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Add nlist function

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This commit is contained in:
Guillem Jover 2009-05-20 04:11:57 +02:00
parent 8dbfb3529b
commit dcaec44a6f
6 changed files with 735 additions and 0 deletions
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1
Makefile
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@ -33,6 +33,7 @@ LIB_SRCS := \
strmode.c \
strlcat.c strlcpy.c \
fmtcheck.c \
nlist.c \
progname.c \
vis.c unvis.c
LIB_SRCS := $(patsubst %,src/%,$(LIB_SRCS))

3
Versions
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@ -37,5 +37,8 @@ LIBBSD_0.0 {
LIBBSD_0.1 {
strmode;
__fdnlist; /* Private symbol, but libkvm uses it. */
nlist;
} LIBBSD_0.0;

38
include/nlist.h Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (C) 2009 Guillem Jover
*
* 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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.
*/
#ifndef LIBBSD_NLIST_H
#define LIBBSD_NLIST_H
#include <sys/cdefs.h>
#include <sys/a.out.h>
__BEGIN_DECLS
extern int nlist(const char *filename, struct nlist *list);
__END_DECLS
#endif

77
man/nlist.3 Normal file
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@ -0,0 +1,77 @@
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. 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. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
.\"
.\" @(#)nlist.3 8.3 (Berkeley) 4/19/94
.\" $FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/nlist.3,v 1.7 2001/10/01 16:08:51 ru Exp $
.\"
.Dd April 19, 1994
.Dt NLIST 3
.Os
.Sh NAME
.Nm nlist
.Nd retrieve symbol table name list from an executable file
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In nlist.h
.Ft int
.Fn nlist "const char *filename" "struct nlist *nl"
.Sh DESCRIPTION
The
.Fn nlist
function
retrieves name list entries from the symbol table of an
executable file (see
.Xr a.out 5 ) .
The argument
.Fa \&nl
is set to reference the
beginning of the list.
The list is preened of binary and invalid data;
if an entry in the
name list is valid, the
.Fa n_type
and
.Fa n_value
for the entry are copied into the list
referenced by
.Fa \&nl .
No other data is copied.
The last entry in the list is always
.Dv NULL .
.Sh RETURN VALUES
The number of invalid entries is returned if successful; otherwise,
if the file
.Fa filename
does not exist or is not executable, the returned value is \-1.
.Sh SEE ALSO
.Xr a.out 5
.Sh HISTORY
A
.Fn nlist
function appeared in
.At v6 .

197
src/local-elf.h Normal file
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@ -0,0 +1,197 @@
/*
* Copyright (C) 2009 Guillem Jover
*
* 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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.
*/
#ifndef LIBBSD_LOCAL_ELF_H
#define LIBBSD_LOCAL_ELF_H
#include <elf.h>
#define IS_ELF(ehdr) \
((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
(ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
(ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
(ehdr).e_ident[EI_MAG3] == ELFMAG3)
#define ELF_TARG_VER EV_CURRENT
#if defined(__alpha__)
#define ELF_TARG_MACH EM_ALPHA
#define ELF_TARG_CLASS ELFCLASS64
#define ELF_TARG_DATA ELFDATA2LSB
#elif defined(__amd64__)
#define ELF_TARG_MACH EM_X86_64
#define ELF_TARG_CLASS ELFCLASS64
#define ELF_TARG_DATA ELFDATA2LSB
#elif defined(__arm__)
#define ELF_TARG_MACH EM_ARM
#define ELF_TARG_CLASS ELFCLASS32
#if defined(__ARMEB__)
#define ELF_TARG_DATA ELFDATA2MSB
#else
#define ELF_TARG_DATA ELFDATA2LSB
#endif
#elif defined(__avr32__)
#ifndef EM_AVR32
#define EM_AVR32 0x18ad
#endif
#define ELF_TARG_MACH EM_AVR32
#define ELF_TARG_CLASS ELFCLASS32
#if define(__LITTLE_ENDIAN__)
#define ELF_TARG_DATA ELFDATA2LSB
#elif defined(__BIG_ENDIAN__)
#define ELF_TARG_DATA ELFDATA2LMSB
#else
#error Unknown AVR32 endianness
#endif
#elif defined(__hppa__)
#define ELF_TARG_MACH EM_PARISC
#define ELF_TARG_CLASS ELFCLASS32
#define ELF_TARG_DATA ELFDATA2MSB
#elif defined(__i386__)
#define ELF_TARG_MACH EM_386
#define ELF_TARG_CLASS ELFCLASS32
#define ELF_TARG_DATA ELFDATA2LSB
#elif defined(__ia64__)
#define ELF_TARG_MACH EM_IA_64
#define ELF_TARG_CLASS ELFCLASS64
#define ELF_TARG_DATA ELFDATA2LSB
#elif defined(__m32r__)
#define ELF_TARG_MACH EM_M32R
#define ELF_TARG_CLASS ELFCLASS32
#if defined(__LITTLE_ENDIAN__)
#define ELF_DATA ELFDATA2LSB
#elif defined(__BIG_ENDIAN__)
#define ELF_DATA ELFDATA2MSB
#else
#error Unknown M32R endianness
#endif
#elif defined(__m68k__)
#define ELF_TARG_MACH EM_68K
#define ELF_TARG_CLASS ELFCLASS32
#define ELF_TARG_DATA ELFDATA2MSB
#elif defined(__mips__)
#define ELF_TARG_MACH EM_MIPS
#define ELF_TARG_CLASS ELFCLASS32
#if defined(__MIPSEB__)
#define ELF_TARG_DATA ELFDATA2MSB
#else
#define ELF_TARG_DATA ELFDATA2LSB
#endif
#elif defined(__powerpc__)
#define ELF_TARG_MACH EM_PPC
#define ELF_TARG_CLASS ELFCLASS32
#define ELF_TARG_DATA ELFDATA2MSG
#elif defined(__powerpc64__)
#define ELF_TARG_MACH EM_PPC64
#define ELF_TARG_CLASS ELFCLASS64
#define ELF_TARG_DATA ELFDATA2MSG
#elif defined(__sparc__)
#if defined(__arch64__)
#define ELF_TARG_MACH EM_SPARCV9
#define ELF_TARG_CLASS ELFCLASS64
#else
#define ELF_TARG_MACH EM_SPARC
#define ELF_TARG_CLASS ELFCLASS32
#endif
#define ELF_TARG_DATA ELFDATA2MSB
#elif defined(__sh__)
#define ELF_TARG_MACH EM_SH
#define ELF_TARG_CLASS ELFCLASS32
#if define(__LITTLE_ENDIAN__)
#define ELF_TARG_DATA ELFDATA2LSB
#elif defined(__BIG_ENDIAN__)
#define ELF_TARG_DATA ELFDATA2LMSB
#else
#error Unknown SH endianness
#endif
#elif defined(__s390__)
#define ELF_TARG_MACH EM_S390
#if defined(__s390x__)
#define ELF_TARG_CLASS ELFCLASS64
#else
#define ELF_TARG_CLASS ELFCLASS32
#endif
#define ELF_TARG_DATA ELFDATA2MSG
#else
#error Unknown ELF machine type
#endif
#if ELF_TARG_CLASS == ELFCLASS32
#define ELF_ST_BIND ELF32_ST_BIND
#define ELF_ST_TYPE ELF32_ST_TYPE
#define Elf_Word Elf32_Word
#define Elf_Sword Elf32_Sword
#define Elf_Sym Elf32_Sym
#define Elf_Off Elf32_Off
#define Elf_Shdr Elf32_Shdr
#define Elf_Ehdr Elf32_Ehdr
#elif ELF_TARG_CLASS == ELFCLASS64
#define ELF_ST_BIND ELF64_ST_BIND
#define ELF_ST_TYPE ELF64_ST_TYPE
#define Elf_Word Elf64_Word
#define Elf_Sword Elf64_Sword
#define Elf_Sym Elf64_Sym
#define Elf_Off Elf64_Off
#define Elf_Shdr Elf64_Shdr
#define Elf_Ehdr Elf64_Ehdr
#else
#error Unknown ELF class
#endif
#endif

419
src/nlist.c Normal file
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@ -0,0 +1,419 @@
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. 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. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)nlist.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <arpa/inet.h>
#include <errno.h>
#include <a.out.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#if !defined(__NO_A_OUT_SUPPORT)
#define _NLIST_DO_AOUT
#endif
#define _NLIST_DO_ELF
#ifdef _NLIST_DO_ELF
#include "local-elf.h"
#endif
#define SIZE_T_MAX 0xffffffffU
#ifdef _NLIST_DO_AOUT
static int __aout_fdnlist(int, struct nlist *);
#endif
#ifdef _NLIST_DO_ELF
static int __elf_fdnlist(int, struct nlist *);
#endif
/* FIXME: This function is used by libkvm0, so we need to export it.
It is not declared in the include files though. */
int __fdnlist(int, struct nlist *);
int
nlist(name, list)
const char *name;
struct nlist *list;
{
int fd, n;
fd = open(name, O_RDONLY, 0);
if (fd < 0)
return (-1);
n = __fdnlist(fd, list);
(void)close(fd);
return (n);
}
static struct nlist_handlers {
int (*fn)(int fd, struct nlist *list);
} nlist_fn[] = {
#ifdef _NLIST_DO_AOUT
{ __aout_fdnlist },
#endif
#ifdef _NLIST_DO_ELF
{ __elf_fdnlist },
#endif
};
int
__fdnlist(fd, list)
int fd;
struct nlist *list;
{
int n = -1, i;
for (i = 0; i < sizeof(nlist_fn) / sizeof(nlist_fn[0]); i++) {
n = (nlist_fn[i].fn)(fd, list);
if (n != -1)
break;
}
return (n);
}
#define ISLAST(p) (p->n_un.n_name == 0 || p->n_un.n_name[0] == 0)
#ifdef _NLIST_DO_AOUT
static int
__aout_fdnlist(fd, list)
int fd;
struct nlist *list;
{
struct nlist *p, *symtab;
caddr_t strtab, a_out_mmap;
off_t stroff, symoff;
u_long symsize;
int nent;
struct exec * exec;
struct stat st;
/* check that file is at least as large as struct exec! */
if ((fstat(fd, &st) < 0) || (st.st_size < sizeof(struct exec)))
return (-1);
/* Check for files too large to mmap. */
if (st.st_size > SIZE_T_MAX) {
errno = EFBIG;
return (-1);
}
/*
* Map the whole a.out file into our address space.
* We then find the string table withing this area.
* We do not just mmap the string table, as it probably
* does not start at a page boundary - we save ourselves a
* lot of nastiness by mmapping the whole file.
*
* This gives us an easy way to randomly access all the strings,
* without making the memory allocation permanent as with
* malloc/free (i.e., munmap will return it to the system).
*/
a_out_mmap = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_PRIVATE, fd, (off_t)0);
if (a_out_mmap == MAP_FAILED)
return (-1);
exec = (struct exec *)a_out_mmap;
if (N_BADMAG(*exec)) {
munmap(a_out_mmap, (size_t)st.st_size);
return (-1);
}
symoff = N_SYMOFF(*exec);
symsize = exec->a_syms;
stroff = symoff + symsize;
/* find the string table in our mmapped area */
strtab = a_out_mmap + stroff;
symtab = (struct nlist *)(a_out_mmap + symoff);
/*
* clean out any left-over information for all valid entries.
* Type and value defined to be 0 if not found; historical
* versions cleared other and desc as well. Also figure out
* the largest string length so don't read any more of the
* string table than we have to.
*
* XXX clearing anything other than n_type and n_value violates
* the semantics given in the man page.
*/
nent = 0;
for (p = list; !ISLAST(p); ++p) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
++nent;
}
while (symsize > 0) {
int soff;
symsize-= sizeof(struct nlist);
soff = symtab->n_un.n_strx;
if (soff != 0 && (symtab->n_type & N_STAB) == 0)
for (p = list; !ISLAST(p); p++)
if (!strcmp(&strtab[soff], p->n_un.n_name)) {
p->n_value = symtab->n_value;
p->n_type = symtab->n_type;
p->n_desc = symtab->n_desc;
p->n_other = symtab->n_other;
if (--nent <= 0)
break;
}
symtab++;
}
munmap(a_out_mmap, (size_t)st.st_size);
return (nent);
}
#endif
#ifdef _NLIST_DO_ELF
static void elf_sym_to_nlist(struct nlist *, Elf_Sym *, Elf_Shdr *, int);
/*
* __elf_is_okay__ - Determine if ehdr really
* is ELF and valid for the target platform.
*
* WARNING: This is NOT an ELF ABI function and
* as such its use should be restricted.
*/
static int
__elf_is_okay__(ehdr)
Elf_Ehdr *ehdr;
{
int retval = 0;
/*
* We need to check magic, class size, endianess,
* and version before we look at the rest of the
* Elf_Ehdr structure. These few elements are
* represented in a machine independant fashion.
*/
if (IS_ELF(*ehdr) &&
ehdr->e_ident[EI_CLASS] == ELF_TARG_CLASS &&
ehdr->e_ident[EI_DATA] == ELF_TARG_DATA &&
ehdr->e_ident[EI_VERSION] == ELF_TARG_VER) {
/* Now check the machine dependant header */
if (ehdr->e_machine == ELF_TARG_MACH &&
ehdr->e_version == ELF_TARG_VER)
retval = 1;
}
return retval;
}
static int
__elf_fdnlist(fd, list)
int fd;
struct nlist *list;
{
struct nlist *p;
Elf_Off symoff = 0, symstroff = 0;
Elf_Word symsize = 0, symstrsize = 0;
Elf_Sword cc, i;
int nent = -1;
int errsave;
Elf_Sym sbuf[1024];
Elf_Sym *s;
Elf_Ehdr ehdr;
char *strtab = NULL;
Elf_Shdr *shdr = NULL;
Elf_Word shdr_size;
void *base;
struct stat st;
/* Make sure obj is OK */
if (lseek(fd, (off_t)0, SEEK_SET) == -1 ||
read(fd, &ehdr, sizeof(Elf_Ehdr)) != sizeof(Elf_Ehdr) ||
!__elf_is_okay__(&ehdr) ||
fstat(fd, &st) < 0)
return (-1);
/* calculate section header table size */
shdr_size = ehdr.e_shentsize * ehdr.e_shnum;
/* Make sure it's not too big to mmap */
if (shdr_size > SIZE_T_MAX) {
errno = EFBIG;
return (-1);
}
/* mmap section header table */
base = mmap(NULL, (size_t)shdr_size, PROT_READ, 0, fd,
(off_t)ehdr.e_shoff);
if (base == MAP_FAILED)
return (-1);
shdr = (Elf_Shdr *)base;
/*
* Find the symbol table entry and it's corresponding
* string table entry. Version 1.1 of the ABI states
* that there is only one symbol table but that this
* could change in the future.
*/
for (i = 0; i < ehdr.e_shnum; i++) {
if (shdr[i].sh_type == SHT_SYMTAB) {
symoff = shdr[i].sh_offset;
symsize = shdr[i].sh_size;
symstroff = shdr[shdr[i].sh_link].sh_offset;
symstrsize = shdr[shdr[i].sh_link].sh_size;
break;
}
}
/* Check for files too large to mmap. */
if (symstrsize > SIZE_T_MAX) {
errno = EFBIG;
goto done;
}
/*
* Map string table into our address space. This gives us
* an easy way to randomly access all the strings, without
* making the memory allocation permanent as with malloc/free
* (i.e., munmap will return it to the system).
*/
base = mmap(NULL, (size_t)symstrsize, PROT_READ, 0, fd,
(off_t)symstroff);
if (base == MAP_FAILED)
goto done;
strtab = (char *)base;
/*
* clean out any left-over information for all valid entries.
* Type and value defined to be 0 if not found; historical
* versions cleared other and desc as well. Also figure out
* the largest string length so don't read any more of the
* string table than we have to.
*
* XXX clearing anything other than n_type and n_value violates
* the semantics given in the man page.
*/
nent = 0;
for (p = list; !ISLAST(p); ++p) {
p->n_type = 0;
p->n_other = 0;
p->n_desc = 0;
p->n_value = 0;
++nent;
}
/* Don't process any further if object is stripped. */
if (symoff == 0)
goto done;
if (lseek(fd, (off_t) symoff, SEEK_SET) == -1) {
nent = -1;
goto done;
}
while (symsize > 0 && nent > 0) {
cc = MIN(symsize, sizeof(sbuf));
if (read(fd, sbuf, cc) != cc)
break;
symsize -= cc;
for (s = sbuf; cc > 0 && nent > 0; ++s, cc -= sizeof(*s)) {
char *name;
struct nlist *p;
name = strtab + s->st_name;
if (name[0] == '\0')
continue;
for (p = list; !ISLAST(p); p++) {
if ((p->n_un.n_name[0] == '_' &&
strcmp(name, p->n_un.n_name+1) == 0)
|| strcmp(name, p->n_un.n_name) == 0) {
elf_sym_to_nlist(p, s, shdr,
ehdr.e_shnum);
if (--nent <= 0)
break;
}
}
}
}
done:
errsave = errno;
if (strtab != NULL)
munmap(strtab, symstrsize);
if (shdr != NULL)
munmap(shdr, shdr_size);
errno = errsave;
return (nent);
}
/*
* Convert an Elf_Sym into an nlist structure. This fills in only the
* n_value and n_type members.
*/
static void
elf_sym_to_nlist(nl, s, shdr, shnum)
struct nlist *nl;
Elf_Sym *s;
Elf_Shdr *shdr;
int shnum;
{
nl->n_value = s->st_value;
switch (s->st_shndx) {
case SHN_UNDEF:
case SHN_COMMON:
nl->n_type = N_UNDF;
break;
case SHN_ABS:
nl->n_type = ELF_ST_TYPE(s->st_info) == STT_FILE ?
N_FN : N_ABS;
break;
default:
if (s->st_shndx >= shnum)
nl->n_type = N_UNDF;
else {
Elf_Shdr *sh = shdr + s->st_shndx;
nl->n_type = sh->sh_type == SHT_PROGBITS ?
(sh->sh_flags & SHF_WRITE ? N_DATA : N_TEXT) :
(sh->sh_type == SHT_NOBITS ? N_BSS : N_UNDF);
}
break;
}
if (ELF_ST_BIND(s->st_info) == STB_GLOBAL ||
ELF_ST_BIND(s->st_info) == STB_WEAK)
nl->n_type |= N_EXT;
}
#endif /* _NLIST_DO_ELF */