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/11.1/sys/amd64/amd64/elf_machdep.c 293613 2016-01-09 20:18:53Z dchagin $"); 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 static Elf64_Brandinfo freebsd_brand_info = { 88 .brand = ELFOSABI_FREEBSD, 89 .machine = EM_X86_64, 90 .compat_3_brand = "FreeBSD", 91 .emul_path = NULL, 92 .interp_path = "/libexec/ld-elf.so.1", 93 .sysvec = &elf64_freebsd_sysvec, 94 .interp_newpath = NULL, 95 .brand_note = &elf64_freebsd_brandnote, 96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 97 }; 98 99 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 100 (sysinit_cfunc_t) elf64_insert_brand_entry, 101 &freebsd_brand_info); 102 103 static Elf64_Brandinfo freebsd_brand_oinfo = { 104 .brand = ELFOSABI_FREEBSD, 105 .machine = EM_X86_64, 106 .compat_3_brand = "FreeBSD", 107 .emul_path = NULL, 108 .interp_path = "/usr/libexec/ld-elf.so.1", 109 .sysvec = &elf64_freebsd_sysvec, 110 .interp_newpath = NULL, 111 .brand_note = &elf64_freebsd_brandnote, 112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 113 }; 114 115 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 116 (sysinit_cfunc_t) elf64_insert_brand_entry, 117 &freebsd_brand_oinfo); 118 119 static Elf64_Brandinfo kfreebsd_brand_info = { 120 .brand = ELFOSABI_FREEBSD, 121 .machine = EM_X86_64, 122 .compat_3_brand = "FreeBSD", 123 .emul_path = NULL, 124 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 125 .sysvec = &elf64_freebsd_sysvec, 126 .interp_newpath = NULL, 127 .brand_note = &elf64_kfreebsd_brandnote, 128 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 129 }; 130 131 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 132 (sysinit_cfunc_t) elf64_insert_brand_entry, 133 &kfreebsd_brand_info); 134 135 void 136 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 137 { 138 void *buf; 139 size_t len; 140 141 len = 0; 142 if (use_xsave) { 143 if (dst != NULL) { 144 fpugetregs(td); 145 len += elf64_populate_note(NT_X86_XSTATE, 146 get_pcb_user_save_td(td), dst, 147 cpu_max_ext_state_size, &buf); 148 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 149 xsave_mask; 150 } else 151 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL, 152 cpu_max_ext_state_size, NULL); 153 } 154 *off = len; 155 } 156 157 /* Process one elf relocation with addend. */ 158 static int 159 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 160 int type, int local, elf_lookup_fn lookup) 161 { 162 Elf64_Addr *where, val; 163 Elf32_Addr *where32, val32; 164 Elf_Addr addr; 165 Elf_Addr addend; 166 Elf_Size rtype, symidx; 167 const Elf_Rel *rel; 168 const Elf_Rela *rela; 169 int error; 170 171 switch (type) { 172 case ELF_RELOC_REL: 173 rel = (const Elf_Rel *)data; 174 where = (Elf_Addr *) (relocbase + rel->r_offset); 175 rtype = ELF_R_TYPE(rel->r_info); 176 symidx = ELF_R_SYM(rel->r_info); 177 /* Addend is 32 bit on 32 bit relocs */ 178 switch (rtype) { 179 case R_X86_64_PC32: 180 case R_X86_64_32S: 181 addend = *(Elf32_Addr *)where; 182 break; 183 default: 184 addend = *where; 185 break; 186 } 187 break; 188 case ELF_RELOC_RELA: 189 rela = (const Elf_Rela *)data; 190 where = (Elf_Addr *) (relocbase + rela->r_offset); 191 addend = rela->r_addend; 192 rtype = ELF_R_TYPE(rela->r_info); 193 symidx = ELF_R_SYM(rela->r_info); 194 break; 195 default: 196 panic("unknown reloc type %d\n", type); 197 } 198 199 switch (rtype) { 200 201 case R_X86_64_NONE: /* none */ 202 break; 203 204 case R_X86_64_64: /* S + A */ 205 error = lookup(lf, symidx, 1, &addr); 206 val = addr + addend; 207 if (error != 0) 208 return -1; 209 if (*where != val) 210 *where = val; 211 break; 212 213 case R_X86_64_PC32: /* S + A - P */ 214 error = lookup(lf, symidx, 1, &addr); 215 where32 = (Elf32_Addr *)where; 216 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 217 if (error != 0) 218 return -1; 219 if (*where32 != val32) 220 *where32 = val32; 221 break; 222 223 case R_X86_64_32S: /* S + A sign extend */ 224 error = lookup(lf, symidx, 1, &addr); 225 val32 = (Elf32_Addr)(addr + addend); 226 where32 = (Elf32_Addr *)where; 227 if (error != 0) 228 return -1; 229 if (*where32 != val32) 230 *where32 = val32; 231 break; 232 233 case R_X86_64_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_X86_64_GLOB_DAT: /* S */ 243 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 244 error = lookup(lf, symidx, 1, &addr); 245 if (error != 0) 246 return -1; 247 if (*where != addr) 248 *where = addr; 249 break; 250 251 case R_X86_64_RELATIVE: /* B + A */ 252 addr = relocbase + addend; 253 val = addr; 254 if (*where != val) 255 *where = val; 256 break; 257 258 default: 259 printf("kldload: unexpected relocation type %ld\n", 260 rtype); 261 return -1; 262 } 263 return(0); 264 } 265 266 int 267 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 268 elf_lookup_fn lookup) 269 { 270 271 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 272 } 273 274 int 275 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 276 int type, elf_lookup_fn lookup) 277 { 278 279 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 280 } 281 282 int 283 elf_cpu_load_file(linker_file_t lf __unused) 284 { 285 286 return (0); 287 } 288 289 int 290 elf_cpu_unload_file(linker_file_t lf __unused) 291 { 292 293 return (0); 294 }
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