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/8.1/sys/mips/mips/elf_machdep.c 203786 2010-02-11 18:34:06Z mjacob $"); 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/syscall.h> 40 #include <sys/signalvar.h> 41 #include <sys/vnode.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 #include <vm/vm_param.h> 46 47 #include <machine/elf.h> 48 #include <machine/md_var.h> 49 50 struct sysentvec elf32_freebsd_sysvec = { 51 .sv_size = SYS_MAXSYSCALL, 52 .sv_table = sysent, 53 .sv_mask = 0, 54 .sv_sigsize = 0, 55 .sv_sigtbl = NULL, 56 .sv_errsize = 0, 57 .sv_errtbl = NULL, 58 .sv_transtrap = NULL, 59 .sv_fixup = __elfN(freebsd_fixup), 60 .sv_sendsig = sendsig, 61 .sv_sigcode = sigcode, 62 .sv_szsigcode = &szsigcode, 63 .sv_prepsyscall = NULL, 64 .sv_name = "FreeBSD ELF32", 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_ILP32 79 }; 80 81 static Elf32_Brandinfo freebsd_brand_info = { 82 .brand = ELFOSABI_FREEBSD, 83 .machine = EM_MIPS, 84 .compat_3_brand = "FreeBSD", 85 .emul_path = NULL, 86 .interp_path = "/libexec/ld-elf.so.1", 87 .sysvec = &elf32_freebsd_sysvec, 88 .interp_newpath = NULL, 89 .brand_note = &elf32_freebsd_brandnote, 90 .flags = BI_BRAND_NOTE 91 }; 92 93 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 94 (sysinit_cfunc_t) elf32_insert_brand_entry, 95 &freebsd_brand_info); 96 97 void 98 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 99 size_t *off __unused) 100 { 101 } 102 103 /* Process one elf relocation with addend. */ 104 static int 105 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 106 int type, int local, elf_lookup_fn lookup) 107 { 108 Elf_Addr *where = (Elf_Addr *)NULL; 109 Elf_Addr addr; 110 Elf_Addr addend = (Elf_Addr)0; 111 Elf_Word rtype = (Elf_Word)0, symidx; 112 const Elf_Rel *rel; 113 const Elf_Rela *rela; 114 115 switch (type) { 116 case ELF_RELOC_REL: 117 rel = (const Elf_Rel *)data; 118 where = (Elf_Addr *) (relocbase + rel->r_offset); 119 addend = *where; 120 rtype = ELF_R_TYPE(rel->r_info); 121 symidx = ELF_R_SYM(rel->r_info); 122 break; 123 case ELF_RELOC_RELA: 124 rela = (const Elf_Rela *)data; 125 where = (Elf_Addr *) (relocbase + rela->r_offset); 126 addend = rela->r_addend; 127 rtype = ELF_R_TYPE(rela->r_info); 128 symidx = ELF_R_SYM(rela->r_info); 129 break; 130 default: 131 panic("unknown reloc type %d\n", type); 132 } 133 134 if (local) { 135 #if 0 /* TBD */ 136 if (rtype == R_386_RELATIVE) { /* A + B */ 137 addr = elf_relocaddr(lf, relocbase + addend); 138 if (*where != addr) 139 *where = addr; 140 } 141 return (0); 142 #endif 143 } 144 145 switch (rtype) { 146 147 case R_MIPS_NONE: /* none */ 148 break; 149 150 case R_MIPS_16: /* S + sign-extend(A) */ 151 /* 152 * There shouldn't be R_MIPS_16 relocs in kernel objects. 153 */ 154 printf("kldload: unexpected R_MIPS_16 relocation\n"); 155 return -1; 156 break; 157 158 case R_MIPS_32: /* S + A - P */ 159 addr = lookup(lf, symidx, 1); 160 if (addr == 0) 161 return -1; 162 addr += addend; 163 if (*where != addr) 164 *where = addr; 165 break; 166 167 case R_MIPS_REL32: /* A - EA + S */ 168 /* 169 * There shouldn't be R_MIPS_REL32 relocs in kernel objects? 170 */ 171 printf("kldload: unexpected R_MIPS_REL32 relocation\n"); 172 return -1; 173 break; 174 175 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */ 176 break; 177 178 case R_MIPS_HI16: 179 /* extern/local: ((AHL + S) - ((short)(AHL + S)) >> 16 */ 180 /* _gp_disp: ((AHL + GP - P) - (short)(AHL + GP - P)) >> 16 */ 181 break; 182 183 case R_MIPS_LO16: 184 /* extern/local: AHL + S */ 185 /* _gp_disp: AHL + GP - P + 4 */ 186 break; 187 188 case R_MIPS_GPREL16: 189 /* extern/local: ((AHL + S) - ((short)(AHL + S)) >> 16 */ 190 /* _gp_disp: ((AHL + GP - P) - (short)(AHL + GP - P)) >> 16 */ 191 break; 192 193 case R_MIPS_LITERAL: /* sign-extend(A) + L */ 194 break; 195 196 case R_MIPS_GOT16: /* external: G */ 197 /* local: tbd */ 198 break; 199 200 case R_MIPS_PC16: /* sign-extend(A) + S - P */ 201 break; 202 203 case R_MIPS_CALL16: /* G */ 204 break; 205 206 case R_MIPS_GPREL32: /* A + S + GP0 - GP */ 207 break; 208 209 case R_MIPS_GOTHI16: /* (G - (short)G) >> 16 + A */ 210 break; 211 212 case R_MIPS_GOTLO16: /* G & 0xffff */ 213 break; 214 215 case R_MIPS_CALLHI16: /* (G - (short)G) >> 16 + A */ 216 break; 217 218 case R_MIPS_CALLLO16: /* G & 0xffff */ 219 break; 220 221 default: 222 printf("kldload: unexpected relocation type %d\n", 223 rtype); 224 return (-1); 225 } 226 return(0); 227 } 228 229 int 230 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 231 elf_lookup_fn lookup) 232 { 233 234 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 235 } 236 237 int 238 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 239 int type, elf_lookup_fn lookup) 240 { 241 242 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 243 } 244 245 int 246 elf_cpu_load_file(linker_file_t lf __unused) 247 { 248 249 return (0); 250 } 251 252 int 253 elf_cpu_unload_file(linker_file_t lf __unused) 254 { 255 256 return (0); 257 }
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