1 /* 2 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 3 * Copyright (C) 1995, 1996 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /* 32 * Copyright (C) 2001 Benno Rice 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 44 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 45 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 49 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 50 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 51 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 52 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 53 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 * $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $ 55 */ 56 57 #include <sys/cdefs.h> 58 __FBSDID("$FreeBSD$"); 59 60 #include "opt_compat.h" 61 #include "opt_kstack_pages.h" 62 #include "opt_msgbuf.h" 63 64 #include <sys/param.h> 65 #include <sys/systm.h> 66 #include <sys/kdb.h> 67 #include <sys/eventhandler.h> 68 #include <sys/imgact.h> 69 #include <sys/sysproto.h> 70 #include <sys/lock.h> 71 #include <sys/mutex.h> 72 #include <sys/ktr.h> 73 #include <sys/signalvar.h> 74 #include <sys/kernel.h> 75 #include <sys/proc.h> 76 #include <sys/malloc.h> 77 #include <sys/reboot.h> 78 #include <sys/bio.h> 79 #include <sys/buf.h> 80 #include <sys/bus.h> 81 #include <sys/mbuf.h> 82 #include <sys/vmmeter.h> 83 #include <sys/msgbuf.h> 84 #include <sys/exec.h> 85 #include <sys/sysctl.h> 86 #include <sys/uio.h> 87 #include <sys/linker.h> 88 #include <sys/cons.h> 89 #include <sys/ucontext.h> 90 #include <sys/sysent.h> 91 #include <net/netisr.h> 92 #include <vm/vm.h> 93 #include <vm/vm_kern.h> 94 #include <vm/vm_page.h> 95 #include <vm/vm_map.h> 96 #include <vm/vm_extern.h> 97 #include <vm/vm_object.h> 98 #include <vm/vm_pager.h> 99 #include <sys/user.h> 100 #include <sys/ptrace.h> 101 #include <machine/bat.h> 102 #include <machine/clock.h> 103 #include <machine/cpu.h> 104 #include <machine/md_var.h> 105 #include <machine/metadata.h> 106 #include <machine/reg.h> 107 #include <machine/fpu.h> 108 #include <machine/vmparam.h> 109 #include <machine/elf.h> 110 #include <machine/trap.h> 111 #include <machine/powerpc.h> 112 #include <dev/ofw/openfirm.h> 113 #include <sys/vnode.h> 114 #include <machine/sigframe.h> 115 116 #include <ddb/ddb.h> 117 118 int cold = 1; 119 120 char pcpu0[PAGE_SIZE]; 121 char uarea0[UAREA_PAGES * PAGE_SIZE]; 122 struct trapframe frame0; 123 124 vm_offset_t kstack0; 125 vm_offset_t kstack0_phys; 126 127 char machine[] = "powerpc"; 128 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 129 130 static char model[128]; 131 SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, model, 0, ""); 132 133 static int cacheline_size = CACHELINESIZE; 134 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 135 CTLFLAG_RD, &cacheline_size, 0, ""); 136 137 static void cpu_startup(void *); 138 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 139 140 void powerpc_init(u_int, u_int, u_int, void *); 141 142 int save_ofw_mapping(void); 143 int restore_ofw_mapping(void); 144 145 void install_extint(void (*)(void)); 146 147 int setfault(faultbuf); /* defined in locore.S */ 148 149 static int grab_mcontext(struct thread *, mcontext_t *, int); 150 151 void asm_panic(char *); 152 153 long Maxmem = 0; 154 155 struct pmap ofw_pmap; 156 extern int ofmsr; 157 158 struct bat battable[16]; 159 160 struct kva_md_info kmi; 161 162 static void 163 powerpc_ofw_shutdown(void *junk, int howto) 164 { 165 if (howto & RB_HALT) { 166 OF_halt(); 167 } 168 OF_reboot(); 169 } 170 171 static void 172 cpu_startup(void *dummy) 173 { 174 175 /* 176 * Initialise the decrementer-based clock. 177 */ 178 decr_init(); 179 180 /* 181 * Good {morning,afternoon,evening,night}. 182 */ 183 cpu_setup(PCPU_GET(cpuid)); 184 185 /* startrtclock(); */ 186 #ifdef PERFMON 187 perfmon_init(); 188 #endif 189 printf("real memory = %ld (%ld MB)\n", ptoa(Maxmem), 190 ptoa(Maxmem) / 1048576); 191 192 /* 193 * Display any holes after the first chunk of extended memory. 194 */ 195 if (bootverbose) { 196 int indx; 197 198 printf("Physical memory chunk(s):\n"); 199 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 200 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 201 202 printf("0x%08x - 0x%08x, %d bytes (%d pages)\n", 203 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 204 size1 / PAGE_SIZE); 205 } 206 } 207 208 vm_ksubmap_init(&kmi); 209 210 printf("avail memory = %ld (%ld MB)\n", ptoa(cnt.v_free_count), 211 ptoa(cnt.v_free_count) / 1048576); 212 213 /* 214 * Set up buffers, so they can be used to read disk labels. 215 */ 216 bufinit(); 217 vm_pager_bufferinit(); 218 219 EVENTHANDLER_REGISTER(shutdown_final, powerpc_ofw_shutdown, 0, 220 SHUTDOWN_PRI_LAST); 221 222 #ifdef SMP 223 /* 224 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 225 */ 226 mp_start(); /* fire up the secondaries */ 227 mp_announce(); 228 #endif /* SMP */ 229 } 230 231 extern char kernel_text[], _end[]; 232 233 extern void *trapcode, *trapsize; 234 extern void *alitrap, *alisize; 235 extern void *dsitrap, *dsisize; 236 extern void *decrint, *decrsize; 237 extern void *extint, *extsize; 238 extern void *dblow, *dbsize; 239 240 void 241 powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp) 242 { 243 struct pcpu *pc; 244 vm_offset_t end, off; 245 void *kmdp; 246 247 end = 0; 248 kmdp = NULL; 249 250 /* 251 * Parse metadata if present and fetch parameters. Must be done 252 * before console is inited so cninit gets the right value of 253 * boothowto. 254 */ 255 if (mdp != NULL) { 256 preload_metadata = mdp; 257 kmdp = preload_search_by_type("elf kernel"); 258 if (kmdp != NULL) { 259 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 260 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); 261 end = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t); 262 } 263 } 264 265 /* 266 * Init params/tunables that can be overridden by the loader 267 */ 268 init_param1(); 269 270 /* 271 * Start initializing proc0 and thread0. 272 */ 273 proc_linkup(&proc0, &ksegrp0, &kse0, &thread0); 274 proc0.p_uarea = (struct user *)uarea0; 275 proc0.p_stats = &proc0.p_uarea->u_stats; 276 thread0.td_frame = &frame0; 277 278 /* 279 * Set up per-cpu data. 280 */ 281 pc = (struct pcpu *)(pcpu0 + PAGE_SIZE) - 1; 282 pcpu_init(pc, 0, sizeof(struct pcpu)); 283 pc->pc_curthread = &thread0; 284 pc->pc_curpcb = thread0.td_pcb; 285 pc->pc_cpuid = 0; 286 /* pc->pc_mid = mid; */ 287 288 __asm __volatile("mtsprg 0, %0" :: "r"(pc)); 289 290 mutex_init(); 291 292 /* 293 * Initialize the console before printing anything. 294 */ 295 cninit(); 296 297 /* 298 * Complain if there is no metadata. 299 */ 300 if (mdp == NULL || kmdp == NULL) { 301 printf("powerpc_init: no loader metadata.\n"); 302 } 303 304 kdb_init(); 305 306 /* 307 * XXX: Initialize the interrupt tables. 308 * Disable translation in case the vector area 309 * hasn't been mapped (G5) 310 */ 311 mtmsr(mfmsr() & ~(PSL_IR | PSL_DR)); 312 isync(); 313 bcopy(&trapcode, (void *)EXC_RST, (size_t)&trapsize); 314 bcopy(&trapcode, (void *)EXC_MCHK, (size_t)&trapsize); 315 bcopy(&dsitrap, (void *)EXC_DSI, (size_t)&dsisize); 316 bcopy(&trapcode, (void *)EXC_ISI, (size_t)&trapsize); 317 bcopy(&trapcode, (void *)EXC_EXI, (size_t)&trapsize); 318 bcopy(&trapcode, (void *)EXC_ALI, (size_t)&trapsize); 319 bcopy(&trapcode, (void *)EXC_PGM, (size_t)&trapsize); 320 bcopy(&trapcode, (void *)EXC_FPU, (size_t)&trapsize); 321 bcopy(&trapcode, (void *)EXC_DECR, (size_t)&trapsize); 322 bcopy(&trapcode, (void *)EXC_SC, (size_t)&trapsize); 323 bcopy(&trapcode, (void *)EXC_TRC, (size_t)&trapsize); 324 bcopy(&trapcode, (void *)EXC_FPA, (size_t)&trapsize); 325 bcopy(&trapcode, (void *)EXC_THRM, (size_t)&trapsize); 326 bcopy(&trapcode, (void *)EXC_BPT, (size_t)&trapsize); 327 #ifdef KDB 328 bcopy(&dblow, (void *)EXC_RST, (size_t)&dbsize); 329 bcopy(&dblow, (void *)EXC_MCHK, (size_t)&dbsize); 330 bcopy(&dblow, (void *)EXC_PGM, (size_t)&dbsize); 331 bcopy(&dblow, (void *)EXC_TRC, (size_t)&dbsize); 332 bcopy(&dblow, (void *)EXC_BPT, (size_t)&dbsize); 333 #endif 334 __syncicache(EXC_RSVD, EXC_LAST - EXC_RSVD); 335 336 /* 337 * Make sure translation has been enabled 338 */ 339 mtmsr(mfmsr() | PSL_IR|PSL_DR|PSL_ME|PSL_RI); 340 isync(); 341 342 /* 343 * Initialise virtual memory. 344 */ 345 pmap_bootstrap(startkernel, endkernel); 346 347 /* 348 * Initialize params/tunables that are derived from memsize 349 */ 350 init_param2(physmem); 351 352 /* 353 * Finish setting up thread0. 354 */ 355 thread0.td_kstack = kstack0; 356 thread0.td_pcb = (struct pcb *) 357 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 358 359 /* 360 * Map and initialise the message buffer. 361 */ 362 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 363 pmap_kenter((vm_offset_t)msgbufp + off, msgbuf_phys + off); 364 msgbufinit(msgbufp, MSGBUF_SIZE); 365 366 #ifdef KDB 367 if (boothowto & RB_KDB) 368 kdb_enter("Boot flags requested debugger"); 369 #endif 370 } 371 372 void 373 bzero(void *buf, size_t len) 374 { 375 caddr_t p; 376 377 p = buf; 378 379 while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) { 380 *p++ = 0; 381 len--; 382 } 383 384 while (len >= sizeof(u_long) * 8) { 385 *(u_long*) p = 0; 386 *((u_long*) p + 1) = 0; 387 *((u_long*) p + 2) = 0; 388 *((u_long*) p + 3) = 0; 389 len -= sizeof(u_long) * 8; 390 *((u_long*) p + 4) = 0; 391 *((u_long*) p + 5) = 0; 392 *((u_long*) p + 6) = 0; 393 *((u_long*) p + 7) = 0; 394 p += sizeof(u_long) * 8; 395 } 396 397 while (len >= sizeof(u_long)) { 398 *(u_long*) p = 0; 399 len -= sizeof(u_long); 400 p += sizeof(u_long); 401 } 402 403 while (len) { 404 *p++ = 0; 405 len--; 406 } 407 } 408 409 void 410 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code) 411 { 412 struct trapframe *tf; 413 struct sigframe *sfp; 414 struct sigacts *psp; 415 struct sigframe sf; 416 struct thread *td; 417 struct proc *p; 418 int oonstack, rndfsize; 419 420 td = curthread; 421 p = td->td_proc; 422 PROC_LOCK_ASSERT(p, MA_OWNED); 423 psp = p->p_sigacts; 424 mtx_assert(&psp->ps_mtx, MA_OWNED); 425 tf = td->td_frame; 426 oonstack = sigonstack(tf->fixreg[1]); 427 428 rndfsize = ((sizeof(sf) + 15) / 16) * 16; 429 430 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 431 catcher, sig); 432 433 /* 434 * Save user context 435 */ 436 memset(&sf, 0, sizeof(sf)); 437 grab_mcontext(td, &sf.sf_uc.uc_mcontext, 0); 438 sf.sf_uc.uc_sigmask = *mask; 439 sf.sf_uc.uc_stack = td->td_sigstk; 440 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 441 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 442 443 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 444 445 /* 446 * Allocate and validate space for the signal handler context. 447 */ 448 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 449 SIGISMEMBER(psp->ps_sigonstack, sig)) { 450 sfp = (struct sigframe *)((caddr_t)td->td_sigstk.ss_sp + 451 td->td_sigstk.ss_size - rndfsize); 452 } else { 453 sfp = (struct sigframe *)(tf->fixreg[1] - rndfsize); 454 } 455 456 /* 457 * Translate the signal if appropriate (Linux emu ?) 458 */ 459 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 460 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 461 462 /* 463 * Save the floating-point state, if necessary, then copy it. 464 */ 465 /* XXX */ 466 467 /* 468 * Set up the registers to return to sigcode. 469 * 470 * r1/sp - sigframe ptr 471 * lr - sig function, dispatched to by blrl in trampoline 472 * r3 - sig number 473 * r4 - SIGINFO ? &siginfo : exception code 474 * r5 - user context 475 * srr0 - trampoline function addr 476 */ 477 tf->lr = (register_t)catcher; 478 tf->fixreg[1] = (register_t)sfp; 479 tf->fixreg[FIRSTARG] = sig; 480 tf->fixreg[FIRSTARG+2] = (register_t)&sfp->sf_uc; 481 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 482 /* 483 * Signal handler installed with SA_SIGINFO. 484 */ 485 tf->fixreg[FIRSTARG+1] = (register_t)&sfp->sf_si; 486 487 /* 488 * Fill siginfo structure. 489 */ 490 sf.sf_si.si_signo = sig; 491 sf.sf_si.si_code = code; 492 sf.sf_si.si_addr = (void *)tf->srr0; 493 } else { 494 /* Old FreeBSD-style arguments. */ 495 tf->fixreg[FIRSTARG+1] = code; 496 } 497 mtx_unlock(&psp->ps_mtx); 498 PROC_UNLOCK(p); 499 500 tf->srr0 = (register_t)(PS_STRINGS - *(p->p_sysent->sv_szsigcode)); 501 502 /* 503 * copy the frame out to userland. 504 */ 505 if (copyout((caddr_t)&sf, (caddr_t)sfp, sizeof(sf)) != 0) { 506 /* 507 * Process has trashed its stack. Kill it. 508 */ 509 CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp); 510 PROC_LOCK(p); 511 sigexit(td, SIGILL); 512 } 513 514 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, 515 tf->srr0, tf->fixreg[1]); 516 517 PROC_LOCK(p); 518 mtx_lock(&psp->ps_mtx); 519 } 520 521 /* 522 * Build siginfo_t for SA thread 523 */ 524 void 525 cpu_thread_siginfo(int sig, u_long code, siginfo_t *si) 526 { 527 struct proc *p; 528 struct thread *td; 529 530 td = curthread; 531 p = td->td_proc; 532 PROC_LOCK_ASSERT(p, MA_OWNED); 533 534 bzero(si, sizeof(*si)); 535 si->si_signo = sig; 536 si->si_code = code; 537 /* XXXKSE fill other fields */ 538 } 539 540 int 541 sigreturn(struct thread *td, struct sigreturn_args *uap) 542 { 543 struct proc *p; 544 ucontext_t uc; 545 int error; 546 547 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 548 549 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 550 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 551 return (EFAULT); 552 } 553 554 error = set_mcontext(td, &uc.uc_mcontext); 555 if (error != 0) 556 return (error); 557 558 p = td->td_proc; 559 PROC_LOCK(p); 560 td->td_sigmask = uc.uc_sigmask; 561 SIG_CANTMASK(td->td_sigmask); 562 signotify(td); 563 PROC_UNLOCK(p); 564 565 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 566 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 567 568 return (EJUSTRETURN); 569 } 570 571 #ifdef COMPAT_FREEBSD4 572 int 573 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 574 { 575 576 return sigreturn(td, (struct sigreturn_args *)uap); 577 } 578 #endif 579 580 /* 581 * Construct a PCB from a trapframe. This is called from kdb_trap() where 582 * we want to start a backtrace from the function that caused us to enter 583 * the debugger. We have the context in the trapframe, but base the trace 584 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 585 * enough for a backtrace. 586 */ 587 void 588 makectx(struct trapframe *tf, struct pcb *pcb) 589 { 590 591 pcb->pcb_lr = tf->srr0; 592 pcb->pcb_sp = tf->fixreg[1]; 593 } 594 595 /* 596 * get_mcontext/sendsig helper routine that doesn't touch the 597 * proc lock 598 */ 599 static int 600 grab_mcontext(struct thread *td, mcontext_t *mcp, int flags) 601 { 602 struct pcb *pcb; 603 604 pcb = td->td_pcb; 605 606 memset(mcp, 0, sizeof(mcontext_t)); 607 608 mcp->mc_vers = _MC_VERSION; 609 mcp->mc_flags = 0; 610 memcpy(&mcp->mc_frame, td->td_frame, sizeof(struct trapframe)); 611 if (flags & GET_MC_CLEAR_RET) { 612 mcp->mc_gpr[3] = 0; 613 mcp->mc_gpr[4] = 0; 614 } 615 616 /* 617 * This assumes that floating-point context is *not* lazy, 618 * so if the thread has used FP there would have been a 619 * FP-unavailable exception that would have set things up 620 * correctly. 621 */ 622 if (pcb->pcb_flags & PCB_FPU) { 623 KASSERT(td == curthread, 624 ("get_mcontext: fp save not curthread")); 625 critical_enter(); 626 save_fpu(td); 627 critical_exit(); 628 mcp->mc_flags |= _MC_FP_VALID; 629 memcpy(&mcp->mc_fpscr, &pcb->pcb_fpu.fpscr, sizeof(double)); 630 memcpy(mcp->mc_fpreg, pcb->pcb_fpu.fpr, 32*sizeof(double)); 631 } 632 633 /* XXX Altivec context ? */ 634 635 mcp->mc_len = sizeof(*mcp); 636 637 return (0); 638 } 639 640 int 641 get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 642 { 643 int error; 644 645 error = grab_mcontext(td, mcp, flags); 646 if (error == 0) { 647 PROC_LOCK(curthread->td_proc); 648 mcp->mc_onstack = sigonstack(td->td_frame->fixreg[1]); 649 PROC_UNLOCK(curthread->td_proc); 650 } 651 652 return (error); 653 } 654 655 int 656 set_mcontext(struct thread *td, const mcontext_t *mcp) 657 { 658 struct pcb *pcb; 659 struct trapframe *tf; 660 661 pcb = td->td_pcb; 662 tf = td->td_frame; 663 664 if (mcp->mc_vers != _MC_VERSION || 665 mcp->mc_len != sizeof(*mcp)) 666 return (EINVAL); 667 668 /* 669 * Don't let the user set privileged MSR bits 670 */ 671 if ((mcp->mc_srr1 & PSL_USERSTATIC) != (tf->srr1 & PSL_USERSTATIC)) { 672 return (EINVAL); 673 } 674 675 memcpy(tf, mcp->mc_frame, sizeof(mcp->mc_frame)); 676 677 if (mcp->mc_flags & _MC_FP_VALID) { 678 if ((pcb->pcb_flags & PCB_FPU) != PCB_FPU) { 679 critical_enter(); 680 enable_fpu(td); 681 critical_exit(); 682 } 683 memcpy(&pcb->pcb_fpu.fpscr, &mcp->mc_fpscr, sizeof(double)); 684 memcpy(pcb->pcb_fpu.fpr, mcp->mc_fpreg, 32*sizeof(double)); 685 } 686 687 /* XXX Altivec context? */ 688 689 return (0); 690 } 691 692 void 693 cpu_boot(int howto) 694 { 695 } 696 697 /* 698 * Shutdown the CPU as much as possible. 699 */ 700 void 701 cpu_halt(void) 702 { 703 704 OF_exit(); 705 } 706 707 void 708 cpu_idle(void) 709 { 710 /* Insert code to halt (until next interrupt) for the idle loop */ 711 } 712 713 /* 714 * Set set up registers on exec. 715 */ 716 void 717 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings) 718 { 719 struct trapframe *tf; 720 struct ps_strings arginfo; 721 722 tf = trapframe(td); 723 bzero(tf, sizeof *tf); 724 tf->fixreg[1] = -roundup(-stack + 8, 16); 725 726 /* 727 * XXX Machine-independent code has already copied arguments and 728 * XXX environment to userland. Get them back here. 729 */ 730 (void)copyin((char *)PS_STRINGS, &arginfo, sizeof(arginfo)); 731 732 /* 733 * Set up arguments for _start(): 734 * _start(argc, argv, envp, obj, cleanup, ps_strings); 735 * 736 * Notes: 737 * - obj and cleanup are the auxilliary and termination 738 * vectors. They are fixed up by ld.elf_so. 739 * - ps_strings is a NetBSD extention, and will be 740 * ignored by executables which are strictly 741 * compliant with the SVR4 ABI. 742 * 743 * XXX We have to set both regs and retval here due to different 744 * XXX calling convention in trap.c and init_main.c. 745 */ 746 /* 747 * XXX PG: these get overwritten in the syscall return code. 748 * execve() should return EJUSTRETURN, like it does on NetBSD. 749 * Emulate by setting the syscall return value cells. The 750 * registers still have to be set for init's fork trampoline. 751 */ 752 td->td_retval[0] = arginfo.ps_nargvstr; 753 td->td_retval[1] = (register_t)arginfo.ps_argvstr; 754 tf->fixreg[3] = arginfo.ps_nargvstr; 755 tf->fixreg[4] = (register_t)arginfo.ps_argvstr; 756 tf->fixreg[5] = (register_t)arginfo.ps_envstr; 757 tf->fixreg[6] = 0; /* auxillary vector */ 758 tf->fixreg[7] = 0; /* termination vector */ 759 tf->fixreg[8] = (register_t)PS_STRINGS; /* NetBSD extension */ 760 761 tf->srr0 = entry; 762 tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 763 td->td_pcb->pcb_flags = 0; 764 } 765 766 /* XXX: dummy {fill,set}_[fp]regs */ 767 int 768 fill_regs(struct thread *td, struct reg *regs) 769 { 770 771 return (ENOSYS); 772 } 773 774 int 775 fill_dbregs(struct thread *td, struct dbreg *dbregs) 776 { 777 778 return (ENOSYS); 779 } 780 781 int 782 fill_fpregs(struct thread *td, struct fpreg *fpregs) 783 { 784 785 return (ENOSYS); 786 } 787 788 int 789 set_regs(struct thread *td, struct reg *regs) 790 { 791 792 return (ENOSYS); 793 } 794 795 int 796 set_dbregs(struct thread *td, struct dbreg *dbregs) 797 { 798 799 return (ENOSYS); 800 } 801 802 int 803 set_fpregs(struct thread *td, struct fpreg *fpregs) 804 { 805 806 return (ENOSYS); 807 } 808 809 int 810 ptrace_set_pc(struct thread *td, unsigned long addr) 811 { 812 813 /* XXX: coming soon... */ 814 return (ENOSYS); 815 } 816 817 int 818 ptrace_single_step(struct thread *td) 819 { 820 821 /* XXX: coming soon... */ 822 return (ENOSYS); 823 } 824 825 int 826 ptrace_clear_single_step(struct thread *td) 827 { 828 829 /* XXX: coming soon... */ 830 return (ENOSYS); 831 } 832 833 /* 834 * Initialise a struct pcpu. 835 */ 836 void 837 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz) 838 { 839 840 } 841 842 /* 843 * kcopy(const void *src, void *dst, size_t len); 844 * 845 * Copy len bytes from src to dst, aborting if we encounter a fatal 846 * page fault. 847 * 848 * kcopy() _must_ save and restore the old fault handler since it is 849 * called by uiomove(), which may be in the path of servicing a non-fatal 850 * page fault. 851 */ 852 int 853 kcopy(const void *src, void *dst, size_t len) 854 { 855 struct thread *td; 856 faultbuf env, *oldfault; 857 int rv; 858 859 td = PCPU_GET(curthread); 860 oldfault = td->td_pcb->pcb_onfault; 861 if ((rv = setfault(env)) != 0) { 862 td->td_pcb->pcb_onfault = oldfault; 863 return rv; 864 } 865 866 memcpy(dst, src, len); 867 868 td->td_pcb->pcb_onfault = oldfault; 869 return (0); 870 } 871 872 void 873 asm_panic(char *pstr) 874 { 875 panic(pstr); 876 } 877 878 int db_trap_glue(struct trapframe *); /* Called from trap_subr.S */ 879 880 int 881 db_trap_glue(struct trapframe *frame) 882 { 883 if (!(frame->srr1 & PSL_PR) 884 && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC 885 || (frame->exc == EXC_PGM 886 && (frame->srr1 & 0x20000)) 887 || frame->exc == EXC_BPT)) { 888 int type = frame->exc; 889 if (type == EXC_PGM && (frame->srr1 & 0x20000)) { 890 type = T_BREAKPOINT; 891 } 892 return (kdb_trap(type, 0, frame)); 893 } 894 895 return (0); 896 } 897