elf64_machdep.c revision 95410
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 * $FreeBSD: head/sys/powerpc/powerpc/elf_machdep.c 95410 2002-04-25 01:22:16Z marcel $ 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) 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, symidx; 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 symidx = ELF_R_SYM(rel->r_info); 58 break; 59 case ELF_RELOC_RELA: 60 rela = (const Elf_Rela *)data; 61 where = (Elf_Addr *) (relocbase + rela->r_offset); 62 addend = rela->r_addend; 63 rtype = ELF_R_TYPE(rela->r_info); 64 symidx = ELF_R_SYM(rela->r_info); 65 break; 66 default: 67 panic("elf_reloc: unknown relocation mode %d\n", type); 68 } 69 70 switch (rtype) { 71 72 case R_PPC_NONE: 73 break; 74 75 case R_PPC_GLOB_DAT: 76 addr = elf_lookup(lf, symidx, 1); 77 if (addr == 0) 78 return -1; 79 addr += addend; 80 if (*where != addr) 81 *where = addr; 82 break; 83 84 case R_PPC_JMP_SLOT: 85 /* No point in lazy binding for kernel modules. */ 86 addr = elf_lookup(lf, symidx, 1); 87 if (addr == 0) 88 return -1; 89 if (*where != addr) 90 *where = addr; 91 break; 92 93 case R_PPC_RELATIVE: 94 addr = relocbase + addend + *where; 95 if (*where != addr) 96 *where = addr; 97 break; 98 99 case R_PPC_COPY: 100 /* 101 * There shouldn't be copy relocations in kernel 102 * objects. 103 */ 104 printf("kldload: unexpected R_COPY relocation\n"); 105 return -1; 106 107 default: 108 printf("kldload: unexpected relocation type %d\n", 109 (int) rtype); 110 return -1; 111 } 112 return(0); 113} 114