1 /* i386 specific symbolic name handling.
2 Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
3 Written by Ulrich Drepper <drepper@redhat.com>, 2000.
4
5 This program is Open Source software; you can redistribute it and/or
6 modify it under the terms of the Open Software License version 1.0 as
7 published by the Open Source Initiative.
8
9 You should have received a copy of the Open Software License along
10 with this program; if not, you may obtain a copy of the Open Software
11 License version 1.0 from http://www.opensource.org/licenses/osl.php or
12 by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
13 3001 King Ranch Road, Ukiah, CA 95482. */
14
15 #ifdef HAVE_CONFIG_H
16 # include <config.h>
17 #endif
18
19 #include <assert.h>
20 #include <elf.h>
21 #include <stddef.h>
22
23 #include <libebl_i386.h>
24
25
26 /* Return of the backend. */
27 const char *
i386_backend_name(void)28 i386_backend_name (void)
29 {
30 return "i386";
31 }
32
33
34 /* Relocation mapping table. */
35 static struct
36 {
37 const char *name;
38 enum { both = 0, rel = 1, exec = 2 } appear;
39 } reloc_map_table[] =
40 {
41 [R_386_NONE] = { "R_386_NONE", both },
42 [R_386_32] = { "R_386_32", both },
43 [R_386_PC32] = { "R_386_PC32", rel },
44 [R_386_GOT32] = { "R_386_GOT32", rel },
45 [R_386_PLT32] = { "R_386_PLT32", rel },
46 [R_386_COPY] = { "R_386_COPY", exec },
47 [R_386_GLOB_DAT] = { "R_386_GLOB_DAT", exec },
48 [R_386_JMP_SLOT] = { "R_386_JMP_SLOT", exec },
49 [R_386_RELATIVE] = { "R_386_RELATIVE", exec },
50 [R_386_GOTOFF] = { "R_386_GOTOFF", rel },
51 [R_386_GOTPC] = { "R_386_GOTPC", rel },
52 [R_386_32PLT] = { "R_386_32PLT", rel },
53 [R_386_TLS_TPOFF] = { "R_386_TLS_TPOFF", rel },
54 [R_386_TLS_IE] = { "R_386_TLS_IE", rel },
55 [R_386_TLS_GOTIE] = { "R_386_TLS_GOTIE", rel },
56 [R_386_TLS_LE] = { "R_386_TLS_LE", rel },
57 [R_386_TLS_GD] = { "R_386_TLS_GD", rel },
58 [R_386_TLS_LDM] = { "R_386_TLS_LDM", rel },
59 [R_386_16] = { "R_386_16", rel },
60 [R_386_PC16] = { "R_386_PC16", rel },
61 [R_386_8] = { "R_386_8", rel },
62 [R_386_PC8] = { "R_386_PC8", rel },
63 [R_386_TLS_GD_32] = { "R_386_TLS_GD_32", rel },
64 [R_386_TLS_GD_PUSH] = { "R_386_TLS_GD_PUSH", rel },
65 [R_386_TLS_GD_CALL] = { "R_386_TLS_GD_CALL", rel },
66 [R_386_TLS_GD_POP] = { "R_386_TLS_GD_POP", rel },
67 [R_386_TLS_LDM_32] = { "R_386_TLS_LDM_32", rel },
68 [R_386_TLS_LDM_PUSH] = { "R_386_TLS_LDM_PUSH", rel },
69 [R_386_TLS_LDM_CALL] = { "R_386_TLS_LDM_CALL", rel },
70 [R_386_TLS_LDM_POP] = { "R_386_TLS_LDM_POP", rel },
71 [R_386_TLS_LDO_32] = { "R_386_TLS_LDO_32", rel },
72 [R_386_TLS_IE_32] = { "R_386_TLS_IE_32", rel },
73 [R_386_TLS_LE_32] = { "R_386_TLS_LE_32", rel },
74 [R_386_TLS_DTPMOD32] = { "R_386_TLS_DTPMOD32", rel },
75 [R_386_TLS_DTPOFF32] = { "R_386_TLS_DTPOFF32", rel },
76 [R_386_TLS_TPOFF32] = { "R_386_TLS_TPOFF32", rel }
77 };
78
79
80 /* Determine relocation type string for x86. */
81 const char *
i386_reloc_type_name(int type,char * buf,size_t len)82 i386_reloc_type_name (int type, char *buf, size_t len)
83 {
84 if (type < 0 || type >= R_386_NUM)
85 return NULL;
86
87 return reloc_map_table[type].name;
88 }
89
90
91 /* Check for correct relocation type. */
92 bool
i386_reloc_type_check(int type)93 i386_reloc_type_check (int type)
94 {
95 return (type >= R_386_NONE && type < R_386_NUM
96 && reloc_map_table[type].name != NULL) ? true : false;
97 }
98
99
100 /* Check for correct relocation type use. */
101 bool
i386_reloc_valid_use(Elf * elf,int type)102 i386_reloc_valid_use (Elf *elf, int type)
103 {
104 if (type < R_386_NONE || type >= R_386_NUM
105 || reloc_map_table[type].name == NULL)
106 return false;
107
108 Elf32_Ehdr *ehdr = elf32_getehdr (elf);
109 assert (ehdr != NULL);
110
111 if (reloc_map_table[type].appear == rel)
112 return ehdr->e_type == ET_REL;
113
114 if (reloc_map_table[type].appear == exec)
115 return ehdr->e_type != ET_REL;
116
117 assert (reloc_map_table[type].appear == both);
118 return true;
119 }
120
121
122 /* Return true if the symbol type is that referencing the GOT. */
123 bool
i386_gotpc_reloc_check(Elf * elf,int type)124 i386_gotpc_reloc_check (Elf *elf, int type)
125 {
126 return type == R_386_GOTPC;
127 }
128