Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/elf64_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 * $FreeBSD$ 28 */ 29 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/systm.h> 33 #include <sys/elf.h> 34 #include <sys/exec.h> 35 #include <sys/imgact.h> 36 #include <sys/malloc.h> 37 #include <sys/proc.h> 38 #include <sys/namei.h> 39 #include <sys/fcntl.h> 40 #include <sys/reg.h> 41 #include <sys/sysent.h> 42 #include <sys/imgact_elf.h> 43 #include <sys/jail.h> 44 #include <sys/smp.h> 45 #include <sys/syscall.h> 46 #include <sys/signalvar.h> 47 #include <sys/vnode.h> 48 #include <sys/linker.h> 49 50 #include <vm/vm.h> 51 #include <vm/vm_param.h> 52 #include <vm/pmap.h> 53 #include <vm/vm_map.h> 54 55 #include <machine/altivec.h> 56 #include <machine/cpu.h> 57 #include <machine/fpu.h> 58 #include <machine/elf.h> 59 #include <machine/md_var.h> 60 61 #include <powerpc/powerpc/elf_common.c> 62 63 static void exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 64 uintptr_t stack); 65 66 struct sysentvec elf64_freebsd_sysvec_v1 = { 67 .sv_size = SYS_MAXSYSCALL, 68 .sv_table = sysent, 69 .sv_fixup = __elfN(freebsd_fixup), 70 .sv_sendsig = sendsig, 71 .sv_sigcode = sigcode64, 72 .sv_szsigcode = &szsigcode64, 73 .sv_name = "FreeBSD ELF64", 74 .sv_coredump = __elfN(coredump), 75 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 76 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 77 .sv_elf_core_prepare_notes = __elfN(prepare_notes), 78 .sv_imgact_try = NULL, 79 .sv_minsigstksz = MINSIGSTKSZ, 80 .sv_minuser = VM_MIN_ADDRESS, 81 .sv_maxuser = VM_MAXUSER_ADDRESS, 82 .sv_usrstack = USRSTACK, 83 .sv_psstrings = PS_STRINGS, 84 .sv_psstringssz = sizeof(struct ps_strings), 85 .sv_stackprot = VM_PROT_ALL, 86 .sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs), 87 .sv_copyout_strings = exec_copyout_strings, 88 .sv_setregs = exec_setregs_funcdesc, 89 .sv_fixlimit = NULL, 90 .sv_maxssiz = NULL, 91 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_ASLR | 92 SV_TIMEKEEP | SV_RNG_SEED_VER, 93 .sv_set_syscall_retval = cpu_set_syscall_retval, 94 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 95 .sv_syscallnames = syscallnames, 96 .sv_shared_page_base = SHAREDPAGE, 97 .sv_shared_page_len = PAGE_SIZE, 98 .sv_schedtail = NULL, 99 .sv_thread_detach = NULL, 100 .sv_trap = NULL, 101 .sv_hwcap = &cpu_features, 102 .sv_hwcap2 = &cpu_features2, 103 .sv_onexec_old = exec_onexec_old, 104 .sv_onexit = exit_onexit, 105 .sv_regset_begin = SET_BEGIN(__elfN(regset)), 106 .sv_regset_end = SET_LIMIT(__elfN(regset)), 107 }; 108 109 struct sysentvec elf64_freebsd_sysvec_v2 = { 110 .sv_size = SYS_MAXSYSCALL, 111 .sv_table = sysent, 112 .sv_fixup = __elfN(freebsd_fixup), 113 .sv_sendsig = sendsig, 114 .sv_sigcode = sigcode64, /* Fixed up in ppc64_init_sysvecs(). */ 115 .sv_szsigcode = &szsigcode64, 116 .sv_name = "FreeBSD ELF64 V2", 117 .sv_coredump = __elfN(coredump), 118 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 119 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 120 .sv_elf_core_prepare_notes = __elfN(prepare_notes), 121 .sv_imgact_try = NULL, 122 .sv_minsigstksz = MINSIGSTKSZ, 123 .sv_minuser = VM_MIN_ADDRESS, 124 .sv_maxuser = VM_MAXUSER_ADDRESS, 125 .sv_usrstack = USRSTACK, 126 .sv_psstrings = PS_STRINGS, 127 .sv_psstringssz = sizeof(struct ps_strings), 128 .sv_stackprot = VM_PROT_ALL, 129 .sv_copyout_auxargs = __elfN(powerpc_copyout_auxargs), 130 .sv_copyout_strings = exec_copyout_strings, 131 .sv_setregs = exec_setregs, 132 .sv_fixlimit = NULL, 133 .sv_maxssiz = NULL, 134 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | 135 SV_TIMEKEEP | SV_RNG_SEED_VER, 136 .sv_set_syscall_retval = cpu_set_syscall_retval, 137 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 138 .sv_syscallnames = syscallnames, 139 .sv_shared_page_base = SHAREDPAGE, 140 .sv_shared_page_len = PAGE_SIZE, 141 .sv_schedtail = NULL, 142 .sv_thread_detach = NULL, 143 .sv_trap = NULL, 144 .sv_hwcap = &cpu_features, 145 .sv_hwcap2 = &cpu_features2, 146 .sv_onexec_old = exec_onexec_old, 147 .sv_onexit = exit_onexit, 148 .sv_regset_begin = SET_BEGIN(__elfN(regset)), 149 .sv_regset_end = SET_LIMIT(__elfN(regset)), 150 }; 151 152 static boolean_t ppc64_elfv1_header_match(struct image_params *params, 153 int32_t *, uint32_t *); 154 static boolean_t ppc64_elfv2_header_match(struct image_params *params, 155 int32_t *, uint32_t *); 156 157 static Elf64_Brandinfo freebsd_brand_info_elfv1 = { 158 .brand = ELFOSABI_FREEBSD, 159 .machine = EM_PPC64, 160 .compat_3_brand = "FreeBSD", 161 .emul_path = NULL, 162 .interp_path = "/libexec/ld-elf.so.1", 163 .sysvec = &elf64_freebsd_sysvec_v1, 164 .interp_newpath = NULL, 165 .brand_note = &elf64_freebsd_brandnote, 166 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 167 .header_supported = &ppc64_elfv1_header_match 168 }; 169 170 SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY, 171 (sysinit_cfunc_t) elf64_insert_brand_entry, 172 &freebsd_brand_info_elfv1); 173 174 static Elf64_Brandinfo freebsd_brand_info_elfv2 = { 175 .brand = ELFOSABI_FREEBSD, 176 .machine = EM_PPC64, 177 .compat_3_brand = "FreeBSD", 178 .emul_path = NULL, 179 .interp_path = "/libexec/ld-elf.so.1", 180 .sysvec = &elf64_freebsd_sysvec_v2, 181 .interp_newpath = NULL, 182 .brand_note = &elf64_freebsd_brandnote, 183 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 184 .header_supported = &ppc64_elfv2_header_match 185 }; 186 187 SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY, 188 (sysinit_cfunc_t) elf64_insert_brand_entry, 189 &freebsd_brand_info_elfv2); 190 191 static Elf64_Brandinfo freebsd_brand_oinfo = { 192 .brand = ELFOSABI_FREEBSD, 193 .machine = EM_PPC64, 194 .compat_3_brand = "FreeBSD", 195 .emul_path = NULL, 196 .interp_path = "/usr/libexec/ld-elf.so.1", 197 .sysvec = &elf64_freebsd_sysvec_v1, 198 .interp_newpath = NULL, 199 .brand_note = &elf64_freebsd_brandnote, 200 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 201 .header_supported = &ppc64_elfv1_header_match 202 }; 203 204 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 205 (sysinit_cfunc_t) elf64_insert_brand_entry, 206 &freebsd_brand_oinfo); 207 208 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 209 210 static void 211 ppc64_init_sysvecs(void *arg) 212 { 213 exec_sysvec_init(&elf64_freebsd_sysvec_v2); 214 exec_sysvec_init_secondary(&elf64_freebsd_sysvec_v2, 215 &elf64_freebsd_sysvec_v1); 216 /* 217 * Adjust elfv2 sigcode after elfv1 sysvec is initialized. 218 * exec_sysvec_init_secondary() assumes secondary sysvecs use 219 * identical signal code, and skips allocating a second copy. 220 * Since the ELFv2 trampoline is a strict subset of the ELFv1 code, 221 * we can work around this by adjusting the offset. This also 222 * avoids two copies of the trampoline code being allocated! 223 */ 224 elf64_freebsd_sysvec_v2.sv_sigcode_offset += 225 (uintptr_t)sigcode64_elfv2 - (uintptr_t)&sigcode64; 226 elf64_freebsd_sysvec_v2.sv_szsigcode = &szsigcode64_elfv2; 227 } 228 SYSINIT(elf64_sysvec, SI_SUB_EXEC, SI_ORDER_ANY, ppc64_init_sysvecs, NULL); 229 230 static boolean_t 231 ppc64_elfv1_header_match(struct image_params *params, int32_t *osrel __unused, 232 uint32_t *fctl0 __unused) 233 { 234 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 235 int abi = (hdr->e_flags & 3); 236 237 return (abi == 0 || abi == 1); 238 } 239 240 static boolean_t 241 ppc64_elfv2_header_match(struct image_params *params, int32_t *osrel __unused, 242 uint32_t *fctl0 __unused) 243 { 244 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 245 int abi = (hdr->e_flags & 3); 246 247 return (abi == 2); 248 } 249 250 static void 251 exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 252 uintptr_t stack) 253 { 254 struct trapframe *tf; 255 register_t entry_desc[3]; 256 257 tf = trapframe(td); 258 exec_setregs(td, imgp, stack); 259 260 /* 261 * For 64-bit ELFv1, we need to disentangle the function 262 * descriptor 263 * 264 * 0. entry point 265 * 1. TOC value (r2) 266 * 2. Environment pointer (r11) 267 */ 268 269 (void)copyin((void *)imgp->entry_addr, entry_desc, 270 sizeof(entry_desc)); 271 tf->srr0 = entry_desc[0] + imgp->reloc_base; 272 tf->fixreg[2] = entry_desc[1] + imgp->reloc_base; 273 tf->fixreg[11] = entry_desc[2] + imgp->reloc_base; 274 } 275 276 void 277 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 278 { 279 size_t len; 280 struct pcb *pcb; 281 uint64_t vshr[32]; 282 uint64_t *vsr_dw1; 283 int vsr_idx; 284 285 len = 0; 286 pcb = td->td_pcb; 287 288 if (pcb->pcb_flags & PCB_VEC) { 289 save_vec_nodrop(td); 290 if (dst != NULL) { 291 len += elf64_populate_note(NT_PPC_VMX, 292 &pcb->pcb_vec, (char *)dst + len, 293 sizeof(pcb->pcb_vec), NULL); 294 } else 295 len += elf64_populate_note(NT_PPC_VMX, NULL, NULL, 296 sizeof(pcb->pcb_vec), NULL); 297 } 298 299 if (pcb->pcb_flags & PCB_VSX) { 300 save_fpu_nodrop(td); 301 if (dst != NULL) { 302 /* 303 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 304 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 305 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 306 */ 307 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 308 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 309 vshr[vsr_idx] = *vsr_dw1; 310 } 311 len += elf64_populate_note(NT_PPC_VSX, 312 vshr, (char *)dst + len, 313 sizeof(vshr), NULL); 314 } else 315 len += elf64_populate_note(NT_PPC_VSX, NULL, NULL, 316 sizeof(vshr), NULL); 317 } 318 319 *off = len; 320 } 321 322 bool 323 elf_is_ifunc_reloc(Elf_Size r_info) 324 { 325 326 return (ELF_R_TYPE(r_info) == R_PPC_IRELATIVE); 327 } 328 329 /* Process one elf relocation with addend. */ 330 static int 331 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 332 int type, int local, elf_lookup_fn lookup) 333 { 334 Elf_Addr *where; 335 Elf_Addr addr; 336 Elf_Addr addend, val; 337 Elf_Word rtype, symidx; 338 const Elf_Rela *rela; 339 int error; 340 341 switch (type) { 342 case ELF_RELOC_REL: 343 panic("PPC only supports RELA relocations"); 344 break; 345 case ELF_RELOC_RELA: 346 rela = (const Elf_Rela *)data; 347 where = (Elf_Addr *) (relocbase + rela->r_offset); 348 addend = rela->r_addend; 349 rtype = ELF_R_TYPE(rela->r_info); 350 symidx = ELF_R_SYM(rela->r_info); 351 break; 352 default: 353 panic("elf_reloc: unknown relocation mode %d\n", type); 354 } 355 356 switch (rtype) { 357 case R_PPC_NONE: 358 break; 359 360 case R_PPC64_ADDR64: /* doubleword64 S + A */ 361 error = lookup(lf, symidx, 1, &addr); 362 if (error != 0) 363 return (-1); 364 addr += addend; 365 *where = addr; 366 break; 367 368 case R_PPC_RELATIVE: /* doubleword64 B + A */ 369 *where = elf_relocaddr(lf, relocbase + addend); 370 break; 371 372 case R_PPC_JMP_SLOT: /* function descriptor copy */ 373 lookup(lf, symidx, 1, &addr); 374 #if !defined(_CALL_ELF) || _CALL_ELF == 1 375 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr)); 376 #else 377 *where = addr; 378 #endif 379 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory"); 380 break; 381 382 case R_PPC_IRELATIVE: 383 addr = relocbase + addend; 384 val = ((Elf64_Addr (*)(void))addr)(); 385 if (*where != val) 386 *where = val; 387 break; 388 389 default: 390 printf("kldload: unexpected relocation type %d, " 391 "symbol index %d\n", (int)rtype, symidx); 392 return (-1); 393 } 394 return (0); 395 } 396 397 void 398 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 399 { 400 Elf_Rela *rela = NULL, *relalim; 401 Elf_Addr relasz = 0; 402 Elf_Addr *where; 403 404 /* 405 * Extract the rela/relasz values from the dynamic section 406 */ 407 for (; dynp->d_tag != DT_NULL; dynp++) { 408 switch (dynp->d_tag) { 409 case DT_RELA: 410 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 411 break; 412 case DT_RELASZ: 413 relasz = dynp->d_un.d_val; 414 break; 415 } 416 } 417 418 /* 419 * Relocate these values 420 */ 421 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 422 for (; rela < relalim; rela++) { 423 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 424 continue; 425 where = (Elf_Addr *)(relocbase + rela->r_offset); 426 *where = (Elf_Addr)(relocbase + rela->r_addend); 427 } 428 } 429 430 int 431 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 432 elf_lookup_fn lookup) 433 { 434 435 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 436 } 437 438 int 439 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 440 int type, elf_lookup_fn lookup) 441 { 442 443 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 444 } 445 446 int 447 elf_cpu_load_file(linker_file_t lf) 448 { 449 /* Only sync the cache for non-kernel modules */ 450 if (lf->id != 1) 451 __syncicache(lf->address, lf->size); 452 return (0); 453 } 454 455 int 456 elf_cpu_unload_file(linker_file_t lf __unused) 457 { 458 459 return (0); 460 } 461 462 int 463 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused) 464 { 465 466 return (0); 467 }
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