Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/powerpc/powerpc/machdep.c
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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: releng/7.3/sys/powerpc/powerpc/machdep.c 189498 2009-03-07 20:39:42Z nwhitehorn $"); 59 60 #include "opt_compat.h" 61 #include "opt_ddb.h" 62 #include "opt_kstack_pages.h" 63 #include "opt_msgbuf.h" 64 65 #include <sys/param.h> 66 #include <sys/proc.h> 67 #include <sys/systm.h> 68 #include <sys/bio.h> 69 #include <sys/buf.h> 70 #include <sys/bus.h> 71 #include <sys/cons.h> 72 #include <sys/cpu.h> 73 #include <sys/eventhandler.h> 74 #include <sys/exec.h> 75 #include <sys/imgact.h> 76 #include <sys/kdb.h> 77 #include <sys/kernel.h> 78 #include <sys/ktr.h> 79 #include <sys/linker.h> 80 #include <sys/lock.h> 81 #include <sys/malloc.h> 82 #include <sys/mbuf.h> 83 #include <sys/msgbuf.h> 84 #include <sys/mutex.h> 85 #include <sys/ptrace.h> 86 #include <sys/reboot.h> 87 #include <sys/signalvar.h> 88 #include <sys/sysctl.h> 89 #include <sys/sysent.h> 90 #include <sys/sysproto.h> 91 #include <sys/ucontext.h> 92 #include <sys/uio.h> 93 #include <sys/vmmeter.h> 94 #include <sys/vnode.h> 95 96 #include <net/netisr.h> 97 98 #include <vm/vm.h> 99 #include <vm/vm_extern.h> 100 #include <vm/vm_kern.h> 101 #include <vm/vm_page.h> 102 #include <vm/vm_map.h> 103 #include <vm/vm_object.h> 104 #include <vm/vm_pager.h> 105 106 #include <machine/altivec.h> 107 #include <machine/bat.h> 108 #include <machine/cpu.h> 109 #include <machine/elf.h> 110 #include <machine/fpu.h> 111 #include <machine/md_var.h> 112 #include <machine/metadata.h> 113 #include <machine/mmuvar.h> 114 #include <machine/pcb.h> 115 #include <machine/powerpc.h> 116 #include <machine/reg.h> 117 #include <machine/sigframe.h> 118 #include <machine/trap.h> 119 #include <machine/vmparam.h> 120 121 #include <ddb/ddb.h> 122 123 #include <dev/ofw/openfirm.h> 124 125 #ifdef DDB 126 extern vm_offset_t ksym_start, ksym_end; 127 #endif 128 129 int cold = 1; 130 131 struct pcpu __pcpu[MAXCPU]; 132 struct trapframe frame0; 133 134 vm_offset_t kstack0; 135 vm_offset_t kstack0_phys; 136 137 char machine[] = "powerpc"; 138 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 139 140 static int cacheline_size = CACHELINESIZE; 141 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 142 CTLFLAG_RD, &cacheline_size, 0, ""); 143 144 static void cpu_startup(void *); 145 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 146 147 void powerpc_init(u_int, u_int, u_int, void *); 148 149 int save_ofw_mapping(void); 150 int restore_ofw_mapping(void); 151 152 void install_extint(void (*)(void)); 153 154 int setfault(faultbuf); /* defined in locore.S */ 155 156 static int grab_mcontext(struct thread *, mcontext_t *, int); 157 158 void asm_panic(char *); 159 160 long Maxmem = 0; 161 long realmem = 0; 162 163 struct pmap ofw_pmap; 164 extern int ofmsr; 165 166 struct bat battable[16]; 167 168 struct kva_md_info kmi; 169 170 void setPQL2(int *const size, int *const ways); 171 172 void 173 setPQL2(int *const size, int *const ways) 174 { 175 return; 176 } 177 178 static void 179 powerpc_ofw_shutdown(void *junk, int howto) 180 { 181 if (howto & RB_HALT) { 182 OF_halt(); 183 } 184 OF_reboot(); 185 } 186 187 static void 188 cpu_startup(void *dummy) 189 { 190 191 /* 192 * Initialise the decrementer-based clock. 193 */ 194 decr_init(); 195 196 /* 197 * Good {morning,afternoon,evening,night}. 198 */ 199 cpu_setup(PCPU_GET(cpuid)); 200 201 /* startrtclock(); */ 202 #ifdef PERFMON 203 perfmon_init(); 204 #endif 205 printf("real memory = %ld (%ld MB)\n", ptoa(physmem), 206 ptoa(physmem) / 1048576); 207 realmem = physmem; 208 209 /* 210 * Display any holes after the first chunk of extended memory. 211 */ 212 if (bootverbose) { 213 int indx; 214 215 printf("Physical memory chunk(s):\n"); 216 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 217 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 218 219 printf("0x%08x - 0x%08x, %d bytes (%d pages)\n", 220 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 221 size1 / PAGE_SIZE); 222 } 223 } 224 225 vm_ksubmap_init(&kmi); 226 227 printf("avail memory = %ld (%ld MB)\n", ptoa(cnt.v_free_count), 228 ptoa(cnt.v_free_count) / 1048576); 229 230 /* 231 * Set up buffers, so they can be used to read disk labels. 232 */ 233 bufinit(); 234 vm_pager_bufferinit(); 235 236 EVENTHANDLER_REGISTER(shutdown_final, powerpc_ofw_shutdown, 0, 237 SHUTDOWN_PRI_LAST); 238 239 #ifdef SMP 240 /* 241 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 242 */ 243 mp_start(); /* fire up the secondaries */ 244 mp_announce(); 245 #endif /* SMP */ 246 } 247 248 extern char kernel_text[], _end[]; 249 250 extern void *trapcode, *trapsize; 251 extern void *alitrap, *alisize; 252 extern void *dsitrap, *dsisize; 253 extern void *decrint, *decrsize; 254 extern void *extint, *extsize; 255 extern void *dblow, *dbsize; 256 257 void 258 powerpc_init(u_int startkernel, u_int endkernel, u_int basekernel, void *mdp) 259 { 260 struct pcpu *pc; 261 vm_offset_t end, off; 262 void *kmdp; 263 char *env; 264 265 end = 0; 266 kmdp = NULL; 267 268 /* 269 * Parse metadata if present and fetch parameters. Must be done 270 * before console is inited so cninit gets the right value of 271 * boothowto. 272 */ 273 if (mdp != NULL) { 274 preload_metadata = mdp; 275 kmdp = preload_search_by_type("elf kernel"); 276 if (kmdp != NULL) { 277 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 278 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); 279 end = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t); 280 #ifdef DDB 281 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 282 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 283 #endif 284 } 285 } 286 287 /* 288 * Init params/tunables that can be overridden by the loader 289 */ 290 init_param1(); 291 292 /* 293 * Start initializing proc0 and thread0. 294 */ 295 proc_linkup0(&proc0, &thread0); 296 thread0.td_frame = &frame0; 297 298 /* 299 * Set up per-cpu data. 300 */ 301 pc = &__pcpu[0]; 302 pcpu_init(pc, 0, sizeof(struct pcpu)); 303 pc->pc_curthread = &thread0; 304 pc->pc_curpcb = thread0.td_pcb; 305 pc->pc_cpuid = 0; 306 307 __asm __volatile("mtsprg 0, %0" :: "r"(pc)); 308 309 mutex_init(); 310 311 /* 312 * Initialize the console before printing anything. 313 */ 314 cninit(); 315 316 /* 317 * Complain if there is no metadata. 318 */ 319 if (mdp == NULL || kmdp == NULL) { 320 printf("powerpc_init: no loader metadata.\n"); 321 } 322 323 kdb_init(); 324 325 kobj_machdep_init(); 326 327 /* 328 * XXX: Initialize the interrupt tables. 329 * Disable translation in case the vector area 330 * hasn't been mapped (G5) 331 */ 332 mtmsr(mfmsr() & ~(PSL_IR | PSL_DR)); 333 isync(); 334 bcopy(&trapcode, (void *)EXC_RST, (size_t)&trapsize); 335 bcopy(&trapcode, (void *)EXC_MCHK, (size_t)&trapsize); 336 bcopy(&dsitrap, (void *)EXC_DSI, (size_t)&dsisize); 337 bcopy(&trapcode, (void *)EXC_ISI, (size_t)&trapsize); 338 bcopy(&trapcode, (void *)EXC_EXI, (size_t)&trapsize); 339 bcopy(&alitrap, (void *)EXC_ALI, (size_t)&alisize); 340 bcopy(&trapcode, (void *)EXC_PGM, (size_t)&trapsize); 341 bcopy(&trapcode, (void *)EXC_FPU, (size_t)&trapsize); 342 bcopy(&trapcode, (void *)EXC_DECR, (size_t)&trapsize); 343 bcopy(&trapcode, (void *)EXC_SC, (size_t)&trapsize); 344 bcopy(&trapcode, (void *)EXC_TRC, (size_t)&trapsize); 345 bcopy(&trapcode, (void *)EXC_FPA, (size_t)&trapsize); 346 bcopy(&trapcode, (void *)EXC_VEC, (size_t)&trapsize); 347 bcopy(&trapcode, (void *)EXC_VECAST, (size_t)&trapsize); 348 bcopy(&trapcode, (void *)EXC_THRM, (size_t)&trapsize); 349 bcopy(&trapcode, (void *)EXC_BPT, (size_t)&trapsize); 350 #ifdef KDB 351 bcopy(&dblow, (void *)EXC_RST, (size_t)&dbsize); 352 bcopy(&dblow, (void *)EXC_MCHK, (size_t)&dbsize); 353 bcopy(&dblow, (void *)EXC_PGM, (size_t)&dbsize); 354 bcopy(&dblow, (void *)EXC_TRC, (size_t)&dbsize); 355 bcopy(&dblow, (void *)EXC_BPT, (size_t)&dbsize); 356 #endif 357 __syncicache(EXC_RSVD, EXC_LAST - EXC_RSVD); 358 359 /* 360 * Make sure translation has been enabled 361 */ 362 mtmsr(mfmsr() | PSL_IR|PSL_DR|PSL_ME|PSL_RI); 363 isync(); 364 365 /* 366 * Initialise virtual memory. 367 */ 368 pmap_mmu_install(MMU_TYPE_OEA, 0); /* XXX temporary */ 369 pmap_bootstrap(startkernel, endkernel); 370 371 /* 372 * Initialize params/tunables that are derived from memsize 373 */ 374 init_param2(physmem); 375 376 /* 377 * Grab booted kernel's name 378 */ 379 env = getenv("kernelname"); 380 if (env != NULL) { 381 strlcpy(kernelname, env, sizeof(kernelname)); 382 freeenv(env); 383 } 384 385 /* 386 * Finish setting up thread0. 387 */ 388 thread0.td_kstack = kstack0; 389 thread0.td_pcb = (struct pcb *) 390 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 391 392 /* 393 * Map and initialise the message buffer. 394 */ 395 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 396 pmap_kenter((vm_offset_t)msgbufp + off, msgbuf_phys + off); 397 msgbufinit(msgbufp, MSGBUF_SIZE); 398 399 #ifdef KDB 400 if (boothowto & RB_KDB) 401 kdb_enter_why(KDB_WHY_BOOTFLAGS, 402 "Boot flags requested debugger"); 403 #endif 404 } 405 406 void 407 bzero(void *buf, size_t len) 408 { 409 caddr_t p; 410 411 p = buf; 412 413 while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) { 414 *p++ = 0; 415 len--; 416 } 417 418 while (len >= sizeof(u_long) * 8) { 419 *(u_long*) p = 0; 420 *((u_long*) p + 1) = 0; 421 *((u_long*) p + 2) = 0; 422 *((u_long*) p + 3) = 0; 423 len -= sizeof(u_long) * 8; 424 *((u_long*) p + 4) = 0; 425 *((u_long*) p + 5) = 0; 426 *((u_long*) p + 6) = 0; 427 *((u_long*) p + 7) = 0; 428 p += sizeof(u_long) * 8; 429 } 430 431 while (len >= sizeof(u_long)) { 432 *(u_long*) p = 0; 433 len -= sizeof(u_long); 434 p += sizeof(u_long); 435 } 436 437 while (len) { 438 *p++ = 0; 439 len--; 440 } 441 } 442 443 void 444 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 445 { 446 struct trapframe *tf; 447 struct sigframe *sfp; 448 struct sigacts *psp; 449 struct sigframe sf; 450 struct thread *td; 451 struct proc *p; 452 int oonstack, rndfsize; 453 int sig; 454 int code; 455 456 td = curthread; 457 p = td->td_proc; 458 PROC_LOCK_ASSERT(p, MA_OWNED); 459 sig = ksi->ksi_signo; 460 code = ksi->ksi_code; 461 psp = p->p_sigacts; 462 mtx_assert(&psp->ps_mtx, MA_OWNED); 463 tf = td->td_frame; 464 oonstack = sigonstack(tf->fixreg[1]); 465 466 rndfsize = ((sizeof(sf) + 15) / 16) * 16; 467 468 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 469 catcher, sig); 470 471 /* 472 * Save user context 473 */ 474 memset(&sf, 0, sizeof(sf)); 475 grab_mcontext(td, &sf.sf_uc.uc_mcontext, 0); 476 sf.sf_uc.uc_sigmask = *mask; 477 sf.sf_uc.uc_stack = td->td_sigstk; 478 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 479 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 480 481 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 482 483 /* 484 * Allocate and validate space for the signal handler context. 485 */ 486 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 487 SIGISMEMBER(psp->ps_sigonstack, sig)) { 488 sfp = (struct sigframe *)(td->td_sigstk.ss_sp + 489 td->td_sigstk.ss_size - rndfsize); 490 } else { 491 sfp = (struct sigframe *)(tf->fixreg[1] - rndfsize); 492 } 493 494 /* 495 * Translate the signal if appropriate (Linux emu ?) 496 */ 497 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 498 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 499 500 /* 501 * Save the floating-point state, if necessary, then copy it. 502 */ 503 /* XXX */ 504 505 /* 506 * Set up the registers to return to sigcode. 507 * 508 * r1/sp - sigframe ptr 509 * lr - sig function, dispatched to by blrl in trampoline 510 * r3 - sig number 511 * r4 - SIGINFO ? &siginfo : exception code 512 * r5 - user context 513 * srr0 - trampoline function addr 514 */ 515 tf->lr = (register_t)catcher; 516 tf->fixreg[1] = (register_t)sfp; 517 tf->fixreg[FIRSTARG] = sig; 518 tf->fixreg[FIRSTARG+2] = (register_t)&sfp->sf_uc; 519 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 520 /* 521 * Signal handler installed with SA_SIGINFO. 522 */ 523 tf->fixreg[FIRSTARG+1] = (register_t)&sfp->sf_si; 524 525 /* 526 * Fill siginfo structure. 527 */ 528 sf.sf_si = ksi->ksi_info; 529 sf.sf_si.si_signo = sig; 530 sf.sf_si.si_addr = (void *) ((tf->exc == EXC_DSI) ? 531 tf->dar : tf->srr0); 532 } else { 533 /* Old FreeBSD-style arguments. */ 534 tf->fixreg[FIRSTARG+1] = code; 535 tf->fixreg[FIRSTARG+3] = (tf->exc == EXC_DSI) ? 536 tf->dar : tf->srr0; 537 } 538 mtx_unlock(&psp->ps_mtx); 539 PROC_UNLOCK(p); 540 541 tf->srr0 = (register_t)(PS_STRINGS - *(p->p_sysent->sv_szsigcode)); 542 543 /* 544 * copy the frame out to userland. 545 */ 546 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 547 /* 548 * Process has trashed its stack. Kill it. 549 */ 550 CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp); 551 PROC_LOCK(p); 552 sigexit(td, SIGILL); 553 } 554 555 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, 556 tf->srr0, tf->fixreg[1]); 557 558 PROC_LOCK(p); 559 mtx_lock(&psp->ps_mtx); 560 } 561 562 int 563 sigreturn(struct thread *td, struct sigreturn_args *uap) 564 { 565 struct proc *p; 566 ucontext_t uc; 567 int error; 568 569 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 570 571 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 572 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 573 return (EFAULT); 574 } 575 576 error = set_mcontext(td, &uc.uc_mcontext); 577 if (error != 0) 578 return (error); 579 580 p = td->td_proc; 581 PROC_LOCK(p); 582 td->td_sigmask = uc.uc_sigmask; 583 SIG_CANTMASK(td->td_sigmask); 584 signotify(td); 585 PROC_UNLOCK(p); 586 587 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 588 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 589 590 return (EJUSTRETURN); 591 } 592 593 #ifdef COMPAT_FREEBSD4 594 int 595 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 596 { 597 598 return sigreturn(td, (struct sigreturn_args *)uap); 599 } 600 #endif 601 602 /* 603 * Construct a PCB from a trapframe. This is called from kdb_trap() where 604 * we want to start a backtrace from the function that caused us to enter 605 * the debugger. We have the context in the trapframe, but base the trace 606 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 607 * enough for a backtrace. 608 */ 609 void 610 makectx(struct trapframe *tf, struct pcb *pcb) 611 { 612 613 pcb->pcb_lr = tf->srr0; 614 pcb->pcb_sp = tf->fixreg[1]; 615 } 616 617 /* 618 * get_mcontext/sendsig helper routine that doesn't touch the 619 * proc lock 620 */ 621 static int 622 grab_mcontext(struct thread *td, mcontext_t *mcp, int flags) 623 { 624 struct pcb *pcb; 625 626 pcb = td->td_pcb; 627 628 memset(mcp, 0, sizeof(mcontext_t)); 629 630 mcp->mc_vers = _MC_VERSION; 631 mcp->mc_flags = 0; 632 memcpy(&mcp->mc_frame, td->td_frame, sizeof(struct trapframe)); 633 if (flags & GET_MC_CLEAR_RET) { 634 mcp->mc_gpr[3] = 0; 635 mcp->mc_gpr[4] = 0; 636 } 637 638 /* 639 * This assumes that floating-point context is *not* lazy, 640 * so if the thread has used FP there would have been a 641 * FP-unavailable exception that would have set things up 642 * correctly. 643 */ 644 if (pcb->pcb_flags & PCB_FPU) { 645 KASSERT(td == curthread, 646 ("get_mcontext: fp save not curthread")); 647 critical_enter(); 648 save_fpu(td); 649 critical_exit(); 650 mcp->mc_flags |= _MC_FP_VALID; 651 memcpy(&mcp->mc_fpscr, &pcb->pcb_fpu.fpscr, sizeof(double)); 652 memcpy(mcp->mc_fpreg, pcb->pcb_fpu.fpr, 32*sizeof(double)); 653 } 654 655 /* 656 * Repeat for Altivec context 657 */ 658 659 if (pcb->pcb_flags & PCB_VEC) { 660 KASSERT(td == curthread, 661 ("get_mcontext: fp save not curthread")); 662 critical_enter(); 663 save_vec(td); 664 critical_exit(); 665 mcp->mc_flags |= _MC_AV_VALID; 666 mcp->mc_vscr = pcb->pcb_vec.vscr; 667 mcp->mc_vrsave = pcb->pcb_vec.vrsave; 668 memcpy(mcp->mc_avec, pcb->pcb_vec.vr, sizeof(mcp->mc_avec)); 669 } 670 671 mcp->mc_len = sizeof(*mcp); 672 673 return (0); 674 } 675 676 int 677 get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 678 { 679 int error; 680 681 error = grab_mcontext(td, mcp, flags); 682 if (error == 0) { 683 PROC_LOCK(curthread->td_proc); 684 mcp->mc_onstack = sigonstack(td->td_frame->fixreg[1]); 685 PROC_UNLOCK(curthread->td_proc); 686 } 687 688 return (error); 689 } 690 691 int 692 set_mcontext(struct thread *td, const mcontext_t *mcp) 693 { 694 struct pcb *pcb; 695 struct trapframe *tf; 696 697 pcb = td->td_pcb; 698 tf = td->td_frame; 699 700 if (mcp->mc_vers != _MC_VERSION || 701 mcp->mc_len != sizeof(*mcp)) 702 return (EINVAL); 703 704 /* 705 * Don't let the user set privileged MSR bits 706 */ 707 if ((mcp->mc_srr1 & PSL_USERSTATIC) != (tf->srr1 & PSL_USERSTATIC)) { 708 return (EINVAL); 709 } 710 711 memcpy(tf, mcp->mc_frame, sizeof(mcp->mc_frame)); 712 713 if (mcp->mc_flags & _MC_FP_VALID) { 714 if ((pcb->pcb_flags & PCB_FPU) != PCB_FPU) { 715 critical_enter(); 716 enable_fpu(td); 717 critical_exit(); 718 } 719 memcpy(&pcb->pcb_fpu.fpscr, &mcp->mc_fpscr, sizeof(double)); 720 memcpy(pcb->pcb_fpu.fpr, mcp->mc_fpreg, 32*sizeof(double)); 721 } 722 723 if (mcp->mc_flags & _MC_AV_VALID) { 724 if ((pcb->pcb_flags & PCB_VEC) != PCB_VEC) { 725 critical_enter(); 726 enable_vec(td); 727 critical_exit(); 728 } 729 pcb->pcb_vec.vscr = mcp->mc_vscr; 730 pcb->pcb_vec.vrsave = mcp->mc_vrsave; 731 memcpy(pcb->pcb_vec.vr, mcp->mc_avec, sizeof(mcp->mc_avec)); 732 } 733 734 735 return (0); 736 } 737 738 void 739 cpu_boot(int howto) 740 { 741 } 742 743 void 744 cpu_initclocks(void) 745 { 746 747 decr_tc_init(); 748 } 749 750 /* Get current clock frequency for the given cpu id. */ 751 int 752 cpu_est_clockrate(int cpu_id, uint64_t *rate) 753 { 754 755 return (ENXIO); 756 } 757 758 /* 759 * Shutdown the CPU as much as possible. 760 */ 761 void 762 cpu_halt(void) 763 { 764 765 OF_exit(); 766 } 767 768 void 769 cpu_idle(void) 770 { 771 /* TODO: Insert code to halt (until next interrupt) */ 772 773 #ifdef INVARIANTS 774 if ((mfmsr() & PSL_EE) != PSL_EE) { 775 struct thread *td = curthread; 776 printf("td msr %x\n", td->td_md.md_saved_msr); 777 panic("ints disabled in idleproc!"); 778 } 779 #endif 780 } 781 782 /* 783 * Set set up registers on exec. 784 */ 785 void 786 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings) 787 { 788 struct trapframe *tf; 789 struct ps_strings arginfo; 790 791 tf = trapframe(td); 792 bzero(tf, sizeof *tf); 793 tf->fixreg[1] = -roundup(-stack + 8, 16); 794 795 /* 796 * XXX Machine-independent code has already copied arguments and 797 * XXX environment to userland. Get them back here. 798 */ 799 (void)copyin((char *)PS_STRINGS, &arginfo, sizeof(arginfo)); 800 801 /* 802 * Set up arguments for _start(): 803 * _start(argc, argv, envp, obj, cleanup, ps_strings); 804 * 805 * Notes: 806 * - obj and cleanup are the auxilliary and termination 807 * vectors. They are fixed up by ld.elf_so. 808 * - ps_strings is a NetBSD extention, and will be 809 * ignored by executables which are strictly 810 * compliant with the SVR4 ABI. 811 * 812 * XXX We have to set both regs and retval here due to different 813 * XXX calling convention in trap.c and init_main.c. 814 */ 815 /* 816 * XXX PG: these get overwritten in the syscall return code. 817 * execve() should return EJUSTRETURN, like it does on NetBSD. 818 * Emulate by setting the syscall return value cells. The 819 * registers still have to be set for init's fork trampoline. 820 */ 821 td->td_retval[0] = arginfo.ps_nargvstr; 822 td->td_retval[1] = (register_t)arginfo.ps_argvstr; 823 tf->fixreg[3] = arginfo.ps_nargvstr; 824 tf->fixreg[4] = (register_t)arginfo.ps_argvstr; 825 tf->fixreg[5] = (register_t)arginfo.ps_envstr; 826 tf->fixreg[6] = 0; /* auxillary vector */ 827 tf->fixreg[7] = 0; /* termination vector */ 828 tf->fixreg[8] = (register_t)PS_STRINGS; /* NetBSD extension */ 829 830 tf->srr0 = entry; 831 tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 832 td->td_pcb->pcb_flags = 0; 833 } 834 835 int 836 fill_regs(struct thread *td, struct reg *regs) 837 { 838 struct trapframe *tf; 839 840 tf = td->td_frame; 841 memcpy(regs, tf, sizeof(struct reg)); 842 843 return (0); 844 } 845 846 int 847 fill_dbregs(struct thread *td, struct dbreg *dbregs) 848 { 849 /* No debug registers on PowerPC */ 850 return (ENOSYS); 851 } 852 853 int 854 fill_fpregs(struct thread *td, struct fpreg *fpregs) 855 { 856 struct pcb *pcb; 857 858 pcb = td->td_pcb; 859 860 if ((pcb->pcb_flags & PCB_FPU) == 0) 861 memset(fpregs, 0, sizeof(struct fpreg)); 862 else 863 memcpy(fpregs, &pcb->pcb_fpu, sizeof(struct fpreg)); 864 865 return (0); 866 } 867 868 int 869 set_regs(struct thread *td, struct reg *regs) 870 { 871 struct trapframe *tf; 872 873 tf = td->td_frame; 874 memcpy(tf, regs, sizeof(struct reg)); 875 876 return (0); 877 } 878 879 int 880 set_dbregs(struct thread *td, struct dbreg *dbregs) 881 { 882 /* No debug registers on PowerPC */ 883 return (ENOSYS); 884 } 885 886 int 887 set_fpregs(struct thread *td, struct fpreg *fpregs) 888 { 889 struct pcb *pcb; 890 891 pcb = td->td_pcb; 892 if ((pcb->pcb_flags & PCB_FPU) == 0) 893 enable_fpu(td); 894 memcpy(&pcb->pcb_fpu, fpregs, sizeof(struct fpreg)); 895 896 return (0); 897 } 898 899 int 900 ptrace_set_pc(struct thread *td, unsigned long addr) 901 { 902 struct trapframe *tf; 903 904 tf = td->td_frame; 905 tf->srr0 = (register_t)addr; 906 907 return (0); 908 } 909 910 int 911 ptrace_single_step(struct thread *td) 912 { 913 struct trapframe *tf; 914 915 tf = td->td_frame; 916 tf->srr1 |= PSL_SE; 917 918 return (0); 919 } 920 921 int 922 ptrace_clear_single_step(struct thread *td) 923 { 924 struct trapframe *tf; 925 926 tf = td->td_frame; 927 tf->srr1 &= ~PSL_SE; 928 929 return (0); 930 } 931 932 /* 933 * Initialise a struct pcpu. 934 */ 935 void 936 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz) 937 { 938 939 } 940 941 void 942 spinlock_enter(void) 943 { 944 struct thread *td; 945 946 td = curthread; 947 if (td->td_md.md_spinlock_count == 0) 948 td->td_md.md_saved_msr = intr_disable(); 949 td->td_md.md_spinlock_count++; 950 critical_enter(); 951 } 952 953 void 954 spinlock_exit(void) 955 { 956 struct thread *td; 957 958 td = curthread; 959 critical_exit(); 960 td->td_md.md_spinlock_count--; 961 if (td->td_md.md_spinlock_count == 0) 962 intr_restore(td->td_md.md_saved_msr); 963 } 964 965 /* 966 * kcopy(const void *src, void *dst, size_t len); 967 * 968 * Copy len bytes from src to dst, aborting if we encounter a fatal 969 * page fault. 970 * 971 * kcopy() _must_ save and restore the old fault handler since it is 972 * called by uiomove(), which may be in the path of servicing a non-fatal 973 * page fault. 974 */ 975 int 976 kcopy(const void *src, void *dst, size_t len) 977 { 978 struct thread *td; 979 faultbuf env, *oldfault; 980 int rv; 981 982 td = PCPU_GET(curthread); 983 oldfault = td->td_pcb->pcb_onfault; 984 if ((rv = setfault(env)) != 0) { 985 td->td_pcb->pcb_onfault = oldfault; 986 return rv; 987 } 988 989 memcpy(dst, src, len); 990 991 td->td_pcb->pcb_onfault = oldfault; 992 return (0); 993 } 994 995 void 996 asm_panic(char *pstr) 997 { 998 panic(pstr); 999 } 1000 1001 int db_trap_glue(struct trapframe *); /* Called from trap_subr.S */ 1002 1003 int 1004 db_trap_glue(struct trapframe *frame) 1005 { 1006 if (!(frame->srr1 & PSL_PR) 1007 && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC 1008 || (frame->exc == EXC_PGM 1009 && (frame->srr1 & 0x20000)) 1010 || frame->exc == EXC_BPT 1011 || frame->exc == EXC_DSI)) { 1012 int type = frame->exc; 1013 if (type == EXC_PGM && (frame->srr1 & 0x20000)) { 1014 type = T_BREAKPOINT; 1015 } 1016 return (kdb_trap(type, 0, frame)); 1017 } 1018 1019 return (0); 1020 }
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