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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Joyent, Inc. All rights reserved.
* Copyright (c) 2011, Robert Mustacchi, Inc. All rights reserved.
* Copyright 2013, Richard Lowe.
*/
#include <err.h>
#include <fcntl.h>
#include <gelf.h>
#include <libctf.h>
#include <saveargs.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
extern const char *__progname;
typedef struct symtab_sym {
GElf_Sym ss_sym;
char *ss_name;
ctf_funcinfo_t ss_finfo;
uint8_t *ss_data;
size_t ss_size;
} symtab_sym_t;
static void
walk_symtab(Elf *elf, char *fname, ctf_file_t *fp,
void (*callback)(ctf_file_t *, symtab_sym_t *))
{
Elf_Scn *stab = NULL;
Elf_Scn *text = NULL;
Elf_Data *stabdata = NULL;
Elf_Data *textdata = NULL;
GElf_Ehdr ehdr;
GElf_Shdr stabshdr;
GElf_Shdr textshdr;
int foundtext = 0, foundstab = 0;
symtab_sym_t ss;
if ((gelf_getehdr(elf, &ehdr)) == NULL)
errx(1, "could not read ELF header from %s\n",
fname);
while ((stab = elf_nextscn(elf, stab)) != NULL) {
(void) gelf_getshdr(stab, &stabshdr);
if (stabshdr.sh_type == SHT_SYMTAB) {
foundstab = 1;
break;
}
}
while ((text = elf_nextscn(elf, text)) != NULL) {
(void) gelf_getshdr(text, &textshdr);
if (strcmp(".text", elf_strptr(elf,
ehdr.e_shstrndx, (size_t)textshdr.sh_name)) == 0) {
foundtext = 1;
break;
}
}
if (!foundstab || !foundtext)
return;
stabdata = elf_getdata(stab, NULL);
textdata = elf_rawdata(text, NULL);
for (unsigned symdx = 0;
symdx < (stabshdr.sh_size / stabshdr.sh_entsize);
symdx++) {
(void) gelf_getsym(stabdata, symdx, &ss.ss_sym);
if ((GELF_ST_TYPE(ss.ss_sym.st_info) != STT_FUNC) ||
(ss.ss_sym.st_shndx == SHN_UNDEF))
continue;
ss.ss_name = elf_strptr(elf, stabshdr.sh_link,
ss.ss_sym.st_name);
ss.ss_data = ((uint8_t *)(textdata->d_buf)) +
(ss.ss_sym.st_value - textshdr.sh_addr);
if (ctf_func_info(fp, symdx, &ss.ss_finfo) == CTF_ERR) {
fprintf(stderr, "failed to get funcinfo for: %s\n",
ss.ss_name);
continue;
}
(void) callback(fp, &ss);
}
}
void
check_sym(ctf_file_t *ctfp, symtab_sym_t *ss)
{
int rettype = ctf_type_kind(ctfp, ss->ss_finfo.ctc_return);
int start_index = 0;
if (ss->ss_finfo.ctc_argc == 0) /* No arguments, no point */
return;
if (((rettype == CTF_K_STRUCT) || (rettype == CTF_K_UNION)) &&
ctf_type_size(ctfp, ss->ss_finfo.ctc_return) > 16)
start_index = 1;
if (saveargs_has_args(ss->ss_data, ss->ss_sym.st_size,
ss->ss_finfo.ctc_argc, start_index) != SAVEARGS_NO_ARGS)
printf("%s has %d saved args\n", ss->ss_name,
ss->ss_finfo.ctc_argc);
}
int
main(int argc, char **argv)
{
Elf *elf;
ctf_file_t *ctfp;
int errp, fd;
if (ctf_version(CTF_VERSION) == -1)
errx(1, "mismatched libctf versions\n");
if (elf_version(EV_CURRENT) == EV_NONE)
errx(1, "mismatched libelf versions\n");
if (argc != 2)
errx(2, "usage: %s <file>\n", __progname);
if ((ctfp = ctf_open(argv[1], &errp)) == NULL)
errx(1, "failed to ctf_open file: %s: %s\n", argv[1],
ctf_errmsg(errp));
if ((fd = open(argv[1], O_RDONLY)) == -1)
errx(1, "could not open %s\n", argv[1]);
if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL)
errx(1, "could not interpret ELF from %s\n",
argv[1]);
walk_symtab(elf, argv[1], ctfp, check_sym);
(void) elf_end(elf);
(void) close(fd);
return (0);
}
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