }
190: if (WIFSIGNALED(status)) {
191: signum = WTERMSIG(status);
192: stopped = 0;
193: } else {
194: signum = WSTOPSIG(status);
195: stopped = 1;
196: }
197: cont = 0;
198: if (stopped)
199: cont = bkpt_check(&ps);
200: process_signal(&ps, signum, stopped, cont);
201: }
202:
203: cmdend(cm);
204:
205: sym_destroy(&ps);
206:
207: return (0);
208: }
209:
210: /* XXX - move to some other file. */
211: int
212: read_from_pid(pid_t pid, off_t from, void *to, size_t size)
213: {
214: struct ptrace_io_desc piod;
215:
216: piod.piod_op = PIOD_READ_D;
217: piod.piod_offs = (void *)(long)from;
218: piod.piod_addr = to;
219: piod.piod_len = size;
220:
1.4 art 221: return (ptrace(PT_IO, pid, (caddr_t)&piod, 0));
1.1 art 222: }
223:
224:
225: int
226: write_to_pid(pid_t pid, off_t to, void *from, size_t size)
227: {
228: struct ptrace_io_desc piod;
229:
230: piod.piod_op = PIOD_WRITE_D;
231: piod.piod_offs = (void *)(long)to;
232: piod.piod_addr = from;
233: piod.piod_len = size;
234:
1.4 art 235: return (ptrace(PT_IO, pid, (caddr_t)&piod, 0));
1.1 art 236: }
237:
238: static int
239: cmd_show_registers(int argc, char **argv, void *arg)
240: {
241: struct pstate *ps = arg;
242: char buf[256];
243: int i;
244: reg *rg;
245:
246: if (ps->ps_state != STOPPED) {
1.7 fgsch 247: if (ps->ps_flags & PSF_CORE) {
248: /* dump registers from core */
249: core_printregs(ps->ps_core);
250: return (0);
251: }
1.1 art 252: fprintf(stderr, "process not stopped\n");
1.7 fgsch 253: return (0);
1.1 art 254: }
255:
256: rg = alloca(sizeof(*rg) * md_def.nregs);
257:
258: if (md_getregs(ps, rg))
259: err(1, "can't get registers");
260: for (i = 0; i < md_def.nregs; i++)
261: printf("%s:\t0x%.*lx\t%s\n", md_def.md_reg_names[i],
262: (int)(sizeof(reg) * 2), (long)rg[i],
263: sym_print(ps, rg[i], buf, sizeof(buf)));
1.7 fgsch 264: return (0);
1.1 art 265: }
266:
267: static int
268: cmd_show_backtrace(int argc, char **argv, void *arg)
269: {
270: struct pstate *ps = arg;
271: int i;
272:
273: if (ps->ps_state != STOPPED) {
274: fprintf(stderr, "process not stopped\n");
1.7 fgsch 275: return (0);
1.1 art 276: }
277:
278: /* no more than 100 frames */
279: for (i = 0; i < 100; i++) {
280: struct md_frame mfr;
281: char namebuf[1024], *name;
282: reg offs;
283: int j;
284:
285: mfr.nargs = -1;
286:
287: if (md_getframe(ps, i, &mfr))
288: break;
289:
290: name = sym_name_and_offset(ps, mfr.pc, namebuf,
291: sizeof(namebuf), &offs);
292: if (name == NULL) {
293: snprintf(namebuf, sizeof(namebuf), "0x%lx", mfr.pc);
294: name = namebuf;
1.5 drahn 295: offs = 0;
1.1 art 296: }
297:
298: printf("%s(", name);
299: for (j = 0; j < mfr.nargs; j++) {
300: printf("0x%lx", mfr.args[j]);
301: if (j < mfr.nargs - 1)
302: printf(", ");
303: }
1.5 drahn 304: if (offs == 0) {
1.6 fgsch 305: printf(")\n");
1.5 drahn 306: } else {
307: printf(")+0x%lx\n", offs);
308: }
1.1 art 309: }
1.7 fgsch 310:
311: return (0);
1.1 art 312: }
313:
314: static int
315: cmd_quit(int argc, char **argv, void *arg)
316: {
317: struct pstate *ps = arg;
318:
1.8 todd 319: if ((ps->ps_flags & PSF_ATCH)) {
320: if ((ps->ps_flags & PSF_ATCH) &&
321: ptrace(PT_DETACH, ps->ps_pid, NULL, 0) < 0)
322: err(1, "ptrace(PT_DETACH)");
323: } else {
324: ps->ps_flags |= PSF_KILL;
1.1 art 325:
1.8 todd 326: if (process_kill(ps))
1.9 ! fgsch 327: return (1);
1.8 todd 328: }
1.1 art 329:
330: ps->ps_state = TERMINATED;
1.9 ! fgsch 331: return (1);
1.1 art 332: }
333:
334: /*
335: * Perform command completion.
336: * Pretty simple. if there are spaces in "buf", the last string is a symbol
337: * otherwise it's a command.
338: */
339: int
340: cmd_complt(char *buf, size_t buflen)
341: {
342: struct clit *match;
343: char *start;
344: int command;
345: int i, j, len;
346: int onlymatch;
347:
348: command = (strchr(buf, ' ') == NULL);
349:
350: if (!command) {
351: /* XXX - can't handle symbols yet. */
1.9 ! fgsch 352: return (-1);
1.1 art 353: }
354:
355: start = buf;
356: len = strlen(buf);
357:
358: match = NULL;
359: for (i = 0; i < sizeof(cmds) / sizeof(cmds[i]); i++) {
360: if (strncmp(start, cmds[i].cmd, len) == 0) {
361: struct clit *cmdp;
362:
363: cmdp = &cmds[i];
364: if (match == NULL) {
365: onlymatch = 1;
366: match = cmdp;
367: strlcpy(buf, match->cmd, buflen);
368: continue;
369: }
370: onlymatch = 0;
371: for (j = len; j < buflen; j++) {
372: if (buf[j] != cmdp->cmd[j]) {
373: buf[j] = '\0';
374: break;
375: }
376: if (cmdp->cmd[j] == '\0')
377: break;
378: }
379: }
380: }
381:
382: /*
383: * Be nice. If there could be arguments for this command and it's
384: * the only match append a space.
385: */
386: if (match && onlymatch /*&& match->maxargc > 0*/)
387: strlcat(buf, " ", buflen);
388:
389: return (match && onlymatch) ? 0 : -1;
390: }
391:
392: /*
1.7 fgsch 393: * The "standard" wrapper
1.1 art 394: */
395: void *
396: emalloc(size_t sz)
397: {
398: void *ret;
399: if ((ret = malloc(sz)) == NULL)
400: err(1, "malloc");
401: return (ret);
402: }