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/10.3/sys/amd64/amd64/elf_machdep.c 294136 2016-01-16 07:56:49Z 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_sigsize = 0, 55 .sv_sigtbl = NULL, 56 .sv_errsize = 0, 57 .sv_errtbl = NULL, 58 .sv_transtrap = NULL, 59 .sv_fixup = __elfN(freebsd_fixup), 60 .sv_sendsig = sendsig, 61 .sv_sigcode = sigcode, 62 .sv_szsigcode = &szsigcode, 63 .sv_prepsyscall = NULL, 64 .sv_name = "FreeBSD ELF64", 65 .sv_coredump = __elfN(coredump), 66 .sv_imgact_try = NULL, 67 .sv_minsigstksz = MINSIGSTKSZ, 68 .sv_pagesize = PAGE_SIZE, 69 .sv_minuser = VM_MIN_ADDRESS, 70 .sv_maxuser = VM_MAXUSER_ADDRESS, 71 .sv_usrstack = USRSTACK, 72 .sv_psstrings = PS_STRINGS, 73 .sv_stackprot = VM_PROT_ALL, 74 .sv_copyout_strings = exec_copyout_strings, 75 .sv_setregs = exec_setregs, 76 .sv_fixlimit = NULL, 77 .sv_maxssiz = NULL, 78 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP, 79 .sv_set_syscall_retval = cpu_set_syscall_retval, 80 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 81 .sv_syscallnames = syscallnames, 82 .sv_shared_page_base = SHAREDPAGE, 83 .sv_shared_page_len = PAGE_SIZE, 84 .sv_schedtail = NULL, 85 .sv_thread_detach = NULL, 86 .sv_trap = NULL, 87 }; 88 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 89 90 static Elf64_Brandinfo freebsd_brand_info = { 91 .brand = ELFOSABI_FREEBSD, 92 .machine = EM_X86_64, 93 .compat_3_brand = "FreeBSD", 94 .emul_path = NULL, 95 .interp_path = "/libexec/ld-elf.so.1", 96 .sysvec = &elf64_freebsd_sysvec, 97 .interp_newpath = NULL, 98 .brand_note = &elf64_freebsd_brandnote, 99 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 100 }; 101 102 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 103 (sysinit_cfunc_t) elf64_insert_brand_entry, 104 &freebsd_brand_info); 105 106 static Elf64_Brandinfo freebsd_brand_oinfo = { 107 .brand = ELFOSABI_FREEBSD, 108 .machine = EM_X86_64, 109 .compat_3_brand = "FreeBSD", 110 .emul_path = NULL, 111 .interp_path = "/usr/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(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 119 (sysinit_cfunc_t) elf64_insert_brand_entry, 120 &freebsd_brand_oinfo); 121 122 static Elf64_Brandinfo kfreebsd_brand_info = { 123 .brand = ELFOSABI_FREEBSD, 124 .machine = EM_X86_64, 125 .compat_3_brand = "FreeBSD", 126 .emul_path = NULL, 127 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1", 128 .sysvec = &elf64_freebsd_sysvec, 129 .interp_newpath = NULL, 130 .brand_note = &elf64_kfreebsd_brandnote, 131 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 132 }; 133 134 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY, 135 (sysinit_cfunc_t) elf64_insert_brand_entry, 136 &kfreebsd_brand_info); 137 138 void 139 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 140 { 141 void *buf; 142 size_t len; 143 144 len = 0; 145 if (use_xsave) { 146 if (dst != NULL) { 147 fpugetregs(td); 148 len += elf64_populate_note(NT_X86_XSTATE, 149 get_pcb_user_save_td(td), dst, 150 cpu_max_ext_state_size, &buf); 151 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 152 xsave_mask; 153 } else 154 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL, 155 cpu_max_ext_state_size, NULL); 156 } 157 *off = len; 158 } 159 160 /* Process one elf relocation with addend. */ 161 static int 162 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 163 int type, int local, elf_lookup_fn lookup) 164 { 165 Elf64_Addr *where, val; 166 Elf32_Addr *where32, val32; 167 Elf_Addr addr; 168 Elf_Addr addend; 169 Elf_Size rtype, symidx; 170 const Elf_Rel *rel; 171 const Elf_Rela *rela; 172 int error; 173 174 switch (type) { 175 case ELF_RELOC_REL: 176 rel = (const Elf_Rel *)data; 177 where = (Elf_Addr *) (relocbase + rel->r_offset); 178 rtype = ELF_R_TYPE(rel->r_info); 179 symidx = ELF_R_SYM(rel->r_info); 180 /* Addend is 32 bit on 32 bit relocs */ 181 switch (rtype) { 182 case R_X86_64_PC32: 183 case R_X86_64_32S: 184 addend = *(Elf32_Addr *)where; 185 break; 186 default: 187 addend = *where; 188 break; 189 } 190 break; 191 case ELF_RELOC_RELA: 192 rela = (const Elf_Rela *)data; 193 where = (Elf_Addr *) (relocbase + rela->r_offset); 194 addend = rela->r_addend; 195 rtype = ELF_R_TYPE(rela->r_info); 196 symidx = ELF_R_SYM(rela->r_info); 197 break; 198 default: 199 panic("unknown reloc type %d\n", type); 200 } 201 202 switch (rtype) { 203 204 case R_X86_64_NONE: /* none */ 205 break; 206 207 case R_X86_64_64: /* S + A */ 208 error = lookup(lf, symidx, 1, &addr); 209 val = addr + addend; 210 if (error != 0) 211 return -1; 212 if (*where != val) 213 *where = val; 214 break; 215 216 case R_X86_64_PC32: /* S + A - P */ 217 error = lookup(lf, symidx, 1, &addr); 218 where32 = (Elf32_Addr *)where; 219 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where); 220 if (error != 0) 221 return -1; 222 if (*where32 != val32) 223 *where32 = val32; 224 break; 225 226 case R_X86_64_32S: /* S + A sign extend */ 227 error = lookup(lf, symidx, 1, &addr); 228 val32 = (Elf32_Addr)(addr + addend); 229 where32 = (Elf32_Addr *)where; 230 if (error != 0) 231 return -1; 232 if (*where32 != val32) 233 *where32 = val32; 234 break; 235 236 case R_X86_64_COPY: /* none */ 237 /* 238 * There shouldn't be copy relocations in kernel 239 * objects. 240 */ 241 printf("kldload: unexpected R_COPY relocation\n"); 242 return -1; 243 break; 244 245 case R_X86_64_GLOB_DAT: /* S */ 246 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */ 247 error = lookup(lf, symidx, 1, &addr); 248 if (error != 0) 249 return -1; 250 if (*where != addr) 251 *where = addr; 252 break; 253 254 case R_X86_64_RELATIVE: /* B + A */ 255 addr = relocbase + addend; 256 val = addr; 257 if (*where != val) 258 *where = val; 259 break; 260 261 default: 262 printf("kldload: unexpected relocation type %ld\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, 0, lookup)); 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, 1, lookup)); 283 } 284 285 int 286 elf_cpu_load_file(linker_file_t lf __unused) 287 { 288 289 return (0); 290 } 291 292 int 293 elf_cpu_unload_file(linker_file_t lf __unused) 294 { 295 296 return (0); 297 }
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