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("$FreeBSD$"); 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 | SV_SHP, 79 .sv_set_syscall_retval = cpu_set_syscall_retval, 80 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 81 .sv_syscallnames = syscallnames, 82 .sv_shared_page_base = SHAREDPAGE, 83 .sv_shared_page_len = PAGE_SIZE, 84 .sv_schedtail = NULL, 85 }; 86 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 87 88 static Elf64_Brandinfo freebsd_brand_info = { 89 .brand = ELFOSABI_FREEBSD, 90 .machine = EM_X86_64, 91 .compat_3_brand = "FreeBSD", 92 .emul_path = NULL, 93 .interp_path = "/libexec/ld-elf.so.1", 94 .sysvec = &elf64_freebsd_sysvec, 95 .interp_newpath = NULL, 96 .brand_note = &elf64_freebsd_brandnote, 97 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 98 }; 99 100 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 101 (sysinit_cfunc_t) elf64_insert_brand_entry, 102 &freebsd_brand_info); 103 104 static Elf64_Brandinfo freebsd_brand_oinfo = { 105 .brand = ELFOSABI_FREEBSD, 106 .machine = EM_X86_64, 107 .compat_3_brand = "FreeBSD", 108 .emul_path = NULL, 109 .interp_path = "/usr/libexec/ld-elf.so.1", 110 .sysvec = &elf64_freebsd_sysvec, 111 .interp_newpath = NULL, 112 .brand_note = &elf64_freebsd_brandnote, 113 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 114 }; 115 116 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 117 (sysinit_cfunc_t) elf64_insert_brand_entry, 118 &freebsd_brand_oinfo); 119 120 static Elf64_Brandinfo kfreebsd_brand_info = { 121 .brand = ELFOSABI_FREEBSD, 122 .machine = EM_X86_64, 123 .compat_3_brand = "FreeBSD", 124 .emul_path = NULL, 125 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 126 .sysvec = &elf64_freebsd_sysvec, 127 .interp_newpath = NULL, 128 .brand_note = &elf64_kfreebsd_brandnote, 129 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 130 }; 131 132 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 133 (sysinit_cfunc_t) elf64_insert_brand_entry, 134 &kfreebsd_brand_info); 135 136 void 137 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 138 size_t *off __unused) 139 { 140 } 141 142 143 /* Process one elf relocation with addend. */ 144 static int 145 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 146 int type, int local, elf_lookup_fn lookup) 147 { 148 Elf64_Addr *where, val; 149 Elf32_Addr *where32, val32; 150 Elf_Addr addr; 151 Elf_Addr addend; 152 Elf_Size rtype, symidx; 153 const Elf_Rel *rel; 154 const Elf_Rela *rela; 155 156 switch (type) { 157 case ELF_RELOC_REL: 158 rel = (const Elf_Rel *)data; 159 where = (Elf_Addr *) (relocbase + rel->r_offset); 160 rtype = ELF_R_TYPE(rel->r_info); 161 symidx = ELF_R_SYM(rel->r_info); 162 /* Addend is 32 bit on 32 bit relocs */ 163 switch (rtype) { 164 case R_X86_64_PC32: 165 case R_X86_64_32S: 166 case R_X86_64_PLT32: 167 addend = *(Elf32_Addr *)where; 168 break; 169 default: 170 addend = *where; 171 break; 172 } 173 break; 174 case ELF_RELOC_RELA: 175 rela = (const Elf_Rela *)data; 176 where = (Elf_Addr *) (relocbase + rela->r_offset); 177 addend = rela->r_addend; 178 rtype = ELF_R_TYPE(rela->r_info); 179 symidx = ELF_R_SYM(rela->r_info); 180 break; 181 default: 182 panic("unknown reloc type %d\n", type); 183 } 184 185 switch (rtype) { 186 187 case R_X86_64_NONE: /* none */ 188 break; 189 190 case R_X86_64_64: /* S + A */ 191 addr = lookup(lf, symidx, 1); 192 val = addr + addend; 193 if (addr == 0) 194 return -1; 195 if (*where != val) 196 *where = val; 197 break; 198 199 case R_X86_64_PC32: /* S + A - P */ 200 case R_X86_64_PLT32: /* L + A - P, L is PLT location for 201 the symbol, which we treat as S */ 202 addr = lookup(lf, symidx, 1); 203 where32 = (Elf32_Addr *)where; 204 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 205 if (addr == 0) 206 return -1; 207 if (*where32 != val32) 208 *where32 = val32; 209 break; 210 211 case R_X86_64_32S: /* S + A sign extend */ 212 addr = lookup(lf, symidx, 1); 213 val32 = (Elf32_Addr)(addr + addend); 214 where32 = (Elf32_Addr *)where; 215 if (addr == 0) 216 return -1; 217 if (*where32 != val32) 218 *where32 = val32; 219 break; 220 221 case R_X86_64_COPY: /* none */ 222 /* 223 * There shouldn't be copy relocations in kernel 224 * objects. 225 */ 226 printf("kldload: unexpected R_COPY relocation\n"); 227 return -1; 228 break; 229 230 case R_X86_64_GLOB_DAT: /* S */ 231 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 232 addr = lookup(lf, symidx, 1); 233 if (addr == 0) 234 return -1; 235 if (*where != addr) 236 *where = addr; 237 break; 238 239 case R_X86_64_RELATIVE: /* B + A */ 240 addr = relocbase + addend; 241 val = addr; 242 if (*where != val) 243 *where = val; 244 break; 245 246 default: 247 printf("kldload: unexpected relocation type %ld\n", 248 rtype); 249 return -1; 250 } 251 return(0); 252 } 253 254 int 255 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 256 elf_lookup_fn lookup) 257 { 258 259 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 260 } 261 262 int 263 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 264 int type, elf_lookup_fn lookup) 265 { 266 267 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 268 } 269 270 int 271 elf_cpu_load_file(linker_file_t lf __unused) 272 { 273 274 return (0); 275 } 276 277 int 278 elf_cpu_unload_file(linker_file_t lf __unused) 279 { 280 281 return (0); 282 }
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