Removed old elfloader.c and replaced with the current code (previously in elfloader-tmp.c)
This commit is contained in:
adamdunkels
parent
5d3baef0d2
commit
70170b65b6
1 changed files with 218 additions and 216 deletions
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@ -28,46 +28,30 @@
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: elfloader.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
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* @(#)$Id: elfloader.c,v 1.2 2006/12/18 11:55:42 adamdunkels Exp $
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*/
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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/unistd.h>
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#include "contiki.h"
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#include "loader/elfloader.h"
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#include "loader/elfloader-tmp.h"
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#include "loader/elfloader-arch.h"
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#include "cfs/cfs.h"
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#include "loader/symtab.h"
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#include "lib/malloc.h"
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#include "dev/rom.h"
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#include "dev/xmem.h"
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#if 0
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...) do {} while (0)
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#endif
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#define IMAX(a, b) (((a) > (b)) ? (a) : (b))
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static char *datamemory;
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#define TEXTADDRESS \
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(((uintptr_t)&_etext + (uintptr_t)&_edata - (uintptr_t)&__data_start \
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+ ROM_ERASE_UNIT_SIZE) & ~(ROM_ERASE_UNIT_SIZE - 1))
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#define EI_NIDENT 16
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typedef unsigned long elf32_word;
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typedef signed long elf32_sword;
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typedef unsigned short elf32_half;
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typedef unsigned long elf32_off;
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typedef unsigned long elf32_addr;
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struct elf32_ehdr {
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unsigned char e_ident[EI_NIDENT]; /* ident bytes */
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@ -129,12 +113,6 @@ struct elf32_rel {
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elf32_word r_info; /* Relocation type and symbol index. */
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};
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struct elf32_rela {
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elf32_addr r_offset; /* Location to be relocated. */
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elf32_word r_info; /* Relocation type and symbol index. */
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elf32_sword r_addend; /* Addend. */
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};
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struct elf32_sym {
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elf32_word st_name; /* String table index of name. */
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elf32_addr st_value; /* Symbol value. */
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@ -149,45 +127,118 @@ struct elf32_sym {
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struct relevant_section {
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unsigned char number;
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//off_t offset;
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unsigned int offset;
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char *address;
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};
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char elfloader_unknown[30]; /* Name that caused link error. */
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struct process **elfloader_autostart_processes;
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static struct relevant_section bss, data, text;
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/*static unsigned char bss_sectionno, data_sectionno, text_sectionno;*/
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static const unsigned char elf_magic_header[] =
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const static unsigned char elf_magic_header[] =
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{0x7f, 0x45, 0x4c, 0x46, /* 0x7f, 'E', 'L', 'F' */
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0x01, /* Only 32-bit objects. */
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0x01, /* Only LSB data. */
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0x01, /* Only ELF version 1. */
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};
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/*---------------------------------------------------------------------------*/
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static void
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seek_read(int fd, unsigned int offset, char *buf, int len)
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{
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cfs_seek(fd, offset);
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cfs_read(fd, buf, len);
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}
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/*---------------------------------------------------------------------------*/
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/*
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static void
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seek_write(int fd, unsigned int offset, char *buf, int len)
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{
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cfs_seek(fd, offset);
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cfs_write(fd, buf, len);
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}
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*/
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/*---------------------------------------------------------------------------*/
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static void *
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find_local_symbol(int fd, const char *symbol,
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unsigned int symtab, unsigned short symtabsize,
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unsigned int strtab)
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{
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struct elf32_sym s;
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unsigned int a;
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char name[30];
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struct relevant_section *sect;
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for(a = symtab; a < symtab + symtabsize; a += sizeof(s)) {
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seek_read(fd, a, (char *)&s, sizeof(s));
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if(s.st_name != 0) {
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seek_read(fd, strtab + s.st_name, name, sizeof(name));
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if(strcmp(name, symbol) == 0) {
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if(s.st_shndx == bss.number) {
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sect = &bss;
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} else if(s.st_shndx == data.number) {
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sect = &data;
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} else if(s.st_shndx == text.number) {
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sect = &text;
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} else {
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return NULL;
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}
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return &(sect->address[s.st_value]);
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}
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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static int
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relocate_section(off_t section, unsigned short size,
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off_t sectionaddr,
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off_t strs,
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off_t strtab,
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off_t symtab,
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char *mem)
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relocate_section(int fd,
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unsigned int section, unsigned short size,
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unsigned int sectionaddr,
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unsigned int strs,
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unsigned int strtab,
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unsigned int symtab, unsigned short symtabsize)
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{
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struct elf32_rela rela;
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struct elf32_sym s;
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off_t a;
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unsigned int a;
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char name[30];
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char *addr;
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struct relevant_section *sect;
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for(a = section; a < section + size; a += sizeof(struct elf32_rela)) {
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xmem_pread(&rela, sizeof(rela), a);
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xmem_pread(&s, sizeof(s),
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symtab + sizeof(struct elf32_sym) * ELF32_R_SYM(rela.r_info));
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if(s.st_name == 0) { /* Local symbol (static) */
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seek_read(fd, a, (char *)&rela, sizeof(rela));
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seek_read(fd,
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symtab + sizeof(struct elf32_sym) * ELF32_R_SYM(rela.r_info),
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(char *)&s, sizeof(s));
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if(s.st_name != 0) {
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seek_read(fd, strtab + s.st_name, name, sizeof(name));
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PRINTF("name: %s\n", name);
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addr = (char *)symtab_lookup(name);
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/* ADDED */
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if(addr == NULL) {
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PRINTF("name not found in global: %s\n", name);
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addr = find_local_symbol(fd, name, symtab, symtabsize, strtab);
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PRINTF("found address %p\n", addr);
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}
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if(addr == NULL) {
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if(s.st_shndx == bss.number) {
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sect = &bss;
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} else if(s.st_shndx == data.number) {
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sect = &data;
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} else if(s.st_shndx == text.number) {
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sect = &text;
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} else {
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PRINTF("elfloader unknown name: '%30s'\n", name);
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memcpy(elfloader_unknown, name, sizeof(elfloader_unknown));
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elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
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return ELFLOADER_SYMBOL_NOT_FOUND;
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}
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addr = sect->address;
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}
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} else {
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if(s.st_shndx == bss.number) {
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sect = &bss;
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} else if(s.st_shndx == data.number) {
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@ -197,77 +248,70 @@ relocate_section(off_t section, unsigned short size,
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} else {
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return ELFLOADER_SEGMENT_NOT_FOUND;
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}
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addr = sect->address + rela.r_addend;
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} else {
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xmem_pread(name, sizeof(name), strtab + s.st_name);
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addr = (char *)symtab_lookup(name);
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if(addr != NULL) { /* Global symbol */
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addr += rela.r_addend;
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} else { /* Exported symbol */
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if(s.st_shndx == bss.number) {
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sect = &bss;
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} else if(s.st_shndx == data.number) {
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sect = &data;
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} else if(s.st_shndx == text.number) {
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sect = &text;
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} else {
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PRINTF("elfloader unkown name: '%30s'\n", name);
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memcpy(elfloader_unknown, name, sizeof(elfloader_unknown));
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elfloader_unknown[sizeof(elfloader_unknown) - 1] = 0;
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return ELFLOADER_SYMBOL_NOT_FOUND;
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}
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addr = sect->address + s.st_value + rela.r_addend;
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}
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addr = sect->address;
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}
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memcpy(&mem[rela.r_offset], &addr, 2); /* Write reloc */
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elfloader_arch_relocate(fd, sectionaddr, &rela, addr);
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}
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return ELFLOADER_OK;
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}
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/*---------------------------------------------------------------------------*/
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typedef void (*PFV)(void);
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struct process *elfloader_loaded_process;
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void (*elfloader_fini)(void);
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static PFV
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find_init_and_fini(off_t symtab, unsigned short size, off_t strtab)
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static void *
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find_program_processes(int fd,
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unsigned int symtab, unsigned short size,
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unsigned int strtab)
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{
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struct elf32_sym s;
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off_t a;
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unsigned int a;
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char name[30];
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void (*elfloader_init)(void);
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elfloader_init = NULL;
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for(a = symtab; a < symtab + size; a += sizeof(s)) {
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xmem_pread(&s, sizeof(s), a);
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seek_read(fd, a, (char *)&s, sizeof(s));
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if(s.st_name != 0) {
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xmem_pread(name, sizeof(name), strtab + s.st_name);
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if(strcmp(name, "process_load") == 0) {
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elfloader_loaded_process =
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*(struct process **)&data.address[s.st_value];
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} else if (strcmp(name, "_init") == 0) {
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/* XXX Check segment == text. */
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elfloader_init = (PFV)&text.address[s.st_value];
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} else if (strcmp(name, "_fini") == 0) {
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/* XXX Check segment == text. */
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elfloader_fini = (PFV)&text.address[s.st_value];
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seek_read(fd, strtab + s.st_name, name, sizeof(name));
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if(strcmp(name, "autostart_processes") == 0) {
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return &data.address[s.st_value];
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}
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}
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}
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return elfloader_init;
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return NULL;
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/* return find_local_symbol(fd, "autostart_processes", symtab, size, strtab); */
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}
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/*---------------------------------------------------------------------------*/
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void
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elfloader_init(void)
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{
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elfloader_autostart_processes = NULL;
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}
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/*---------------------------------------------------------------------------*/
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#if 0
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static void
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print_chars(unsigned char *ptr, int num)
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{
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int i;
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for(i = 0; i < num; ++i) {
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PRINTF("%d", ptr[i]);
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if(i == num - 1) {
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PRINTF("\n");
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} else {
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PRINTF(", ");
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}
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}
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}
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#endif /* 0 */
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/*---------------------------------------------------------------------------*/
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int
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elfloader_load(off_t eepromaddr)
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elfloader_load(int fd)
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{
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struct elf32_ehdr ehdr;
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struct elf32_shdr shdr;
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struct elf32_shdr strtable;
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off_t strs;
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off_t shdrptr;
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off_t nameptr;
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unsigned int strs;
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unsigned int shdrptr;
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unsigned int nameptr;
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char name[12];
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int i;
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@ -279,35 +323,38 @@ elfloader_load(off_t eepromaddr)
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unsigned short strtaboff = 0, strtabsize;
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unsigned short bsssize = 0;
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struct process **process;
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int ret;
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void (*elfloader_init)(void);
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elfloader_unknown[0] = 0;
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/* The ELF header is located at the start of the buffer. */
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xmem_pread(&ehdr, sizeof(ehdr), eepromaddr);
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seek_read(fd, 0, (char *)&ehdr, sizeof(ehdr));
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/* print_chars(ehdr.e_ident, sizeof(elf_magic_header));
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print_chars(elf_magic_header, sizeof(elf_magic_header));*/
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/* Make sure that we have a correct and compatible ELF header. */
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if(memcmp(ehdr.e_ident, elf_magic_header, sizeof(elf_magic_header)) != 0) {
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PRINTF("ELF header problems\n");
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return ELFLOADER_BAD_ELF_HEADER;
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}
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/* Grab the section header. */
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shdrptr = eepromaddr + ehdr.e_shoff;
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xmem_pread(&shdr, sizeof(shdr), shdrptr);
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shdrptr = ehdr.e_shoff;
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seek_read(fd, shdrptr, (char *)&shdr, sizeof(shdr));
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/* Get the size and number of entries of the section header. */
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shdrsize = ehdr.e_shentsize;
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shdrnum = ehdr.e_shnum;
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/* The string table section: holds the names of the sections. */
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xmem_pread(&strtable, sizeof(strtable),
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eepromaddr + ehdr.e_shoff + shdrsize * ehdr.e_shstrndx);
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seek_read(fd, ehdr.e_shoff + shdrsize * ehdr.e_shstrndx,
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(char *)&strtable, sizeof(strtable));
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/* Get a pointer to the actual table of strings. This table holds
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the names of the sections, not the names of other symbols in the
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file (these are in the sybtam section). */
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strs = eepromaddr + strtable.sh_offset;
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strs = strtable.sh_offset;
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/* Go through all sections and pick out the relevant ones. The
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".text" segment holds the actual code from the ELF file, the
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@ -332,14 +379,14 @@ elfloader_load(off_t eepromaddr)
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bss.number = data.number = text.number = 0;
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shdrptr = eepromaddr + ehdr.e_shoff;
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shdrptr = ehdr.e_shoff;
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for(i = 0; i < shdrnum; ++i) {
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xmem_pread(&shdr, sizeof(shdr), shdrptr);
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seek_read(fd, shdrptr, (char *)&shdr, sizeof(shdr));
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/* The name of the section is contained in the strings table. */
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nameptr = strs + shdr.sh_name;
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xmem_pread(name, sizeof(name), nameptr);
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seek_read(fd, nameptr, name, sizeof(name));
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/* Match the name of the section with a predefined set of names
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(.text, .data, .bss, .rela.text, .rela.data, .symtab, and
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@ -349,7 +396,7 @@ elfloader_load(off_t eepromaddr)
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textoff = shdr.sh_offset;
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textsize = shdr.sh_size;
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text.number = i;
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//text.offset = eepromaddr + textoff;
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text.offset = textoff;
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} else if(strncmp(name, ".rela.text", 10) == 0) {
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textrelaoff = shdr.sh_offset;
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textrelasize = shdr.sh_size;
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@ -357,7 +404,7 @@ elfloader_load(off_t eepromaddr)
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dataoff = shdr.sh_offset;
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datasize = shdr.sh_size;
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data.number = i;
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//data.offset = eepromaddr + dataoff;
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data.offset = dataoff;
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} else if(strncmp(name, ".rela.data", 10) == 0) {
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datarelaoff = shdr.sh_offset;
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datarelasize = shdr.sh_size;
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@ -370,16 +417,13 @@ elfloader_load(off_t eepromaddr)
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} else if(strncmp(name, ".bss", 4) == 0) {
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bsssize = shdr.sh_size;
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bss.number = i;
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//bss.offset = 0;
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} else {
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PRINTF("elfloader: unknown '%12s' %d\n", name, shdrsize);
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bss.offset = 0;
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}
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/* Move on to the next section header. */
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shdrptr += shdrsize;
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}
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if(symtabsize == 0) {
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return ELFLOADER_NO_SYMTAB;
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}
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@ -390,102 +434,60 @@ elfloader_load(off_t eepromaddr)
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return ELFLOADER_NO_TEXT;
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}
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if(datamemory != NULL) {
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free(datamemory);
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}
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bss.address = (char *)elfloader_arch_allocate_ram(bsssize + datasize);
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data.address = (char *)bss.address + bsssize;
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text.address = (char *)elfloader_arch_allocate_rom(textsize);
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/* We are making semi-permanent allocations, first compact heap! */
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malloc_compact();
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datamemory = malloc(IMAX(textsize, datasize + bsssize));
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if(datamemory == NULL) {
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return ELFLOADER_DATA_TO_LARGE; /* XXX or text to large */
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}
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bss.address = (char *)datamemory;
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data.address = (char *)datamemory + bsssize;
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text.address = (char *)TEXTADDRESS;
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PRINTF("elfloader: copy text segment to RAM %p %p\n",
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datamemory, datamemory + textsize);
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xmem_pread(datamemory, textsize, eepromaddr + textoff);
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/* If we have text segment relocations, we process them. */
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PRINTF("elfloader: relocate text\n");
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if(textrelasize > 0) {
|
||||
PRINTF("elfloader: relocate text in RAM\n");
|
||||
ret = relocate_section(eepromaddr + textrelaoff, textrelasize,
|
||||
eepromaddr + textoff,
|
||||
ret = relocate_section(fd,
|
||||
textrelaoff, textrelasize,
|
||||
textoff,
|
||||
strs,
|
||||
eepromaddr + strtaboff,
|
||||
eepromaddr + symtaboff,
|
||||
datamemory);
|
||||
strtaboff,
|
||||
symtaboff, symtabsize);
|
||||
if(ret != ELFLOADER_OK) {
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
PRINTF("elfloader: copy text segment to ROM %p %p\n",
|
||||
text.address, text.address + textsize);
|
||||
rom_erase((textsize + ROM_ERASE_UNIT_SIZE) & ~(ROM_ERASE_UNIT_SIZE - 1),
|
||||
(uintptr_t)text.address);
|
||||
rom_pwrite(datamemory, textsize, (uintptr_t)text.address);
|
||||
|
||||
PRINTF("elfloader: copy data segment to RAM %p %p\n",
|
||||
data.address, data.address + datasize);
|
||||
xmem_pread(data.address, datasize, eepromaddr + dataoff);
|
||||
/* If we have any data segment relocations, we process them too. */
|
||||
PRINTF("elfloader: relocate data\n");
|
||||
if(datarelasize > 0) {
|
||||
PRINTF("elfloader: relocate data segment\n");
|
||||
ret = relocate_section(eepromaddr + datarelaoff, datarelasize,
|
||||
eepromaddr + dataoff,
|
||||
ret = relocate_section(fd,
|
||||
datarelaoff, datarelasize,
|
||||
dataoff,
|
||||
strs,
|
||||
eepromaddr + strtaboff,
|
||||
eepromaddr + symtaboff,
|
||||
data.address);
|
||||
strtaboff,
|
||||
symtaboff, symtabsize);
|
||||
if(ret != ELFLOADER_OK) {
|
||||
PRINTF("elfloader: data failed\n");
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
PRINTF("elfloader: zero bss %p %p\n", bss.address, bss.address + bsssize);
|
||||
/* Write text segment into flash and data segment into RAM. */
|
||||
cfs_seek(fd, textoff);
|
||||
elfloader_arch_write_text(fd, textsize, text.address);
|
||||
|
||||
memset(bss.address, 0, bsssize);
|
||||
datamemory = realloc(datamemory, datasize + bsssize);
|
||||
if(datamemory != bss.address) {
|
||||
free(bss.address);
|
||||
return ELFLOADER_BSS_TO_LARGE; /* XXX realloc moved data */
|
||||
}
|
||||
seek_read(fd, dataoff, data.address, datasize);
|
||||
|
||||
/* Find _init, _fini, and loaded_process. */
|
||||
elfloader_loaded_process = NULL;
|
||||
elfloader_fini = NULL;
|
||||
elfloader_init = find_init_and_fini(eepromaddr + symtaboff,
|
||||
symtabsize,
|
||||
eepromaddr + strtaboff);
|
||||
|
||||
if(elfloader_init != NULL) {
|
||||
PRINTF("init=%p fini=%p\n", elfloader_init, elfloader_fini);
|
||||
(*elfloader_init)();
|
||||
elfloader_loaded_process = NULL;
|
||||
return ELFLOADER_OK;
|
||||
}
|
||||
|
||||
if(elfloader_loaded_process != NULL) {
|
||||
PRINTF("elfloader: launch program\n");
|
||||
process_start(elfloader_loaded_process, NULL);
|
||||
elfloader_fini = NULL;
|
||||
PRINTF("elfloader: autostart search\n");
|
||||
process = find_local_symbol(fd, "autostart_processes", symtaboff, symtabsize, strtaboff);
|
||||
if(process != NULL) {
|
||||
PRINTF("elfloader: autostart found\n");
|
||||
elfloader_autostart_processes = process;
|
||||
return ELFLOADER_OK;
|
||||
} else {
|
||||
PRINTF("elfloader: no autostart\n");
|
||||
process = find_program_processes(fd, symtaboff, symtabsize, strtaboff);
|
||||
if(process != NULL) {
|
||||
PRINTF("elfloader: FOUND PRG\n");
|
||||
}
|
||||
return ELFLOADER_NO_STARTPOINT;
|
||||
}
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
void
|
||||
elfloader_unload(void)
|
||||
{
|
||||
if(elfloader_fini != NULL) {
|
||||
(*elfloader_fini)();
|
||||
elfloader_fini = NULL;
|
||||
} else if(elfloader_loaded_process != NULL) {
|
||||
process_exit(elfloader_loaded_process);
|
||||
elfloader_loaded_process = NULL;
|
||||
}
|
||||
if(datamemory != NULL) {
|
||||
free(datamemory);
|
||||
datamemory = NULL;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue