Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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("$FreeBSD$"); 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/bat.h> 107 #include <machine/cpu.h> 108 #include <machine/elf.h> 109 #include <machine/fpu.h> 110 #include <machine/md_var.h> 111 #include <machine/metadata.h> 112 #include <machine/mmuvar.h> 113 #include <machine/pcb.h> 114 #include <machine/powerpc.h> 115 #include <machine/reg.h> 116 #include <machine/sigframe.h> 117 #include <machine/trap.h> 118 #include <machine/vmparam.h> 119 120 #include <ddb/ddb.h> 121 122 #include <dev/ofw/openfirm.h> 123 124 #ifdef DDB 125 extern vm_offset_t ksym_start, ksym_end; 126 #endif 127 128 int cold = 1; 129 130 struct pcpu __pcpu[MAXCPU]; 131 struct trapframe frame0; 132 133 vm_offset_t kstack0; 134 vm_offset_t kstack0_phys; 135 136 char machine[] = "powerpc"; 137 SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 138 139 static int cacheline_size = CACHELINESIZE; 140 SYSCTL_INT(_machdep, CPU_CACHELINE, cacheline_size, 141 CTLFLAG_RD, &cacheline_size, 0, ""); 142 143 static void cpu_startup(void *); 144 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 145 146 void powerpc_init(u_int, u_int, u_int, void *); 147 148 int save_ofw_mapping(void); 149 int restore_ofw_mapping(void); 150 151 void install_extint(void (*)(void)); 152 153 int setfault(faultbuf); /* defined in locore.S */ 154 155 static int grab_mcontext(struct thread *, mcontext_t *, int); 156 157 void asm_panic(char *); 158 159 long Maxmem = 0; 160 long realmem = 0; 161 162 struct pmap ofw_pmap; 163 extern int ofmsr; 164 165 struct bat battable[16]; 166 167 struct kva_md_info kmi; 168 169 void setPQL2(int *const size, int *const ways); 170 171 void 172 setPQL2(int *const size, int *const ways) 173 { 174 return; 175 } 176 177 static void 178 powerpc_ofw_shutdown(void *junk, int howto) 179 { 180 if (howto & RB_HALT) { 181 OF_halt(); 182 } 183 OF_reboot(); 184 } 185 186 static void 187 cpu_startup(void *dummy) 188 { 189 190 /* 191 * Initialise the decrementer-based clock. 192 */ 193 decr_init(); 194 195 /* 196 * Good {morning,afternoon,evening,night}. 197 */ 198 cpu_setup(PCPU_GET(cpuid)); 199 200 /* startrtclock(); */ 201 #ifdef PERFMON 202 perfmon_init(); 203 #endif 204 printf("real memory = %ld (%ld MB)\n", ptoa(physmem), 205 ptoa(physmem) / 1048576); 206 realmem = physmem; 207 208 /* 209 * Display any holes after the first chunk of extended memory. 210 */ 211 if (bootverbose) { 212 int indx; 213 214 printf("Physical memory chunk(s):\n"); 215 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 216 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 217 218 printf("0x%08x - 0x%08x, %d bytes (%d pages)\n", 219 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 220 size1 / PAGE_SIZE); 221 } 222 } 223 224 vm_ksubmap_init(&kmi); 225 226 printf("avail memory = %ld (%ld MB)\n", ptoa(cnt.v_free_count), 227 ptoa(cnt.v_free_count) / 1048576); 228 229 /* 230 * Set up buffers, so they can be used to read disk labels. 231 */ 232 bufinit(); 233 vm_pager_bufferinit(); 234 235 EVENTHANDLER_REGISTER(shutdown_final, powerpc_ofw_shutdown, 0, 236 SHUTDOWN_PRI_LAST); 237 238 #ifdef SMP 239 /* 240 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 241 */ 242 mp_start(); /* fire up the secondaries */ 243 mp_announce(); 244 #endif /* SMP */ 245 } 246 247 extern char kernel_text[], _end[]; 248 249 extern void *trapcode, *trapsize; 250 extern void *alitrap, *alisize; 251 extern void *dsitrap, *dsisize; 252 extern void *decrint, *decrsize; 253 extern void *extint, *extsize; 254 extern void *dblow, *dbsize; 255 extern void *vectrap, *vectrapsize; 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(&vectrap, (void *)EXC_VEC, (size_t)&vectrapsize); 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("Boot flags requested debugger"); 402 #endif 403 } 404 405 void 406 bzero(void *buf, size_t len) 407 { 408 caddr_t p; 409 410 p = buf; 411 412 while (((vm_offset_t) p & (sizeof(u_long) - 1)) && len) { 413 *p++ = 0; 414 len--; 415 } 416 417 while (len >= sizeof(u_long) * 8) { 418 *(u_long*) p = 0; 419 *((u_long*) p + 1) = 0; 420 *((u_long*) p + 2) = 0; 421 *((u_long*) p + 3) = 0; 422 len -= sizeof(u_long) * 8; 423 *((u_long*) p + 4) = 0; 424 *((u_long*) p + 5) = 0; 425 *((u_long*) p + 6) = 0; 426 *((u_long*) p + 7) = 0; 427 p += sizeof(u_long) * 8; 428 } 429 430 while (len >= sizeof(u_long)) { 431 *(u_long*) p = 0; 432 len -= sizeof(u_long); 433 p += sizeof(u_long); 434 } 435 436 while (len) { 437 *p++ = 0; 438 len--; 439 } 440 } 441 442 void 443 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 444 { 445 struct trapframe *tf; 446 struct sigframe *sfp; 447 struct sigacts *psp; 448 struct sigframe sf; 449 struct thread *td; 450 struct proc *p; 451 int oonstack, rndfsize; 452 int sig; 453 int code; 454 455 td = curthread; 456 p = td->td_proc; 457 PROC_LOCK_ASSERT(p, MA_OWNED); 458 sig = ksi->ksi_signo; 459 code = ksi->ksi_code; 460 psp = p->p_sigacts; 461 mtx_assert(&psp->ps_mtx, MA_OWNED); 462 tf = td->td_frame; 463 oonstack = sigonstack(tf->fixreg[1]); 464 465 rndfsize = ((sizeof(sf) + 15) / 16) * 16; 466 467 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 468 catcher, sig); 469 470 /* 471 * Save user context 472 */ 473 memset(&sf, 0, sizeof(sf)); 474 grab_mcontext(td, &sf.sf_uc.uc_mcontext, 0); 475 sf.sf_uc.uc_sigmask = *mask; 476 sf.sf_uc.uc_stack = td->td_sigstk; 477 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 478 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 479 480 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 481 482 /* 483 * Allocate and validate space for the signal handler context. 484 */ 485 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 486 SIGISMEMBER(psp->ps_sigonstack, sig)) { 487 sfp = (struct sigframe *)(td->td_sigstk.ss_sp + 488 td->td_sigstk.ss_size - rndfsize); 489 } else { 490 sfp = (struct sigframe *)(tf->fixreg[1] - rndfsize); 491 } 492 493 /* 494 * Translate the signal if appropriate (Linux emu ?) 495 */ 496 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 497 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 498 499 /* 500 * Save the floating-point state, if necessary, then copy it. 501 */ 502 /* XXX */ 503 504 /* 505 * Set up the registers to return to sigcode. 506 * 507 * r1/sp - sigframe ptr 508 * lr - sig function, dispatched to by blrl in trampoline 509 * r3 - sig number 510 * r4 - SIGINFO ? &siginfo : exception code 511 * r5 - user context 512 * srr0 - trampoline function addr 513 */ 514 tf->lr = (register_t)catcher; 515 tf->fixreg[1] = (register_t)sfp; 516 tf->fixreg[FIRSTARG] = sig; 517 tf->fixreg[FIRSTARG+2] = (register_t)&sfp->sf_uc; 518 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 519 /* 520 * Signal handler installed with SA_SIGINFO. 521 */ 522 tf->fixreg[FIRSTARG+1] = (register_t)&sfp->sf_si; 523 524 /* 525 * Fill siginfo structure. 526 */ 527 sf.sf_si = ksi->ksi_info; 528 sf.sf_si.si_signo = sig; 529 sf.sf_si.si_addr = (void *) ((tf->exc == EXC_DSI) ? 530 tf->dar : tf->srr0); 531 } else { 532 /* Old FreeBSD-style arguments. */ 533 tf->fixreg[FIRSTARG+1] = code; 534 tf->fixreg[FIRSTARG+3] = (tf->exc == EXC_DSI) ? 535 tf->dar : tf->srr0; 536 } 537 mtx_unlock(&psp->ps_mtx); 538 PROC_UNLOCK(p); 539 540 tf->srr0 = (register_t)(PS_STRINGS - *(p->p_sysent->sv_szsigcode)); 541 542 /* 543 * copy the frame out to userland. 544 */ 545 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 546 /* 547 * Process has trashed its stack. Kill it. 548 */ 549 CTR2(KTR_SIG, "sendsig: sigexit td=%p sfp=%p", td, sfp); 550 PROC_LOCK(p); 551 sigexit(td, SIGILL); 552 } 553 554 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, 555 tf->srr0, tf->fixreg[1]); 556 557 PROC_LOCK(p); 558 mtx_lock(&psp->ps_mtx); 559 } 560 561 int 562 sigreturn(struct thread *td, struct sigreturn_args *uap) 563 { 564 struct proc *p; 565 ucontext_t uc; 566 int error; 567 568 CTR2(KTR_SIG, "sigreturn: td=%p ucp=%p", td, uap->sigcntxp); 569 570 if (copyin(uap->sigcntxp, &uc, sizeof(uc)) != 0) { 571 CTR1(KTR_SIG, "sigreturn: efault td=%p", td); 572 return (EFAULT); 573 } 574 575 error = set_mcontext(td, &uc.uc_mcontext); 576 if (error != 0) 577 return (error); 578 579 p = td->td_proc; 580 PROC_LOCK(p); 581 td->td_sigmask = uc.uc_sigmask; 582 SIG_CANTMASK(td->td_sigmask); 583 signotify(td); 584 PROC_UNLOCK(p); 585 586 CTR3(KTR_SIG, "sigreturn: return td=%p pc=%#x sp=%#x", 587 td, uc.uc_mcontext.mc_srr0, uc.uc_mcontext.mc_gpr[1]); 588 589 return (EJUSTRETURN); 590 } 591 592 #ifdef COMPAT_FREEBSD4 593 int 594 freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 595 { 596 597 return sigreturn(td, (struct sigreturn_args *)uap); 598 } 599 #endif 600 601 /* 602 * Construct a PCB from a trapframe. This is called from kdb_trap() where 603 * we want to start a backtrace from the function that caused us to enter 604 * the debugger. We have the context in the trapframe, but base the trace 605 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 606 * enough for a backtrace. 607 */ 608 void 609 makectx(struct trapframe *tf, struct pcb *pcb) 610 { 611 612 pcb->pcb_lr = tf->srr0; 613 pcb->pcb_sp = tf->fixreg[1]; 614 } 615 616 /* 617 * get_mcontext/sendsig helper routine that doesn't touch the 618 * proc lock 619 */ 620 static int 621 grab_mcontext(struct thread *td, mcontext_t *mcp, int flags) 622 { 623 struct pcb *pcb; 624 625 pcb = td->td_pcb; 626 627 memset(mcp, 0, sizeof(mcontext_t)); 628 629 mcp->mc_vers = _MC_VERSION; 630 mcp->mc_flags = 0; 631 memcpy(&mcp->mc_frame, td->td_frame, sizeof(struct trapframe)); 632 if (flags & GET_MC_CLEAR_RET) { 633 mcp->mc_gpr[3] = 0; 634 mcp->mc_gpr[4] = 0; 635 } 636 637 /* 638 * This assumes that floating-point context is *not* lazy, 639 * so if the thread has used FP there would have been a 640 * FP-unavailable exception that would have set things up 641 * correctly. 642 */ 643 if (pcb->pcb_flags & PCB_FPU) { 644 KASSERT(td == curthread, 645 ("get_mcontext: fp save not curthread")); 646 critical_enter(); 647 save_fpu(td); 648 critical_exit(); 649 mcp->mc_flags |= _MC_FP_VALID; 650 memcpy(&mcp->mc_fpscr, &pcb->pcb_fpu.fpscr, sizeof(double)); 651 memcpy(mcp->mc_fpreg, pcb->pcb_fpu.fpr, 32*sizeof(double)); 652 } 653 654 /* XXX Altivec context ? */ 655 656 mcp->mc_len = sizeof(*mcp); 657 658 return (0); 659 } 660 661 int 662 get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 663 { 664 int error; 665 666 error = grab_mcontext(td, mcp, flags); 667 if (error == 0) { 668 PROC_LOCK(curthread->td_proc); 669 mcp->mc_onstack = sigonstack(td->td_frame->fixreg[1]); 670 PROC_UNLOCK(curthread->td_proc); 671 } 672 673 return (error); 674 } 675 676 int 677 set_mcontext(struct thread *td, const mcontext_t *mcp) 678 { 679 struct pcb *pcb; 680 struct trapframe *tf; 681 682 pcb = td->td_pcb; 683 tf = td->td_frame; 684 685 if (mcp->mc_vers != _MC_VERSION || 686 mcp->mc_len != sizeof(*mcp)) 687 return (EINVAL); 688 689 /* 690 * Don't let the user set privileged MSR bits 691 */ 692 if ((mcp->mc_srr1 & PSL_USERSTATIC) != (tf->srr1 & PSL_USERSTATIC)) { 693 return (EINVAL); 694 } 695 696 memcpy(tf, mcp->mc_frame, sizeof(mcp->mc_frame)); 697 698 if (mcp->mc_flags & _MC_FP_VALID) { 699 if ((pcb->pcb_flags & PCB_FPU) != PCB_FPU) { 700 critical_enter(); 701 enable_fpu(td); 702 critical_exit(); 703 } 704 memcpy(&pcb->pcb_fpu.fpscr, &mcp->mc_fpscr, sizeof(double)); 705 memcpy(pcb->pcb_fpu.fpr, mcp->mc_fpreg, 32*sizeof(double)); 706 } 707 708 /* XXX Altivec context? */ 709 710 return (0); 711 } 712 713 void 714 cpu_boot(int howto) 715 { 716 } 717 718 void 719 cpu_initclocks(void) 720 { 721 722 decr_tc_init(); 723 } 724 725 /* Get current clock frequency for the given cpu id. */ 726 int 727 cpu_est_clockrate(int cpu_id, uint64_t *rate) 728 { 729 730 return (ENXIO); 731 } 732 733 /* 734 * Shutdown the CPU as much as possible. 735 */ 736 void 737 cpu_halt(void) 738 { 739 740 OF_exit(); 741 } 742 743 void 744 cpu_idle(void) 745 { 746 /* TODO: Insert code to halt (until next interrupt) */ 747 748 #ifdef INVARIANTS 749 if ((mfmsr() & PSL_EE) != PSL_EE) { 750 struct thread *td = curthread; 751 printf("td msr %x\n", td->td_md.md_saved_msr); 752 panic("ints disabled in idleproc!"); 753 } 754 #endif 755 } 756 757 /* 758 * Set set up registers on exec. 759 */ 760 void 761 exec_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings) 762 { 763 struct trapframe *tf; 764 struct ps_strings arginfo; 765 766 tf = trapframe(td); 767 bzero(tf, sizeof *tf); 768 tf->fixreg[1] = -roundup(-stack + 8, 16); 769 770 /* 771 * XXX Machine-independent code has already copied arguments and 772 * XXX environment to userland. Get them back here. 773 */ 774 (void)copyin((char *)PS_STRINGS, &arginfo, sizeof(arginfo)); 775 776 /* 777 * Set up arguments for _start(): 778 * _start(argc, argv, envp, obj, cleanup, ps_strings); 779 * 780 * Notes: 781 * - obj and cleanup are the auxilliary and termination 782 * vectors. They are fixed up by ld.elf_so. 783 * - ps_strings is a NetBSD extention, and will be 784 * ignored by executables which are strictly 785 * compliant with the SVR4 ABI. 786 * 787 * XXX We have to set both regs and retval here due to different 788 * XXX calling convention in trap.c and init_main.c. 789 */ 790 /* 791 * XXX PG: these get overwritten in the syscall return code. 792 * execve() should return EJUSTRETURN, like it does on NetBSD. 793 * Emulate by setting the syscall return value cells. The 794 * registers still have to be set for init's fork trampoline. 795 */ 796 td->td_retval[0] = arginfo.ps_nargvstr; 797 td->td_retval[1] = (register_t)arginfo.ps_argvstr; 798 tf->fixreg[3] = arginfo.ps_nargvstr; 799 tf->fixreg[4] = (register_t)arginfo.ps_argvstr; 800 tf->fixreg[5] = (register_t)arginfo.ps_envstr; 801 tf->fixreg[6] = 0; /* auxillary vector */ 802 tf->fixreg[7] = 0; /* termination vector */ 803 tf->fixreg[8] = (register_t)PS_STRINGS; /* NetBSD extension */ 804 805 tf->srr0 = entry; 806 tf->srr1 = PSL_MBO | PSL_USERSET | PSL_FE_DFLT; 807 td->td_pcb->pcb_flags = 0; 808 } 809 810 int 811 fill_regs(struct thread *td, struct reg *regs) 812 { 813 struct trapframe *tf; 814 815 tf = td->td_frame; 816 memcpy(regs, tf, sizeof(struct reg)); 817 818 return (0); 819 } 820 821 int 822 fill_dbregs(struct thread *td, struct dbreg *dbregs) 823 { 824 /* No debug registers on PowerPC */ 825 return (ENOSYS); 826 } 827 828 int 829 fill_fpregs(struct thread *td, struct fpreg *fpregs) 830 { 831 struct pcb *pcb; 832 833 pcb = td->td_pcb; 834 835 if ((pcb->pcb_flags & PCB_FPU) == 0) 836 memset(fpregs, 0, sizeof(struct fpreg)); 837 else 838 memcpy(fpregs, &pcb->pcb_fpu, sizeof(struct fpreg)); 839 840 return (0); 841 } 842 843 int 844 set_regs(struct thread *td, struct reg *regs) 845 { 846 struct trapframe *tf; 847 848 tf = td->td_frame; 849 memcpy(tf, regs, sizeof(struct reg)); 850 851 return (0); 852 } 853 854 int 855 set_dbregs(struct thread *td, struct dbreg *dbregs) 856 { 857 /* No debug registers on PowerPC */ 858 return (ENOSYS); 859 } 860 861 int 862 set_fpregs(struct thread *td, struct fpreg *fpregs) 863 { 864 struct pcb *pcb; 865 866 pcb = td->td_pcb; 867 if ((pcb->pcb_flags & PCB_FPU) == 0) 868 enable_fpu(td); 869 memcpy(&pcb->pcb_fpu, fpregs, sizeof(struct fpreg)); 870 871 return (0); 872 } 873 874 int 875 ptrace_set_pc(struct thread *td, unsigned long addr) 876 { 877 struct trapframe *tf; 878 879 tf = td->td_frame; 880 tf->srr0 = (register_t)addr; 881 882 return (0); 883 } 884 885 int 886 ptrace_single_step(struct thread *td) 887 { 888 struct trapframe *tf; 889 890 tf = td->td_frame; 891 tf->srr1 |= PSL_SE; 892 893 return (0); 894 } 895 896 int 897 ptrace_clear_single_step(struct thread *td) 898 { 899 struct trapframe *tf; 900 901 tf = td->td_frame; 902 tf->srr1 &= ~PSL_SE; 903 904 return (0); 905 } 906 907 /* 908 * Initialise a struct pcpu. 909 */ 910 void 911 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz) 912 { 913 914 } 915 916 void 917 spinlock_enter(void) 918 { 919 struct thread *td; 920 921 td = curthread; 922 if (td->td_md.md_spinlock_count == 0) 923 td->td_md.md_saved_msr = intr_disable(); 924 td->td_md.md_spinlock_count++; 925 critical_enter(); 926 } 927 928 void 929 spinlock_exit(void) 930 { 931 struct thread *td; 932 933 td = curthread; 934 critical_exit(); 935 td->td_md.md_spinlock_count--; 936 if (td->td_md.md_spinlock_count == 0) 937 intr_restore(td->td_md.md_saved_msr); 938 } 939 940 /* 941 * kcopy(const void *src, void *dst, size_t len); 942 * 943 * Copy len bytes from src to dst, aborting if we encounter a fatal 944 * page fault. 945 * 946 * kcopy() _must_ save and restore the old fault handler since it is 947 * called by uiomove(), which may be in the path of servicing a non-fatal 948 * page fault. 949 */ 950 int 951 kcopy(const void *src, void *dst, size_t len) 952 { 953 struct thread *td; 954 faultbuf env, *oldfault; 955 int rv; 956 957 td = PCPU_GET(curthread); 958 oldfault = td->td_pcb->pcb_onfault; 959 if ((rv = setfault(env)) != 0) { 960 td->td_pcb->pcb_onfault = oldfault; 961 return rv; 962 } 963 964 memcpy(dst, src, len); 965 966 td->td_pcb->pcb_onfault = oldfault; 967 return (0); 968 } 969 970 void 971 asm_panic(char *pstr) 972 { 973 panic(pstr); 974 } 975 976 int db_trap_glue(struct trapframe *); /* Called from trap_subr.S */ 977 978 int 979 db_trap_glue(struct trapframe *frame) 980 { 981 if (!(frame->srr1 & PSL_PR) 982 && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC 983 || (frame->exc == EXC_PGM 984 && (frame->srr1 & 0x20000)) 985 || frame->exc == EXC_BPT 986 || frame->exc == EXC_DSI)) { 987 int type = frame->exc; 988 if (type == EXC_PGM && (frame->srr1 & 0x20000)) { 989 type = T_BREAKPOINT; 990 } 991 return (kdb_trap(type, 0, frame)); 992 } 993 994 return (0); 995 }
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