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