138 lines
4.8 KiB
C
138 lines
4.8 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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-x86.c,v 1.2 2006/12/18 14:54:04 fros4943 Exp $
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*/
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#include "elfloader-arch.h"
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <stdio.h>
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#define R_386_NONE 0
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#define R_386_32 1
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#define R_386_PC32 2
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#define R_386_GOT32 3
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#define R_386_PLT32 4
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#define R_386_COPY 5
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#define R_386_GLOB_DATA 6
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#define R_386_JMP_SLOT 7
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#define R_386_RELATIVE 8
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#define R_386_GOTOFF 9
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#define R_386_GOTPC 10
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#define ELF32_R_TYPE(info) ((unsigned char)(info))
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static char datamemory[ELFLOADER_DATAMEMORY_SIZE];
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/*---------------------------------------------------------------------------*/
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void *
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elfloader_arch_allocate_ram(int size)
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{
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return (void *)datamemory;
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}
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/*---------------------------------------------------------------------------*/
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void *
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elfloader_arch_allocate_rom(int size)
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{
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int fd = open("/dev/zero", O_RDWR);
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char *mem = mmap(0, ELFLOADER_TEXTMEMORY_SIZE, PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
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return mem;
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}
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/*---------------------------------------------------------------------------*/
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void
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elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem)
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{
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cfs_seek(fd, textoff);
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cfs_read(fd, (unsigned char *)mem, size);
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}
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/*---------------------------------------------------------------------------*/
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void
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elfloader_arch_relocate(int fd, unsigned int sectionoffset, char *sectionaddress,
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struct elf32_rela *rela, char *addr)
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{
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unsigned int type;
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/*
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Given value addr is S
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S = runtime address of destination = addr
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A = rela->r_addend
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P = absolute address of relocation (section base address and rela->r_offset)
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*/
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type = ELF32_R_TYPE(rela->r_info);
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switch(type) {
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case R_386_NONE:
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case R_386_COPY:
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/* printf("elfloader-x86.c: relocation calculation completed (none) %d\n", type); */
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break;
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case R_386_32:
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addr += rela->r_addend; /* +A */
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cfs_seek(fd, sectionoffset + rela->r_offset);
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cfs_write(fd, (char *)&addr, 4);
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/*printf("elfloader-x86.c: performed relocation type S + A (%d)\n", type);*/
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break;
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case R_386_PC32:
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addr -= (sectionaddress + rela->r_offset); /* -P */
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addr += rela->r_addend; /* +A */
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cfs_seek(fd, sectionoffset + rela->r_offset);
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cfs_write(fd, (char *)&addr, 4);
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/*printf("elfloader-x86.c: performed relocation type S + A - P (%d)\n", type);*/
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break;
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case R_386_GOT32:
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printf("elfloader-x86.c: unsupported relocation type G + A - P (%d)\n", type);
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break;
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case R_386_PLT32:
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printf("elfloader-x86.c: unsupported relocation type L + A - P (%d)\n", type);
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break;
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case R_386_GLOB_DATA:
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case R_386_JMP_SLOT:
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printf("elfloader-x86.c: unsupported relocation type S (%d)\n", type);
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break;
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case R_386_RELATIVE:
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printf("elfloader-x86.c: unsupported relocation type B + A (%d)\n", type);
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break;
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case R_386_GOTOFF:
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printf("elfloader-x86.c: unsupported relocation type S + A - GOT (%d)\n", type);
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break;
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case R_386_GOTPC:
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printf("elfloader-x86.c: unsupported relocation type GOT + A - P (%d)\n", type);
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break;
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default:
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printf("elfloader-x86.c: unknown type (%d)\n", type);
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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