Dynamic root: Move ld-elf.so.2 to /libexec
[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,
43 .sv_mask = -1,
44 .sv_sigsize = 0,
45 .sv_sigtbl = NULL,
46 .sv_errsize = 0,
47 .sv_errtbl = NULL,
48 .sv_transtrap = NULL,
49 .sv_fixup = __elfN(dragonfly_fixup),
50 .sv_sendsig = sendsig,
51 .sv_sigcode = sigcode,
52 .sv_szsigcode = &szsigcode,
53 .sv_prepsyscall = NULL,
54 .sv_name = "DragonFly ELF64",
55 .sv_coredump = __elfN(coredump),
56 .sv_imgact_try = NULL,
57 .sv_minsigstksz = MINSIGSTKSZ,
58};
59
60static Elf64_Brandinfo dragonfly_brand_info = {
61 .brand = ELFOSABI_NONE,
62 .machine = EM_X86_64,
63 .compat_3_brand = "DragonFly",
64 .emul_path = NULL,
16dbe6a9 65 .interp_path = "/libexec/ld-elf.so.2",
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66 .sysvec = &elf64_dragonfly_sysvec,
67 .interp_newpath = NULL,
68 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
69 .brand_note = &elf64_dragonfly_brandnote,
70};
71
72SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
73 (sysinit_cfunc_t) elf64_insert_brand_entry,
74 &dragonfly_brand_info);
d7f50089 75
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76static Elf64_Brandinfo freebsd_brand_info = {
77 .brand = ELFOSABI_FREEBSD,
78 .machine = EM_X86_64,
79 .compat_3_brand = "FreeBSD",
80 .emul_path = NULL,
81 .interp_path = "/usr/libexec/ld-elf.so.1",
82 .sysvec = &elf64_dragonfly_sysvec,
83 .interp_newpath = NULL,
84 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
85 .brand_note = &elf64_freebsd_brandnote,
86};
87
88SYSINIT(elf64_fbsd, SI_SUB_EXEC, SI_ORDER_ANY,
89 (sysinit_cfunc_t) elf64_insert_brand_entry,
90 &freebsd_brand_info);
91
d7f50089 92/* Process one elf relocation with addend. */
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93static int
94elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
95 int type, int local, elf_lookup_fn lookup)
d7f50089 96{
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97 Elf64_Addr *where, val;
98 Elf32_Addr *where32, val32;
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99 Elf_Addr addr;
100 Elf_Addr addend;
1c0e3286 101 Elf_Size rtype, symidx;
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102 const Elf_Rel *rel;
103 const Elf_Rela *rela;
104
105 switch (type) {
106 case ELF_RELOC_REL:
107 rel = (const Elf_Rel *)data;
108 where = (Elf_Addr *) (relocbase + rel->r_offset);
d7f50089 109 rtype = ELF_R_TYPE(rel->r_info);
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110 symidx = ELF_R_SYM(rel->r_info);
111 /* Addend is 32 bit on 32 bit relocs */
112 switch (rtype) {
113 case R_X86_64_PC32:
114 case R_X86_64_32:
115 case R_X86_64_32S:
116 addend = *(Elf32_Addr *)where;
117 break;
118 default:
119 addend = *where;
120 break;
121 }
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122 break;
123 case ELF_RELOC_RELA:
124 rela = (const Elf_Rela *)data;
125 where = (Elf_Addr *) (relocbase + rela->r_offset);
126 addend = rela->r_addend;
127 rtype = ELF_R_TYPE(rela->r_info);
1c0e3286 128 symidx = ELF_R_SYM(rela->r_info);
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129 break;
130 default:
ed20d0e3 131 panic("unknown reloc type %d", type);
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132 }
133
134 switch (rtype) {
135
136 case R_X86_64_NONE: /* none */
137 break;
138
139 case R_X86_64_64: /* S + A */
1c0e3286 140 if (lookup(lf, symidx, 1, &addr))
d7f50089 141 return -1;
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142 val = addr + addend;
143 if (*where != val)
144 *where = val;
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145 break;
146
147 case R_X86_64_PC32: /* S + A - P */
1c0e3286 148 if (lookup(lf, symidx, 1, &addr))
d7f50089 149 return -1;
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150 where32 = (Elf32_Addr *)where;
151 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
152 if (*where32 != val32)
153 *where32 = val32;
154 break;
155
156 case R_X86_64_32: /* S + A zero extend */
157 case R_X86_64_32S: /* S + A sign extend */
158 if (lookup(lf, symidx, 1, &addr))
d7f50089 159 return -1;
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160 val32 = (Elf32_Addr)(addr + addend);
161 where32 = (Elf32_Addr *)where;
162 if (*where32 != val32)
163 *where32 = val32;
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164 break;
165
166 case R_X86_64_COPY: /* none */
167 /*
168 * There shouldn't be copy relocations in kernel
169 * objects.
170 */
171 kprintf("kldload: unexpected R_COPY relocation\n");
172 return -1;
173 break;
174
175 case R_X86_64_GLOB_DAT: /* S */
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176 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
177 if (lookup(lf, symidx, 1, &addr))
d7f50089 178 return -1;
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179 if (*where != addr)
180 *where = addr;
181 break;
182
183 case R_X86_64_RELATIVE: /* B + A */
184 addr = relocbase + addend;
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185 val = addr;
186 if (*where != val)
187 *where = val;
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188 break;
189
190 default:
1c0e3286 191 kprintf("kldload: unexpected relocation type %ld\n",
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192 rtype);
193 return -1;
194 }
195 return(0);
196}
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197
198int
199elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
200 elf_lookup_fn lookup)
201{
202
203 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
204}
205
206int
207elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
208 int type, elf_lookup_fn lookup)
209{
210
211 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
212}