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: releng/10.1/sys/amd64/amd64/elf_machdep.c 239123 2012-08-07 05:46:36Z pluknet $"); 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/signalvar.h> 40 #include <sys/vnode.h> 41 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 #include <vm/vm_param.h> 45 46 #include <machine/elf.h> 47 #include <machine/md_var.h> 48 49 struct sysentvec elf64_freebsd_sysvec = { 50 .sv_size = SYS_MAXSYSCALL, 51 .sv_table = sysent, 52 .sv_mask = 0, 53 .sv_sigsize = 0, 54 .sv_sigtbl = NULL, 55 .sv_errsize = 0, 56 .sv_errtbl = NULL, 57 .sv_transtrap = NULL, 58 .sv_fixup = __elfN(freebsd_fixup), 59 .sv_sendsig = sendsig, 60 .sv_sigcode = sigcode, 61 .sv_szsigcode = &szsigcode, 62 .sv_prepsyscall = NULL, 63 .sv_name = "FreeBSD ELF64", 64 .sv_coredump = __elfN(coredump), 65 .sv_imgact_try = NULL, 66 .sv_minsigstksz = MINSIGSTKSZ, 67 .sv_pagesize = PAGE_SIZE, 68 .sv_minuser = VM_MIN_ADDRESS, 69 .sv_maxuser = VM_MAXUSER_ADDRESS, 70 .sv_usrstack = USRSTACK, 71 .sv_psstrings = PS_STRINGS, 72 .sv_stackprot = VM_PROT_ALL, 73 .sv_copyout_strings = exec_copyout_strings, 74 .sv_setregs = exec_setregs, 75 .sv_fixlimit = NULL, 76 .sv_maxssiz = NULL, 77 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP, 78 .sv_set_syscall_retval = cpu_set_syscall_retval, 79 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 80 .sv_syscallnames = syscallnames, 81 .sv_shared_page_base = SHAREDPAGE, 82 .sv_shared_page_len = PAGE_SIZE, 83 .sv_schedtail = NULL, 84 }; 85 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 86 87 static Elf64_Brandinfo freebsd_brand_info = { 88 .brand = ELFOSABI_FREEBSD, 89 .machine = EM_X86_64, 90 .compat_3_brand = "FreeBSD", 91 .emul_path = NULL, 92 .interp_path = "/libexec/ld-elf.so.1", 93 .sysvec = &elf64_freebsd_sysvec, 94 .interp_newpath = NULL, 95 .brand_note = &elf64_freebsd_brandnote, 96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 97 }; 98 99 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 100 (sysinit_cfunc_t) elf64_insert_brand_entry, 101 &freebsd_brand_info); 102 103 static Elf64_Brandinfo freebsd_brand_oinfo = { 104 .brand = ELFOSABI_FREEBSD, 105 .machine = EM_X86_64, 106 .compat_3_brand = "FreeBSD", 107 .emul_path = NULL, 108 .interp_path = "/usr/libexec/ld-elf.so.1", 109 .sysvec = &elf64_freebsd_sysvec, 110 .interp_newpath = NULL, 111 .brand_note = &elf64_freebsd_brandnote, 112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 113 }; 114 115 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 116 (sysinit_cfunc_t) elf64_insert_brand_entry, 117 &freebsd_brand_oinfo); 118 119 static Elf64_Brandinfo kfreebsd_brand_info = { 120 .brand = ELFOSABI_FREEBSD, 121 .machine = EM_X86_64, 122 .compat_3_brand = "FreeBSD", 123 .emul_path = NULL, 124 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 125 .sysvec = &elf64_freebsd_sysvec, 126 .interp_newpath = NULL, 127 .brand_note = &elf64_kfreebsd_brandnote, 128 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 129 }; 130 131 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 132 (sysinit_cfunc_t) elf64_insert_brand_entry, 133 &kfreebsd_brand_info); 134 135 void 136 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 137 size_t *off __unused) 138 { 139 } 140 141 142 /* Process one elf relocation with addend. */ 143 static int 144 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 145 int type, int local, elf_lookup_fn lookup) 146 { 147 Elf64_Addr *where, val; 148 Elf32_Addr *where32, val32; 149 Elf_Addr addr; 150 Elf_Addr addend; 151 Elf_Size rtype, symidx; 152 const Elf_Rel *rel; 153 const Elf_Rela *rela; 154 155 switch (type) { 156 case ELF_RELOC_REL: 157 rel = (const Elf_Rel *)data; 158 where = (Elf_Addr *) (relocbase + rel->r_offset); 159 rtype = ELF_R_TYPE(rel->r_info); 160 symidx = ELF_R_SYM(rel->r_info); 161 /* Addend is 32 bit on 32 bit relocs */ 162 switch (rtype) { 163 case R_X86_64_PC32: 164 case R_X86_64_32S: 165 addend = *(Elf32_Addr *)where; 166 break; 167 default: 168 addend = *where; 169 break; 170 } 171 break; 172 case ELF_RELOC_RELA: 173 rela = (const Elf_Rela *)data; 174 where = (Elf_Addr *) (relocbase + rela->r_offset); 175 addend = rela->r_addend; 176 rtype = ELF_R_TYPE(rela->r_info); 177 symidx = ELF_R_SYM(rela->r_info); 178 break; 179 default: 180 panic("unknown reloc type %d\n", type); 181 } 182 183 switch (rtype) { 184 185 case R_X86_64_NONE: /* none */ 186 break; 187 188 case R_X86_64_64: /* S + A */ 189 addr = lookup(lf, symidx, 1); 190 val = addr + addend; 191 if (addr == 0) 192 return -1; 193 if (*where != val) 194 *where = val; 195 break; 196 197 case R_X86_64_PC32: /* S + A - P */ 198 addr = lookup(lf, symidx, 1); 199 where32 = (Elf32_Addr *)where; 200 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 201 if (addr == 0) 202 return -1; 203 if (*where32 != val32) 204 *where32 = val32; 205 break; 206 207 case R_X86_64_32S: /* S + A sign extend */ 208 addr = lookup(lf, symidx, 1); 209 val32 = (Elf32_Addr)(addr + addend); 210 where32 = (Elf32_Addr *)where; 211 if (addr == 0) 212 return -1; 213 if (*where32 != val32) 214 *where32 = val32; 215 break; 216 217 case R_X86_64_COPY: /* none */ 218 /* 219 * There shouldn't be copy relocations in kernel 220 * objects. 221 */ 222 printf("kldload: unexpected R_COPY relocation\n"); 223 return -1; 224 break; 225 226 case R_X86_64_GLOB_DAT: /* S */ 227 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 228 addr = lookup(lf, symidx, 1); 229 if (addr == 0) 230 return -1; 231 if (*where != addr) 232 *where = addr; 233 break; 234 235 case R_X86_64_RELATIVE: /* B + A */ 236 addr = relocbase + addend; 237 val = addr; 238 if (*where != val) 239 *where = val; 240 break; 241 242 default: 243 printf("kldload: unexpected relocation type %ld\n", 244 rtype); 245 return -1; 246 } 247 return(0); 248 } 249 250 int 251 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 252 elf_lookup_fn lookup) 253 { 254 255 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 256 } 257 258 int 259 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 260 int type, elf_lookup_fn lookup) 261 { 262 263 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 264 } 265 266 int 267 elf_cpu_load_file(linker_file_t lf __unused) 268 { 269 270 return (0); 271 } 272 273 int 274 elf_cpu_unload_file(linker_file_t lf __unused) 275 { 276 277 return (0); 278 }
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