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_mask = 0, 87 .sv_errsize = 0, 88 .sv_errtbl = NULL, 89 .sv_transtrap = NULL, 90 .sv_fixup = __elfN(freebsd_fixup), 91 .sv_sendsig = sendsig, 92 .sv_sigcode = sigcode32, 93 .sv_szsigcode = &szsigcode32, 94 .sv_name = "FreeBSD ELF32", 95 .sv_coredump = __elfN(coredump), 96 .sv_imgact_try = NULL, 97 .sv_minsigstksz = MINSIGSTKSZ, 98 .sv_pagesize = PAGE_SIZE, 99 .sv_minuser = VM_MIN_ADDRESS, 100 .sv_stackprot = VM_PROT_ALL, 101 #ifdef __powerpc64__ 102 .sv_maxuser = VM_MAXUSER_ADDRESS, 103 .sv_usrstack = FREEBSD32_USRSTACK, 104 .sv_psstrings = FREEBSD32_PS_STRINGS, 105 .sv_copyout_strings = freebsd32_copyout_strings, 106 .sv_setregs = ppc32_setregs, 107 .sv_syscallnames = freebsd32_syscallnames, 108 .sv_fixlimit = ppc32_fixlimit, 109 #else 110 .sv_maxuser = VM_MAXUSER_ADDRESS, 111 .sv_usrstack = USRSTACK, 112 .sv_psstrings = PS_STRINGS, 113 .sv_copyout_strings = exec_copyout_strings, 114 .sv_setregs = exec_setregs, 115 .sv_syscallnames = syscallnames, 116 .sv_fixlimit = NULL, 117 #endif 118 .sv_maxssiz = NULL, 119 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP, 120 .sv_set_syscall_retval = cpu_set_syscall_retval, 121 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 122 .sv_shared_page_base = FREEBSD32_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(elf32_sysvec, &elf32_freebsd_sysvec); 131 132 static Elf32_Brandinfo freebsd_brand_info = { 133 .brand = ELFOSABI_FREEBSD, 134 .machine = EM_PPC, 135 .compat_3_brand = "FreeBSD", 136 .emul_path = NULL, 137 .interp_path = "/libexec/ld-elf.so.1", 138 .sysvec = &elf32_freebsd_sysvec, 139 #ifdef __powerpc64__ 140 .interp_newpath = "/libexec/ld-elf32.so.1", 141 #else 142 .interp_newpath = NULL, 143 #endif 144 .brand_note = &elf32_freebsd_brandnote, 145 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 146 }; 147 148 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 149 (sysinit_cfunc_t) elf32_insert_brand_entry, 150 &freebsd_brand_info); 151 152 static Elf32_Brandinfo freebsd_brand_oinfo = { 153 .brand = ELFOSABI_FREEBSD, 154 .machine = EM_PPC, 155 .compat_3_brand = "FreeBSD", 156 .emul_path = NULL, 157 .interp_path = "/usr/libexec/ld-elf.so.1", 158 .sysvec = &elf32_freebsd_sysvec, 159 .interp_newpath = NULL, 160 .brand_note = &elf32_freebsd_brandnote, 161 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 162 }; 163 164 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 165 (sysinit_cfunc_t) elf32_insert_brand_entry, 166 &freebsd_brand_oinfo); 167 168 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase); 169 170 void 171 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 172 { 173 size_t len; 174 struct pcb *pcb; 175 uint64_t vshr[32]; 176 uint64_t *vsr_dw1; 177 int vsr_idx; 178 179 len = 0; 180 pcb = td->td_pcb; 181 182 if (pcb->pcb_flags & PCB_VEC) { 183 save_vec_nodrop(td); 184 if (dst != NULL) { 185 len += elf32_populate_note(NT_PPC_VMX, 186 &pcb->pcb_vec, (char *)dst + len, 187 sizeof(pcb->pcb_vec), NULL); 188 } else 189 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL, 190 sizeof(pcb->pcb_vec), NULL); 191 } 192 193 if (pcb->pcb_flags & PCB_VSX) { 194 save_fpu_nodrop(td); 195 if (dst != NULL) { 196 /* 197 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and 198 * VSR32-VSR63 overlap with VR0-VR31, so we only copy 199 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31. 200 */ 201 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) { 202 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2]; 203 vshr[vsr_idx] = *vsr_dw1; 204 } 205 len += elf32_populate_note(NT_PPC_VSX, 206 vshr, (char *)dst + len, 207 sizeof(vshr), NULL); 208 } else 209 len += elf32_populate_note(NT_PPC_VSX, NULL, NULL, 210 sizeof(vshr), NULL); 211 } 212 213 *off = len; 214 } 215 216 #ifndef __powerpc64__ 217 bool 218 elf_is_ifunc_reloc(Elf_Size r_info __unused) 219 { 220 221 return (false); 222 } 223 224 /* Process one elf relocation with addend. */ 225 static int 226 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 227 int type, int local, elf_lookup_fn lookup) 228 { 229 Elf_Addr *where; 230 Elf_Half *hwhere; 231 Elf_Addr addr; 232 Elf_Addr addend; 233 Elf_Word rtype, symidx; 234 const Elf_Rela *rela; 235 int error; 236 237 switch (type) { 238 case ELF_RELOC_REL: 239 panic("PPC only supports RELA relocations"); 240 break; 241 case ELF_RELOC_RELA: 242 rela = (const Elf_Rela *)data; 243 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset); 244 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset); 245 addend = rela->r_addend; 246 rtype = ELF_R_TYPE(rela->r_info); 247 symidx = ELF_R_SYM(rela->r_info); 248 break; 249 default: 250 panic("elf_reloc: unknown relocation mode %d\n", type); 251 } 252 253 switch (rtype) { 254 255 case R_PPC_NONE: 256 break; 257 258 case R_PPC_ADDR32: /* word32 S + A */ 259 error = lookup(lf, symidx, 1, &addr); 260 if (error != 0) 261 return -1; 262 *where = elf_relocaddr(lf, addr + addend); 263 break; 264 265 case R_PPC_ADDR16_LO: /* #lo(S) */ 266 error = lookup(lf, symidx, 1, &addr); 267 if (error != 0) 268 return -1; 269 /* 270 * addend values are sometimes relative to sections 271 * (i.e. .rodata) in rela, where in reality they 272 * are relative to relocbase. Detect this condition. 273 */ 274 if (addr > relocbase && addr <= (relocbase + addend)) 275 addr = relocbase; 276 addr = elf_relocaddr(lf, addr + addend); 277 *hwhere = addr & 0xffff; 278 break; 279 280 case R_PPC_ADDR16_HA: /* #ha(S) */ 281 error = lookup(lf, symidx, 1, &addr); 282 if (error != 0) 283 return -1; 284 /* 285 * addend values are sometimes relative to sections 286 * (i.e. .rodata) in rela, where in reality they 287 * are relative to relocbase. Detect this condition. 288 */ 289 if (addr > relocbase && addr <= (relocbase + addend)) 290 addr = relocbase; 291 addr = elf_relocaddr(lf, addr + addend); 292 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0)) 293 & 0xffff; 294 break; 295 296 case R_PPC_RELATIVE: /* word32 B + A */ 297 *where = elf_relocaddr(lf, relocbase + addend); 298 break; 299 300 default: 301 printf("kldload: unexpected relocation type %d\n", 302 (int) rtype); 303 return -1; 304 } 305 return(0); 306 } 307 308 void 309 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase) 310 { 311 Elf_Rela *rela = NULL, *relalim; 312 Elf_Addr relasz = 0; 313 Elf_Addr *where; 314 315 /* 316 * Extract the rela/relasz values from the dynamic section 317 */ 318 for (; dynp->d_tag != DT_NULL; dynp++) { 319 switch (dynp->d_tag) { 320 case DT_RELA: 321 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr); 322 break; 323 case DT_RELASZ: 324 relasz = dynp->d_un.d_val; 325 break; 326 } 327 } 328 329 /* 330 * Relocate these values 331 */ 332 relalim = (Elf_Rela *)((caddr_t)rela + relasz); 333 for (; rela < relalim; rela++) { 334 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE) 335 continue; 336 where = (Elf_Addr *)(relocbase + rela->r_offset); 337 *where = (Elf_Addr)(relocbase + rela->r_addend); 338 } 339 } 340 341 int 342 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 343 elf_lookup_fn lookup) 344 { 345 346 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 347 } 348 349 int 350 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 351 int type, elf_lookup_fn lookup) 352 { 353 354 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 355 } 356 357 int 358 elf_cpu_load_file(linker_file_t lf) 359 { 360 /* Only sync the cache for non-kernel modules */ 361 if (lf->id != 1) 362 __syncicache(lf->address, lf->size); 363 return (0); 364 } 365 366 int 367 elf_cpu_unload_file(linker_file_t lf __unused) 368 { 369 370 return (0); 371 } 372 #endif 373 374 #ifdef __powerpc64__ 375 static void 376 ppc32_fixlimit(struct rlimit *rl, int which) 377 { 378 switch (which) { 379 case RLIMIT_DATA: 380 if (ppc32_maxdsiz != 0) { 381 if (rl->rlim_cur > ppc32_maxdsiz) 382 rl->rlim_cur = ppc32_maxdsiz; 383 if (rl->rlim_max > ppc32_maxdsiz) 384 rl->rlim_max = ppc32_maxdsiz; 385 } 386 break; 387 case RLIMIT_STACK: 388 if (ppc32_maxssiz != 0) { 389 if (rl->rlim_cur > ppc32_maxssiz) 390 rl->rlim_cur = ppc32_maxssiz; 391 if (rl->rlim_max > ppc32_maxssiz) 392 rl->rlim_max = ppc32_maxssiz; 393 } 394 break; 395 } 396 } 397 #endif 398