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
undo_reloc(void * vrel,uchar_t * oaddr,uchar_t * iaddr,Reloc * reloc)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
inc_reloc(void * vnrel,void * vorel,Reloc * reloc,uchar_t * oaddr,uchar_t * iaddr)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
clear_reloc(void * vrel)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
apply_reloc(void * vrel,Reloc * reloc,const char * name,uchar_t * oaddr,Rt_map * lmp)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