Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
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
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/8.4/sys/amd64/amd64/elf_machdep.c 222846 2011-06-08 03:45:40Z dchagin $"); 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 .sv_schedtail = NULL, 83 }; 84 85 static Elf64_Brandinfo freebsd_brand_info = { 86 .brand = ELFOSABI_FREEBSD, 87 .machine = EM_X86_64, 88 .compat_3_brand = "FreeBSD", 89 .emul_path = NULL, 90 .interp_path = "/libexec/ld-elf.so.1", 91 .sysvec = &elf64_freebsd_sysvec, 92 .interp_newpath = NULL, 93 .brand_note = &elf64_freebsd_brandnote, 94 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 95 }; 96 97 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 98 (sysinit_cfunc_t) elf64_insert_brand_entry, 99 &freebsd_brand_info); 100 101 static Elf64_Brandinfo freebsd_brand_oinfo = { 102 .brand = ELFOSABI_FREEBSD, 103 .machine = EM_X86_64, 104 .compat_3_brand = "FreeBSD", 105 .emul_path = NULL, 106 .interp_path = "/usr/libexec/ld-elf.so.1", 107 .sysvec = &elf64_freebsd_sysvec, 108 .interp_newpath = NULL, 109 .brand_note = &elf64_freebsd_brandnote, 110 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 111 }; 112 113 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 114 (sysinit_cfunc_t) elf64_insert_brand_entry, 115 &freebsd_brand_oinfo); 116 117 static Elf64_Brandinfo kfreebsd_brand_info = { 118 .brand = ELFOSABI_FREEBSD, 119 .machine = EM_X86_64, 120 .compat_3_brand = "FreeBSD", 121 .emul_path = NULL, 122 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 123 .sysvec = &elf64_freebsd_sysvec, 124 .interp_newpath = NULL, 125 .brand_note = &elf64_kfreebsd_brandnote, 126 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 127 }; 128 129 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 130 (sysinit_cfunc_t) elf64_insert_brand_entry, 131 &kfreebsd_brand_info); 132 133 134 void 135 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 136 size_t *off __unused) 137 { 138 } 139 140 141 /* Process one elf relocation with addend. */ 142 static int 143 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 144 int type, int local, elf_lookup_fn lookup) 145 { 146 Elf64_Addr *where, val; 147 Elf32_Addr *where32, val32; 148 Elf_Addr addr; 149 Elf_Addr addend; 150 Elf_Size rtype, symidx; 151 const Elf_Rel *rel; 152 const Elf_Rela *rela; 153 154 switch (type) { 155 case ELF_RELOC_REL: 156 rel = (const Elf_Rel *)data; 157 where = (Elf_Addr *) (relocbase + rel->r_offset); 158 rtype = ELF_R_TYPE(rel->r_info); 159 symidx = ELF_R_SYM(rel->r_info); 160 /* Addend is 32 bit on 32 bit relocs */ 161 switch (rtype) { 162 case R_X86_64_PC32: 163 case R_X86_64_32S: 164 addend = *(Elf32_Addr *)where; 165 break; 166 default: 167 addend = *where; 168 break; 169 } 170 break; 171 case ELF_RELOC_RELA: 172 rela = (const Elf_Rela *)data; 173 where = (Elf_Addr *) (relocbase + rela->r_offset); 174 addend = rela->r_addend; 175 rtype = ELF_R_TYPE(rela->r_info); 176 symidx = ELF_R_SYM(rela->r_info); 177 break; 178 default: 179 panic("unknown reloc type %d\n", type); 180 } 181 182 switch (rtype) { 183 184 case R_X86_64_NONE: /* none */ 185 break; 186 187 case R_X86_64_64: /* S + A */ 188 addr = lookup(lf, symidx, 1); 189 val = addr + addend; 190 if (addr == 0) 191 return -1; 192 if (*where != val) 193 *where = val; 194 break; 195 196 case R_X86_64_PC32: /* S + A - P */ 197 addr = lookup(lf, symidx, 1); 198 where32 = (Elf32_Addr *)where; 199 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 200 if (addr == 0) 201 return -1; 202 if (*where32 != val32) 203 *where32 = val32; 204 break; 205 206 case R_X86_64_32S: /* S + A sign extend */ 207 addr = lookup(lf, symidx, 1); 208 val32 = (Elf32_Addr)(addr + addend); 209 where32 = (Elf32_Addr *)where; 210 if (addr == 0) 211 return -1; 212 if (*where32 != val32) 213 *where32 = val32; 214 break; 215 216 case R_X86_64_COPY: /* none */ 217 /* 218 * There shouldn't be copy relocations in kernel 219 * objects. 220 */ 221 printf("kldload: unexpected R_COPY relocation\n"); 222 return -1; 223 break; 224 225 case R_X86_64_GLOB_DAT: /* S */ 226 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 227 addr = lookup(lf, symidx, 1); 228 if (addr == 0) 229 return -1; 230 if (*where != addr) 231 *where = addr; 232 break; 233 234 case R_X86_64_RELATIVE: /* B + A */ 235 addr = relocbase + addend; 236 val = addr; 237 if (*where != val) 238 *where = val; 239 break; 240 241 default: 242 printf("kldload: unexpected relocation type %ld\n", 243 rtype); 244 return -1; 245 } 246 return(0); 247 } 248 249 int 250 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 251 elf_lookup_fn lookup) 252 { 253 254 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 255 } 256 257 int 258 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 259 int type, elf_lookup_fn lookup) 260 { 261 262 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 263 } 264 265 int 266 elf_cpu_load_file(linker_file_t lf __unused) 267 { 268 269 return (0); 270 } 271 272 int 273 elf_cpu_unload_file(linker_file_t lf __unused) 274 { 275 276 return (0); 277 }
Cache object: d372ebd1c004435e904f2e472548e8b6
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]