added support for elf32_rel relocation entries (earlier only elf32_rela)
added support for rodata section (x86 compability)
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fros4943
parent
98f8d160b3
commit
1e23eb29ba
@ -28,7 +28,7 @@
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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 1.3 2006/12/18 12:11:15 adamdunkels Exp $
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* @(#)$Id: elfloader.c,v 1.4 2006/12/18 15:35:16 fros4943 Exp $
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*/
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#include "contiki.h"
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@ -135,7 +135,7 @@ 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 struct relevant_section bss, data, rodata, text;
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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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@ -197,19 +197,30 @@ static int
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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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char *sectionbase,
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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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unsigned int symtab, unsigned short symtabsize,
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unsigned char using_relas)
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{
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struct elf32_rela rela;
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/* sectionbase added; runtime start address of current section */
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struct elf32_rela rela; /* Now used both for rel and rela data! */
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int rel_size = 0;
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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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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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seek_read(fd, a, (char *)&rela, sizeof(rela));
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/* determine correct relocation entry sizes */
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if(using_relas) {
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rel_size = sizeof(struct elf32_rela);
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} else {
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rel_size = sizeof(struct elf32_rel);
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}
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for(a = section; a < section + size; a += rel_size) {
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seek_read(fd, a, (char *)&rela, rel_size);
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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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@ -228,6 +239,8 @@ relocate_section(int fd,
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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 == rodata.number) {
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sect = &rodata;
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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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@ -243,6 +256,8 @@ relocate_section(int fd,
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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 == rodata.number) {
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sect = &rodata;
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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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@ -252,8 +267,12 @@ relocate_section(int fd,
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addr = sect->address;
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}
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elfloader_arch_relocate(fd, sectionaddr, &rela, addr);
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if (!using_relas) {
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/* copy addend to rela structure */
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seek_read(fd, sectionaddr + rela.r_offset, &rela.r_addend, 4);
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}
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elfloader_arch_relocate(fd, sectionaddr, sectionbase, &rela, addr);
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}
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return ELFLOADER_OK;
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}
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@ -317,8 +336,10 @@ elfloader_load(int fd)
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int i;
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unsigned short shdrnum, shdrsize;
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unsigned char using_relas = -1;
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unsigned short textoff = 0, textsize, textrelaoff = 0, textrelasize;
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unsigned short dataoff = 0, datasize, datarelaoff = 0, datarelasize;
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unsigned short rodataoff = 0, rodatasize, rodatarelaoff = 0, rodatarelasize;
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unsigned short symtaboff = 0, symtabsize;
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unsigned short strtaboff = 0, strtabsize;
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unsigned short bsssize = 0;
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@ -359,8 +380,8 @@ elfloader_load(int fd)
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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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".data" segment contains initialized data, the ".bss" segment
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holds the size of the unitialized data segment. The ".rela.text"
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and ".rela.data" segments contains relocation information for the
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holds the size of the unitialized data segment. The ".rel[a].text"
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and ".rel[a].data" segments contains relocation information for the
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contents of the ".text" and ".data" segments, respectively. The
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".symtab" segment contains the symbol table for this file. The
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".strtab" segment points to the actual string names used by the
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@ -375,9 +396,9 @@ elfloader_load(int fd)
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/* Initialize the segment sizes to zero so that we can check if
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their sections was found in the file or not. */
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textsize = textrelasize = datasize = datarelasize =
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symtabsize = strtabsize = 0;
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rodatasize = rodatarelasize = symtabsize = strtabsize = 0;
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bss.number = data.number = text.number = 0;
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bss.number = data.number = rodata.number = text.number = -1;
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shdrptr = ehdr.e_shoff;
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for(i = 0; i < shdrnum; ++i) {
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@ -391,13 +412,19 @@ elfloader_load(int fd)
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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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.strtab). */
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/* added support for .rodata, .rel.text and .rel.data). */
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if(strncmp(name, ".text", 5) == 0) {
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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 = textoff;
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} else if(strncmp(name, ".rel.text", 9) == 0) {
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using_relas = 0;
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textrelaoff = shdr.sh_offset;
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textrelasize = shdr.sh_size;
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} else if(strncmp(name, ".rela.text", 10) == 0) {
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using_relas = 1;
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textrelaoff = shdr.sh_offset;
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textrelasize = shdr.sh_size;
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} else if(strncmp(name, ".data", 5) == 0) {
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@ -405,7 +432,28 @@ elfloader_load(int fd)
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datasize = shdr.sh_size;
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data.number = i;
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data.offset = dataoff;
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} else if(strncmp(name, ".rodata", 7) == 0) {
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/* read-only data handled the same way as regular text section */
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rodataoff = shdr.sh_offset;
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rodatasize = shdr.sh_size;
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rodata.number = i;
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rodata.offset = rodataoff;
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} else if(strncmp(name, ".rel.rodata", 11) == 0) {
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/* using elf32_rel instead of rela */
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using_relas = 0;
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rodatarelaoff = shdr.sh_offset;
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rodatarelasize = shdr.sh_size;
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} else if(strncmp(name, ".rela.rodata", 12) == 0) {
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using_relas = 1;
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rodatarelaoff = shdr.sh_offset;
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rodatarelasize = shdr.sh_size;
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} else if(strncmp(name, ".rel.data", 9) == 0) {
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/* using elf32_rel instead of rela */
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using_relas = 0;
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datarelaoff = shdr.sh_offset;
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datarelasize = shdr.sh_size;
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} else if(strncmp(name, ".rela.data", 10) == 0) {
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using_relas = 1;
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datarelaoff = shdr.sh_offset;
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datarelasize = shdr.sh_size;
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} else if(strncmp(name, ".symtab", 7) == 0) {
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@ -436,41 +484,66 @@ elfloader_load(int fd)
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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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text.address = (char *)elfloader_arch_allocate_rom(textsize + rodatasize);
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rodata.address = (char *)text.address + textsize;
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/* printf("bss base address: bss.address = 0x%08x\n", bss.address);
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printf("data base address: data.address = 0x%08x\n", data.address);
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printf("text base address: text.address = 0x%08x\n", text.address);
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printf("rodata base address: rodata.address = 0x%08x\n", rodata.address); */
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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) {
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ret = relocate_section(fd,
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ret = relocate_section(fd,
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textrelaoff, textrelasize,
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textoff,
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text.address,
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strs,
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strtaboff,
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symtaboff, symtabsize);
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symtaboff, symtabsize, using_relas);
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if(ret != ELFLOADER_OK) {
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return ret;
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}
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}
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/* If we have any rodata segment relocations, we process them too. */
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PRINTF("elfloader: relocate rodata\n");
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if(rodatarelasize > 0) {
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ret = relocate_section(fd,
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rodatarelaoff, rodatarelasize,
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rodataoff,
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rodata.address,
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strs,
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strtaboff,
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symtaboff, symtabsize, using_relas);
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if(ret != ELFLOADER_OK) {
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PRINTF("elfloader: data failed\n");
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return ret;
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}
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}
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/* If we have any data segment relocations, we process them too. */
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PRINTF("elfloader: relocate data\n");
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if(datarelasize > 0) {
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ret = relocate_section(fd,
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datarelaoff, datarelasize,
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dataoff,
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data.address,
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strs,
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strtaboff,
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symtaboff, symtabsize);
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symtaboff, symtabsize, using_relas);
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if(ret != ELFLOADER_OK) {
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PRINTF("elfloader: data failed\n");
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return ret;
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}
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}
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/* Write text segment into flash and data segment into RAM. */
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cfs_seek(fd, textoff);
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elfloader_arch_write_text(fd, textsize, text.address);
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/* Write text and rodata segment into flash and data segment into RAM. */
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elfloader_arch_write_rom(fd, textoff, textsize, text.address);
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elfloader_arch_write_rom(fd, rodataoff, rodatasize, rodata.address);
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memset(bss.address, 0, bsssize);
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seek_read(fd, dataoff, data.address, datasize);
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