Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/elf_machdep.c
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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 * from: src/sys/i386/i386/elf_machdep.c,v 1.20 2004/08/11 02:35:05 marcel 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: releng/10.2/sys/mips/mips/elf_machdep.c 230046 2012-01-13 07:00:47Z gonzo $"); 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/exec.h> 35 #include <sys/imgact.h> 36 #include <sys/linker.h> 37 #include <sys/sysent.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/proc.h> 40 #include <sys/syscall.h> 41 #include <sys/signalvar.h> 42 #include <sys/vnode.h> 43 44 #include <vm/vm.h> 45 #include <vm/pmap.h> 46 #include <vm/vm_param.h> 47 48 #include <machine/elf.h> 49 #include <machine/md_var.h> 50 #include <machine/cache.h> 51 52 #ifdef __mips_n64 53 struct sysentvec elf64_freebsd_sysvec = { 54 .sv_size = SYS_MAXSYSCALL, 55 .sv_table = sysent, 56 .sv_mask = 0, 57 .sv_sigsize = 0, 58 .sv_sigtbl = NULL, 59 .sv_errsize = 0, 60 .sv_errtbl = NULL, 61 .sv_transtrap = NULL, 62 .sv_fixup = __elfN(freebsd_fixup), 63 .sv_sendsig = sendsig, 64 .sv_sigcode = sigcode, 65 .sv_szsigcode = &szsigcode, 66 .sv_prepsyscall = NULL, 67 .sv_name = "FreeBSD ELF64", 68 .sv_coredump = __elfN(coredump), 69 .sv_imgact_try = NULL, 70 .sv_minsigstksz = MINSIGSTKSZ, 71 .sv_pagesize = PAGE_SIZE, 72 .sv_minuser = VM_MIN_ADDRESS, 73 .sv_maxuser = VM_MAXUSER_ADDRESS, 74 .sv_usrstack = USRSTACK, 75 .sv_psstrings = PS_STRINGS, 76 .sv_stackprot = VM_PROT_ALL, 77 .sv_copyout_strings = exec_copyout_strings, 78 .sv_setregs = exec_setregs, 79 .sv_fixlimit = NULL, 80 .sv_maxssiz = NULL, 81 .sv_flags = SV_ABI_FREEBSD | SV_LP64, 82 .sv_set_syscall_retval = cpu_set_syscall_retval, 83 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 84 .sv_syscallnames = syscallnames, 85 .sv_schedtail = NULL, 86 }; 87 88 static Elf64_Brandinfo freebsd_brand_info = { 89 .brand = ELFOSABI_FREEBSD, 90 .machine = EM_MIPS, 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 .flags = 0 97 }; 98 99 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY, 100 (sysinit_cfunc_t) elf64_insert_brand_entry, 101 &freebsd_brand_info); 102 103 void 104 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 105 size_t *off __unused) 106 { 107 } 108 #else 109 struct sysentvec elf32_freebsd_sysvec = { 110 .sv_size = SYS_MAXSYSCALL, 111 .sv_table = sysent, 112 .sv_mask = 0, 113 .sv_sigsize = 0, 114 .sv_sigtbl = NULL, 115 .sv_errsize = 0, 116 .sv_errtbl = NULL, 117 .sv_transtrap = NULL, 118 .sv_fixup = __elfN(freebsd_fixup), 119 .sv_sendsig = sendsig, 120 .sv_sigcode = sigcode, 121 .sv_szsigcode = &szsigcode, 122 .sv_prepsyscall = NULL, 123 .sv_name = "FreeBSD ELF32", 124 .sv_coredump = __elfN(coredump), 125 .sv_imgact_try = NULL, 126 .sv_minsigstksz = MINSIGSTKSZ, 127 .sv_pagesize = PAGE_SIZE, 128 .sv_minuser = VM_MIN_ADDRESS, 129 .sv_maxuser = VM_MAXUSER_ADDRESS, 130 .sv_usrstack = USRSTACK, 131 .sv_psstrings = PS_STRINGS, 132 .sv_stackprot = VM_PROT_ALL, 133 .sv_copyout_strings = exec_copyout_strings, 134 .sv_setregs = exec_setregs, 135 .sv_fixlimit = NULL, 136 .sv_maxssiz = NULL, 137 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 138 .sv_set_syscall_retval = cpu_set_syscall_retval, 139 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 140 .sv_syscallnames = syscallnames, 141 .sv_schedtail = NULL, 142 }; 143 144 static Elf32_Brandinfo freebsd_brand_info = { 145 .brand = ELFOSABI_FREEBSD, 146 .machine = EM_MIPS, 147 .compat_3_brand = "FreeBSD", 148 .emul_path = NULL, 149 .interp_path = "/libexec/ld-elf.so.1", 150 .sysvec = &elf32_freebsd_sysvec, 151 .interp_newpath = NULL, 152 .flags = 0 153 }; 154 155 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 156 (sysinit_cfunc_t) elf32_insert_brand_entry, 157 &freebsd_brand_info); 158 159 void 160 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 161 size_t *off __unused) 162 { 163 } 164 #endif 165 166 /* Process one elf relocation with addend. */ 167 static int 168 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 169 int type, int local, elf_lookup_fn lookup) 170 { 171 Elf32_Addr *where = (Elf32_Addr *)NULL; 172 Elf_Addr addr; 173 Elf_Addr addend = (Elf_Addr)0; 174 Elf_Word rtype = (Elf_Word)0, symidx; 175 const Elf_Rel *rel = NULL; 176 const Elf_Rela *rela = NULL; 177 178 /* 179 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16 180 */ 181 static Elf_Addr ahl; 182 static Elf32_Addr *where_hi16; 183 184 switch (type) { 185 case ELF_RELOC_REL: 186 rel = (const Elf_Rel *)data; 187 where = (Elf32_Addr *) (relocbase + rel->r_offset); 188 rtype = ELF_R_TYPE(rel->r_info); 189 symidx = ELF_R_SYM(rel->r_info); 190 switch (rtype) { 191 case R_MIPS_64: 192 addend = *(Elf64_Addr *)where; 193 break; 194 default: 195 addend = *where; 196 break; 197 } 198 199 break; 200 case ELF_RELOC_RELA: 201 rela = (const Elf_Rela *)data; 202 where = (Elf32_Addr *) (relocbase + rela->r_offset); 203 addend = rela->r_addend; 204 rtype = ELF_R_TYPE(rela->r_info); 205 symidx = ELF_R_SYM(rela->r_info); 206 break; 207 default: 208 panic("unknown reloc type %d\n", type); 209 } 210 211 switch (rtype) { 212 case R_MIPS_NONE: /* none */ 213 break; 214 215 case R_MIPS_32: /* S + A */ 216 addr = lookup(lf, symidx, 1); 217 if (addr == 0) 218 return (-1); 219 addr += addend; 220 if (*where != addr) 221 *where = (Elf32_Addr)addr; 222 break; 223 224 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */ 225 addr = lookup(lf, symidx, 1); 226 if (addr == 0) 227 return (-1); 228 229 addend &= 0x03ffffff; 230 /* 231 * Addendum for .rela R_MIPS_26 is not shifted right 232 */ 233 if (rela == NULL) 234 addend <<= 2; 235 236 addr += ((Elf_Addr)where & 0xf0000000) | addend; 237 addr >>= 2; 238 239 *where &= ~0x03ffffff; 240 *where |= addr & 0x03ffffff; 241 break; 242 243 case R_MIPS_64: /* S + A */ 244 addr = lookup(lf, symidx, 1); 245 if (addr == 0) 246 return (-1); 247 addr += addend; 248 if (*(Elf64_Addr*)where != addr) 249 *(Elf64_Addr*)where = addr; 250 break; 251 252 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */ 253 if (rela != NULL) { 254 addr = lookup(lf, symidx, 1); 255 if (addr == 0) 256 return (-1); 257 addr += addend; 258 *where &= 0xffff0000; 259 *where |= ((((long long) addr + 0x8000LL) >> 16) & 0xffff); 260 } 261 else { 262 ahl = addend << 16; 263 where_hi16 = where; 264 } 265 break; 266 267 case R_MIPS_LO16: /* AHL + S */ 268 if (rela != NULL) { 269 addr = lookup(lf, symidx, 1); 270 if (addr == 0) 271 return (-1); 272 addr += addend; 273 *where &= 0xffff0000; 274 *where |= addr & 0xffff; 275 } 276 else { 277 ahl += (int16_t)addend; 278 addr = lookup(lf, symidx, 1); 279 if (addr == 0) 280 return (-1); 281 282 addend &= 0xffff0000; 283 addend |= (uint16_t)(ahl + addr); 284 *where = addend; 285 286 addend = *where_hi16; 287 addend &= 0xffff0000; 288 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16; 289 *where_hi16 = addend; 290 } 291 292 break; 293 294 case R_MIPS_HIGHER: /* %higher(A+S) */ 295 addr = lookup(lf, symidx, 1); 296 if (addr == 0) 297 return (-1); 298 addr += addend; 299 *where &= 0xffff0000; 300 *where |= (((long long)addr + 0x80008000LL) >> 32) & 0xffff; 301 break; 302 303 case R_MIPS_HIGHEST: /* %highest(A+S) */ 304 addr = lookup(lf, symidx, 1); 305 if (addr == 0) 306 return (-1); 307 addr += addend; 308 *where &= 0xffff0000; 309 *where |= (((long long)addr + 0x800080008000LL) >> 48) & 0xffff; 310 break; 311 312 default: 313 printf("kldload: unexpected relocation type %d\n", 314 rtype); 315 return (-1); 316 } 317 318 return(0); 319 } 320 321 int 322 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 323 elf_lookup_fn lookup) 324 { 325 326 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 327 } 328 329 int 330 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 331 int type, elf_lookup_fn lookup) 332 { 333 334 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 335 } 336 337 int 338 elf_cpu_load_file(linker_file_t lf __unused) 339 { 340 341 /* 342 * Sync the I and D caches to make sure our relocations are visible. 343 */ 344 mips_icache_sync_all(); 345 346 return (0); 347 } 348 349 int 350 elf_cpu_unload_file(linker_file_t lf __unused) 351 { 352 353 return (0); 354 }
Cache object: 222a0828a98eab532501ddc20729ad74
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