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
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 * 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/8.2/sys/mips/mips/elf_machdep.c 215938 2010-11-27 12:26:40Z jchandra $"); 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 }; 83 84 static Elf64_Brandinfo freebsd_brand_info = { 85 .brand = ELFOSABI_FREEBSD, 86 .machine = EM_MIPS, 87 .compat_3_brand = "FreeBSD", 88 .emul_path = NULL, 89 .interp_path = "/libexec/ld-elf.so.1", 90 .sysvec = &elf64_freebsd_sysvec, 91 .interp_newpath = NULL, 92 .flags = 0 93 }; 94 95 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY, 96 (sysinit_cfunc_t) elf64_insert_brand_entry, 97 &freebsd_brand_info); 98 99 void 100 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 101 size_t *off __unused) 102 { 103 } 104 #else 105 struct sysentvec elf32_freebsd_sysvec = { 106 .sv_size = SYS_MAXSYSCALL, 107 .sv_table = sysent, 108 .sv_mask = 0, 109 .sv_sigsize = 0, 110 .sv_sigtbl = NULL, 111 .sv_errsize = 0, 112 .sv_errtbl = NULL, 113 .sv_transtrap = NULL, 114 .sv_fixup = __elfN(freebsd_fixup), 115 .sv_sendsig = sendsig, 116 .sv_sigcode = sigcode, 117 .sv_szsigcode = &szsigcode, 118 .sv_prepsyscall = NULL, 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 = NULL, /* XXXKIB */ 136 .sv_syscallnames = syscallnames, 137 }; 138 139 static Elf32_Brandinfo freebsd_brand_info = { 140 .brand = ELFOSABI_FREEBSD, 141 .machine = EM_MIPS, 142 .compat_3_brand = "FreeBSD", 143 .emul_path = NULL, 144 .interp_path = "/libexec/ld-elf.so.1", 145 .sysvec = &elf32_freebsd_sysvec, 146 .interp_newpath = NULL, 147 .flags = 0 148 }; 149 150 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 151 (sysinit_cfunc_t) elf32_insert_brand_entry, 152 &freebsd_brand_info); 153 154 void 155 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 156 size_t *off __unused) 157 { 158 } 159 #endif 160 161 /* Process one elf relocation with addend. */ 162 static int 163 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 164 int type, int local, elf_lookup_fn lookup) 165 { 166 Elf_Addr *where = (Elf_Addr *)NULL; 167 Elf_Addr addr; 168 Elf_Addr addend = (Elf_Addr)0; 169 Elf_Word rtype = (Elf_Word)0, symidx; 170 const Elf_Rel *rel; 171 172 /* 173 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16 174 */ 175 static Elf_Addr ahl; 176 static Elf_Addr *where_hi16; 177 178 switch (type) { 179 case ELF_RELOC_REL: 180 rel = (const Elf_Rel *)data; 181 where = (Elf_Addr *) (relocbase + rel->r_offset); 182 addend = *where; 183 rtype = ELF_R_TYPE(rel->r_info); 184 symidx = ELF_R_SYM(rel->r_info); 185 break; 186 default: 187 panic("unknown reloc type %d\n", type); 188 } 189 190 switch (rtype) { 191 case R_MIPS_NONE: /* none */ 192 break; 193 194 case R_MIPS_32: /* S + A */ 195 addr = lookup(lf, symidx, 1); 196 if (addr == 0) 197 return (-1); 198 addr += addend; 199 if (*where != addr) 200 *where = addr; 201 break; 202 203 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */ 204 addr = lookup(lf, symidx, 1); 205 if (addr == 0) 206 return (-1); 207 208 addend &= 0x03ffffff; 209 addend <<= 2; 210 211 addr += ((Elf_Addr)where & 0xf0000000) | addend; 212 addr >>= 2; 213 214 *where &= ~0x03ffffff; 215 *where |= addr & 0x03ffffff; 216 break; 217 218 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */ 219 ahl = addend << 16; 220 where_hi16 = where; 221 break; 222 223 case R_MIPS_LO16: /* AHL + S */ 224 ahl += (int16_t)addend; 225 addr = lookup(lf, symidx, 1); 226 if (addr == 0) 227 return (-1); 228 229 addend &= 0xffff0000; 230 addend |= (uint16_t)(ahl + addr); 231 *where = addend; 232 233 addend = *where_hi16; 234 addend &= 0xffff0000; 235 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16; 236 *where_hi16 = addend; 237 break; 238 239 default: 240 printf("kldload: unexpected relocation type %d\n", 241 rtype); 242 return (-1); 243 } 244 return(0); 245 } 246 247 int 248 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 249 elf_lookup_fn lookup) 250 { 251 252 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 253 } 254 255 int 256 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 257 int type, elf_lookup_fn lookup) 258 { 259 260 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 261 } 262 263 int 264 elf_cpu_load_file(linker_file_t lf __unused) 265 { 266 267 /* 268 * Sync the I and D caches to make sure our relocations are visible. 269 */ 270 mips_icache_sync_all(); 271 272 return (0); 273 } 274 275 int 276 elf_cpu_unload_file(linker_file_t lf __unused) 277 { 278 279 return (0); 280 }
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