1 /* $NetBSD: trap.c,v 1.12 2003/02/07 04:39:09 thorpej Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 40 * Copyright (C) 1995, 1996 TooLs GmbH. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by TooLs GmbH. 54 * 4. The name of TooLs GmbH may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 61 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 62 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 63 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 64 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 65 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 66 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 #include "opt_altivec.h" 70 #include "opt_ddb.h" 71 #include "opt_ktrace.h" 72 #include "opt_systrace.h" 73 #include "opt_syscall_debug.h" 74 75 #include <sys/param.h> 76 #include <sys/proc.h> 77 #include <sys/reboot.h> 78 #include <sys/syscall.h> 79 #include <sys/systm.h> 80 #include <sys/user.h> 81 #ifdef KTRACE 82 #include <sys/ktrace.h> 83 #endif 84 #include <sys/pool.h> 85 #include <sys/sa.h> 86 #include <sys/savar.h> 87 #ifdef SYSTRACE 88 #include <sys/systrace.h> 89 #endif 90 91 #include <uvm/uvm_extern.h> 92 93 #include <dev/cons.h> 94 95 #include <machine/cpu.h> 96 #include <machine/db_machdep.h> 97 #include <machine/fpu.h> 98 #include <machine/frame.h> 99 #include <machine/pcb.h> 100 #include <machine/psl.h> 101 #include <machine/trap.h> 102 103 #include <powerpc/spr.h> 104 #include <powerpc/ibm4xx/pmap.h> 105 #include <powerpc/ibm4xx/tlb.h> 106 #include <powerpc/fpu/fpu_extern.h> 107 108 /* These definitions should probably be somewhere else XXX */ 109 #define FIRSTARG 3 /* first argument is in reg 3 */ 110 #define NARGREG 8 /* 8 args are in registers */ 111 #define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */ 112 113 static int fix_unaligned __P((struct lwp *l, struct trapframe *frame)); 114 115 void trap __P((struct trapframe *)); /* Called from locore / trap_subr */ 116 /* Why are these not defined in a header? */ 117 int badaddr __P((void *, size_t)); 118 int badaddr_read __P((void *, size_t, int *)); 119 int ctx_setup __P((int, int)); 120 121 #ifdef DEBUG 122 #define TDB_ALL 0x1 123 int trapdebug = /* TDB_ALL */ 0; 124 #define DBPRINTF(x, y) if (trapdebug & (x)) printf y 125 #else 126 #define DBPRINTF(x, y) 127 #endif 128 129 void 130 trap(struct trapframe *frame) 131 { 132 struct lwp *l = curlwp; 133 struct proc *p = l ? l->l_proc : NULL; 134 int type = frame->exc; 135 int ftype, rv; 136 137 KASSERT(l == 0 || (l->l_stat == LSONPROC)); 138 139 if (frame->srr1 & PSL_PR) 140 type |= EXC_USER; 141 142 ftype = VM_PROT_READ; 143 144 DBPRINTF(TDB_ALL, ("trap(%x) at %lx from frame %p &frame %p\n", 145 type, frame->srr0, frame, &frame)); 146 147 switch (type) { 148 case EXC_DEBUG|EXC_USER: 149 { 150 int srr2, srr3; 151 __asm __volatile("mfspr %0,0x3f0" : "=r" (rv), "=r" (srr2), "=r" (srr3) :); 152 printf("debug reg is %x srr2 %x srr3 %x\n", rv, srr2, srr3); 153 } 154 /* 155 * DEBUG intr -- probably single-step. 156 */ 157 case EXC_TRC|EXC_USER: 158 KERNEL_PROC_LOCK(l); 159 frame->srr1 &= ~PSL_SE; 160 trapsignal(l, SIGTRAP, EXC_TRC); 161 KERNEL_PROC_UNLOCK(l); 162 break; 163 164 /* If we could not find and install appropriate TLB entry, fall through */ 165 166 case EXC_DSI: 167 /* FALLTHROUGH */ 168 case EXC_DTMISS: 169 { 170 struct vm_map *map; 171 vaddr_t va; 172 struct faultbuf *fb = NULL; 173 174 KERNEL_LOCK(LK_CANRECURSE|LK_EXCLUSIVE); 175 va = frame->dar; 176 if (frame->tf_xtra[TF_PID] == KERNEL_PID) { 177 map = kernel_map; 178 } else { 179 map = &p->p_vmspace->vm_map; 180 } 181 182 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 183 ftype = VM_PROT_WRITE; 184 185 DBPRINTF(TDB_ALL, ("trap(EXC_DSI) at %lx %s fault on %p esr %x\n", 186 frame->srr0, (ftype&VM_PROT_WRITE) ? "write" : "read", (void *)va, frame->tf_xtra[TF_ESR])); 187 rv = uvm_fault(map, trunc_page(va), 0, ftype); 188 KERNEL_UNLOCK(); 189 if (rv == 0) 190 goto done; 191 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 192 frame->tf_xtra[TF_PID] = KERNEL_PID; 193 frame->srr0 = fb->fb_pc; 194 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 195 frame->fixreg[1] = fb->fb_sp; 196 frame->fixreg[2] = fb->fb_r2; 197 frame->fixreg[3] = 1; /* Return TRUE */ 198 frame->cr = fb->fb_cr; 199 memcpy(&frame->fixreg[13], fb->fb_fixreg, 200 sizeof(fb->fb_fixreg)); 201 goto done; 202 } 203 } 204 goto brain_damage; 205 206 case EXC_DSI|EXC_USER: 207 /* FALLTHROUGH */ 208 case EXC_DTMISS|EXC_USER: 209 KERNEL_PROC_LOCK(l); 210 211 if (frame->tf_xtra[TF_ESR] & (ESR_DST|ESR_DIZ)) 212 ftype = VM_PROT_WRITE; 213 214 DBPRINTF(TDB_ALL, ("trap(EXC_DSI|EXC_USER) at %lx %s fault on %lx %x\n", 215 frame->srr0, (ftype&VM_PROT_WRITE) ? "write" : "read", frame->dar, frame->tf_xtra[TF_ESR])); 216 KASSERT(l == curlwp && (l->l_stat == LSONPROC)); 217 rv = uvm_fault(&p->p_vmspace->vm_map, 218 trunc_page(frame->dar), 0, ftype); 219 if (rv == 0) { 220 KERNEL_PROC_UNLOCK(l); 221 break; 222 } 223 if (rv == ENOMEM) { 224 printf("UVM: pid %d (%s) lid %d, uid %d killed: " 225 "out of swap\n", 226 p->p_pid, p->p_comm, l->l_lid, 227 p->p_cred && p->p_ucred ? 228 p->p_ucred->cr_uid : -1); 229 trapsignal(l, SIGKILL, EXC_DSI); 230 } else { 231 trapsignal(l, SIGSEGV, EXC_DSI); 232 } 233 KERNEL_PROC_UNLOCK(l); 234 break; 235 case EXC_ITMISS|EXC_USER: 236 case EXC_ISI|EXC_USER: 237 KERNEL_PROC_LOCK(l); 238 ftype = VM_PROT_READ | VM_PROT_EXECUTE; 239 DBPRINTF(TDB_ALL, ("trap(EXC_ISI|EXC_USER) at %lx %s fault on %lx tf %p\n", 240 frame->srr0, (ftype&VM_PROT_WRITE) ? "write" : "read", frame->srr0, frame)); 241 rv = uvm_fault(&p->p_vmspace->vm_map, trunc_page(frame->srr0), 0, ftype); 242 if (rv == 0) { 243 KERNEL_PROC_UNLOCK(l); 244 break; 245 } 246 trapsignal(l, SIGSEGV, EXC_ISI); 247 KERNEL_PROC_UNLOCK(l); 248 break; 249 250 case EXC_AST|EXC_USER: 251 curcpu()->ci_astpending = 0; /* we are about to do it */ 252 KERNEL_PROC_LOCK(l); 253 uvmexp.softs++; 254 if (p->p_flag & P_OWEUPC) { 255 p->p_flag &= ~P_OWEUPC; 256 ADDUPROF(p); 257 } 258 /* Check whether we are being preempted. */ 259 if (curcpu()->ci_want_resched) 260 preempt(0); 261 KERNEL_PROC_UNLOCK(l); 262 break; 263 264 265 case EXC_ALI|EXC_USER: 266 KERNEL_PROC_LOCK(l); 267 if (fix_unaligned(l, frame) != 0) 268 trapsignal(l, SIGBUS, EXC_ALI); 269 else 270 frame->srr0 += 4; 271 KERNEL_PROC_UNLOCK(l); 272 break; 273 274 case EXC_PGM|EXC_USER: 275 /* 276 * Illegal insn: 277 * 278 * let's try to see if it's FPU and can be emulated. 279 */ 280 uvmexp.traps ++; 281 if (!(l->l_addr->u_pcb.pcb_flags & PCB_FPU)) { 282 memset(&l->l_addr->u_pcb.pcb_fpu, 0, 283 sizeof l->l_addr->u_pcb.pcb_fpu); 284 l->l_addr->u_pcb.pcb_flags |= PCB_FPU; 285 } 286 287 if ((rv = fpu_emulate(frame, 288 (struct fpreg *)&l->l_addr->u_pcb.pcb_fpu))) { 289 KERNEL_PROC_LOCK(l); 290 trapsignal(l, rv, EXC_PGM); 291 KERNEL_PROC_UNLOCK(l); 292 } 293 break; 294 295 case EXC_MCHK: 296 { 297 struct faultbuf *fb; 298 299 if ((fb = l->l_addr->u_pcb.pcb_onfault) != NULL) { 300 frame->tf_xtra[TF_PID] = KERNEL_PID; 301 frame->srr0 = fb->fb_pc; 302 frame->srr1 |= PSL_IR; /* Re-enable IMMU */ 303 frame->fixreg[1] = fb->fb_sp; 304 frame->fixreg[2] = fb->fb_r2; 305 frame->fixreg[3] = 1; /* Return TRUE */ 306 frame->cr = fb->fb_cr; 307 memcpy(&frame->fixreg[13], fb->fb_fixreg, 308 sizeof(fb->fb_fixreg)); 309 goto done; 310 } 311 } 312 goto brain_damage; 313 default: 314 brain_damage: 315 printf("trap type 0x%x at 0x%lx\n", type, frame->srr0); 316 #ifdef DDB 317 if (kdb_trap(type, frame)) 318 goto done; 319 #endif 320 #ifdef TRAP_PANICWAIT 321 printf("Press a key to panic.\n"); 322 cngetc(); 323 #endif 324 panic("trap"); 325 } 326 327 /* Take pending signals. */ 328 { 329 int sig; 330 331 while ((sig = CURSIG(l)) != 0) 332 postsig(sig); 333 } 334 335 /* Invoke per-process kernel-exit handling, if any */ 336 if (p->p_userret) 337 (p->p_userret)(l, p->p_userret_arg); 338 339 /* Invoke any pending upcalls */ 340 while (l->l_flag & L_SA_UPCALL) 341 sa_upcall_userret(l); 342 343 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 344 done: 345 return; 346 } 347 348 int 349 ctx_setup(int ctx, int srr1) 350 { 351 volatile struct pmap *pm; 352 353 /* Update PID if we're returning to user mode. */ 354 if (srr1 & PSL_PR) { 355 pm = curproc->p_vmspace->vm_map.pmap; 356 if (!pm->pm_ctx) { 357 ctx_alloc((struct pmap *)pm); 358 } 359 ctx = pm->pm_ctx; 360 if (srr1 & PSL_SE) { 361 int dbreg, mask = 0x48000000; 362 /* 363 * Set the Internal Debug and 364 * Instruction Completion bits of 365 * the DBCR0 register. 366 * 367 * XXX this is also used by jtag debuggers... 368 */ 369 __asm __volatile("mfspr %0,0x3f2;" 370 "or %0,%0,%1;" 371 "mtspr 0x3f2,%0;" : 372 "=&r" (dbreg) : "r" (mask)); 373 } 374 } 375 else if (!ctx) { 376 ctx = KERNEL_PID; 377 } 378 return (ctx); 379 } 380 381 /* 382 * Used by copyin()/copyout() 383 */ 384 extern vaddr_t vmaprange __P((struct proc *, vaddr_t, vsize_t, int)); 385 extern void vunmaprange __P((vaddr_t, vsize_t)); 386 static int bigcopyin __P((const void *, void *, size_t )); 387 static int bigcopyout __P((const void *, void *, size_t )); 388 389 int 390 copyin(const void *udaddr, void *kaddr, size_t len) 391 { 392 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 393 int msr, pid, tmp, ctx; 394 struct faultbuf env; 395 396 /* For bigger buffers use the faster copy */ 397 if (len > 256) return (bigcopyin(udaddr, kaddr, len)); 398 399 if (setfault(&env)) { 400 curpcb->pcb_onfault = 0; 401 return EFAULT; 402 } 403 404 if (!(ctx = pm->pm_ctx)) { 405 /* No context -- assign it one */ 406 ctx_alloc(pm); 407 ctx = pm->pm_ctx; 408 } 409 410 asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 411 "mfmsr %0;" /* Save MSR */ 412 "li %1,0x20; " 413 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 414 "mfpid %1;" /* Save old PID */ 415 "sync; isync;" 416 417 "1: bdz 2f;" /* while len */ 418 "mtpid %3; sync;" /* Load user ctx */ 419 "lbz %2,0(%4); addi %4,%4,1;" /* Load byte */ 420 "sync; isync;" 421 "mtpid %1;sync;" 422 "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Store kernel byte */ 423 "sync; isync;" 424 "b 1b;" /* repeat */ 425 426 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 427 "sync; isync;" 428 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 429 : "r" (ctx), "r" (udaddr), "r" (kaddr), "r" (len)); 430 431 curpcb->pcb_onfault = 0; 432 return 0; 433 } 434 435 static int 436 bigcopyin(const void *udaddr, void *kaddr, size_t len) 437 { 438 const char *up; 439 char *kp = kaddr; 440 struct lwp *l = curlwp; 441 struct proc *p; 442 int error; 443 444 if (!l) { 445 return EFAULT; 446 } 447 448 p = l->l_proc; 449 450 /* 451 * Stolen from physio(): 452 */ 453 PHOLD(l); 454 error = uvm_vslock(p, (caddr_t)udaddr, len, VM_PROT_READ); 455 if (error) { 456 PRELE(l); 457 return EFAULT; 458 } 459 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, VM_PROT_READ); 460 461 memcpy(kp, up, len); 462 vunmaprange((vaddr_t)up, len); 463 uvm_vsunlock(p, (caddr_t)udaddr, len); 464 PRELE(l); 465 466 return 0; 467 } 468 469 int 470 copyout(const void *kaddr, void *udaddr, size_t len) 471 { 472 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 473 int msr, pid, tmp, ctx; 474 struct faultbuf env; 475 476 /* For big copies use more efficient routine */ 477 if (len > 256) return (bigcopyout(kaddr, udaddr, len)); 478 479 if (setfault(&env)) { 480 curpcb->pcb_onfault = 0; 481 return EFAULT; 482 } 483 484 if (!(ctx = pm->pm_ctx)) { 485 /* No context -- assign it one */ 486 ctx_alloc(pm); 487 ctx = pm->pm_ctx; 488 } 489 490 asm volatile("addi %6,%6,1; mtctr %6;" /* Set up counter */ 491 "mfmsr %0;" /* Save MSR */ 492 "li %1,0x20; " 493 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 494 "mfpid %1;" /* Save old PID */ 495 "sync; isync;" 496 497 "1: bdz 2f;" /* while len */ 498 "mtpid %1;sync;" 499 "lbz %2,0(%5); addi %5,%5,1;" /* Load kernel byte */ 500 "sync; isync;" 501 "mtpid %3; sync;" /* Load user ctx */ 502 "stb %2,0(%4); dcbf 0,%4; addi %4,%4,1;" /* Store user byte */ 503 "sync; isync;" 504 "b 1b;" /* repeat */ 505 506 "2: mtpid %1; mtmsr %0;" /* Restore PID and MSR */ 507 "sync; isync;" 508 : "=&r" (msr), "=&r" (pid), "=&r" (tmp) 509 : "r" (ctx), "r" (udaddr), "r" (kaddr), "r" (len)); 510 511 curpcb->pcb_onfault = 0; 512 return 0; 513 } 514 515 static int 516 bigcopyout(const void *kaddr, void *udaddr, size_t len) 517 { 518 char *up; 519 const char *kp = (char *)kaddr; 520 struct lwp *l = curlwp; 521 struct proc *p; 522 int error; 523 524 if (!l) { 525 return EFAULT; 526 } 527 528 p = l->l_proc; 529 530 /* 531 * Stolen from physio(): 532 */ 533 PHOLD(l); 534 error = uvm_vslock(p, udaddr, len, VM_PROT_WRITE); 535 if (error) { 536 PRELE(l); 537 return EFAULT; 538 } 539 up = (char *)vmaprange(p, (vaddr_t)udaddr, len, 540 VM_PROT_READ|VM_PROT_WRITE); 541 542 memcpy(up, kp, len); 543 vunmaprange((vaddr_t)up, len); 544 uvm_vsunlock(p, udaddr, len); 545 PRELE(l); 546 547 return 0; 548 } 549 550 /* 551 * kcopy(const void *src, void *dst, size_t len); 552 * 553 * Copy len bytes from src to dst, aborting if we encounter a fatal 554 * page fault. 555 * 556 * kcopy() _must_ save and restore the old fault handler since it is 557 * called by uiomove(), which may be in the path of servicing a non-fatal 558 * page fault. 559 */ 560 int 561 kcopy(const void *src, void *dst, size_t len) 562 { 563 struct faultbuf env, *oldfault; 564 565 oldfault = curpcb->pcb_onfault; 566 if (setfault(&env)) { 567 curpcb->pcb_onfault = oldfault; 568 return EFAULT; 569 } 570 571 memcpy(dst, src, len); 572 573 curpcb->pcb_onfault = oldfault; 574 return 0; 575 } 576 577 int 578 badaddr(void *addr, size_t size) 579 { 580 581 return badaddr_read(addr, size, NULL); 582 } 583 584 int 585 badaddr_read(void *addr, size_t size, int *rptr) 586 { 587 struct faultbuf env; 588 int x; 589 590 /* Get rid of any stale machine checks that have been waiting. */ 591 __asm __volatile ("sync; isync"); 592 593 if (setfault(&env)) { 594 curpcb->pcb_onfault = 0; 595 __asm __volatile ("sync"); 596 return 1; 597 } 598 599 __asm __volatile ("sync"); 600 601 switch (size) { 602 case 1: 603 x = *(volatile int8_t *)addr; 604 break; 605 case 2: 606 x = *(volatile int16_t *)addr; 607 break; 608 case 4: 609 x = *(volatile int32_t *)addr; 610 break; 611 default: 612 panic("badaddr: invalid size (%d)", size); 613 } 614 615 /* Make sure we took the machine check, if we caused one. */ 616 __asm __volatile ("sync; isync"); 617 618 curpcb->pcb_onfault = 0; 619 __asm __volatile ("sync"); /* To be sure. */ 620 621 /* Use the value to avoid reorder. */ 622 if (rptr) 623 *rptr = x; 624 625 return 0; 626 } 627 628 /* 629 * For now, this only deals with the particular unaligned access case 630 * that gcc tends to generate. Eventually it should handle all of the 631 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 632 */ 633 634 static int 635 fix_unaligned(struct lwp *l, struct trapframe *frame) 636 { 637 638 return -1; 639 } 640 641 /* 642 * Start a new LWP 643 */ 644 void 645 startlwp(arg) 646 void *arg; 647 { 648 int err; 649 ucontext_t *uc = arg; 650 struct lwp *l = curlwp; 651 652 err = cpu_setmcontext(l, &uc->uc_mcontext, uc->uc_flags); 653 #if DIAGNOSTIC 654 if (err) { 655 printf("Error %d from cpu_setmcontext.", err); 656 } 657 #endif 658 pool_put(&lwp_uc_pool, uc); 659 660 upcallret(l); 661 } 662 663 /* 664 * XXX This is a terrible name. 665 */ 666 void 667 upcallret(l) 668 struct lwp *l; 669 { 670 int sig; 671 672 /* Take pending signals. */ 673 while ((sig = CURSIG(l)) != 0) 674 postsig(sig); 675 676 /* Invoke per-process kernel-exit handling, if any */ 677 if (l->l_proc->p_userret) 678 (l->l_proc->p_userret)(l, l->l_proc->p_userret_arg); 679 680 /* Invoke any pending upcalls */ 681 while (l->l_flag & L_SA_UPCALL) 682 sa_upcall_userret(l); 683 684 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 685 } 686