Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/elf_machdep.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
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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 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD: releng/8.2/sys/amd64/amd64/elf_machdep.c 214755 2010-11-03 21:21:12Z kib $"); 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 #include <sys/exec.h> 33 #include <sys/imgact.h> 34 #include <sys/linker.h> 35 #include <sys/proc.h> 36 #include <sys/sysent.h> 37 #include <sys/imgact_elf.h> 38 #include <sys/syscall.h> 39 #include <sys/sysent.h> 40 #include <sys/signalvar.h> 41 #include <sys/vnode.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 #include <vm/vm_param.h> 46 47 #include <machine/elf.h> 48 #include <machine/md_var.h> 49 50 struct sysentvec elf64_freebsd_sysvec = { 51 .sv_size = SYS_MAXSYSCALL, 52 .sv_table = sysent, 53 .sv_mask = 0, 54 .sv_sigsize = 0, 55 .sv_sigtbl = NULL, 56 .sv_errsize = 0, 57 .sv_errtbl = NULL, 58 .sv_transtrap = NULL, 59 .sv_fixup = __elfN(freebsd_fixup), 60 .sv_sendsig = sendsig, 61 .sv_sigcode = sigcode, 62 .sv_szsigcode = &szsigcode, 63 .sv_prepsyscall = NULL, 64 .sv_name = "FreeBSD ELF64", 65 .sv_coredump = __elfN(coredump), 66 .sv_imgact_try = NULL, 67 .sv_minsigstksz = MINSIGSTKSZ, 68 .sv_pagesize = PAGE_SIZE, 69 .sv_minuser = VM_MIN_ADDRESS, 70 .sv_maxuser = VM_MAXUSER_ADDRESS, 71 .sv_usrstack = USRSTACK, 72 .sv_psstrings = PS_STRINGS, 73 .sv_stackprot = VM_PROT_ALL, 74 .sv_copyout_strings = exec_copyout_strings, 75 .sv_setregs = exec_setregs, 76 .sv_fixlimit = NULL, 77 .sv_maxssiz = NULL, 78 .sv_flags = SV_ABI_FREEBSD | SV_LP64, 79 .sv_set_syscall_retval = cpu_set_syscall_retval, 80 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 81 .sv_syscallnames = syscallnames, 82 }; 83 84 static Elf64_Brandinfo freebsd_brand_info = { 85 .brand = ELFOSABI_FREEBSD, 86 .machine = EM_X86_64, 87 .compat_3_brand = "FreeBSD", 88 .emul_path = NULL, 89 .interp_path = "/libexec/ld-elf.so.1", 90 .sysvec = &elf64_freebsd_sysvec, 91 .interp_newpath = NULL, 92 .brand_note = &elf64_freebsd_brandnote, 93 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 94 }; 95 96 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 97 (sysinit_cfunc_t) elf64_insert_brand_entry, 98 &freebsd_brand_info); 99 100 static Elf64_Brandinfo freebsd_brand_oinfo = { 101 .brand = ELFOSABI_FREEBSD, 102 .machine = EM_X86_64, 103 .compat_3_brand = "FreeBSD", 104 .emul_path = NULL, 105 .interp_path = "/usr/libexec/ld-elf.so.1", 106 .sysvec = &elf64_freebsd_sysvec, 107 .interp_newpath = NULL, 108 .brand_note = &elf64_freebsd_brandnote, 109 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 110 }; 111 112 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 113 (sysinit_cfunc_t) elf64_insert_brand_entry, 114 &freebsd_brand_oinfo); 115 116 static Elf64_Brandinfo kfreebsd_brand_info = { 117 .brand = ELFOSABI_FREEBSD, 118 .machine = EM_X86_64, 119 .compat_3_brand = "FreeBSD", 120 .emul_path = NULL, 121 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 122 .sysvec = &elf64_freebsd_sysvec, 123 .interp_newpath = NULL, 124 .brand_note = &elf64_kfreebsd_brandnote, 125 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 126 }; 127 128 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 129 (sysinit_cfunc_t) elf64_insert_brand_entry, 130 &kfreebsd_brand_info); 131 132 133 void 134 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 135 size_t *off __unused) 136 { 137 } 138 139 140 /* Process one elf relocation with addend. */ 141 static int 142 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 143 int type, int local, elf_lookup_fn lookup) 144 { 145 Elf64_Addr *where, val; 146 Elf32_Addr *where32, val32; 147 Elf_Addr addr; 148 Elf_Addr addend; 149 Elf_Size rtype, symidx; 150 const Elf_Rel *rel; 151 const Elf_Rela *rela; 152 153 switch (type) { 154 case ELF_RELOC_REL: 155 rel = (const Elf_Rel *)data; 156 where = (Elf_Addr *) (relocbase + rel->r_offset); 157 rtype = ELF_R_TYPE(rel->r_info); 158 symidx = ELF_R_SYM(rel->r_info); 159 /* Addend is 32 bit on 32 bit relocs */ 160 switch (rtype) { 161 case R_X86_64_PC32: 162 case R_X86_64_32S: 163 addend = *(Elf32_Addr *)where; 164 break; 165 default: 166 addend = *where; 167 break; 168 } 169 break; 170 case ELF_RELOC_RELA: 171 rela = (const Elf_Rela *)data; 172 where = (Elf_Addr *) (relocbase + rela->r_offset); 173 addend = rela->r_addend; 174 rtype = ELF_R_TYPE(rela->r_info); 175 symidx = ELF_R_SYM(rela->r_info); 176 break; 177 default: 178 panic("unknown reloc type %d\n", type); 179 } 180 181 switch (rtype) { 182 183 case R_X86_64_NONE: /* none */ 184 break; 185 186 case R_X86_64_64: /* S + A */ 187 addr = lookup(lf, symidx, 1); 188 val = addr + addend; 189 if (addr == 0) 190 return -1; 191 if (*where != val) 192 *where = val; 193 break; 194 195 case R_X86_64_PC32: /* S + A - P */ 196 addr = lookup(lf, symidx, 1); 197 where32 = (Elf32_Addr *)where; 198 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 199 if (addr == 0) 200 return -1; 201 if (*where32 != val32) 202 *where32 = val32; 203 break; 204 205 case R_X86_64_32S: /* S + A sign extend */ 206 addr = lookup(lf, symidx, 1); 207 val32 = (Elf32_Addr)(addr + addend); 208 where32 = (Elf32_Addr *)where; 209 if (addr == 0) 210 return -1; 211 if (*where32 != val32) 212 *where32 = val32; 213 break; 214 215 case R_X86_64_COPY: /* none */ 216 /* 217 * There shouldn't be copy relocations in kernel 218 * objects. 219 */ 220 printf("kldload: unexpected R_COPY relocation\n"); 221 return -1; 222 break; 223 224 case R_X86_64_GLOB_DAT: /* S */ 225 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 226 addr = lookup(lf, symidx, 1); 227 if (addr == 0) 228 return -1; 229 if (*where != addr) 230 *where = addr; 231 break; 232 233 case R_X86_64_RELATIVE: /* B + A */ 234 addr = relocbase + addend; 235 val = addr; 236 if (*where != val) 237 *where = val; 238 break; 239 240 default: 241 printf("kldload: unexpected relocation type %ld\n", 242 rtype); 243 return -1; 244 } 245 return(0); 246 } 247 248 int 249 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 250 elf_lookup_fn lookup) 251 { 252 253 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 254 } 255 256 int 257 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 258 int type, elf_lookup_fn lookup) 259 { 260 261 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 262 } 263 264 int 265 elf_cpu_load_file(linker_file_t lf __unused) 266 { 267 268 return (0); 269 } 270 271 int 272 elf_cpu_unload_file(linker_file_t lf __unused) 273 { 274 275 return (0); 276 }
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