| 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> |
| 29 | #include <sys/kernel.h> |
| 30 | #include <sys/systm.h> |
| 31 | #include <sys/linker.h> |
| 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> |
| 37 | #include <machine/elf.h> |
| 38 | #include <machine/md_var.h> |
| 39 | |
| 40 | static struct sysentvec elf64_dragonfly_sysvec = { |
| 41 | .sv_size = SYS_MAXSYSCALL, |
| 42 | .sv_table = sysent, |
| 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, |
| 52 | .sv_name = "DragonFly ELF64", |
| 53 | .sv_coredump = __elfN(coredump), |
| 54 | .sv_imgact_try = NULL, |
| 55 | .sv_minsigstksz = MINSIGSTKSZ, |
| 56 | }; |
| 57 | |
| 58 | static Elf64_Brandinfo dragonfly_brand_info = { |
| 59 | .brand = ELFOSABI_NONE, |
| 60 | .machine = EM_X86_64, |
| 61 | .compat_3_brand = "DragonFly", |
| 62 | .emul_path = NULL, |
| 63 | .interp_path = "/libexec/ld-elf.so.2", |
| 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 | |
| 70 | SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, |
| 71 | (sysinit_cfunc_t) elf64_insert_brand_entry, |
| 72 | &dragonfly_brand_info); |
| 73 | |
| 74 | /* Process one elf relocation with addend. */ |
| 75 | static int |
| 76 | elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, |
| 77 | int type, int local, elf_lookup_fn lookup) |
| 78 | { |
| 79 | Elf64_Addr *where, val; |
| 80 | Elf32_Addr *where32, val32; |
| 81 | Elf_Addr addr; |
| 82 | Elf_Addr addend; |
| 83 | Elf_Size rtype, symidx; |
| 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); |
| 91 | rtype = ELF_R_TYPE(rel->r_info); |
| 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 | } |
| 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); |
| 110 | symidx = ELF_R_SYM(rela->r_info); |
| 111 | break; |
| 112 | default: |
| 113 | panic("unknown reloc type %d", type); |
| 114 | } |
| 115 | |
| 116 | switch (rtype) { |
| 117 | |
| 118 | case R_X86_64_NONE: /* none */ |
| 119 | break; |
| 120 | |
| 121 | case R_X86_64_64: /* S + A */ |
| 122 | if (lookup(lf, symidx, 1, &addr)) |
| 123 | return -1; |
| 124 | val = addr + addend; |
| 125 | if (*where != val) |
| 126 | *where = val; |
| 127 | break; |
| 128 | |
| 129 | case R_X86_64_PC32: /* S + A - P */ |
| 130 | if (lookup(lf, symidx, 1, &addr)) |
| 131 | return -1; |
| 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)) |
| 141 | return -1; |
| 142 | val32 = (Elf32_Addr)(addr + addend); |
| 143 | where32 = (Elf32_Addr *)where; |
| 144 | if (*where32 != val32) |
| 145 | *where32 = val32; |
| 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 */ |
| 158 | case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ |
| 159 | if (lookup(lf, symidx, 1, &addr)) |
| 160 | return -1; |
| 161 | if (*where != addr) |
| 162 | *where = addr; |
| 163 | break; |
| 164 | |
| 165 | case R_X86_64_RELATIVE: /* B + A */ |
| 166 | addr = relocbase + addend; |
| 167 | val = addr; |
| 168 | if (*where != val) |
| 169 | *where = val; |
| 170 | break; |
| 171 | |
| 172 | default: |
| 173 | kprintf("kldload: unexpected relocation type %ld\n", |
| 174 | rtype); |
| 175 | return -1; |
| 176 | } |
| 177 | return(0); |
| 178 | } |
| 179 | |
| 180 | int |
| 181 | elf_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 | |
| 188 | int |
| 189 | elf_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 | } |