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