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