i386 removal, part 71/x: Remove legacy FreeBSD brand.
[dragonfly.git] / sys / cpu / x86_64 / misc / elf_machdep.c
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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: src/sys/i386/i386/elf_machdep.c,v 1.8 1999/12/21 11:14:02 eivind Exp $
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26 */
27
28#include <sys/param.h>
315b8b8b 29#include <sys/kernel.h>
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30#include <sys/systm.h>
31#include <sys/linker.h>
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32#include <sys/sysent.h>
33#include <sys/imgact_elf.h>
34#include <sys/syscall.h>
35#include <sys/signalvar.h>
36#include <sys/vnode.h>
d7f50089 37#include <machine/elf.h>
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38#include <machine/md_var.h>
39
40static struct sysentvec elf64_dragonfly_sysvec = {
41 .sv_size = SYS_MAXSYSCALL,
42 .sv_table = sysent,
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43 .sv_sigsize = 0,
44 .sv_sigtbl = NULL,
45 .sv_errsize = 0,
46 .sv_errtbl = NULL,
47 .sv_transtrap = NULL,
48 .sv_fixup = __elfN(dragonfly_fixup),
49 .sv_sendsig = sendsig,
50 .sv_sigcode = sigcode,
51 .sv_szsigcode = &szsigcode,
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52 .sv_name = "DragonFly ELF64",
53 .sv_coredump = __elfN(coredump),
54 .sv_imgact_try = NULL,
55 .sv_minsigstksz = MINSIGSTKSZ,
56};
57
58static Elf64_Brandinfo dragonfly_brand_info = {
59 .brand = ELFOSABI_NONE,
60 .machine = EM_X86_64,
61 .compat_3_brand = "DragonFly",
62 .emul_path = NULL,
16dbe6a9 63 .interp_path = "/libexec/ld-elf.so.2",
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64 .sysvec = &elf64_dragonfly_sysvec,
65 .interp_newpath = NULL,
66 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
67 .brand_note = &elf64_dragonfly_brandnote,
68};
69
70SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
71 (sysinit_cfunc_t) elf64_insert_brand_entry,
72 &dragonfly_brand_info);
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73
74/* Process one elf relocation with addend. */
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75static int
76elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
77 int type, int local, elf_lookup_fn lookup)
d7f50089 78{
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79 Elf64_Addr *where, val;
80 Elf32_Addr *where32, val32;
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81 Elf_Addr addr;
82 Elf_Addr addend;
1c0e3286 83 Elf_Size rtype, symidx;
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84 const Elf_Rel *rel;
85 const Elf_Rela *rela;
86
87 switch (type) {
88 case ELF_RELOC_REL:
89 rel = (const Elf_Rel *)data;
90 where = (Elf_Addr *) (relocbase + rel->r_offset);
d7f50089 91 rtype = ELF_R_TYPE(rel->r_info);
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92 symidx = ELF_R_SYM(rel->r_info);
93 /* Addend is 32 bit on 32 bit relocs */
94 switch (rtype) {
95 case R_X86_64_PC32:
96 case R_X86_64_32:
97 case R_X86_64_32S:
98 addend = *(Elf32_Addr *)where;
99 break;
100 default:
101 addend = *where;
102 break;
103 }
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104 break;
105 case ELF_RELOC_RELA:
106 rela = (const Elf_Rela *)data;
107 where = (Elf_Addr *) (relocbase + rela->r_offset);
108 addend = rela->r_addend;
109 rtype = ELF_R_TYPE(rela->r_info);
1c0e3286 110 symidx = ELF_R_SYM(rela->r_info);
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111 break;
112 default:
ed20d0e3 113 panic("unknown reloc type %d", type);
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114 }
115
116 switch (rtype) {
117
118 case R_X86_64_NONE: /* none */
119 break;
120
121 case R_X86_64_64: /* S + A */
1c0e3286 122 if (lookup(lf, symidx, 1, &addr))
d7f50089 123 return -1;
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124 val = addr + addend;
125 if (*where != val)
126 *where = val;
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127 break;
128
129 case R_X86_64_PC32: /* S + A - P */
1c0e3286 130 if (lookup(lf, symidx, 1, &addr))
d7f50089 131 return -1;
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132 where32 = (Elf32_Addr *)where;
133 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
134 if (*where32 != val32)
135 *where32 = val32;
136 break;
137
138 case R_X86_64_32: /* S + A zero extend */
139 case R_X86_64_32S: /* S + A sign extend */
140 if (lookup(lf, symidx, 1, &addr))
d7f50089 141 return -1;
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142 val32 = (Elf32_Addr)(addr + addend);
143 where32 = (Elf32_Addr *)where;
144 if (*where32 != val32)
145 *where32 = val32;
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146 break;
147
148 case R_X86_64_COPY: /* none */
149 /*
150 * There shouldn't be copy relocations in kernel
151 * objects.
152 */
153 kprintf("kldload: unexpected R_COPY relocation\n");
154 return -1;
155 break;
156
157 case R_X86_64_GLOB_DAT: /* S */
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158 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
159 if (lookup(lf, symidx, 1, &addr))
d7f50089 160 return -1;
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161 if (*where != addr)
162 *where = addr;
163 break;
164
165 case R_X86_64_RELATIVE: /* B + A */
166 addr = relocbase + addend;
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167 val = addr;
168 if (*where != val)
169 *where = val;
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170 break;
171
172 default:
1c0e3286 173 kprintf("kldload: unexpected relocation type %ld\n",
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174 rtype);
175 return -1;
176 }
177 return(0);
178}
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179
180int
181elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
182 elf_lookup_fn lookup)
183{
184
185 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
186}
187
188int
189elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
190 int type, elf_lookup_fn lookup)
191{
192
193 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
194}