1/* 2 * Routines providing a simple monitor for use on the PowerMac. 3 * 4 * Copyright (C) 1996-2005 Paul Mackerras. 5 * Copyright (C) 2001 PPC64 Team, IBM Corp 6 * Copyrignt (C) 2006 Michael Ellerman, IBM Corp 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13#include <linux/errno.h> 14#include <linux/sched.h> 15#include <linux/smp.h> 16#include <linux/mm.h> 17#include <linux/reboot.h> 18#include <linux/delay.h> 19#include <linux/kallsyms.h> 20#include <linux/kmsg_dump.h> 21#include <linux/cpumask.h> 22#include <linux/export.h> 23#include <linux/sysrq.h> 24#include <linux/interrupt.h> 25#include <linux/irq.h> 26#include <linux/bug.h> 27#include <linux/nmi.h> 28#include <linux/ctype.h> 29 30#include <asm/ptrace.h> 31#include <asm/string.h> 32#include <asm/prom.h> 33#include <asm/machdep.h> 34#include <asm/xmon.h> 35#include <asm/processor.h> 36#include <asm/pgtable.h> 37#include <asm/mmu.h> 38#include <asm/mmu_context.h> 39#include <asm/cputable.h> 40#include <asm/rtas.h> 41#include <asm/sstep.h> 42#include <asm/irq_regs.h> 43#include <asm/spu.h> 44#include <asm/spu_priv1.h> 45#include <asm/setjmp.h> 46#include <asm/reg.h> 47#include <asm/debug.h> 48#include <asm/hw_breakpoint.h> 49 50#ifdef CONFIG_PPC64 51#include <asm/hvcall.h> 52#include <asm/paca.h> 53#endif 54 55#if defined(CONFIG_PPC_SPLPAR) 56#include <asm/plpar_wrappers.h> 57#else 58static inline long plapr_set_ciabr(unsigned long ciabr) {return 0; }; 59#endif 60 61#include "nonstdio.h" 62#include "dis-asm.h" 63 64#ifdef CONFIG_SMP 65static cpumask_t cpus_in_xmon = CPU_MASK_NONE; 66static unsigned long xmon_taken = 1; 67static int xmon_owner; 68static int xmon_gate; 69#else 70#define xmon_owner 0 71#endif /* CONFIG_SMP */ 72 73static unsigned long in_xmon __read_mostly = 0; 74 75static unsigned long adrs; 76static int size = 1; 77#define MAX_DUMP (128 * 1024) 78static unsigned long ndump = 64; 79static unsigned long nidump = 16; 80static unsigned long ncsum = 4096; 81static int termch; 82static char tmpstr[128]; 83 84static long bus_error_jmp[JMP_BUF_LEN]; 85static int catch_memory_errors; 86static long *xmon_fault_jmp[NR_CPUS]; 87 88/* Breakpoint stuff */ 89struct bpt { 90 unsigned long address; 91 unsigned int instr[2]; 92 atomic_t ref_count; 93 int enabled; 94 unsigned long pad; 95}; 96 97/* Bits in bpt.enabled */ 98#define BP_CIABR 1 99#define BP_TRAP 2 100#define BP_DABR 4 101 102#define NBPTS 256 103static struct bpt bpts[NBPTS]; 104static struct bpt dabr; 105static struct bpt *iabr; 106static unsigned bpinstr = 0x7fe00008; /* trap */ 107 108#define BP_NUM(bp) ((bp) - bpts + 1) 109 110/* Prototypes */ 111static int cmds(struct pt_regs *); 112static int mread(unsigned long, void *, int); 113static int mwrite(unsigned long, void *, int); 114static int handle_fault(struct pt_regs *); 115static void byterev(unsigned char *, int); 116static void memex(void); 117static int bsesc(void); 118static void dump(void); 119static void prdump(unsigned long, long); 120static int ppc_inst_dump(unsigned long, long, int); 121static void dump_log_buf(void); 122static void backtrace(struct pt_regs *); 123static void excprint(struct pt_regs *); 124static void prregs(struct pt_regs *); 125static void memops(int); 126static void memlocate(void); 127static void memzcan(void); 128static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned); 129int skipbl(void); 130int scanhex(unsigned long *valp); 131static void scannl(void); 132static int hexdigit(int); 133void getstring(char *, int); 134static void flush_input(void); 135static int inchar(void); 136static void take_input(char *); 137static unsigned long read_spr(int); 138static void write_spr(int, unsigned long); 139static void super_regs(void); 140static void remove_bpts(void); 141static void insert_bpts(void); 142static void remove_cpu_bpts(void); 143static void insert_cpu_bpts(void); 144static struct bpt *at_breakpoint(unsigned long pc); 145static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp); 146static int do_step(struct pt_regs *); 147static void bpt_cmds(void); 148static void cacheflush(void); 149static int cpu_cmd(void); 150static void csum(void); 151static void bootcmds(void); 152static void proccall(void); 153void dump_segments(void); 154static void symbol_lookup(void); 155static void xmon_show_stack(unsigned long sp, unsigned long lr, 156 unsigned long pc); 157static void xmon_print_symbol(unsigned long address, const char *mid, 158 const char *after); 159static const char *getvecname(unsigned long vec); 160 161static int do_spu_cmd(void); 162 163#ifdef CONFIG_44x 164static void dump_tlb_44x(void); 165#endif 166#ifdef CONFIG_PPC_BOOK3E 167static void dump_tlb_book3e(void); 168#endif 169 170static int xmon_no_auto_backtrace; 171 172extern void xmon_enter(void); 173extern void xmon_leave(void); 174 175#ifdef CONFIG_PPC64 176#define REG "%.16lx" 177#else 178#define REG "%.8lx" 179#endif 180 181#ifdef __LITTLE_ENDIAN__ 182#define GETWORD(v) (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0]) 183#else 184#define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3]) 185#endif 186 187static char *help_string = "\ 188Commands:\n\ 189 b show breakpoints\n\ 190 bd set data breakpoint\n\ 191 bi set instruction breakpoint\n\ 192 bc clear breakpoint\n" 193#ifdef CONFIG_SMP 194 "\ 195 c print cpus stopped in xmon\n\ 196 c# try to switch to cpu number h (in hex)\n" 197#endif 198 "\ 199 C checksum\n\ 200 d dump bytes\n\ 201 di dump instructions\n\ 202 df dump float values\n\ 203 dd dump double values\n\ 204 dl dump the kernel log buffer\n" 205#ifdef CONFIG_PPC64 206 "\ 207 dp[#] dump paca for current cpu, or cpu #\n\ 208 dpa dump paca for all possible cpus\n" 209#endif 210 "\ 211 dr dump stream of raw bytes\n\ 212 e print exception information\n\ 213 f flush cache\n\ 214 la lookup symbol+offset of specified address\n\ 215 ls lookup address of specified symbol\n\ 216 m examine/change memory\n\ 217 mm move a block of memory\n\ 218 ms set a block of memory\n\ 219 md compare two blocks of memory\n\ 220 ml locate a block of memory\n\ 221 mz zero a block of memory\n\ 222 mi show information about memory allocation\n\ 223 p call a procedure\n\ 224 r print registers\n\ 225 s single step\n" 226#ifdef CONFIG_SPU_BASE 227" ss stop execution on all spus\n\ 228 sr restore execution on stopped spus\n\ 229 sf # dump spu fields for spu # (in hex)\n\ 230 sd # dump spu local store for spu # (in hex)\n\ 231 sdi # disassemble spu local store for spu # (in hex)\n" 232#endif 233" S print special registers\n\ 234 t print backtrace\n\ 235 x exit monitor and recover\n\ 236 X exit monitor and dont recover\n" 237#if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E) 238" u dump segment table or SLB\n" 239#elif defined(CONFIG_PPC_STD_MMU_32) 240" u dump segment registers\n" 241#elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E) 242" u dump TLB\n" 243#endif 244" ? help\n" 245" zr reboot\n\ 246 zh halt\n" 247; 248 249static struct pt_regs *xmon_regs; 250 251static inline void sync(void) 252{ 253 asm volatile("sync; isync"); 254} 255 256static inline void store_inst(void *p) 257{ 258 asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p)); 259} 260 261static inline void cflush(void *p) 262{ 263 asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p)); 264} 265 266static inline void cinval(void *p) 267{ 268 asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p)); 269} 270 271/** 272 * write_ciabr() - write the CIABR SPR 273 * @ciabr: The value to write. 274 * 275 * This function writes a value to the CIARB register either directly 276 * through mtspr instruction if the kernel is in HV privilege mode or 277 * call a hypervisor function to achieve the same in case the kernel 278 * is in supervisor privilege mode. 279 */ 280static void write_ciabr(unsigned long ciabr) 281{ 282 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 283 return; 284 285 if (cpu_has_feature(CPU_FTR_HVMODE)) { 286 mtspr(SPRN_CIABR, ciabr); 287 return; 288 } 289 plapr_set_ciabr(ciabr); 290} 291 292/** 293 * set_ciabr() - set the CIABR 294 * @addr: The value to set. 295 * 296 * This function sets the correct privilege value into the the HW 297 * breakpoint address before writing it up in the CIABR register. 298 */ 299static void set_ciabr(unsigned long addr) 300{ 301 addr &= ~CIABR_PRIV; 302 303 if (cpu_has_feature(CPU_FTR_HVMODE)) 304 addr |= CIABR_PRIV_HYPER; 305 else 306 addr |= CIABR_PRIV_SUPER; 307 write_ciabr(addr); 308} 309 310/* 311 * Disable surveillance (the service processor watchdog function) 312 * while we are in xmon. 313 * XXX we should re-enable it when we leave. :) 314 */ 315#define SURVEILLANCE_TOKEN 9000 316 317static inline void disable_surveillance(void) 318{ 319#ifdef CONFIG_PPC_PSERIES 320 /* Since this can't be a module, args should end up below 4GB. */ 321 static struct rtas_args args; 322 323 /* 324 * At this point we have got all the cpus we can into 325 * xmon, so there is hopefully no other cpu calling RTAS 326 * at the moment, even though we don't take rtas.lock. 327 * If we did try to take rtas.lock there would be a 328 * real possibility of deadlock. 329 */ 330 args.token = rtas_token("set-indicator"); 331 if (args.token == RTAS_UNKNOWN_SERVICE) 332 return; 333 args.token = cpu_to_be32(args.token); 334 args.nargs = cpu_to_be32(3); 335 args.nret = cpu_to_be32(1); 336 args.rets = &args.args[3]; 337 args.args[0] = cpu_to_be32(SURVEILLANCE_TOKEN); 338 args.args[1] = 0; 339 args.args[2] = 0; 340 enter_rtas(__pa(&args)); 341#endif /* CONFIG_PPC_PSERIES */ 342} 343 344#ifdef CONFIG_SMP 345static int xmon_speaker; 346 347static void get_output_lock(void) 348{ 349 int me = smp_processor_id() + 0x100; 350 int last_speaker = 0, prev; 351 long timeout; 352 353 if (xmon_speaker == me) 354 return; 355 356 for (;;) { 357 last_speaker = cmpxchg(&xmon_speaker, 0, me); 358 if (last_speaker == 0) 359 return; 360 361 /* 362 * Wait a full second for the lock, we might be on a slow 363 * console, but check every 100us. 364 */ 365 timeout = 10000; 366 while (xmon_speaker == last_speaker) { 367 if (--timeout > 0) { 368 udelay(100); 369 continue; 370 } 371 372 /* hostile takeover */ 373 prev = cmpxchg(&xmon_speaker, last_speaker, me); 374 if (prev == last_speaker) 375 return; 376 break; 377 } 378 } 379} 380 381static void release_output_lock(void) 382{ 383 xmon_speaker = 0; 384} 385 386int cpus_are_in_xmon(void) 387{ 388 return !cpumask_empty(&cpus_in_xmon); 389} 390#endif 391 392static inline int unrecoverable_excp(struct pt_regs *regs) 393{ 394#if defined(CONFIG_4xx) || defined(CONFIG_PPC_BOOK3E) 395 /* We have no MSR_RI bit on 4xx or Book3e, so we simply return false */ 396 return 0; 397#else 398 return ((regs->msr & MSR_RI) == 0); 399#endif 400} 401 402static int xmon_core(struct pt_regs *regs, int fromipi) 403{ 404 int cmd = 0; 405 struct bpt *bp; 406 long recurse_jmp[JMP_BUF_LEN]; 407 unsigned long offset; 408 unsigned long flags; 409#ifdef CONFIG_SMP 410 int cpu; 411 int secondary; 412 unsigned long timeout; 413#endif 414 415 local_irq_save(flags); 416 hard_irq_disable(); 417 418 bp = in_breakpoint_table(regs->nip, &offset); 419 if (bp != NULL) { 420 regs->nip = bp->address + offset; 421 atomic_dec(&bp->ref_count); 422 } 423 424 remove_cpu_bpts(); 425 426#ifdef CONFIG_SMP 427 cpu = smp_processor_id(); 428 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { 429 get_output_lock(); 430 excprint(regs); 431 printf("cpu 0x%x: Exception %lx %s in xmon, " 432 "returning to main loop\n", 433 cpu, regs->trap, getvecname(TRAP(regs))); 434 release_output_lock(); 435 longjmp(xmon_fault_jmp[cpu], 1); 436 } 437 438 if (setjmp(recurse_jmp) != 0) { 439 if (!in_xmon || !xmon_gate) { 440 get_output_lock(); 441 printf("xmon: WARNING: bad recursive fault " 442 "on cpu 0x%x\n", cpu); 443 release_output_lock(); 444 goto waiting; 445 } 446 secondary = !(xmon_taken && cpu == xmon_owner); 447 goto cmdloop; 448 } 449 450 xmon_fault_jmp[cpu] = recurse_jmp; 451 452 bp = NULL; 453 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) 454 bp = at_breakpoint(regs->nip); 455 if (bp || unrecoverable_excp(regs)) 456 fromipi = 0; 457 458 if (!fromipi) { 459 get_output_lock(); 460 excprint(regs); 461 if (bp) { 462 printf("cpu 0x%x stopped at breakpoint 0x%lx (", 463 cpu, BP_NUM(bp)); 464 xmon_print_symbol(regs->nip, " ", ")\n"); 465 } 466 if (unrecoverable_excp(regs)) 467 printf("WARNING: exception is not recoverable, " 468 "can't continue\n"); 469 release_output_lock(); 470 } 471 472 cpumask_set_cpu(cpu, &cpus_in_xmon); 473 474 waiting: 475 secondary = 1; 476 while (secondary && !xmon_gate) { 477 if (in_xmon == 0) { 478 if (fromipi) 479 goto leave; 480 secondary = test_and_set_bit(0, &in_xmon); 481 } 482 barrier(); 483 } 484 485 if (!secondary && !xmon_gate) { 486 /* we are the first cpu to come in */ 487 /* interrupt other cpu(s) */ 488 int ncpus = num_online_cpus(); 489 490 xmon_owner = cpu; 491 mb(); 492 if (ncpus > 1) { 493 smp_send_debugger_break(); 494 /* wait for other cpus to come in */ 495 for (timeout = 100000000; timeout != 0; --timeout) { 496 if (cpumask_weight(&cpus_in_xmon) >= ncpus) 497 break; 498 barrier(); 499 } 500 } 501 remove_bpts(); 502 disable_surveillance(); 503 /* for breakpoint or single step, print the current instr. */ 504 if (bp || TRAP(regs) == 0xd00) 505 ppc_inst_dump(regs->nip, 1, 0); 506 printf("enter ? for help\n"); 507 mb(); 508 xmon_gate = 1; 509 barrier(); 510 } 511 512 cmdloop: 513 while (in_xmon) { 514 if (secondary) { 515 if (cpu == xmon_owner) { 516 if (!test_and_set_bit(0, &xmon_taken)) { 517 secondary = 0; 518 continue; 519 } 520 /* missed it */ 521 while (cpu == xmon_owner) 522 barrier(); 523 } 524 barrier(); 525 } else { 526 cmd = cmds(regs); 527 if (cmd != 0) { 528 /* exiting xmon */ 529 insert_bpts(); 530 xmon_gate = 0; 531 wmb(); 532 in_xmon = 0; 533 break; 534 } 535 /* have switched to some other cpu */ 536 secondary = 1; 537 } 538 } 539 leave: 540 cpumask_clear_cpu(cpu, &cpus_in_xmon); 541 xmon_fault_jmp[cpu] = NULL; 542#else 543 /* UP is simple... */ 544 if (in_xmon) { 545 printf("Exception %lx %s in xmon, returning to main loop\n", 546 regs->trap, getvecname(TRAP(regs))); 547 longjmp(xmon_fault_jmp[0], 1); 548 } 549 if (setjmp(recurse_jmp) == 0) { 550 xmon_fault_jmp[0] = recurse_jmp; 551 in_xmon = 1; 552 553 excprint(regs); 554 bp = at_breakpoint(regs->nip); 555 if (bp) { 556 printf("Stopped at breakpoint %lx (", BP_NUM(bp)); 557 xmon_print_symbol(regs->nip, " ", ")\n"); 558 } 559 if (unrecoverable_excp(regs)) 560 printf("WARNING: exception is not recoverable, " 561 "can't continue\n"); 562 remove_bpts(); 563 disable_surveillance(); 564 /* for breakpoint or single step, print the current instr. */ 565 if (bp || TRAP(regs) == 0xd00) 566 ppc_inst_dump(regs->nip, 1, 0); 567 printf("enter ? for help\n"); 568 } 569 570 cmd = cmds(regs); 571 572 insert_bpts(); 573 in_xmon = 0; 574#endif 575 576#ifdef CONFIG_BOOKE 577 if (regs->msr & MSR_DE) { 578 bp = at_breakpoint(regs->nip); 579 if (bp != NULL) { 580 regs->nip = (unsigned long) &bp->instr[0]; 581 atomic_inc(&bp->ref_count); 582 } 583 } 584#else 585 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { 586 bp = at_breakpoint(regs->nip); 587 if (bp != NULL) { 588 int stepped = emulate_step(regs, bp->instr[0]); 589 if (stepped == 0) { 590 regs->nip = (unsigned long) &bp->instr[0]; 591 atomic_inc(&bp->ref_count); 592 } else if (stepped < 0) { 593 printf("Couldn't single-step %s instruction\n", 594 (IS_RFID(bp->instr[0])? "rfid": "mtmsrd")); 595 } 596 } 597 } 598#endif 599 insert_cpu_bpts(); 600 601 touch_nmi_watchdog(); 602 local_irq_restore(flags); 603 604 return cmd != 'X' && cmd != EOF; 605} 606 607int xmon(struct pt_regs *excp) 608{ 609 struct pt_regs regs; 610 611 if (excp == NULL) { 612 ppc_save_regs(®s); 613 excp = ®s; 614 } 615 616 return xmon_core(excp, 0); 617} 618EXPORT_SYMBOL(xmon); 619 620irqreturn_t xmon_irq(int irq, void *d) 621{ 622 unsigned long flags; 623 local_irq_save(flags); 624 printf("Keyboard interrupt\n"); 625 xmon(get_irq_regs()); 626 local_irq_restore(flags); 627 return IRQ_HANDLED; 628} 629 630static int xmon_bpt(struct pt_regs *regs) 631{ 632 struct bpt *bp; 633 unsigned long offset; 634 635 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 636 return 0; 637 638 /* Are we at the trap at bp->instr[1] for some bp? */ 639 bp = in_breakpoint_table(regs->nip, &offset); 640 if (bp != NULL && offset == 4) { 641 regs->nip = bp->address + 4; 642 atomic_dec(&bp->ref_count); 643 return 1; 644 } 645 646 /* Are we at a breakpoint? */ 647 bp = at_breakpoint(regs->nip); 648 if (!bp) 649 return 0; 650 651 xmon_core(regs, 0); 652 653 return 1; 654} 655 656static int xmon_sstep(struct pt_regs *regs) 657{ 658 if (user_mode(regs)) 659 return 0; 660 xmon_core(regs, 0); 661 return 1; 662} 663 664static int xmon_break_match(struct pt_regs *regs) 665{ 666 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 667 return 0; 668 if (dabr.enabled == 0) 669 return 0; 670 xmon_core(regs, 0); 671 return 1; 672} 673 674static int xmon_iabr_match(struct pt_regs *regs) 675{ 676 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 677 return 0; 678 if (iabr == NULL) 679 return 0; 680 xmon_core(regs, 0); 681 return 1; 682} 683 684static int xmon_ipi(struct pt_regs *regs) 685{ 686#ifdef CONFIG_SMP 687 if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon)) 688 xmon_core(regs, 1); 689#endif 690 return 0; 691} 692 693static int xmon_fault_handler(struct pt_regs *regs) 694{ 695 struct bpt *bp; 696 unsigned long offset; 697 698 if (in_xmon && catch_memory_errors) 699 handle_fault(regs); /* doesn't return */ 700 701 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { 702 bp = in_breakpoint_table(regs->nip, &offset); 703 if (bp != NULL) { 704 regs->nip = bp->address + offset; 705 atomic_dec(&bp->ref_count); 706 } 707 } 708 709 return 0; 710} 711 712static struct bpt *at_breakpoint(unsigned long pc) 713{ 714 int i; 715 struct bpt *bp; 716 717 bp = bpts; 718 for (i = 0; i < NBPTS; ++i, ++bp) 719 if (bp->enabled && pc == bp->address) 720 return bp; 721 return NULL; 722} 723 724static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp) 725{ 726 unsigned long off; 727 728 off = nip - (unsigned long) bpts; 729 if (off >= sizeof(bpts)) 730 return NULL; 731 off %= sizeof(struct bpt); 732 if (off != offsetof(struct bpt, instr[0]) 733 && off != offsetof(struct bpt, instr[1])) 734 return NULL; 735 *offp = off - offsetof(struct bpt, instr[0]); 736 return (struct bpt *) (nip - off); 737} 738 739static struct bpt *new_breakpoint(unsigned long a) 740{ 741 struct bpt *bp; 742 743 a &= ~3UL; 744 bp = at_breakpoint(a); 745 if (bp) 746 return bp; 747 748 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { 749 if (!bp->enabled && atomic_read(&bp->ref_count) == 0) { 750 bp->address = a; 751 bp->instr[1] = bpinstr; 752 store_inst(&bp->instr[1]); 753 return bp; 754 } 755 } 756 757 printf("Sorry, no free breakpoints. Please clear one first.\n"); 758 return NULL; 759} 760 761static void insert_bpts(void) 762{ 763 int i; 764 struct bpt *bp; 765 766 bp = bpts; 767 for (i = 0; i < NBPTS; ++i, ++bp) { 768 if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0) 769 continue; 770 if (mread(bp->address, &bp->instr[0], 4) != 4) { 771 printf("Couldn't read instruction at %lx, " 772 "disabling breakpoint there\n", bp->address); 773 bp->enabled = 0; 774 continue; 775 } 776 if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) { 777 printf("Breakpoint at %lx is on an mtmsrd or rfid " 778 "instruction, disabling it\n", bp->address); 779 bp->enabled = 0; 780 continue; 781 } 782 store_inst(&bp->instr[0]); 783 if (bp->enabled & BP_CIABR) 784 continue; 785 if (mwrite(bp->address, &bpinstr, 4) != 4) { 786 printf("Couldn't write instruction at %lx, " 787 "disabling breakpoint there\n", bp->address); 788 bp->enabled &= ~BP_TRAP; 789 continue; 790 } 791 store_inst((void *)bp->address); 792 } 793} 794 795static void insert_cpu_bpts(void) 796{ 797 struct arch_hw_breakpoint brk; 798 799 if (dabr.enabled) { 800 brk.address = dabr.address; 801 brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL; 802 brk.len = 8; 803 __set_breakpoint(&brk); 804 } 805 806 if (iabr) 807 set_ciabr(iabr->address); 808} 809 810static void remove_bpts(void) 811{ 812 int i; 813 struct bpt *bp; 814 unsigned instr; 815 816 bp = bpts; 817 for (i = 0; i < NBPTS; ++i, ++bp) { 818 if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP) 819 continue; 820 if (mread(bp->address, &instr, 4) == 4 821 && instr == bpinstr 822 && mwrite(bp->address, &bp->instr, 4) != 4) 823 printf("Couldn't remove breakpoint at %lx\n", 824 bp->address); 825 else 826 store_inst((void *)bp->address); 827 } 828} 829 830static void remove_cpu_bpts(void) 831{ 832 hw_breakpoint_disable(); 833 write_ciabr(0); 834} 835 836/* Command interpreting routine */ 837static char *last_cmd; 838 839static int 840cmds(struct pt_regs *excp) 841{ 842 int cmd = 0; 843 844 last_cmd = NULL; 845 xmon_regs = excp; 846 847 if (!xmon_no_auto_backtrace) { 848 xmon_no_auto_backtrace = 1; 849 xmon_show_stack(excp->gpr[1], excp->link, excp->nip); 850 } 851 852 for(;;) { 853#ifdef CONFIG_SMP 854 printf("%x:", smp_processor_id()); 855#endif /* CONFIG_SMP */ 856 printf("mon> "); 857 flush_input(); 858 termch = 0; 859 cmd = skipbl(); 860 if( cmd == '\n' ) { 861 if (last_cmd == NULL) 862 continue; 863 take_input(last_cmd); 864 last_cmd = NULL; 865 cmd = inchar(); 866 } 867 switch (cmd) { 868 case 'm': 869 cmd = inchar(); 870 switch (cmd) { 871 case 'm': 872 case 's': 873 case 'd': 874 memops(cmd); 875 break; 876 case 'l': 877 memlocate(); 878 break; 879 case 'z': 880 memzcan(); 881 break; 882 case 'i': 883 show_mem(0); 884 break; 885 default: 886 termch = cmd; 887 memex(); 888 } 889 break; 890 case 'd': 891 dump(); 892 break; 893 case 'l': 894 symbol_lookup(); 895 break; 896 case 'r': 897 prregs(excp); /* print regs */ 898 break; 899 case 'e': 900 excprint(excp); 901 break; 902 case 'S': 903 super_regs(); 904 break; 905 case 't': 906 backtrace(excp); 907 break; 908 case 'f': 909 cacheflush(); 910 break; 911 case 's': 912 if (do_spu_cmd() == 0) 913 break; 914 if (do_step(excp)) 915 return cmd; 916 break; 917 case 'x': 918 case 'X': 919 return cmd; 920 case EOF: 921 printf(" <no input ...>\n"); 922 mdelay(2000); 923 return cmd; 924 case '?': 925 xmon_puts(help_string); 926 break; 927 case 'b': 928 bpt_cmds(); 929 break; 930 case 'C': 931 csum(); 932 break; 933 case 'c': 934 if (cpu_cmd()) 935 return 0; 936 break; 937 case 'z': 938 bootcmds(); 939 break; 940 case 'p': 941 proccall(); 942 break; 943#ifdef CONFIG_PPC_STD_MMU 944 case 'u': 945 dump_segments(); 946 break; 947#elif defined(CONFIG_44x) 948 case 'u': 949 dump_tlb_44x(); 950 break; 951#elif defined(CONFIG_PPC_BOOK3E) 952 case 'u': 953 dump_tlb_book3e(); 954 break; 955#endif 956 default: 957 printf("Unrecognized command: "); 958 do { 959 if (' ' < cmd && cmd <= '~') 960 putchar(cmd); 961 else 962 printf("\\x%x", cmd); 963 cmd = inchar(); 964 } while (cmd != '\n'); 965 printf(" (type ? for help)\n"); 966 break; 967 } 968 } 969} 970 971#ifdef CONFIG_BOOKE 972static int do_step(struct pt_regs *regs) 973{ 974 regs->msr |= MSR_DE; 975 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); 976 return 1; 977} 978#else 979/* 980 * Step a single instruction. 981 * Some instructions we emulate, others we execute with MSR_SE set. 982 */ 983static int do_step(struct pt_regs *regs) 984{ 985 unsigned int instr; 986 int stepped; 987 988 /* check we are in 64-bit kernel mode, translation enabled */ 989 if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) { 990 if (mread(regs->nip, &instr, 4) == 4) { 991 stepped = emulate_step(regs, instr); 992 if (stepped < 0) { 993 printf("Couldn't single-step %s instruction\n", 994 (IS_RFID(instr)? "rfid": "mtmsrd")); 995 return 0; 996 } 997 if (stepped > 0) { 998 regs->trap = 0xd00 | (regs->trap & 1); 999 printf("stepped to "); 1000 xmon_print_symbol(regs->nip, " ", "\n"); 1001 ppc_inst_dump(regs->nip, 1, 0); 1002 return 0; 1003 } 1004 } 1005 } 1006 regs->msr |= MSR_SE; 1007 return 1; 1008} 1009#endif 1010 1011static void bootcmds(void) 1012{ 1013 int cmd; 1014 1015 cmd = inchar(); 1016 if (cmd == 'r') 1017 ppc_md.restart(NULL); 1018 else if (cmd == 'h') 1019 ppc_md.halt(); 1020 else if (cmd == 'p') 1021 if (pm_power_off) 1022 pm_power_off(); 1023} 1024 1025static int cpu_cmd(void) 1026{ 1027#ifdef CONFIG_SMP 1028 unsigned long cpu, first_cpu, last_cpu; 1029 int timeout; 1030 1031 if (!scanhex(&cpu)) { 1032 /* print cpus waiting or in xmon */ 1033 printf("cpus stopped:"); 1034 last_cpu = first_cpu = NR_CPUS; 1035 for_each_possible_cpu(cpu) { 1036 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { 1037 if (cpu == last_cpu + 1) { 1038 last_cpu = cpu; 1039 } else { 1040 if (last_cpu != first_cpu) 1041 printf("-0x%lx", last_cpu); 1042 last_cpu = first_cpu = cpu; 1043 printf(" 0x%lx", cpu); 1044 } 1045 } 1046 } 1047 if (last_cpu != first_cpu) 1048 printf("-0x%lx", last_cpu); 1049 printf("\n"); 1050 return 0; 1051 } 1052 /* try to switch to cpu specified */ 1053 if (!cpumask_test_cpu(cpu, &cpus_in_xmon)) { 1054 printf("cpu 0x%x isn't in xmon\n", cpu); 1055 return 0; 1056 } 1057 xmon_taken = 0; 1058 mb(); 1059 xmon_owner = cpu; 1060 timeout = 10000000; 1061 while (!xmon_taken) { 1062 if (--timeout == 0) { 1063 if (test_and_set_bit(0, &xmon_taken)) 1064 break; 1065 /* take control back */ 1066 mb(); 1067 xmon_owner = smp_processor_id(); 1068 printf("cpu 0x%x didn't take control\n", cpu); 1069 return 0; 1070 } 1071 barrier(); 1072 } 1073 return 1; 1074#else 1075 return 0; 1076#endif /* CONFIG_SMP */ 1077} 1078 1079static unsigned short fcstab[256] = { 1080 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 1081 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 1082 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 1083 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 1084 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 1085 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 1086 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 1087 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 1088 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 1089 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 1090 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 1091 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 1092 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 1093 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 1094 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 1095 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 1096 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 1097 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 1098 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 1099 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 1100 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 1101 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 1102 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 1103 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 1104 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 1105 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 1106 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 1107 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 1108 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 1109 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 1110 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 1111 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 1112}; 1113 1114#define FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff]) 1115 1116static void 1117csum(void) 1118{ 1119 unsigned int i; 1120 unsigned short fcs; 1121 unsigned char v; 1122 1123 if (!scanhex(&adrs)) 1124 return; 1125 if (!scanhex(&ncsum)) 1126 return; 1127 fcs = 0xffff; 1128 for (i = 0; i < ncsum; ++i) { 1129 if (mread(adrs+i, &v, 1) == 0) { 1130 printf("csum stopped at "REG"\n", adrs+i); 1131 break; 1132 } 1133 fcs = FCS(fcs, v); 1134 } 1135 printf("%x\n", fcs); 1136} 1137 1138/* 1139 * Check if this is a suitable place to put a breakpoint. 1140 */ 1141static long check_bp_loc(unsigned long addr) 1142{ 1143 unsigned int instr; 1144 1145 addr &= ~3; 1146 if (!is_kernel_addr(addr)) { 1147 printf("Breakpoints may only be placed at kernel addresses\n"); 1148 return 0; 1149 } 1150 if (!mread(addr, &instr, sizeof(instr))) { 1151 printf("Can't read instruction at address %lx\n", addr); 1152 return 0; 1153 } 1154 if (IS_MTMSRD(instr) || IS_RFID(instr)) { 1155 printf("Breakpoints may not be placed on mtmsrd or rfid " 1156 "instructions\n"); 1157 return 0; 1158 } 1159 return 1; 1160} 1161 1162static char *breakpoint_help_string = 1163 "Breakpoint command usage:\n" 1164 "b show breakpoints\n" 1165 "b <addr> [cnt] set breakpoint at given instr addr\n" 1166 "bc clear all breakpoints\n" 1167 "bc <n/addr> clear breakpoint number n or at addr\n" 1168 "bi <addr> [cnt] set hardware instr breakpoint (POWER8 only)\n" 1169 "bd <addr> [cnt] set hardware data breakpoint\n" 1170 ""; 1171 1172static void 1173bpt_cmds(void) 1174{ 1175 int cmd; 1176 unsigned long a; 1177 int mode, i; 1178 struct bpt *bp; 1179 const char badaddr[] = "Only kernel addresses are permitted " 1180 "for breakpoints\n"; 1181 1182 cmd = inchar(); 1183 switch (cmd) { 1184#ifndef CONFIG_8xx 1185 case 'd': /* bd - hardware data breakpoint */ 1186 mode = 7; 1187 cmd = inchar(); 1188 if (cmd == 'r') 1189 mode = 5; 1190 else if (cmd == 'w') 1191 mode = 6; 1192 else 1193 termch = cmd; 1194 dabr.address = 0; 1195 dabr.enabled = 0; 1196 if (scanhex(&dabr.address)) { 1197 if (!is_kernel_addr(dabr.address)) { 1198 printf(badaddr); 1199 break; 1200 } 1201 dabr.address &= ~HW_BRK_TYPE_DABR; 1202 dabr.enabled = mode | BP_DABR; 1203 } 1204 break; 1205 1206 case 'i': /* bi - hardware instr breakpoint */ 1207 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) { 1208 printf("Hardware instruction breakpoint " 1209 "not supported on this cpu\n"); 1210 break; 1211 } 1212 if (iabr) { 1213 iabr->enabled &= ~BP_CIABR; 1214 iabr = NULL; 1215 } 1216 if (!scanhex(&a)) 1217 break; 1218 if (!check_bp_loc(a)) 1219 break; 1220 bp = new_breakpoint(a); 1221 if (bp != NULL) { 1222 bp->enabled |= BP_CIABR; 1223 iabr = bp; 1224 } 1225 break; 1226#endif 1227 1228 case 'c': 1229 if (!scanhex(&a)) { 1230 /* clear all breakpoints */ 1231 for (i = 0; i < NBPTS; ++i) 1232 bpts[i].enabled = 0; 1233 iabr = NULL; 1234 dabr.enabled = 0; 1235 printf("All breakpoints cleared\n"); 1236 break; 1237 } 1238 1239 if (a <= NBPTS && a >= 1) { 1240 /* assume a breakpoint number */ 1241 bp = &bpts[a-1]; /* bp nums are 1 based */ 1242 } else { 1243 /* assume a breakpoint address */ 1244 bp = at_breakpoint(a); 1245 if (bp == NULL) { 1246 printf("No breakpoint at %lx\n", a); 1247 break; 1248 } 1249 } 1250 1251 printf("Cleared breakpoint %lx (", BP_NUM(bp)); 1252 xmon_print_symbol(bp->address, " ", ")\n"); 1253 bp->enabled = 0; 1254 break; 1255 1256 default: 1257 termch = cmd; 1258 cmd = skipbl(); 1259 if (cmd == '?') { 1260 printf(breakpoint_help_string); 1261 break; 1262 } 1263 termch = cmd; 1264 if (!scanhex(&a)) { 1265 /* print all breakpoints */ 1266 printf(" type address\n"); 1267 if (dabr.enabled) { 1268 printf(" data "REG" [", dabr.address); 1269 if (dabr.enabled & 1) 1270 printf("r"); 1271 if (dabr.enabled & 2) 1272 printf("w"); 1273 printf("]\n"); 1274 } 1275 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { 1276 if (!bp->enabled) 1277 continue; 1278 printf("%2x %s ", BP_NUM(bp), 1279 (bp->enabled & BP_CIABR) ? "inst": "trap"); 1280 xmon_print_symbol(bp->address, " ", "\n"); 1281 } 1282 break; 1283 } 1284 1285 if (!check_bp_loc(a)) 1286 break; 1287 bp = new_breakpoint(a); 1288 if (bp != NULL) 1289 bp->enabled |= BP_TRAP; 1290 break; 1291 } 1292} 1293 1294/* Very cheap human name for vector lookup. */ 1295static 1296const char *getvecname(unsigned long vec) 1297{ 1298 char *ret; 1299 1300 switch (vec) { 1301 case 0x100: ret = "(System Reset)"; break; 1302 case 0x200: ret = "(Machine Check)"; break; 1303 case 0x300: ret = "(Data Access)"; break; 1304 case 0x380: ret = "(Data SLB Access)"; break; 1305 case 0x400: ret = "(Instruction Access)"; break; 1306 case 0x480: ret = "(Instruction SLB Access)"; break; 1307 case 0x500: ret = "(Hardware Interrupt)"; break; 1308 case 0x600: ret = "(Alignment)"; break; 1309 case 0x700: ret = "(Program Check)"; break; 1310 case 0x800: ret = "(FPU Unavailable)"; break; 1311 case 0x900: ret = "(Decrementer)"; break; 1312 case 0x980: ret = "(Hypervisor Decrementer)"; break; 1313 case 0xa00: ret = "(Doorbell)"; break; 1314 case 0xc00: ret = "(System Call)"; break; 1315 case 0xd00: ret = "(Single Step)"; break; 1316 case 0xe40: ret = "(Emulation Assist)"; break; 1317 case 0xe60: ret = "(HMI)"; break; 1318 case 0xe80: ret = "(Hypervisor Doorbell)"; break; 1319 case 0xf00: ret = "(Performance Monitor)"; break; 1320 case 0xf20: ret = "(Altivec Unavailable)"; break; 1321 case 0x1300: ret = "(Instruction Breakpoint)"; break; 1322 case 0x1500: ret = "(Denormalisation)"; break; 1323 case 0x1700: ret = "(Altivec Assist)"; break; 1324 default: ret = ""; 1325 } 1326 return ret; 1327} 1328 1329static void get_function_bounds(unsigned long pc, unsigned long *startp, 1330 unsigned long *endp) 1331{ 1332 unsigned long size, offset; 1333 const char *name; 1334 1335 *startp = *endp = 0; 1336 if (pc == 0) 1337 return; 1338 if (setjmp(bus_error_jmp) == 0) { 1339 catch_memory_errors = 1; 1340 sync(); 1341 name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr); 1342 if (name != NULL) { 1343 *startp = pc - offset; 1344 *endp = pc - offset + size; 1345 } 1346 sync(); 1347 } 1348 catch_memory_errors = 0; 1349} 1350 1351#define LRSAVE_OFFSET (STACK_FRAME_LR_SAVE * sizeof(unsigned long)) 1352#define MARKER_OFFSET (STACK_FRAME_MARKER * sizeof(unsigned long)) 1353 1354static void xmon_show_stack(unsigned long sp, unsigned long lr, 1355 unsigned long pc) 1356{ 1357 int max_to_print = 64; 1358 unsigned long ip; 1359 unsigned long newsp; 1360 unsigned long marker; 1361 struct pt_regs regs; 1362 1363 while (max_to_print--) { 1364 if (sp < PAGE_OFFSET) { 1365 if (sp != 0) 1366 printf("SP (%lx) is in userspace\n", sp); 1367 break; 1368 } 1369 1370 if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long)) 1371 || !mread(sp, &newsp, sizeof(unsigned long))) { 1372 printf("Couldn't read stack frame at %lx\n", sp); 1373 break; 1374 } 1375 1376 /* 1377 * For the first stack frame, try to work out if 1378 * LR and/or the saved LR value in the bottommost 1379 * stack frame are valid. 1380 */ 1381 if ((pc | lr) != 0) { 1382 unsigned long fnstart, fnend; 1383 unsigned long nextip; 1384 int printip = 1; 1385 1386 get_function_bounds(pc, &fnstart, &fnend); 1387 nextip = 0; 1388 if (newsp > sp) 1389 mread(newsp + LRSAVE_OFFSET, &nextip, 1390 sizeof(unsigned long)); 1391 if (lr == ip) { 1392 if (lr < PAGE_OFFSET 1393 || (fnstart <= lr && lr < fnend)) 1394 printip = 0; 1395 } else if (lr == nextip) { 1396 printip = 0; 1397 } else if (lr >= PAGE_OFFSET 1398 && !(fnstart <= lr && lr < fnend)) { 1399 printf("[link register ] "); 1400 xmon_print_symbol(lr, " ", "\n"); 1401 } 1402 if (printip) { 1403 printf("["REG"] ", sp); 1404 xmon_print_symbol(ip, " ", " (unreliable)\n"); 1405 } 1406 pc = lr = 0; 1407 1408 } else { 1409 printf("["REG"] ", sp); 1410 xmon_print_symbol(ip, " ", "\n"); 1411 } 1412 1413 /* Look for "regshere" marker to see if this is 1414 an exception frame. */ 1415 if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long)) 1416 && marker == STACK_FRAME_REGS_MARKER) { 1417 if (mread(sp + STACK_FRAME_OVERHEAD, ®s, sizeof(regs)) 1418 != sizeof(regs)) { 1419 printf("Couldn't read registers at %lx\n", 1420 sp + STACK_FRAME_OVERHEAD); 1421 break; 1422 } 1423 printf("--- Exception: %lx %s at ", regs.trap, 1424 getvecname(TRAP(®s))); 1425 pc = regs.nip; 1426 lr = regs.link; 1427 xmon_print_symbol(pc, " ", "\n"); 1428 } 1429 1430 if (newsp == 0) 1431 break; 1432 1433 sp = newsp; 1434 } 1435} 1436 1437static void backtrace(struct pt_regs *excp) 1438{ 1439 unsigned long sp; 1440 1441 if (scanhex(&sp)) 1442 xmon_show_stack(sp, 0, 0); 1443 else 1444 xmon_show_stack(excp->gpr[1], excp->link, excp->nip); 1445 scannl(); 1446} 1447 1448static void print_bug_trap(struct pt_regs *regs) 1449{ 1450#ifdef CONFIG_BUG 1451 const struct bug_entry *bug; 1452 unsigned long addr; 1453 1454 if (regs->msr & MSR_PR) 1455 return; /* not in kernel */ 1456 addr = regs->nip; /* address of trap instruction */ 1457 if (addr < PAGE_OFFSET) 1458 return; 1459 bug = find_bug(regs->nip); 1460 if (bug == NULL) 1461 return; 1462 if (is_warning_bug(bug)) 1463 return; 1464 1465#ifdef CONFIG_DEBUG_BUGVERBOSE 1466 printf("kernel BUG at %s:%u!\n", 1467 bug->file, bug->line); 1468#else 1469 printf("kernel BUG at %p!\n", (void *)bug->bug_addr); 1470#endif 1471#endif /* CONFIG_BUG */ 1472} 1473 1474static void excprint(struct pt_regs *fp) 1475{ 1476 unsigned long trap; 1477 1478#ifdef CONFIG_SMP 1479 printf("cpu 0x%x: ", smp_processor_id()); 1480#endif /* CONFIG_SMP */ 1481 1482 trap = TRAP(fp); 1483 printf("Vector: %lx %s at [%lx]\n", fp->trap, getvecname(trap), fp); 1484 printf(" pc: "); 1485 xmon_print_symbol(fp->nip, ": ", "\n"); 1486 1487 printf(" lr: ", fp->link); 1488 xmon_print_symbol(fp->link, ": ", "\n"); 1489 1490 printf(" sp: %lx\n", fp->gpr[1]); 1491 printf(" msr: %lx\n", fp->msr); 1492 1493 if (trap == 0x300 || trap == 0x380 || trap == 0x600 || trap == 0x200) { 1494 printf(" dar: %lx\n", fp->dar); 1495 if (trap != 0x380) 1496 printf(" dsisr: %lx\n", fp->dsisr); 1497 } 1498 1499 printf(" current = 0x%lx\n", current); 1500#ifdef CONFIG_PPC64 1501 printf(" paca = 0x%lx\t softe: %d\t irq_happened: 0x%02x\n", 1502 local_paca, local_paca->soft_enabled, local_paca->irq_happened); 1503#endif 1504 if (current) { 1505 printf(" pid = %ld, comm = %s\n", 1506 current->pid, current->comm); 1507 } 1508 1509 if (trap == 0x700) 1510 print_bug_trap(fp); 1511} 1512 1513static void prregs(struct pt_regs *fp) 1514{ 1515 int n, trap; 1516 unsigned long base; 1517 struct pt_regs regs; 1518 1519 if (scanhex(&base)) { 1520 if (setjmp(bus_error_jmp) == 0) { 1521 catch_memory_errors = 1; 1522 sync(); 1523 regs = *(struct pt_regs *)base; 1524 sync(); 1525 __delay(200); 1526 } else { 1527 catch_memory_errors = 0; 1528 printf("*** Error reading registers from "REG"\n", 1529 base); 1530 return; 1531 } 1532 catch_memory_errors = 0; 1533 fp = ®s; 1534 } 1535 1536#ifdef CONFIG_PPC64 1537 if (FULL_REGS(fp)) { 1538 for (n = 0; n < 16; ++n) 1539 printf("R%.2ld = "REG" R%.2ld = "REG"\n", 1540 n, fp->gpr[n], n+16, fp->gpr[n+16]); 1541 } else { 1542 for (n = 0; n < 7; ++n) 1543 printf("R%.2ld = "REG" R%.2ld = "REG"\n", 1544 n, fp->gpr[n], n+7, fp->gpr[n+7]); 1545 } 1546#else 1547 for (n = 0; n < 32; ++n) { 1548 printf("R%.2d = %.8x%s", n, fp->gpr[n], 1549 (n & 3) == 3? "\n": " "); 1550 if (n == 12 && !FULL_REGS(fp)) { 1551 printf("\n"); 1552 break; 1553 } 1554 } 1555#endif 1556 printf("pc = "); 1557 xmon_print_symbol(fp->nip, " ", "\n"); 1558 if (TRAP(fp) != 0xc00 && cpu_has_feature(CPU_FTR_CFAR)) { 1559 printf("cfar= "); 1560 xmon_print_symbol(fp->orig_gpr3, " ", "\n"); 1561 } 1562 printf("lr = "); 1563 xmon_print_symbol(fp->link, " ", "\n"); 1564 printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr); 1565 printf("ctr = "REG" xer = "REG" trap = %4lx\n", 1566 fp->ctr, fp->xer, fp->trap); 1567 trap = TRAP(fp); 1568 if (trap == 0x300 || trap == 0x380 || trap == 0x600) 1569 printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr); 1570} 1571 1572static void cacheflush(void) 1573{ 1574 int cmd; 1575 unsigned long nflush; 1576 1577 cmd = inchar(); 1578 if (cmd != 'i') 1579 termch = cmd; 1580 scanhex((void *)&adrs); 1581 if (termch != '\n') 1582 termch = 0; 1583 nflush = 1; 1584 scanhex(&nflush); 1585 nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES; 1586 if (setjmp(bus_error_jmp) == 0) { 1587 catch_memory_errors = 1; 1588 sync(); 1589 1590 if (cmd != 'i') { 1591 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) 1592 cflush((void *) adrs); 1593 } else { 1594 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) 1595 cinval((void *) adrs); 1596 } 1597 sync(); 1598 /* wait a little while to see if we get a machine check */ 1599 __delay(200); 1600 } 1601 catch_memory_errors = 0; 1602} 1603 1604static unsigned long 1605read_spr(int n) 1606{ 1607 unsigned int instrs[2]; 1608 unsigned long (*code)(void); 1609 unsigned long ret = -1UL; 1610#ifdef CONFIG_PPC64 1611 unsigned long opd[3]; 1612 1613 opd[0] = (unsigned long)instrs; 1614 opd[1] = 0; 1615 opd[2] = 0; 1616 code = (unsigned long (*)(void)) opd; 1617#else 1618 code = (unsigned long (*)(void)) instrs; 1619#endif 1620 1621 /* mfspr r3,n; blr */ 1622 instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6); 1623 instrs[1] = 0x4e800020; 1624 store_inst(instrs); 1625 store_inst(instrs+1); 1626 1627 if (setjmp(bus_error_jmp) == 0) { 1628 catch_memory_errors = 1; 1629 sync(); 1630 1631 ret = code(); 1632 1633 sync(); 1634 /* wait a little while to see if we get a machine check */ 1635 __delay(200); 1636 n = size; 1637 } 1638 1639 return ret; 1640} 1641 1642static void 1643write_spr(int n, unsigned long val) 1644{ 1645 unsigned int instrs[2]; 1646 unsigned long (*code)(unsigned long); 1647#ifdef CONFIG_PPC64 1648 unsigned long opd[3]; 1649 1650 opd[0] = (unsigned long)instrs; 1651 opd[1] = 0; 1652 opd[2] = 0; 1653 code = (unsigned long (*)(unsigned long)) opd; 1654#else 1655 code = (unsigned long (*)(unsigned long)) instrs; 1656#endif 1657 1658 instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6); 1659 instrs[1] = 0x4e800020; 1660 store_inst(instrs); 1661 store_inst(instrs+1); 1662 1663 if (setjmp(bus_error_jmp) == 0) { 1664 catch_memory_errors = 1; 1665 sync(); 1666 1667 code(val); 1668 1669 sync(); 1670 /* wait a little while to see if we get a machine check */ 1671 __delay(200); 1672 n = size; 1673 } 1674} 1675 1676static unsigned long regno; 1677extern char exc_prolog; 1678extern char dec_exc; 1679 1680static void super_regs(void) 1681{ 1682 int cmd; 1683 unsigned long val; 1684 1685 cmd = skipbl(); 1686 if (cmd == '\n') { 1687 unsigned long sp, toc; 1688 asm("mr %0,1" : "=r" (sp) :); 1689 asm("mr %0,2" : "=r" (toc) :); 1690 1691 printf("msr = "REG" sprg0= "REG"\n", 1692 mfmsr(), mfspr(SPRN_SPRG0)); 1693 printf("pvr = "REG" sprg1= "REG"\n", 1694 mfspr(SPRN_PVR), mfspr(SPRN_SPRG1)); 1695 printf("dec = "REG" sprg2= "REG"\n", 1696 mfspr(SPRN_DEC), mfspr(SPRN_SPRG2)); 1697 printf("sp = "REG" sprg3= "REG"\n", sp, mfspr(SPRN_SPRG3)); 1698 printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR)); 1699 1700 return; 1701 } 1702 1703 scanhex(®no); 1704 switch (cmd) { 1705 case 'w': 1706 val = read_spr(regno); 1707 scanhex(&val); 1708 write_spr(regno, val); 1709 /* fall through */ 1710 case 'r': 1711 printf("spr %lx = %lx\n", regno, read_spr(regno)); 1712 break; 1713 } 1714 scannl(); 1715} 1716 1717/* 1718 * Stuff for reading and writing memory safely 1719 */ 1720static int 1721mread(unsigned long adrs, void *buf, int size) 1722{ 1723 volatile int n; 1724 char *p, *q; 1725 1726 n = 0; 1727 if (setjmp(bus_error_jmp) == 0) { 1728 catch_memory_errors = 1; 1729 sync(); 1730 p = (char *)adrs; 1731 q = (char *)buf; 1732 switch (size) { 1733 case 2: 1734 *(u16 *)q = *(u16 *)p; 1735 break; 1736 case 4: 1737 *(u32 *)q = *(u32 *)p; 1738 break; 1739 case 8: 1740 *(u64 *)q = *(u64 *)p; 1741 break; 1742 default: 1743 for( ; n < size; ++n) { 1744 *q++ = *p++; 1745 sync(); 1746 } 1747 } 1748 sync(); 1749 /* wait a little while to see if we get a machine check */ 1750 __delay(200); 1751 n = size; 1752 } 1753 catch_memory_errors = 0; 1754 return n; 1755} 1756 1757static int 1758mwrite(unsigned long adrs, void *buf, int size) 1759{ 1760 volatile int n; 1761 char *p, *q; 1762 1763 n = 0; 1764 if (setjmp(bus_error_jmp) == 0) { 1765 catch_memory_errors = 1; 1766 sync(); 1767 p = (char *) adrs; 1768 q = (char *) buf; 1769 switch (size) { 1770 case 2: 1771 *(u16 *)p = *(u16 *)q; 1772 break; 1773 case 4: 1774 *(u32 *)p = *(u32 *)q; 1775 break; 1776 case 8: 1777 *(u64 *)p = *(u64 *)q; 1778 break; 1779 default: 1780 for ( ; n < size; ++n) { 1781 *p++ = *q++; 1782 sync(); 1783 } 1784 } 1785 sync(); 1786 /* wait a little while to see if we get a machine check */ 1787 __delay(200); 1788 n = size; 1789 } else { 1790 printf("*** Error writing address "REG"\n", adrs + n); 1791 } 1792 catch_memory_errors = 0; 1793 return n; 1794} 1795 1796static int fault_type; 1797static int fault_except; 1798static char *fault_chars[] = { "--", "**", "##" }; 1799 1800static int handle_fault(struct pt_regs *regs) 1801{ 1802 fault_except = TRAP(regs); 1803 switch (TRAP(regs)) { 1804 case 0x200: 1805 fault_type = 0; 1806 break; 1807 case 0x300: 1808 case 0x380: 1809 fault_type = 1; 1810 break; 1811 default: 1812 fault_type = 2; 1813 } 1814 1815 longjmp(bus_error_jmp, 1); 1816 1817 return 0; 1818} 1819 1820#define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t)) 1821 1822static void 1823byterev(unsigned char *val, int size) 1824{ 1825 int t; 1826 1827 switch (size) { 1828 case 2: 1829 SWAP(val[0], val[1], t); 1830 break; 1831 case 4: 1832 SWAP(val[0], val[3], t); 1833 SWAP(val[1], val[2], t); 1834 break; 1835 case 8: /* is there really any use for this? */ 1836 SWAP(val[0], val[7], t); 1837 SWAP(val[1], val[6], t); 1838 SWAP(val[2], val[5], t); 1839 SWAP(val[3], val[4], t); 1840 break; 1841 } 1842} 1843 1844static int brev; 1845static int mnoread; 1846 1847static char *memex_help_string = 1848 "Memory examine command usage:\n" 1849 "m [addr] [flags] examine/change memory\n" 1850 " addr is optional. will start where left off.\n" 1851 " flags may include chars from this set:\n" 1852 " b modify by bytes (default)\n" 1853 " w modify by words (2 byte)\n" 1854 " l modify by longs (4 byte)\n" 1855 " d modify by doubleword (8 byte)\n" 1856 " r toggle reverse byte order mode\n" 1857 " n do not read memory (for i/o spaces)\n" 1858 " . ok to read (default)\n" 1859 "NOTE: flags are saved as defaults\n" 1860 ""; 1861 1862static char *memex_subcmd_help_string = 1863 "Memory examine subcommands:\n" 1864 " hexval write this val to current location\n" 1865 " 'string' write chars from string to this location\n" 1866 " ' increment address\n" 1867 " ^ decrement address\n" 1868 " / increment addr by 0x10. //=0x100, ///=0x1000, etc\n" 1869 " \\ decrement addr by 0x10. \\\\=0x100, \\\\\\=0x1000, etc\n" 1870 " ` clear no-read flag\n" 1871 " ; stay at this addr\n" 1872 " v change to byte mode\n" 1873 " w change to word (2 byte) mode\n" 1874 " l change to long (4 byte) mode\n" 1875 " u change to doubleword (8 byte) mode\n" 1876 " m addr change current addr\n" 1877 " n toggle no-read flag\n" 1878 " r toggle byte reverse flag\n" 1879 " < count back up count bytes\n" 1880 " > count skip forward count bytes\n" 1881 " x exit this mode\n" 1882 ""; 1883 1884static void 1885memex(void) 1886{ 1887 int cmd, inc, i, nslash; 1888 unsigned long n; 1889 unsigned char val[16]; 1890 1891 scanhex((void *)&adrs); 1892 cmd = skipbl(); 1893 if (cmd == '?') { 1894 printf(memex_help_string); 1895 return; 1896 } else { 1897 termch = cmd; 1898 } 1899 last_cmd = "m\n"; 1900 while ((cmd = skipbl()) != '\n') { 1901 switch( cmd ){ 1902 case 'b': size = 1; break; 1903 case 'w': size = 2; break; 1904 case 'l': size = 4; break; 1905 case 'd': size = 8; break; 1906 case 'r': brev = !brev; break; 1907 case 'n': mnoread = 1; break; 1908 case '.': mnoread = 0; break; 1909 } 1910 } 1911 if( size <= 0 ) 1912 size = 1; 1913 else if( size > 8 ) 1914 size = 8; 1915 for(;;){ 1916 if (!mnoread) 1917 n = mread(adrs, val, size); 1918 printf(REG"%c", adrs, brev? 'r': ' '); 1919 if (!mnoread) { 1920 if (brev) 1921 byterev(val, size); 1922 putchar(' '); 1923 for (i = 0; i < n; ++i) 1924 printf("%.2x", val[i]); 1925 for (; i < size; ++i) 1926 printf("%s", fault_chars[fault_type]); 1927 } 1928 putchar(' '); 1929 inc = size; 1930 nslash = 0; 1931 for(;;){ 1932 if( scanhex(&n) ){ 1933 for (i = 0; i < size; ++i) 1934 val[i] = n >> (i * 8); 1935 if (!brev) 1936 byterev(val, size); 1937 mwrite(adrs, val, size); 1938 inc = size; 1939 } 1940 cmd = skipbl(); 1941 if (cmd == '\n') 1942 break; 1943 inc = 0; 1944 switch (cmd) { 1945 case '\'': 1946 for(;;){ 1947 n = inchar(); 1948 if( n == '\\' ) 1949 n = bsesc(); 1950 else if( n == '\'' ) 1951 break; 1952 for (i = 0; i < size; ++i) 1953 val[i] = n >> (i * 8); 1954 if (!brev) 1955 byterev(val, size); 1956 mwrite(adrs, val, size); 1957 adrs += size; 1958 } 1959 adrs -= size; 1960 inc = size; 1961 break; 1962 case ',': 1963 adrs += size; 1964 break; 1965 case '.': 1966 mnoread = 0; 1967 break; 1968 case ';': 1969 break; 1970 case 'x': 1971 case EOF: 1972 scannl(); 1973 return; 1974 case 'b': 1975 case 'v': 1976 size = 1; 1977 break; 1978 case 'w': 1979 size = 2; 1980 break; 1981 case 'l': 1982 size = 4; 1983 break; 1984 case 'u': 1985 size = 8; 1986 break; 1987 case '^': 1988 adrs -= size; 1989 break; 1990 break; 1991 case '/': 1992 if (nslash > 0) 1993 adrs -= 1 << nslash; 1994 else 1995 nslash = 0; 1996 nslash += 4; 1997 adrs += 1 << nslash; 1998 break; 1999 case '\\': 2000 if (nslash < 0) 2001 adrs += 1 << -nslash; 2002 else 2003 nslash = 0; 2004 nslash -= 4; 2005 adrs -= 1 << -nslash; 2006 break; 2007 case 'm': 2008 scanhex((void *)&adrs); 2009 break; 2010 case 'n': 2011 mnoread = 1; 2012 break; 2013 case 'r': 2014 brev = !brev; 2015 break; 2016 case '<': 2017 n = size; 2018 scanhex(&n); 2019 adrs -= n; 2020 break; 2021 case '>': 2022 n = size; 2023 scanhex(&n); 2024 adrs += n; 2025 break; 2026 case '?': 2027 printf(memex_subcmd_help_string); 2028 break; 2029 } 2030 } 2031 adrs += inc; 2032 } 2033} 2034 2035static int 2036bsesc(void) 2037{ 2038 int c; 2039 2040 c = inchar(); 2041 switch( c ){ 2042 case 'n': c = '\n'; break; 2043 case 'r': c = '\r'; break; 2044 case 'b': c = '\b'; break; 2045 case 't': c = '\t'; break; 2046 } 2047 return c; 2048} 2049 2050static void xmon_rawdump (unsigned long adrs, long ndump) 2051{ 2052 long n, m, r, nr; 2053 unsigned char temp[16]; 2054 2055 for (n = ndump; n > 0;) { 2056 r = n < 16? n: 16; 2057 nr = mread(adrs, temp, r); 2058 adrs += nr; 2059 for (m = 0; m < r; ++m) { 2060 if (m < nr) 2061 printf("%.2x", temp[m]); 2062 else 2063 printf("%s", fault_chars[fault_type]); 2064 } 2065 n -= r; 2066 if (nr < r) 2067 break; 2068 } 2069 printf("\n"); 2070} 2071 2072#ifdef CONFIG_PPC64 2073static void dump_one_paca(int cpu) 2074{ 2075 struct paca_struct *p; 2076 2077 if (setjmp(bus_error_jmp) != 0) { 2078 printf("*** Error dumping paca for cpu 0x%x!\n", cpu); 2079 return; 2080 } 2081 2082 catch_memory_errors = 1; 2083 sync(); 2084 2085 p = &paca[cpu]; 2086 2087 printf("paca for cpu 0x%x @ %p:\n", cpu, p); 2088 2089 printf(" %-*s = %s\n", 16, "possible", cpu_possible(cpu) ? "yes" : "no"); 2090 printf(" %-*s = %s\n", 16, "present", cpu_present(cpu) ? "yes" : "no"); 2091 printf(" %-*s = %s\n", 16, "online", cpu_online(cpu) ? "yes" : "no"); 2092 2093#define DUMP(paca, name, format) \ 2094 printf(" %-*s = %#-*"format"\t(0x%lx)\n", 16, #name, 18, paca->name, \ 2095 offsetof(struct paca_struct, name)); 2096 2097 DUMP(p, lock_token, "x"); 2098 DUMP(p, paca_index, "x"); 2099 DUMP(p, kernel_toc, "lx"); 2100 DUMP(p, kernelbase, "lx"); 2101 DUMP(p, kernel_msr, "lx"); 2102 DUMP(p, emergency_sp, "p"); 2103#ifdef CONFIG_PPC_BOOK3S_64 2104 DUMP(p, mc_emergency_sp, "p"); 2105 DUMP(p, in_mce, "x"); 2106#endif 2107 DUMP(p, data_offset, "lx"); 2108 DUMP(p, hw_cpu_id, "x"); 2109 DUMP(p, cpu_start, "x"); 2110 DUMP(p, kexec_state, "x"); 2111 DUMP(p, __current, "p"); 2112 DUMP(p, kstack, "lx"); 2113 DUMP(p, stab_rr, "lx"); 2114 DUMP(p, saved_r1, "lx"); 2115 DUMP(p, trap_save, "x"); 2116 DUMP(p, soft_enabled, "x"); 2117 DUMP(p, irq_happened, "x"); 2118 DUMP(p, io_sync, "x"); 2119 DUMP(p, irq_work_pending, "x"); 2120 DUMP(p, nap_state_lost, "x"); 2121 2122#undef DUMP 2123 2124 catch_memory_errors = 0; 2125 sync(); 2126} 2127 2128static void dump_all_pacas(void) 2129{ 2130 int cpu; 2131 2132 if (num_possible_cpus() == 0) { 2133 printf("No possible cpus, use 'dp #' to dump individual cpus\n"); 2134 return; 2135 } 2136 2137 for_each_possible_cpu(cpu) 2138 dump_one_paca(cpu); 2139} 2140 2141static void dump_pacas(void) 2142{ 2143 unsigned long num; 2144 int c; 2145 2146 c = inchar(); 2147 if (c == 'a') { 2148 dump_all_pacas(); 2149 return; 2150 } 2151 2152 termch = c; /* Put c back, it wasn't 'a' */ 2153 2154 if (scanhex(&num)) 2155 dump_one_paca(num); 2156 else 2157 dump_one_paca(xmon_owner); 2158} 2159#endif 2160 2161static void 2162dump(void) 2163{ 2164 int c; 2165 2166 c = inchar(); 2167 2168#ifdef CONFIG_PPC64 2169 if (c == 'p') { 2170 dump_pacas(); 2171 return; 2172 } 2173#endif 2174 2175 if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n') 2176 termch = c; 2177 scanhex((void *)&adrs); 2178 if (termch != '\n') 2179 termch = 0; 2180 if (c == 'i') { 2181 scanhex(&nidump); 2182 if (nidump == 0) 2183 nidump = 16; 2184 else if (nidump > MAX_DUMP) 2185 nidump = MAX_DUMP; 2186 adrs += ppc_inst_dump(adrs, nidump, 1); 2187 last_cmd = "di\n"; 2188 } else if (c == 'l') { 2189 dump_log_buf(); 2190 } else if (c == 'r') { 2191 scanhex(&ndump); 2192 if (ndump == 0) 2193 ndump = 64; 2194 xmon_rawdump(adrs, ndump); 2195 adrs += ndump; 2196 last_cmd = "dr\n"; 2197 } else { 2198 scanhex(&ndump); 2199 if (ndump == 0) 2200 ndump = 64; 2201 else if (ndump > MAX_DUMP) 2202 ndump = MAX_DUMP; 2203 prdump(adrs, ndump); 2204 adrs += ndump; 2205 last_cmd = "d\n"; 2206 } 2207} 2208 2209static void 2210prdump(unsigned long adrs, long ndump) 2211{ 2212 long n, m, c, r, nr; 2213 unsigned char temp[16]; 2214 2215 for (n = ndump; n > 0;) { 2216 printf(REG, adrs); 2217 putchar(' '); 2218 r = n < 16? n: 16; 2219 nr = mread(adrs, temp, r); 2220 adrs += nr; 2221 for (m = 0; m < r; ++m) { 2222 if ((m & (sizeof(long) - 1)) == 0 && m > 0) 2223 putchar(' '); 2224 if (m < nr) 2225 printf("%.2x", temp[m]); 2226 else 2227 printf("%s", fault_chars[fault_type]); 2228 } 2229 for (; m < 16; ++m) { 2230 if ((m & (sizeof(long) - 1)) == 0) 2231 putchar(' '); 2232 printf(" "); 2233 } 2234 printf(" |"); 2235 for (m = 0; m < r; ++m) { 2236 if (m < nr) { 2237 c = temp[m]; 2238 putchar(' ' <= c && c <= '~'? c: '.'); 2239 } else 2240 putchar(' '); 2241 } 2242 n -= r; 2243 for (; m < 16; ++m) 2244 putchar(' '); 2245 printf("|\n"); 2246 if (nr < r) 2247 break; 2248 } 2249} 2250 2251typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr); 2252 2253static int 2254generic_inst_dump(unsigned long adr, long count, int praddr, 2255 instruction_dump_func dump_func) 2256{ 2257 int nr, dotted; 2258 unsigned long first_adr; 2259 unsigned long inst, last_inst = 0; 2260 unsigned char val[4]; 2261 2262 dotted = 0; 2263 for (first_adr = adr; count > 0; --count, adr += 4) { 2264 nr = mread(adr, val, 4); 2265 if (nr == 0) { 2266 if (praddr) { 2267 const char *x = fault_chars[fault_type]; 2268 printf(REG" %s%s%s%s\n", adr, x, x, x, x); 2269 } 2270 break; 2271 } 2272 inst = GETWORD(val); 2273 if (adr > first_adr && inst == last_inst) { 2274 if (!dotted) { 2275 printf(" ...\n"); 2276 dotted = 1; 2277 } 2278 continue; 2279 } 2280 dotted = 0; 2281 last_inst = inst; 2282 if (praddr) 2283 printf(REG" %.8x", adr, inst); 2284 printf("\t"); 2285 dump_func(inst, adr); 2286 printf("\n"); 2287 } 2288 return adr - first_adr; 2289} 2290 2291static int 2292ppc_inst_dump(unsigned long adr, long count, int praddr) 2293{ 2294 return generic_inst_dump(adr, count, praddr, print_insn_powerpc); 2295} 2296 2297void 2298print_address(unsigned long addr) 2299{ 2300 xmon_print_symbol(addr, "\t# ", ""); 2301} 2302 2303void 2304dump_log_buf(void) 2305{ 2306 struct kmsg_dumper dumper = { .active = 1 }; 2307 unsigned char buf[128]; 2308 size_t len; 2309 2310 if (setjmp(bus_error_jmp) != 0) { 2311 printf("Error dumping printk buffer!\n"); 2312 return; 2313 } 2314 2315 catch_memory_errors = 1; 2316 sync(); 2317 2318 kmsg_dump_rewind_nolock(&dumper); 2319 while (kmsg_dump_get_line_nolock(&dumper, false, buf, sizeof(buf), &len)) { 2320 buf[len] = '\0'; 2321 printf("%s", buf); 2322 } 2323 2324 sync(); 2325 /* wait a little while to see if we get a machine check */ 2326 __delay(200); 2327 catch_memory_errors = 0; 2328} 2329 2330/* 2331 * Memory operations - move, set, print differences 2332 */ 2333static unsigned long mdest; /* destination address */ 2334static unsigned long msrc; /* source address */ 2335static unsigned long mval; /* byte value to set memory to */ 2336static unsigned long mcount; /* # bytes to affect */ 2337static unsigned long mdiffs; /* max # differences to print */ 2338 2339static void 2340memops(int cmd) 2341{ 2342 scanhex((void *)&mdest); 2343 if( termch != '\n' ) 2344 termch = 0; 2345 scanhex((void *)(cmd == 's'? &mval: &msrc)); 2346 if( termch != '\n' ) 2347 termch = 0; 2348 scanhex((void *)&mcount); 2349 switch( cmd ){ 2350 case 'm': 2351 memmove((void *)mdest, (void *)msrc, mcount); 2352 break; 2353 case 's': 2354 memset((void *)mdest, mval, mcount); 2355 break; 2356 case 'd': 2357 if( termch != '\n' ) 2358 termch = 0; 2359 scanhex((void *)&mdiffs); 2360 memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs); 2361 break; 2362 } 2363} 2364 2365static void 2366memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr) 2367{ 2368 unsigned n, prt; 2369 2370 prt = 0; 2371 for( n = nb; n > 0; --n ) 2372 if( *p1++ != *p2++ ) 2373 if( ++prt <= maxpr ) 2374 printf("%.16x %.2x # %.16x %.2x\n", p1 - 1, 2375 p1[-1], p2 - 1, p2[-1]); 2376 if( prt > maxpr ) 2377 printf("Total of %d differences\n", prt); 2378} 2379 2380static unsigned mend; 2381static unsigned mask; 2382 2383static void 2384memlocate(void) 2385{ 2386 unsigned a, n; 2387 unsigned char val[4]; 2388 2389 last_cmd = "ml"; 2390 scanhex((void *)&mdest); 2391 if (termch != '\n') { 2392 termch = 0; 2393 scanhex((void *)&mend); 2394 if (termch != '\n') { 2395 termch = 0; 2396 scanhex((void *)&mval); 2397 mask = ~0; 2398 if (termch != '\n') termch = 0; 2399 scanhex((void *)&mask); 2400 } 2401 } 2402 n = 0; 2403 for (a = mdest; a < mend; a += 4) { 2404 if (mread(a, val, 4) == 4 2405 && ((GETWORD(val) ^ mval) & mask) == 0) { 2406 printf("%.16x: %.16x\n", a, GETWORD(val)); 2407 if (++n >= 10) 2408 break; 2409 } 2410 } 2411} 2412 2413static unsigned long mskip = 0x1000; 2414static unsigned long mlim = 0xffffffff; 2415 2416static void 2417memzcan(void) 2418{ 2419 unsigned char v; 2420 unsigned a; 2421 int ok, ook; 2422 2423 scanhex(&mdest); 2424 if (termch != '\n') termch = 0; 2425 scanhex(&mskip); 2426 if (termch != '\n') termch = 0; 2427 scanhex(&mlim); 2428 ook = 0; 2429 for (a = mdest; a < mlim; a += mskip) { 2430 ok = mread(a, &v, 1); 2431 if (ok && !ook) { 2432 printf("%.8x .. ", a); 2433 } else if (!ok && ook) 2434 printf("%.8x\n", a - mskip); 2435 ook = ok; 2436 if (a + mskip < a) 2437 break; 2438 } 2439 if (ook) 2440 printf("%.8x\n", a - mskip); 2441} 2442 2443static void proccall(void) 2444{ 2445 unsigned long args[8]; 2446 unsigned long ret; 2447 int i; 2448 typedef unsigned long (*callfunc_t)(unsigned long, unsigned long, 2449 unsigned long, unsigned long, unsigned long, 2450 unsigned long, unsigned long, unsigned long); 2451 callfunc_t func; 2452 2453 if (!scanhex(&adrs)) 2454 return; 2455 if (termch != '\n') 2456 termch = 0; 2457 for (i = 0; i < 8; ++i) 2458 args[i] = 0; 2459 for (i = 0; i < 8; ++i) { 2460 if (!scanhex(&args[i]) || termch == '\n') 2461 break; 2462 termch = 0; 2463 } 2464 func = (callfunc_t) adrs; 2465 ret = 0; 2466 if (setjmp(bus_error_jmp) == 0) { 2467 catch_memory_errors = 1; 2468 sync(); 2469 ret = func(args[0], args[1], args[2], args[3], 2470 args[4], args[5], args[6], args[7]); 2471 sync(); 2472 printf("return value is 0x%lx\n", ret); 2473 } else { 2474 printf("*** %x exception occurred\n", fault_except); 2475 } 2476 catch_memory_errors = 0; 2477} 2478 2479/* Input scanning routines */ 2480int 2481skipbl(void) 2482{ 2483 int c; 2484 2485 if( termch != 0 ){ 2486 c = termch; 2487 termch = 0; 2488 } else 2489 c = inchar(); 2490 while( c == ' ' || c == '\t' ) 2491 c = inchar(); 2492 return c; 2493} 2494 2495#define N_PTREGS 44 2496static char *regnames[N_PTREGS] = { 2497 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", 2498 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", 2499 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", 2500 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", 2501 "pc", "msr", "or3", "ctr", "lr", "xer", "ccr", 2502#ifdef CONFIG_PPC64 2503 "softe", 2504#else 2505 "mq", 2506#endif 2507 "trap", "dar", "dsisr", "res" 2508}; 2509 2510int 2511scanhex(unsigned long *vp) 2512{ 2513 int c, d; 2514 unsigned long v; 2515 2516 c = skipbl(); 2517 if (c == '%') { 2518 /* parse register name */ 2519 char regname[8]; 2520 int i; 2521 2522 for (i = 0; i < sizeof(regname) - 1; ++i) { 2523 c = inchar(); 2524 if (!isalnum(c)) { 2525 termch = c; 2526 break; 2527 } 2528 regname[i] = c; 2529 } 2530 regname[i] = 0; 2531 for (i = 0; i < N_PTREGS; ++i) { 2532 if (strcmp(regnames[i], regname) == 0) { 2533 if (xmon_regs == NULL) { 2534 printf("regs not available\n"); 2535 return 0; 2536 } 2537 *vp = ((unsigned long *)xmon_regs)[i]; 2538 return 1; 2539 } 2540 } 2541 printf("invalid register name '%%%s'\n", regname); 2542 return 0; 2543 } 2544 2545 /* skip leading "0x" if any */ 2546 2547 if (c == '0') { 2548 c = inchar(); 2549 if (c == 'x') { 2550 c = inchar(); 2551 } else { 2552 d = hexdigit(c); 2553 if (d == EOF) { 2554 termch = c; 2555 *vp = 0; 2556 return 1; 2557 } 2558 } 2559 } else if (c == '$') { 2560 int i; 2561 for (i=0; i<63; i++) { 2562 c = inchar(); 2563 if (isspace(c) || c == '\0') { 2564 termch = c; 2565 break; 2566 } 2567 tmpstr[i] = c; 2568 } 2569 tmpstr[i++] = 0; 2570 *vp = 0; 2571 if (setjmp(bus_error_jmp) == 0) { 2572 catch_memory_errors = 1; 2573 sync(); 2574 *vp = kallsyms_lookup_name(tmpstr); 2575 sync(); 2576 } 2577 catch_memory_errors = 0; 2578 if (!(*vp)) { 2579 printf("unknown symbol '%s'\n", tmpstr); 2580 return 0; 2581 } 2582 return 1; 2583 } 2584 2585 d = hexdigit(c); 2586 if (d == EOF) { 2587 termch = c; 2588 return 0; 2589 } 2590 v = 0; 2591 do { 2592 v = (v << 4) + d; 2593 c = inchar(); 2594 d = hexdigit(c); 2595 } while (d != EOF); 2596 termch = c; 2597 *vp = v; 2598 return 1; 2599} 2600 2601static void 2602scannl(void) 2603{ 2604 int c; 2605 2606 c = termch; 2607 termch = 0; 2608 while( c != '\n' ) 2609 c = inchar(); 2610} 2611 2612static int hexdigit(int c) 2613{ 2614 if( '0' <= c && c <= '9' ) 2615 return c - '0'; 2616 if( 'A' <= c && c <= 'F' ) 2617 return c - ('A' - 10); 2618 if( 'a' <= c && c <= 'f' ) 2619 return c - ('a' - 10); 2620 return EOF; 2621} 2622 2623void 2624getstring(char *s, int size) 2625{ 2626 int c; 2627 2628 c = skipbl(); 2629 do { 2630 if( size > 1 ){ 2631 *s++ = c; 2632 --size; 2633 } 2634 c = inchar(); 2635 } while( c != ' ' && c != '\t' && c != '\n' ); 2636 termch = c; 2637 *s = 0; 2638} 2639 2640static char line[256]; 2641static char *lineptr; 2642 2643static void 2644flush_input(void) 2645{ 2646 lineptr = NULL; 2647} 2648 2649static int 2650inchar(void) 2651{ 2652 if (lineptr == NULL || *lineptr == 0) { 2653 if (xmon_gets(line, sizeof(line)) == NULL) { 2654 lineptr = NULL; 2655 return EOF; 2656 } 2657 lineptr = line; 2658 } 2659 return *lineptr++; 2660} 2661 2662static void 2663take_input(char *str) 2664{ 2665 lineptr = str; 2666} 2667 2668 2669static void 2670symbol_lookup(void) 2671{ 2672 int type = inchar(); 2673 unsigned long addr; 2674 static char tmp[64]; 2675 2676 switch (type) { 2677 case 'a': 2678 if (scanhex(&addr)) 2679 xmon_print_symbol(addr, ": ", "\n"); 2680 termch = 0; 2681 break; 2682 case 's': 2683 getstring(tmp, 64); 2684 if (setjmp(bus_error_jmp) == 0) { 2685 catch_memory_errors = 1; 2686 sync(); 2687 addr = kallsyms_lookup_name(tmp); 2688 if (addr) 2689 printf("%s: %lx\n", tmp, addr); 2690 else 2691 printf("Symbol '%s' not found.\n", tmp); 2692 sync(); 2693 } 2694 catch_memory_errors = 0; 2695 termch = 0; 2696 break; 2697 } 2698} 2699 2700 2701/* Print an address in numeric and symbolic form (if possible) */ 2702static void xmon_print_symbol(unsigned long address, const char *mid, 2703 const char *after) 2704{ 2705 char *modname; 2706 const char *name = NULL; 2707 unsigned long offset, size; 2708 2709 printf(REG, address); 2710 if (setjmp(bus_error_jmp) == 0) { 2711 catch_memory_errors = 1; 2712 sync(); 2713 name = kallsyms_lookup(address, &size, &offset, &modname, 2714 tmpstr); 2715 sync(); 2716 /* wait a little while to see if we get a machine check */ 2717 __delay(200); 2718 } 2719 2720 catch_memory_errors = 0; 2721 2722 if (name) { 2723 printf("%s%s+%#lx/%#lx", mid, name, offset, size); 2724 if (modname) 2725 printf(" [%s]", modname); 2726 } 2727 printf("%s", after); 2728} 2729 2730#ifdef CONFIG_PPC_BOOK3S_64 2731void dump_segments(void) 2732{ 2733 int i; 2734 unsigned long esid,vsid,valid; 2735 unsigned long llp; 2736 2737 printf("SLB contents of cpu 0x%x\n", smp_processor_id()); 2738 2739 for (i = 0; i < mmu_slb_size; i++) { 2740 asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i)); 2741 asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i)); 2742 valid = (esid & SLB_ESID_V); 2743 if (valid | esid | vsid) { 2744 printf("%02d %016lx %016lx", i, esid, vsid); 2745 if (valid) { 2746 llp = vsid & SLB_VSID_LLP; 2747 if (vsid & SLB_VSID_B_1T) { 2748 printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n", 2749 GET_ESID_1T(esid), 2750 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T, 2751 llp); 2752 } else { 2753 printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n", 2754 GET_ESID(esid), 2755 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT, 2756 llp); 2757 } 2758 } else 2759 printf("\n"); 2760 } 2761 } 2762} 2763#endif 2764 2765#ifdef CONFIG_PPC_STD_MMU_32 2766void dump_segments(void) 2767{ 2768 int i; 2769 2770 printf("sr0-15 ="); 2771 for (i = 0; i < 16; ++i) 2772 printf(" %x", mfsrin(i)); 2773 printf("\n"); 2774} 2775#endif 2776 2777#ifdef CONFIG_44x 2778static void dump_tlb_44x(void) 2779{ 2780 int i; 2781 2782 for (i = 0; i < PPC44x_TLB_SIZE; i++) { 2783 unsigned long w0,w1,w2; 2784 asm volatile("tlbre %0,%1,0" : "=r" (w0) : "r" (i)); 2785 asm volatile("tlbre %0,%1,1" : "=r" (w1) : "r" (i)); 2786 asm volatile("tlbre %0,%1,2" : "=r" (w2) : "r" (i)); 2787 printf("[%02x] %08x %08x %08x ", i, w0, w1, w2); 2788 if (w0 & PPC44x_TLB_VALID) { 2789 printf("V %08x -> %01x%08x %c%c%c%c%c", 2790 w0 & PPC44x_TLB_EPN_MASK, 2791 w1 & PPC44x_TLB_ERPN_MASK, 2792 w1 & PPC44x_TLB_RPN_MASK, 2793 (w2 & PPC44x_TLB_W) ? 'W' : 'w', 2794 (w2 & PPC44x_TLB_I) ? 'I' : 'i', 2795 (w2 & PPC44x_TLB_M) ? 'M' : 'm', 2796 (w2 & PPC44x_TLB_G) ? 'G' : 'g', 2797 (w2 & PPC44x_TLB_E) ? 'E' : 'e'); 2798 } 2799 printf("\n"); 2800 } 2801} 2802#endif /* CONFIG_44x */ 2803 2804#ifdef CONFIG_PPC_BOOK3E 2805static void dump_tlb_book3e(void) 2806{ 2807 u32 mmucfg, pidmask, lpidmask; 2808 u64 ramask; 2809 int i, tlb, ntlbs, pidsz, lpidsz, rasz, lrat = 0; 2810 int mmu_version; 2811 static const char *pgsz_names[] = { 2812 " 1K", 2813 " 2K", 2814 " 4K", 2815 " 8K", 2816 " 16K", 2817 " 32K", 2818 " 64K", 2819 "128K", 2820 "256K", 2821 "512K", 2822 " 1M", 2823 " 2M", 2824 " 4M", 2825 " 8M", 2826 " 16M", 2827 " 32M", 2828 " 64M", 2829 "128M", 2830 "256M", 2831 "512M", 2832 " 1G", 2833 " 2G", 2834 " 4G", 2835 " 8G", 2836 " 16G", 2837 " 32G", 2838 " 64G", 2839 "128G", 2840 "256G", 2841 "512G", 2842 " 1T", 2843 " 2T", 2844 }; 2845 2846 /* Gather some infos about the MMU */ 2847 mmucfg = mfspr(SPRN_MMUCFG); 2848 mmu_version = (mmucfg & 3) + 1; 2849 ntlbs = ((mmucfg >> 2) & 3) + 1; 2850 pidsz = ((mmucfg >> 6) & 0x1f) + 1; 2851 lpidsz = (mmucfg >> 24) & 0xf; 2852 rasz = (mmucfg >> 16) & 0x7f; 2853 if ((mmu_version > 1) && (mmucfg & 0x10000)) 2854 lrat = 1; 2855 printf("Book3E MMU MAV=%d.0,%d TLBs,%d-bit PID,%d-bit LPID,%d-bit RA\n", 2856 mmu_version, ntlbs, pidsz, lpidsz, rasz); 2857 pidmask = (1ul << pidsz) - 1; 2858 lpidmask = (1ul << lpidsz) - 1; 2859 ramask = (1ull << rasz) - 1; 2860 2861 for (tlb = 0; tlb < ntlbs; tlb++) { 2862 u32 tlbcfg; 2863 int nent, assoc, new_cc = 1; 2864 printf("TLB %d:\n------\n", tlb); 2865 switch(tlb) { 2866 case 0: 2867 tlbcfg = mfspr(SPRN_TLB0CFG); 2868 break; 2869 case 1: 2870 tlbcfg = mfspr(SPRN_TLB1CFG); 2871 break; 2872 case 2: 2873 tlbcfg = mfspr(SPRN_TLB2CFG); 2874 break; 2875 case 3: 2876 tlbcfg = mfspr(SPRN_TLB3CFG); 2877 break; 2878 default: 2879 printf("Unsupported TLB number !\n"); 2880 continue; 2881 } 2882 nent = tlbcfg & 0xfff; 2883 assoc = (tlbcfg >> 24) & 0xff; 2884 for (i = 0; i < nent; i++) { 2885 u32 mas0 = MAS0_TLBSEL(tlb); 2886 u32 mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K); 2887 u64 mas2 = 0; 2888 u64 mas7_mas3; 2889 int esel = i, cc = i; 2890 2891 if (assoc != 0) { 2892 cc = i / assoc; 2893 esel = i % assoc; 2894 mas2 = cc * 0x1000; 2895 } 2896 2897 mas0 |= MAS0_ESEL(esel); 2898 mtspr(SPRN_MAS0, mas0); 2899 mtspr(SPRN_MAS1, mas1); 2900 mtspr(SPRN_MAS2, mas2); 2901 asm volatile("tlbre 0,0,0" : : : "memory"); 2902 mas1 = mfspr(SPRN_MAS1); 2903 mas2 = mfspr(SPRN_MAS2); 2904 mas7_mas3 = mfspr(SPRN_MAS7_MAS3); 2905 if (assoc && (i % assoc) == 0) 2906 new_cc = 1; 2907 if (!(mas1 & MAS1_VALID)) 2908 continue; 2909 if (assoc == 0) 2910 printf("%04x- ", i); 2911 else if (new_cc) 2912 printf("%04x-%c", cc, 'A' + esel); 2913 else 2914 printf(" |%c", 'A' + esel); 2915 new_cc = 0; 2916 printf(" %016llx %04x %s %c%c AS%c", 2917 mas2 & ~0x3ffull, 2918 (mas1 >> 16) & 0x3fff, 2919 pgsz_names[(mas1 >> 7) & 0x1f], 2920 mas1 & MAS1_IND ? 'I' : ' ', 2921 mas1 & MAS1_IPROT ? 'P' : ' ', 2922 mas1 & MAS1_TS ? '1' : '0'); 2923 printf(" %c%c%c%c%c%c%c", 2924 mas2 & MAS2_X0 ? 'a' : ' ', 2925 mas2 & MAS2_X1 ? 'v' : ' ', 2926 mas2 & MAS2_W ? 'w' : ' ', 2927 mas2 & MAS2_I ? 'i' : ' ', 2928 mas2 & MAS2_M ? 'm' : ' ', 2929 mas2 & MAS2_G ? 'g' : ' ', 2930 mas2 & MAS2_E ? 'e' : ' '); 2931 printf(" %016llx", mas7_mas3 & ramask & ~0x7ffull); 2932 if (mas1 & MAS1_IND) 2933 printf(" %s\n", 2934 pgsz_names[(mas7_mas3 >> 1) & 0x1f]); 2935 else 2936 printf(" U%c%c%c S%c%c%c\n", 2937 mas7_mas3 & MAS3_UX ? 'x' : ' ', 2938 mas7_mas3 & MAS3_UW ? 'w' : ' ', 2939 mas7_mas3 & MAS3_UR ? 'r' : ' ', 2940 mas7_mas3 & MAS3_SX ? 'x' : ' ', 2941 mas7_mas3 & MAS3_SW ? 'w' : ' ', 2942 mas7_mas3 & MAS3_SR ? 'r' : ' '); 2943 } 2944 } 2945} 2946#endif /* CONFIG_PPC_BOOK3E */ 2947 2948static void xmon_init(int enable) 2949{ 2950 if (enable) { 2951 __debugger = xmon; 2952 __debugger_ipi = xmon_ipi; 2953 __debugger_bpt = xmon_bpt; 2954 __debugger_sstep = xmon_sstep; 2955 __debugger_iabr_match = xmon_iabr_match; 2956 __debugger_break_match = xmon_break_match; 2957 __debugger_fault_handler = xmon_fault_handler; 2958 } else { 2959 __debugger = NULL; 2960 __debugger_ipi = NULL; 2961 __debugger_bpt = NULL; 2962 __debugger_sstep = NULL; 2963 __debugger_iabr_match = NULL; 2964 __debugger_break_match = NULL; 2965 __debugger_fault_handler = NULL; 2966 } 2967} 2968 2969#ifdef CONFIG_MAGIC_SYSRQ 2970static void sysrq_handle_xmon(int key) 2971{ 2972 /* ensure xmon is enabled */ 2973 xmon_init(1); 2974 debugger(get_irq_regs()); 2975} 2976 2977static struct sysrq_key_op sysrq_xmon_op = { 2978 .handler = sysrq_handle_xmon, 2979 .help_msg = "xmon(x)", 2980 .action_msg = "Entering xmon", 2981}; 2982 2983static int __init setup_xmon_sysrq(void) 2984{ 2985 register_sysrq_key('x', &sysrq_xmon_op); 2986 return 0; 2987} 2988__initcall(setup_xmon_sysrq); 2989#endif /* CONFIG_MAGIC_SYSRQ */ 2990 2991static int __initdata xmon_early, xmon_off; 2992 2993static int __init early_parse_xmon(char *p) 2994{ 2995 if (!p || strncmp(p, "early", 5) == 0) { 2996 /* just "xmon" is equivalent to "xmon=early" */ 2997 xmon_init(1); 2998 xmon_early = 1; 2999 } else if (strncmp(p, "on", 2) == 0) 3000 xmon_init(1); 3001 else if (strncmp(p, "off", 3) == 0) 3002 xmon_off = 1; 3003 else if (strncmp(p, "nobt", 4) == 0) 3004 xmon_no_auto_backtrace = 1; 3005 else 3006 return 1; 3007 3008 return 0; 3009} 3010early_param("xmon", early_parse_xmon); 3011 3012void __init xmon_setup(void) 3013{ 3014#ifdef CONFIG_XMON_DEFAULT 3015 if (!xmon_off) 3016 xmon_init(1); 3017#endif 3018 if (xmon_early) 3019 debugger(NULL); 3020} 3021 3022#ifdef CONFIG_SPU_BASE 3023 3024struct spu_info { 3025 struct spu *spu; 3026 u64 saved_mfc_sr1_RW; 3027 u32 saved_spu_runcntl_RW; 3028 unsigned long dump_addr; 3029 u8 stopped_ok; 3030}; 3031 3032#define XMON_NUM_SPUS 16 /* Enough for current hardware */ 3033 3034static struct spu_info spu_info[XMON_NUM_SPUS]; 3035 3036void xmon_register_spus(struct list_head *list) 3037{ 3038 struct spu *spu; 3039 3040 list_for_each_entry(spu, list, full_list) { 3041 if (spu->number >= XMON_NUM_SPUS) { 3042 WARN_ON(1); 3043 continue; 3044 } 3045 3046 spu_info[spu->number].spu = spu; 3047 spu_info[spu->number].stopped_ok = 0; 3048 spu_info[spu->number].dump_addr = (unsigned long) 3049 spu_info[spu->number].spu->local_store; 3050 } 3051} 3052 3053static void stop_spus(void) 3054{ 3055 struct spu *spu; 3056 int i; 3057 u64 tmp; 3058 3059 for (i = 0; i < XMON_NUM_SPUS; i++) { 3060 if (!spu_info[i].spu) 3061 continue; 3062 3063 if (setjmp(bus_error_jmp) == 0) { 3064 catch_memory_errors = 1; 3065 sync(); 3066 3067 spu = spu_info[i].spu; 3068 3069 spu_info[i].saved_spu_runcntl_RW = 3070 in_be32(&spu->problem->spu_runcntl_RW); 3071 3072 tmp = spu_mfc_sr1_get(spu); 3073 spu_info[i].saved_mfc_sr1_RW = tmp; 3074 3075 tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK; 3076 spu_mfc_sr1_set(spu, tmp); 3077 3078 sync(); 3079 __delay(200); 3080 3081 spu_info[i].stopped_ok = 1; 3082 3083 printf("Stopped spu %.2d (was %s)\n", i, 3084 spu_info[i].saved_spu_runcntl_RW ? 3085 "running" : "stopped"); 3086 } else { 3087 catch_memory_errors = 0; 3088 printf("*** Error stopping spu %.2d\n", i); 3089 } 3090 catch_memory_errors = 0; 3091 } 3092} 3093 3094static void restart_spus(void) 3095{ 3096 struct spu *spu; 3097 int i; 3098 3099 for (i = 0; i < XMON_NUM_SPUS; i++) { 3100 if (!spu_info[i].spu) 3101 continue; 3102 3103 if (!spu_info[i].stopped_ok) { 3104 printf("*** Error, spu %d was not successfully stopped" 3105 ", not restarting\n", i); 3106 continue; 3107 } 3108 3109 if (setjmp(bus_error_jmp) == 0) { 3110 catch_memory_errors = 1; 3111 sync(); 3112 3113 spu = spu_info[i].spu; 3114 spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW); 3115 out_be32(&spu->problem->spu_runcntl_RW, 3116 spu_info[i].saved_spu_runcntl_RW); 3117 3118 sync(); 3119 __delay(200); 3120 3121 printf("Restarted spu %.2d\n", i); 3122 } else { 3123 catch_memory_errors = 0; 3124 printf("*** Error restarting spu %.2d\n", i); 3125 } 3126 catch_memory_errors = 0; 3127 } 3128} 3129 3130#define DUMP_WIDTH 23 3131#define DUMP_VALUE(format, field, value) \ 3132do { \ 3133 if (setjmp(bus_error_jmp) == 0) { \ 3134 catch_memory_errors = 1; \ 3135 sync(); \ 3136 printf(" %-*s = "format"\n", DUMP_WIDTH, \ 3137 #field, value); \ 3138 sync(); \ 3139 __delay(200); \ 3140 } else { \ 3141 catch_memory_errors = 0; \ 3142 printf(" %-*s = *** Error reading field.\n", \ 3143 DUMP_WIDTH, #field); \ 3144 } \ 3145 catch_memory_errors = 0; \ 3146} while (0) 3147 3148#define DUMP_FIELD(obj, format, field) \ 3149 DUMP_VALUE(format, field, obj->field) 3150 3151static void dump_spu_fields(struct spu *spu) 3152{ 3153 printf("Dumping spu fields at address %p:\n", spu); 3154 3155 DUMP_FIELD(spu, "0x%x", number); 3156 DUMP_FIELD(spu, "%s", name); 3157 DUMP_FIELD(spu, "0x%lx", local_store_phys); 3158 DUMP_FIELD(spu, "0x%p", local_store); 3159 DUMP_FIELD(spu, "0x%lx", ls_size); 3160 DUMP_FIELD(spu, "0x%x", node); 3161 DUMP_FIELD(spu, "0x%lx", flags); 3162 DUMP_FIELD(spu, "%d", class_0_pending); 3163 DUMP_FIELD(spu, "0x%lx", class_0_dar); 3164 DUMP_FIELD(spu, "0x%lx", class_1_dar); 3165 DUMP_FIELD(spu, "0x%lx", class_1_dsisr); 3166 DUMP_FIELD(spu, "0x%lx", irqs[0]); 3167 DUMP_FIELD(spu, "0x%lx", irqs[1]); 3168 DUMP_FIELD(spu, "0x%lx", irqs[2]); 3169 DUMP_FIELD(spu, "0x%x", slb_replace); 3170 DUMP_FIELD(spu, "%d", pid); 3171 DUMP_FIELD(spu, "0x%p", mm); 3172 DUMP_FIELD(spu, "0x%p", ctx); 3173 DUMP_FIELD(spu, "0x%p", rq); 3174 DUMP_FIELD(spu, "0x%p", timestamp); 3175 DUMP_FIELD(spu, "0x%lx", problem_phys); 3176 DUMP_FIELD(spu, "0x%p", problem); 3177 DUMP_VALUE("0x%x", problem->spu_runcntl_RW, 3178 in_be32(&spu->problem->spu_runcntl_RW)); 3179 DUMP_VALUE("0x%x", problem->spu_status_R, 3180 in_be32(&spu->problem->spu_status_R)); 3181 DUMP_VALUE("0x%x", problem->spu_npc_RW, 3182 in_be32(&spu->problem->spu_npc_RW)); 3183 DUMP_FIELD(spu, "0x%p", priv2); 3184 DUMP_FIELD(spu, "0x%p", pdata); 3185} 3186 3187int 3188spu_inst_dump(unsigned long adr, long count, int praddr) 3189{ 3190 return generic_inst_dump(adr, count, praddr, print_insn_spu); 3191} 3192 3193static void dump_spu_ls(unsigned long num, int subcmd) 3194{ 3195 unsigned long offset, addr, ls_addr; 3196 3197 if (setjmp(bus_error_jmp) == 0) { 3198 catch_memory_errors = 1; 3199 sync(); 3200 ls_addr = (unsigned long)spu_info[num].spu->local_store; 3201 sync(); 3202 __delay(200); 3203 } else { 3204 catch_memory_errors = 0; 3205 printf("*** Error: accessing spu info for spu %d\n", num); 3206 return; 3207 } 3208 catch_memory_errors = 0; 3209 3210 if (scanhex(&offset)) 3211 addr = ls_addr + offset; 3212 else 3213 addr = spu_info[num].dump_addr; 3214 3215 if (addr >= ls_addr + LS_SIZE) { 3216 printf("*** Error: address outside of local store\n"); 3217 return; 3218 } 3219 3220 switch (subcmd) { 3221 case 'i': 3222 addr += spu_inst_dump(addr, 16, 1); 3223 last_cmd = "sdi\n"; 3224 break; 3225 default: 3226 prdump(addr, 64); 3227 addr += 64; 3228 last_cmd = "sd\n"; 3229 break; 3230 } 3231 3232 spu_info[num].dump_addr = addr; 3233} 3234 3235static int do_spu_cmd(void) 3236{ 3237 static unsigned long num = 0; 3238 int cmd, subcmd = 0; 3239 3240 cmd = inchar(); 3241 switch (cmd) { 3242 case 's': 3243 stop_spus(); 3244 break; 3245 case 'r': 3246 restart_spus(); 3247 break; 3248 case 'd': 3249 subcmd = inchar(); 3250 if (isxdigit(subcmd) || subcmd == '\n') 3251 termch = subcmd; 3252 case 'f': 3253 scanhex(&num); 3254 if (num >= XMON_NUM_SPUS || !spu_info[num].spu) { 3255 printf("*** Error: invalid spu number\n"); 3256 return 0; 3257 } 3258 3259 switch (cmd) { 3260 case 'f': 3261 dump_spu_fields(spu_info[num].spu); 3262 break; 3263 default: 3264 dump_spu_ls(num, subcmd); 3265 break; 3266 } 3267 3268 break; 3269 default: 3270 return -1; 3271 } 3272 3273 return 0; 3274} 3275#else /* ! CONFIG_SPU_BASE */ 3276static int do_spu_cmd(void) 3277{ 3278 return -1; 3279} 3280#endif 3281