Annotation of src/usr.bin/pmdb/process.c, Revision 1.6
1.6 ! art 1: /* $OpenBSD: process.c,v 1.5 2002/06/09 04:33:42 fgsch 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>
1.4 todd 30: #include <sys/stat.h>
31:
1.6 ! art 32: #include <machine/reg.h>
! 33:
1.3 fgsch 34: #include <err.h>
35: #include <errno.h>
36: #include <signal.h>
37: #include <stdio.h>
1.1 art 38: #include <stdlib.h>
1.3 fgsch 39: #include <string.h>
1.1 art 40: #include <unistd.h>
41:
42: #include "pmdb.h"
1.6 ! art 43: #include "core.h"
1.1 art 44: #include "symbol.h"
45: #include "break.h"
46:
47: int
48: process_load(struct pstate *ps)
49: {
50: if (ps->ps_state == LOADED)
51: return (0);
1.3 fgsch 52:
53: if (access(*ps->ps_argv, R_OK|X_OK) < 0) {
54: fprintf(stderr, "%s: %s.\n", *ps->ps_argv,
55: strerror(errno));
56: return (0);
57: }
1.1 art 58:
1.4 todd 59: if (stat(ps->ps_argv[0], &(ps->exec_stat)) < 0)
60: err(1, "stat()");
61:
1.6 ! art 62: if ((ps->ps_flags & PSF_SYMBOLS) == 0) {
! 63: sym_init_exec(ps, ps->ps_argv[0]);
! 64: ps->ps_flags |= PSF_SYMBOLS;
! 65: }
! 66:
! 67: ps->ps_state = LOADED;
! 68:
1.4 todd 69: if (ps->ps_pid != 0) {
70: /* attach to an already running process */
71: if (ptrace(PT_ATTACH, ps->ps_pid, (caddr_t) 0, 0) < 0)
72: err(1, "failed to ptrace process");
73: ps->ps_state = STOPPED;
74: ps->ps_flags |= PSF_ATCH;
75: }
76:
1.6 ! art 77: return (0);
! 78: }
! 79:
! 80:
! 81: int
! 82: process_run(struct pstate *ps)
! 83: {
! 84: int status;
! 85:
! 86: if ((ps->ps_state == RUNNING) || (ps->ps_state == STOPPED)) {
! 87: warnx("process is already running");
! 88: return 0;
1.1 art 89: }
90:
1.6 ! art 91: switch (ps->ps_pid = fork()) {
! 92: case 0:
! 93: if (ptrace(PT_TRACE_ME, getpid(), NULL, 0) != 0)
! 94: err(1, "ptrace(PT_TRACE_ME)");
! 95: execvp(*ps->ps_argv, ps->ps_argv);
! 96: err(1, "exec");
! 97: /* NOTREACHED */
! 98: case -1:
! 99: err(1, "fork");
! 100: /* NOTREACHED */
! 101: default:
! 102: warnx("process started with PID %d", ps->ps_pid);
! 103: break;
1.1 art 104: }
105:
1.6 ! art 106: ps->ps_state = LOADED;
! 107:
1.1 art 108: if (wait(&status) == 0)
109: err(1, "wait");
110:
1.5 fgsch 111: return (0);
1.1 art 112: }
113:
1.6 ! art 114:
1.1 art 115: int
116: process_kill(struct pstate *ps)
117: {
118: switch(ps->ps_state) {
119: case RUNNING:
120: case STOPPED:
121: if (ptrace(PT_KILL, ps->ps_pid, NULL, 0) != 0)
122: err(1, "ptrace(PT_KILL)");
1.5 fgsch 123: return (1);
1.1 art 124: default:
1.5 fgsch 125: return (0);
1.1 art 126: }
127: }
128:
129: int
1.6 ! art 130: process_read(struct pstate *ps, off_t from, void *to, size_t size)
! 131: {
! 132: struct ptrace_io_desc piod;
! 133:
! 134: if (((ps->ps_state == NONE) || (ps->ps_state == LOADED) ||
! 135: (ps->ps_state == TERMINATED)) && (ps->ps_flags & PSF_CORE)) {
! 136: return core_read(ps, from, to, size);
! 137: }
! 138: else {
! 139: piod.piod_op = PIOD_READ_D;
! 140: piod.piod_offs = (void *)(long)from;
! 141: piod.piod_addr = to;
! 142: piod.piod_len = size;
! 143:
! 144: return (ptrace(PT_IO, ps->ps_pid, (caddr_t)&piod, 0));
! 145: }
! 146: }
! 147:
! 148: int
! 149: process_write(struct pstate *ps, off_t to, void *from, size_t size)
! 150: {
! 151: struct ptrace_io_desc piod;
! 152:
! 153: if ((ps->ps_state == NONE) && (ps->ps_flags & PSF_CORE))
! 154: return core_write(ps, to, from, size);
! 155: else {
! 156: piod.piod_op = PIOD_WRITE_D;
! 157: piod.piod_offs = (void *)(long)to;
! 158: piod.piod_addr = from;
! 159: piod.piod_len = size;
! 160:
! 161: return (ptrace(PT_IO, ps->ps_pid, (caddr_t)&piod, 0));
! 162: }
! 163: }
! 164:
! 165: int
! 166: process_getregs(struct pstate *ps, struct reg *r)
! 167: {
! 168:
! 169: if (ps->ps_state == STOPPED) {
! 170: if (ptrace(PT_GETREGS, ps->ps_pid, (caddr_t)&r, 0) != 0)
! 171: return (-1);
! 172: }
! 173: else if (ps->ps_flags & PSF_CORE) {
! 174: memcpy(r, ps->ps_core->regs, sizeof(*r));
! 175: }
! 176: else
! 177: return (-1);
! 178:
! 179: return 0;
! 180: }
! 181:
! 182: int
1.1 art 183: cmd_process_kill(int argc, char **argv, void *arg)
184: {
185: struct pstate *ps = arg;
186:
187: process_kill(ps);
188:
1.5 fgsch 189: return (1);
1.1 art 190: }
191:
192: int
193: process_bkpt_main(struct pstate *ps, void *arg)
194: {
195: sym_update(ps);
196:
1.5 fgsch 197: return (BKPT_DEL_CONT);
1.1 art 198: }
199:
200: int
201: cmd_process_run(int argc, char **argv, void *arg)
202: {
203: struct pstate *ps = arg;
204:
205: if (ps->ps_state == NONE) {
206: reg main_addr;
207:
208: process_load(ps);
209: if (sym_lookup(ps, "main", &main_addr))
210: warnx("no main");
211: else if (bkpt_add_cb(ps, main_addr, process_bkpt_main, NULL))
212: warn("no bkpt at main 0x%lx", main_addr);
213: }
214:
215: if (ps->ps_state != LOADED) {
216: fprintf(stderr, "Process already running.\n");
1.5 fgsch 217: return (0);
1.1 art 218: }
219:
1.6 ! art 220: process_run(ps);
1.1 art 221: /*
222: * XXX - there isn't really any difference between STOPPED and
223: * LOADED, we should probably get rid of one.
224: */
225: ps->ps_state = STOPPED;
226: ps->ps_signum = 0;
227:
228: return (cmd_process_cont(argc, argv, arg));
229: }
230:
231: int
232: cmd_process_cont(int argc, char **argv, void *arg)
233: {
234: struct pstate *ps = arg;
235: int signum;
236: int req = (ps->ps_flags & PSF_STEP) ? PT_STEP : PT_CONTINUE;
237:
238: if (ps->ps_state != STOPPED) {
239: fprintf(stderr, "Process not loaded and stopped %d\n",
240: ps->ps_state);
241: return (0);
242: }
243:
244: /* Catch SIGINT and SIGTRAP, pass all other signals. */
245: switch (ps->ps_signum) {
246: case SIGINT:
247: case SIGTRAP:
248: signum = 0;
249: break;
250: default:
251: signum = ps->ps_signum;
252: break;
253: }
254:
255: if (ptrace(req, ps->ps_pid, (caddr_t)ps->ps_npc, signum) != 0) {
256: err(1, "ptrace(%s)", req == PT_STEP ? "PT_STEP":"PT_CONTINUE");
257: }
258:
259: ps->ps_state = RUNNING;
260: ps->ps_npc = 1;
261:
262: return (1);
263: }
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