contiki/core/loader/elfloader-x86.c

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/*
* 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.
*
*/
#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_rom(int fd, unsigned short textoff, unsigned int size, char *mem)
{
cfs_seek(fd, textoff, CFS_SEEK_SET);
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_SEEK_SET);
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_SEEK_SET);
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;
}
}
/*---------------------------------------------------------------------------*/