Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/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/11.2/sys/amd64/amd64/elf_machdep.c 333720 2018-05-17 15:24:53Z 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/fpu.h> 48 #include <machine/md_var.h> 49 50 struct sysentvec elf64_freebsd_sysvec = { 51 .sv_size = SYS_MAXSYSCALL, 52 .sv_table = sysent, 53 .sv_mask = 0, 54 .sv_errsize = 0, 55 .sv_errtbl = NULL, 56 .sv_transtrap = NULL, 57 .sv_fixup = __elfN(freebsd_fixup), 58 .sv_sendsig = sendsig, 59 .sv_sigcode = sigcode, 60 .sv_szsigcode = &szsigcode, 61 .sv_name = "FreeBSD ELF64", 62 .sv_coredump = __elfN(coredump), 63 .sv_imgact_try = NULL, 64 .sv_minsigstksz = MINSIGSTKSZ, 65 .sv_pagesize = PAGE_SIZE, 66 .sv_minuser = VM_MIN_ADDRESS, 67 .sv_maxuser = VM_MAXUSER_ADDRESS, 68 .sv_usrstack = USRSTACK, 69 .sv_psstrings = PS_STRINGS, 70 .sv_stackprot = VM_PROT_ALL, 71 .sv_copyout_strings = exec_copyout_strings, 72 .sv_setregs = exec_setregs, 73 .sv_fixlimit = NULL, 74 .sv_maxssiz = NULL, 75 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_TIMEKEEP, 76 .sv_set_syscall_retval = cpu_set_syscall_retval, 77 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 78 .sv_syscallnames = syscallnames, 79 .sv_shared_page_base = SHAREDPAGE, 80 .sv_shared_page_len = PAGE_SIZE, 81 .sv_schedtail = NULL, 82 .sv_thread_detach = NULL, 83 .sv_trap = NULL, 84 }; 85 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 86 87 void 88 amd64_lower_shared_page(struct sysentvec *sv) 89 { 90 if (hw_lower_amd64_sharedpage != 0) { 91 sv->sv_maxuser -= PAGE_SIZE; 92 sv->sv_shared_page_base -= PAGE_SIZE; 93 sv->sv_usrstack -= PAGE_SIZE; 94 sv->sv_psstrings -= PAGE_SIZE; 95 } 96 } 97 98 /* 99 * Do this fixup before INIT_SYSENTVEC (SI_ORDER_ANY) because the latter 100 * uses the value of sv_shared_page_base. 101 */ 102 SYSINIT(elf64_sysvec_fixup, SI_SUB_EXEC, SI_ORDER_FIRST, 103 (sysinit_cfunc_t) amd64_lower_shared_page, 104 &elf64_freebsd_sysvec); 105 106 static Elf64_Brandinfo freebsd_brand_info = { 107 .brand = ELFOSABI_FREEBSD, 108 .machine = EM_X86_64, 109 .compat_3_brand = "FreeBSD", 110 .emul_path = NULL, 111 .interp_path = "/libexec/ld-elf.so.1", 112 .sysvec = &elf64_freebsd_sysvec, 113 .interp_newpath = NULL, 114 .brand_note = &elf64_freebsd_brandnote, 115 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 116 }; 117 118 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 119 (sysinit_cfunc_t) elf64_insert_brand_entry, 120 &freebsd_brand_info); 121 122 static Elf64_Brandinfo freebsd_brand_oinfo = { 123 .brand = ELFOSABI_FREEBSD, 124 .machine = EM_X86_64, 125 .compat_3_brand = "FreeBSD", 126 .emul_path = NULL, 127 .interp_path = "/usr/libexec/ld-elf.so.1", 128 .sysvec = &elf64_freebsd_sysvec, 129 .interp_newpath = NULL, 130 .brand_note = &elf64_freebsd_brandnote, 131 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 132 }; 133 134 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 135 (sysinit_cfunc_t) elf64_insert_brand_entry, 136 &freebsd_brand_oinfo); 137 138 static Elf64_Brandinfo kfreebsd_brand_info = { 139 .brand = ELFOSABI_FREEBSD, 140 .machine = EM_X86_64, 141 .compat_3_brand = "FreeBSD", 142 .emul_path = NULL, 143 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 144 .sysvec = &elf64_freebsd_sysvec, 145 .interp_newpath = NULL, 146 .brand_note = &elf64_kfreebsd_brandnote, 147 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 148 }; 149 150 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 151 (sysinit_cfunc_t) elf64_insert_brand_entry, 152 &kfreebsd_brand_info); 153 154 void 155 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 156 { 157 void *buf; 158 size_t len; 159 160 len = 0; 161 if (use_xsave) { 162 if (dst != NULL) { 163 fpugetregs(td); 164 len += elf64_populate_note(NT_X86_XSTATE, 165 get_pcb_user_save_td(td), dst, 166 cpu_max_ext_state_size, &buf); 167 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 168 xsave_mask; 169 } else 170 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL, 171 cpu_max_ext_state_size, NULL); 172 } 173 *off = len; 174 } 175 176 #define ERI_LOCAL 0x0001 177 #define ERI_ONLYIFUNC 0x0002 178 179 /* Process one elf relocation with addend. */ 180 static int 181 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 182 int type, elf_lookup_fn lookup, int flags) 183 { 184 Elf64_Addr *where, val; 185 Elf32_Addr *where32, val32; 186 Elf_Addr addr; 187 Elf_Addr addend; 188 Elf_Size rtype, symidx; 189 const Elf_Rel *rel; 190 const Elf_Rela *rela; 191 int error; 192 193 switch (type) { 194 case ELF_RELOC_REL: 195 rel = (const Elf_Rel *)data; 196 where = (Elf_Addr *) (relocbase + rel->r_offset); 197 rtype = ELF_R_TYPE(rel->r_info); 198 symidx = ELF_R_SYM(rel->r_info); 199 /* Addend is 32 bit on 32 bit relocs */ 200 switch (rtype) { 201 case R_X86_64_PC32: 202 case R_X86_64_32S: 203 addend = *(Elf32_Addr *)where; 204 break; 205 default: 206 addend = *where; 207 break; 208 } 209 break; 210 case ELF_RELOC_RELA: 211 rela = (const Elf_Rela *)data; 212 where = (Elf_Addr *) (relocbase + rela->r_offset); 213 addend = rela->r_addend; 214 rtype = ELF_R_TYPE(rela->r_info); 215 symidx = ELF_R_SYM(rela->r_info); 216 break; 217 default: 218 panic("unknown reloc type %d\n", type); 219 } 220 221 if (((flags & ERI_ONLYIFUNC) == 0) ^ (rtype != R_X86_64_IRELATIVE)) 222 return (0); 223 224 switch (rtype) { 225 case R_X86_64_NONE: /* none */ 226 break; 227 228 case R_X86_64_64: /* S + A */ 229 error = lookup(lf, symidx, 1, &addr); 230 val = addr + addend; 231 if (error != 0) 232 return -1; 233 if (*where != val) 234 *where = val; 235 break; 236 237 case R_X86_64_PC32: /* S + A - P */ 238 error = lookup(lf, symidx, 1, &addr); 239 where32 = (Elf32_Addr *)where; 240 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 241 if (error != 0) 242 return -1; 243 if (*where32 != val32) 244 *where32 = val32; 245 break; 246 247 case R_X86_64_32S: /* S + A sign extend */ 248 error = lookup(lf, symidx, 1, &addr); 249 val32 = (Elf32_Addr)(addr + addend); 250 where32 = (Elf32_Addr *)where; 251 if (error != 0) 252 return -1; 253 if (*where32 != val32) 254 *where32 = val32; 255 break; 256 257 case R_X86_64_COPY: /* none */ 258 /* 259 * There shouldn't be copy relocations in kernel 260 * objects. 261 */ 262 printf("kldload: unexpected R_COPY relocation\n"); 263 return (-1); 264 break; 265 266 case R_X86_64_GLOB_DAT: /* S */ 267 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 268 error = lookup(lf, symidx, 1, &addr); 269 if (error != 0) 270 return -1; 271 if (*where != addr) 272 *where = addr; 273 break; 274 275 case R_X86_64_RELATIVE: /* B + A */ 276 addr = relocbase + addend; 277 val = addr; 278 if (*where != val) 279 *where = val; 280 break; 281 282 case R_X86_64_IRELATIVE: 283 addr = relocbase + addend; 284 val = ((Elf64_Addr (*)(void))addr)(); 285 if (*where != val) 286 *where = val; 287 break; 288 289 default: 290 printf("kldload: unexpected relocation type %ld\n", 291 rtype); 292 return (-1); 293 } 294 return (0); 295 } 296 297 int 298 elf_reloc_ifunc(linker_file_t lf, Elf_Addr relocbase, const void *data, 299 int type, elf_lookup_fn lookup) 300 { 301 302 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 303 ERI_ONLYIFUNC)); 304 } 305 306 int 307 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 308 elf_lookup_fn lookup) 309 { 310 311 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0)); 312 } 313 314 int 315 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 316 int type, elf_lookup_fn lookup) 317 { 318 319 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 320 ERI_LOCAL)); 321 } 322 323 int 324 elf_cpu_load_file(linker_file_t lf __unused) 325 { 326 327 return (0); 328 } 329 330 int 331 elf_cpu_unload_file(linker_file_t lf __unused) 332 { 333 334 return (0); 335 }
Cache object: 8cb6766f45366704ca7bd2a921bc0f0a
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