1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <string.h> 29 #include "machdep.h" 30 #include "reloc.h" 31 #include "_librtld.h" 32 #include "_elf.h" 33 34 /* 35 * Undo relocations that have been applied to a memory image. Basically this 36 * involves copying the original files relocation offset into the new image 37 * being created. 38 */ 39 /* ARGSUSED3 */ 40 void 41 undo_reloc(void *vrel, uchar_t *oaddr, uchar_t *iaddr, Reloc *reloc) 42 { 43 Rela *rel = vrel; 44 const Rel_entry *rep; 45 Xword rtype = ELF_R_TYPE(rel->r_info, M_MACH); 46 ulong_t *_oaddr; 47 ulong_t *_iaddr; 48 49 switch (rtype) { 50 case R_SPARC_NONE: 51 break; 52 case R_SPARC_COPY: 53 (void) memset((void *)oaddr, 0, (size_t)reloc->r_size); 54 break; 55 case R_SPARC_JMP_SLOT: 56 /* LINTED */ 57 _oaddr = (unsigned long *)oaddr; 58 /* LINTED */ 59 _iaddr = (unsigned long *)iaddr; 60 61 if (_iaddr) { 62 *_oaddr++ = *_iaddr++; 63 *_oaddr++ = *_iaddr++; 64 *_oaddr = *_iaddr; 65 } else { 66 *_oaddr++ = 0; 67 *_oaddr++ = 0; 68 *_oaddr = 0; 69 } 70 break; 71 default: 72 rep = &reloc_table[rtype]; 73 if (iaddr) 74 (void) memcpy(oaddr, iaddr, rep->re_fsize); 75 else 76 (void) memset(oaddr, 0, rep->re_fsize); 77 } 78 } 79 80 /* 81 * Copy a relocation record and increment its value. The record must reflect 82 * the new address to which this image is fixed. 83 */ 84 /* ARGSUSED3 */ 85 void 86 inc_reloc(void *vnrel, void *vorel, Reloc *reloc, uchar_t *oaddr, 87 uchar_t *iaddr) 88 { 89 Rela *nrel = vnrel; 90 Rela *orel = vorel; 91 92 *nrel = *orel; 93 nrel->r_offset += reloc->r_value; 94 } 95 96 /* 97 * Clear a relocation record. The relocation has been applied to the image and 98 * thus the relocation must not occur again. 99 */ 100 void 101 clear_reloc(void *vrel) 102 { 103 Rela *rel = vrel; 104 105 rel->r_offset = 0; 106 rel->r_info = ELF_R_INFO(0, R_SPARC_NONE); 107 rel->r_addend = 0; 108 } 109 110 /* 111 * Apply a relocation to an image being built from an input file. Use the 112 * runtime linkers routines to do the necessary magic. 113 */ 114 void 115 apply_reloc(void *vrel, Reloc *reloc, const char *name, uchar_t *oaddr, 116 Rt_map *lmp) 117 { 118 Rela *rel = vrel; 119 Xword type = ELF_R_TYPE(rel->r_info, M_MACH); 120 Xword value = reloc->r_value + rel->r_addend; 121 122 if (type == R_SPARC_JMP_SLOT) { 123 uintptr_t addr, vaddr; 124 125 if (FLAGS(lmp) & FLG_RT_FIXED) 126 vaddr = 0; 127 else 128 vaddr = ADDR(lmp); 129 130 addr = (uintptr_t)oaddr - rel->r_offset; 131 /* LINTED */ 132 elf_plt_write((uintptr_t)addr, vaddr, rel, 133 (uintptr_t)value, reloc->r_pltndx); 134 135 } else if (type == R_SPARC_COPY) { 136 (void) memcpy((void *)oaddr, (void *)value, 137 (size_t)reloc->r_size); 138 } else { 139 if (IS_EXTOFFSET(type)) 140 value += ELF_R_TYPE_DATA(rel->r_info); 141 (void) do_reloc_rtld(type, oaddr, &value, reloc->r_name, name, 142 LIST(lmp)); 143 } 144 } 145