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/11.2/sys/mips/mips/elf_machdep.c 331722 2018-03-29 02:50:57Z eadler $"); 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_errsize = 0, 58 .sv_errtbl = NULL, 59 .sv_transtrap = NULL, 60 .sv_fixup = __elfN(freebsd_fixup), 61 .sv_sendsig = sendsig, 62 .sv_sigcode = sigcode, 63 .sv_szsigcode = &szsigcode, 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, 79 .sv_set_syscall_retval = cpu_set_syscall_retval, 80 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 81 .sv_syscallnames = syscallnames, 82 .sv_schedtail = NULL, 83 .sv_thread_detach = NULL, 84 .sv_trap = NULL, 85 }; 86 87 static Elf64_Brandinfo freebsd_brand_info = { 88 .brand = ELFOSABI_FREEBSD, 89 .machine = EM_MIPS, 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 .flags = 0 96 }; 97 98 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY, 99 (sysinit_cfunc_t) elf64_insert_brand_entry, 100 &freebsd_brand_info); 101 102 void 103 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 104 size_t *off __unused) 105 { 106 } 107 #else 108 struct sysentvec elf32_freebsd_sysvec = { 109 .sv_size = SYS_MAXSYSCALL, 110 .sv_table = sysent, 111 .sv_mask = 0, 112 .sv_errsize = 0, 113 .sv_errtbl = NULL, 114 .sv_transtrap = NULL, 115 .sv_fixup = __elfN(freebsd_fixup), 116 .sv_sendsig = sendsig, 117 .sv_sigcode = sigcode, 118 .sv_szsigcode = &szsigcode, 119 .sv_name = "FreeBSD ELF32", 120 .sv_coredump = __elfN(coredump), 121 .sv_imgact_try = NULL, 122 .sv_minsigstksz = MINSIGSTKSZ, 123 .sv_pagesize = PAGE_SIZE, 124 .sv_minuser = VM_MIN_ADDRESS, 125 .sv_maxuser = VM_MAXUSER_ADDRESS, 126 .sv_usrstack = USRSTACK, 127 .sv_psstrings = PS_STRINGS, 128 .sv_stackprot = VM_PROT_ALL, 129 .sv_copyout_strings = exec_copyout_strings, 130 .sv_setregs = exec_setregs, 131 .sv_fixlimit = NULL, 132 .sv_maxssiz = NULL, 133 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 134 .sv_set_syscall_retval = cpu_set_syscall_retval, 135 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 136 .sv_syscallnames = syscallnames, 137 .sv_schedtail = NULL, 138 .sv_thread_detach = NULL, 139 .sv_trap = NULL, 140 }; 141 142 static Elf32_Brandinfo freebsd_brand_info = { 143 .brand = ELFOSABI_FREEBSD, 144 .machine = EM_MIPS, 145 .compat_3_brand = "FreeBSD", 146 .emul_path = NULL, 147 .interp_path = "/libexec/ld-elf.so.1", 148 .sysvec = &elf32_freebsd_sysvec, 149 .interp_newpath = NULL, 150 .flags = 0 151 }; 152 153 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 154 (sysinit_cfunc_t) elf32_insert_brand_entry, 155 &freebsd_brand_info); 156 157 void 158 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 159 size_t *off __unused) 160 { 161 } 162 #endif 163 164 /* Process one elf relocation with addend. */ 165 static int 166 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 167 int type, int local, elf_lookup_fn lookup) 168 { 169 Elf32_Addr *where = (Elf32_Addr *)NULL; 170 Elf_Addr addr; 171 Elf_Addr addend = (Elf_Addr)0; 172 Elf_Word rtype = (Elf_Word)0, symidx; 173 const Elf_Rel *rel = NULL; 174 const Elf_Rela *rela = NULL; 175 int error; 176 177 /* 178 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16 179 */ 180 static Elf_Addr ahl; 181 static Elf32_Addr *where_hi16; 182 183 switch (type) { 184 case ELF_RELOC_REL: 185 rel = (const Elf_Rel *)data; 186 where = (Elf32_Addr *) (relocbase + rel->r_offset); 187 rtype = ELF_R_TYPE(rel->r_info); 188 symidx = ELF_R_SYM(rel->r_info); 189 switch (rtype) { 190 case R_MIPS_64: 191 addend = *(Elf64_Addr *)where; 192 break; 193 default: 194 addend = *where; 195 break; 196 } 197 198 break; 199 case ELF_RELOC_RELA: 200 rela = (const Elf_Rela *)data; 201 where = (Elf32_Addr *) (relocbase + rela->r_offset); 202 addend = rela->r_addend; 203 rtype = ELF_R_TYPE(rela->r_info); 204 symidx = ELF_R_SYM(rela->r_info); 205 break; 206 default: 207 panic("unknown reloc type %d\n", type); 208 } 209 210 switch (rtype) { 211 case R_MIPS_NONE: /* none */ 212 break; 213 214 case R_MIPS_32: /* S + A */ 215 error = lookup(lf, symidx, 1, &addr); 216 if (error != 0) 217 return (-1); 218 addr += addend; 219 if (*where != addr) 220 *where = (Elf32_Addr)addr; 221 break; 222 223 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */ 224 error = lookup(lf, symidx, 1, &addr); 225 if (error != 0) 226 return (-1); 227 228 addend &= 0x03ffffff; 229 /* 230 * Addendum for .rela R_MIPS_26 is not shifted right 231 */ 232 if (rela == NULL) 233 addend <<= 2; 234 235 addr += ((Elf_Addr)where & 0xf0000000) | addend; 236 addr >>= 2; 237 238 *where &= ~0x03ffffff; 239 *where |= addr & 0x03ffffff; 240 break; 241 242 case R_MIPS_64: /* S + A */ 243 error = lookup(lf, symidx, 1, &addr); 244 if (error != 0) 245 return (-1); 246 addr += addend; 247 if (*(Elf64_Addr*)where != addr) 248 *(Elf64_Addr*)where = addr; 249 break; 250 251 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */ 252 if (rela != NULL) { 253 error = lookup(lf, symidx, 1, &addr); 254 if (error != 0) 255 return (-1); 256 addr += addend; 257 *where &= 0xffff0000; 258 *where |= ((((long long) addr + 0x8000LL) >> 16) & 0xffff); 259 } 260 else { 261 ahl = addend << 16; 262 where_hi16 = where; 263 } 264 break; 265 266 case R_MIPS_LO16: /* AHL + S */ 267 if (rela != NULL) { 268 error = lookup(lf, symidx, 1, &addr); 269 if (error != 0) 270 return (-1); 271 addr += addend; 272 *where &= 0xffff0000; 273 *where |= addr & 0xffff; 274 } 275 else { 276 ahl += (int16_t)addend; 277 error = lookup(lf, symidx, 1, &addr); 278 if (error != 0) 279 return (-1); 280 281 addend &= 0xffff0000; 282 addend |= (uint16_t)(ahl + addr); 283 *where = addend; 284 285 addend = *where_hi16; 286 addend &= 0xffff0000; 287 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16; 288 *where_hi16 = addend; 289 } 290 291 break; 292 293 case R_MIPS_HIGHER: /* %higher(A+S) */ 294 error = lookup(lf, symidx, 1, &addr); 295 if (error != 0) 296 return (-1); 297 addr += addend; 298 *where &= 0xffff0000; 299 *where |= (((long long)addr + 0x80008000LL) >> 32) & 0xffff; 300 break; 301 302 case R_MIPS_HIGHEST: /* %highest(A+S) */ 303 error = lookup(lf, symidx, 1, &addr); 304 if (error != 0) 305 return (-1); 306 addr += addend; 307 *where &= 0xffff0000; 308 *where |= (((long long)addr + 0x800080008000LL) >> 48) & 0xffff; 309 break; 310 311 default: 312 printf("kldload: unexpected relocation type %d\n", 313 rtype); 314 return (-1); 315 } 316 317 return(0); 318 } 319 320 int 321 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 322 elf_lookup_fn lookup) 323 { 324 325 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 326 } 327 328 int 329 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 330 int type, elf_lookup_fn lookup) 331 { 332 333 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 334 } 335 336 int 337 elf_cpu_load_file(linker_file_t lf __unused) 338 { 339 340 /* 341 * Sync the I and D caches to make sure our relocations are visible. 342 */ 343 mips_icache_sync_all(); 344 345 return (0); 346 } 347 348 int 349 elf_cpu_unload_file(linker_file_t lf __unused) 350 { 351 352 return (0); 353 }
Cache object: 54225394d3e6a058da9eb290a80ea3ae
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