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