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/elf.h> 52 #include <machine/md_var.h> 53 54 static void exec_setregs_funcdesc(struct thread *td, struct image_params *imgp, 55 u_long stack); 56 57 struct sysentvec elf64_freebsd_sysvec_v1 = { 58 .sv_size = SYS_MAXSYSCALL, 59 .sv_table = sysent, 60 .sv_mask = 0, 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, 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_pagesize = PAGE_SIZE, 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_strings = exec_copyout_strings, 118 .sv_setregs = exec_setregs, 119 .sv_fixlimit = NULL, 120 .sv_maxssiz = NULL, 121 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP, 122 .sv_set_syscall_retval = cpu_set_syscall_retval, 123 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 124 .sv_syscallnames = syscallnames, 125 .sv_shared_page_base = SHAREDPAGE, 126 .sv_shared_page_len = PAGE_SIZE, 127 .sv_schedtail = NULL, 128 .sv_thread_detach = NULL, 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; 237 238 len = 0; 239 pcb = td->td_pcb; 240 if (pcb->pcb_flags & PCB_VEC) { 241 save_vec_nodrop(td); 242 if (dst != NULL) { 243 len += elf64_populate_note(NT_PPC_VMX, 244 &pcb->pcb_vec, dst, 245 sizeof(pcb->pcb_vec), NULL); 246 } else 247 len += elf64_populate_note(NT_PPC_VMX, NULL, NULL, 248 sizeof(pcb->pcb_vec), NULL); 249 } 250 *off = len; 251 } 252 253 254 /* Process one elf relocation with addend. */ 255 static int 256 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 257 int type, int local, elf_lookup_fn lookup) 258 { 259 Elf_Addr *where; 260 Elf_Addr addr; 261 Elf_Addr addend; 262 Elf_Word rtype, symidx; 263 const Elf_Rela *rela; 264 int error; 265 266 switch (type) { 267 case ELF_RELOC_REL: 268 panic("PPC only supports RELA relocations"); 269 break; 270 case ELF_RELOC_RELA: 271 rela = (const Elf_Rela *)data; 272 where = (Elf_Addr *) (relocbase + rela->r_offset); 273 addend = rela->r_addend; 274 rtype = ELF_R_TYPE(rela->r_info); 275 symidx = ELF_R_SYM(rela->r_info); 276 break; 277 default: 278 panic("elf_reloc: unknown relocation mode %d\n", type); 279 } 280 281 switch (rtype) { 282 283 case R_PPC_NONE: 284 break; 285 286 case R_PPC64_ADDR64: /* doubleword64 S + A */ 287 error = lookup(lf, symidx, 1, &addr); 288 if (error != 0) 289 return -1; 290 addr += addend; 291 *where = addr; 292 break; 293 294 case R_PPC_RELATIVE: /* doubleword64 B + A */ 295 *where = elf_relocaddr(lf, relocbase + addend); 296 break; 297 298 case R_PPC_JMP_SLOT: /* function descriptor copy */ 299 lookup(lf, symidx, 1, &addr); 300 #if !defined(_CALL_ELF) || _CALL_ELF == 1 301 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr)); 302 #else 303 memcpy(where, (Elf_Addr *)addr, sizeof(Elf_Addr)); 304 #endif 305 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory"); 306 break; 307 308 default: 309 printf("kldload: unexpected relocation type %d\n", 310 (int) rtype); 311 return -1; 312 } 313 return(0); 314 } 315 316 void 317 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 318 { 319 Elf_Rela *rela = NULL, *relalim; 320 Elf_Addr relasz = 0; 321 Elf_Addr *where; 322 323 /* 324 * Extract the rela/relasz values from the dynamic section 325 */ 326 for (; dynp->d_tag != DT_NULL; dynp++) { 327 switch (dynp->d_tag) { 328 case DT_RELA: 329 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 330 break; 331 case DT_RELASZ: 332 relasz = dynp->d_un.d_val; 333 break; 334 } 335 } 336 337 /* 338 * Relocate these values 339 */ 340 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 341 for (; rela < relalim; rela++) { 342 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 343 continue; 344 where = (Elf_Addr *)(relocbase + rela->r_offset); 345 *where = (Elf_Addr)(relocbase + rela->r_addend); 346 } 347 } 348 349 int 350 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 351 elf_lookup_fn lookup) 352 { 353 354 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 355 } 356 357 int 358 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 359 int type, elf_lookup_fn lookup) 360 { 361 362 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 363 } 364 365 int 366 elf_cpu_load_file(linker_file_t lf) 367 { 368 /* Only sync the cache for non-kernel modules */ 369 if (lf->id != 1) 370 __syncicache(lf->address, lf->size); 371 return (0); 372 } 373 374 int 375 elf_cpu_unload_file(linker_file_t lf __unused) 376 { 377 378 return (0); 379 } 380