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
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 1996-1998 John D. Polstra. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: releng/12.0/sys/i386/i386/elf_machdep.c 338211 2018-08-22 20:44:30Z markj $"); 30 31 #include "opt_cpu.h" 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/systm.h> 36 #include <sys/exec.h> 37 #include <sys/imgact.h> 38 #include <sys/linker.h> 39 #include <sys/proc.h> 40 #include <sys/sysent.h> 41 #include <sys/imgact_elf.h> 42 #include <sys/syscall.h> 43 #include <sys/signalvar.h> 44 #include <sys/vnode.h> 45 46 #include <vm/vm.h> 47 #include <vm/pmap.h> 48 #include <vm/vm_param.h> 49 50 #include <machine/elf.h> 51 #include <machine/md_var.h> 52 #include <machine/npx.h> 53 54 struct sysentvec elf32_freebsd_sysvec = { 55 .sv_size = SYS_MAXSYSCALL, 56 .sv_table = sysent, 57 .sv_mask = 0, 58 .sv_errsize = 0, 59 .sv_errtbl = NULL, 60 .sv_transtrap = NULL, 61 .sv_fixup = __elfN(freebsd_fixup), 62 .sv_sendsig = sendsig, 63 .sv_sigcode = sigcode, 64 .sv_szsigcode = &szsigcode, 65 .sv_name = "FreeBSD ELF32", 66 .sv_coredump = __elfN(coredump), 67 .sv_imgact_try = NULL, 68 .sv_minsigstksz = MINSIGSTKSZ, 69 .sv_pagesize = PAGE_SIZE, 70 .sv_minuser = VM_MIN_ADDRESS, 71 .sv_maxuser = VM_MAXUSER_ADDRESS, 72 .sv_usrstack = USRSTACK, 73 .sv_psstrings = PS_STRINGS, 74 .sv_stackprot = VM_PROT_ALL, 75 .sv_copyout_strings = exec_copyout_strings, 76 .sv_setregs = exec_setregs, 77 .sv_fixlimit = NULL, 78 .sv_maxssiz = NULL, 79 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP | 80 SV_TIMEKEEP, 81 .sv_set_syscall_retval = cpu_set_syscall_retval, 82 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 83 .sv_syscallnames = syscallnames, 84 .sv_shared_page_base = SHAREDPAGE, 85 .sv_shared_page_len = PAGE_SIZE, 86 .sv_schedtail = NULL, 87 .sv_thread_detach = NULL, 88 .sv_trap = NULL, 89 }; 90 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 91 92 static Elf32_Brandinfo freebsd_brand_info = { 93 .brand = ELFOSABI_FREEBSD, 94 .machine = EM_386, 95 .compat_3_brand = "FreeBSD", 96 .emul_path = NULL, 97 .interp_path = "/libexec/ld-elf.so.1", 98 .sysvec = &elf32_freebsd_sysvec, 99 .interp_newpath = NULL, 100 .brand_note = &elf32_freebsd_brandnote, 101 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 102 }; 103 104 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 105 (sysinit_cfunc_t) elf32_insert_brand_entry, 106 &freebsd_brand_info); 107 108 static Elf32_Brandinfo freebsd_brand_oinfo = { 109 .brand = ELFOSABI_FREEBSD, 110 .machine = EM_386, 111 .compat_3_brand = "FreeBSD", 112 .emul_path = NULL, 113 .interp_path = "/usr/libexec/ld-elf.so.1", 114 .sysvec = &elf32_freebsd_sysvec, 115 .interp_newpath = NULL, 116 .brand_note = &elf32_freebsd_brandnote, 117 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 118 }; 119 120 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 121 (sysinit_cfunc_t) elf32_insert_brand_entry, 122 &freebsd_brand_oinfo); 123 124 static Elf32_Brandinfo kfreebsd_brand_info = { 125 .brand = ELFOSABI_FREEBSD, 126 .machine = EM_386, 127 .compat_3_brand = "FreeBSD", 128 .emul_path = NULL, 129 .interp_path = "/lib/ld.so.1", 130 .sysvec = &elf32_freebsd_sysvec, 131 .interp_newpath = NULL, 132 .brand_note = &elf32_kfreebsd_brandnote, 133 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 134 }; 135 136 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY, 137 (sysinit_cfunc_t) elf32_insert_brand_entry, 138 &kfreebsd_brand_info); 139 140 void 141 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 142 { 143 void *buf; 144 size_t len; 145 146 len = 0; 147 if (use_xsave) { 148 if (dst != NULL) { 149 npxgetregs(td); 150 len += elf32_populate_note(NT_X86_XSTATE, 151 get_pcb_user_save_td(td), dst, 152 cpu_max_ext_state_size, &buf); 153 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 154 xsave_mask; 155 } else 156 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL, 157 cpu_max_ext_state_size, NULL); 158 } 159 *off = len; 160 } 161 162 bool 163 elf_is_ifunc_reloc(Elf_Size r_info) 164 { 165 166 return (ELF_R_TYPE(r_info) == R_386_IRELATIVE); 167 } 168 169 #define ERI_LOCAL 0x0001 170 171 /* Process one elf relocation with addend. */ 172 static int 173 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 174 int type, elf_lookup_fn lookup, int flags) 175 { 176 Elf_Addr *where; 177 Elf_Addr addr; 178 Elf_Addr addend; 179 Elf_Word rtype, symidx; 180 const Elf_Rel *rel; 181 const Elf_Rela *rela; 182 int error; 183 184 switch (type) { 185 case ELF_RELOC_REL: 186 rel = (const Elf_Rel *)data; 187 where = (Elf_Addr *) (relocbase + rel->r_offset); 188 addend = *where; 189 rtype = ELF_R_TYPE(rel->r_info); 190 symidx = ELF_R_SYM(rel->r_info); 191 break; 192 case ELF_RELOC_RELA: 193 rela = (const Elf_Rela *)data; 194 where = (Elf_Addr *) (relocbase + rela->r_offset); 195 addend = rela->r_addend; 196 rtype = ELF_R_TYPE(rela->r_info); 197 symidx = ELF_R_SYM(rela->r_info); 198 break; 199 default: 200 panic("unknown reloc type %d\n", type); 201 } 202 203 if ((flags & ERI_LOCAL) != 0) { 204 if (rtype == R_386_RELATIVE) { /* A + B */ 205 addr = elf_relocaddr(lf, relocbase + addend); 206 if (*where != addr) 207 *where = addr; 208 } 209 return (0); 210 } 211 212 switch (rtype) { 213 214 case R_386_NONE: /* none */ 215 break; 216 217 case R_386_32: /* S + A */ 218 error = lookup(lf, symidx, 1, &addr); 219 if (error != 0) 220 return -1; 221 addr += addend; 222 if (*where != addr) 223 *where = addr; 224 break; 225 226 case R_386_PC32: /* S + A - P */ 227 error = lookup(lf, symidx, 1, &addr); 228 if (error != 0) 229 return -1; 230 addr += addend - (Elf_Addr)where; 231 if (*where != addr) 232 *where = addr; 233 break; 234 235 case R_386_COPY: /* none */ 236 /* 237 * There shouldn't be copy relocations in kernel 238 * objects. 239 */ 240 printf("kldload: unexpected R_COPY relocation\n"); 241 return -1; 242 break; 243 244 case R_386_GLOB_DAT: /* S */ 245 error = lookup(lf, symidx, 1, &addr); 246 if (error != 0) 247 return -1; 248 if (*where != addr) 249 *where = addr; 250 break; 251 252 case R_386_RELATIVE: 253 break; 254 255 case R_386_IRELATIVE: 256 addr = relocbase + addend; 257 addr = ((Elf_Addr (*)(void))addr)(); 258 if (*where != addr) 259 *where = addr; 260 break; 261 default: 262 printf("kldload: unexpected relocation type %d\n", 263 rtype); 264 return -1; 265 } 266 return(0); 267 } 268 269 int 270 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 271 elf_lookup_fn lookup) 272 { 273 274 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0)); 275 } 276 277 int 278 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 279 int type, elf_lookup_fn lookup) 280 { 281 282 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 283 ERI_LOCAL)); 284 } 285 286 int 287 elf_cpu_load_file(linker_file_t lf __unused) 288 { 289 290 return (0); 291 } 292 293 int 294 elf_cpu_unload_file(linker_file_t lf __unused) 295 { 296 297 return (0); 298 }
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