Dynamic root: Move ld-elf.so.2 to /libexec
[dragonfly.git] / sys / cpu / i386 / 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 $
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>
984263bc 37#include <machine/elf.h>
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38#include <machine/md_var.h>
39
40static struct sysentvec elf32_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 ELF32",
55 .sv_coredump = __elfN(coredump),
56 .sv_imgact_try = NULL,
57 .sv_minsigstksz = MINSIGSTKSZ,
58};
59
60static Elf32_Brandinfo dragonfly_brand_info = {
61 .brand = ELFOSABI_NONE,
62 .machine = EM_386,
63 .compat_3_brand = "DragonFly",
64 .emul_path = NULL,
16dbe6a9 65 .interp_path = "/libexec/ld-elf.so.2",
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66 .sysvec = &elf32_dragonfly_sysvec,
67 .interp_newpath = NULL,
68 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
69 .brand_note = &elf32_dragonfly_brandnote,
70};
71
72SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
73 (sysinit_cfunc_t) elf32_insert_brand_entry,
74 &dragonfly_brand_info);
984263bc 75
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76static Elf32_Brandinfo freebsd_brand_info = {
77 .brand = ELFOSABI_FREEBSD,
78 .machine = EM_386,
79 .compat_3_brand = "FreeBSD",
80 .emul_path = NULL,
81 .interp_path = "/usr/libexec/ld-elf.so.1",
82 .sysvec = &elf32_dragonfly_sysvec,
83 .interp_newpath = NULL,
84 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
85 .brand_note = &elf32_freebsd_brandnote,
86};
87
88SYSINIT(elf32_fbsd, SI_SUB_EXEC, SI_ORDER_ANY,
89 (sysinit_cfunc_t) elf32_insert_brand_entry,
90 &freebsd_brand_info);
91
984263bc 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)
984263bc 96{
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97 Elf_Addr *where;
98 Elf_Addr addr;
99 Elf_Addr addend;
1c0e3286 100 Elf_Word rtype, symidx;
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101 const Elf_Rel *rel;
102 const Elf_Rela *rela;
103
104 switch (type) {
105 case ELF_RELOC_REL:
106 rel = (const Elf_Rel *)data;
107 where = (Elf_Addr *) (relocbase + rel->r_offset);
108 addend = *where;
109 rtype = ELF_R_TYPE(rel->r_info);
1c0e3286 110 symidx = ELF_R_SYM(rel->r_info);
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111 break;
112 case ELF_RELOC_RELA:
113 rela = (const Elf_Rela *)data;
114 where = (Elf_Addr *) (relocbase + rela->r_offset);
115 addend = rela->r_addend;
116 rtype = ELF_R_TYPE(rela->r_info);
1c0e3286 117 symidx = ELF_R_SYM(rela->r_info);
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118 break;
119 default:
ed20d0e3 120 panic("unknown reloc type %d", type);
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121 }
122
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123 if (local) {
124 if (rtype == R_386_RELATIVE) { /* A + B */
125 addr = elf_relocaddr(lf, relocbase + addend);
126 if (*where != addr)
127 *where = addr;
128 }
129 return (0);
130 }
131
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132 switch (rtype) {
133
134 case R_386_NONE: /* none */
135 break;
136
137 case R_386_32: /* S + A */
1c0e3286 138 if (lookup(lf, symidx, 1, &addr))
984263bc 139 return -1;
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140 addr += addend;
141 if (*where != addr)
142 *where = addr;
143 break;
144
145 case R_386_PC32: /* S + A - P */
1c0e3286 146 if (lookup(lf, symidx, 1, &addr))
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147 return -1;
148 addr += addend - (Elf_Addr)where;
149 if (*where != addr)
150 *where = addr;
151 break;
152
153 case R_386_COPY: /* none */
154 /*
155 * There shouldn't be copy relocations in kernel
156 * objects.
157 */
26be20a0 158 kprintf("kldload: unexpected R_COPY relocation\n");
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159 return -1;
160 break;
161
162 case R_386_GLOB_DAT: /* S */
1c0e3286 163 if (lookup(lf, symidx, 1, &addr))
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164 return -1;
165 if (*where != addr)
166 *where = addr;
167 break;
168
1c0e3286 169 case R_386_RELATIVE:
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170 break;
171
172 default:
26be20a0 173 kprintf("kldload: unexpected relocation type %d\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}