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:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
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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/11.0/sys/i386/i386/elf_machdep.c 293613 2016-01-09 20:18:53Z dchagin $"); 28 29 #include "opt_cpu.h" 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/proc.h> 38 #include <sys/sysent.h> 39 #include <sys/imgact_elf.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/npx.h> 51 52 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 53 #define CPU_ENABLE_SSE 54 #endif 55 56 struct sysentvec elf32_freebsd_sysvec = { 57 .sv_size = SYS_MAXSYSCALL, 58 .sv_table = sysent, 59 .sv_mask = 0, 60 .sv_errsize = 0, 61 .sv_errtbl = NULL, 62 .sv_transtrap = NULL, 63 .sv_fixup = __elfN(freebsd_fixup), 64 .sv_sendsig = sendsig, 65 .sv_sigcode = sigcode, 66 .sv_szsigcode = &szsigcode, 67 .sv_name = "FreeBSD ELF32", 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_IA32 | SV_ILP32 | SV_SHP | 82 SV_TIMEKEEP, 83 .sv_set_syscall_retval = cpu_set_syscall_retval, 84 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 85 .sv_syscallnames = syscallnames, 86 .sv_shared_page_base = SHAREDPAGE, 87 .sv_shared_page_len = PAGE_SIZE, 88 .sv_schedtail = NULL, 89 .sv_thread_detach = NULL, 90 .sv_trap = NULL, 91 }; 92 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 93 94 static Elf32_Brandinfo freebsd_brand_info = { 95 .brand = ELFOSABI_FREEBSD, 96 .machine = EM_386, 97 .compat_3_brand = "FreeBSD", 98 .emul_path = NULL, 99 .interp_path = "/libexec/ld-elf.so.1", 100 .sysvec = &elf32_freebsd_sysvec, 101 .interp_newpath = NULL, 102 .brand_note = &elf32_freebsd_brandnote, 103 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 104 }; 105 106 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 107 (sysinit_cfunc_t) elf32_insert_brand_entry, 108 &freebsd_brand_info); 109 110 static Elf32_Brandinfo freebsd_brand_oinfo = { 111 .brand = ELFOSABI_FREEBSD, 112 .machine = EM_386, 113 .compat_3_brand = "FreeBSD", 114 .emul_path = NULL, 115 .interp_path = "/usr/libexec/ld-elf.so.1", 116 .sysvec = &elf32_freebsd_sysvec, 117 .interp_newpath = NULL, 118 .brand_note = &elf32_freebsd_brandnote, 119 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 120 }; 121 122 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 123 (sysinit_cfunc_t) elf32_insert_brand_entry, 124 &freebsd_brand_oinfo); 125 126 static Elf32_Brandinfo kfreebsd_brand_info = { 127 .brand = ELFOSABI_FREEBSD, 128 .machine = EM_386, 129 .compat_3_brand = "FreeBSD", 130 .emul_path = NULL, 131 .interp_path = "/lib/ld.so.1", 132 .sysvec = &elf32_freebsd_sysvec, 133 .interp_newpath = NULL, 134 .brand_note = &elf32_kfreebsd_brandnote, 135 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 136 }; 137 138 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY, 139 (sysinit_cfunc_t) elf32_insert_brand_entry, 140 &kfreebsd_brand_info); 141 142 143 void 144 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 145 { 146 #ifdef CPU_ENABLE_SSE 147 void *buf; 148 #endif 149 size_t len; 150 151 len = 0; 152 #ifdef CPU_ENABLE_SSE 153 if (use_xsave) { 154 if (dst != NULL) { 155 npxgetregs(td); 156 len += elf32_populate_note(NT_X86_XSTATE, 157 get_pcb_user_save_td(td), dst, 158 cpu_max_ext_state_size, &buf); 159 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 160 xsave_mask; 161 } else 162 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL, 163 cpu_max_ext_state_size, NULL); 164 } 165 #endif 166 *off = len; 167 } 168 169 /* Process one elf relocation with addend. */ 170 static int 171 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 172 int type, int local, elf_lookup_fn lookup) 173 { 174 Elf_Addr *where; 175 Elf_Addr addr; 176 Elf_Addr addend; 177 Elf_Word rtype, symidx; 178 const Elf_Rel *rel; 179 const Elf_Rela *rela; 180 int error; 181 182 switch (type) { 183 case ELF_RELOC_REL: 184 rel = (const Elf_Rel *)data; 185 where = (Elf_Addr *) (relocbase + rel->r_offset); 186 addend = *where; 187 rtype = ELF_R_TYPE(rel->r_info); 188 symidx = ELF_R_SYM(rel->r_info); 189 break; 190 case ELF_RELOC_RELA: 191 rela = (const Elf_Rela *)data; 192 where = (Elf_Addr *) (relocbase + rela->r_offset); 193 addend = rela->r_addend; 194 rtype = ELF_R_TYPE(rela->r_info); 195 symidx = ELF_R_SYM(rela->r_info); 196 break; 197 default: 198 panic("unknown reloc type %d\n", type); 199 } 200 201 if (local) { 202 if (rtype == R_386_RELATIVE) { /* A + B */ 203 addr = elf_relocaddr(lf, relocbase + addend); 204 if (*where != addr) 205 *where = addr; 206 } 207 return (0); 208 } 209 210 switch (rtype) { 211 212 case R_386_NONE: /* none */ 213 break; 214 215 case R_386_32: /* S + A */ 216 error = lookup(lf, symidx, 1, &addr); 217 if (error != 0) 218 return -1; 219 addr += addend; 220 if (*where != addr) 221 *where = addr; 222 break; 223 224 case R_386_PC32: /* S + A - P */ 225 error = lookup(lf, symidx, 1, &addr); 226 if (error != 0) 227 return -1; 228 addr += addend - (Elf_Addr)where; 229 if (*where != addr) 230 *where = addr; 231 break; 232 233 case R_386_COPY: /* none */ 234 /* 235 * There shouldn't be copy relocations in kernel 236 * objects. 237 */ 238 printf("kldload: unexpected R_COPY relocation\n"); 239 return -1; 240 break; 241 242 case R_386_GLOB_DAT: /* S */ 243 error = lookup(lf, symidx, 1, &addr); 244 if (error != 0) 245 return -1; 246 if (*where != addr) 247 *where = addr; 248 break; 249 250 case R_386_RELATIVE: 251 break; 252 253 default: 254 printf("kldload: unexpected relocation type %d\n", 255 rtype); 256 return -1; 257 } 258 return(0); 259 } 260 261 int 262 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 263 elf_lookup_fn lookup) 264 { 265 266 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 267 } 268 269 int 270 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 271 int type, elf_lookup_fn lookup) 272 { 273 274 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 275 } 276 277 int 278 elf_cpu_load_file(linker_file_t lf __unused) 279 { 280 281 return (0); 282 } 283 284 int 285 elf_cpu_unload_file(linker_file_t lf __unused) 286 { 287 288 return (0); 289 }
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