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_errsize = 0, 62 .sv_errtbl = NULL, 63 .sv_transtrap = NULL, 64 .sv_fixup = __elfN(freebsd_fixup), 65 .sv_sendsig = sendsig, 66 .sv_sigcode = sigcode64, 67 .sv_szsigcode = &szsigcode64, 68 .sv_name = "FreeBSD ELF64", 69 .sv_coredump = __elfN(coredump), 70 .sv_imgact_try = NULL, 71 .sv_minsigstksz = MINSIGSTKSZ, 72 .sv_pagesize = PAGE_SIZE, 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_errsize = 0, 100 .sv_errtbl = NULL, 101 .sv_transtrap = NULL, 102 .sv_fixup = __elfN(freebsd_fixup), 103 .sv_sendsig = sendsig, 104 .sv_sigcode = sigcode64_elfv2, 105 .sv_szsigcode = &szsigcode64_elfv2, 106 .sv_name = "FreeBSD ELF64 V2", 107 .sv_coredump = __elfN(coredump), 108 .sv_imgact_try = NULL, 109 .sv_minsigstksz = MINSIGSTKSZ, 110 .sv_pagesize = PAGE_SIZE, 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 .sv_trap = NULL, 129 .sv_hwcap = &cpu_features, 130 .sv_hwcap2 = &cpu_features2, 131 }; 132 INIT_SYSENTVEC(elf64_sysvec_v2, &elf64_freebsd_sysvec_v2); 133 134 static boolean_t ppc64_elfv1_header_match(struct image_params *params); 135 static boolean_t ppc64_elfv2_header_match(struct image_params *params); 136 137 static Elf64_Brandinfo freebsd_brand_info_elfv1 = { 138 .brand = ELFOSABI_FREEBSD, 139 .machine = EM_PPC64, 140 .compat_3_brand = "FreeBSD", 141 .emul_path = NULL, 142 .interp_path = "/libexec/ld-elf.so.1", 143 .sysvec = &elf64_freebsd_sysvec_v1, 144 .interp_newpath = NULL, 145 .brand_note = &elf64_freebsd_brandnote, 146 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 147 .header_supported = &ppc64_elfv1_header_match 148 }; 149 150 SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY, 151 (sysinit_cfunc_t) elf64_insert_brand_entry, 152 &freebsd_brand_info_elfv1); 153 154 static Elf64_Brandinfo freebsd_brand_info_elfv2 = { 155 .brand = ELFOSABI_FREEBSD, 156 .machine = EM_PPC64, 157 .compat_3_brand = "FreeBSD", 158 .emul_path = NULL, 159 .interp_path = "/libexec/ld-elf.so.1", 160 .sysvec = &elf64_freebsd_sysvec_v2, 161 .interp_newpath = NULL, 162 .brand_note = &elf64_freebsd_brandnote, 163 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 164 .header_supported = &ppc64_elfv2_header_match 165 }; 166 167 SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY, 168 (sysinit_cfunc_t) elf64_insert_brand_entry, 169 &freebsd_brand_info_elfv2); 170 171 static Elf64_Brandinfo freebsd_brand_oinfo = { 172 .brand = ELFOSABI_FREEBSD, 173 .machine = EM_PPC64, 174 .compat_3_brand = "FreeBSD", 175 .emul_path = NULL, 176 .interp_path = "/usr/libexec/ld-elf.so.1", 177 .sysvec = &elf64_freebsd_sysvec_v1, 178 .interp_newpath = NULL, 179 .brand_note = &elf64_freebsd_brandnote, 180 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 181 .header_supported = &ppc64_elfv1_header_match 182 }; 183 184 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 185 (sysinit_cfunc_t) elf64_insert_brand_entry, 186 &freebsd_brand_oinfo); 187 188 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 189 190 static boolean_t 191 ppc64_elfv1_header_match(struct image_params *params) 192 { 193 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 194 int abi = (hdr->e_flags & 3); 195 196 return (abi == 0 || abi == 1); 197 } 198 199 static boolean_t 200 ppc64_elfv2_header_match(struct image_params *params) 201 { 202 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 203 int abi = (hdr->e_flags & 3); 204 205 return (abi == 2); 206 } 207 208 static void 209 exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 210 u_long stack) 211 { 212 struct trapframe *tf; 213 register_t entry_desc[3]; 214 215 tf = trapframe(td); 216 exec_setregs(td, imgp, stack); 217 218 /* 219 * For 64-bit ELFv1, we need to disentangle the function 220 * descriptor 221 * 222 * 0. entry point 223 * 1. TOC value (r2) 224 * 2. Environment pointer (r11) 225 */ 226 227 (void)copyin((void *)imgp->entry_addr, entry_desc, 228 sizeof(entry_desc)); 229 tf->srr0 = entry_desc[0] + imgp->reloc_base; 230 tf->fixreg[2] = entry_desc[1] + imgp->reloc_base; 231 tf->fixreg[11] = entry_desc[2] + imgp->reloc_base; 232 } 233 234 void 235 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 236 { 237 size_t len; 238 struct pcb *pcb; 239 uint64_t vshr[32]; 240 uint64_t *vsr_dw1; 241 int vsr_idx; 242 243 len = 0; 244 pcb = td->td_pcb; 245 246 if (pcb->pcb_flags & PCB_VEC) { 247 save_vec_nodrop(td); 248 if (dst != NULL) { 249 len += elf64_populate_note(NT_PPC_VMX, 250 &pcb->pcb_vec, (char *)dst + len, 251 sizeof(pcb->pcb_vec), NULL); 252 } else 253 len += elf64_populate_note(NT_PPC_VMX, NULL, NULL, 254 sizeof(pcb->pcb_vec), NULL); 255 } 256 257 if (pcb->pcb_flags & PCB_VSX) { 258 save_fpu_nodrop(td); 259 if (dst != NULL) { 260 /* 261 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 262 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 263 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 264 */ 265 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 266 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 267 vshr[vsr_idx] = *vsr_dw1; 268 } 269 len += elf64_populate_note(NT_PPC_VSX, 270 vshr, (char *)dst + len, 271 sizeof(vshr), NULL); 272 } else 273 len += elf64_populate_note(NT_PPC_VSX, NULL, NULL, 274 sizeof(vshr), NULL); 275 } 276 277 *off = len; 278 } 279 280 bool 281 elf_is_ifunc_reloc(Elf_Size r_info __unused) 282 { 283 284 return (false); 285 } 286 287 /* Process one elf relocation with addend. */ 288 static int 289 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 290 int type, int local, elf_lookup_fn lookup) 291 { 292 Elf_Addr *where; 293 Elf_Addr addr; 294 Elf_Addr addend; 295 Elf_Word rtype, symidx; 296 const Elf_Rela *rela; 297 int error; 298 299 switch (type) { 300 case ELF_RELOC_REL: 301 panic("PPC only supports RELA relocations"); 302 break; 303 case ELF_RELOC_RELA: 304 rela = (const Elf_Rela *)data; 305 where = (Elf_Addr *) (relocbase + rela->r_offset); 306 addend = rela->r_addend; 307 rtype = ELF_R_TYPE(rela->r_info); 308 symidx = ELF_R_SYM(rela->r_info); 309 break; 310 default: 311 panic("elf_reloc: unknown relocation mode %d\n", type); 312 } 313 314 switch (rtype) { 315 316 case R_PPC_NONE: 317 break; 318 319 case R_PPC64_ADDR64: /* doubleword64 S + A */ 320 error = lookup(lf, symidx, 1, &addr); 321 if (error != 0) 322 return -1; 323 addr += addend; 324 *where = addr; 325 break; 326 327 case R_PPC_RELATIVE: /* doubleword64 B + A */ 328 *where = elf_relocaddr(lf, relocbase + addend); 329 break; 330 331 case R_PPC_JMP_SLOT: /* function descriptor copy */ 332 lookup(lf, symidx, 1, &addr); 333 #if !defined(_CALL_ELF) || _CALL_ELF == 1 334 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr)); 335 #else 336 *where = addr; 337 #endif 338 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory"); 339 break; 340 341 default: 342 printf("kldload: unexpected relocation type %d\n", 343 (int) rtype); 344 return -1; 345 } 346 return(0); 347 } 348 349 void 350 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 351 { 352 Elf_Rela *rela = NULL, *relalim; 353 Elf_Addr relasz = 0; 354 Elf_Addr *where; 355 356 /* 357 * Extract the rela/relasz values from the dynamic section 358 */ 359 for (; dynp->d_tag != DT_NULL; dynp++) { 360 switch (dynp->d_tag) { 361 case DT_RELA: 362 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 363 break; 364 case DT_RELASZ: 365 relasz = dynp->d_un.d_val; 366 break; 367 } 368 } 369 370 /* 371 * Relocate these values 372 */ 373 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 374 for (; rela < relalim; rela++) { 375 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 376 continue; 377 where = (Elf_Addr *)(relocbase + rela->r_offset); 378 *where = (Elf_Addr)(relocbase + rela->r_addend); 379 } 380 } 381 382 int 383 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 384 elf_lookup_fn lookup) 385 { 386 387 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 388 } 389 390 int 391 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 392 int type, elf_lookup_fn lookup) 393 { 394 395 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 396 } 397 398 int 399 elf_cpu_load_file(linker_file_t lf) 400 { 401 /* Only sync the cache for non-kernel modules */ 402 if (lf->id != 1) 403 __syncicache(lf->address, lf->size); 404 return (0); 405 } 406 407 int 408 elf_cpu_unload_file(linker_file_t lf __unused) 409 { 410 411 return (0); 412 } 413