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/* $OpenBSD: process.c,v 1.5 2002/06/09 04:33:42 fgsch Exp $ */
/*
* Copyright (c) 2002 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pmdb.h"
#include "symbol.h"
#include "break.h"
int
process_load(struct pstate *ps)
{
int status;
if (ps->ps_state == LOADED)
return (0);
if (access(*ps->ps_argv, R_OK|X_OK) < 0) {
fprintf(stderr, "%s: %s.\n", *ps->ps_argv,
strerror(errno));
return (0);
}
if (stat(ps->ps_argv[0], &(ps->exec_stat)) < 0)
err(1, "stat()");
if (ps->ps_pid != 0) {
/* attach to an already running process */
if (ptrace(PT_ATTACH, ps->ps_pid, (caddr_t) 0, 0) < 0)
err(1, "failed to ptrace process");
ps->ps_state = STOPPED;
ps->ps_flags |= PSF_ATCH;
}
else {
switch (ps->ps_pid = fork()) {
case 0:
if (ptrace(PT_TRACE_ME, getpid(), NULL, 0) != 0)
err(1, "ptrace(PT_TRACE_ME)");
execvp(*ps->ps_argv, ps->ps_argv);
err(1, "exec");
/* NOTREACHED */
case -1:
err(1, "fork");
/* NOTREACHED */
default:
break;
}
ps->ps_state = LOADED;
}
if ((ps->ps_flags & PSF_SYMBOLS) == 0) {
sym_init_exec(ps, ps->ps_argv[0]);
ps->ps_flags |= PSF_SYMBOLS;
}
if (wait(&status) == 0)
err(1, "wait");
return (0);
}
int
process_kill(struct pstate *ps)
{
switch(ps->ps_state) {
case LOADED:
case RUNNING:
case STOPPED:
if (ptrace(PT_KILL, ps->ps_pid, NULL, 0) != 0)
err(1, "ptrace(PT_KILL)");
return (1);
default:
return (0);
}
}
int
cmd_process_kill(int argc, char **argv, void *arg)
{
struct pstate *ps = arg;
process_kill(ps);
return (1);
}
int
process_bkpt_main(struct pstate *ps, void *arg)
{
sym_update(ps);
return (BKPT_DEL_CONT);
}
int
cmd_process_run(int argc, char **argv, void *arg)
{
struct pstate *ps = arg;
if (ps->ps_state == NONE) {
reg main_addr;
process_load(ps);
if (sym_lookup(ps, "main", &main_addr))
warnx("no main");
else if (bkpt_add_cb(ps, main_addr, process_bkpt_main, NULL))
warn("no bkpt at main 0x%lx", main_addr);
}
if (ps->ps_state != LOADED) {
fprintf(stderr, "Process already running.\n");
return (0);
}
/*
* XXX - there isn't really any difference between STOPPED and
* LOADED, we should probably get rid of one.
*/
ps->ps_state = STOPPED;
ps->ps_signum = 0;
return (cmd_process_cont(argc, argv, arg));
}
int
cmd_process_cont(int argc, char **argv, void *arg)
{
struct pstate *ps = arg;
int signum;
int req = (ps->ps_flags & PSF_STEP) ? PT_STEP : PT_CONTINUE;
if (ps->ps_state != STOPPED) {
fprintf(stderr, "Process not loaded and stopped %d\n",
ps->ps_state);
return (0);
}
/* Catch SIGINT and SIGTRAP, pass all other signals. */
switch (ps->ps_signum) {
case SIGINT:
case SIGTRAP:
signum = 0;
break;
default:
signum = ps->ps_signum;
break;
}
if (ptrace(req, ps->ps_pid, (caddr_t)ps->ps_npc, signum) != 0) {
err(1, "ptrace(%s)", req == PT_STEP ? "PT_STEP":"PT_CONTINUE");
}
ps->ps_state = RUNNING;
ps->ps_npc = 1;
return (1);
}
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