Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/mips/freebsd32_machdep.c
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1 /*- 2 * Copyright (c) 2012 Juli Mallett <jmallett@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/10.3/sys/mips/mips/freebsd32_machdep.c 294136 2016-01-16 07:56:49Z dchagin $ 27 */ 28 29 /* 30 * Based on nwhitehorn's COMPAT_FREEBSD32 support code for PowerPC64. 31 */ 32 33 #include "opt_compat.h" 34 35 #define __ELF_WORD_SIZE 32 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/kernel.h> 40 #include <sys/systm.h> 41 #include <sys/sysent.h> 42 #include <sys/exec.h> 43 #include <sys/imgact.h> 44 #include <sys/malloc.h> 45 #include <sys/proc.h> 46 #include <sys/namei.h> 47 #include <sys/fcntl.h> 48 #include <sys/sysent.h> 49 #include <sys/imgact_elf.h> 50 #include <sys/syscall.h> 51 #include <sys/syscallsubr.h> 52 #include <sys/sysproto.h> 53 #include <sys/signalvar.h> 54 #include <sys/vnode.h> 55 #include <sys/linker.h> 56 57 #include <vm/vm.h> 58 #include <vm/vm_param.h> 59 60 #include <machine/md_var.h> 61 #include <machine/reg.h> 62 #include <machine/sigframe.h> 63 #include <machine/sysarch.h> 64 65 #include <compat/freebsd32/freebsd32_signal.h> 66 #include <compat/freebsd32/freebsd32_util.h> 67 #include <compat/freebsd32/freebsd32_proto.h> 68 69 static void freebsd32_exec_setregs(struct thread *, struct image_params *, u_long); 70 static int get_mcontext32(struct thread *, mcontext32_t *, int); 71 static int set_mcontext32(struct thread *, mcontext32_t *); 72 static void freebsd32_sendsig(sig_t, ksiginfo_t *, sigset_t *); 73 74 extern const char *freebsd32_syscallnames[]; 75 76 struct sysentvec elf32_freebsd_sysvec = { 77 .sv_size = SYS_MAXSYSCALL, 78 .sv_table = freebsd32_sysent, 79 .sv_mask = 0, 80 .sv_sigsize = 0, 81 .sv_sigtbl = NULL, 82 .sv_errsize = 0, 83 .sv_errtbl = NULL, 84 .sv_transtrap = NULL, 85 .sv_fixup = __elfN(freebsd_fixup), 86 .sv_sendsig = freebsd32_sendsig, 87 .sv_sigcode = sigcode32, 88 .sv_szsigcode = &szsigcode32, 89 .sv_prepsyscall = NULL, 90 .sv_name = "FreeBSD ELF32", 91 .sv_coredump = __elfN(coredump), 92 .sv_imgact_try = NULL, 93 .sv_minsigstksz = MINSIGSTKSZ, 94 .sv_pagesize = PAGE_SIZE, 95 .sv_minuser = VM_MIN_ADDRESS, 96 .sv_maxuser = ((vm_offset_t)0x80000000), 97 .sv_usrstack = FREEBSD32_USRSTACK, 98 .sv_psstrings = FREEBSD32_PS_STRINGS, 99 .sv_stackprot = VM_PROT_ALL, 100 .sv_copyout_strings = freebsd32_copyout_strings, 101 .sv_setregs = freebsd32_exec_setregs, 102 .sv_fixlimit = NULL, 103 .sv_maxssiz = NULL, 104 .sv_flags = SV_ABI_FREEBSD | SV_ILP32, 105 .sv_set_syscall_retval = cpu_set_syscall_retval, 106 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 107 .sv_syscallnames = freebsd32_syscallnames, 108 .sv_schedtail = NULL, 109 .sv_thread_detach = NULL, 110 .sv_trap = NULL, 111 }; 112 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 113 114 static Elf32_Brandinfo freebsd_brand_info = { 115 .brand = ELFOSABI_FREEBSD, 116 .machine = EM_MIPS, 117 .compat_3_brand = "FreeBSD", 118 .emul_path = NULL, 119 .interp_path = "/libexec/ld-elf.so.1", 120 .sysvec = &elf32_freebsd_sysvec, 121 .interp_newpath = "/libexec/ld-elf32.so.1", 122 .flags = 0 123 }; 124 125 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 126 (sysinit_cfunc_t) elf32_insert_brand_entry, 127 &freebsd_brand_info); 128 129 static void 130 freebsd32_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 131 { 132 exec_setregs(td, imgp, stack); 133 134 /* 135 * See comment in exec_setregs about running 32-bit binaries with 64-bit 136 * registers. 137 */ 138 td->td_frame->sp -= 65536; 139 140 /* 141 * Clear extended address space bit for userland. 142 */ 143 td->td_frame->sr &= ~MIPS_SR_UX; 144 } 145 146 int 147 set_regs32(struct thread *td, struct reg32 *regs) 148 { 149 struct reg r; 150 unsigned i; 151 152 for (i = 0; i < NUMSAVEREGS; i++) 153 r.r_regs[i] = regs->r_regs[i]; 154 155 return (set_regs(td, &r)); 156 } 157 158 int 159 fill_regs32(struct thread *td, struct reg32 *regs) 160 { 161 struct reg r; 162 unsigned i; 163 int error; 164 165 error = fill_regs(td, &r); 166 if (error != 0) 167 return (error); 168 169 for (i = 0; i < NUMSAVEREGS; i++) 170 regs->r_regs[i] = r.r_regs[i]; 171 172 return (0); 173 } 174 175 int 176 set_fpregs32(struct thread *td, struct fpreg32 *fpregs) 177 { 178 struct fpreg fp; 179 unsigned i; 180 181 for (i = 0; i < NUMFPREGS; i++) 182 fp.r_regs[i] = fpregs->r_regs[i]; 183 184 return (set_fpregs(td, &fp)); 185 } 186 187 int 188 fill_fpregs32(struct thread *td, struct fpreg32 *fpregs) 189 { 190 struct fpreg fp; 191 unsigned i; 192 int error; 193 194 error = fill_fpregs(td, &fp); 195 if (error != 0) 196 return (error); 197 198 for (i = 0; i < NUMFPREGS; i++) 199 fpregs->r_regs[i] = fp.r_regs[i]; 200 201 return (0); 202 } 203 204 static int 205 get_mcontext32(struct thread *td, mcontext32_t *mcp, int flags) 206 { 207 mcontext_t mcp64; 208 unsigned i; 209 int error; 210 211 error = get_mcontext(td, &mcp64, flags); 212 if (error != 0) 213 return (error); 214 215 mcp->mc_onstack = mcp64.mc_onstack; 216 mcp->mc_pc = mcp64.mc_pc; 217 for (i = 0; i < 32; i++) 218 mcp->mc_regs[i] = mcp64.mc_regs[i]; 219 mcp->sr = mcp64.sr; 220 mcp->mullo = mcp64.mullo; 221 mcp->mulhi = mcp64.mulhi; 222 mcp->mc_fpused = mcp64.mc_fpused; 223 for (i = 0; i < 33; i++) 224 mcp->mc_fpregs[i] = mcp64.mc_fpregs[i]; 225 mcp->mc_fpc_eir = mcp64.mc_fpc_eir; 226 mcp->mc_tls = (int32_t)(intptr_t)mcp64.mc_tls; 227 228 return (0); 229 } 230 231 static int 232 set_mcontext32(struct thread *td, mcontext32_t *mcp) 233 { 234 mcontext_t mcp64; 235 unsigned i; 236 237 mcp64.mc_onstack = mcp->mc_onstack; 238 mcp64.mc_pc = mcp->mc_pc; 239 for (i = 0; i < 32; i++) 240 mcp64.mc_regs[i] = mcp->mc_regs[i]; 241 mcp64.sr = mcp->sr; 242 mcp64.mullo = mcp->mullo; 243 mcp64.mulhi = mcp->mulhi; 244 mcp64.mc_fpused = mcp->mc_fpused; 245 for (i = 0; i < 33; i++) 246 mcp64.mc_fpregs[i] = mcp->mc_fpregs[i]; 247 mcp64.mc_fpc_eir = mcp->mc_fpc_eir; 248 mcp64.mc_tls = (void *)(intptr_t)mcp->mc_tls; 249 250 return (set_mcontext(td, &mcp64)); 251 } 252 253 int 254 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 255 { 256 ucontext32_t uc; 257 int error; 258 259 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 260 261 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 262 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 263 return (EFAULT); 264 } 265 266 error = set_mcontext32(td, &uc.uc_mcontext); 267 if (error != 0) 268 return (error); 269 270 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 271 272 #if 0 273 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 274 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 275 #endif 276 277 return (EJUSTRETURN); 278 } 279 280 /* 281 * The first two fields of a ucontext_t are the signal mask and the machine 282 * context. The next field is uc_link; we want to avoid destroying the link 283 * when copying out contexts. 284 */ 285 #define UC32_COPY_SIZE offsetof(ucontext32_t, uc_link) 286 287 int 288 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 289 { 290 ucontext32_t uc; 291 int ret; 292 293 if (uap->ucp == NULL) 294 ret = EINVAL; 295 else { 296 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 297 PROC_LOCK(td->td_proc); 298 uc.uc_sigmask = td->td_sigmask; 299 PROC_UNLOCK(td->td_proc); 300 ret = copyout(&uc, uap->ucp, UC32_COPY_SIZE); 301 } 302 return (ret); 303 } 304 305 int 306 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 307 { 308 ucontext32_t uc; 309 int ret; 310 311 if (uap->ucp == NULL) 312 ret = EINVAL; 313 else { 314 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 315 if (ret == 0) { 316 ret = set_mcontext32(td, &uc.uc_mcontext); 317 if (ret == 0) { 318 kern_sigprocmask(td, SIG_SETMASK, 319 &uc.uc_sigmask, NULL, 0); 320 } 321 } 322 } 323 return (ret == 0 ? EJUSTRETURN : ret); 324 } 325 326 int 327 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 328 { 329 ucontext32_t uc; 330 int ret; 331 332 if (uap->oucp == NULL || uap->ucp == NULL) 333 ret = EINVAL; 334 else { 335 get_mcontext32(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 336 PROC_LOCK(td->td_proc); 337 uc.uc_sigmask = td->td_sigmask; 338 PROC_UNLOCK(td->td_proc); 339 ret = copyout(&uc, uap->oucp, UC32_COPY_SIZE); 340 if (ret == 0) { 341 ret = copyin(uap->ucp, &uc, UC32_COPY_SIZE); 342 if (ret == 0) { 343 ret = set_mcontext32(td, &uc.uc_mcontext); 344 if (ret == 0) { 345 kern_sigprocmask(td, SIG_SETMASK, 346 &uc.uc_sigmask, NULL, 0); 347 } 348 } 349 } 350 } 351 return (ret == 0 ? EJUSTRETURN : ret); 352 } 353 354 #define UCONTEXT_MAGIC 0xACEDBADE 355 356 /* 357 * Send an interrupt to process. 358 * 359 * Stack is set up to allow sigcode stored 360 * at top to call routine, followed by kcall 361 * to sigreturn routine below. After sigreturn 362 * resets the signal mask, the stack, and the 363 * frame pointer, it returns to the user 364 * specified pc, psl. 365 */ 366 static void 367 freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 368 { 369 struct proc *p; 370 struct thread *td; 371 struct fpreg32 fpregs; 372 struct reg32 regs; 373 struct sigacts *psp; 374 struct sigframe32 sf, *sfp; 375 int sig; 376 int oonstack; 377 unsigned i; 378 379 td = curthread; 380 p = td->td_proc; 381 PROC_LOCK_ASSERT(p, MA_OWNED); 382 sig = ksi->ksi_signo; 383 psp = p->p_sigacts; 384 mtx_assert(&psp->ps_mtx, MA_OWNED); 385 386 fill_regs32(td, ®s); 387 oonstack = sigonstack(td->td_frame->sp); 388 389 /* save user context */ 390 bzero(&sf, sizeof sf); 391 sf.sf_uc.uc_sigmask = *mask; 392 sf.sf_uc.uc_stack.ss_sp = (int32_t)(intptr_t)td->td_sigstk.ss_sp; 393 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 394 sf.sf_uc.uc_stack.ss_flags = td->td_sigstk.ss_flags; 395 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 396 sf.sf_uc.uc_mcontext.mc_pc = regs.r_regs[PC]; 397 sf.sf_uc.uc_mcontext.mullo = regs.r_regs[MULLO]; 398 sf.sf_uc.uc_mcontext.mulhi = regs.r_regs[MULHI]; 399 sf.sf_uc.uc_mcontext.mc_tls = (int32_t)(intptr_t)td->td_md.md_tls; 400 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */ 401 for (i = 1; i < 32; i++) 402 sf.sf_uc.uc_mcontext.mc_regs[i] = regs.r_regs[i]; 403 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED; 404 if (sf.sf_uc.uc_mcontext.mc_fpused) { 405 /* if FPU has current state, save it first */ 406 if (td == PCPU_GET(fpcurthread)) 407 MipsSaveCurFPState(td); 408 fill_fpregs32(td, &fpregs); 409 for (i = 0; i < 33; i++) 410 sf.sf_uc.uc_mcontext.mc_fpregs[i] = fpregs.r_regs[i]; 411 } 412 413 /* Allocate and validate space for the signal handler context. */ 414 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 415 SIGISMEMBER(psp->ps_sigonstack, sig)) { 416 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_sigstk.ss_sp + 417 td->td_sigstk.ss_size - sizeof(struct sigframe32)) 418 & ~(sizeof(__int64_t) - 1)); 419 } else 420 sfp = (struct sigframe32 *)((vm_offset_t)(td->td_frame->sp - 421 sizeof(struct sigframe32)) & ~(sizeof(__int64_t) - 1)); 422 423 /* Build the argument list for the signal handler. */ 424 td->td_frame->a0 = sig; 425 td->td_frame->a2 = (register_t)(intptr_t)&sfp->sf_uc; 426 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 427 /* Signal handler installed with SA_SIGINFO. */ 428 td->td_frame->a1 = (register_t)(intptr_t)&sfp->sf_si; 429 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */ 430 431 /* fill siginfo structure */ 432 sf.sf_si.si_signo = sig; 433 sf.sf_si.si_code = ksi->ksi_code; 434 sf.sf_si.si_addr = td->td_frame->badvaddr; 435 } else { 436 /* Old FreeBSD-style arguments. */ 437 td->td_frame->a1 = ksi->ksi_code; 438 td->td_frame->a3 = td->td_frame->badvaddr; 439 /* sf.sf_ahu.sf_handler = catcher; */ 440 } 441 442 mtx_unlock(&psp->ps_mtx); 443 PROC_UNLOCK(p); 444 445 /* 446 * Copy the sigframe out to the user's stack. 447 */ 448 if (copyout(&sf, sfp, sizeof(struct sigframe32)) != 0) { 449 /* 450 * Something is wrong with the stack pointer. 451 * ...Kill the process. 452 */ 453 PROC_LOCK(p); 454 sigexit(td, SIGILL); 455 } 456 457 td->td_frame->pc = (register_t)(intptr_t)catcher; 458 td->td_frame->t9 = (register_t)(intptr_t)catcher; 459 td->td_frame->sp = (register_t)(intptr_t)sfp; 460 /* 461 * Signal trampoline code is at base of user stack. 462 */ 463 td->td_frame->ra = (register_t)(intptr_t)FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 464 PROC_LOCK(p); 465 mtx_lock(&psp->ps_mtx); 466 } 467 468 int 469 freebsd32_sysarch(struct thread *td, struct freebsd32_sysarch_args *uap) 470 { 471 int error; 472 int32_t tlsbase; 473 474 switch (uap->op) { 475 case MIPS_SET_TLS: 476 td->td_md.md_tls = (void *)(intptr_t)uap->parms; 477 return (0); 478 case MIPS_GET_TLS: 479 tlsbase = (int32_t)(intptr_t)td->td_md.md_tls; 480 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase)); 481 return (error); 482 default: 483 break; 484 } 485 return (EINVAL); 486 } 487 488 void 489 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 490 size_t *off __unused) 491 { 492 }
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