elf32_machdep.c revision 48840
1/*- 2 * Copyright 1996-1998 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $Id: elf_machdep.c,v 1.4 1999/04/23 19:53:37 dt Exp $ 26 */ 27 28#include <sys/param.h> 29#include <sys/kernel.h> 30#include <sys/systm.h> 31#include <sys/malloc.h> 32#include <sys/proc.h> 33#include <sys/namei.h> 34#include <sys/fcntl.h> 35#include <sys/vnode.h> 36#include <sys/linker.h> 37#include <machine/elf.h> 38 39/* Process one elf relocation with addend. */ 40int 41elf_reloc(linker_file_t lf, const void *data, int type, const char *sym) 42{ 43 Elf_Addr relocbase = (Elf_Addr) lf->address; 44 Elf_Addr *where; 45 Elf_Addr addr; 46 Elf_Addr addend; 47 Elf_Word rtype; 48 const Elf_Rel *rel; 49 const Elf_Rela *rela; 50 51 switch (type) { 52 case ELF_RELOC_REL: 53 rel = (const Elf_Rel *)data; 54 where = (Elf_Addr *) (relocbase + rel->r_offset); 55 addend = *where; 56 rtype = ELF_R_TYPE(rel->r_info); 57 break; 58 case ELF_RELOC_RELA: 59 rela = (const Elf_Rela *)data; 60 where = (Elf_Addr *) (relocbase + rela->r_offset); 61 addend = rela->r_addend; 62 rtype = ELF_R_TYPE(rela->r_info); 63 break; 64 default: 65 panic("elf_reloc: unknown relocation mode %d\n", type); 66 } 67 68 switch (rtype) { 69 70 case R_ALPHA_NONE: 71 break; 72 73 case R_ALPHA_REFQUAD: 74 addr = (Elf_Addr) 75 linker_file_lookup_symbol(lf, sym, 1); 76 if (addr == NULL) 77 return -1; 78 addr += addend; 79 if (*where != addr) 80 *where = addr; 81 break; 82 83 case R_ALPHA_GLOB_DAT: 84 addr = (Elf_Addr) 85 linker_file_lookup_symbol(lf, sym, 1); 86 if (addr == NULL) 87 return -1; 88 if (*where != addr) 89 *where = addr; 90 break; 91 92 case R_ALPHA_JMP_SLOT: 93 /* No point in lazy binding for kernel modules. */ 94 addr = (Elf_Addr) 95 linker_file_lookup_symbol(lf, sym, 1); 96 if (addr == NULL) 97 return -1; 98 if (*where != addr) 99 *where = addr; 100 break; 101 102 case R_ALPHA_RELATIVE: 103 addr = relocbase + addend + *where; 104 if (*where != addr) 105 *where = addr; 106 break; 107 108 case R_ALPHA_COPY: 109 /* 110 * There shouldn't be copy relocations in kernel 111 * objects. 112 */ 113 printf("kldload: unexpected R_COPY relocation\n"); 114 return -1; 115 116 default: 117 printf("kldload: unexpected relocation type %d\n", 118 (int) rtype); 119 return -1; 120 } 121 return(0); 122} 123