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 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <string.h> 28 #include "machdep.h" 29 #include "reloc.h" 30 #include "_librtld.h" 31 #include "_elf.h" 32 33 /* 34 * Undo relocations that have been applied to a memory image. Basically this 35 * involves copying the original files relocation offset into the new image 36 * being created. 37 */ 38 /* ARGSUSED3 */ 39 void 40 undo_reloc(void *vrel, uchar_t *oaddr, uchar_t *iaddr, Reloc *reloc) 41 { 42 Rela *rel = vrel; 43 const Rel_entry *rep; 44 Xword rtype = ELF_R_TYPE(rel->r_info, M_MACH); 45 ulong_t *_oaddr; 46 ulong_t *_iaddr; 47 48 switch (rtype) { 49 case R_SPARC_NONE: 50 break; 51 case R_SPARC_COPY: 52 (void) memset((void *)oaddr, 0, (size_t)reloc->r_size); 53 break; 54 case R_SPARC_JMP_SLOT: 55 /* LINTED */ 56 _oaddr = (unsigned long *)oaddr; 57 /* LINTED */ 58 _iaddr = (unsigned long *)iaddr; 59 60 if (_iaddr) { 61 *_oaddr++ = *_iaddr++; 62 *_oaddr++ = *_iaddr++; 63 *_oaddr = *_iaddr; 64 } else { 65 *_oaddr++ = 0; 66 *_oaddr++ = 0; 67 *_oaddr = 0; 68 } 69 break; 70 default: 71 rep = &reloc_table[rtype]; 72 if (iaddr) 73 (void) memcpy(oaddr, iaddr, rep->re_fsize); 74 else 75 (void) memset(oaddr, 0, rep->re_fsize); 76 } 77 } 78 79 /* 80 * Copy a relocation record and increment its value. The record must reflect 81 * the new address to which this image is fixed. 82 */ 83 /* ARGSUSED3 */ 84 void 85 inc_reloc(void *vnrel, void *vorel, Reloc *reloc, uchar_t *oaddr, 86 uchar_t *iaddr) 87 { 88 Rela *nrel = vnrel; 89 Rela *orel = vorel; 90 91 *nrel = *orel; 92 nrel->r_offset += reloc->r_value; 93 } 94 95 /* 96 * Clear a relocation record. The relocation has been applied to the image and 97 * thus the relocation must not occur again. 98 */ 99 void 100 clear_reloc(void *vrel) 101 { 102 Rela *rel = vrel; 103 104 rel->r_offset = 0; 105 rel->r_info = ELF_R_INFO(0, R_SPARC_NONE); 106 rel->r_addend = 0; 107 } 108 109 /* 110 * Apply a relocation to an image being built from an input file. Use the 111 * runtime linkers routines to do the necessary magic. 112 */ 113 void 114 apply_reloc(void *vrel, Reloc *reloc, const char *name, uchar_t *oaddr, 115 Rt_map *lmp) 116 { 117 Rela *rel = vrel; 118 Xword type = ELF_R_TYPE(rel->r_info, M_MACH); 119 Xword value = reloc->r_value + rel->r_addend; 120 121 if (type == R_SPARC_JMP_SLOT) { 122 uintptr_t addr, vaddr; 123 124 if (FLAGS(lmp) & FLG_RT_FIXED) 125 vaddr = 0; 126 else 127 vaddr = ADDR(lmp); 128 129 addr = (uintptr_t)oaddr - rel->r_offset; 130 /* LINTED */ 131 (void) elf_plt_write((uintptr_t)addr, vaddr, rel, 132 (uintptr_t)value, reloc->r_pltndx); 133 134 } else if (type == R_SPARC_COPY) { 135 (void) memcpy((void *)oaddr, (void *)value, 136 (size_t)reloc->r_size); 137 } else { 138 if (IS_EXTOFFSET(type)) 139 value += ELF_R_TYPE_DATA(rel->r_info); 140 (void) do_reloc_rtld(type, oaddr, &value, reloc->r_name, name, 141 LIST(lmp)); 142 } 143 } 144