--- /dev/null
+/* This file defines standard ELF types, structures, and macros.
+ Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ian Lance Taylor <ian@cygnus.com>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _ELF_H
+#define _ELF_H 1
+
+#include <stdint.h>
+
+/* Standard ELF types. */
+
+/* Type for a 16-bit quantity. */
+typedef uint16_t Elf32_Half;
+typedef uint16_t Elf64_Half;
+
+/* Types for signed and unsigned 32-bit quantities. */
+typedef uint32_t Elf32_Word;
+typedef int32_t Elf32_Sword;
+typedef uint32_t Elf64_Word;
+typedef int32_t Elf64_Sword;
+
+/* Types for signed and unsigned 64-bit quantities. */
+typedef uint64_t Elf32_Xword;
+typedef int64_t Elf32_Sxword;
+typedef uint64_t Elf64_Xword;
+typedef int64_t Elf64_Sxword;
+
+/* Type of addresses. */
+typedef uint32_t Elf32_Addr;
+typedef uint64_t Elf64_Addr;
+
+/* Type of file offsets. */
+typedef uint32_t Elf32_Off;
+typedef uint64_t Elf64_Off;
+
+/* Type for section indices, which are 16-bit quantities. */
+typedef uint16_t Elf32_Section;
+typedef uint16_t Elf64_Section;
+
+/* Type of symbol indices. */
+typedef uint32_t Elf32_Symndx;
+typedef uint64_t Elf64_Symndx;
+
+
+/* The ELF file header. This appears at the start of every ELF file. */
+
+#define EI_NIDENT (16)
+
+typedef struct
+{
+ unsigned char e_ident[EI_NIDENT]; /** Magic number and other info */
+ Elf32_Half e_type; /** Object file type */
+ Elf32_Half e_machine; /** Architecture */
+ Elf32_Word e_version; /** Object file version */
+ Elf32_Addr e_entry; /** Entry point virtual address */
+ Elf32_Off e_phoff; /** Program header table file offset */
+ Elf32_Off e_shoff; /** Section header table file offset */
+ Elf32_Word e_flags; /** Processor-specific flags */
+ Elf32_Half e_ehsize; /** ELF header size in bytes */
+ Elf32_Half e_phentsize; /** Program header table entry size */
+ Elf32_Half e_phnum; /** Program header table entry count */
+ Elf32_Half e_shentsize; /** Section header table entry size */
+ Elf32_Half e_shnum; /** Section header table entry count */
+ Elf32_Half e_shstrndx; /** Section header string table index */
+} Elf32_Ehdr;
+
+/* Fields in the e_ident array. The EI_* macros are indices into the
+ array. The macros under each EI_* macro are the values the byte
+ may have. */
+
+#define EI_MAG0 0 /* File identification byte 0 index */
+#define ELFMAG0 0x7f /* Magic number byte 0 */
+
+#define EI_MAG1 1 /* File identification byte 1 index */
+#define ELFMAG1 'E' /* Magic number byte 1 */
+
+#define EI_MAG2 2 /* File identification byte 2 index */
+#define ELFMAG2 'L' /* Magic number byte 2 */
+
+#define EI_MAG3 3 /* File identification byte 3 index */
+#define ELFMAG3 'F' /* Magic number byte 3 */
+
+/* Conglomeration of the identification bytes, for easy testing as a word. */
+#define ELFMAG "\177ELF"
+#define SELFMAG 4
+
+#define EI_CLASS 4 /* File class byte index */
+#define ELFCLASSNONE 0 /* Invalid class */
+#define ELFCLASS32 1 /* 32-bit objects */
+#define ELFCLASS64 2 /* 64-bit objects */
+#define ELFCLASSNUM 3
+
+#define EI_DATA 5 /* Data encoding byte index */
+#define ELFDATANONE 0 /* Invalid data encoding */
+#define ELFDATA2LSB 1 /* 2's complement, little endian */
+#define ELFDATA2MSB 2 /* 2's complement, big endian */
+#define ELFDATANUM 3
+
+#define EI_VERSION 6 /* File version byte index */
+ /* Value must be EV_CURRENT */
+
+#define EI_OSABI 7 /* OS ABI identification */
+#define ELFOSABI_SYSV 0 /* UNIX System V ABI */
+#define ELFOSABI_HPUX 1 /* HP-UX */
+#define ELFOSABI_FREEBSD 9 /* Free BSD */
+#define ELFOSABI_ARM 97 /* ARM */
+#define ELFOSABI_STANDALONE 255 /* Standalone (embedded) application */
+
+#define EI_ABIVERSION 8 /* ABI version */
+
+#define EI_PAD 9 /* Byte index of padding bytes */
+
+/* Legal values for e_type (object file type). */
+
+#define ET_NONE 0 /* No file type */
+#define ET_REL 1 /* Relocatable file */
+#define ET_EXEC 2 /* Executable file */
+#define ET_DYN 3 /* Shared object file */
+#define ET_CORE 4 /* Core file */
+#define ET_NUM 5 /* Number of defined types */
+#define ET_LOPROC 0xff00 /* Processor-specific */
+#define ET_HIPROC 0xffff /* Processor-specific */
+
+/* Legal values for e_machine (architecture). */
+
+#define EM_NONE 0 /* No machine */
+#define EM_M32 1 /* AT&T WE 32100 */
+#define EM_SPARC 2 /* SUN SPARC */
+#define EM_386 3 /* Intel 80386 */
+#define EM_68K 4 /* Motorola m68k family */
+#define EM_88K 5 /* Motorola m88k family */
+#define EM_486 6 /* Intel 80486 */
+#define EM_860 7 /* Intel 80860 */
+#define EM_MIPS 8 /* MIPS R3000 big-endian */
+#define EM_S370 9 /* Amdahl */
+#define EM_MIPS_RS4_BE 10 /* MIPS R4000 big-endian */
+#define EM_RS6000 11 /* RS6000 */
+
+#define EM_PARISC 15 /* HPPA */
+#define EM_nCUBE 16 /* nCUBE */
+#define EM_VPP500 17 /* Fujitsu VPP500 */
+#define EM_SPARC32PLUS 18 /* Sun's "v8plus" */
+#define EM_960 19 /* Intel 80960 */
+#define EM_PPC 20 /* PowerPC */
+
+#define EM_V800 36 /* NEC V800 series */
+#define EM_FR20 37 /* Fujitsu FR20 */
+#define EM_RH32 38 /* TRW RH32 */
+#define EM_MMA 39 /* Fujitsu MMA */
+#define EM_ARM 40 /* ARM */
+#define EM_FAKE_ALPHA 41 /* Digital Alpha */
+#define EM_SH 42 /* Hitachi SH */
+#define EM_SPARCV9 43 /* SPARC v9 64-bit */
+#define EM_TRICORE 44 /* Siemens Tricore */
+#define EM_ARC 45 /* Argonaut RISC Core */
+#define EM_H8_300 46 /* Hitachi H8/300 */
+#define EM_H8_300H 47 /* Hitachi H8/300H */
+#define EM_H8S 48 /* Hitachi H8S */
+#define EM_H8_500 49 /* Hitachi H8/500 */
+#define EM_IA_64 50 /* Intel Merced */
+#define EM_MIPS_X 51 /* Stanford MIPS-X */
+#define EM_COLDFIRE 52 /* Motorola Coldfire */
+#define EM_68HC12 53 /* Motorola M68HC12 */
+#define EM_NUM 54
+
+/* If it is necessary to assign new unofficial EM_* values, please
+ pick large random numbers (0x8523, 0xa7f2, etc.) to minimize the
+ chances of collision with official or non-GNU unofficial values. */
+
+#define EM_ALPHA 0x9026
+
+/* Legal values for e_version (version). */
+
+#define EV_NONE 0 /* Invalid ELF version */
+#define EV_CURRENT 1 /* Current version */
+#define EV_NUM 2
+
+/* Section header. */
+
+typedef struct
+{
+ Elf32_Word sh_name; /** Section name (string tbl index) */
+ Elf32_Word sh_type; /** Section type */
+ Elf32_Word sh_flags; /** Section flags */
+ Elf32_Addr sh_addr; /** Section virtual addr at execution */
+ Elf32_Off sh_offset; /** Section file offset */
+ Elf32_Word sh_size; /** Section size in bytes */
+ Elf32_Word sh_link; /** Link to another section */
+ Elf32_Word sh_info; /** Additional section information */
+ Elf32_Word sh_addralign; /** Section alignment */
+ Elf32_Word sh_entsize; /** Entry size if section holds table */
+} Elf32_Shdr;
+
+/* Special section indices. */
+
+#define SHN_UNDEF 0 /* Undefined section */
+#define SHN_LORESERVE 0xff00 /* Start of reserved indices */
+#define SHN_LOPROC 0xff00 /* Start of processor-specific */
+#define SHN_HIPROC 0xff1f /* End of processor-specific */
+#define SHN_ABS 0xfff1 /* Associated symbol is absolute */
+#define SHN_COMMON 0xfff2 /* Associated symbol is common */
+#define SHN_HIRESERVE 0xffff /* End of reserved indices */
+
+/* Legal values for sh_type (section type). */
+
+#define SHT_NULL 0 /* Section header table entry unused */
+#define SHT_PROGBITS 1 /* Program data */
+#define SHT_SYMTAB 2 /* Symbol table */
+#define SHT_STRTAB 3 /* String table */
+#define SHT_RELA 4 /* Relocation entries with addends */
+#define SHT_HASH 5 /* Symbol hash table */
+#define SHT_DYNAMIC 6 /* Dynamic linking information */
+#define SHT_NOTE 7 /* Notes */
+#define SHT_NOBITS 8 /* Program space with no data (bss) */
+#define SHT_REL 9 /* Relocation entries, no addends */
+#define SHT_SHLIB 10 /* Reserved */
+#define SHT_DYNSYM 11 /* Dynamic linker symbol table */
+#define SHT_NUM 12 /* Number of defined types. */
+#define SHT_LOOS 0x60000000 /* Start OS-specific */
+#define SHT_LOSUNW 0x6ffffffb /* Sun-specific low bound. */
+#define SHT_SUNW_COMDAT 0x6ffffffb
+#define SHT_SUNW_syminfo 0x6ffffffc
+#define SHT_GNU_verdef 0x6ffffffd /* Version definition section. */
+#define SHT_GNU_verneed 0x6ffffffe /* Version needs section. */
+#define SHT_GNU_versym 0x6fffffff /* Version symbol table. */
+#define SHT_HISUNW 0x6fffffff /* Sun-specific high bound. */
+#define SHT_HIOS 0x6fffffff /* End OS-specific type */
+#define SHT_LOPROC 0x70000000 /* Start of processor-specific */
+#define SHT_HIPROC 0x7fffffff /* End of processor-specific */
+#define SHT_LOUSER 0x80000000 /* Start of application-specific */
+#define SHT_HIUSER 0x8fffffff /* End of application-specific */
+
+/* Legal values for sh_flags (section flags). */
+
+#define SHF_WRITE (1 << 0) /* Writable */
+#define SHF_ALLOC (1 << 1) /* Occupies memory during execution */
+#define SHF_EXECINSTR (1 << 2) /* Executable */
+#define SHF_MASKPROC 0xf0000000 /* Processor-specific */
+
+/* --- Simplified ELF header --- */
+typedef struct simple_elf {
+ const char * e_fname; /* filename of binary */
+ unsigned long e_entry; /* entry point virtual address */
+ unsigned long e_txtoff; /* offset of text segment in file */
+ unsigned long e_txtlen; /* length of text segment in bytes */
+ unsigned long e_txtstart; /* start of text segment virtual address */
+ unsigned long e_datoff; /* offset of data segment in file */
+ unsigned long e_datlen; /* length of data segment in bytes */
+ unsigned long e_datstart; /* start of data segment in virtual memory */
+ unsigned long e_rodatoff; /* offset of rodata segment in file */
+ unsigned long e_rodatlen; /* length of rodata segment in bytes */
+ unsigned long e_rodatstart; /* start of rodata segment in virtual memory*/
+ unsigned long e_bsslen; /* length of bss segment in bytes */
+} simple_elf_t;
+
+ /* --- Defines --- */
+#define NMAGIC 0410 /* 0x108 */
+#define N_MAGIC(exec) ((exec).a_midmag & 0xffff)
+#define N_BADMAG(x) (N_MAGIC(x) != NMAGIC)
+
+#define ELF_NOTELF -1
+#define ELF_SUCCESS 0
+#define NOT_PRESENT -2
+
+/*
+ * elf function prototypes
+ */
+extern int getbytes( const char *filename, int offset, int size, char *buf);
+extern int elf_load_helper( simple_elf_t *se_hdr, const char *fname );
+extern int elf_check_header( const char *fname );
+
+#endif /* elf.h */
--- /dev/null
+#include <string.h>
+#include <stdio.h>
+#include "elf.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <termios.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#define FATAL do { fprintf(stderr, "Error at %s:%d (%d) [%s]\n", \
+ __FILE__, __LINE__, errno, strerror(errno)); exit(1); } while(0)
+
+#define MAP_SIZE 131072
+#define MAP_MASK (4096 - 1)
+
+char * snarf_file(char * fname) {
+
+ int fd = open(fname, O_RDONLY);
+ if (fd < 0) FATAL;
+
+ struct stat st;
+ if (fstat(fd, &st) < 0) FATAL;
+
+ char * buf = malloc(st.st_size);
+ if (!buf) FATAL;
+ if (read(fd, buf, st.st_size) != st.st_size) FATAL;
+
+ printf("Loaded %d bytes.\n", st.st_size);
+ return buf;
+}
+
+void dump_to_ram (void * src, int target, int size) {
+
+ printf("Copying %d bytes to 0x%08x...\n", size, target);
+
+ int fd = open("/dev/mem", O_RDWR | O_SYNC);
+ if (fd < 0) FATAL;
+
+ void * map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, target & ~MAP_MASK);
+
+ if (map_base == (void *) -1) FATAL;
+
+ void * virt_addr = map_base + (target & MAP_MASK);
+ memcpy(virt_addr, src, size);
+
+}
+
+static const unsigned char elf_ident[4] = { 0x7F, 'E', 'L', 'F' };
+
+int load_elf (char * buf) {
+
+ Elf32_Ehdr * elf_hdr = (Elf32_Ehdr *) buf;
+ Elf32_Shdr * elf_sec_hdrs = (Elf32_Shdr *) (buf + elf_hdr->e_shoff);
+
+ if (memcmp(elf_hdr->e_ident, elf_ident, sizeof(elf_ident))) FATAL;
+ if (elf_hdr->e_type != ET_EXEC) FATAL;
+ if (elf_hdr->e_machine != EM_386) FATAL;
+ if (elf_hdr->e_version != EV_CURRENT) FATAL;
+
+ char * string_table = buf + elf_sec_hdrs[elf_hdr->e_shstrndx].sh_offset;
+
+ int i;
+ for (i = 0; i < elf_hdr->e_shnum; i++) {
+ if (elf_sec_hdrs[i].sh_name == SHN_UNDEF) {
+ continue;
+ }
+
+ char * section_name = string_table + elf_sec_hdrs[i].sh_name;
+
+ if (!(elf_sec_hdrs[i].sh_flags & SHF_ALLOC)) {
+ printf("Skipping %s...\n", section_name);
+ continue;
+ }
+
+ printf("Loading %s...\n", section_name);
+
+ dump_to_ram(buf + elf_sec_hdrs[i].sh_offset,
+ elf_sec_hdrs[i].sh_addr,
+ elf_sec_hdrs[i].sh_size);
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv) {
+ if (argc != 2) {
+ printf("Usage: %s elffile\n", argv[0]);
+ return 1;
+ }
+
+ printf("Loading file...\n");
+
+ char * buf = snarf_file(argv[1]);
+ load_elf(buf);
+
+ return 0;
+}
+
git.joshuawise.com / netwatch.git / commitdiff