x86 elf loader implementation (only 2 common types).
depends on a few not-yet-commited files
This commit is contained in:
fros4943
parent
b12713093f
commit
b8bcf2ab59
1 changed files with 136 additions and 0 deletions
136
core/loader/elfloader-x86.c
Normal file
136
core/loader/elfloader-x86.c
Normal file
|
|
@ -0,0 +1,136 @@
|
|||
/*
|
||||
* Copyright (c) 2005, Swedish Institute of Computer Science
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* This file is part of the Contiki operating system.
|
||||
*
|
||||
* @(#)$Id: elfloader-x86.c,v 1.1 2006/10/25 10:53:31 fros4943 Exp $
|
||||
*/
|
||||
#include "elfloader-arch.h"
|
||||
#include <sys/mman.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdio.h>
|
||||
|
||||
#define R_386_NONE 0
|
||||
#define R_386_32 1
|
||||
#define R_386_PC32 2
|
||||
#define R_386_GOT32 3
|
||||
#define R_386_PLT32 4
|
||||
#define R_386_COPY 5
|
||||
#define R_386_GLOB_DATA 6
|
||||
#define R_386_JMP_SLOT 7
|
||||
#define R_386_RELATIVE 8
|
||||
#define R_386_GOTOFF 9
|
||||
#define R_386_GOTPC 10
|
||||
|
||||
#define ELF32_R_TYPE(info) ((unsigned char)(info))
|
||||
|
||||
static char datamemory[ELFLOADER_DATAMEMORY_SIZE];
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
void *
|
||||
elfloader_arch_allocate_ram(int size)
|
||||
{
|
||||
return (void *)datamemory;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
void *
|
||||
elfloader_arch_allocate_rom(int size)
|
||||
{
|
||||
int fd = open("/dev/zero", O_RDWR);
|
||||
char *mem = mmap(0, ELFLOADER_TEXTMEMORY_SIZE, PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
|
||||
return mem;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
void
|
||||
elfloader_arch_write_text(int fd, unsigned int size, char *mem)
|
||||
{
|
||||
cfs_read(fd, (unsigned char *)mem, size);
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
void
|
||||
elfloader_arch_relocate(int fd, unsigned int sectionoffset, char *sectionaddress,
|
||||
struct elf32_rela *rela, char *addr)
|
||||
{
|
||||
unsigned int type;
|
||||
|
||||
/*
|
||||
Given value addr is S
|
||||
|
||||
S = runtime address of destination = addr
|
||||
A = rela->r_addend
|
||||
P = absolute address of relocation (section base address and rela->r_offset)
|
||||
*/
|
||||
|
||||
type = ELF32_R_TYPE(rela->r_info);
|
||||
|
||||
switch(type) {
|
||||
case R_386_NONE:
|
||||
case R_386_COPY:
|
||||
/* printf("elfloader-x86.c: relocation calculation completed (none) %d\n", type); */
|
||||
break;
|
||||
case R_386_32:
|
||||
addr += rela->r_addend; /* +A */
|
||||
|
||||
cfs_seek(fd, sectionoffset + rela->r_offset);
|
||||
cfs_write(fd, (char *)&addr, 4);
|
||||
/*printf("elfloader-x86.c: performed relocation type S + A (%d)\n", type);*/
|
||||
break;
|
||||
case R_386_PC32:
|
||||
addr -= (sectionaddress + rela->r_offset); /* -P */
|
||||
addr += rela->r_addend; /* +A */
|
||||
|
||||
cfs_seek(fd, sectionoffset + rela->r_offset);
|
||||
cfs_write(fd, (char *)&addr, 4);
|
||||
/*printf("elfloader-x86.c: performed relocation type S + A - P (%d)\n", type);*/
|
||||
break;
|
||||
case R_386_GOT32:
|
||||
printf("elfloader-x86.c: unsupported relocation type G + A - P (%d)\n", type);
|
||||
break;
|
||||
case R_386_PLT32:
|
||||
printf("elfloader-x86.c: unsupported relocation type L + A - P (%d)\n", type);
|
||||
break;
|
||||
case R_386_GLOB_DATA:
|
||||
case R_386_JMP_SLOT:
|
||||
printf("elfloader-x86.c: unsupported relocation type S (%d)\n", type);
|
||||
break;
|
||||
case R_386_RELATIVE:
|
||||
printf("elfloader-x86.c: unsupported relocation type B + A (%d)\n", type);
|
||||
break;
|
||||
case R_386_GOTOFF:
|
||||
printf("elfloader-x86.c: unsupported relocation type S + A - GOT (%d)\n", type);
|
||||
break;
|
||||
case R_386_GOTPC:
|
||||
printf("elfloader-x86.c: unsupported relocation type GOT + A - P (%d)\n", type);
|
||||
break;
|
||||
default:
|
||||
printf("elfloader-x86.c: unknown type (%d)\n", type);
|
||||
break;
|
||||
}
|
||||
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
Loading…
Reference in a new issue