Contiki 2.6
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00001 /* 00002 * Copyright (c) 2005, Swedish Institute of Computer Science 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the Institute nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 00018 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 * 00029 * This file is part of the Contiki operating system. 00030 * 00031 * @(#)$Id: elfloader-x86.c,v 1.3 2009/02/27 14:28:02 nvt-se Exp $ 00032 */ 00033 #include "elfloader-arch.h" 00034 #include <sys/mman.h> 00035 #include <fcntl.h> 00036 #include <stdio.h> 00037 00038 #define R_386_NONE 0 00039 #define R_386_32 1 00040 #define R_386_PC32 2 00041 #define R_386_GOT32 3 00042 #define R_386_PLT32 4 00043 #define R_386_COPY 5 00044 #define R_386_GLOB_DATA 6 00045 #define R_386_JMP_SLOT 7 00046 #define R_386_RELATIVE 8 00047 #define R_386_GOTOFF 9 00048 #define R_386_GOTPC 10 00049 00050 #define ELF32_R_TYPE(info) ((unsigned char)(info)) 00051 00052 static char datamemory[ELFLOADER_DATAMEMORY_SIZE]; 00053 00054 /*---------------------------------------------------------------------------*/ 00055 void * 00056 elfloader_arch_allocate_ram(int size) 00057 { 00058 return (void *)datamemory; 00059 } 00060 /*---------------------------------------------------------------------------*/ 00061 void * 00062 elfloader_arch_allocate_rom(int size) 00063 { 00064 int fd = open("/dev/zero", O_RDWR); 00065 char *mem = mmap(0, ELFLOADER_TEXTMEMORY_SIZE, PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0); 00066 return mem; 00067 } 00068 /*---------------------------------------------------------------------------*/ 00069 void 00070 elfloader_arch_write_rom(int fd, unsigned short textoff, unsigned int size, char *mem) 00071 { 00072 cfs_seek(fd, textoff, CFS_SEEK_SET); 00073 cfs_read(fd, (unsigned char *)mem, size); 00074 } 00075 /*---------------------------------------------------------------------------*/ 00076 void 00077 elfloader_arch_relocate(int fd, unsigned int sectionoffset, char *sectionaddress, 00078 struct elf32_rela *rela, char *addr) 00079 { 00080 unsigned int type; 00081 00082 /* 00083 Given value addr is S 00084 00085 S = runtime address of destination = addr 00086 A = rela->r_addend 00087 P = absolute address of relocation (section base address and rela->r_offset) 00088 */ 00089 00090 type = ELF32_R_TYPE(rela->r_info); 00091 00092 switch(type) { 00093 case R_386_NONE: 00094 case R_386_COPY: 00095 /* printf("elfloader-x86.c: relocation calculation completed (none) %d\n", type); */ 00096 break; 00097 case R_386_32: 00098 addr += rela->r_addend; /* +A */ 00099 00100 cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET); 00101 cfs_write(fd, (char *)&addr, 4); 00102 /*printf("elfloader-x86.c: performed relocation type S + A (%d)\n", type);*/ 00103 break; 00104 case R_386_PC32: 00105 addr -= (sectionaddress + rela->r_offset); /* -P */ 00106 addr += rela->r_addend; /* +A */ 00107 00108 cfs_seek(fd, sectionoffset + rela->r_offset, CFS_SEEK_SET); 00109 cfs_write(fd, (char *)&addr, 4); 00110 /*printf("elfloader-x86.c: performed relocation type S + A - P (%d)\n", type);*/ 00111 break; 00112 case R_386_GOT32: 00113 printf("elfloader-x86.c: unsupported relocation type G + A - P (%d)\n", type); 00114 break; 00115 case R_386_PLT32: 00116 printf("elfloader-x86.c: unsupported relocation type L + A - P (%d)\n", type); 00117 break; 00118 case R_386_GLOB_DATA: 00119 case R_386_JMP_SLOT: 00120 printf("elfloader-x86.c: unsupported relocation type S (%d)\n", type); 00121 break; 00122 case R_386_RELATIVE: 00123 printf("elfloader-x86.c: unsupported relocation type B + A (%d)\n", type); 00124 break; 00125 case R_386_GOTOFF: 00126 printf("elfloader-x86.c: unsupported relocation type S + A - GOT (%d)\n", type); 00127 break; 00128 case R_386_GOTPC: 00129 printf("elfloader-x86.c: unsupported relocation type GOT + A - P (%d)\n", type); 00130 break; 00131 default: 00132 printf("elfloader-x86.c: unknown type (%d)\n", type); 00133 break; 00134 } 00135 00136 } 00137 /*---------------------------------------------------------------------------*/