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_minuser = VM_MIN_ADDRESS, 73 .sv_maxuser = VM_MAXUSER_ADDRESS, 74 .sv_usrstack = USRSTACK, 75 .sv_psstrings = PS_STRINGS, 76 .sv_stackprot = VM_PROT_ALL, 77 .sv_copyout_strings = exec_copyout_strings, 78 .sv_setregs = exec_setregs_funcdesc, 79 .sv_fixlimit = NULL, 80 .sv_maxssiz = NULL, 81 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_ASLR, 82 .sv_set_syscall_retval = cpu_set_syscall_retval, 83 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 84 .sv_syscallnames = syscallnames, 85 .sv_shared_page_base = SHAREDPAGE, 86 .sv_shared_page_len = PAGE_SIZE, 87 .sv_schedtail = NULL, 88 .sv_thread_detach = NULL, 89 .sv_trap = NULL, 90 .sv_hwcap = &cpu_features, 91 .sv_hwcap2 = &cpu_features2, 92 }; 93 INIT_SYSENTVEC(elf64_sysvec_v1, &elf64_freebsd_sysvec_v1); 94 95 struct sysentvec elf64_freebsd_sysvec_v2 = { 96 .sv_size = SYS_MAXSYSCALL, 97 .sv_table = sysent, 98 .sv_errsize = 0, 99 .sv_errtbl = NULL, 100 .sv_transtrap = NULL, 101 .sv_fixup = __elfN(freebsd_fixup), 102 .sv_sendsig = sendsig, 103 .sv_sigcode = sigcode64_elfv2, 104 .sv_szsigcode = &szsigcode64_elfv2, 105 .sv_name = "FreeBSD ELF64 V2", 106 .sv_coredump = __elfN(coredump), 107 .sv_imgact_try = NULL, 108 .sv_minsigstksz = MINSIGSTKSZ, 109 .sv_minuser = VM_MIN_ADDRESS, 110 .sv_maxuser = VM_MAXUSER_ADDRESS, 111 .sv_usrstack = USRSTACK, 112 .sv_psstrings = PS_STRINGS, 113 .sv_stackprot = VM_PROT_ALL, 114 .sv_copyout_strings = exec_copyout_strings, 115 .sv_setregs = exec_setregs, 116 .sv_fixlimit = NULL, 117 .sv_maxssiz = NULL, 118 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP, 119 .sv_set_syscall_retval = cpu_set_syscall_retval, 120 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 121 .sv_syscallnames = syscallnames, 122 .sv_shared_page_base = SHAREDPAGE, 123 .sv_shared_page_len = PAGE_SIZE, 124 .sv_schedtail = NULL, 125 .sv_thread_detach = NULL, 126 .sv_trap = NULL, 127 .sv_hwcap = &cpu_features, 128 .sv_hwcap2 = &cpu_features2, 129 }; 130 INIT_SYSENTVEC(elf64_sysvec_v2, &elf64_freebsd_sysvec_v2); 131 132 static boolean_t ppc64_elfv1_header_match(struct image_params *params); 133 static boolean_t ppc64_elfv2_header_match(struct image_params *params); 134 135 static Elf64_Brandinfo freebsd_brand_info_elfv1 = { 136 .brand = ELFOSABI_FREEBSD, 137 .machine = EM_PPC64, 138 .compat_3_brand = "FreeBSD", 139 .emul_path = NULL, 140 .interp_path = "/libexec/ld-elf.so.1", 141 .sysvec = &elf64_freebsd_sysvec_v1, 142 .interp_newpath = NULL, 143 .brand_note = &elf64_freebsd_brandnote, 144 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 145 .header_supported = &ppc64_elfv1_header_match 146 }; 147 148 SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY, 149 (sysinit_cfunc_t) elf64_insert_brand_entry, 150 &freebsd_brand_info_elfv1); 151 152 static Elf64_Brandinfo freebsd_brand_info_elfv2 = { 153 .brand = ELFOSABI_FREEBSD, 154 .machine = EM_PPC64, 155 .compat_3_brand = "FreeBSD", 156 .emul_path = NULL, 157 .interp_path = "/libexec/ld-elf.so.1", 158 .sysvec = &elf64_freebsd_sysvec_v2, 159 .interp_newpath = NULL, 160 .brand_note = &elf64_freebsd_brandnote, 161 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 162 .header_supported = &ppc64_elfv2_header_match 163 }; 164 165 SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY, 166 (sysinit_cfunc_t) elf64_insert_brand_entry, 167 &freebsd_brand_info_elfv2); 168 169 static Elf64_Brandinfo freebsd_brand_oinfo = { 170 .brand = ELFOSABI_FREEBSD, 171 .machine = EM_PPC64, 172 .compat_3_brand = "FreeBSD", 173 .emul_path = NULL, 174 .interp_path = "/usr/libexec/ld-elf.so.1", 175 .sysvec = &elf64_freebsd_sysvec_v1, 176 .interp_newpath = NULL, 177 .brand_note = &elf64_freebsd_brandnote, 178 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 179 .header_supported = &ppc64_elfv1_header_match 180 }; 181 182 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 183 (sysinit_cfunc_t) elf64_insert_brand_entry, 184 &freebsd_brand_oinfo); 185 186 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 187 188 static boolean_t 189 ppc64_elfv1_header_match(struct image_params *params) 190 { 191 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 192 int abi = (hdr->e_flags & 3); 193 194 return (abi == 0 || abi == 1); 195 } 196 197 static boolean_t 198 ppc64_elfv2_header_match(struct image_params *params) 199 { 200 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header; 201 int abi = (hdr->e_flags & 3); 202 203 return (abi == 2); 204 } 205 206 static void 207 exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 208 u_long stack) 209 { 210 struct trapframe *tf; 211 register_t entry_desc[3]; 212 213 tf = trapframe(td); 214 exec_setregs(td, imgp, stack); 215 216 /* 217 * For 64-bit ELFv1, we need to disentangle the function 218 * descriptor 219 * 220 * 0. entry point 221 * 1. TOC value (r2) 222 * 2. Environment pointer (r11) 223 */ 224 225 (void)copyin((void *)imgp->entry_addr, entry_desc, 226 sizeof(entry_desc)); 227 tf->srr0 = entry_desc[0] + imgp->reloc_base; 228 tf->fixreg[2] = entry_desc[1] + imgp->reloc_base; 229 tf->fixreg[11] = entry_desc[2] + imgp->reloc_base; 230 } 231 232 void 233 elf64_dump_thread(struct thread *td, void *dst, size_t *off) 234 { 235 size_t len; 236 struct pcb *pcb; 237 uint64_t vshr[32]; 238 uint64_t *vsr_dw1; 239 int vsr_idx; 240 241 len = 0; 242 pcb = td->td_pcb; 243 244 if (pcb->pcb_flags & PCB_VEC) { 245 save_vec_nodrop(td); 246 if (dst != NULL) { 247 len += elf64_populate_note(NT_PPC_VMX, 248 &pcb->pcb_vec, (char *)dst + len, 249 sizeof(pcb->pcb_vec), NULL); 250 } else 251 len += elf64_populate_note(NT_PPC_VMX, NULL, NULL, 252 sizeof(pcb->pcb_vec), NULL); 253 } 254 255 if (pcb->pcb_flags & PCB_VSX) { 256 save_fpu_nodrop(td); 257 if (dst != NULL) { 258 /* 259 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 260 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 261 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 262 */ 263 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 264 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 265 vshr[vsr_idx] = *vsr_dw1; 266 } 267 len += elf64_populate_note(NT_PPC_VSX, 268 vshr, (char *)dst + len, 269 sizeof(vshr), NULL); 270 } else 271 len += elf64_populate_note(NT_PPC_VSX, NULL, NULL, 272 sizeof(vshr), NULL); 273 } 274 275 *off = len; 276 } 277 278 bool 279 elf_is_ifunc_reloc(Elf_Size r_info __unused) 280 { 281 282 return (false); 283 } 284 285 /* Process one elf relocation with addend. */ 286 static int 287 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 288 int type, int local, elf_lookup_fn lookup) 289 { 290 Elf_Addr *where; 291 Elf_Addr addr; 292 Elf_Addr addend; 293 Elf_Word rtype, symidx; 294 const Elf_Rela *rela; 295 int error; 296 297 switch (type) { 298 case ELF_RELOC_REL: 299 panic("PPC only supports RELA relocations"); 300 break; 301 case ELF_RELOC_RELA: 302 rela = (const Elf_Rela *)data; 303 where = (Elf_Addr *) (relocbase + rela->r_offset); 304 addend = rela->r_addend; 305 rtype = ELF_R_TYPE(rela->r_info); 306 symidx = ELF_R_SYM(rela->r_info); 307 break; 308 default: 309 panic("elf_reloc: unknown relocation mode %d\n", type); 310 } 311 312 switch (rtype) { 313 314 case R_PPC_NONE: 315 break; 316 317 case R_PPC64_ADDR64: /* doubleword64 S + A */ 318 error = lookup(lf, symidx, 1, &addr); 319 if (error != 0) 320 return -1; 321 addr += addend; 322 *where = addr; 323 break; 324 325 case R_PPC_RELATIVE: /* doubleword64 B + A */ 326 *where = elf_relocaddr(lf, relocbase + addend); 327 break; 328 329 case R_PPC_JMP_SLOT: /* function descriptor copy */ 330 lookup(lf, symidx, 1, &addr); 331 #if !defined(_CALL_ELF) || _CALL_ELF == 1 332 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr)); 333 #else 334 *where = addr; 335 #endif 336 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory"); 337 break; 338 339 default: 340 printf("kldload: unexpected relocation type %d\n", 341 (int) rtype); 342 return -1; 343 } 344 return(0); 345 } 346 347 void 348 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 349 { 350 Elf_Rela *rela = NULL, *relalim; 351 Elf_Addr relasz = 0; 352 Elf_Addr *where; 353 354 /* 355 * Extract the rela/relasz values from the dynamic section 356 */ 357 for (; dynp->d_tag != DT_NULL; dynp++) { 358 switch (dynp->d_tag) { 359 case DT_RELA: 360 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 361 break; 362 case DT_RELASZ: 363 relasz = dynp->d_un.d_val; 364 break; 365 } 366 } 367 368 /* 369 * Relocate these values 370 */ 371 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 372 for (; rela < relalim; rela++) { 373 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 374 continue; 375 where = (Elf_Addr *)(relocbase + rela->r_offset); 376 *where = (Elf_Addr)(relocbase + rela->r_addend); 377 } 378 } 379 380 int 381 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 382 elf_lookup_fn lookup) 383 { 384 385 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 386 } 387 388 int 389 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 390 int type, elf_lookup_fn lookup) 391 { 392 393 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 394 } 395 396 int 397 elf_cpu_load_file(linker_file_t lf) 398 { 399 /* Only sync the cache for non-kernel modules */ 400 if (lf->id != 1) 401 __syncicache(lf->address, lf->size); 402 return (0); 403 } 404 405 int 406 elf_cpu_unload_file(linker_file_t lf __unused) 407 { 408 409 return (0); 410 } 411