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_minuser = VM_MIN_ADDRESS, 98 .sv_stackprot = VM_PROT_ALL, 99 #ifdef __powerpc64__ 100 .sv_maxuser = VM_MAXUSER_ADDRESS32, 101 .sv_usrstack = FREEBSD32_USRSTACK, 102 .sv_psstrings = FREEBSD32_PS_STRINGS, 103 .sv_copyout_strings = freebsd32_copyout_strings, 104 .sv_setregs = ppc32_setregs, 105 .sv_syscallnames = freebsd32_syscallnames, 106 .sv_fixlimit = ppc32_fixlimit, 107 #else 108 .sv_maxuser = VM_MAXUSER_ADDRESS, 109 .sv_usrstack = USRSTACK, 110 .sv_psstrings = PS_STRINGS, 111 .sv_copyout_strings = exec_copyout_strings, 112 .sv_setregs = exec_setregs, 113 .sv_syscallnames = syscallnames, 114 .sv_fixlimit = NULL, 115 #endif 116 .sv_maxssiz = NULL, 117 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_ASLR, 118 .sv_set_syscall_retval = cpu_set_syscall_retval, 119 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 120 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 121 .sv_shared_page_len = PAGE_SIZE, 122 .sv_schedtail = NULL, 123 .sv_thread_detach = NULL, 124 .sv_trap = NULL, 125 .sv_hwcap = &cpu_features, 126 .sv_hwcap2 = &cpu_features2, 127 }; 128 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 129 130 static Elf32_Brandinfo freebsd_brand_info = { 131 .brand = ELFOSABI_FREEBSD, 132 .machine = EM_PPC, 133 .compat_3_brand = "FreeBSD", 134 .emul_path = NULL, 135 .interp_path = "/libexec/ld-elf.so.1", 136 .sysvec = &elf32_freebsd_sysvec, 137 #ifdef __powerpc64__ 138 .interp_newpath = "/libexec/ld-elf32.so.1", 139 #else 140 .interp_newpath = NULL, 141 #endif 142 .brand_note = &elf32_freebsd_brandnote, 143 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 144 }; 145 146 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 147 (sysinit_cfunc_t) elf32_insert_brand_entry, 148 &freebsd_brand_info); 149 150 static Elf32_Brandinfo freebsd_brand_oinfo = { 151 .brand = ELFOSABI_FREEBSD, 152 .machine = EM_PPC, 153 .compat_3_brand = "FreeBSD", 154 .emul_path = NULL, 155 .interp_path = "/usr/libexec/ld-elf.so.1", 156 .sysvec = &elf32_freebsd_sysvec, 157 .interp_newpath = NULL, 158 .brand_note = &elf32_freebsd_brandnote, 159 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 160 }; 161 162 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 163 (sysinit_cfunc_t) elf32_insert_brand_entry, 164 &freebsd_brand_oinfo); 165 166 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 167 168 void 169 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 170 { 171 size_t len; 172 struct pcb *pcb; 173 uint64_t vshr[32]; 174 uint64_t *vsr_dw1; 175 int vsr_idx; 176 177 len = 0; 178 pcb = td->td_pcb; 179 180 if (pcb->pcb_flags & PCB_VEC) { 181 save_vec_nodrop(td); 182 if (dst != NULL) { 183 len += elf32_populate_note(NT_PPC_VMX, 184 &pcb->pcb_vec, (char *)dst + len, 185 sizeof(pcb->pcb_vec), NULL); 186 } else 187 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL, 188 sizeof(pcb->pcb_vec), NULL); 189 } 190 191 if (pcb->pcb_flags & PCB_VSX) { 192 save_fpu_nodrop(td); 193 if (dst != NULL) { 194 /* 195 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 196 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 197 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 198 */ 199 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 200 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 201 vshr[vsr_idx] = *vsr_dw1; 202 } 203 len += elf32_populate_note(NT_PPC_VSX, 204 vshr, (char *)dst + len, 205 sizeof(vshr), NULL); 206 } else 207 len += elf32_populate_note(NT_PPC_VSX, NULL, NULL, 208 sizeof(vshr), NULL); 209 } 210 211 *off = len; 212 } 213 214 #ifndef __powerpc64__ 215 bool 216 elf_is_ifunc_reloc(Elf_Size r_info __unused) 217 { 218 219 return (false); 220 } 221 222 /* Process one elf relocation with addend. */ 223 static int 224 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 225 int type, int local, elf_lookup_fn lookup) 226 { 227 Elf_Addr *where; 228 Elf_Half *hwhere; 229 Elf_Addr addr; 230 Elf_Addr addend; 231 Elf_Word rtype, symidx; 232 const Elf_Rela *rela; 233 int error; 234 235 switch (type) { 236 case ELF_RELOC_REL: 237 panic("PPC only supports RELA relocations"); 238 break; 239 case ELF_RELOC_RELA: 240 rela = (const Elf_Rela *)data; 241 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset); 242 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset); 243 addend = rela->r_addend; 244 rtype = ELF_R_TYPE(rela->r_info); 245 symidx = ELF_R_SYM(rela->r_info); 246 break; 247 default: 248 panic("elf_reloc: unknown relocation mode %d\n", type); 249 } 250 251 switch (rtype) { 252 253 case R_PPC_NONE: 254 break; 255 256 case R_PPC_ADDR32: /* word32 S + A */ 257 error = lookup(lf, symidx, 1, &addr); 258 if (error != 0) 259 return -1; 260 *where = elf_relocaddr(lf, addr + addend); 261 break; 262 263 case R_PPC_ADDR16_LO: /* #lo(S) */ 264 error = lookup(lf, symidx, 1, &addr); 265 if (error != 0) 266 return -1; 267 /* 268 * addend values are sometimes relative to sections 269 * (i.e. .rodata) in rela, where in reality they 270 * are relative to relocbase. Detect this condition. 271 */ 272 if (addr > relocbase && addr <= (relocbase + addend)) 273 addr = relocbase; 274 addr = elf_relocaddr(lf, addr + addend); 275 *hwhere = addr & 0xffff; 276 break; 277 278 case R_PPC_ADDR16_HA: /* #ha(S) */ 279 error = lookup(lf, symidx, 1, &addr); 280 if (error != 0) 281 return -1; 282 /* 283 * addend values are sometimes relative to sections 284 * (i.e. .rodata) in rela, where in reality they 285 * are relative to relocbase. Detect this condition. 286 */ 287 if (addr > relocbase && addr <= (relocbase + addend)) 288 addr = relocbase; 289 addr = elf_relocaddr(lf, addr + addend); 290 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 291 & 0xffff; 292 break; 293 294 case R_PPC_RELATIVE: /* word32 B + A */ 295 *where = elf_relocaddr(lf, relocbase + addend); 296 break; 297 298 default: 299 printf("kldload: unexpected relocation type %d\n", 300 (int) rtype); 301 return -1; 302 } 303 return(0); 304 } 305 306 void 307 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 308 { 309 Elf_Rela *rela = NULL, *relalim; 310 Elf_Addr relasz = 0; 311 Elf_Addr *where; 312 313 /* 314 * Extract the rela/relasz values from the dynamic section 315 */ 316 for (; dynp->d_tag != DT_NULL; dynp++) { 317 switch (dynp->d_tag) { 318 case DT_RELA: 319 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 320 break; 321 case DT_RELASZ: 322 relasz = dynp->d_un.d_val; 323 break; 324 } 325 } 326 327 /* 328 * Relocate these values 329 */ 330 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 331 for (; rela < relalim; rela++) { 332 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 333 continue; 334 where = (Elf_Addr *)(relocbase + rela->r_offset); 335 *where = (Elf_Addr)(relocbase + rela->r_addend); 336 } 337 } 338 339 int 340 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 341 elf_lookup_fn lookup) 342 { 343 344 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 345 } 346 347 int 348 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 349 int type, elf_lookup_fn lookup) 350 { 351 352 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 353 } 354 355 int 356 elf_cpu_load_file(linker_file_t lf) 357 { 358 /* Only sync the cache for non-kernel modules */ 359 if (lf->id != 1) 360 __syncicache(lf->address, lf->size); 361 return (0); 362 } 363 364 int 365 elf_cpu_unload_file(linker_file_t lf __unused) 366 { 367 368 return (0); 369 } 370 #endif 371 372 #ifdef __powerpc64__ 373 static void 374 ppc32_fixlimit(struct rlimit *rl, int which) 375 { 376 switch (which) { 377 case RLIMIT_DATA: 378 if (ppc32_maxdsiz != 0) { 379 if (rl->rlim_cur > ppc32_maxdsiz) 380 rl->rlim_cur = ppc32_maxdsiz; 381 if (rl->rlim_max > ppc32_maxdsiz) 382 rl->rlim_max = ppc32_maxdsiz; 383 } 384 break; 385 case RLIMIT_STACK: 386 if (ppc32_maxssiz != 0) { 387 if (rl->rlim_cur > ppc32_maxssiz) 388 rl->rlim_cur = ppc32_maxssiz; 389 if (rl->rlim_max > ppc32_maxssiz) 390 rl->rlim_max = ppc32_maxssiz; 391 } 392 break; 393 } 394 } 395 #endif 396