added support for elf32_rel relocation entries (earlier only elf32_rela)
added support for rodata section (x86 compability)
This commit is contained in:
fros4943
parent
98f8d160b3
commit
1e23eb29ba
|
|
@ -28,7 +28,7 @@
|
|||
*
|
||||
* This file is part of the Contiki operating system.
|
||||
*
|
||||
* @(#)$Id: elfloader.c,v 1.3 2006/12/18 12:11:15 adamdunkels Exp $
|
||||
* @(#)$Id: elfloader.c,v 1.4 2006/12/18 15:35:16 fros4943 Exp $
|
||||
*/
|
||||
|
||||
#include "contiki.h"
|
||||
|
|
@ -135,7 +135,7 @@ char elfloader_unknown[30]; /* Name that caused link error. */
|
|||
|
||||
struct process **elfloader_autostart_processes;
|
||||
|
||||
static struct relevant_section bss, data, text;
|
||||
static struct relevant_section bss, data, rodata, text;
|
||||
|
||||
const static unsigned char elf_magic_header[] =
|
||||
{0x7f, 0x45, 0x4c, 0x46, /* 0x7f, 'E', 'L', 'F' */
|
||||
|
|
@ -197,19 +197,30 @@ static int
|
|||
relocate_section(int fd,
|
||||
unsigned int section, unsigned short size,
|
||||
unsigned int sectionaddr,
|
||||
char *sectionbase,
|
||||
unsigned int strs,
|
||||
unsigned int strtab,
|
||||
unsigned int symtab, unsigned short symtabsize)
|
||||
unsigned int symtab, unsigned short symtabsize,
|
||||
unsigned char using_relas)
|
||||
{
|
||||
struct elf32_rela rela;
|
||||
/* sectionbase added; runtime start address of current section */
|
||||
struct elf32_rela rela; /* Now used both for rel and rela data! */
|
||||
int rel_size = 0;
|
||||
struct elf32_sym s;
|
||||
unsigned int a;
|
||||
char name[30];
|
||||
char *addr;
|
||||
struct relevant_section *sect;
|
||||
|
||||
/* determine correct relocation entry sizes */
|
||||
if(using_relas) {
|
||||
rel_size = sizeof(struct elf32_rela);
|
||||
} else {
|
||||
rel_size = sizeof(struct elf32_rel);
|
||||
}
|
||||
|
||||
for(a = section; a < section + size; a += sizeof(struct elf32_rela)) {
|
||||
seek_read(fd, a, (char *)&rela, sizeof(rela));
|
||||
for(a = section; a < section + size; a += rel_size) {
|
||||
seek_read(fd, a, (char *)&rela, rel_size);
|
||||
seek_read(fd,
|
||||
symtab + sizeof(struct elf32_sym) * ELF32_R_SYM(rela.r_info),
|
||||
(char *)&s, sizeof(s));
|
||||
|
|
@ -228,6 +239,8 @@ relocate_section(int fd,
|
|||
sect = &bss;
|
||||
} else if(s.st_shndx == data.number) {
|
||||
sect = &data;
|
||||
} else if(s.st_shndx == rodata.number) {
|
||||
sect = &rodata;
|
||||
} else if(s.st_shndx == text.number) {
|
||||
sect = &text;
|
||||
} else {
|
||||
|
|
@ -243,6 +256,8 @@ relocate_section(int fd,
|
|||
sect = &bss;
|
||||
} else if(s.st_shndx == data.number) {
|
||||
sect = &data;
|
||||
} else if(s.st_shndx == rodata.number) {
|
||||
sect = &rodata;
|
||||
} else if(s.st_shndx == text.number) {
|
||||
sect = &text;
|
||||
} else {
|
||||
|
|
@ -252,8 +267,12 @@ relocate_section(int fd,
|
|||
addr = sect->address;
|
||||
}
|
||||
|
||||
elfloader_arch_relocate(fd, sectionaddr, &rela, addr);
|
||||
|
||||
if (!using_relas) {
|
||||
/* copy addend to rela structure */
|
||||
seek_read(fd, sectionaddr + rela.r_offset, &rela.r_addend, 4);
|
||||
}
|
||||
|
||||
elfloader_arch_relocate(fd, sectionaddr, sectionbase, &rela, addr);
|
||||
}
|
||||
return ELFLOADER_OK;
|
||||
}
|
||||
|
|
@ -317,8 +336,10 @@ elfloader_load(int fd)
|
|||
int i;
|
||||
unsigned short shdrnum, shdrsize;
|
||||
|
||||
unsigned char using_relas = -1;
|
||||
unsigned short textoff = 0, textsize, textrelaoff = 0, textrelasize;
|
||||
unsigned short dataoff = 0, datasize, datarelaoff = 0, datarelasize;
|
||||
unsigned short rodataoff = 0, rodatasize, rodatarelaoff = 0, rodatarelasize;
|
||||
unsigned short symtaboff = 0, symtabsize;
|
||||
unsigned short strtaboff = 0, strtabsize;
|
||||
unsigned short bsssize = 0;
|
||||
|
|
@ -359,8 +380,8 @@ elfloader_load(int fd)
|
|||
/* Go through all sections and pick out the relevant ones. The
|
||||
".text" segment holds the actual code from the ELF file, the
|
||||
".data" segment contains initialized data, the ".bss" segment
|
||||
holds the size of the unitialized data segment. The ".rela.text"
|
||||
and ".rela.data" segments contains relocation information for the
|
||||
holds the size of the unitialized data segment. The ".rel[a].text"
|
||||
and ".rel[a].data" segments contains relocation information for the
|
||||
contents of the ".text" and ".data" segments, respectively. The
|
||||
".symtab" segment contains the symbol table for this file. The
|
||||
".strtab" segment points to the actual string names used by the
|
||||
|
|
@ -375,9 +396,9 @@ elfloader_load(int fd)
|
|||
/* Initialize the segment sizes to zero so that we can check if
|
||||
their sections was found in the file or not. */
|
||||
textsize = textrelasize = datasize = datarelasize =
|
||||
symtabsize = strtabsize = 0;
|
||||
rodatasize = rodatarelasize = symtabsize = strtabsize = 0;
|
||||
|
||||
bss.number = data.number = text.number = 0;
|
||||
bss.number = data.number = rodata.number = text.number = -1;
|
||||
|
||||
shdrptr = ehdr.e_shoff;
|
||||
for(i = 0; i < shdrnum; ++i) {
|
||||
|
|
@ -391,13 +412,19 @@ elfloader_load(int fd)
|
|||
/* Match the name of the section with a predefined set of names
|
||||
(.text, .data, .bss, .rela.text, .rela.data, .symtab, and
|
||||
.strtab). */
|
||||
/* added support for .rodata, .rel.text and .rel.data). */
|
||||
|
||||
if(strncmp(name, ".text", 5) == 0) {
|
||||
textoff = shdr.sh_offset;
|
||||
textsize = shdr.sh_size;
|
||||
text.number = i;
|
||||
text.offset = textoff;
|
||||
} else if(strncmp(name, ".rel.text", 9) == 0) {
|
||||
using_relas = 0;
|
||||
textrelaoff = shdr.sh_offset;
|
||||
textrelasize = shdr.sh_size;
|
||||
} else if(strncmp(name, ".rela.text", 10) == 0) {
|
||||
using_relas = 1;
|
||||
textrelaoff = shdr.sh_offset;
|
||||
textrelasize = shdr.sh_size;
|
||||
} else if(strncmp(name, ".data", 5) == 0) {
|
||||
|
|
@ -405,7 +432,28 @@ elfloader_load(int fd)
|
|||
datasize = shdr.sh_size;
|
||||
data.number = i;
|
||||
data.offset = dataoff;
|
||||
} else if(strncmp(name, ".rodata", 7) == 0) {
|
||||
/* read-only data handled the same way as regular text section */
|
||||
rodataoff = shdr.sh_offset;
|
||||
rodatasize = shdr.sh_size;
|
||||
rodata.number = i;
|
||||
rodata.offset = rodataoff;
|
||||
} else if(strncmp(name, ".rel.rodata", 11) == 0) {
|
||||
/* using elf32_rel instead of rela */
|
||||
using_relas = 0;
|
||||
rodatarelaoff = shdr.sh_offset;
|
||||
rodatarelasize = shdr.sh_size;
|
||||
} else if(strncmp(name, ".rela.rodata", 12) == 0) {
|
||||
using_relas = 1;
|
||||
rodatarelaoff = shdr.sh_offset;
|
||||
rodatarelasize = shdr.sh_size;
|
||||
} else if(strncmp(name, ".rel.data", 9) == 0) {
|
||||
/* using elf32_rel instead of rela */
|
||||
using_relas = 0;
|
||||
datarelaoff = shdr.sh_offset;
|
||||
datarelasize = shdr.sh_size;
|
||||
} else if(strncmp(name, ".rela.data", 10) == 0) {
|
||||
using_relas = 1;
|
||||
datarelaoff = shdr.sh_offset;
|
||||
datarelasize = shdr.sh_size;
|
||||
} else if(strncmp(name, ".symtab", 7) == 0) {
|
||||
|
|
@ -436,41 +484,66 @@ elfloader_load(int fd)
|
|||
|
||||
bss.address = (char *)elfloader_arch_allocate_ram(bsssize + datasize);
|
||||
data.address = (char *)bss.address + bsssize;
|
||||
text.address = (char *)elfloader_arch_allocate_rom(textsize);
|
||||
|
||||
text.address = (char *)elfloader_arch_allocate_rom(textsize + rodatasize);
|
||||
rodata.address = (char *)text.address + textsize;
|
||||
|
||||
|
||||
/* printf("bss base address: bss.address = 0x%08x\n", bss.address);
|
||||
printf("data base address: data.address = 0x%08x\n", data.address);
|
||||
printf("text base address: text.address = 0x%08x\n", text.address);
|
||||
printf("rodata base address: rodata.address = 0x%08x\n", rodata.address); */
|
||||
|
||||
|
||||
/* If we have text segment relocations, we process them. */
|
||||
PRINTF("elfloader: relocate text\n");
|
||||
if(textrelasize > 0) {
|
||||
ret = relocate_section(fd,
|
||||
ret = relocate_section(fd,
|
||||
textrelaoff, textrelasize,
|
||||
textoff,
|
||||
text.address,
|
||||
strs,
|
||||
strtaboff,
|
||||
symtaboff, symtabsize);
|
||||
symtaboff, symtabsize, using_relas);
|
||||
if(ret != ELFLOADER_OK) {
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
/* If we have any rodata segment relocations, we process them too. */
|
||||
PRINTF("elfloader: relocate rodata\n");
|
||||
if(rodatarelasize > 0) {
|
||||
ret = relocate_section(fd,
|
||||
rodatarelaoff, rodatarelasize,
|
||||
rodataoff,
|
||||
rodata.address,
|
||||
strs,
|
||||
strtaboff,
|
||||
symtaboff, symtabsize, using_relas);
|
||||
if(ret != ELFLOADER_OK) {
|
||||
PRINTF("elfloader: data failed\n");
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
/* If we have any data segment relocations, we process them too. */
|
||||
PRINTF("elfloader: relocate data\n");
|
||||
if(datarelasize > 0) {
|
||||
ret = relocate_section(fd,
|
||||
datarelaoff, datarelasize,
|
||||
dataoff,
|
||||
data.address,
|
||||
strs,
|
||||
strtaboff,
|
||||
symtaboff, symtabsize);
|
||||
symtaboff, symtabsize, using_relas);
|
||||
if(ret != ELFLOADER_OK) {
|
||||
PRINTF("elfloader: data failed\n");
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
/* Write text segment into flash and data segment into RAM. */
|
||||
cfs_seek(fd, textoff);
|
||||
elfloader_arch_write_text(fd, textsize, text.address);
|
||||
/* Write text and rodata segment into flash and data segment into RAM. */
|
||||
elfloader_arch_write_rom(fd, textoff, textsize, text.address);
|
||||
elfloader_arch_write_rom(fd, rodataoff, rodatasize, rodata.address);
|
||||
|
||||
memset(bss.address, 0, bsssize);
|
||||
seek_read(fd, dataoff, data.address, datasize);
|
||||
|
|
|
|||
Loading…
Reference in New Issue