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 34 #define __ELF_WORD_SIZE 32 35 36 #include <sys/exec.h> 37 #include <sys/imgact.h> 38 #include <sys/malloc.h> 39 #include <sys/proc.h> 40 #include <sys/namei.h> 41 #include <sys/fcntl.h> 42 #include <sys/sysent.h> 43 #include <sys/imgact_elf.h> 44 #include <sys/syscall.h> 45 #include <sys/sysctl.h> 46 #include <sys/signalvar.h> 47 #include <sys/vnode.h> 48 #include <sys/linker.h> 49 50 #include <vm/vm.h> 51 #include <vm/vm_param.h> 52 53 #include <machine/altivec.h> 54 #include <machine/cpu.h> 55 #include <machine/fpu.h> 56 #include <machine/elf.h> 57 #include <machine/reg.h> 58 #include <machine/md_var.h> 59 60 #ifdef __powerpc64__ 61 #include <compat/freebsd32/freebsd32_proto.h> 62 #include <compat/freebsd32/freebsd32_util.h> 63 64 extern const char *freebsd32_syscallnames[]; 65 static void ppc32_fixlimit(struct rlimit *rl, int which); 66 67 static SYSCTL_NODE(_compat, OID_AUTO, ppc32, CTLFLAG_RW, 0, "32-bit mode"); 68 69 #define PPC32_MAXDSIZ (1024*1024*1024) 70 static u_long ppc32_maxdsiz = PPC32_MAXDSIZ; 71 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ppc32_maxdsiz, 72 0, ""); 73 #define PPC32_MAXSSIZ (64*1024*1024) 74 u_long ppc32_maxssiz = PPC32_MAXSSIZ; 75 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ppc32_maxssiz, 76 0, ""); 77 #endif 78 79 struct sysentvec elf32_freebsd_sysvec = { 80 .sv_size = SYS_MAXSYSCALL, 81 #ifdef __powerpc64__ 82 .sv_table = freebsd32_sysent, 83 #else 84 .sv_table = sysent, 85 #endif 86 .sv_errsize = 0, 87 .sv_errtbl = NULL, 88 .sv_transtrap = NULL, 89 .sv_fixup = __elfN(freebsd_fixup), 90 .sv_sendsig = sendsig, 91 .sv_sigcode = sigcode32, 92 .sv_szsigcode = &szsigcode32, 93 .sv_name = "FreeBSD ELF32", 94 .sv_coredump = __elfN(coredump), 95 .sv_imgact_try = NULL, 96 .sv_minsigstksz = MINSIGSTKSZ, 97 .sv_pagesize = PAGE_SIZE, 98 .sv_minuser = VM_MIN_ADDRESS, 99 .sv_stackprot = VM_PROT_ALL, 100 #ifdef __powerpc64__ 101 .sv_maxuser = VM_MAXUSER_ADDRESS, 102 .sv_usrstack = FREEBSD32_USRSTACK, 103 .sv_psstrings = FREEBSD32_PS_STRINGS, 104 .sv_copyout_strings = freebsd32_copyout_strings, 105 .sv_setregs = ppc32_setregs, 106 .sv_syscallnames = freebsd32_syscallnames, 107 .sv_fixlimit = ppc32_fixlimit, 108 #else 109 .sv_maxuser = VM_MAXUSER_ADDRESS, 110 .sv_usrstack = USRSTACK, 111 .sv_psstrings = PS_STRINGS, 112 .sv_copyout_strings = exec_copyout_strings, 113 .sv_setregs = exec_setregs, 114 .sv_syscallnames = syscallnames, 115 .sv_fixlimit = NULL, 116 #endif 117 .sv_maxssiz = NULL, 118 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_ASLR, 119 .sv_set_syscall_retval = cpu_set_syscall_retval, 120 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 121 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 122 .sv_shared_page_len = PAGE_SIZE, 123 .sv_schedtail = NULL, 124 .sv_thread_detach = NULL, 125 .sv_trap = NULL, 126 .sv_hwcap = &cpu_features, 127 .sv_hwcap2 = &cpu_features2, 128 }; 129 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 130 131 static Elf32_Brandinfo freebsd_brand_info = { 132 .brand = ELFOSABI_FREEBSD, 133 .machine = EM_PPC, 134 .compat_3_brand = "FreeBSD", 135 .emul_path = NULL, 136 .interp_path = "/libexec/ld-elf.so.1", 137 .sysvec = &elf32_freebsd_sysvec, 138 #ifdef __powerpc64__ 139 .interp_newpath = "/libexec/ld-elf32.so.1", 140 #else 141 .interp_newpath = NULL, 142 #endif 143 .brand_note = &elf32_freebsd_brandnote, 144 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 145 }; 146 147 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 148 (sysinit_cfunc_t) elf32_insert_brand_entry, 149 &freebsd_brand_info); 150 151 static Elf32_Brandinfo freebsd_brand_oinfo = { 152 .brand = ELFOSABI_FREEBSD, 153 .machine = EM_PPC, 154 .compat_3_brand = "FreeBSD", 155 .emul_path = NULL, 156 .interp_path = "/usr/libexec/ld-elf.so.1", 157 .sysvec = &elf32_freebsd_sysvec, 158 .interp_newpath = NULL, 159 .brand_note = &elf32_freebsd_brandnote, 160 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 161 }; 162 163 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 164 (sysinit_cfunc_t) elf32_insert_brand_entry, 165 &freebsd_brand_oinfo); 166 167 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 168 169 void 170 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 171 { 172 size_t len; 173 struct pcb *pcb; 174 uint64_t vshr[32]; 175 uint64_t *vsr_dw1; 176 int vsr_idx; 177 178 len = 0; 179 pcb = td->td_pcb; 180 181 if (pcb->pcb_flags & PCB_VEC) { 182 save_vec_nodrop(td); 183 if (dst != NULL) { 184 len += elf32_populate_note(NT_PPC_VMX, 185 &pcb->pcb_vec, (char *)dst + len, 186 sizeof(pcb->pcb_vec), NULL); 187 } else 188 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL, 189 sizeof(pcb->pcb_vec), NULL); 190 } 191 192 if (pcb->pcb_flags & PCB_VSX) { 193 save_fpu_nodrop(td); 194 if (dst != NULL) { 195 /* 196 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 197 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 198 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 199 */ 200 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 201 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 202 vshr[vsr_idx] = *vsr_dw1; 203 } 204 len += elf32_populate_note(NT_PPC_VSX, 205 vshr, (char *)dst + len, 206 sizeof(vshr), NULL); 207 } else 208 len += elf32_populate_note(NT_PPC_VSX, NULL, NULL, 209 sizeof(vshr), NULL); 210 } 211 212 *off = len; 213 } 214 215 #ifndef __powerpc64__ 216 bool 217 elf_is_ifunc_reloc(Elf_Size r_info __unused) 218 { 219 220 return (false); 221 } 222 223 /* Process one elf relocation with addend. */ 224 static int 225 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 226 int type, int local, elf_lookup_fn lookup) 227 { 228 Elf_Addr *where; 229 Elf_Half *hwhere; 230 Elf_Addr addr; 231 Elf_Addr addend; 232 Elf_Word rtype, symidx; 233 const Elf_Rela *rela; 234 int error; 235 236 switch (type) { 237 case ELF_RELOC_REL: 238 panic("PPC only supports RELA relocations"); 239 break; 240 case ELF_RELOC_RELA: 241 rela = (const Elf_Rela *)data; 242 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset); 243 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset); 244 addend = rela->r_addend; 245 rtype = ELF_R_TYPE(rela->r_info); 246 symidx = ELF_R_SYM(rela->r_info); 247 break; 248 default: 249 panic("elf_reloc: unknown relocation mode %d\n", type); 250 } 251 252 switch (rtype) { 253 254 case R_PPC_NONE: 255 break; 256 257 case R_PPC_ADDR32: /* word32 S + A */ 258 error = lookup(lf, symidx, 1, &addr); 259 if (error != 0) 260 return -1; 261 *where = elf_relocaddr(lf, addr + addend); 262 break; 263 264 case R_PPC_ADDR16_LO: /* #lo(S) */ 265 error = lookup(lf, symidx, 1, &addr); 266 if (error != 0) 267 return -1; 268 /* 269 * addend values are sometimes relative to sections 270 * (i.e. .rodata) in rela, where in reality they 271 * are relative to relocbase. Detect this condition. 272 */ 273 if (addr > relocbase && addr <= (relocbase + addend)) 274 addr = relocbase; 275 addr = elf_relocaddr(lf, addr + addend); 276 *hwhere = addr & 0xffff; 277 break; 278 279 case R_PPC_ADDR16_HA: /* #ha(S) */ 280 error = lookup(lf, symidx, 1, &addr); 281 if (error != 0) 282 return -1; 283 /* 284 * addend values are sometimes relative to sections 285 * (i.e. .rodata) in rela, where in reality they 286 * are relative to relocbase. Detect this condition. 287 */ 288 if (addr > relocbase && addr <= (relocbase + addend)) 289 addr = relocbase; 290 addr = elf_relocaddr(lf, addr + addend); 291 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 292 & 0xffff; 293 break; 294 295 case R_PPC_RELATIVE: /* word32 B + A */ 296 *where = elf_relocaddr(lf, relocbase + addend); 297 break; 298 299 default: 300 printf("kldload: unexpected relocation type %d\n", 301 (int) rtype); 302 return -1; 303 } 304 return(0); 305 } 306 307 void 308 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 309 { 310 Elf_Rela *rela = NULL, *relalim; 311 Elf_Addr relasz = 0; 312 Elf_Addr *where; 313 314 /* 315 * Extract the rela/relasz values from the dynamic section 316 */ 317 for (; dynp->d_tag != DT_NULL; dynp++) { 318 switch (dynp->d_tag) { 319 case DT_RELA: 320 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 321 break; 322 case DT_RELASZ: 323 relasz = dynp->d_un.d_val; 324 break; 325 } 326 } 327 328 /* 329 * Relocate these values 330 */ 331 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 332 for (; rela < relalim; rela++) { 333 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 334 continue; 335 where = (Elf_Addr *)(relocbase + rela->r_offset); 336 *where = (Elf_Addr)(relocbase + rela->r_addend); 337 } 338 } 339 340 int 341 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 342 elf_lookup_fn lookup) 343 { 344 345 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 346 } 347 348 int 349 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 350 int type, elf_lookup_fn lookup) 351 { 352 353 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 354 } 355 356 int 357 elf_cpu_load_file(linker_file_t lf) 358 { 359 /* Only sync the cache for non-kernel modules */ 360 if (lf->id != 1) 361 __syncicache(lf->address, lf->size); 362 return (0); 363 } 364 365 int 366 elf_cpu_unload_file(linker_file_t lf __unused) 367 { 368 369 return (0); 370 } 371 #endif 372 373 #ifdef __powerpc64__ 374 static void 375 ppc32_fixlimit(struct rlimit *rl, int which) 376 { 377 switch (which) { 378 case RLIMIT_DATA: 379 if (ppc32_maxdsiz != 0) { 380 if (rl->rlim_cur > ppc32_maxdsiz) 381 rl->rlim_cur = ppc32_maxdsiz; 382 if (rl->rlim_max > ppc32_maxdsiz) 383 rl->rlim_max = ppc32_maxdsiz; 384 } 385 break; 386 case RLIMIT_STACK: 387 if (ppc32_maxssiz != 0) { 388 if (rl->rlim_cur > ppc32_maxssiz) 389 rl->rlim_cur = ppc32_maxssiz; 390 if (rl->rlim_max > ppc32_maxssiz) 391 rl->rlim_max = ppc32_maxssiz; 392 } 393 break; 394 } 395 } 396 #endif 397