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@@ -1,61 +1,313 @@
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-/* adapted from Eric Youngdale's readelf program */
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+/* vi: set sw=4 ts=4: */
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+/*
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+ * A small little readelf implementation for uClibc
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+ *
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+ * Copyright (C) 2001 by Lineo, inc.
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+ * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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+ *
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+ * Several functions in this file (specifically, elf_find_section_type(),
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+ * elf_find_phdr_type(), and elf_find_dynamic(), were stolen from elflib.c from
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+ * elfvector (http://www.BitWagon.com/elfvector.html) by John F. Reiser
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+ * <jreiser@BitWagon.com>, and which is copyright 2000 BitWagon Software LLC
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+ * (GPL2).
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ *
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+ */
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+
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+#include <elf.h>
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+#include <fcntl.h>
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#include <stdio.h>
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+#include <stdlib.h>
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#include <string.h>
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-#include <sys/stat.h>
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-#include <sys/mman.h>
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-#include <link.h>
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-#include <elf.h>
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#include <unistd.h>
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-#include "../config.h"
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-#include "readelf.h"
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+#include <sys/mman.h>
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+#include <sys/stat.h>
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#include <sys/types.h>
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-void warn(char *fmt, ...);
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-char *xstrdup(char *);
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-
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-struct needed_tab
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-{
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- char *soname;
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- int type;
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-};
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-
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-struct needed_tab needed_tab[] = {
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- { "libc.so.5", LIB_ELF_LIBC5 },
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- { "libm.so.5", LIB_ELF_LIBC5 },
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- { "libdl.so.1", LIB_ELF_LIBC5 },
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- { "libc.so.6", LIB_ELF_LIBC6 },
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- { "libm.so.6", LIB_ELF_LIBC6 },
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- { "libdl.so.2", LIB_ELF_LIBC6 },
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- { NULL, LIB_ELF }
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-};
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-
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-char *readsoname(char *name, FILE *infile, int expected_type,
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- int *type, int elfclass)
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-{
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- char *res;
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-
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- if (elfclass == ELFCLASS32)
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- res = readsoname32(name, infile, expected_type, type);
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- else
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- {
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- res = readsoname64(name, infile, expected_type, type);
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-#if 0
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- *type |= LIB_ELF64;
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-#endif
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- }
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-
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- return res;
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-}
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-
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-#undef __ELF_NATIVE_CLASS
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-#undef readsonameXX
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-#define readsonameXX readsoname32
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-#define __ELF_NATIVE_CLASS 32
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-#include "readelf2.c"
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-
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-#undef __ELF_NATIVE_CLASS
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-#undef readsonameXX
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-#define readsonameXX readsoname64
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-#define __ELF_NATIVE_CLASS 64
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-#include "readelf2.c"
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+
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+
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+Elf32_Shdr * elf_find_section_type( int key, Elf32_Ehdr *ehdr)
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+{
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+ int j;
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+ Elf32_Shdr *shdr = (Elf32_Shdr *)(ehdr->e_shoff + (char *)ehdr);
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+ for (j = ehdr->e_shnum; --j>=0; ++shdr) {
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+ if (shdr->sh_type == key) {
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+ return shdr;
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+ }
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+ }
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+ return 0;
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+}
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+
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+Elf32_Phdr * elf_find_phdr_type( int type, Elf32_Ehdr *ehdr)
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+{
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+ int j;
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+ Elf32_Phdr *phdr = (Elf32_Phdr *)(ehdr->e_phoff + (char *)ehdr);
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+ for (j = ehdr->e_phnum; --j>=0; ++phdr) {
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+ if (type==phdr->p_type) {
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+ return phdr;
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+ }
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+ }
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+ return 0;
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+}
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+
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+/* Returns value if return_val==1, ptr otherwise */
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+void * elf_find_dynamic(int const key, Elf32_Dyn *dynp,
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+ Elf32_Ehdr *ehdr, int return_val)
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+{
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+ Elf32_Phdr *pt_text = elf_find_phdr_type(PT_LOAD, ehdr);
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+ unsigned tx_reloc = pt_text->p_vaddr - pt_text->p_offset;
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+ for (; DT_NULL!=dynp->d_tag; ++dynp) {
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+ if (dynp->d_tag == key) {
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+ if (return_val == 1)
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+ return (void *)dynp->d_un.d_val;
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+ else
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+ return (void *)(dynp->d_un.d_val - tx_reloc + (char *)ehdr );
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+ }
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+ }
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+ return 0;
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+}
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+
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+int check_elf_header(Elf32_Ehdr const *const ehdr)
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+{
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+ if (! ehdr || strncmp((void *)ehdr, ELFMAG, SELFMAG) != 0 ||
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+ ehdr->e_ident[EI_CLASS] != ELFCLASS32 ||
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+ ehdr->e_ident[EI_VERSION] != EV_CURRENT)
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+ {
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+ return 1;
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+ }
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+ return 0;
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+}
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+
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+#define ELFOSABI_NONE 0 /* UNIX System V ABI */
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+#define ELFOSABI_HPUX 1 /* HP-UX operating system */
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+#define ELFOSABI_NETBSD 2 /* NetBSD */
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+#define ELFOSABI_LINUX 3 /* GNU/Linux */
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+#define ELFOSABI_HURD 4 /* GNU/Hurd */
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+#define ELFOSABI_SOLARIS 6 /* Solaris */
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+#define ELFOSABI_AIX 7 /* AIX */
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+#define ELFOSABI_IRIX 8 /* IRIX */
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+#define ELFOSABI_FREEBSD 9 /* FreeBSD */
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+#define ELFOSABI_TRU64 10 /* TRU64 UNIX */
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+#define ELFOSABI_MODESTO 11 /* Novell Modesto */
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+#define ELFOSABI_OPENBSD 12 /* OpenBSD */
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+#define ELFOSABI_STANDALONE 255 /* Standalone (embedded) application */
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+#define ELFOSABI_ARM 97 /* ARM */
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+static void describe_elf_hdr(Elf32_Ehdr* ehdr)
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+{
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+ char *tmp, *tmp1;
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+
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+ switch (ehdr->e_type) {
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+ case ET_NONE: tmp = "None"; tmp1 = "NONE"; break;
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+ case ET_REL: tmp = "Relocatable File"; tmp1 = "REL"; break;
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+ case ET_EXEC: tmp = "Executable file"; tmp1 = "EXEC"; break;
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+ case ET_DYN: tmp = "Shared object file"; tmp1 = "DYN"; break;
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+ case ET_CORE: tmp = "Core file"; tmp1 = "CORE"; break;
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+ default:
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+ tmp = tmp1 = "Unknown";
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+ }
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+ printf( "Type:\t\t%s (%s)\n", tmp1, tmp);
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+
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+ switch (ehdr->e_machine) {
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+ case EM_NONE: tmp="No machine"; break;
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+ case EM_M32: tmp="AT&T WE 32100"; break;
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+ case EM_SPARC: tmp="SUN SPARC"; break;
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+ case EM_386: tmp="Intel 80386"; break;
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+ case EM_68K: tmp="Motorola m68k family"; break;
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+ case EM_88K: tmp="Motorola m88k family"; break;
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+ case EM_860: tmp="Intel 80860"; break;
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+ case EM_MIPS: tmp="MIPS R3000 big-endian"; break;
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+ case EM_S370: tmp="IBM System/370"; break;
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+ case EM_MIPS_RS3_LE: tmp="MIPS R3000 little-endian"; break;
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+ case EM_PARISC: tmp="HPPA"; break;
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+ case EM_VPP500: tmp="Fujitsu VPP500"; break;
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+ case EM_SPARC32PLUS: tmp="Sun's v8plus"; break;
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+ case EM_960: tmp="Intel 80960"; break;
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+ case EM_PPC: tmp="PowerPC"; break;
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+ case EM_PPC64: tmp="PowerPC 64-bit"; break;
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+ case EM_S390: tmp="IBM S390"; break;
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+ case EM_V800: tmp="NEC V800 series"; break;
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+ case EM_FR20: tmp="Fujitsu FR20"; break;
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+ case EM_RH32: tmp="TRW RH-32"; break;
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+ case EM_RCE: tmp="Motorola RCE"; break;
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+ case EM_ARM: tmp="ARM"; break;
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+ case EM_FAKE_ALPHA: tmp="Digital Alpha"; break;
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+ case EM_SH: tmp="Hitachi SH"; break;
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+ case EM_SPARCV9: tmp="SPARC v9 64-bit"; break;
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+ case EM_TRICORE: tmp="Siemens Tricore"; break;
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+ case EM_ARC: tmp="Argonaut RISC Core"; break;
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+ case EM_H8_300: tmp="Hitachi H8/300"; break;
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+ case EM_H8_300H: tmp="Hitachi H8/300H"; break;
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+ case EM_H8S: tmp="Hitachi H8S"; break;
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+ case EM_H8_500: tmp="Hitachi H8/500"; break;
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+ case EM_IA_64: tmp="Intel Merced"; break;
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+ case EM_MIPS_X: tmp="Stanford MIPS-X"; break;
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+ case EM_COLDFIRE: tmp="Motorola Coldfire"; break;
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+ case EM_68HC12: tmp="Motorola M68HC12"; break;
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+ case EM_MMA: tmp="Fujitsu MMA Multimedia Accelerator"; break;
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+ case EM_PCP: tmp="Siemens PCP"; break;
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+ case EM_NCPU: tmp="Sony nCPU embeeded RISC"; break;
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+ case EM_NDR1: tmp="Denso NDR1 microprocessor"; break;
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+ case EM_STARCORE: tmp="Motorola Start*Core processor"; break;
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+ case EM_ME16: tmp="Toyota ME16 processor"; break;
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+ case EM_ST100: tmp="STMicroelectronic ST100 processor"; break;
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+ case EM_TINYJ: tmp="Advanced Logic Corp. Tinyj emb.fam"; break;
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+ case EM_X86_64: tmp="AMD x86-64 architecture"; break;
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+ case EM_PDSP: tmp="Sony DSP Processor"; break;
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+ case EM_FX66: tmp="Siemens FX66 microcontroller"; break;
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+ case EM_ST9PLUS: tmp="STMicroelectronics ST9+ 8/16 mc"; break;
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+ case EM_ST7: tmp="STmicroelectronics ST7 8 bit mc"; break;
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+ case EM_68HC16: tmp="Motorola MC68HC16 microcontroller"; break;
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+ case EM_68HC11: tmp="Motorola MC68HC11 microcontroller"; break;
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+ case EM_68HC08: tmp="Motorola MC68HC08 microcontroller"; break;
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+ case EM_68HC05: tmp="Motorola MC68HC05 microcontroller"; break;
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+ case EM_SVX: tmp="Silicon Graphics SVx"; break;
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+ case EM_AT19: tmp="STMicroelectronics ST19 8 bit mc"; break;
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+ case EM_VAX: tmp="Digital VAX"; break;
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+ case EM_CRIS: tmp="Axis Communications 32-bit embedded processor"; break;
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+ case EM_JAVELIN: tmp="Infineon Technologies 32-bit embedded processor"; break;
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+ case EM_FIREPATH: tmp="Element 14 64-bit DSP Processor"; break;
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+ case EM_ZSP: tmp="LSI Logic 16-bit DSP Processor"; break;
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+ case EM_MMIX: tmp="Donald Knuth's educational 64-bit processor"; break;
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+ case EM_HUANY: tmp="Harvard University machine-independent object files"; break;
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+ case EM_PRISM: tmp="SiTera Prism"; break;
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+ case EM_AVR: tmp="Atmel AVR 8-bit microcontroller"; break;
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+ case EM_FR30: tmp="Fujitsu FR30"; break;
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+ case EM_D10V: tmp="Mitsubishi D10V"; break;
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+ case EM_D30V: tmp="Mitsubishi D30V"; break;
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+ case EM_V850: tmp="NEC v850"; break;
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+ case EM_M32R: tmp="Mitsubishi M32R"; break;
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+ case EM_MN10300: tmp="Matsushita MN10300"; break;
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+ case EM_MN10200: tmp="Matsushita MN10200"; break;
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+ case EM_PJ: tmp="picoJava"; break;
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+ default: tmp="unknown";
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+ }
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+ printf( "Machine:\t%s\n", tmp);
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+
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+ switch (ehdr->e_ident[EI_CLASS]) {
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+ case ELFCLASSNONE: tmp = "Invalid class"; break;
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+ case ELFCLASS32: tmp = "ELF32"; break;
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+ case ELFCLASS64: tmp = "ELF64"; break;
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+ default: tmp = "Unknown";
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+ }
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+ printf( "Class:\t\t%s\n", tmp);
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+
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+ switch (ehdr->e_ident[EI_DATA]) {
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+ case ELFDATANONE: tmp = "Invalid data encoding"; break;
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+ case ELFDATA2LSB: tmp = "2's complement, little endian"; break;
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+ case ELFDATA2MSB: tmp = "2's complement, big endian"; break;
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+ default: tmp = "Unknown";
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+ }
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+ printf( "Data:\t\t%s\n", tmp);
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+
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+ printf( "Version:\t%d %s\n", ehdr->e_ident[EI_VERSION],
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+ (ehdr->e_ident[EI_VERSION]==EV_CURRENT)?
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+ "(current)" : "(unknown: %lx)");
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+
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+ switch (ehdr->e_ident[EI_OSABI]) {
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+ case ELFOSABI_SYSV: tmp ="UNIX - System V"; break;
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+ case ELFOSABI_HPUX: tmp ="UNIX - HP-UX"; break;
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+ case ELFOSABI_NETBSD: tmp ="UNIX - NetBSD"; break;
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+ case ELFOSABI_LINUX: tmp ="UNIX - Linux"; break;
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+ case ELFOSABI_HURD: tmp ="GNU/Hurd"; break;
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+ case ELFOSABI_SOLARIS: tmp ="UNIX - Solaris"; break;
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+ case ELFOSABI_AIX: tmp ="UNIX - AIX"; break;
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+ case ELFOSABI_IRIX: tmp ="UNIX - IRIX"; break;
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+ case ELFOSABI_FREEBSD: tmp ="UNIX - FreeBSD"; break;
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+ case ELFOSABI_TRU64: tmp ="UNIX - TRU64"; break;
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+ case ELFOSABI_MODESTO: tmp ="Novell - Modesto"; break;
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+ case ELFOSABI_OPENBSD: tmp ="UNIX - OpenBSD"; break;
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+ case ELFOSABI_STANDALONE: tmp ="Standalone App"; break;
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+ case ELFOSABI_ARM: tmp ="ARM"; break;
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+ default: tmp = "Unknown";
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+ }
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+ printf( "OS/ABI:\t\t%s\n", tmp);
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+
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+ printf( "ABI Version:\t%d\n", ehdr->e_ident[EI_ABIVERSION]);
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+}
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+
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+static void list_needed_libraries(Elf32_Dyn* dynamic, char *strtab)
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+{
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+ Elf32_Dyn *dyns;
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+
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+ printf("Dependancies:\n");
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+ for (dyns=dynamic; dyns->d_tag!=DT_NULL; ++dyns) {
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+ if (dyns->d_tag == DT_NEEDED) {
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+ printf("\t%s\n", (char*)strtab + dyns->d_un.d_val);
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+ }
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+ }
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+}
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+
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+static void describe_elf_interpreter(Elf32_Ehdr* ehdr)
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+{
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+ Elf32_Phdr *phdr;
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+ phdr = elf_find_phdr_type(PT_INTERP, ehdr);
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+ if (phdr) {
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+ printf("Interpreter:\t%s\n", (char*)phdr->p_paddr);
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+ }
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+}
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+
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+int main( int argc, char** argv)
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+{
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+ /* map the .so, and locate interesting pieces */
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+ char *dynstr;
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+ char *thefilename = argv[1];
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+ FILE *thefile;
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+ struct stat statbuf;
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+ Elf32_Ehdr *ehdr = 0;
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+ Elf32_Shdr *dynsec;
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+ Elf32_Dyn *dynamic;
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+
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+
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+ if (!thefilename) {
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+ fprintf(stderr, "No filename specified.\n");
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+ exit(EXIT_FAILURE);
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+ }
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+ if (!(thefile = fopen(thefilename, "r"))) {
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+ perror(thefilename);
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+ exit(EXIT_FAILURE);
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+ }
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+ if (fstat(fileno(thefile), &statbuf) < 0) {
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+ perror(thefilename);
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+ exit(EXIT_FAILURE);
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+ }
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+
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+ if (statbuf.st_size < sizeof(Elf32_Ehdr))
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+ goto foo;
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+
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+ /* mmap the file to make reading stuff from it effortless */
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+ ehdr = (Elf32_Ehdr *)mmap(0, statbuf.st_size,
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+ PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(thefile), 0);
|
|
|
+
|
|
|
+foo:
|
|
|
+ /* Check if this looks legit */
|
|
|
+ if (check_elf_header(ehdr)) {
|
|
|
+ fprintf(stderr, "This does not appear to be an ELF file.\n");
|
|
|
+ exit(EXIT_FAILURE);
|
|
|
+ }
|
|
|
+ describe_elf_hdr(ehdr);
|
|
|
+ describe_elf_interpreter(ehdr);
|
|
|
+
|
|
|
+ dynsec = elf_find_section_type(SHT_DYNAMIC, ehdr);
|
|
|
+ if (dynsec) {
|
|
|
+ dynamic = (Elf32_Dyn*)(dynsec->sh_offset + (int)ehdr);
|
|
|
+ dynstr = (char *)elf_find_dynamic(DT_STRTAB, dynamic, ehdr, 0);
|
|
|
+ list_needed_libraries(dynamic, dynstr);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
Eric Andersen