[ctfdump/.git] / ctfdump.c

/*
 * Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/exec_elf.h>
#include <sys/mman.h>

#include <err.h>
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef ZLIB
#include <zlib.h>
#endif /* ZLIB */

#include "ctf.h"

#define SUNW_CTF	".SUNW_ctf"

#define DUMP_OBJECT	(1 << 0)
#define DUMP_FUNCTION	(1 << 1)
#define DUMP_HEADER	(1 << 2)
#define DUMP_LABEL	(1 << 3)

int		 dump(const char *, uint32_t);
int		 iself(const char *, size_t);
int		 isctf(const char *, size_t);
__dead void	 usage(void);

int		 ctf_dump(const char *, size_t, uint32_t);
const char	*ctf_off2name(struct ctf_header *, const char *, off_t,
		     unsigned int);

int		 elf_dump(const char *, size_t, uint32_t);
int		 elf_getshstrtab(const char *, size_t, const char **, size_t *);
int		 elf_getsymtab(const char *, const char *, size_t,
		     const Elf_Sym **, size_t *);
int		 elf_getstrtab(const char *, const char *, size_t,
		     const char **, size_t *);

#ifdef ZLIB
char		*decompress(const char *, size_t, off_t);
#endif /* ZLIB */

int
main(int argc, char *argv[])
{
	const char *filename;
	uint32_t flags = 0;
	int ch, error = 0;

	setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "dfhlsSt")) != -1) {
		switch (ch) {
		case 'd':
			flags |= DUMP_OBJECT;
			break;
		case 'f':
			flags |= DUMP_FUNCTION;
			break;
		case 'h':
			flags |= DUMP_HEADER;
			break;
		case 'l':
			flags |= DUMP_LABEL;
			break;
		default:
			usage();
		}
	}

	argc -= optind;
	argv += optind;

	while ((filename = *argv++) != NULL)
		error |= dump(filename, flags);

	return error;
}

int
dump(const char *path, uint32_t flags)
{
	struct stat		 st;
	int			 fd, error = 1;
	char			*p;

	fd = open(path, O_RDONLY);
	if (fd == -1) {
		warn("open");
		return 1;
	}
	if (fstat(fd, &st) == -1) {
		warn("fstat");
		return 1;
	}
	if (st.st_size < (off_t)sizeof(struct ctf_header)) {
		warnx("file too small to be CTF");
		return 1;
	}
	if ((uintmax_t)st.st_size > SIZE_MAX) {
		warnx("file too big to fit memory");
		return 1;
	}

	p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if (p == MAP_FAILED)
		err(1, "mmap");

	if (iself(p, st.st_size)) {
		error = elf_dump(p, st.st_size, flags);
	} else if (isctf(p, st.st_size)) {
		error = ctf_dump(p, st.st_size, flags);
	}

	munmap(p, st.st_size);
	close(fd);

	return error;
}

int
iself(const char *p, size_t filesize)
{
	Elf_Ehdr		*eh = (Elf_Ehdr *)p;

	if (eh->e_ehsize < sizeof(Elf_Ehdr) || !IS_ELF(*eh)) {
		warnx("file is not ELF");
		return 0;
	}
	if (eh->e_ident[EI_CLASS] != ELFCLASS) {
		warnx("unexpected word size %u", eh->e_ident[EI_CLASS]);
		return 0;
	}
	if (eh->e_ident[EI_VERSION] != ELF_TARG_VER) {
		warnx("unexpected version %u", eh->e_ident[EI_VERSION]);
		return 0;
	}
	if (eh->e_ident[EI_DATA] >= ELFDATANUM) {
		warnx("unexpected data format %u", eh->e_ident[EI_DATA]);
		return 0;
	}
	if (eh->e_shoff > filesize) {
		warnx("bogus section table offset 0x%llx", eh->e_shoff);
		return 0;
	}
	if (eh->e_shentsize < sizeof(Elf_Shdr)) {
		warnx("bogus section header size %u", eh->e_shentsize);
		return 0;
	}
	if (eh->e_shnum > (filesize - eh->e_shoff) / eh->e_shentsize) {
		warnx("bogus section header count %u", eh->e_shnum);
		return 0;
	}
	if (eh->e_shstrndx >= eh->e_shnum) {
		warnx("bogus string table index %u", eh->e_shstrndx);
		return 0;
	}

	return 1;
}

int
elf_getshstrtab(const char *p, size_t filesize, const char **shstrtab,
    size_t *shstrtabsize)
{
	Elf_Ehdr		*eh = (Elf_Ehdr *)p;
	Elf_Shdr		*sh;

	sh = (Elf_Shdr *)(p + eh->e_shoff + eh->e_shstrndx * eh->e_shentsize);
	if (sh->sh_type != SHT_STRTAB) {
		warnx("unexpected string table type");
		return 1;
	}
	if (sh->sh_offset > filesize) {
		warnx("bogus string table offset");
		return 1;
	}
	if (sh->sh_size > filesize - sh->sh_offset) {
		warnx("bogus string table size");
		return 1;
	}
	if (shstrtab != NULL)
		*shstrtab = p + sh->sh_offset;
	if (shstrtabsize != NULL)
		*shstrtabsize = sh->sh_size;

	return 0;
}

int
elf_getsymtab(const char *p, const char *shstrtab, size_t shstrtabsize,
    const Elf_Sym **symtab, size_t *nsymb)
{
	Elf_Ehdr	*eh = (Elf_Ehdr *)p;
	Elf_Shdr	*sh;
	size_t		 i;

	for (i = 0; i < eh->e_shnum; i++) {
		sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);

		if (sh->sh_type != SHT_SYMTAB)
			continue;

		if ((sh->sh_link >= eh->e_shnum) ||
		    (sh->sh_name >= shstrtabsize))
			continue;

		if (strncmp(shstrtab + sh->sh_name, ELF_SYMTAB,
		    strlen(ELF_SYMTAB)) == 0) {
			if (symtab != NULL)
				*symtab = (Elf_Sym *)(p + sh->sh_offset);
			if (nsymb != NULL)
				*nsymb = (sh->sh_size / sh->sh_entsize);

			return 0;
		}
	}

	return 1;
}

int
elf_getstrtab(const char *p, const char *shstrtab, size_t shstrtabsize,
    const char **strtab, size_t *strtabsize)
{
	Elf_Ehdr	*eh = (Elf_Ehdr *)p;
	Elf_Shdr	*sh;
	size_t		 i;

	for (i = 0; i < eh->e_shnum; i++) {
		sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);

		if (sh->sh_type != SHT_STRTAB)
			continue;

		if ((sh->sh_link >= eh->e_shnum) ||
		    (sh->sh_name >= shstrtabsize))
			continue;

		if (strncmp(shstrtab + sh->sh_name, ELF_STRTAB,
		    strlen(ELF_STRTAB)) == 0) {
			if (strtab != NULL)
				*strtab = p + sh->sh_offset;
			if (strtabsize != NULL)
				*strtabsize = sh->sh_size;

			return 0;
		}
	}

	return 1;
}

const char		*strtab;
const Elf_Sym		*symtab;
size_t			 strtabsize, nsymb;

const char *
elf_idx2sym(size_t *idx, unsigned char type)
{
	const Elf_Sym	*st;
	size_t		 i;

	for (i = *idx + 1; i < nsymb; i++) {
		st = &symtab[i];

		if (ELF_ST_TYPE(st->st_info) != type)
			continue;

		*idx = i;
		return strtab + st->st_name;
	}

	return NULL;
}

int
elf_dump(const char *p, size_t filesize, uint32_t flags)
{
	Elf_Ehdr		*eh = (Elf_Ehdr *)p;
	Elf_Shdr		*sh;
	const char		*shstrtab;
	size_t			 i, shstrtabsize;

	/* Find section header string table location and size. */
	if (elf_getshstrtab(p, filesize, &shstrtab, &shstrtabsize))
		return 1;

	/* Find symbol table location and number of symbols. */
	if (elf_getsymtab(p, shstrtab, shstrtabsize, &symtab, &nsymb))
		warnx("symbol table not found");

	/* Find string table location and size. */
	if (elf_getstrtab(p, shstrtab, shstrtabsize, &strtab, &strtabsize))
		warnx("string table not found");

	/* Find CTF section and dump it. */
	for (i = 0; i < eh->e_shnum; i++) {
		sh = (Elf_Shdr *)(p + eh->e_shoff + i * eh->e_shentsize);

		if ((sh->sh_link >= eh->e_shnum) ||
		    (sh->sh_name >= shstrtabsize))
			continue;

		if (strncmp(shstrtab + sh->sh_name, SUNW_CTF, strlen(SUNW_CTF)))
			continue;

		if (!isctf(p + sh->sh_offset, sh->sh_size))
			break;

		return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
	}

	warnx("%s section not found", SUNW_CTF);
	return 1;
}

int
isctf(const char *p, size_t filesize)
{
	struct ctf_header	*cth = (struct ctf_header *)p;
	off_t 			 dlen = cth->cth_stroff + cth->cth_strlen;

	if (cth->cth_magic != CTF_MAGIC || cth->cth_version != CTF_VERSION)
		return 0;

	if (dlen > filesize && !(cth->cth_flags & CTF_F_COMPRESS)) {
		warnx("bogus file size");
		return 0;
	}

	if ((cth->cth_lbloff & 3) || (cth->cth_objtoff & 1) ||
	    (cth->cth_funcoff & 1) || (cth->cth_typeoff & 3)) {
		warnx("wrongly aligned offset");
		return 0;
	}

	if ((cth->cth_lbloff >= dlen) || (cth->cth_objtoff >= dlen) ||
	    (cth->cth_funcoff >= dlen) || (cth->cth_typeoff >= dlen)) {
		warnx("truncated file");
		return 0;
	}

	if ((cth->cth_lbloff > cth->cth_objtoff) ||
	    (cth->cth_objtoff > cth->cth_funcoff) ||
	    (cth->cth_funcoff > cth->cth_typeoff) ||
	    (cth->cth_typeoff > cth->cth_stroff)) {
		warnx("corrupted file");
		return 0;
	}

	return 1;
}

int
ctf_dump(const char *p, size_t size, uint32_t flags)
{
	struct ctf_header	*cth = (struct ctf_header *)p;
	char			*data = (char *)p;
	off_t 			 dlen = cth->cth_stroff + cth->cth_strlen;

	if (cth->cth_flags & CTF_F_COMPRESS) {
		data = decompress(p + sizeof(*cth), size - sizeof(*cth), dlen);
		if (data == NULL)
			return 1;
	}

	if (flags & DUMP_HEADER) {
		printf("cth_magic    = 0x%04x\n", cth->cth_magic);
		printf("cth_version  = %d\n", cth->cth_version);
		printf("cth_flags    = 0x%02x\n", cth->cth_flags);
		printf("cth_parlabel = %s\n",
		    ctf_off2name(cth, data, dlen, cth->cth_parname));
		printf("cth_parname  = %s\n",
		    ctf_off2name(cth, data, dlen, cth->cth_parname));
		printf("cth_lbloff   = %d\n", cth->cth_lbloff);
		printf("cth_objtoff  = %d\n", cth->cth_objtoff);
		printf("cth_funcoff  = %d\n", cth->cth_funcoff);
		printf("cth_typeoff  = %d\n", cth->cth_typeoff);
		printf("cth_stroff   = %d\n", cth->cth_stroff);
		printf("cth_strlen   = %d\n", cth->cth_strlen);
	}

	if (flags & DUMP_LABEL) {
		unsigned int		 lbloff = cth->cth_lbloff;
		struct ctf_lblent	*ctl;

		while (lbloff < cth->cth_objtoff) {
			ctl = (struct ctf_lblent *)(data + lbloff);

			printf("%5u %s\n", ctl->ctl_typeidx,
			    ctf_off2name(cth, data, dlen, ctl->ctl_label));

			lbloff += sizeof(*ctl);
		}
	}

	if (flags & DUMP_OBJECT) {
		unsigned int		 objtoff = cth->cth_objtoff;
		size_t			 idx = 0, i = 0;
		unsigned short		*dsp;
		const char		*s;
		int			 l;

		while (objtoff < cth->cth_funcoff) {
			dsp = (unsigned short *)(data + objtoff);

			l = printf("[%zu] %u", i++, *dsp);
			if ((s = elf_idx2sym(&idx, STT_OBJECT)) != NULL)
				printf("%*s %s (%zu)\n", (12 - l), "", s, idx);
			else
				printf("\n");

			objtoff += sizeof(*dsp);
		}
	}

	if (flags & DUMP_FUNCTION) {
		unsigned short		*fsp, kind, vlen;
		size_t			 idx = 0, i = 0;
		const char		*s;
		int			 l;

		fsp = (unsigned short *)(data + cth->cth_funcoff);
		while (fsp < (unsigned short *)(data + cth->cth_typeoff)) {
			kind = CTF_INFO_KIND(*fsp);
			vlen = CTF_INFO_VLEN(*fsp);
			fsp++;

			if (kind == CTF_K_UNKNOWN && vlen == 0)
				continue;

			l = printf("%u [%zu] FUNC", vlen, i++);
			if ((s = elf_idx2sym(&idx, STT_FUNC)) != NULL)
				printf(" (%s)", s);
			printf(" returns: %u args: (", *fsp++);
			while (vlen-- > 0)
				printf("%u%s", *fsp++, (vlen > 0) ? ", " : "");
			printf(")\n");
		}
	}

	if (cth->cth_flags & CTF_F_COMPRESS)
		free(data);

	return 0;
}

const char *
ctf_off2name(struct ctf_header *cth, const char *data, off_t dlen,
    unsigned int offset)
{
	const char		*name;

	if (CTF_NAME_STID(offset) != CTF_STRTAB_0)
		return "external";

	if (CTF_NAME_OFFSET(offset) >= cth->cth_strlen)
		return "exceeds strlab";

	if (cth->cth_stroff + CTF_NAME_OFFSET(offset) >= dlen)
		return "invalid";

	name = data + cth->cth_stroff + CTF_NAME_OFFSET(offset);
	if (*name == '\0')
		return "(anon)";

	return name;
}

char *
decompress(const char *buf, size_t size, off_t len)
{
#ifdef ZLIB
	z_stream		 stream;
	char			*data;
	int			 error;

	data = malloc(len);
	if (data == NULL) {
		warn(NULL);
		return NULL;
	}

	memset(&stream, 0, sizeof(stream));
	stream.next_in = (void *)buf;
	stream.avail_in = size;
	stream.next_out = data;
	stream.avail_out = len;

	if ((error = inflateInit(&stream)) != Z_OK) {
		warnx("zlib inflateInit failed: %s", zError(error));
		goto exit;
	}

	if ((error = inflate(&stream, Z_FINISH)) != Z_STREAM_END) {
		warnx("zlib inflate failed: %s", zError(error));
		goto exit;
	}

	if ((error = inflateEnd(&stream)) != Z_OK) {
		warnx("zlib inflateEnd failed: %s", zError(error));
		goto exit;
	}

	if (stream.total_out != len) {
		warnx("decompression failed: %llu != %llu",
		    stream.total_out, len);
		goto exit;
	}

	return data;

exit:
	free(data);
#endif /* ZLIB */
	return NULL;
}

__dead void
usage(void)
{
	extern char		*__progname;

	fprintf(stderr, "usage: %s [-dfhlsSt] [file ...]\n",
	    __progname);
	exit(1);
}
Commit	Line	Data
f8621c6a MP	1	/*
	2	* Copyright (c) 2016 Martin Pieuchot <mpi@openbsd.org>
	3	*
	4	* Permission to use, copy, modify, and distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
	17	#include <sys/param.h>
	18	#include <sys/types.h>
	19	#include <sys/stat.h>
	20	#include <sys/exec_elf.h>
	21	#include <sys/mman.h>
	22
	23	#include <err.h>
	24	#include <fcntl.h>
	25	#include <locale.h>
	26	#include <stdio.h>
	27	#include <stdint.h>
	28	#include <stdlib.h>
	29	#include <string.h>
	30	#include <unistd.h>
	31
	32	#ifdef ZLIB
	33	#include <zlib.h>
	34	#endif /* ZLIB */
	35
	36	#include "ctf.h"
	37
	38	#define SUNW_CTF ".SUNW_ctf"
	39
	40	#define DUMP_OBJECT (1 << 0)
	41	#define DUMP_FUNCTION (1 << 1)
	42	#define DUMP_HEADER (1 << 2)
751fc09a	43	#define DUMP_LABEL (1 << 3)
f8621c6a MP	44
	45	int dump(const char *, uint32_t);
	46	int iself(const char *, size_t);
	47	int isctf(const char *, size_t);
	48	__dead void usage(void);
	49
	50	int ctf_dump(const char *, size_t, uint32_t);
	51	const char ctf_off2name(struct ctf_header , const char *, off_t,
	52	unsigned int);
	53
	54	int elf_dump(const char *, size_t, uint32_t);
	55	int elf_getshstrtab(const char , size_t, const char , size_t );
	56	int elf_getsymtab(const char , const char , size_t,
	57	const Elf_Sym *, size_t );
	58	int elf_getstrtab(const char , const char , size_t,
	59	const char *, size_t );
	60
	61	#ifdef ZLIB
	62	char decompress(const char , size_t, off_t);
	63	#endif /* ZLIB */
	64
	65	int
	66	main(int argc, char *argv[])
	67	{
	68	const char *filename;
	69	uint32_t flags = 0;
	70	int ch, error = 0;
	71
	72	setlocale(LC_ALL, "");
	73
	74	while ((ch = getopt(argc, argv, "dfhlsSt")) != -1) {
	75	switch (ch) {
9fe3b2c8 MP	76	case 'd':
	77	flags \|= DUMP_OBJECT;
	78	break;
acada86d MP	79	case 'f':
	80	flags \|= DUMP_FUNCTION;
	81	break;
f8621c6a MP	82	case 'h':
	83	flags \|= DUMP_HEADER;
	84	break;
751fc09a MP	85	case 'l':
	86	flags \|= DUMP_LABEL;
	87	break;
f8621c6a MP	88	default:
	89	usage();
	90	}
	91	}
	92
	93	argc -= optind;
	94	argv += optind;
	95
	96	while ((filename = *argv++) != NULL)
	97	error \|= dump(filename, flags);
	98
	99	return error;
	100	}
	101
	102	int
	103	dump(const char *path, uint32_t flags)
	104	{
	105	struct stat st;
	106	int fd, error = 1;
	107	char *p;
	108
	109	fd = open(path, O_RDONLY);
	110	if (fd == -1) {
	111	warn("open");
	112	return 1;
	113	}
	114	if (fstat(fd, &st) == -1) {
	115	warn("fstat");
	116	return 1;
	117	}
	118	if (st.st_size < (off_t)sizeof(struct ctf_header)) {
	119	warnx("file too small to be CTF");
	120	return 1;
	121	}
	122	if ((uintmax_t)st.st_size > SIZE_MAX) {
	123	warnx("file too big to fit memory");
	124	return 1;
	125	}
	126
	127	p = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	128	if (p == MAP_FAILED)
	129	err(1, "mmap");
	130
	131	if (iself(p, st.st_size)) {
	132	error = elf_dump(p, st.st_size, flags);
	133	} else if (isctf(p, st.st_size)) {
	134	error = ctf_dump(p, st.st_size, flags);
	135	}
	136
	137	munmap(p, st.st_size);
	138	close(fd);
	139
	140	return error;
	141	}
	142
	143	int
	144	iself(const char *p, size_t filesize)
	145	{
	146	Elf_Ehdr eh = (Elf_Ehdr )p;
	147
	148	if (eh->e_ehsize < sizeof(Elf_Ehdr) \|\| !IS_ELF(*eh)) {
	149	warnx("file is not ELF");
	150	return 0;
	151	}
152	if (eh->e_ident[EI_CLASS] != ELFCLASS) {
153	warnx("unexpected word size %u", eh->e_ident[EI_CLASS]);
154	return 0;
155	}
156	if (eh->e_ident[EI_VERSION] != ELF_TARG_VER) {
157	warnx("unexpected version %u", eh->e_ident[EI_VERSION]);
158	return 0;
159	}
160	if (eh->e_ident[EI_DATA] >= ELFDATANUM) {
161	warnx("unexpected data format %u", eh->e_ident[EI_DATA]);
162	return 0;
163	}
164	if (eh->e_shoff > filesize) {
165	warnx("bogus section table offset 0x%llx", eh->e_shoff);
166	return 0;
167	}
168	if (eh->e_shentsize < sizeof(Elf_Shdr)) {
169	warnx("bogus section header size %u", eh->e_shentsize);
170	return 0;
171	}
172	if (eh->e_shnum > (filesize - eh->e_shoff) / eh->e_shentsize) {
173	warnx("bogus section header count %u", eh->e_shnum);
174	return 0;
175	}
176	if (eh->e_shstrndx >= eh->e_shnum) {
177	warnx("bogus string table index %u", eh->e_shstrndx);
178	return 0;
179	}
180
181	return 1;
182	}
183
184	int
185	elf_getshstrtab(const char p, size_t filesize, const char *shstrtab,
186	size_t *shstrtabsize)
187	{
188	Elf_Ehdr eh = (Elf_Ehdr )p;
189	Elf_Shdr *sh;
190
191	sh = (Elf_Shdr )(p + eh->e_shoff + eh->e_shstrndx eh->e_shentsize);
192	if (sh->sh_type != SHT_STRTAB) {
193	warnx("unexpected string table type");
194	return 1;
195	}
196	if (sh->sh_offset > filesize) {
197	warnx("bogus string table offset");
198	return 1;
199	}
200	if (sh->sh_size > filesize - sh->sh_offset) {
201	warnx("bogus string table size");
202	return 1;
203	}
204	if (shstrtab != NULL)
205	*shstrtab = p + sh->sh_offset;
206	if (shstrtabsize != NULL)
207	*shstrtabsize = sh->sh_size;
208
209	return 0;
210	}
211
212	int
213	elf_getsymtab(const char p, const char shstrtab, size_t shstrtabsize,
214	const Elf_Sym *symtab, size_t nsymb)
215	{
216	Elf_Ehdr eh = (Elf_Ehdr )p;
217	Elf_Shdr *sh;
218	size_t i;
219
220	for (i = 0; i < eh->e_shnum; i++) {
221	sh = (Elf_Shdr )(p + eh->e_shoff + i eh->e_shentsize);
222
223	if (sh->sh_type != SHT_SYMTAB)
224	continue;
225
226	if ((sh->sh_link >= eh->e_shnum) \|\|
227	(sh->sh_name >= shstrtabsize))
228	continue;
229
230	if (strncmp(shstrtab + sh->sh_name, ELF_SYMTAB,
231	strlen(ELF_SYMTAB)) == 0) {
232	if (symtab != NULL)
233	symtab = (Elf_Sym )(p + sh->sh_offset);
234	if (nsymb != NULL)
235	*nsymb = (sh->sh_size / sh->sh_entsize);
236
237	return 0;
238	}
239	}
240
241	return 1;
242	}
243
244	int
245	elf_getstrtab(const char p, const char shstrtab, size_t shstrtabsize,
246	const char *strtab, size_t strtabsize)
247	{
248	Elf_Ehdr eh = (Elf_Ehdr )p;
249	Elf_Shdr *sh;
250	size_t i;
251
252	for (i = 0; i < eh->e_shnum; i++) {
253	sh = (Elf_Shdr )(p + eh->e_shoff + i eh->e_shentsize);
254
255	if (sh->sh_type != SHT_STRTAB)
256	continue;
257
258	if ((sh->sh_link >= eh->e_shnum) \|\|
259	(sh->sh_name >= shstrtabsize))
260	continue;
261
262	if (strncmp(shstrtab + sh->sh_name, ELF_STRTAB,
263	strlen(ELF_STRTAB)) == 0) {
264	if (strtab != NULL)
265	*strtab = p + sh->sh_offset;
266	if (strtabsize != NULL)
267	*strtabsize = sh->sh_size;
268
269	return 0;
270	}
271	}
272
273	return 1;
274	}
275
276	const char *strtab;
277	const Elf_Sym *symtab;
278	size_t strtabsize, nsymb;
279
9fe3b2c8 MP	280	const char *
	281	elf_idx2sym(size_t *idx, unsigned char type)
	282	{
	283	const Elf_Sym *st;
	284	size_t i;
	285
	286	for (i = *idx + 1; i < nsymb; i++) {
	287	st = &symtab[i];
	288
	289	if (ELF_ST_TYPE(st->st_info) != type)
	290	continue;
	291
	292	*idx = i;
	293	return strtab + st->st_name;
	294	}
	295
	296	return NULL;
	297	}
	298
f8621c6a MP	299	int
	300	elf_dump(const char *p, size_t filesize, uint32_t flags)
	301	{
	302	Elf_Ehdr eh = (Elf_Ehdr )p;
	303	Elf_Shdr *sh;
	304	const char *shstrtab;
	305	size_t i, shstrtabsize;
	306
	307	/* Find section header string table location and size. */
	308	if (elf_getshstrtab(p, filesize, &shstrtab, &shstrtabsize))
	309	return 1;
	310
	311	/* Find symbol table location and number of symbols. */
	312	if (elf_getsymtab(p, shstrtab, shstrtabsize, &symtab, &nsymb))
	313	warnx("symbol table not found");
	314
	315	/* Find string table location and size. */
	316	if (elf_getstrtab(p, shstrtab, shstrtabsize, &strtab, &strtabsize))
	317	warnx("string table not found");
	318
	319	/* Find CTF section and dump it. */
	320	for (i = 0; i < eh->e_shnum; i++) {
	321	sh = (Elf_Shdr )(p + eh->e_shoff + i eh->e_shentsize);
	322
	323	if ((sh->sh_link >= eh->e_shnum) \|\|
	324	(sh->sh_name >= shstrtabsize))
	325	continue;
	326
	327	if (strncmp(shstrtab + sh->sh_name, SUNW_CTF, strlen(SUNW_CTF)))
	328	continue;
	329
	330	if (!isctf(p + sh->sh_offset, sh->sh_size))
	331	break;
	332
	333	return ctf_dump(p + sh->sh_offset, sh->sh_size, flags);
	334	}
	335
	336	warnx("%s section not found", SUNW_CTF);
	337	return 1;
	338	}
	339
	340	int
	341	isctf(const char *p, size_t filesize)
	342	{
	343	struct ctf_header cth = (struct ctf_header )p;
	344	off_t dlen = cth->cth_stroff + cth->cth_strlen;
	345
	346	if (cth->cth_magic != CTF_MAGIC \|\| cth->cth_version != CTF_VERSION)
	347	return 0;
	348
	349	if (dlen > filesize && !(cth->cth_flags & CTF_F_COMPRESS)) {
	350	warnx("bogus file size");
	351	return 0;
	352	}
	353
	354	if ((cth->cth_lbloff & 3) \|\| (cth->cth_objtoff & 1) \|\|
	355	(cth->cth_funcoff & 1) \|\| (cth->cth_typeoff & 3)) {
	356	warnx("wrongly aligned offset");
	357	return 0;
	358	}
	359
	360	if ((cth->cth_lbloff >= dlen) \|\| (cth->cth_objtoff >= dlen) \|\|
	361	(cth->cth_funcoff >= dlen) \|\| (cth->cth_typeoff >= dlen)) {
	362	warnx("truncated file");
363	return 0;
364	}
365
366	if ((cth->cth_lbloff > cth->cth_objtoff) \|\|
367	(cth->cth_objtoff > cth->cth_funcoff) \|\|
368	(cth->cth_funcoff > cth->cth_typeoff) \|\|
369	(cth->cth_typeoff > cth->cth_stroff)) {
370	warnx("corrupted file");
371	return 0;
372	}
373
374	return 1;
375	}
376
377	int
378	ctf_dump(const char *p, size_t size, uint32_t flags)
379	{
380	struct ctf_header cth = (struct ctf_header )p;
381	char data = (char )p;
382	off_t dlen = cth->cth_stroff + cth->cth_strlen;
383
384	if (cth->cth_flags & CTF_F_COMPRESS) {
385	data = decompress(p + sizeof(cth), size - sizeof(cth), dlen);
386	if (data == NULL)
387	return 1;
388	}
389
390	if (flags & DUMP_HEADER) {
391	printf("cth_magic = 0x%04x\n", cth->cth_magic);
392	printf("cth_version = %d\n", cth->cth_version);
393	printf("cth_flags = 0x%02x\n", cth->cth_flags);
394	printf("cth_parlabel = %s\n",
395	ctf_off2name(cth, data, dlen, cth->cth_parname));
396	printf("cth_parname = %s\n",
397	ctf_off2name(cth, data, dlen, cth->cth_parname));
398	printf("cth_lbloff = %d\n", cth->cth_lbloff);
399	printf("cth_objtoff = %d\n", cth->cth_objtoff);
400	printf("cth_funcoff = %d\n", cth->cth_funcoff);
401	printf("cth_typeoff = %d\n", cth->cth_typeoff);
402	printf("cth_stroff = %d\n", cth->cth_stroff);
403	printf("cth_strlen = %d\n", cth->cth_strlen);
404	}
405
751fc09a MP	406	if (flags & DUMP_LABEL) {
	407	unsigned int lbloff = cth->cth_lbloff;
	408	struct ctf_lblent *ctl;
	409
	410	while (lbloff < cth->cth_objtoff) {
	411	ctl = (struct ctf_lblent *)(data + lbloff);
	412
	413	printf("%5u %s\n", ctl->ctl_typeidx,
	414	ctf_off2name(cth, data, dlen, ctl->ctl_label));
	415
	416	lbloff += sizeof(*ctl);
	417	}
	418	}
	419
9fe3b2c8 MP	420	if (flags & DUMP_OBJECT) {
	421	unsigned int objtoff = cth->cth_objtoff;
	422	size_t idx = 0, i = 0;
	423	unsigned short *dsp;
	424	const char *s;
	425	int l;
	426
	427	while (objtoff < cth->cth_funcoff) {
	428	dsp = (unsigned short *)(data + objtoff);
	429
	430	l = printf("[%zu] %u", i++, *dsp);
	431	if ((s = elf_idx2sym(&idx, STT_OBJECT)) != NULL)
	432	printf("%*s %s (%zu)\n", (12 - l), "", s, idx);
	433	else
	434	printf("\n");
	435
	436	objtoff += sizeof(*dsp);
	437	}
	438	}
	439
acada86d MP	440	if (flags & DUMP_FUNCTION) {
	441	unsigned short *fsp, kind, vlen;
	442	size_t idx = 0, i = 0;
	443	const char *s;
	444	int l;
	445
	446	fsp = (unsigned short *)(data + cth->cth_funcoff);
	447	while (fsp < (unsigned short *)(data + cth->cth_typeoff)) {
	448	kind = CTF_INFO_KIND(*fsp);
	449	vlen = CTF_INFO_VLEN(*fsp);
	450	fsp++;
	451
	452	if (kind == CTF_K_UNKNOWN && vlen == 0)
	453	continue;
	454
	455	l = printf("%u [%zu] FUNC", vlen, i++);
	456	if ((s = elf_idx2sym(&idx, STT_FUNC)) != NULL)
	457	printf(" (%s)", s);
	458	printf(" returns: %u args: (", *fsp++);
	459	while (vlen-- > 0)
	460	printf("%u%s", *fsp++, (vlen > 0) ? ", " : "");
	461	printf(")\n");
	462	}
	463	}
	464
f8621c6a MP	465	if (cth->cth_flags & CTF_F_COMPRESS)
	466	free(data);
	467
	468	return 0;
	469	}
	470
	471	const char *
	472	ctf_off2name(struct ctf_header cth, const char data, off_t dlen,
	473	unsigned int offset)
	474	{
	475	const char *name;
	476
	477	if (CTF_NAME_STID(offset) != CTF_STRTAB_0)
	478	return "external";
	479
	480	if (CTF_NAME_OFFSET(offset) >= cth->cth_strlen)
	481	return "exceeds strlab";
	482
	483	if (cth->cth_stroff + CTF_NAME_OFFSET(offset) >= dlen)
	484	return "invalid";
	485
	486	name = data + cth->cth_stroff + CTF_NAME_OFFSET(offset);
	487	if (*name == '\0')
	488	return "(anon)";
	489
	490	return name;
	491	}
	492
	493	char *
	494	decompress(const char *buf, size_t size, off_t len)
	495	{
	496	#ifdef ZLIB
	497	z_stream stream;
	498	char *data;
	499	int error;
	500
	501	data = malloc(len);
	502	if (data == NULL) {
	503	warn(NULL);
	504	return NULL;
	505	}
	506
	507	memset(&stream, 0, sizeof(stream));
	508	stream.next_in = (void *)buf;
	509	stream.avail_in = size;
	510	stream.next_out = data;
	511	stream.avail_out = len;
	512
	513	if ((error = inflateInit(&stream)) != Z_OK) {
	514	warnx("zlib inflateInit failed: %s", zError(error));
	515	goto exit;
	516	}
	517
	518	if ((error = inflate(&stream, Z_FINISH)) != Z_STREAM_END) {
	519	warnx("zlib inflate failed: %s", zError(error));
	520	goto exit;
	521	}
	522
	523	if ((error = inflateEnd(&stream)) != Z_OK) {
	524	warnx("zlib inflateEnd failed: %s", zError(error));
	525	goto exit;
	526	}
	527
	528	if (stream.total_out != len) {
529	warnx("decompression failed: %llu != %llu",
530	stream.total_out, len);
531	goto exit;
532	}
533
534	return data;
535
536	exit:
537	free(data);
538	#endif /* ZLIB */
539	return NULL;
540	}
541
542	__dead void
543	usage(void)
544	{
545	extern char *__progname;
546
547	fprintf(stderr, "usage: %s [-dfhlsSt] [file ...]\n",
548	__progname);
549	exit(1);
550	}
551