Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/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 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD: releng/8.2/sys/i386/i386/elf_machdep.c 214755 2010-11-03 21:21:12Z kib $"); 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/proc.h> 36 #include <sys/sysent.h> 37 #include <sys/imgact_elf.h> 38 #include <sys/syscall.h> 39 #include <sys/signalvar.h> 40 #include <sys/vnode.h> 41 42 #include <vm/vm.h> 43 #include <vm/pmap.h> 44 #include <vm/vm_param.h> 45 46 #include <machine/elf.h> 47 #include <machine/md_var.h> 48 49 struct sysentvec elf32_freebsd_sysvec = { 50 .sv_size = SYS_MAXSYSCALL, 51 .sv_table = sysent, 52 .sv_mask = 0, 53 .sv_sigsize = 0, 54 .sv_sigtbl = NULL, 55 .sv_errsize = 0, 56 .sv_errtbl = NULL, 57 .sv_transtrap = NULL, 58 .sv_fixup = __elfN(freebsd_fixup), 59 .sv_sendsig = sendsig, 60 .sv_sigcode = sigcode, 61 .sv_szsigcode = &szsigcode, 62 .sv_prepsyscall = NULL, 63 .sv_name = "FreeBSD ELF32", 64 .sv_coredump = __elfN(coredump), 65 .sv_imgact_try = NULL, 66 .sv_minsigstksz = MINSIGSTKSZ, 67 .sv_pagesize = PAGE_SIZE, 68 .sv_minuser = VM_MIN_ADDRESS, 69 .sv_maxuser = VM_MAXUSER_ADDRESS, 70 .sv_usrstack = USRSTACK, 71 .sv_psstrings = PS_STRINGS, 72 .sv_stackprot = VM_PROT_ALL, 73 .sv_copyout_strings = exec_copyout_strings, 74 .sv_setregs = exec_setregs, 75 .sv_fixlimit = NULL, 76 .sv_maxssiz = NULL, 77 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32, 78 .sv_set_syscall_retval = cpu_set_syscall_retval, 79 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 80 .sv_syscallnames = syscallnames, 81 }; 82 83 static Elf32_Brandinfo freebsd_brand_info = { 84 .brand = ELFOSABI_FREEBSD, 85 .machine = EM_386, 86 .compat_3_brand = "FreeBSD", 87 .emul_path = NULL, 88 .interp_path = "/libexec/ld-elf.so.1", 89 .sysvec = &elf32_freebsd_sysvec, 90 .interp_newpath = NULL, 91 .brand_note = &elf32_freebsd_brandnote, 92 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 93 }; 94 95 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 96 (sysinit_cfunc_t) elf32_insert_brand_entry, 97 &freebsd_brand_info); 98 99 static Elf32_Brandinfo freebsd_brand_oinfo = { 100 .brand = ELFOSABI_FREEBSD, 101 .machine = EM_386, 102 .compat_3_brand = "FreeBSD", 103 .emul_path = NULL, 104 .interp_path = "/usr/libexec/ld-elf.so.1", 105 .sysvec = &elf32_freebsd_sysvec, 106 .interp_newpath = NULL, 107 .brand_note = &elf32_freebsd_brandnote, 108 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 109 }; 110 111 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 112 (sysinit_cfunc_t) elf32_insert_brand_entry, 113 &freebsd_brand_oinfo); 114 115 static Elf32_Brandinfo kfreebsd_brand_info = { 116 .brand = ELFOSABI_FREEBSD, 117 .machine = EM_386, 118 .compat_3_brand = "FreeBSD", 119 .emul_path = NULL, 120 .interp_path = "/lib/ld.so.1", 121 .sysvec = &elf32_freebsd_sysvec, 122 .interp_newpath = NULL, 123 .brand_note = &elf32_kfreebsd_brandnote, 124 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 125 }; 126 127 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY, 128 (sysinit_cfunc_t) elf32_insert_brand_entry, 129 &kfreebsd_brand_info); 130 131 132 void 133 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 134 size_t *off __unused) 135 { 136 } 137 138 139 /* Process one elf relocation with addend. */ 140 static int 141 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 142 int type, int local, elf_lookup_fn lookup) 143 { 144 Elf_Addr *where; 145 Elf_Addr addr; 146 Elf_Addr addend; 147 Elf_Word rtype, symidx; 148 const Elf_Rel *rel; 149 const Elf_Rela *rela; 150 151 switch (type) { 152 case ELF_RELOC_REL: 153 rel = (const Elf_Rel *)data; 154 where = (Elf_Addr *) (relocbase + rel->r_offset); 155 addend = *where; 156 rtype = ELF_R_TYPE(rel->r_info); 157 symidx = ELF_R_SYM(rel->r_info); 158 break; 159 case ELF_RELOC_RELA: 160 rela = (const Elf_Rela *)data; 161 where = (Elf_Addr *) (relocbase + rela->r_offset); 162 addend = rela->r_addend; 163 rtype = ELF_R_TYPE(rela->r_info); 164 symidx = ELF_R_SYM(rela->r_info); 165 break; 166 default: 167 panic("unknown reloc type %d\n", type); 168 } 169 170 if (local) { 171 if (rtype == R_386_RELATIVE) { /* A + B */ 172 addr = elf_relocaddr(lf, relocbase + addend); 173 if (*where != addr) 174 *where = addr; 175 } 176 return (0); 177 } 178 179 switch (rtype) { 180 181 case R_386_NONE: /* none */ 182 break; 183 184 case R_386_32: /* S + A */ 185 addr = lookup(lf, symidx, 1); 186 if (addr == 0) 187 return -1; 188 addr += addend; 189 if (*where != addr) 190 *where = addr; 191 break; 192 193 case R_386_PC32: /* S + A - P */ 194 addr = lookup(lf, symidx, 1); 195 if (addr == 0) 196 return -1; 197 addr += addend - (Elf_Addr)where; 198 if (*where != addr) 199 *where = addr; 200 break; 201 202 case R_386_COPY: /* none */ 203 /* 204 * There shouldn't be copy relocations in kernel 205 * objects. 206 */ 207 printf("kldload: unexpected R_COPY relocation\n"); 208 return -1; 209 break; 210 211 case R_386_GLOB_DAT: /* S */ 212 addr = lookup(lf, symidx, 1); 213 if (addr == 0) 214 return -1; 215 if (*where != addr) 216 *where = addr; 217 break; 218 219 case R_386_RELATIVE: 220 break; 221 222 default: 223 printf("kldload: unexpected relocation type %d\n", 224 rtype); 225 return -1; 226 } 227 return(0); 228 } 229 230 int 231 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 232 elf_lookup_fn lookup) 233 { 234 235 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 236 } 237 238 int 239 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 240 int type, elf_lookup_fn lookup) 241 { 242 243 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 244 } 245 246 int 247 elf_cpu_load_file(linker_file_t lf __unused) 248 { 249 250 return (0); 251 } 252 253 int 254 elf_cpu_unload_file(linker_file_t lf __unused) 255 { 256 257 return (0); 258 }
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