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/syscall.h> 42 #include <sys/signalvar.h> 43 #include <sys/vnode.h> 44 #include <sys/linker.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_param.h> 48 49 #include <machine/altivec.h> 50 #include <machine/cpu.h> 51 #include <machine/fpu.h> 52 #include <machine/elf.h> 53 #include <machine/md_var.h> 54 55 static void exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 56 u_long stack); 57 58 struct sysentvec elf64_freebsd_sysvec_v1 = { 59 .sv_size = SYS_MAXSYSCALL, 60 .sv_table = sysent, 61 .sv_mask = 0, 62 .sv_errsize = 0, 63 .sv_errtbl = NULL, 64 .sv_transtrap = NULL, 65 .sv_fixup = __elfN(freebsd_fixup), 66 .sv_sendsig = sendsig, 67 .sv_sigcode = sigcode64, 68 .sv_szsigcode = &szsigcode64, 69 .sv_name = "FreeBSD ELF64", 70 .sv_coredump = __elfN(coredump), 71 .sv_imgact_try = NULL, 72 .sv_minsigstksz = MINSIGSTKSZ, 73 .sv_minuser = VM_MIN_ADDRESS, 74 .sv_maxuser = VM_MAXUSER_ADDRESS, 75 .sv_usrstack = USRSTACK, 76 .sv_psstrings = PS_STRINGS, 77 .sv_stackprot = VM_PROT_ALL, 78 .sv_copyout_strings = exec_copyout_strings, 79 .sv_setregs = exec_setregs_funcdesc, 80 .sv_fixlimit = NULL, 81 .sv_maxssiz = NULL, 82 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_ASLR, 83 .sv_set_syscall_retval = cpu_set_syscall_retval, 84 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 85 .sv_syscallnames = syscallnames, 86 .sv_shared_page_base = SHAREDPAGE, 87 .sv_shared_page_len = PAGE_SIZE, 88 .sv_schedtail = NULL, 89 .sv_thread_detach = NULL, 90 .sv_trap = NULL, 91 .sv_hwcap = &cpu_features, 92 .sv_hwcap2 = &cpu_features2, 93 }; 94 INIT_SYSENTVEC(elf64_sysvec_v1, &elf64_freebsd_sysvec_v1); 95 96 struct sysentvec elf64_freebsd_sysvec_v2 = { 97 .sv_size = SYS_MAXSYSCALL, 98 .sv_table = sysent, 99 .sv_mask = 0, 100 .sv_errsize = 0, 101 .sv_errtbl = NULL, 102 .sv_transtrap = NULL, 103 .sv_fixup = __elfN(freebsd_fixup), 104 .sv_sendsig = sendsig, 105 .sv_sigcode = sigcode64_elfv2, 106 .sv_szsigcode = &szsigcode64_elfv2, 107 .sv_name = "FreeBSD ELF64 V2", 108 .sv_coredump = __elfN(coredump), 109 .sv_imgact_try = NULL, 110 .sv_minsigstksz = MINSIGSTKSZ, 111 .sv_minuser = VM_MIN_ADDRESS, 112 .sv_maxuser = VM_MAXUSER_ADDRESS, 113 .sv_usrstack = USRSTACK, 114 .sv_psstrings = PS_STRINGS, 115 .sv_stackprot = VM_PROT_ALL, 116 .sv_copyout_strings = exec_copyout_strings, 117 .sv_setregs = exec_setregs, 118 .sv_fixlimit = NULL, 119 .sv_maxssiz = NULL, 120 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP, 121 .sv_set_syscall_retval = cpu_set_syscall_retval, 122 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 123 .sv_syscallnames = syscallnames, 124 .sv_shared_page_base = SHAREDPAGE, 125 .sv_shared_page_len = PAGE_SIZE, 126 .sv_schedtail = NULL, 127 .sv_thread_detach = NULL, 128 }; 129 INIT_SYSENTVEC(elf64_sysvec_v2, &elf64_freebsd_sysvec_v2); 130 131 static boolean_t ppc64_elfv1_header_match(struct image_params *params); 132 static boolean_t ppc64_elfv2_header_match(struct image_params *params); 133 134 static Elf64_Brandinfo freebsd_brand_info_elfv1 = { 135 .brand = ELFOSABI_FREEBSD, 136 .machine = EM_PPC64, 137 .compat_3_brand = "FreeBSD", 138 .emul_path = NULL, 139 .interp_path = "/libexec/ld-elf.so.1", 140 .sysvec = &elf64_freebsd_sysvec_v1, 141 .interp_newpath = NULL, 142 .brand_note = &elf64_freebsd_brandnote, 143 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 144 .header_supported = &ppc64_elfv1_header_match 145 }; 146 147 SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY, 148 (sysinit_cfunc_t) elf64_insert_brand_entry, 149 &freebsd_brand_info_elfv1); 150 151 static Elf64_Brandinfo freebsd_brand_info_elfv2 = { 152 .brand = ELFOSABI_FREEBSD, 153 .machine = EM_PPC64, 154 .compat_3_brand = "FreeBSD", 155 .emul_path = NULL, 156 .interp_path = "/libexec/ld-elf.so.1", 157 .sysvec = &elf64_freebsd_sysvec_v2, 158 .interp_newpath = NULL, 159 .brand_note = &elf64_freebsd_brandnote, 160 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 161 .header_supported = &ppc64_elfv2_header_match 162 }; 163 164 SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY, 165 (sysinit_cfunc_t) elf64_insert_brand_entry, 166 &freebsd_brand_info_elfv2); 167 168 static Elf64_Brandinfo freebsd_brand_oinfo = { 169 .brand = ELFOSABI_FREEBSD, 170 .machine = EM_PPC64, 171 .compat_3_brand = "FreeBSD", 172 .emul_path = NULL, 173 .interp_path = "/usr/libexec/ld-elf.so.1", 174 .sysvec = &elf64_freebsd_sysvec_v1, 175 .interp_newpath = NULL, 176 .brand_note = &elf64_freebsd_brandnote, 177 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 178 .header_supported = &ppc64_elfv1_header_match 179 }; 180 181 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 182 (sysinit_cfunc_t) elf64_insert_brand_entry, 183 &freebsd_brand_oinfo); 184 185 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 186 187 static boolean_t 188 ppc64_elfv1_header_match(struct image_params *params) 189 { 190 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 191 int abi = (hdr->e_flags & 3); 192 193 return (abi == 0 || abi == 1); 194 } 195 196 static boolean_t 197 ppc64_elfv2_header_match(struct image_params *params) 198 { 199 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 200 int abi = (hdr->e_flags & 3); 201 202 return (abi == 2); 203 } 204 205 static void 206 exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 207 u_long stack) 208 { 209 struct trapframe *tf; 210 register_t entry_desc[3]; 211 212 tf = trapframe(td); 213 exec_setregs(td, imgp, stack); 214 215 /* 216 * For 64-bit ELFv1, we need to disentangle the function 217 * descriptor 218 * 219 * 0. entry point 220 * 1. TOC value (r2) 221 * 2. Environment pointer (r11) 222 */ 223 224 (void)copyin((void *)imgp->entry_addr, entry_desc, 225 sizeof(entry_desc)); 226 tf->srr0 = entry_desc[0] + imgp->reloc_base; 227 tf->fixreg[2] = entry_desc[1] + imgp->reloc_base; 228 tf->fixreg[11] = entry_desc[2] + imgp->reloc_base; 229 } 230 231 void 232 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 233 { 234 size_t len; 235 struct pcb *pcb; 236 uint64_t vshr[32]; 237 uint64_t *vsr_dw1; 238 int vsr_idx; 239 240 len = 0; 241 pcb = td->td_pcb; 242 243 if (pcb->pcb_flags & PCB_VEC) { 244 save_vec_nodrop(td); 245 if (dst != NULL) { 246 len += elf64_populate_note(NT_PPC_VMX, 247 &pcb->pcb_vec, (char *)dst + len, 248 sizeof(pcb->pcb_vec), NULL); 249 } else 250 len += elf64_populate_note(NT_PPC_VMX, NULL, NULL, 251 sizeof(pcb->pcb_vec), NULL); 252 } 253 254 if (pcb->pcb_flags & PCB_VSX) { 255 save_fpu_nodrop(td); 256 if (dst != NULL) { 257 /* 258 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 259 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 260 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 261 */ 262 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 263 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 264 vshr[vsr_idx] = *vsr_dw1; 265 } 266 len += elf64_populate_note(NT_PPC_VSX, 267 vshr, (char *)dst + len, 268 sizeof(vshr), NULL); 269 } else 270 len += elf64_populate_note(NT_PPC_VSX, NULL, NULL, 271 sizeof(vshr), NULL); 272 } 273 274 *off = len; 275 } 276 277 bool 278 elf_is_ifunc_reloc(Elf_Size r_info __unused) 279 { 280 281 return (false); 282 } 283 284 /* Process one elf relocation with addend. */ 285 static int 286 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 287 int type, int local, elf_lookup_fn lookup) 288 { 289 Elf_Addr *where; 290 Elf_Addr addr; 291 Elf_Addr addend; 292 Elf_Word rtype, symidx; 293 const Elf_Rela *rela; 294 int error; 295 296 switch (type) { 297 case ELF_RELOC_REL: 298 panic("PPC only supports RELA relocations"); 299 break; 300 case ELF_RELOC_RELA: 301 rela = (const Elf_Rela *)data; 302 where = (Elf_Addr *) (relocbase + rela->r_offset); 303 addend = rela->r_addend; 304 rtype = ELF_R_TYPE(rela->r_info); 305 symidx = ELF_R_SYM(rela->r_info); 306 break; 307 default: 308 panic("elf_reloc: unknown relocation mode %d\n", type); 309 } 310 311 switch (rtype) { 312 313 case R_PPC_NONE: 314 break; 315 316 case R_PPC64_ADDR64: /* doubleword64 S + A */ 317 error = lookup(lf, symidx, 1, &addr); 318 if (error != 0) 319 return -1; 320 addr += addend; 321 *where = addr; 322 break; 323 324 case R_PPC_RELATIVE: /* doubleword64 B + A */ 325 *where = elf_relocaddr(lf, relocbase + addend); 326 break; 327 328 case R_PPC_JMP_SLOT: /* function descriptor copy */ 329 lookup(lf, symidx, 1, &addr); 330 #if !defined(_CALL_ELF) || _CALL_ELF == 1 331 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr)); 332 #else 333 memcpy(where, (Elf_Addr *)addr, sizeof(Elf_Addr)); 334 #endif 335 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory"); 336 break; 337 338 default: 339 printf("kldload: unexpected relocation type %d\n", 340 (int) rtype); 341 return -1; 342 } 343 return(0); 344 } 345 346 void 347 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 348 { 349 Elf_Rela *rela = NULL, *relalim; 350 Elf_Addr relasz = 0; 351 Elf_Addr *where; 352 353 /* 354 * Extract the rela/relasz values from the dynamic section 355 */ 356 for (; dynp->d_tag != DT_NULL; dynp++) { 357 switch (dynp->d_tag) { 358 case DT_RELA: 359 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 360 break; 361 case DT_RELASZ: 362 relasz = dynp->d_un.d_val; 363 break; 364 } 365 } 366 367 /* 368 * Relocate these values 369 */ 370 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 371 for (; rela < relalim; rela++) { 372 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 373 continue; 374 where = (Elf_Addr *)(relocbase + rela->r_offset); 375 *where = (Elf_Addr)(relocbase + rela->r_addend); 376 } 377 } 378 379 int 380 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 381 elf_lookup_fn lookup) 382 { 383 384 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 385 } 386 387 int 388 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 389 int type, elf_lookup_fn lookup) 390 { 391 392 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 393 } 394 395 int 396 elf_cpu_load_file(linker_file_t lf) 397 { 398 /* Only sync the cache for non-kernel modules */ 399 if (lf->id != 1) 400 __syncicache(lf->address, lf->size); 401 return (0); 402 } 403 404 int 405 elf_cpu_unload_file(linker_file_t lf __unused) 406 { 407 408 return (0); 409 }
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