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("$FreeBSD$"); 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 49struct 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 | SV_SHP, 78 .sv_set_syscall_retval = cpu_set_syscall_retval, 79 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 80 .sv_syscallnames = syscallnames, 81 .sv_shared_page_base = SHAREDPAGE, 82 .sv_shared_page_len = PAGE_SIZE, 83 .sv_schedtail = NULL, 84}; 85INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 86 87static Elf32_Brandinfo freebsd_brand_info = { 88 .brand = ELFOSABI_FREEBSD, 89 .machine = EM_386, 90 .compat_3_brand = "FreeBSD", 91 .emul_path = NULL, 92 .interp_path = "/libexec/ld-elf.so.1", 93 .sysvec = &elf32_freebsd_sysvec, 94 .interp_newpath = NULL, 95 .brand_note = &elf32_freebsd_brandnote, 96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 97}; 98 99SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 100 (sysinit_cfunc_t) elf32_insert_brand_entry, 101 &freebsd_brand_info); 102 103static Elf32_Brandinfo freebsd_brand_oinfo = { 104 .brand = ELFOSABI_FREEBSD, 105 .machine = EM_386, 106 .compat_3_brand = "FreeBSD", 107 .emul_path = NULL, 108 .interp_path = "/usr/libexec/ld-elf.so.1", 109 .sysvec = &elf32_freebsd_sysvec, 110 .interp_newpath = NULL, 111 .brand_note = &elf32_freebsd_brandnote, 112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 113}; 114 115SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 116 (sysinit_cfunc_t) elf32_insert_brand_entry, 117 &freebsd_brand_oinfo); 118 119static Elf32_Brandinfo kfreebsd_brand_info = { 120 .brand = ELFOSABI_FREEBSD, 121 .machine = EM_386, 122 .compat_3_brand = "FreeBSD", 123 .emul_path = NULL, 124 .interp_path = "/lib/ld.so.1", 125 .sysvec = &elf32_freebsd_sysvec, 126 .interp_newpath = NULL, 127 .brand_note = &elf32_kfreebsd_brandnote, 128 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 129}; 130 131SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY, 132 (sysinit_cfunc_t) elf32_insert_brand_entry, 133 &kfreebsd_brand_info); 134 135 136void 137elf32_dump_thread(struct thread *td __unused, void *dst __unused, 138 size_t *off __unused) 139{ 140} 141 142 143/* Process one elf relocation with addend. */ 144static int 145elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 146 int type, int local, elf_lookup_fn lookup) 147{ 148 Elf_Addr *where; 149 Elf_Addr addr; 150 Elf_Addr addend; 151 Elf_Word rtype, symidx; 152 const Elf_Rel *rel; 153 const Elf_Rela *rela; 154 155 switch (type) { 156 case ELF_RELOC_REL: 157 rel = (const Elf_Rel *)data; 158 where = (Elf_Addr *) (relocbase + rel->r_offset); 159 addend = *where; 160 rtype = ELF_R_TYPE(rel->r_info); 161 symidx = ELF_R_SYM(rel->r_info); 162 break; 163 case ELF_RELOC_RELA: 164 rela = (const Elf_Rela *)data; 165 where = (Elf_Addr *) (relocbase + rela->r_offset); 166 addend = rela->r_addend; 167 rtype = ELF_R_TYPE(rela->r_info); 168 symidx = ELF_R_SYM(rela->r_info); 169 break; 170 default: 171 panic("unknown reloc type %d\n", type); 172 } 173 174 if (local) { 175 if (rtype == R_386_RELATIVE) { /* A + B */ 176 addr = elf_relocaddr(lf, relocbase + addend); 177 if (*where != addr) 178 *where = addr; 179 } 180 return (0); 181 } 182 183 switch (rtype) { 184 185 case R_386_NONE: /* none */ 186 break; 187 188 case R_386_32: /* S + A */ 189 addr = lookup(lf, symidx, 1); 190 if (addr == 0) 191 return -1; 192 addr += addend; 193 if (*where != addr) 194 *where = addr; 195 break; 196 197 case R_386_PC32: /* S + A - P */ 198 addr = lookup(lf, symidx, 1); 199 if (addr == 0) 200 return -1; 201 addr += addend - (Elf_Addr)where; 202 if (*where != addr) 203 *where = addr; 204 break; 205 206 case R_386_COPY: /* none */ 207 /* 208 * There shouldn't be copy relocations in kernel 209 * objects. 210 */ 211 printf("kldload: unexpected R_COPY relocation\n"); 212 return -1; 213 break; 214 215 case R_386_GLOB_DAT: /* S */ 216 addr = lookup(lf, symidx, 1); 217 if (addr == 0) 218 return -1; 219 if (*where != addr) 220 *where = addr; 221 break; 222 223 case R_386_RELATIVE: 224 break; 225 226 default: 227 printf("kldload: unexpected relocation type %d\n", 228 rtype); 229 return -1; 230 } 231 return(0); 232} 233 234int 235elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 236 elf_lookup_fn lookup) 237{ 238 239 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 240} 241 242int 243elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 244 int type, elf_lookup_fn lookup) 245{ 246 247 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 248} 249 250int 251elf_cpu_load_file(linker_file_t lf __unused) 252{ 253 254 return (0); 255} 256 257int 258elf_cpu_unload_file(linker_file_t lf __unused) 259{ 260 261 return (0); 262} 263