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/* $OpenBSD: core.c,v 1.8 2007/08/01 15:44:37 deraadt Exp $ */
/*
* Copyright (c) 2002 Jean-Francois Brousseau <krapht@secureops.com>
* 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/param.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <err.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include "core.h"
#include "pmdb.h"
#include "symbol.h"
int
read_core(const char *path, struct pstate *ps)
{
struct corefile *cf;
void *core_map;
off_t c_off;
int i, cfd;
cf = (struct corefile *)malloc(sizeof(*cf));
if (cf == NULL)
err(1, "malloc");
cfd = open(path, O_RDONLY, 0600);
if (cfd < 0)
err(1, "open() failed on core file");
if (fstat(cfd, &(cf->cfstat)) < 0)
err(1, "fstat() failed on core");
if (cf->cfstat.st_mtimespec.tv_sec < ps->exec_stat.st_mtimespec.tv_sec)
warnx("executable is more recent than core file!");
core_map = mmap(NULL, cf->cfstat.st_size, PROT_READ, MAP_PRIVATE,
cfd, 0);
if (core_map == MAP_FAILED)
err(1, "mmap() failed on core");
close(cfd);
cf->chdr = (struct core *)core_map;
c_off = cf->chdr->c_hdrsize;
if (CORE_GETMAGIC(*(cf->chdr)) != COREMAGIC)
errx(1, "hey, that's not a core file");
printf("Core file generated from '%s' by signal %d (SIG%s)\n",
cf->chdr->c_name, cf->chdr->c_signo,
sys_signame[cf->chdr->c_signo]);
#ifdef DEBUG
printf("Core: text=0x%lx, data=0x%lx, stack=0x%lx\n",
cf->chdr->c_tsize, cf->chdr->c_dsize, cf->chdr->c_ssize);
#endif
cf->segs = (struct coreseg **)calloc(cf->chdr->c_nseg,
sizeof(cf->segs));
if (cf->segs == NULL)
err(1, "calloc");
for (i = 0; i < cf->chdr->c_nseg; i++) {
cf->segs[i] = (struct coreseg *)(core_map + c_off);
if (CORE_GETMAGIC(*(cf->segs[i])) != CORESEGMAGIC)
errx(1, "invalid segment hdr for segment %d", i);
if (CORE_GETFLAG(*(cf->segs[i])) & CORE_CPU) {
cf->regs = (struct reg *)
((long) cf->segs[i] + cf->chdr->c_seghdrsize);
}
if (CORE_GETFLAG(*(cf->segs[i])) & CORE_STACK)
cf->c_stack = cf->segs[i] + cf->chdr->c_seghdrsize;
c_off += cf->chdr->c_seghdrsize + cf->segs[i]->c_size;
#ifdef DEBUG
(void)printf("seg[%d]: midmag=0x%lx addr=0x%lx size=0x%lx\n",
i, cf->segs[i]->c_midmag, cf->segs[i]->c_addr,
cf->segs[i]->c_size);
#endif
}
cf->path = (char *)path;
ps->ps_flags |= PSF_CORE;
ps->ps_core = cf;
return (0);
}
void
free_core(struct pstate *ps)
{
struct corefile *cf = ps->ps_core;
if (cf == NULL)
return;
if (cf->segs != NULL) {
free(cf->segs);
cf->segs = NULL;
}
if (cf->chdr != NULL) {
munmap(cf->chdr, cf->cfstat.st_size);
cf->chdr = NULL;
}
}
void
core_printregs(struct pstate *ps)
{
struct corefile *cf = ps->ps_core;
reg *rg;
char buf[256];
int i;
rg = (reg *)cf->regs;
for (i = 0; i < md_def.nregs; i++)
printf("%s:\t0x%.*lx\t%s\n", md_def.md_reg_names[i],
(int)(sizeof(reg) * 2), (long) rg[i],
sym_print(ps, rg[i], buf, sizeof(buf)));
}
ssize_t
core_read(struct pstate *ps, off_t from, void *to, size_t size)
{
struct coreseg *cs;
size_t read;
void *fp;
int i;
for (i = 0; i < ps->ps_core->chdr->c_nseg; i++) {
cs = ps->ps_core->segs[i];
if ((from >= cs->c_addr) &&
(from < (cs->c_addr + cs->c_size))) {
read = size;
if ((from + size) > (cs->c_addr + cs->c_size))
read = (cs->c_addr + cs->c_size) - from;
fp = (void *)cs + sizeof(*cs) +
((u_long)from - cs->c_addr);
memcpy(to, fp, read);
return (read);
}
}
return (-1);
}
ssize_t
core_write(struct pstate *ps, off_t to, void *from, size_t size)
{
struct coreseg *cs;
size_t written;
void *fp;
int i;
for (i = 0; i < ps->ps_core->chdr->c_nseg; i++) {
cs = ps->ps_core->segs[i];
if ((to > cs->c_addr) && (to < (cs->c_addr + cs->c_size))) {
written = size;
fp = (void *)cs + sizeof(*cs) + (to - cs->c_addr);
memcpy(fp, from, written);
return (written);
}
}
return (-1);
}
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