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 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/sched/signal.h> 17 #include <linux/smp.h> 18 #include <linux/mm.h> 19 #include <linux/reboot.h> 20 #include <linux/delay.h> 21 #include <linux/kallsyms.h> 22 #include <linux/kmsg_dump.h> 23 #include <linux/cpumask.h> 24 #include <linux/export.h> 25 #include <linux/sysrq.h> 26 #include <linux/interrupt.h> 27 #include <linux/irq.h> 28 #include <linux/bug.h> 29 #include <linux/nmi.h> 30 #include <linux/ctype.h> 31 #include <linux/highmem.h> 32 33 #include <asm/debugfs.h> 34 #include <asm/ptrace.h> 35 #include <asm/smp.h> 36 #include <asm/string.h> 37 #include <asm/prom.h> 38 #include <asm/machdep.h> 39 #include <asm/xmon.h> 40 #include <asm/processor.h> 41 #include <asm/pgtable.h> 42 #include <asm/mmu.h> 43 #include <asm/mmu_context.h> 44 #include <asm/plpar_wrappers.h> 45 #include <asm/cputable.h> 46 #include <asm/rtas.h> 47 #include <asm/sstep.h> 48 #include <asm/irq_regs.h> 49 #include <asm/spu.h> 50 #include <asm/spu_priv1.h> 51 #include <asm/setjmp.h> 52 #include <asm/reg.h> 53 #include <asm/debug.h> 54 #include <asm/hw_breakpoint.h> 55 #include <asm/xive.h> 56 #include <asm/opal.h> 57 #include <asm/firmware.h> 58 #include <asm/code-patching.h> 59 #include <asm/sections.h> 60 61 #ifdef CONFIG_PPC64 62 #include <asm/hvcall.h> 63 #include <asm/paca.h> 64 #endif 65 66 #include "nonstdio.h" 67 #include "dis-asm.h" 68 69 #ifdef CONFIG_SMP 70 static cpumask_t cpus_in_xmon = CPU_MASK_NONE; 71 static unsigned long xmon_taken = 1; 72 static int xmon_owner; 73 static int xmon_gate; 74 #else 75 #define xmon_owner 0 76 #endif /* CONFIG_SMP */ 77 78 #ifdef CONFIG_PPC_PSERIES 79 static int set_indicator_token = RTAS_UNKNOWN_SERVICE; 80 #endif 81 static unsigned long in_xmon __read_mostly = 0; 82 static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT); 83 84 static unsigned long adrs; 85 static int size = 1; 86 #define MAX_DUMP (128 * 1024) 87 static unsigned long ndump = 64; 88 static unsigned long nidump = 16; 89 static unsigned long ncsum = 4096; 90 static int termch; 91 static char tmpstr[128]; 92 static int tracing_enabled; 93 94 static long bus_error_jmp[JMP_BUF_LEN]; 95 static int catch_memory_errors; 96 static int catch_spr_faults; 97 static long *xmon_fault_jmp[NR_CPUS]; 98 99 /* Breakpoint stuff */ 100 struct bpt { 101 unsigned long address; 102 unsigned int instr[2]; 103 atomic_t ref_count; 104 int enabled; 105 unsigned long pad; 106 }; 107 108 /* Bits in bpt.enabled */ 109 #define BP_CIABR 1 110 #define BP_TRAP 2 111 #define BP_DABR 4 112 113 #define NBPTS 256 114 static struct bpt bpts[NBPTS]; 115 static struct bpt dabr; 116 static struct bpt *iabr; 117 static unsigned bpinstr = 0x7fe00008; /* trap */ 118 119 #define BP_NUM(bp) ((bp) - bpts + 1) 120 121 /* Prototypes */ 122 static int cmds(struct pt_regs *); 123 static int mread(unsigned long, void *, int); 124 static int mwrite(unsigned long, void *, int); 125 static int handle_fault(struct pt_regs *); 126 static void byterev(unsigned char *, int); 127 static void memex(void); 128 static int bsesc(void); 129 static void dump(void); 130 static void show_pte(unsigned long); 131 static void prdump(unsigned long, long); 132 static int ppc_inst_dump(unsigned long, long, int); 133 static void dump_log_buf(void); 134 135 #ifdef CONFIG_PPC_POWERNV 136 static void dump_opal_msglog(void); 137 #else 138 static inline void dump_opal_msglog(void) 139 { 140 printf("Machine is not running OPAL firmware.\n"); 141 } 142 #endif 143 144 static void backtrace(struct pt_regs *); 145 static void excprint(struct pt_regs *); 146 static void prregs(struct pt_regs *); 147 static void memops(int); 148 static void memlocate(void); 149 static void memzcan(void); 150 static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned); 151 int skipbl(void); 152 int scanhex(unsigned long *valp); 153 static void scannl(void); 154 static int hexdigit(int); 155 void getstring(char *, int); 156 static void flush_input(void); 157 static int inchar(void); 158 static void take_input(char *); 159 static int read_spr(int, unsigned long *); 160 static void write_spr(int, unsigned long); 161 static void super_regs(void); 162 static void remove_bpts(void); 163 static void insert_bpts(void); 164 static void remove_cpu_bpts(void); 165 static void insert_cpu_bpts(void); 166 static struct bpt *at_breakpoint(unsigned long pc); 167 static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp); 168 static int do_step(struct pt_regs *); 169 static void bpt_cmds(void); 170 static void cacheflush(void); 171 static int cpu_cmd(void); 172 static void csum(void); 173 static void bootcmds(void); 174 static void proccall(void); 175 static void show_tasks(void); 176 void dump_segments(void); 177 static void symbol_lookup(void); 178 static void xmon_show_stack(unsigned long sp, unsigned long lr, 179 unsigned long pc); 180 static void xmon_print_symbol(unsigned long address, const char *mid, 181 const char *after); 182 static const char *getvecname(unsigned long vec); 183 184 static int do_spu_cmd(void); 185 186 #ifdef CONFIG_44x 187 static void dump_tlb_44x(void); 188 #endif 189 #ifdef CONFIG_PPC_BOOK3E 190 static void dump_tlb_book3e(void); 191 #endif 192 193 #ifdef CONFIG_PPC64 194 #define REG "%.16lx" 195 #else 196 #define REG "%.8lx" 197 #endif 198 199 #ifdef __LITTLE_ENDIAN__ 200 #define GETWORD(v) (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0]) 201 #else 202 #define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3]) 203 #endif 204 205 static char *help_string = "\ 206 Commands:\n\ 207 b show breakpoints\n\ 208 bd set data breakpoint\n\ 209 bi set instruction breakpoint\n\ 210 bc clear breakpoint\n" 211 #ifdef CONFIG_SMP 212 "\ 213 c print cpus stopped in xmon\n\ 214 c# try to switch to cpu number h (in hex)\n" 215 #endif 216 "\ 217 C checksum\n\ 218 d dump bytes\n\ 219 d1 dump 1 byte values\n\ 220 d2 dump 2 byte values\n\ 221 d4 dump 4 byte values\n\ 222 d8 dump 8 byte values\n\ 223 di dump instructions\n\ 224 df dump float values\n\ 225 dd dump double values\n\ 226 dl dump the kernel log buffer\n" 227 #ifdef CONFIG_PPC_POWERNV 228 "\ 229 do dump the OPAL message log\n" 230 #endif 231 #ifdef CONFIG_PPC64 232 "\ 233 dp[#] dump paca for current cpu, or cpu #\n\ 234 dpa dump paca for all possible cpus\n" 235 #endif 236 "\ 237 dr dump stream of raw bytes\n\ 238 dv dump virtual address translation \n\ 239 dt dump the tracing buffers (uses printk)\n\ 240 dtc dump the tracing buffers for current CPU (uses printk)\n\ 241 " 242 #ifdef CONFIG_PPC_POWERNV 243 " dx# dump xive on CPU #\n\ 244 dxi# dump xive irq state #\n\ 245 dxa dump xive on all CPUs\n" 246 #endif 247 " e print exception information\n\ 248 f flush cache\n\ 249 la lookup symbol+offset of specified address\n\ 250 ls lookup address of specified symbol\n\ 251 lp s [#] lookup address of percpu symbol s for current cpu, or cpu #\n\ 252 m examine/change memory\n\ 253 mm move a block of memory\n\ 254 ms set a block of memory\n\ 255 md compare two blocks of memory\n\ 256 ml locate a block of memory\n\ 257 mz zero a block of memory\n\ 258 mi show information about memory allocation\n\ 259 p call a procedure\n\ 260 P list processes/tasks\n\ 261 r print registers\n\ 262 s single step\n" 263 #ifdef CONFIG_SPU_BASE 264 " ss stop execution on all spus\n\ 265 sr restore execution on stopped spus\n\ 266 sf # dump spu fields for spu # (in hex)\n\ 267 sd # dump spu local store for spu # (in hex)\n\ 268 sdi # disassemble spu local store for spu # (in hex)\n" 269 #endif 270 " S print special registers\n\ 271 Sa print all SPRs\n\ 272 Sr # read SPR #\n\ 273 Sw #v write v to SPR #\n\ 274 t print backtrace\n\ 275 x exit monitor and recover\n\ 276 X exit monitor and don't recover\n" 277 #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E) 278 " u dump segment table or SLB\n" 279 #elif defined(CONFIG_PPC_BOOK3S_32) 280 " u dump segment registers\n" 281 #elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E) 282 " u dump TLB\n" 283 #endif 284 " U show uptime information\n" 285 " ? help\n" 286 " # n limit output to n lines per page (for dp, dpa, dl)\n" 287 " zr reboot\n\ 288 zh halt\n" 289 ; 290 291 static struct pt_regs *xmon_regs; 292 293 static inline void sync(void) 294 { 295 asm volatile("sync; isync"); 296 } 297 298 static inline void store_inst(void *p) 299 { 300 asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p)); 301 } 302 303 static inline void cflush(void *p) 304 { 305 asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p)); 306 } 307 308 static inline void cinval(void *p) 309 { 310 asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p)); 311 } 312 313 /** 314 * write_ciabr() - write the CIABR SPR 315 * @ciabr: The value to write. 316 * 317 * This function writes a value to the CIARB register either directly 318 * through mtspr instruction if the kernel is in HV privilege mode or 319 * call a hypervisor function to achieve the same in case the kernel 320 * is in supervisor privilege mode. 321 */ 322 static void write_ciabr(unsigned long ciabr) 323 { 324 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 325 return; 326 327 if (cpu_has_feature(CPU_FTR_HVMODE)) { 328 mtspr(SPRN_CIABR, ciabr); 329 return; 330 } 331 plpar_set_ciabr(ciabr); 332 } 333 334 /** 335 * set_ciabr() - set the CIABR 336 * @addr: The value to set. 337 * 338 * This function sets the correct privilege value into the the HW 339 * breakpoint address before writing it up in the CIABR register. 340 */ 341 static void set_ciabr(unsigned long addr) 342 { 343 addr &= ~CIABR_PRIV; 344 345 if (cpu_has_feature(CPU_FTR_HVMODE)) 346 addr |= CIABR_PRIV_HYPER; 347 else 348 addr |= CIABR_PRIV_SUPER; 349 write_ciabr(addr); 350 } 351 352 /* 353 * Disable surveillance (the service processor watchdog function) 354 * while we are in xmon. 355 * XXX we should re-enable it when we leave. :) 356 */ 357 #define SURVEILLANCE_TOKEN 9000 358 359 static inline void disable_surveillance(void) 360 { 361 #ifdef CONFIG_PPC_PSERIES 362 /* Since this can't be a module, args should end up below 4GB. */ 363 static struct rtas_args args; 364 365 /* 366 * At this point we have got all the cpus we can into 367 * xmon, so there is hopefully no other cpu calling RTAS 368 * at the moment, even though we don't take rtas.lock. 369 * If we did try to take rtas.lock there would be a 370 * real possibility of deadlock. 371 */ 372 if (set_indicator_token == RTAS_UNKNOWN_SERVICE) 373 return; 374 375 rtas_call_unlocked(&args, set_indicator_token, 3, 1, NULL, 376 SURVEILLANCE_TOKEN, 0, 0); 377 378 #endif /* CONFIG_PPC_PSERIES */ 379 } 380 381 #ifdef CONFIG_SMP 382 static int xmon_speaker; 383 384 static void get_output_lock(void) 385 { 386 int me = smp_processor_id() + 0x100; 387 int last_speaker = 0, prev; 388 long timeout; 389 390 if (xmon_speaker == me) 391 return; 392 393 for (;;) { 394 last_speaker = cmpxchg(&xmon_speaker, 0, me); 395 if (last_speaker == 0) 396 return; 397 398 /* 399 * Wait a full second for the lock, we might be on a slow 400 * console, but check every 100us. 401 */ 402 timeout = 10000; 403 while (xmon_speaker == last_speaker) { 404 if (--timeout > 0) { 405 udelay(100); 406 continue; 407 } 408 409 /* hostile takeover */ 410 prev = cmpxchg(&xmon_speaker, last_speaker, me); 411 if (prev == last_speaker) 412 return; 413 break; 414 } 415 } 416 } 417 418 static void release_output_lock(void) 419 { 420 xmon_speaker = 0; 421 } 422 423 int cpus_are_in_xmon(void) 424 { 425 return !cpumask_empty(&cpus_in_xmon); 426 } 427 428 static bool wait_for_other_cpus(int ncpus) 429 { 430 unsigned long timeout; 431 432 /* We wait for 2s, which is a metric "little while" */ 433 for (timeout = 20000; timeout != 0; --timeout) { 434 if (cpumask_weight(&cpus_in_xmon) >= ncpus) 435 return true; 436 udelay(100); 437 barrier(); 438 } 439 440 return false; 441 } 442 #endif /* CONFIG_SMP */ 443 444 static inline int unrecoverable_excp(struct pt_regs *regs) 445 { 446 #if defined(CONFIG_4xx) || defined(CONFIG_PPC_BOOK3E) 447 /* We have no MSR_RI bit on 4xx or Book3e, so we simply return false */ 448 return 0; 449 #else 450 return ((regs->msr & MSR_RI) == 0); 451 #endif 452 } 453 454 static int xmon_core(struct pt_regs *regs, int fromipi) 455 { 456 int cmd = 0; 457 struct bpt *bp; 458 long recurse_jmp[JMP_BUF_LEN]; 459 unsigned long offset; 460 unsigned long flags; 461 #ifdef CONFIG_SMP 462 int cpu; 463 int secondary; 464 #endif 465 466 local_irq_save(flags); 467 hard_irq_disable(); 468 469 tracing_enabled = tracing_is_on(); 470 tracing_off(); 471 472 bp = in_breakpoint_table(regs->nip, &offset); 473 if (bp != NULL) { 474 regs->nip = bp->address + offset; 475 atomic_dec(&bp->ref_count); 476 } 477 478 remove_cpu_bpts(); 479 480 #ifdef CONFIG_SMP 481 cpu = smp_processor_id(); 482 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { 483 /* 484 * We catch SPR read/write faults here because the 0x700, 0xf60 485 * etc. handlers don't call debugger_fault_handler(). 486 */ 487 if (catch_spr_faults) 488 longjmp(bus_error_jmp, 1); 489 get_output_lock(); 490 excprint(regs); 491 printf("cpu 0x%x: Exception %lx %s in xmon, " 492 "returning to main loop\n", 493 cpu, regs->trap, getvecname(TRAP(regs))); 494 release_output_lock(); 495 longjmp(xmon_fault_jmp[cpu], 1); 496 } 497 498 if (setjmp(recurse_jmp) != 0) { 499 if (!in_xmon || !xmon_gate) { 500 get_output_lock(); 501 printf("xmon: WARNING: bad recursive fault " 502 "on cpu 0x%x\n", cpu); 503 release_output_lock(); 504 goto waiting; 505 } 506 secondary = !(xmon_taken && cpu == xmon_owner); 507 goto cmdloop; 508 } 509 510 xmon_fault_jmp[cpu] = recurse_jmp; 511 512 bp = NULL; 513 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) 514 bp = at_breakpoint(regs->nip); 515 if (bp || unrecoverable_excp(regs)) 516 fromipi = 0; 517 518 if (!fromipi) { 519 get_output_lock(); 520 excprint(regs); 521 if (bp) { 522 printf("cpu 0x%x stopped at breakpoint 0x%tx (", 523 cpu, BP_NUM(bp)); 524 xmon_print_symbol(regs->nip, " ", ")\n"); 525 } 526 if (unrecoverable_excp(regs)) 527 printf("WARNING: exception is not recoverable, " 528 "can't continue\n"); 529 release_output_lock(); 530 } 531 532 cpumask_set_cpu(cpu, &cpus_in_xmon); 533 534 waiting: 535 secondary = 1; 536 spin_begin(); 537 while (secondary && !xmon_gate) { 538 if (in_xmon == 0) { 539 if (fromipi) { 540 spin_end(); 541 goto leave; 542 } 543 secondary = test_and_set_bit(0, &in_xmon); 544 } 545 spin_cpu_relax(); 546 touch_nmi_watchdog(); 547 } 548 spin_end(); 549 550 if (!secondary && !xmon_gate) { 551 /* we are the first cpu to come in */ 552 /* interrupt other cpu(s) */ 553 int ncpus = num_online_cpus(); 554 555 xmon_owner = cpu; 556 mb(); 557 if (ncpus > 1) { 558 /* 559 * A system reset (trap == 0x100) can be triggered on 560 * all CPUs, so when we come in via 0x100 try waiting 561 * for the other CPUs to come in before we send the 562 * debugger break (IPI). This is similar to 563 * crash_kexec_secondary(). 564 */ 565 if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus)) 566 smp_send_debugger_break(); 567 568 wait_for_other_cpus(ncpus); 569 } 570 remove_bpts(); 571 disable_surveillance(); 572 /* for breakpoint or single step, print the current instr. */ 573 if (bp || TRAP(regs) == 0xd00) 574 ppc_inst_dump(regs->nip, 1, 0); 575 printf("enter ? for help\n"); 576 mb(); 577 xmon_gate = 1; 578 barrier(); 579 touch_nmi_watchdog(); 580 } 581 582 cmdloop: 583 while (in_xmon) { 584 if (secondary) { 585 spin_begin(); 586 if (cpu == xmon_owner) { 587 if (!test_and_set_bit(0, &xmon_taken)) { 588 secondary = 0; 589 spin_end(); 590 continue; 591 } 592 /* missed it */ 593 while (cpu == xmon_owner) 594 spin_cpu_relax(); 595 } 596 spin_cpu_relax(); 597 touch_nmi_watchdog(); 598 } else { 599 cmd = cmds(regs); 600 if (cmd != 0) { 601 /* exiting xmon */ 602 insert_bpts(); 603 xmon_gate = 0; 604 wmb(); 605 in_xmon = 0; 606 break; 607 } 608 /* have switched to some other cpu */ 609 secondary = 1; 610 } 611 } 612 leave: 613 cpumask_clear_cpu(cpu, &cpus_in_xmon); 614 xmon_fault_jmp[cpu] = NULL; 615 #else 616 /* UP is simple... */ 617 if (in_xmon) { 618 printf("Exception %lx %s in xmon, returning to main loop\n", 619 regs->trap, getvecname(TRAP(regs))); 620 longjmp(xmon_fault_jmp[0], 1); 621 } 622 if (setjmp(recurse_jmp) == 0) { 623 xmon_fault_jmp[0] = recurse_jmp; 624 in_xmon = 1; 625 626 excprint(regs); 627 bp = at_breakpoint(regs->nip); 628 if (bp) { 629 printf("Stopped at breakpoint %tx (", BP_NUM(bp)); 630 xmon_print_symbol(regs->nip, " ", ")\n"); 631 } 632 if (unrecoverable_excp(regs)) 633 printf("WARNING: exception is not recoverable, " 634 "can't continue\n"); 635 remove_bpts(); 636 disable_surveillance(); 637 /* for breakpoint or single step, print the current instr. */ 638 if (bp || TRAP(regs) == 0xd00) 639 ppc_inst_dump(regs->nip, 1, 0); 640 printf("enter ? for help\n"); 641 } 642 643 cmd = cmds(regs); 644 645 insert_bpts(); 646 in_xmon = 0; 647 #endif 648 649 #ifdef CONFIG_BOOKE 650 if (regs->msr & MSR_DE) { 651 bp = at_breakpoint(regs->nip); 652 if (bp != NULL) { 653 regs->nip = (unsigned long) &bp->instr[0]; 654 atomic_inc(&bp->ref_count); 655 } 656 } 657 #else 658 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { 659 bp = at_breakpoint(regs->nip); 660 if (bp != NULL) { 661 int stepped = emulate_step(regs, bp->instr[0]); 662 if (stepped == 0) { 663 regs->nip = (unsigned long) &bp->instr[0]; 664 atomic_inc(&bp->ref_count); 665 } else if (stepped < 0) { 666 printf("Couldn't single-step %s instruction\n", 667 (IS_RFID(bp->instr[0])? "rfid": "mtmsrd")); 668 } 669 } 670 } 671 #endif 672 insert_cpu_bpts(); 673 674 touch_nmi_watchdog(); 675 local_irq_restore(flags); 676 677 return cmd != 'X' && cmd != EOF; 678 } 679 680 int xmon(struct pt_regs *excp) 681 { 682 struct pt_regs regs; 683 684 if (excp == NULL) { 685 ppc_save_regs(®s); 686 excp = ®s; 687 } 688 689 return xmon_core(excp, 0); 690 } 691 EXPORT_SYMBOL(xmon); 692 693 irqreturn_t xmon_irq(int irq, void *d) 694 { 695 unsigned long flags; 696 local_irq_save(flags); 697 printf("Keyboard interrupt\n"); 698 xmon(get_irq_regs()); 699 local_irq_restore(flags); 700 return IRQ_HANDLED; 701 } 702 703 static int xmon_bpt(struct pt_regs *regs) 704 { 705 struct bpt *bp; 706 unsigned long offset; 707 708 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 709 return 0; 710 711 /* Are we at the trap at bp->instr[1] for some bp? */ 712 bp = in_breakpoint_table(regs->nip, &offset); 713 if (bp != NULL && offset == 4) { 714 regs->nip = bp->address + 4; 715 atomic_dec(&bp->ref_count); 716 return 1; 717 } 718 719 /* Are we at a breakpoint? */ 720 bp = at_breakpoint(regs->nip); 721 if (!bp) 722 return 0; 723 724 xmon_core(regs, 0); 725 726 return 1; 727 } 728 729 static int xmon_sstep(struct pt_regs *regs) 730 { 731 if (user_mode(regs)) 732 return 0; 733 xmon_core(regs, 0); 734 return 1; 735 } 736 737 static int xmon_break_match(struct pt_regs *regs) 738 { 739 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 740 return 0; 741 if (dabr.enabled == 0) 742 return 0; 743 xmon_core(regs, 0); 744 return 1; 745 } 746 747 static int xmon_iabr_match(struct pt_regs *regs) 748 { 749 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 750 return 0; 751 if (iabr == NULL) 752 return 0; 753 xmon_core(regs, 0); 754 return 1; 755 } 756 757 static int xmon_ipi(struct pt_regs *regs) 758 { 759 #ifdef CONFIG_SMP 760 if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon)) 761 xmon_core(regs, 1); 762 #endif 763 return 0; 764 } 765 766 static int xmon_fault_handler(struct pt_regs *regs) 767 { 768 struct bpt *bp; 769 unsigned long offset; 770 771 if (in_xmon && catch_memory_errors) 772 handle_fault(regs); /* doesn't return */ 773 774 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { 775 bp = in_breakpoint_table(regs->nip, &offset); 776 if (bp != NULL) { 777 regs->nip = bp->address + offset; 778 atomic_dec(&bp->ref_count); 779 } 780 } 781 782 return 0; 783 } 784 785 /* Force enable xmon if not already enabled */ 786 static inline void force_enable_xmon(void) 787 { 788 /* Enable xmon hooks if needed */ 789 if (!xmon_on) { 790 printf("xmon: Enabling debugger hooks\n"); 791 xmon_on = 1; 792 } 793 } 794 795 static struct bpt *at_breakpoint(unsigned long pc) 796 { 797 int i; 798 struct bpt *bp; 799 800 bp = bpts; 801 for (i = 0; i < NBPTS; ++i, ++bp) 802 if (bp->enabled && pc == bp->address) 803 return bp; 804 return NULL; 805 } 806 807 static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp) 808 { 809 unsigned long off; 810 811 off = nip - (unsigned long) bpts; 812 if (off >= sizeof(bpts)) 813 return NULL; 814 off %= sizeof(struct bpt); 815 if (off != offsetof(struct bpt, instr[0]) 816 && off != offsetof(struct bpt, instr[1])) 817 return NULL; 818 *offp = off - offsetof(struct bpt, instr[0]); 819 return (struct bpt *) (nip - off); 820 } 821 822 static struct bpt *new_breakpoint(unsigned long a) 823 { 824 struct bpt *bp; 825 826 a &= ~3UL; 827 bp = at_breakpoint(a); 828 if (bp) 829 return bp; 830 831 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { 832 if (!bp->enabled && atomic_read(&bp->ref_count) == 0) { 833 bp->address = a; 834 bp->instr[1] = bpinstr; 835 store_inst(&bp->instr[1]); 836 return bp; 837 } 838 } 839 840 printf("Sorry, no free breakpoints. Please clear one first.\n"); 841 return NULL; 842 } 843 844 static void insert_bpts(void) 845 { 846 int i; 847 struct bpt *bp; 848 849 bp = bpts; 850 for (i = 0; i < NBPTS; ++i, ++bp) { 851 if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0) 852 continue; 853 if (mread(bp->address, &bp->instr[0], 4) != 4) { 854 printf("Couldn't read instruction at %lx, " 855 "disabling breakpoint there\n", bp->address); 856 bp->enabled = 0; 857 continue; 858 } 859 if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) { 860 printf("Breakpoint at %lx is on an mtmsrd or rfid " 861 "instruction, disabling it\n", bp->address); 862 bp->enabled = 0; 863 continue; 864 } 865 store_inst(&bp->instr[0]); 866 if (bp->enabled & BP_CIABR) 867 continue; 868 if (patch_instruction((unsigned int *)bp->address, 869 bpinstr) != 0) { 870 printf("Couldn't write instruction at %lx, " 871 "disabling breakpoint there\n", bp->address); 872 bp->enabled &= ~BP_TRAP; 873 continue; 874 } 875 store_inst((void *)bp->address); 876 } 877 } 878 879 static void insert_cpu_bpts(void) 880 { 881 struct arch_hw_breakpoint brk; 882 883 if (dabr.enabled) { 884 brk.address = dabr.address; 885 brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL; 886 brk.len = 8; 887 __set_breakpoint(&brk); 888 } 889 890 if (iabr) 891 set_ciabr(iabr->address); 892 } 893 894 static void remove_bpts(void) 895 { 896 int i; 897 struct bpt *bp; 898 unsigned instr; 899 900 bp = bpts; 901 for (i = 0; i < NBPTS; ++i, ++bp) { 902 if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP) 903 continue; 904 if (mread(bp->address, &instr, 4) == 4 905 && instr == bpinstr 906 && patch_instruction( 907 (unsigned int *)bp->address, bp->instr[0]) != 0) 908 printf("Couldn't remove breakpoint at %lx\n", 909 bp->address); 910 else 911 store_inst((void *)bp->address); 912 } 913 } 914 915 static void remove_cpu_bpts(void) 916 { 917 hw_breakpoint_disable(); 918 write_ciabr(0); 919 } 920 921 /* Based on uptime_proc_show(). */ 922 static void 923 show_uptime(void) 924 { 925 struct timespec64 uptime; 926 927 if (setjmp(bus_error_jmp) == 0) { 928 catch_memory_errors = 1; 929 sync(); 930 931 ktime_get_coarse_boottime_ts64(&uptime); 932 printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec, 933 ((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100))); 934 935 sync(); 936 __delay(200); \ 937 } 938 catch_memory_errors = 0; 939 } 940 941 static void set_lpp_cmd(void) 942 { 943 unsigned long lpp; 944 945 if (!scanhex(&lpp)) { 946 printf("Invalid number.\n"); 947 lpp = 0; 948 } 949 xmon_set_pagination_lpp(lpp); 950 } 951 /* Command interpreting routine */ 952 static char *last_cmd; 953 954 static int 955 cmds(struct pt_regs *excp) 956 { 957 int cmd = 0; 958 959 last_cmd = NULL; 960 xmon_regs = excp; 961 962 xmon_show_stack(excp->gpr[1], excp->link, excp->nip); 963 964 for(;;) { 965 #ifdef CONFIG_SMP 966 printf("%x:", smp_processor_id()); 967 #endif /* CONFIG_SMP */ 968 printf("mon> "); 969 flush_input(); 970 termch = 0; 971 cmd = skipbl(); 972 if( cmd == '\n' ) { 973 if (last_cmd == NULL) 974 continue; 975 take_input(last_cmd); 976 last_cmd = NULL; 977 cmd = inchar(); 978 } 979 switch (cmd) { 980 case 'm': 981 cmd = inchar(); 982 switch (cmd) { 983 case 'm': 984 case 's': 985 case 'd': 986 memops(cmd); 987 break; 988 case 'l': 989 memlocate(); 990 break; 991 case 'z': 992 memzcan(); 993 break; 994 case 'i': 995 show_mem(0, NULL); 996 break; 997 default: 998 termch = cmd; 999 memex(); 1000 } 1001 break; 1002 case 'd': 1003 dump(); 1004 break; 1005 case 'l': 1006 symbol_lookup(); 1007 break; 1008 case 'r': 1009 prregs(excp); /* print regs */ 1010 break; 1011 case 'e': 1012 excprint(excp); 1013 break; 1014 case 'S': 1015 super_regs(); 1016 break; 1017 case 't': 1018 backtrace(excp); 1019 break; 1020 case 'f': 1021 cacheflush(); 1022 break; 1023 case 's': 1024 if (do_spu_cmd() == 0) 1025 break; 1026 if (do_step(excp)) 1027 return cmd; 1028 break; 1029 case 'x': 1030 case 'X': 1031 if (tracing_enabled) 1032 tracing_on(); 1033 return cmd; 1034 case EOF: 1035 printf(" <no input ...>\n"); 1036 mdelay(2000); 1037 return cmd; 1038 case '?': 1039 xmon_puts(help_string); 1040 break; 1041 case '#': 1042 set_lpp_cmd(); 1043 break; 1044 case 'b': 1045 bpt_cmds(); 1046 break; 1047 case 'C': 1048 csum(); 1049 break; 1050 case 'c': 1051 if (cpu_cmd()) 1052 return 0; 1053 break; 1054 case 'z': 1055 bootcmds(); 1056 break; 1057 case 'p': 1058 proccall(); 1059 break; 1060 case 'P': 1061 show_tasks(); 1062 break; 1063 #ifdef CONFIG_PPC_BOOK3S 1064 case 'u': 1065 dump_segments(); 1066 break; 1067 #elif defined(CONFIG_44x) 1068 case 'u': 1069 dump_tlb_44x(); 1070 break; 1071 #elif defined(CONFIG_PPC_BOOK3E) 1072 case 'u': 1073 dump_tlb_book3e(); 1074 break; 1075 #endif 1076 case 'U': 1077 show_uptime(); 1078 break; 1079 default: 1080 printf("Unrecognized command: "); 1081 do { 1082 if (' ' < cmd && cmd <= '~') 1083 putchar(cmd); 1084 else 1085 printf("\\x%x", cmd); 1086 cmd = inchar(); 1087 } while (cmd != '\n'); 1088 printf(" (type ? for help)\n"); 1089 break; 1090 } 1091 } 1092 } 1093 1094 #ifdef CONFIG_BOOKE 1095 static int do_step(struct pt_regs *regs) 1096 { 1097 regs->msr |= MSR_DE; 1098 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); 1099 return 1; 1100 } 1101 #else 1102 /* 1103 * Step a single instruction. 1104 * Some instructions we emulate, others we execute with MSR_SE set. 1105 */ 1106 static int do_step(struct pt_regs *regs) 1107 { 1108 unsigned int instr; 1109 int stepped; 1110 1111 force_enable_xmon(); 1112 /* check we are in 64-bit kernel mode, translation enabled */ 1113 if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) { 1114 if (mread(regs->nip, &instr, 4) == 4) { 1115 stepped = emulate_step(regs, instr); 1116 if (stepped < 0) { 1117 printf("Couldn't single-step %s instruction\n", 1118 (IS_RFID(instr)? "rfid": "mtmsrd")); 1119 return 0; 1120 } 1121 if (stepped > 0) { 1122 regs->trap = 0xd00 | (regs->trap & 1); 1123 printf("stepped to "); 1124 xmon_print_symbol(regs->nip, " ", "\n"); 1125 ppc_inst_dump(regs->nip, 1, 0); 1126 return 0; 1127 } 1128 } 1129 } 1130 regs->msr |= MSR_SE; 1131 return 1; 1132 } 1133 #endif 1134 1135 static void bootcmds(void) 1136 { 1137 int cmd; 1138 1139 cmd = inchar(); 1140 if (cmd == 'r') 1141 ppc_md.restart(NULL); 1142 else if (cmd == 'h') 1143 ppc_md.halt(); 1144 else if (cmd == 'p') 1145 if (pm_power_off) 1146 pm_power_off(); 1147 } 1148 1149 static int cpu_cmd(void) 1150 { 1151 #ifdef CONFIG_SMP 1152 unsigned long cpu, first_cpu, last_cpu; 1153 int timeout; 1154 1155 if (!scanhex(&cpu)) { 1156 /* print cpus waiting or in xmon */ 1157 printf("cpus stopped:"); 1158 last_cpu = first_cpu = NR_CPUS; 1159 for_each_possible_cpu(cpu) { 1160 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { 1161 if (cpu == last_cpu + 1) { 1162 last_cpu = cpu; 1163 } else { 1164 if (last_cpu != first_cpu) 1165 printf("-0x%lx", last_cpu); 1166 last_cpu = first_cpu = cpu; 1167 printf(" 0x%lx", cpu); 1168 } 1169 } 1170 } 1171 if (last_cpu != first_cpu) 1172 printf("-0x%lx", last_cpu); 1173 printf("\n"); 1174 return 0; 1175 } 1176 /* try to switch to cpu specified */ 1177 if (!cpumask_test_cpu(cpu, &cpus_in_xmon)) { 1178 printf("cpu 0x%lx isn't in xmon\n", cpu); 1179 #ifdef CONFIG_PPC64 1180 printf("backtrace of paca[0x%lx].saved_r1 (possibly stale):\n", cpu); 1181 xmon_show_stack(paca_ptrs[cpu]->saved_r1, 0, 0); 1182 #endif 1183 return 0; 1184 } 1185 xmon_taken = 0; 1186 mb(); 1187 xmon_owner = cpu; 1188 timeout = 10000000; 1189 while (!xmon_taken) { 1190 if (--timeout == 0) { 1191 if (test_and_set_bit(0, &xmon_taken)) 1192 break; 1193 /* take control back */ 1194 mb(); 1195 xmon_owner = smp_processor_id(); 1196 printf("cpu 0x%lx didn't take control\n", cpu); 1197 return 0; 1198 } 1199 barrier(); 1200 } 1201 return 1; 1202 #else 1203 return 0; 1204 #endif /* CONFIG_SMP */ 1205 } 1206 1207 static unsigned short fcstab[256] = { 1208 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 1209 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 1210 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 1211 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 1212 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 1213 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 1214 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 1215 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 1216 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 1217 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 1218 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 1219 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 1220 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 1221 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 1222 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 1223 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 1224 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 1225 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 1226 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 1227 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 1228 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 1229 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 1230 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 1231 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 1232 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 1233 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 1234 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 1235 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 1236 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 1237 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 1238 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 1239 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 1240 }; 1241 1242 #define FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff]) 1243 1244 static void 1245 csum(void) 1246 { 1247 unsigned int i; 1248 unsigned short fcs; 1249 unsigned char v; 1250 1251 if (!scanhex(&adrs)) 1252 return; 1253 if (!scanhex(&ncsum)) 1254 return; 1255 fcs = 0xffff; 1256 for (i = 0; i < ncsum; ++i) { 1257 if (mread(adrs+i, &v, 1) == 0) { 1258 printf("csum stopped at "REG"\n", adrs+i); 1259 break; 1260 } 1261 fcs = FCS(fcs, v); 1262 } 1263 printf("%x\n", fcs); 1264 } 1265 1266 /* 1267 * Check if this is a suitable place to put a breakpoint. 1268 */ 1269 static long check_bp_loc(unsigned long addr) 1270 { 1271 unsigned int instr; 1272 1273 addr &= ~3; 1274 if (!is_kernel_addr(addr)) { 1275 printf("Breakpoints may only be placed at kernel addresses\n"); 1276 return 0; 1277 } 1278 if (!mread(addr, &instr, sizeof(instr))) { 1279 printf("Can't read instruction at address %lx\n", addr); 1280 return 0; 1281 } 1282 if (IS_MTMSRD(instr) || IS_RFID(instr)) { 1283 printf("Breakpoints may not be placed on mtmsrd or rfid " 1284 "instructions\n"); 1285 return 0; 1286 } 1287 return 1; 1288 } 1289 1290 static char *breakpoint_help_string = 1291 "Breakpoint command usage:\n" 1292 "b show breakpoints\n" 1293 "b <addr> [cnt] set breakpoint at given instr addr\n" 1294 "bc clear all breakpoints\n" 1295 "bc <n/addr> clear breakpoint number n or at addr\n" 1296 "bi <addr> [cnt] set hardware instr breakpoint (POWER8 only)\n" 1297 "bd <addr> [cnt] set hardware data breakpoint\n" 1298 ""; 1299 1300 static void 1301 bpt_cmds(void) 1302 { 1303 int cmd; 1304 unsigned long a; 1305 int i; 1306 struct bpt *bp; 1307 1308 cmd = inchar(); 1309 switch (cmd) { 1310 #ifndef CONFIG_PPC_8xx 1311 static const char badaddr[] = "Only kernel addresses are permitted for breakpoints\n"; 1312 int mode; 1313 case 'd': /* bd - hardware data breakpoint */ 1314 if (!ppc_breakpoint_available()) { 1315 printf("Hardware data breakpoint not supported on this cpu\n"); 1316 break; 1317 } 1318 mode = 7; 1319 cmd = inchar(); 1320 if (cmd == 'r') 1321 mode = 5; 1322 else if (cmd == 'w') 1323 mode = 6; 1324 else 1325 termch = cmd; 1326 dabr.address = 0; 1327 dabr.enabled = 0; 1328 if (scanhex(&dabr.address)) { 1329 if (!is_kernel_addr(dabr.address)) { 1330 printf(badaddr); 1331 break; 1332 } 1333 dabr.address &= ~HW_BRK_TYPE_DABR; 1334 dabr.enabled = mode | BP_DABR; 1335 } 1336 1337 force_enable_xmon(); 1338 break; 1339 1340 case 'i': /* bi - hardware instr breakpoint */ 1341 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) { 1342 printf("Hardware instruction breakpoint " 1343 "not supported on this cpu\n"); 1344 break; 1345 } 1346 if (iabr) { 1347 iabr->enabled &= ~BP_CIABR; 1348 iabr = NULL; 1349 } 1350 if (!scanhex(&a)) 1351 break; 1352 if (!check_bp_loc(a)) 1353 break; 1354 bp = new_breakpoint(a); 1355 if (bp != NULL) { 1356 bp->enabled |= BP_CIABR; 1357 iabr = bp; 1358 force_enable_xmon(); 1359 } 1360 break; 1361 #endif 1362 1363 case 'c': 1364 if (!scanhex(&a)) { 1365 /* clear all breakpoints */ 1366 for (i = 0; i < NBPTS; ++i) 1367 bpts[i].enabled = 0; 1368 iabr = NULL; 1369 dabr.enabled = 0; 1370 printf("All breakpoints cleared\n"); 1371 break; 1372 } 1373 1374 if (a <= NBPTS && a >= 1) { 1375 /* assume a breakpoint number */ 1376 bp = &bpts[a-1]; /* bp nums are 1 based */ 1377 } else { 1378 /* assume a breakpoint address */ 1379 bp = at_breakpoint(a); 1380 if (bp == NULL) { 1381 printf("No breakpoint at %lx\n", a); 1382 break; 1383 } 1384 } 1385 1386 printf("Cleared breakpoint %tx (", BP_NUM(bp)); 1387 xmon_print_symbol(bp->address, " ", ")\n"); 1388 bp->enabled = 0; 1389 break; 1390 1391 default: 1392 termch = cmd; 1393 cmd = skipbl(); 1394 if (cmd == '?') { 1395 printf(breakpoint_help_string); 1396 break; 1397 } 1398 termch = cmd; 1399 if (!scanhex(&a)) { 1400 /* print all breakpoints */ 1401 printf(" type address\n"); 1402 if (dabr.enabled) { 1403 printf(" data "REG" [", dabr.address); 1404 if (dabr.enabled & 1) 1405 printf("r"); 1406 if (dabr.enabled & 2) 1407 printf("w"); 1408 printf("]\n"); 1409 } 1410 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { 1411 if (!bp->enabled) 1412 continue; 1413 printf("%tx %s ", BP_NUM(bp), 1414 (bp->enabled & BP_CIABR) ? "inst": "trap"); 1415 xmon_print_symbol(bp->address, " ", "\n"); 1416 } 1417 break; 1418 } 1419 1420 if (!check_bp_loc(a)) 1421 break; 1422 bp = new_breakpoint(a); 1423 if (bp != NULL) { 1424 bp->enabled |= BP_TRAP; 1425 force_enable_xmon(); 1426 } 1427 break; 1428 } 1429 } 1430 1431 /* Very cheap human name for vector lookup. */ 1432 static 1433 const char *getvecname(unsigned long vec) 1434 { 1435 char *ret; 1436 1437 switch (vec) { 1438 case 0x100: ret = "(System Reset)"; break; 1439 case 0x200: ret = "(Machine Check)"; break; 1440 case 0x300: ret = "(Data Access)"; break; 1441 case 0x380: 1442 if (radix_enabled()) 1443 ret = "(Data Access Out of Range)"; 1444 else 1445 ret = "(Data SLB Access)"; 1446 break; 1447 case 0x400: ret = "(Instruction Access)"; break; 1448 case 0x480: 1449 if (radix_enabled()) 1450 ret = "(Instruction Access Out of Range)"; 1451 else 1452 ret = "(Instruction SLB Access)"; 1453 break; 1454 case 0x500: ret = "(Hardware Interrupt)"; break; 1455 case 0x600: ret = "(Alignment)"; break; 1456 case 0x700: ret = "(Program Check)"; break; 1457 case 0x800: ret = "(FPU Unavailable)"; break; 1458 case 0x900: ret = "(Decrementer)"; break; 1459 case 0x980: ret = "(Hypervisor Decrementer)"; break; 1460 case 0xa00: ret = "(Doorbell)"; break; 1461 case 0xc00: ret = "(System Call)"; break; 1462 case 0xd00: ret = "(Single Step)"; break; 1463 case 0xe40: ret = "(Emulation Assist)"; break; 1464 case 0xe60: ret = "(HMI)"; break; 1465 case 0xe80: ret = "(Hypervisor Doorbell)"; break; 1466 case 0xf00: ret = "(Performance Monitor)"; break; 1467 case 0xf20: ret = "(Altivec Unavailable)"; break; 1468 case 0x1300: ret = "(Instruction Breakpoint)"; break; 1469 case 0x1500: ret = "(Denormalisation)"; break; 1470 case 0x1700: ret = "(Altivec Assist)"; break; 1471 default: ret = ""; 1472 } 1473 return ret; 1474 } 1475 1476 static void get_function_bounds(unsigned long pc, unsigned long *startp, 1477 unsigned long *endp) 1478 { 1479 unsigned long size, offset; 1480 const char *name; 1481 1482 *startp = *endp = 0; 1483 if (pc == 0) 1484 return; 1485 if (setjmp(bus_error_jmp) == 0) { 1486 catch_memory_errors = 1; 1487 sync(); 1488 name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr); 1489 if (name != NULL) { 1490 *startp = pc - offset; 1491 *endp = pc - offset + size; 1492 } 1493 sync(); 1494 } 1495 catch_memory_errors = 0; 1496 } 1497 1498 #define LRSAVE_OFFSET (STACK_FRAME_LR_SAVE * sizeof(unsigned long)) 1499 #define MARKER_OFFSET (STACK_FRAME_MARKER * sizeof(unsigned long)) 1500 1501 static void xmon_show_stack(unsigned long sp, unsigned long lr, 1502 unsigned long pc) 1503 { 1504 int max_to_print = 64; 1505 unsigned long ip; 1506 unsigned long newsp; 1507 unsigned long marker; 1508 struct pt_regs regs; 1509 1510 while (max_to_print--) { 1511 if (!is_kernel_addr(sp)) { 1512 if (sp != 0) 1513 printf("SP (%lx) is in userspace\n", sp); 1514 break; 1515 } 1516 1517 if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long)) 1518 || !mread(sp, &newsp, sizeof(unsigned long))) { 1519 printf("Couldn't read stack frame at %lx\n", sp); 1520 break; 1521 } 1522 1523 /* 1524 * For the first stack frame, try to work out if 1525 * LR and/or the saved LR value in the bottommost 1526 * stack frame are valid. 1527 */ 1528 if ((pc | lr) != 0) { 1529 unsigned long fnstart, fnend; 1530 unsigned long nextip; 1531 int printip = 1; 1532 1533 get_function_bounds(pc, &fnstart, &fnend); 1534 nextip = 0; 1535 if (newsp > sp) 1536 mread(newsp + LRSAVE_OFFSET, &nextip, 1537 sizeof(unsigned long)); 1538 if (lr == ip) { 1539 if (!is_kernel_addr(lr) 1540 || (fnstart <= lr && lr < fnend)) 1541 printip = 0; 1542 } else if (lr == nextip) { 1543 printip = 0; 1544 } else if (is_kernel_addr(lr) 1545 && !(fnstart <= lr && lr < fnend)) { 1546 printf("[link register ] "); 1547 xmon_print_symbol(lr, " ", "\n"); 1548 } 1549 if (printip) { 1550 printf("["REG"] ", sp); 1551 xmon_print_symbol(ip, " ", " (unreliable)\n"); 1552 } 1553 pc = lr = 0; 1554 1555 } else { 1556 printf("["REG"] ", sp); 1557 xmon_print_symbol(ip, " ", "\n"); 1558 } 1559 1560 /* Look for "regshere" marker to see if this is 1561 an exception frame. */ 1562 if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long)) 1563 && marker == STACK_FRAME_REGS_MARKER) { 1564 if (mread(sp + STACK_FRAME_OVERHEAD, ®s, sizeof(regs)) 1565 != sizeof(regs)) { 1566 printf("Couldn't read registers at %lx\n", 1567 sp + STACK_FRAME_OVERHEAD); 1568 break; 1569 } 1570 printf("--- Exception: %lx %s at ", regs.trap, 1571 getvecname(TRAP(®s))); 1572 pc = regs.nip; 1573 lr = regs.link; 1574 xmon_print_symbol(pc, " ", "\n"); 1575 } 1576 1577 if (newsp == 0) 1578 break; 1579 1580 sp = newsp; 1581 } 1582 } 1583 1584 static void backtrace(struct pt_regs *excp) 1585 { 1586 unsigned long sp; 1587 1588 if (scanhex(&sp)) 1589 xmon_show_stack(sp, 0, 0); 1590 else 1591 xmon_show_stack(excp->gpr[1], excp->link, excp->nip); 1592 scannl(); 1593 } 1594 1595 static void print_bug_trap(struct pt_regs *regs) 1596 { 1597 #ifdef CONFIG_BUG 1598 const struct bug_entry *bug; 1599 unsigned long addr; 1600 1601 if (regs->msr & MSR_PR) 1602 return; /* not in kernel */ 1603 addr = regs->nip; /* address of trap instruction */ 1604 if (!is_kernel_addr(addr)) 1605 return; 1606 bug = find_bug(regs->nip); 1607 if (bug == NULL) 1608 return; 1609 if (is_warning_bug(bug)) 1610 return; 1611 1612 #ifdef CONFIG_DEBUG_BUGVERBOSE 1613 printf("kernel BUG at %s:%u!\n", 1614 bug->file, bug->line); 1615 #else 1616 printf("kernel BUG at %px!\n", (void *)bug->bug_addr); 1617 #endif 1618 #endif /* CONFIG_BUG */ 1619 } 1620 1621 static void excprint(struct pt_regs *fp) 1622 { 1623 unsigned long trap; 1624 1625 #ifdef CONFIG_SMP 1626 printf("cpu 0x%x: ", smp_processor_id()); 1627 #endif /* CONFIG_SMP */ 1628 1629 trap = TRAP(fp); 1630 printf("Vector: %lx %s at [%px]\n", fp->trap, getvecname(trap), fp); 1631 printf(" pc: "); 1632 xmon_print_symbol(fp->nip, ": ", "\n"); 1633 1634 printf(" lr: "); 1635 xmon_print_symbol(fp->link, ": ", "\n"); 1636 1637 printf(" sp: %lx\n", fp->gpr[1]); 1638 printf(" msr: %lx\n", fp->msr); 1639 1640 if (trap == 0x300 || trap == 0x380 || trap == 0x600 || trap == 0x200) { 1641 printf(" dar: %lx\n", fp->dar); 1642 if (trap != 0x380) 1643 printf(" dsisr: %lx\n", fp->dsisr); 1644 } 1645 1646 printf(" current = 0x%px\n", current); 1647 #ifdef CONFIG_PPC64 1648 printf(" paca = 0x%px\t irqmask: 0x%02x\t irq_happened: 0x%02x\n", 1649 local_paca, local_paca->irq_soft_mask, local_paca->irq_happened); 1650 #endif 1651 if (current) { 1652 printf(" pid = %d, comm = %s\n", 1653 current->pid, current->comm); 1654 } 1655 1656 if (trap == 0x700) 1657 print_bug_trap(fp); 1658 1659 printf(linux_banner); 1660 } 1661 1662 static void prregs(struct pt_regs *fp) 1663 { 1664 int n, trap; 1665 unsigned long base; 1666 struct pt_regs regs; 1667 1668 if (scanhex(&base)) { 1669 if (setjmp(bus_error_jmp) == 0) { 1670 catch_memory_errors = 1; 1671 sync(); 1672 regs = *(struct pt_regs *)base; 1673 sync(); 1674 __delay(200); 1675 } else { 1676 catch_memory_errors = 0; 1677 printf("*** Error reading registers from "REG"\n", 1678 base); 1679 return; 1680 } 1681 catch_memory_errors = 0; 1682 fp = ®s; 1683 } 1684 1685 #ifdef CONFIG_PPC64 1686 if (FULL_REGS(fp)) { 1687 for (n = 0; n < 16; ++n) 1688 printf("R%.2d = "REG" R%.2d = "REG"\n", 1689 n, fp->gpr[n], n+16, fp->gpr[n+16]); 1690 } else { 1691 for (n = 0; n < 7; ++n) 1692 printf("R%.2d = "REG" R%.2d = "REG"\n", 1693 n, fp->gpr[n], n+7, fp->gpr[n+7]); 1694 } 1695 #else 1696 for (n = 0; n < 32; ++n) { 1697 printf("R%.2d = %.8lx%s", n, fp->gpr[n], 1698 (n & 3) == 3? "\n": " "); 1699 if (n == 12 && !FULL_REGS(fp)) { 1700 printf("\n"); 1701 break; 1702 } 1703 } 1704 #endif 1705 printf("pc = "); 1706 xmon_print_symbol(fp->nip, " ", "\n"); 1707 if (TRAP(fp) != 0xc00 && cpu_has_feature(CPU_FTR_CFAR)) { 1708 printf("cfar= "); 1709 xmon_print_symbol(fp->orig_gpr3, " ", "\n"); 1710 } 1711 printf("lr = "); 1712 xmon_print_symbol(fp->link, " ", "\n"); 1713 printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr); 1714 printf("ctr = "REG" xer = "REG" trap = %4lx\n", 1715 fp->ctr, fp->xer, fp->trap); 1716 trap = TRAP(fp); 1717 if (trap == 0x300 || trap == 0x380 || trap == 0x600) 1718 printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr); 1719 } 1720 1721 static void cacheflush(void) 1722 { 1723 int cmd; 1724 unsigned long nflush; 1725 1726 cmd = inchar(); 1727 if (cmd != 'i') 1728 termch = cmd; 1729 scanhex((void *)&adrs); 1730 if (termch != '\n') 1731 termch = 0; 1732 nflush = 1; 1733 scanhex(&nflush); 1734 nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES; 1735 if (setjmp(bus_error_jmp) == 0) { 1736 catch_memory_errors = 1; 1737 sync(); 1738 1739 if (cmd != 'i') { 1740 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) 1741 cflush((void *) adrs); 1742 } else { 1743 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) 1744 cinval((void *) adrs); 1745 } 1746 sync(); 1747 /* wait a little while to see if we get a machine check */ 1748 __delay(200); 1749 } 1750 catch_memory_errors = 0; 1751 } 1752 1753 extern unsigned long xmon_mfspr(int spr, unsigned long default_value); 1754 extern void xmon_mtspr(int spr, unsigned long value); 1755 1756 static int 1757 read_spr(int n, unsigned long *vp) 1758 { 1759 unsigned long ret = -1UL; 1760 int ok = 0; 1761 1762 if (setjmp(bus_error_jmp) == 0) { 1763 catch_spr_faults = 1; 1764 sync(); 1765 1766 ret = xmon_mfspr(n, *vp); 1767 1768 sync(); 1769 *vp = ret; 1770 ok = 1; 1771 } 1772 catch_spr_faults = 0; 1773 1774 return ok; 1775 } 1776 1777 static void 1778 write_spr(int n, unsigned long val) 1779 { 1780 if (setjmp(bus_error_jmp) == 0) { 1781 catch_spr_faults = 1; 1782 sync(); 1783 1784 xmon_mtspr(n, val); 1785 1786 sync(); 1787 } else { 1788 printf("SPR 0x%03x (%4d) Faulted during write\n", n, n); 1789 } 1790 catch_spr_faults = 0; 1791 } 1792 1793 static void dump_206_sprs(void) 1794 { 1795 #ifdef CONFIG_PPC64 1796 if (!cpu_has_feature(CPU_FTR_ARCH_206)) 1797 return; 1798 1799 /* Actually some of these pre-date 2.06, but whatevs */ 1800 1801 printf("srr0 = %.16lx srr1 = %.16lx dsisr = %.8lx\n", 1802 mfspr(SPRN_SRR0), mfspr(SPRN_SRR1), mfspr(SPRN_DSISR)); 1803 printf("dscr = %.16lx ppr = %.16lx pir = %.8lx\n", 1804 mfspr(SPRN_DSCR), mfspr(SPRN_PPR), mfspr(SPRN_PIR)); 1805 printf("amr = %.16lx uamor = %.16lx\n", 1806 mfspr(SPRN_AMR), mfspr(SPRN_UAMOR)); 1807 1808 if (!(mfmsr() & MSR_HV)) 1809 return; 1810 1811 printf("sdr1 = %.16lx hdar = %.16lx hdsisr = %.8lx\n", 1812 mfspr(SPRN_SDR1), mfspr(SPRN_HDAR), mfspr(SPRN_HDSISR)); 1813 printf("hsrr0 = %.16lx hsrr1 = %.16lx hdec = %.16lx\n", 1814 mfspr(SPRN_HSRR0), mfspr(SPRN_HSRR1), mfspr(SPRN_HDEC)); 1815 printf("lpcr = %.16lx pcr = %.16lx lpidr = %.8lx\n", 1816 mfspr(SPRN_LPCR), mfspr(SPRN_PCR), mfspr(SPRN_LPID)); 1817 printf("hsprg0 = %.16lx hsprg1 = %.16lx amor = %.16lx\n", 1818 mfspr(SPRN_HSPRG0), mfspr(SPRN_HSPRG1), mfspr(SPRN_AMOR)); 1819 printf("dabr = %.16lx dabrx = %.16lx\n", 1820 mfspr(SPRN_DABR), mfspr(SPRN_DABRX)); 1821 #endif 1822 } 1823 1824 static void dump_207_sprs(void) 1825 { 1826 #ifdef CONFIG_PPC64 1827 unsigned long msr; 1828 1829 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 1830 return; 1831 1832 printf("dpdes = %.16lx tir = %.16lx cir = %.8lx\n", 1833 mfspr(SPRN_DPDES), mfspr(SPRN_TIR), mfspr(SPRN_CIR)); 1834 1835 printf("fscr = %.16lx tar = %.16lx pspb = %.8lx\n", 1836 mfspr(SPRN_FSCR), mfspr(SPRN_TAR), mfspr(SPRN_PSPB)); 1837 1838 msr = mfmsr(); 1839 if (msr & MSR_TM) { 1840 /* Only if TM has been enabled in the kernel */ 1841 printf("tfhar = %.16lx tfiar = %.16lx texasr = %.16lx\n", 1842 mfspr(SPRN_TFHAR), mfspr(SPRN_TFIAR), 1843 mfspr(SPRN_TEXASR)); 1844 } 1845 1846 printf("mmcr0 = %.16lx mmcr1 = %.16lx mmcr2 = %.16lx\n", 1847 mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCR2)); 1848 printf("pmc1 = %.8lx pmc2 = %.8lx pmc3 = %.8lx pmc4 = %.8lx\n", 1849 mfspr(SPRN_PMC1), mfspr(SPRN_PMC2), 1850 mfspr(SPRN_PMC3), mfspr(SPRN_PMC4)); 1851 printf("mmcra = %.16lx siar = %.16lx pmc5 = %.8lx\n", 1852 mfspr(SPRN_MMCRA), mfspr(SPRN_SIAR), mfspr(SPRN_PMC5)); 1853 printf("sdar = %.16lx sier = %.16lx pmc6 = %.8lx\n", 1854 mfspr(SPRN_SDAR), mfspr(SPRN_SIER), mfspr(SPRN_PMC6)); 1855 printf("ebbhr = %.16lx ebbrr = %.16lx bescr = %.16lx\n", 1856 mfspr(SPRN_EBBHR), mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR)); 1857 printf("iamr = %.16lx\n", mfspr(SPRN_IAMR)); 1858 1859 if (!(msr & MSR_HV)) 1860 return; 1861 1862 printf("hfscr = %.16lx dhdes = %.16lx rpr = %.16lx\n", 1863 mfspr(SPRN_HFSCR), mfspr(SPRN_DHDES), mfspr(SPRN_RPR)); 1864 printf("dawr = %.16lx dawrx = %.16lx ciabr = %.16lx\n", 1865 mfspr(SPRN_DAWR), mfspr(SPRN_DAWRX), mfspr(SPRN_CIABR)); 1866 #endif 1867 } 1868 1869 static void dump_300_sprs(void) 1870 { 1871 #ifdef CONFIG_PPC64 1872 bool hv = mfmsr() & MSR_HV; 1873 1874 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 1875 return; 1876 1877 printf("pidr = %.16lx tidr = %.16lx\n", 1878 mfspr(SPRN_PID), mfspr(SPRN_TIDR)); 1879 printf("asdr = %.16lx psscr = %.16lx\n", 1880 mfspr(SPRN_ASDR), hv ? mfspr(SPRN_PSSCR) 1881 : mfspr(SPRN_PSSCR_PR)); 1882 1883 if (!hv) 1884 return; 1885 1886 printf("ptcr = %.16lx\n", 1887 mfspr(SPRN_PTCR)); 1888 #endif 1889 } 1890 1891 static void dump_one_spr(int spr, bool show_unimplemented) 1892 { 1893 unsigned long val; 1894 1895 val = 0xdeadbeef; 1896 if (!read_spr(spr, &val)) { 1897 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr); 1898 return; 1899 } 1900 1901 if (val == 0xdeadbeef) { 1902 /* Looks like read was a nop, confirm */ 1903 val = 0x0badcafe; 1904 if (!read_spr(spr, &val)) { 1905 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr); 1906 return; 1907 } 1908 1909 if (val == 0x0badcafe) { 1910 if (show_unimplemented) 1911 printf("SPR 0x%03x (%4d) Unimplemented\n", spr, spr); 1912 return; 1913 } 1914 } 1915 1916 printf("SPR 0x%03x (%4d) = 0x%lx\n", spr, spr, val); 1917 } 1918 1919 static void super_regs(void) 1920 { 1921 static unsigned long regno; 1922 int cmd; 1923 int spr; 1924 1925 cmd = skipbl(); 1926 1927 switch (cmd) { 1928 case '\n': { 1929 unsigned long sp, toc; 1930 asm("mr %0,1" : "=r" (sp) :); 1931 asm("mr %0,2" : "=r" (toc) :); 1932 1933 printf("msr = "REG" sprg0 = "REG"\n", 1934 mfmsr(), mfspr(SPRN_SPRG0)); 1935 printf("pvr = "REG" sprg1 = "REG"\n", 1936 mfspr(SPRN_PVR), mfspr(SPRN_SPRG1)); 1937 printf("dec = "REG" sprg2 = "REG"\n", 1938 mfspr(SPRN_DEC), mfspr(SPRN_SPRG2)); 1939 printf("sp = "REG" sprg3 = "REG"\n", sp, mfspr(SPRN_SPRG3)); 1940 printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR)); 1941 1942 dump_206_sprs(); 1943 dump_207_sprs(); 1944 dump_300_sprs(); 1945 1946 return; 1947 } 1948 case 'w': { 1949 unsigned long val; 1950 scanhex(®no); 1951 val = 0; 1952 read_spr(regno, &val); 1953 scanhex(&val); 1954 write_spr(regno, val); 1955 dump_one_spr(regno, true); 1956 break; 1957 } 1958 case 'r': 1959 scanhex(®no); 1960 dump_one_spr(regno, true); 1961 break; 1962 case 'a': 1963 /* dump ALL SPRs */ 1964 for (spr = 1; spr < 1024; ++spr) 1965 dump_one_spr(spr, false); 1966 break; 1967 } 1968 1969 scannl(); 1970 } 1971 1972 /* 1973 * Stuff for reading and writing memory safely 1974 */ 1975 static int 1976 mread(unsigned long adrs, void *buf, int size) 1977 { 1978 volatile int n; 1979 char *p, *q; 1980 1981 n = 0; 1982 if (setjmp(bus_error_jmp) == 0) { 1983 catch_memory_errors = 1; 1984 sync(); 1985 p = (char *)adrs; 1986 q = (char *)buf; 1987 switch (size) { 1988 case 2: 1989 *(u16 *)q = *(u16 *)p; 1990 break; 1991 case 4: 1992 *(u32 *)q = *(u32 *)p; 1993 break; 1994 case 8: 1995 *(u64 *)q = *(u64 *)p; 1996 break; 1997 default: 1998 for( ; n < size; ++n) { 1999 *q++ = *p++; 2000 sync(); 2001 } 2002 } 2003 sync(); 2004 /* wait a little while to see if we get a machine check */ 2005 __delay(200); 2006 n = size; 2007 } 2008 catch_memory_errors = 0; 2009 return n; 2010 } 2011 2012 static int 2013 mwrite(unsigned long adrs, void *buf, int size) 2014 { 2015 volatile int n; 2016 char *p, *q; 2017 2018 n = 0; 2019 if (setjmp(bus_error_jmp) == 0) { 2020 catch_memory_errors = 1; 2021 sync(); 2022 p = (char *) adrs; 2023 q = (char *) buf; 2024 switch (size) { 2025 case 2: 2026 *(u16 *)p = *(u16 *)q; 2027 break; 2028 case 4: 2029 *(u32 *)p = *(u32 *)q; 2030 break; 2031 case 8: 2032 *(u64 *)p = *(u64 *)q; 2033 break; 2034 default: 2035 for ( ; n < size; ++n) { 2036 *p++ = *q++; 2037 sync(); 2038 } 2039 } 2040 sync(); 2041 /* wait a little while to see if we get a machine check */ 2042 __delay(200); 2043 n = size; 2044 } else { 2045 printf("*** Error writing address "REG"\n", adrs + n); 2046 } 2047 catch_memory_errors = 0; 2048 return n; 2049 } 2050 2051 static int fault_type; 2052 static int fault_except; 2053 static char *fault_chars[] = { "--", "**", "##" }; 2054 2055 static int handle_fault(struct pt_regs *regs) 2056 { 2057 fault_except = TRAP(regs); 2058 switch (TRAP(regs)) { 2059 case 0x200: 2060 fault_type = 0; 2061 break; 2062 case 0x300: 2063 case 0x380: 2064 fault_type = 1; 2065 break; 2066 default: 2067 fault_type = 2; 2068 } 2069 2070 longjmp(bus_error_jmp, 1); 2071 2072 return 0; 2073 } 2074 2075 #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t)) 2076 2077 static void 2078 byterev(unsigned char *val, int size) 2079 { 2080 int t; 2081 2082 switch (size) { 2083 case 2: 2084 SWAP(val[0], val[1], t); 2085 break; 2086 case 4: 2087 SWAP(val[0], val[3], t); 2088 SWAP(val[1], val[2], t); 2089 break; 2090 case 8: /* is there really any use for this? */ 2091 SWAP(val[0], val[7], t); 2092 SWAP(val[1], val[6], t); 2093 SWAP(val[2], val[5], t); 2094 SWAP(val[3], val[4], t); 2095 break; 2096 } 2097 } 2098 2099 static int brev; 2100 static int mnoread; 2101 2102 static char *memex_help_string = 2103 "Memory examine command usage:\n" 2104 "m [addr] [flags] examine/change memory\n" 2105 " addr is optional. will start where left off.\n" 2106 " flags may include chars from this set:\n" 2107 " b modify by bytes (default)\n" 2108 " w modify by words (2 byte)\n" 2109 " l modify by longs (4 byte)\n" 2110 " d modify by doubleword (8 byte)\n" 2111 " r toggle reverse byte order mode\n" 2112 " n do not read memory (for i/o spaces)\n" 2113 " . ok to read (default)\n" 2114 "NOTE: flags are saved as defaults\n" 2115 ""; 2116 2117 static char *memex_subcmd_help_string = 2118 "Memory examine subcommands:\n" 2119 " hexval write this val to current location\n" 2120 " 'string' write chars from string to this location\n" 2121 " ' increment address\n" 2122 " ^ decrement address\n" 2123 " / increment addr by 0x10. //=0x100, ///=0x1000, etc\n" 2124 " \\ decrement addr by 0x10. \\\\=0x100, \\\\\\=0x1000, etc\n" 2125 " ` clear no-read flag\n" 2126 " ; stay at this addr\n" 2127 " v change to byte mode\n" 2128 " w change to word (2 byte) mode\n" 2129 " l change to long (4 byte) mode\n" 2130 " u change to doubleword (8 byte) mode\n" 2131 " m addr change current addr\n" 2132 " n toggle no-read flag\n" 2133 " r toggle byte reverse flag\n" 2134 " < count back up count bytes\n" 2135 " > count skip forward count bytes\n" 2136 " x exit this mode\n" 2137 ""; 2138 2139 static void 2140 memex(void) 2141 { 2142 int cmd, inc, i, nslash; 2143 unsigned long n; 2144 unsigned char val[16]; 2145 2146 scanhex((void *)&adrs); 2147 cmd = skipbl(); 2148 if (cmd == '?') { 2149 printf(memex_help_string); 2150 return; 2151 } else { 2152 termch = cmd; 2153 } 2154 last_cmd = "m\n"; 2155 while ((cmd = skipbl()) != '\n') { 2156 switch( cmd ){ 2157 case 'b': size = 1; break; 2158 case 'w': size = 2; break; 2159 case 'l': size = 4; break; 2160 case 'd': size = 8; break; 2161 case 'r': brev = !brev; break; 2162 case 'n': mnoread = 1; break; 2163 case '.': mnoread = 0; break; 2164 } 2165 } 2166 if( size <= 0 ) 2167 size = 1; 2168 else if( size > 8 ) 2169 size = 8; 2170 for(;;){ 2171 if (!mnoread) 2172 n = mread(adrs, val, size); 2173 printf(REG"%c", adrs, brev? 'r': ' '); 2174 if (!mnoread) { 2175 if (brev) 2176 byterev(val, size); 2177 putchar(' '); 2178 for (i = 0; i < n; ++i) 2179 printf("%.2x", val[i]); 2180 for (; i < size; ++i) 2181 printf("%s", fault_chars[fault_type]); 2182 } 2183 putchar(' '); 2184 inc = size; 2185 nslash = 0; 2186 for(;;){ 2187 if( scanhex(&n) ){ 2188 for (i = 0; i < size; ++i) 2189 val[i] = n >> (i * 8); 2190 if (!brev) 2191 byterev(val, size); 2192 mwrite(adrs, val, size); 2193 inc = size; 2194 } 2195 cmd = skipbl(); 2196 if (cmd == '\n') 2197 break; 2198 inc = 0; 2199 switch (cmd) { 2200 case '\'': 2201 for(;;){ 2202 n = inchar(); 2203 if( n == '\\' ) 2204 n = bsesc(); 2205 else if( n == '\'' ) 2206 break; 2207 for (i = 0; i < size; ++i) 2208 val[i] = n >> (i * 8); 2209 if (!brev) 2210 byterev(val, size); 2211 mwrite(adrs, val, size); 2212 adrs += size; 2213 } 2214 adrs -= size; 2215 inc = size; 2216 break; 2217 case ',': 2218 adrs += size; 2219 break; 2220 case '.': 2221 mnoread = 0; 2222 break; 2223 case ';': 2224 break; 2225 case 'x': 2226 case EOF: 2227 scannl(); 2228 return; 2229 case 'b': 2230 case 'v': 2231 size = 1; 2232 break; 2233 case 'w': 2234 size = 2; 2235 break; 2236 case 'l': 2237 size = 4; 2238 break; 2239 case 'u': 2240 size = 8; 2241 break; 2242 case '^': 2243 adrs -= size; 2244 break; 2245 case '/': 2246 if (nslash > 0) 2247 adrs -= 1 << nslash; 2248 else 2249 nslash = 0; 2250 nslash += 4; 2251 adrs += 1 << nslash; 2252 break; 2253 case '\\': 2254 if (nslash < 0) 2255 adrs += 1 << -nslash; 2256 else 2257 nslash = 0; 2258 nslash -= 4; 2259 adrs -= 1 << -nslash; 2260 break; 2261 case 'm': 2262 scanhex((void *)&adrs); 2263 break; 2264 case 'n': 2265 mnoread = 1; 2266 break; 2267 case 'r': 2268 brev = !brev; 2269 break; 2270 case '<': 2271 n = size; 2272 scanhex(&n); 2273 adrs -= n; 2274 break; 2275 case '>': 2276 n = size; 2277 scanhex(&n); 2278 adrs += n; 2279 break; 2280 case '?': 2281 printf(memex_subcmd_help_string); 2282 break; 2283 } 2284 } 2285 adrs += inc; 2286 } 2287 } 2288 2289 static int 2290 bsesc(void) 2291 { 2292 int c; 2293 2294 c = inchar(); 2295 switch( c ){ 2296 case 'n': c = '\n'; break; 2297 case 'r': c = '\r'; break; 2298 case 'b': c = '\b'; break; 2299 case 't': c = '\t'; break; 2300 } 2301 return c; 2302 } 2303 2304 static void xmon_rawdump (unsigned long adrs, long ndump) 2305 { 2306 long n, m, r, nr; 2307 unsigned char temp[16]; 2308 2309 for (n = ndump; n > 0;) { 2310 r = n < 16? n: 16; 2311 nr = mread(adrs, temp, r); 2312 adrs += nr; 2313 for (m = 0; m < r; ++m) { 2314 if (m < nr) 2315 printf("%.2x", temp[m]); 2316 else 2317 printf("%s", fault_chars[fault_type]); 2318 } 2319 n -= r; 2320 if (nr < r) 2321 break; 2322 } 2323 printf("\n"); 2324 } 2325 2326 static void dump_tracing(void) 2327 { 2328 int c; 2329 2330 c = inchar(); 2331 if (c == 'c') 2332 ftrace_dump(DUMP_ORIG); 2333 else 2334 ftrace_dump(DUMP_ALL); 2335 } 2336 2337 #ifdef CONFIG_PPC64 2338 static void dump_one_paca(int cpu) 2339 { 2340 struct paca_struct *p; 2341 #ifdef CONFIG_PPC_BOOK3S_64 2342 int i = 0; 2343 #endif 2344 2345 if (setjmp(bus_error_jmp) != 0) { 2346 printf("*** Error dumping paca for cpu 0x%x!\n", cpu); 2347 return; 2348 } 2349 2350 catch_memory_errors = 1; 2351 sync(); 2352 2353 p = paca_ptrs[cpu]; 2354 2355 printf("paca for cpu 0x%x @ %px:\n", cpu, p); 2356 2357 printf(" %-*s = %s\n", 25, "possible", cpu_possible(cpu) ? "yes" : "no"); 2358 printf(" %-*s = %s\n", 25, "present", cpu_present(cpu) ? "yes" : "no"); 2359 printf(" %-*s = %s\n", 25, "online", cpu_online(cpu) ? "yes" : "no"); 2360 2361 #define DUMP(paca, name, format) \ 2362 printf(" %-*s = "format"\t(0x%lx)\n", 25, #name, 18, paca->name, \ 2363 offsetof(struct paca_struct, name)); 2364 2365 DUMP(p, lock_token, "%#-*x"); 2366 DUMP(p, paca_index, "%#-*x"); 2367 DUMP(p, kernel_toc, "%#-*llx"); 2368 DUMP(p, kernelbase, "%#-*llx"); 2369 DUMP(p, kernel_msr, "%#-*llx"); 2370 DUMP(p, emergency_sp, "%-*px"); 2371 #ifdef CONFIG_PPC_BOOK3S_64 2372 DUMP(p, nmi_emergency_sp, "%-*px"); 2373 DUMP(p, mc_emergency_sp, "%-*px"); 2374 DUMP(p, in_nmi, "%#-*x"); 2375 DUMP(p, in_mce, "%#-*x"); 2376 DUMP(p, hmi_event_available, "%#-*x"); 2377 #endif 2378 DUMP(p, data_offset, "%#-*llx"); 2379 DUMP(p, hw_cpu_id, "%#-*x"); 2380 DUMP(p, cpu_start, "%#-*x"); 2381 DUMP(p, kexec_state, "%#-*x"); 2382 #ifdef CONFIG_PPC_BOOK3S_64 2383 if (!early_radix_enabled()) { 2384 for (i = 0; i < SLB_NUM_BOLTED; i++) { 2385 u64 esid, vsid; 2386 2387 if (!p->slb_shadow_ptr) 2388 continue; 2389 2390 esid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].esid); 2391 vsid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].vsid); 2392 2393 if (esid || vsid) { 2394 printf(" %-*s[%d] = 0x%016llx 0x%016llx\n", 2395 22, "slb_shadow", i, esid, vsid); 2396 } 2397 } 2398 DUMP(p, vmalloc_sllp, "%#-*x"); 2399 DUMP(p, stab_rr, "%#-*x"); 2400 DUMP(p, slb_used_bitmap, "%#-*x"); 2401 DUMP(p, slb_kern_bitmap, "%#-*x"); 2402 2403 if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { 2404 DUMP(p, slb_cache_ptr, "%#-*x"); 2405 for (i = 0; i < SLB_CACHE_ENTRIES; i++) 2406 printf(" %-*s[%d] = 0x%016x\n", 2407 22, "slb_cache", i, p->slb_cache[i]); 2408 } 2409 } 2410 2411 DUMP(p, rfi_flush_fallback_area, "%-*px"); 2412 #endif 2413 DUMP(p, dscr_default, "%#-*llx"); 2414 #ifdef CONFIG_PPC_BOOK3E 2415 DUMP(p, pgd, "%-*px"); 2416 DUMP(p, kernel_pgd, "%-*px"); 2417 DUMP(p, tcd_ptr, "%-*px"); 2418 DUMP(p, mc_kstack, "%-*px"); 2419 DUMP(p, crit_kstack, "%-*px"); 2420 DUMP(p, dbg_kstack, "%-*px"); 2421 #endif 2422 DUMP(p, __current, "%-*px"); 2423 DUMP(p, kstack, "%#-*llx"); 2424 printf(" %-*s = 0x%016llx\n", 25, "kstack_base", p->kstack & ~(THREAD_SIZE - 1)); 2425 #ifdef CONFIG_STACKPROTECTOR 2426 DUMP(p, canary, "%#-*lx"); 2427 #endif 2428 DUMP(p, saved_r1, "%#-*llx"); 2429 DUMP(p, trap_save, "%#-*x"); 2430 DUMP(p, irq_soft_mask, "%#-*x"); 2431 DUMP(p, irq_happened, "%#-*x"); 2432 DUMP(p, io_sync, "%#-*x"); 2433 DUMP(p, irq_work_pending, "%#-*x"); 2434 DUMP(p, nap_state_lost, "%#-*x"); 2435 DUMP(p, sprg_vdso, "%#-*llx"); 2436 2437 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2438 DUMP(p, tm_scratch, "%#-*llx"); 2439 #endif 2440 2441 #ifdef CONFIG_PPC_POWERNV 2442 DUMP(p, core_idle_state_ptr, "%-*px"); 2443 DUMP(p, thread_idle_state, "%#-*x"); 2444 DUMP(p, thread_mask, "%#-*x"); 2445 DUMP(p, subcore_sibling_mask, "%#-*x"); 2446 DUMP(p, requested_psscr, "%#-*llx"); 2447 DUMP(p, stop_sprs.pid, "%#-*llx"); 2448 DUMP(p, stop_sprs.ldbar, "%#-*llx"); 2449 DUMP(p, stop_sprs.fscr, "%#-*llx"); 2450 DUMP(p, stop_sprs.hfscr, "%#-*llx"); 2451 DUMP(p, stop_sprs.mmcr1, "%#-*llx"); 2452 DUMP(p, stop_sprs.mmcr2, "%#-*llx"); 2453 DUMP(p, stop_sprs.mmcra, "%#-*llx"); 2454 DUMP(p, dont_stop.counter, "%#-*x"); 2455 #endif 2456 2457 DUMP(p, accounting.utime, "%#-*lx"); 2458 DUMP(p, accounting.stime, "%#-*lx"); 2459 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME 2460 DUMP(p, accounting.utime_scaled, "%#-*lx"); 2461 #endif 2462 DUMP(p, accounting.starttime, "%#-*lx"); 2463 DUMP(p, accounting.starttime_user, "%#-*lx"); 2464 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME 2465 DUMP(p, accounting.startspurr, "%#-*lx"); 2466 DUMP(p, accounting.utime_sspurr, "%#-*lx"); 2467 #endif 2468 DUMP(p, accounting.steal_time, "%#-*lx"); 2469 #undef DUMP 2470 2471 catch_memory_errors = 0; 2472 sync(); 2473 } 2474 2475 static void dump_all_pacas(void) 2476 { 2477 int cpu; 2478 2479 if (num_possible_cpus() == 0) { 2480 printf("No possible cpus, use 'dp #' to dump individual cpus\n"); 2481 return; 2482 } 2483 2484 for_each_possible_cpu(cpu) 2485 dump_one_paca(cpu); 2486 } 2487 2488 static void dump_pacas(void) 2489 { 2490 unsigned long num; 2491 int c; 2492 2493 c = inchar(); 2494 if (c == 'a') { 2495 dump_all_pacas(); 2496 return; 2497 } 2498 2499 termch = c; /* Put c back, it wasn't 'a' */ 2500 2501 if (scanhex(&num)) 2502 dump_one_paca(num); 2503 else 2504 dump_one_paca(xmon_owner); 2505 } 2506 #endif 2507 2508 #ifdef CONFIG_PPC_POWERNV 2509 static void dump_one_xive(int cpu) 2510 { 2511 unsigned int hwid = get_hard_smp_processor_id(cpu); 2512 2513 opal_xive_dump(XIVE_DUMP_TM_HYP, hwid); 2514 opal_xive_dump(XIVE_DUMP_TM_POOL, hwid); 2515 opal_xive_dump(XIVE_DUMP_TM_OS, hwid); 2516 opal_xive_dump(XIVE_DUMP_TM_USER, hwid); 2517 opal_xive_dump(XIVE_DUMP_VP, hwid); 2518 opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid); 2519 2520 if (setjmp(bus_error_jmp) != 0) { 2521 catch_memory_errors = 0; 2522 printf("*** Error dumping xive on cpu %d\n", cpu); 2523 return; 2524 } 2525 2526 catch_memory_errors = 1; 2527 sync(); 2528 xmon_xive_do_dump(cpu); 2529 sync(); 2530 __delay(200); 2531 catch_memory_errors = 0; 2532 } 2533 2534 static void dump_all_xives(void) 2535 { 2536 int cpu; 2537 2538 if (num_possible_cpus() == 0) { 2539 printf("No possible cpus, use 'dx #' to dump individual cpus\n"); 2540 return; 2541 } 2542 2543 for_each_possible_cpu(cpu) 2544 dump_one_xive(cpu); 2545 } 2546 2547 static void dump_one_xive_irq(u32 num) 2548 { 2549 s64 rc; 2550 __be64 vp; 2551 u8 prio; 2552 __be32 lirq; 2553 2554 rc = opal_xive_get_irq_config(num, &vp, &prio, &lirq); 2555 xmon_printf("IRQ 0x%x config: vp=0x%llx prio=%d lirq=0x%x (rc=%lld)\n", 2556 num, be64_to_cpu(vp), prio, be32_to_cpu(lirq), rc); 2557 } 2558 2559 static void dump_xives(void) 2560 { 2561 unsigned long num; 2562 int c; 2563 2564 if (!xive_enabled()) { 2565 printf("Xive disabled on this system\n"); 2566 return; 2567 } 2568 2569 c = inchar(); 2570 if (c == 'a') { 2571 dump_all_xives(); 2572 return; 2573 } else if (c == 'i') { 2574 if (scanhex(&num)) 2575 dump_one_xive_irq(num); 2576 return; 2577 } 2578 2579 termch = c; /* Put c back, it wasn't 'a' */ 2580 2581 if (scanhex(&num)) 2582 dump_one_xive(num); 2583 else 2584 dump_one_xive(xmon_owner); 2585 } 2586 #endif /* CONFIG_PPC_POWERNV */ 2587 2588 static void dump_by_size(unsigned long addr, long count, int size) 2589 { 2590 unsigned char temp[16]; 2591 int i, j; 2592 u64 val; 2593 2594 count = ALIGN(count, 16); 2595 2596 for (i = 0; i < count; i += 16, addr += 16) { 2597 printf(REG, addr); 2598 2599 if (mread(addr, temp, 16) != 16) { 2600 printf("\nFaulted reading %d bytes from 0x"REG"\n", 16, addr); 2601 return; 2602 } 2603 2604 for (j = 0; j < 16; j += size) { 2605 putchar(' '); 2606 switch (size) { 2607 case 1: val = temp[j]; break; 2608 case 2: val = *(u16 *)&temp[j]; break; 2609 case 4: val = *(u32 *)&temp[j]; break; 2610 case 8: val = *(u64 *)&temp[j]; break; 2611 default: val = 0; 2612 } 2613 2614 printf("%0*llx", size * 2, val); 2615 } 2616 printf("\n"); 2617 } 2618 } 2619 2620 static void 2621 dump(void) 2622 { 2623 static char last[] = { "d?\n" }; 2624 int c; 2625 2626 c = inchar(); 2627 2628 #ifdef CONFIG_PPC64 2629 if (c == 'p') { 2630 xmon_start_pagination(); 2631 dump_pacas(); 2632 xmon_end_pagination(); 2633 return; 2634 } 2635 #endif 2636 #ifdef CONFIG_PPC_POWERNV 2637 if (c == 'x') { 2638 xmon_start_pagination(); 2639 dump_xives(); 2640 xmon_end_pagination(); 2641 return; 2642 } 2643 #endif 2644 2645 if (c == 't') { 2646 dump_tracing(); 2647 return; 2648 } 2649 2650 if (c == '\n') 2651 termch = c; 2652 2653 scanhex((void *)&adrs); 2654 if (termch != '\n') 2655 termch = 0; 2656 if (c == 'i') { 2657 scanhex(&nidump); 2658 if (nidump == 0) 2659 nidump = 16; 2660 else if (nidump > MAX_DUMP) 2661 nidump = MAX_DUMP; 2662 adrs += ppc_inst_dump(adrs, nidump, 1); 2663 last_cmd = "di\n"; 2664 } else if (c == 'l') { 2665 dump_log_buf(); 2666 } else if (c == 'o') { 2667 dump_opal_msglog(); 2668 } else if (c == 'v') { 2669 /* dump virtual to physical translation */ 2670 show_pte(adrs); 2671 } else if (c == 'r') { 2672 scanhex(&ndump); 2673 if (ndump == 0) 2674 ndump = 64; 2675 xmon_rawdump(adrs, ndump); 2676 adrs += ndump; 2677 last_cmd = "dr\n"; 2678 } else { 2679 scanhex(&ndump); 2680 if (ndump == 0) 2681 ndump = 64; 2682 else if (ndump > MAX_DUMP) 2683 ndump = MAX_DUMP; 2684 2685 switch (c) { 2686 case '8': 2687 case '4': 2688 case '2': 2689 case '1': 2690 ndump = ALIGN(ndump, 16); 2691 dump_by_size(adrs, ndump, c - '0'); 2692 last[1] = c; 2693 last_cmd = last; 2694 break; 2695 default: 2696 prdump(adrs, ndump); 2697 last_cmd = "d\n"; 2698 } 2699 2700 adrs += ndump; 2701 } 2702 } 2703 2704 static void 2705 prdump(unsigned long adrs, long ndump) 2706 { 2707 long n, m, c, r, nr; 2708 unsigned char temp[16]; 2709 2710 for (n = ndump; n > 0;) { 2711 printf(REG, adrs); 2712 putchar(' '); 2713 r = n < 16? n: 16; 2714 nr = mread(adrs, temp, r); 2715 adrs += nr; 2716 for (m = 0; m < r; ++m) { 2717 if ((m & (sizeof(long) - 1)) == 0 && m > 0) 2718 putchar(' '); 2719 if (m < nr) 2720 printf("%.2x", temp[m]); 2721 else 2722 printf("%s", fault_chars[fault_type]); 2723 } 2724 for (; m < 16; ++m) { 2725 if ((m & (sizeof(long) - 1)) == 0) 2726 putchar(' '); 2727 printf(" "); 2728 } 2729 printf(" |"); 2730 for (m = 0; m < r; ++m) { 2731 if (m < nr) { 2732 c = temp[m]; 2733 putchar(' ' <= c && c <= '~'? c: '.'); 2734 } else 2735 putchar(' '); 2736 } 2737 n -= r; 2738 for (; m < 16; ++m) 2739 putchar(' '); 2740 printf("|\n"); 2741 if (nr < r) 2742 break; 2743 } 2744 } 2745 2746 typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr); 2747 2748 static int 2749 generic_inst_dump(unsigned long adr, long count, int praddr, 2750 instruction_dump_func dump_func) 2751 { 2752 int nr, dotted; 2753 unsigned long first_adr; 2754 unsigned int inst, last_inst = 0; 2755 unsigned char val[4]; 2756 2757 dotted = 0; 2758 for (first_adr = adr; count > 0; --count, adr += 4) { 2759 nr = mread(adr, val, 4); 2760 if (nr == 0) { 2761 if (praddr) { 2762 const char *x = fault_chars[fault_type]; 2763 printf(REG" %s%s%s%s\n", adr, x, x, x, x); 2764 } 2765 break; 2766 } 2767 inst = GETWORD(val); 2768 if (adr > first_adr && inst == last_inst) { 2769 if (!dotted) { 2770 printf(" ...\n"); 2771 dotted = 1; 2772 } 2773 continue; 2774 } 2775 dotted = 0; 2776 last_inst = inst; 2777 if (praddr) 2778 printf(REG" %.8x", adr, inst); 2779 printf("\t"); 2780 dump_func(inst, adr); 2781 printf("\n"); 2782 } 2783 return adr - first_adr; 2784 } 2785 2786 static int 2787 ppc_inst_dump(unsigned long adr, long count, int praddr) 2788 { 2789 return generic_inst_dump(adr, count, praddr, print_insn_powerpc); 2790 } 2791 2792 void 2793 print_address(unsigned long addr) 2794 { 2795 xmon_print_symbol(addr, "\t# ", ""); 2796 } 2797 2798 static void 2799 dump_log_buf(void) 2800 { 2801 struct kmsg_dumper dumper = { .active = 1 }; 2802 unsigned char buf[128]; 2803 size_t len; 2804 2805 if (setjmp(bus_error_jmp) != 0) { 2806 printf("Error dumping printk buffer!\n"); 2807 return; 2808 } 2809 2810 catch_memory_errors = 1; 2811 sync(); 2812 2813 kmsg_dump_rewind_nolock(&dumper); 2814 xmon_start_pagination(); 2815 while (kmsg_dump_get_line_nolock(&dumper, false, buf, sizeof(buf), &len)) { 2816 buf[len] = '\0'; 2817 printf("%s", buf); 2818 } 2819 xmon_end_pagination(); 2820 2821 sync(); 2822 /* wait a little while to see if we get a machine check */ 2823 __delay(200); 2824 catch_memory_errors = 0; 2825 } 2826 2827 #ifdef CONFIG_PPC_POWERNV 2828 static void dump_opal_msglog(void) 2829 { 2830 unsigned char buf[128]; 2831 ssize_t res; 2832 loff_t pos = 0; 2833 2834 if (!firmware_has_feature(FW_FEATURE_OPAL)) { 2835 printf("Machine is not running OPAL firmware.\n"); 2836 return; 2837 } 2838 2839 if (setjmp(bus_error_jmp) != 0) { 2840 printf("Error dumping OPAL msglog!\n"); 2841 return; 2842 } 2843 2844 catch_memory_errors = 1; 2845 sync(); 2846 2847 xmon_start_pagination(); 2848 while ((res = opal_msglog_copy(buf, pos, sizeof(buf) - 1))) { 2849 if (res < 0) { 2850 printf("Error dumping OPAL msglog! Error: %zd\n", res); 2851 break; 2852 } 2853 buf[res] = '\0'; 2854 printf("%s", buf); 2855 pos += res; 2856 } 2857 xmon_end_pagination(); 2858 2859 sync(); 2860 /* wait a little while to see if we get a machine check */ 2861 __delay(200); 2862 catch_memory_errors = 0; 2863 } 2864 #endif 2865 2866 /* 2867 * Memory operations - move, set, print differences 2868 */ 2869 static unsigned long mdest; /* destination address */ 2870 static unsigned long msrc; /* source address */ 2871 static unsigned long mval; /* byte value to set memory to */ 2872 static unsigned long mcount; /* # bytes to affect */ 2873 static unsigned long mdiffs; /* max # differences to print */ 2874 2875 static void 2876 memops(int cmd) 2877 { 2878 scanhex((void *)&mdest); 2879 if( termch != '\n' ) 2880 termch = 0; 2881 scanhex((void *)(cmd == 's'? &mval: &msrc)); 2882 if( termch != '\n' ) 2883 termch = 0; 2884 scanhex((void *)&mcount); 2885 switch( cmd ){ 2886 case 'm': 2887 memmove((void *)mdest, (void *)msrc, mcount); 2888 break; 2889 case 's': 2890 memset((void *)mdest, mval, mcount); 2891 break; 2892 case 'd': 2893 if( termch != '\n' ) 2894 termch = 0; 2895 scanhex((void *)&mdiffs); 2896 memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs); 2897 break; 2898 } 2899 } 2900 2901 static void 2902 memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr) 2903 { 2904 unsigned n, prt; 2905 2906 prt = 0; 2907 for( n = nb; n > 0; --n ) 2908 if( *p1++ != *p2++ ) 2909 if( ++prt <= maxpr ) 2910 printf("%px %.2x # %px %.2x\n", p1 - 1, 2911 p1[-1], p2 - 1, p2[-1]); 2912 if( prt > maxpr ) 2913 printf("Total of %d differences\n", prt); 2914 } 2915 2916 static unsigned mend; 2917 static unsigned mask; 2918 2919 static void 2920 memlocate(void) 2921 { 2922 unsigned a, n; 2923 unsigned char val[4]; 2924 2925 last_cmd = "ml"; 2926 scanhex((void *)&mdest); 2927 if (termch != '\n') { 2928 termch = 0; 2929 scanhex((void *)&mend); 2930 if (termch != '\n') { 2931 termch = 0; 2932 scanhex((void *)&mval); 2933 mask = ~0; 2934 if (termch != '\n') termch = 0; 2935 scanhex((void *)&mask); 2936 } 2937 } 2938 n = 0; 2939 for (a = mdest; a < mend; a += 4) { 2940 if (mread(a, val, 4) == 4 2941 && ((GETWORD(val) ^ mval) & mask) == 0) { 2942 printf("%.16x: %.16x\n", a, GETWORD(val)); 2943 if (++n >= 10) 2944 break; 2945 } 2946 } 2947 } 2948 2949 static unsigned long mskip = 0x1000; 2950 static unsigned long mlim = 0xffffffff; 2951 2952 static void 2953 memzcan(void) 2954 { 2955 unsigned char v; 2956 unsigned a; 2957 int ok, ook; 2958 2959 scanhex(&mdest); 2960 if (termch != '\n') termch = 0; 2961 scanhex(&mskip); 2962 if (termch != '\n') termch = 0; 2963 scanhex(&mlim); 2964 ook = 0; 2965 for (a = mdest; a < mlim; a += mskip) { 2966 ok = mread(a, &v, 1); 2967 if (ok && !ook) { 2968 printf("%.8x .. ", a); 2969 } else if (!ok && ook) 2970 printf("%.8lx\n", a - mskip); 2971 ook = ok; 2972 if (a + mskip < a) 2973 break; 2974 } 2975 if (ook) 2976 printf("%.8lx\n", a - mskip); 2977 } 2978 2979 static void show_task(struct task_struct *tsk) 2980 { 2981 char state; 2982 2983 /* 2984 * Cloned from kdb_task_state_char(), which is not entirely 2985 * appropriate for calling from xmon. This could be moved 2986 * to a common, generic, routine used by both. 2987 */ 2988 state = (tsk->state == 0) ? 'R' : 2989 (tsk->state < 0) ? 'U' : 2990 (tsk->state & TASK_UNINTERRUPTIBLE) ? 'D' : 2991 (tsk->state & TASK_STOPPED) ? 'T' : 2992 (tsk->state & TASK_TRACED) ? 'C' : 2993 (tsk->exit_state & EXIT_ZOMBIE) ? 'Z' : 2994 (tsk->exit_state & EXIT_DEAD) ? 'E' : 2995 (tsk->state & TASK_INTERRUPTIBLE) ? 'S' : '?'; 2996 2997 printf("%px %016lx %6d %6d %c %2d %s\n", tsk, 2998 tsk->thread.ksp, 2999 tsk->pid, rcu_dereference(tsk->parent)->pid, 3000 state, task_cpu(tsk), 3001 tsk->comm); 3002 } 3003 3004 #ifdef CONFIG_PPC_BOOK3S_64 3005 static void format_pte(void *ptep, unsigned long pte) 3006 { 3007 pte_t entry = __pte(pte); 3008 3009 printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte); 3010 printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK); 3011 3012 printf("Flags = %s%s%s%s%s\n", 3013 pte_young(entry) ? "Accessed " : "", 3014 pte_dirty(entry) ? "Dirty " : "", 3015 pte_read(entry) ? "Read " : "", 3016 pte_write(entry) ? "Write " : "", 3017 pte_exec(entry) ? "Exec " : ""); 3018 } 3019 3020 static void show_pte(unsigned long addr) 3021 { 3022 unsigned long tskv = 0; 3023 struct task_struct *tsk = NULL; 3024 struct mm_struct *mm; 3025 pgd_t *pgdp, *pgdir; 3026 pud_t *pudp; 3027 pmd_t *pmdp; 3028 pte_t *ptep; 3029 3030 if (!scanhex(&tskv)) 3031 mm = &init_mm; 3032 else 3033 tsk = (struct task_struct *)tskv; 3034 3035 if (tsk == NULL) 3036 mm = &init_mm; 3037 else 3038 mm = tsk->active_mm; 3039 3040 if (setjmp(bus_error_jmp) != 0) { 3041 catch_memory_errors = 0; 3042 printf("*** Error dumping pte for task %px\n", tsk); 3043 return; 3044 } 3045 3046 catch_memory_errors = 1; 3047 sync(); 3048 3049 if (mm == &init_mm) { 3050 pgdp = pgd_offset_k(addr); 3051 pgdir = pgd_offset_k(0); 3052 } else { 3053 pgdp = pgd_offset(mm, addr); 3054 pgdir = pgd_offset(mm, 0); 3055 } 3056 3057 if (pgd_none(*pgdp)) { 3058 printf("no linux page table for address\n"); 3059 return; 3060 } 3061 3062 printf("pgd @ 0x%px\n", pgdir); 3063 3064 if (pgd_huge(*pgdp)) { 3065 format_pte(pgdp, pgd_val(*pgdp)); 3066 return; 3067 } 3068 printf("pgdp @ 0x%px = 0x%016lx\n", pgdp, pgd_val(*pgdp)); 3069 3070 pudp = pud_offset(pgdp, addr); 3071 3072 if (pud_none(*pudp)) { 3073 printf("No valid PUD\n"); 3074 return; 3075 } 3076 3077 if (pud_huge(*pudp)) { 3078 format_pte(pudp, pud_val(*pudp)); 3079 return; 3080 } 3081 3082 printf("pudp @ 0x%px = 0x%016lx\n", pudp, pud_val(*pudp)); 3083 3084 pmdp = pmd_offset(pudp, addr); 3085 3086 if (pmd_none(*pmdp)) { 3087 printf("No valid PMD\n"); 3088 return; 3089 } 3090 3091 if (pmd_huge(*pmdp)) { 3092 format_pte(pmdp, pmd_val(*pmdp)); 3093 return; 3094 } 3095 printf("pmdp @ 0x%px = 0x%016lx\n", pmdp, pmd_val(*pmdp)); 3096 3097 ptep = pte_offset_map(pmdp, addr); 3098 if (pte_none(*ptep)) { 3099 printf("no valid PTE\n"); 3100 return; 3101 } 3102 3103 format_pte(ptep, pte_val(*ptep)); 3104 3105 sync(); 3106 __delay(200); 3107 catch_memory_errors = 0; 3108 } 3109 #else 3110 static void show_pte(unsigned long addr) 3111 { 3112 printf("show_pte not yet implemented\n"); 3113 } 3114 #endif /* CONFIG_PPC_BOOK3S_64 */ 3115 3116 static void show_tasks(void) 3117 { 3118 unsigned long tskv; 3119 struct task_struct *tsk = NULL; 3120 3121 printf(" task_struct ->thread.ksp PID PPID S P CMD\n"); 3122 3123 if (scanhex(&tskv)) 3124 tsk = (struct task_struct *)tskv; 3125 3126 if (setjmp(bus_error_jmp) != 0) { 3127 catch_memory_errors = 0; 3128 printf("*** Error dumping task %px\n", tsk); 3129 return; 3130 } 3131 3132 catch_memory_errors = 1; 3133 sync(); 3134 3135 if (tsk) 3136 show_task(tsk); 3137 else 3138 for_each_process(tsk) 3139 show_task(tsk); 3140 3141 sync(); 3142 __delay(200); 3143 catch_memory_errors = 0; 3144 } 3145 3146 static void proccall(void) 3147 { 3148 unsigned long args[8]; 3149 unsigned long ret; 3150 int i; 3151 typedef unsigned long (*callfunc_t)(unsigned long, unsigned long, 3152 unsigned long, unsigned long, unsigned long, 3153 unsigned long, unsigned long, unsigned long); 3154 callfunc_t func; 3155 3156 if (!scanhex(&adrs)) 3157 return; 3158 if (termch != '\n') 3159 termch = 0; 3160 for (i = 0; i < 8; ++i) 3161 args[i] = 0; 3162 for (i = 0; i < 8; ++i) { 3163 if (!scanhex(&args[i]) || termch == '\n') 3164 break; 3165 termch = 0; 3166 } 3167 func = (callfunc_t) adrs; 3168 ret = 0; 3169 if (setjmp(bus_error_jmp) == 0) { 3170 catch_memory_errors = 1; 3171 sync(); 3172 ret = func(args[0], args[1], args[2], args[3], 3173 args[4], args[5], args[6], args[7]); 3174 sync(); 3175 printf("return value is 0x%lx\n", ret); 3176 } else { 3177 printf("*** %x exception occurred\n", fault_except); 3178 } 3179 catch_memory_errors = 0; 3180 } 3181 3182 /* Input scanning routines */ 3183 int 3184 skipbl(void) 3185 { 3186 int c; 3187 3188 if( termch != 0 ){ 3189 c = termch; 3190 termch = 0; 3191 } else 3192 c = inchar(); 3193 while( c == ' ' || c == '\t' ) 3194 c = inchar(); 3195 return c; 3196 } 3197 3198 #define N_PTREGS 44 3199 static const char *regnames[N_PTREGS] = { 3200 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", 3201 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", 3202 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", 3203 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", 3204 "pc", "msr", "or3", "ctr", "lr", "xer", "ccr", 3205 #ifdef CONFIG_PPC64 3206 "softe", 3207 #else 3208 "mq", 3209 #endif 3210 "trap", "dar", "dsisr", "res" 3211 }; 3212 3213 int 3214 scanhex(unsigned long *vp) 3215 { 3216 int c, d; 3217 unsigned long v; 3218 3219 c = skipbl(); 3220 if (c == '%') { 3221 /* parse register name */ 3222 char regname[8]; 3223 int i; 3224 3225 for (i = 0; i < sizeof(regname) - 1; ++i) { 3226 c = inchar(); 3227 if (!isalnum(c)) { 3228 termch = c; 3229 break; 3230 } 3231 regname[i] = c; 3232 } 3233 regname[i] = 0; 3234 i = match_string(regnames, N_PTREGS, regname); 3235 if (i < 0) { 3236 printf("invalid register name '%%%s'\n", regname); 3237 return 0; 3238 } 3239 if (xmon_regs == NULL) { 3240 printf("regs not available\n"); 3241 return 0; 3242 } 3243 *vp = ((unsigned long *)xmon_regs)[i]; 3244 return 1; 3245 } 3246 3247 /* skip leading "0x" if any */ 3248 3249 if (c == '0') { 3250 c = inchar(); 3251 if (c == 'x') { 3252 c = inchar(); 3253 } else { 3254 d = hexdigit(c); 3255 if (d == EOF) { 3256 termch = c; 3257 *vp = 0; 3258 return 1; 3259 } 3260 } 3261 } else if (c == '$') { 3262 int i; 3263 for (i=0; i<63; i++) { 3264 c = inchar(); 3265 if (isspace(c) || c == '\0') { 3266 termch = c; 3267 break; 3268 } 3269 tmpstr[i] = c; 3270 } 3271 tmpstr[i++] = 0; 3272 *vp = 0; 3273 if (setjmp(bus_error_jmp) == 0) { 3274 catch_memory_errors = 1; 3275 sync(); 3276 *vp = kallsyms_lookup_name(tmpstr); 3277 sync(); 3278 } 3279 catch_memory_errors = 0; 3280 if (!(*vp)) { 3281 printf("unknown symbol '%s'\n", tmpstr); 3282 return 0; 3283 } 3284 return 1; 3285 } 3286 3287 d = hexdigit(c); 3288 if (d == EOF) { 3289 termch = c; 3290 return 0; 3291 } 3292 v = 0; 3293 do { 3294 v = (v << 4) + d; 3295 c = inchar(); 3296 d = hexdigit(c); 3297 } while (d != EOF); 3298 termch = c; 3299 *vp = v; 3300 return 1; 3301 } 3302 3303 static void 3304 scannl(void) 3305 { 3306 int c; 3307 3308 c = termch; 3309 termch = 0; 3310 while( c != '\n' ) 3311 c = inchar(); 3312 } 3313 3314 static int hexdigit(int c) 3315 { 3316 if( '0' <= c && c <= '9' ) 3317 return c - '0'; 3318 if( 'A' <= c && c <= 'F' ) 3319 return c - ('A' - 10); 3320 if( 'a' <= c && c <= 'f' ) 3321 return c - ('a' - 10); 3322 return EOF; 3323 } 3324 3325 void 3326 getstring(char *s, int size) 3327 { 3328 int c; 3329 3330 c = skipbl(); 3331 do { 3332 if( size > 1 ){ 3333 *s++ = c; 3334 --size; 3335 } 3336 c = inchar(); 3337 } while( c != ' ' && c != '\t' && c != '\n' ); 3338 termch = c; 3339 *s = 0; 3340 } 3341 3342 static char line[256]; 3343 static char *lineptr; 3344 3345 static void 3346 flush_input(void) 3347 { 3348 lineptr = NULL; 3349 } 3350 3351 static int 3352 inchar(void) 3353 { 3354 if (lineptr == NULL || *lineptr == 0) { 3355 if (xmon_gets(line, sizeof(line)) == NULL) { 3356 lineptr = NULL; 3357 return EOF; 3358 } 3359 lineptr = line; 3360 } 3361 return *lineptr++; 3362 } 3363 3364 static void 3365 take_input(char *str) 3366 { 3367 lineptr = str; 3368 } 3369 3370 3371 static void 3372 symbol_lookup(void) 3373 { 3374 int type = inchar(); 3375 unsigned long addr, cpu; 3376 void __percpu *ptr = NULL; 3377 static char tmp[64]; 3378 3379 switch (type) { 3380 case 'a': 3381 if (scanhex(&addr)) 3382 xmon_print_symbol(addr, ": ", "\n"); 3383 termch = 0; 3384 break; 3385 case 's': 3386 getstring(tmp, 64); 3387 if (setjmp(bus_error_jmp) == 0) { 3388 catch_memory_errors = 1; 3389 sync(); 3390 addr = kallsyms_lookup_name(tmp); 3391 if (addr) 3392 printf("%s: %lx\n", tmp, addr); 3393 else 3394 printf("Symbol '%s' not found.\n", tmp); 3395 sync(); 3396 } 3397 catch_memory_errors = 0; 3398 termch = 0; 3399 break; 3400 case 'p': 3401 getstring(tmp, 64); 3402 if (setjmp(bus_error_jmp) == 0) { 3403 catch_memory_errors = 1; 3404 sync(); 3405 ptr = (void __percpu *)kallsyms_lookup_name(tmp); 3406 sync(); 3407 } 3408 3409 if (ptr && 3410 ptr >= (void __percpu *)__per_cpu_start && 3411 ptr < (void __percpu *)__per_cpu_end) 3412 { 3413 if (scanhex(&cpu) && cpu < num_possible_cpus()) { 3414 addr = (unsigned long)per_cpu_ptr(ptr, cpu); 3415 } else { 3416 cpu = raw_smp_processor_id(); 3417 addr = (unsigned long)this_cpu_ptr(ptr); 3418 } 3419 3420 printf("%s for cpu 0x%lx: %lx\n", tmp, cpu, addr); 3421 } else { 3422 printf("Percpu symbol '%s' not found.\n", tmp); 3423 } 3424 3425 catch_memory_errors = 0; 3426 termch = 0; 3427 break; 3428 } 3429 } 3430 3431 3432 /* Print an address in numeric and symbolic form (if possible) */ 3433 static void xmon_print_symbol(unsigned long address, const char *mid, 3434 const char *after) 3435 { 3436 char *modname; 3437 const char *name = NULL; 3438 unsigned long offset, size; 3439 3440 printf(REG, address); 3441 if (setjmp(bus_error_jmp) == 0) { 3442 catch_memory_errors = 1; 3443 sync(); 3444 name = kallsyms_lookup(address, &size, &offset, &modname, 3445 tmpstr); 3446 sync(); 3447 /* wait a little while to see if we get a machine check */ 3448 __delay(200); 3449 } 3450 3451 catch_memory_errors = 0; 3452 3453 if (name) { 3454 printf("%s%s+%#lx/%#lx", mid, name, offset, size); 3455 if (modname) 3456 printf(" [%s]", modname); 3457 } 3458 printf("%s", after); 3459 } 3460 3461 #ifdef CONFIG_PPC_BOOK3S_64 3462 void dump_segments(void) 3463 { 3464 int i; 3465 unsigned long esid,vsid; 3466 unsigned long llp; 3467 3468 printf("SLB contents of cpu 0x%x\n", smp_processor_id()); 3469 3470 for (i = 0; i < mmu_slb_size; i++) { 3471 asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i)); 3472 asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i)); 3473 3474 if (!esid && !vsid) 3475 continue; 3476 3477 printf("%02d %016lx %016lx", i, esid, vsid); 3478 3479 if (!(esid & SLB_ESID_V)) { 3480 printf("\n"); 3481 continue; 3482 } 3483 3484 llp = vsid & SLB_VSID_LLP; 3485 if (vsid & SLB_VSID_B_1T) { 3486 printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n", 3487 GET_ESID_1T(esid), 3488 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T, 3489 llp); 3490 } else { 3491 printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n", 3492 GET_ESID(esid), 3493 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT, 3494 llp); 3495 } 3496 } 3497 } 3498 #endif 3499 3500 #ifdef CONFIG_PPC_BOOK3S_32 3501 void dump_segments(void) 3502 { 3503 int i; 3504 3505 printf("sr0-15 ="); 3506 for (i = 0; i < 16; ++i) 3507 printf(" %x", mfsrin(i << 28)); 3508 printf("\n"); 3509 } 3510 #endif 3511 3512 #ifdef CONFIG_44x 3513 static void dump_tlb_44x(void) 3514 { 3515 int i; 3516 3517 for (i = 0; i < PPC44x_TLB_SIZE; i++) { 3518 unsigned long w0,w1,w2; 3519 asm volatile("tlbre %0,%1,0" : "=r" (w0) : "r" (i)); 3520 asm volatile("tlbre %0,%1,1" : "=r" (w1) : "r" (i)); 3521 asm volatile("tlbre %0,%1,2" : "=r" (w2) : "r" (i)); 3522 printf("[%02x] %08lx %08lx %08lx ", i, w0, w1, w2); 3523 if (w0 & PPC44x_TLB_VALID) { 3524 printf("V %08lx -> %01lx%08lx %c%c%c%c%c", 3525 w0 & PPC44x_TLB_EPN_MASK, 3526 w1 & PPC44x_TLB_ERPN_MASK, 3527 w1 & PPC44x_TLB_RPN_MASK, 3528 (w2 & PPC44x_TLB_W) ? 'W' : 'w', 3529 (w2 & PPC44x_TLB_I) ? 'I' : 'i', 3530 (w2 & PPC44x_TLB_M) ? 'M' : 'm', 3531 (w2 & PPC44x_TLB_G) ? 'G' : 'g', 3532 (w2 & PPC44x_TLB_E) ? 'E' : 'e'); 3533 } 3534 printf("\n"); 3535 } 3536 } 3537 #endif /* CONFIG_44x */ 3538 3539 #ifdef CONFIG_PPC_BOOK3E 3540 static void dump_tlb_book3e(void) 3541 { 3542 u32 mmucfg, pidmask, lpidmask; 3543 u64 ramask; 3544 int i, tlb, ntlbs, pidsz, lpidsz, rasz, lrat = 0; 3545 int mmu_version; 3546 static const char *pgsz_names[] = { 3547 " 1K", 3548 " 2K", 3549 " 4K", 3550 " 8K", 3551 " 16K", 3552 " 32K", 3553 " 64K", 3554 "128K", 3555 "256K", 3556 "512K", 3557 " 1M", 3558 " 2M", 3559 " 4M", 3560 " 8M", 3561 " 16M", 3562 " 32M", 3563 " 64M", 3564 "128M", 3565 "256M", 3566 "512M", 3567 " 1G", 3568 " 2G", 3569 " 4G", 3570 " 8G", 3571 " 16G", 3572 " 32G", 3573 " 64G", 3574 "128G", 3575 "256G", 3576 "512G", 3577 " 1T", 3578 " 2T", 3579 }; 3580 3581 /* Gather some infos about the MMU */ 3582 mmucfg = mfspr(SPRN_MMUCFG); 3583 mmu_version = (mmucfg & 3) + 1; 3584 ntlbs = ((mmucfg >> 2) & 3) + 1; 3585 pidsz = ((mmucfg >> 6) & 0x1f) + 1; 3586 lpidsz = (mmucfg >> 24) & 0xf; 3587 rasz = (mmucfg >> 16) & 0x7f; 3588 if ((mmu_version > 1) && (mmucfg & 0x10000)) 3589 lrat = 1; 3590 printf("Book3E MMU MAV=%d.0,%d TLBs,%d-bit PID,%d-bit LPID,%d-bit RA\n", 3591 mmu_version, ntlbs, pidsz, lpidsz, rasz); 3592 pidmask = (1ul << pidsz) - 1; 3593 lpidmask = (1ul << lpidsz) - 1; 3594 ramask = (1ull << rasz) - 1; 3595 3596 for (tlb = 0; tlb < ntlbs; tlb++) { 3597 u32 tlbcfg; 3598 int nent, assoc, new_cc = 1; 3599 printf("TLB %d:\n------\n", tlb); 3600 switch(tlb) { 3601 case 0: 3602 tlbcfg = mfspr(SPRN_TLB0CFG); 3603 break; 3604 case 1: 3605 tlbcfg = mfspr(SPRN_TLB1CFG); 3606 break; 3607 case 2: 3608 tlbcfg = mfspr(SPRN_TLB2CFG); 3609 break; 3610 case 3: 3611 tlbcfg = mfspr(SPRN_TLB3CFG); 3612 break; 3613 default: 3614 printf("Unsupported TLB number !\n"); 3615 continue; 3616 } 3617 nent = tlbcfg & 0xfff; 3618 assoc = (tlbcfg >> 24) & 0xff; 3619 for (i = 0; i < nent; i++) { 3620 u32 mas0 = MAS0_TLBSEL(tlb); 3621 u32 mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K); 3622 u64 mas2 = 0; 3623 u64 mas7_mas3; 3624 int esel = i, cc = i; 3625 3626 if (assoc != 0) { 3627 cc = i / assoc; 3628 esel = i % assoc; 3629 mas2 = cc * 0x1000; 3630 } 3631 3632 mas0 |= MAS0_ESEL(esel); 3633 mtspr(SPRN_MAS0, mas0); 3634 mtspr(SPRN_MAS1, mas1); 3635 mtspr(SPRN_MAS2, mas2); 3636 asm volatile("tlbre 0,0,0" : : : "memory"); 3637 mas1 = mfspr(SPRN_MAS1); 3638 mas2 = mfspr(SPRN_MAS2); 3639 mas7_mas3 = mfspr(SPRN_MAS7_MAS3); 3640 if (assoc && (i % assoc) == 0) 3641 new_cc = 1; 3642 if (!(mas1 & MAS1_VALID)) 3643 continue; 3644 if (assoc == 0) 3645 printf("%04x- ", i); 3646 else if (new_cc) 3647 printf("%04x-%c", cc, 'A' + esel); 3648 else 3649 printf(" |%c", 'A' + esel); 3650 new_cc = 0; 3651 printf(" %016llx %04x %s %c%c AS%c", 3652 mas2 & ~0x3ffull, 3653 (mas1 >> 16) & 0x3fff, 3654 pgsz_names[(mas1 >> 7) & 0x1f], 3655 mas1 & MAS1_IND ? 'I' : ' ', 3656 mas1 & MAS1_IPROT ? 'P' : ' ', 3657 mas1 & MAS1_TS ? '1' : '0'); 3658 printf(" %c%c%c%c%c%c%c", 3659 mas2 & MAS2_X0 ? 'a' : ' ', 3660 mas2 & MAS2_X1 ? 'v' : ' ', 3661 mas2 & MAS2_W ? 'w' : ' ', 3662 mas2 & MAS2_I ? 'i' : ' ', 3663 mas2 & MAS2_M ? 'm' : ' ', 3664 mas2 & MAS2_G ? 'g' : ' ', 3665 mas2 & MAS2_E ? 'e' : ' '); 3666 printf(" %016llx", mas7_mas3 & ramask & ~0x7ffull); 3667 if (mas1 & MAS1_IND) 3668 printf(" %s\n", 3669 pgsz_names[(mas7_mas3 >> 1) & 0x1f]); 3670 else 3671 printf(" U%c%c%c S%c%c%c\n", 3672 mas7_mas3 & MAS3_UX ? 'x' : ' ', 3673 mas7_mas3 & MAS3_UW ? 'w' : ' ', 3674 mas7_mas3 & MAS3_UR ? 'r' : ' ', 3675 mas7_mas3 & MAS3_SX ? 'x' : ' ', 3676 mas7_mas3 & MAS3_SW ? 'w' : ' ', 3677 mas7_mas3 & MAS3_SR ? 'r' : ' '); 3678 } 3679 } 3680 } 3681 #endif /* CONFIG_PPC_BOOK3E */ 3682 3683 static void xmon_init(int enable) 3684 { 3685 if (enable) { 3686 __debugger = xmon; 3687 __debugger_ipi = xmon_ipi; 3688 __debugger_bpt = xmon_bpt; 3689 __debugger_sstep = xmon_sstep; 3690 __debugger_iabr_match = xmon_iabr_match; 3691 __debugger_break_match = xmon_break_match; 3692 __debugger_fault_handler = xmon_fault_handler; 3693 3694 #ifdef CONFIG_PPC_PSERIES 3695 /* 3696 * Get the token here to avoid trying to get a lock 3697 * during the crash, causing a deadlock. 3698 */ 3699 set_indicator_token = rtas_token("set-indicator"); 3700 #endif 3701 } else { 3702 __debugger = NULL; 3703 __debugger_ipi = NULL; 3704 __debugger_bpt = NULL; 3705 __debugger_sstep = NULL; 3706 __debugger_iabr_match = NULL; 3707 __debugger_break_match = NULL; 3708 __debugger_fault_handler = NULL; 3709 } 3710 } 3711 3712 #ifdef CONFIG_MAGIC_SYSRQ 3713 static void sysrq_handle_xmon(int key) 3714 { 3715 /* ensure xmon is enabled */ 3716 xmon_init(1); 3717 debugger(get_irq_regs()); 3718 if (!xmon_on) 3719 xmon_init(0); 3720 } 3721 3722 static struct sysrq_key_op sysrq_xmon_op = { 3723 .handler = sysrq_handle_xmon, 3724 .help_msg = "xmon(x)", 3725 .action_msg = "Entering xmon", 3726 }; 3727 3728 static int __init setup_xmon_sysrq(void) 3729 { 3730 register_sysrq_key('x', &sysrq_xmon_op); 3731 return 0; 3732 } 3733 device_initcall(setup_xmon_sysrq); 3734 #endif /* CONFIG_MAGIC_SYSRQ */ 3735 3736 #ifdef CONFIG_DEBUG_FS 3737 static void clear_all_bpt(void) 3738 { 3739 int i; 3740 3741 /* clear/unpatch all breakpoints */ 3742 remove_bpts(); 3743 remove_cpu_bpts(); 3744 3745 /* Disable all breakpoints */ 3746 for (i = 0; i < NBPTS; ++i) 3747 bpts[i].enabled = 0; 3748 3749 /* Clear any data or iabr breakpoints */ 3750 if (iabr || dabr.enabled) { 3751 iabr = NULL; 3752 dabr.enabled = 0; 3753 } 3754 3755 printf("xmon: All breakpoints cleared\n"); 3756 } 3757 3758 static int xmon_dbgfs_set(void *data, u64 val) 3759 { 3760 xmon_on = !!val; 3761 xmon_init(xmon_on); 3762 3763 /* make sure all breakpoints removed when disabling */ 3764 if (!xmon_on) 3765 clear_all_bpt(); 3766 return 0; 3767 } 3768 3769 static int xmon_dbgfs_get(void *data, u64 *val) 3770 { 3771 *val = xmon_on; 3772 return 0; 3773 } 3774 3775 DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get, 3776 xmon_dbgfs_set, "%llu\n"); 3777 3778 static int __init setup_xmon_dbgfs(void) 3779 { 3780 debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL, 3781 &xmon_dbgfs_ops); 3782 return 0; 3783 } 3784 device_initcall(setup_xmon_dbgfs); 3785 #endif /* CONFIG_DEBUG_FS */ 3786 3787 static int xmon_early __initdata; 3788 3789 static int __init early_parse_xmon(char *p) 3790 { 3791 if (!p || strncmp(p, "early", 5) == 0) { 3792 /* just "xmon" is equivalent to "xmon=early" */ 3793 xmon_init(1); 3794 xmon_early = 1; 3795 xmon_on = 1; 3796 } else if (strncmp(p, "on", 2) == 0) { 3797 xmon_init(1); 3798 xmon_on = 1; 3799 } else if (strncmp(p, "off", 3) == 0) 3800 xmon_on = 0; 3801 else 3802 return 1; 3803 3804 return 0; 3805 } 3806 early_param("xmon", early_parse_xmon); 3807 3808 void __init xmon_setup(void) 3809 { 3810 if (xmon_on) 3811 xmon_init(1); 3812 if (xmon_early) 3813 debugger(NULL); 3814 } 3815 3816 #ifdef CONFIG_SPU_BASE 3817 3818 struct spu_info { 3819 struct spu *spu; 3820 u64 saved_mfc_sr1_RW; 3821 u32 saved_spu_runcntl_RW; 3822 unsigned long dump_addr; 3823 u8 stopped_ok; 3824 }; 3825 3826 #define XMON_NUM_SPUS 16 /* Enough for current hardware */ 3827 3828 static struct spu_info spu_info[XMON_NUM_SPUS]; 3829 3830 void xmon_register_spus(struct list_head *list) 3831 { 3832 struct spu *spu; 3833 3834 list_for_each_entry(spu, list, full_list) { 3835 if (spu->number >= XMON_NUM_SPUS) { 3836 WARN_ON(1); 3837 continue; 3838 } 3839 3840 spu_info[spu->number].spu = spu; 3841 spu_info[spu->number].stopped_ok = 0; 3842 spu_info[spu->number].dump_addr = (unsigned long) 3843 spu_info[spu->number].spu->local_store; 3844 } 3845 } 3846 3847 static void stop_spus(void) 3848 { 3849 struct spu *spu; 3850 int i; 3851 u64 tmp; 3852 3853 for (i = 0; i < XMON_NUM_SPUS; i++) { 3854 if (!spu_info[i].spu) 3855 continue; 3856 3857 if (setjmp(bus_error_jmp) == 0) { 3858 catch_memory_errors = 1; 3859 sync(); 3860 3861 spu = spu_info[i].spu; 3862 3863 spu_info[i].saved_spu_runcntl_RW = 3864 in_be32(&spu->problem->spu_runcntl_RW); 3865 3866 tmp = spu_mfc_sr1_get(spu); 3867 spu_info[i].saved_mfc_sr1_RW = tmp; 3868 3869 tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK; 3870 spu_mfc_sr1_set(spu, tmp); 3871 3872 sync(); 3873 __delay(200); 3874 3875 spu_info[i].stopped_ok = 1; 3876 3877 printf("Stopped spu %.2d (was %s)\n", i, 3878 spu_info[i].saved_spu_runcntl_RW ? 3879 "running" : "stopped"); 3880 } else { 3881 catch_memory_errors = 0; 3882 printf("*** Error stopping spu %.2d\n", i); 3883 } 3884 catch_memory_errors = 0; 3885 } 3886 } 3887 3888 static void restart_spus(void) 3889 { 3890 struct spu *spu; 3891 int i; 3892 3893 for (i = 0; i < XMON_NUM_SPUS; i++) { 3894 if (!spu_info[i].spu) 3895 continue; 3896 3897 if (!spu_info[i].stopped_ok) { 3898 printf("*** Error, spu %d was not successfully stopped" 3899 ", not restarting\n", i); 3900 continue; 3901 } 3902 3903 if (setjmp(bus_error_jmp) == 0) { 3904 catch_memory_errors = 1; 3905 sync(); 3906 3907 spu = spu_info[i].spu; 3908 spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW); 3909 out_be32(&spu->problem->spu_runcntl_RW, 3910 spu_info[i].saved_spu_runcntl_RW); 3911 3912 sync(); 3913 __delay(200); 3914 3915 printf("Restarted spu %.2d\n", i); 3916 } else { 3917 catch_memory_errors = 0; 3918 printf("*** Error restarting spu %.2d\n", i); 3919 } 3920 catch_memory_errors = 0; 3921 } 3922 } 3923 3924 #define DUMP_WIDTH 23 3925 #define DUMP_VALUE(format, field, value) \ 3926 do { \ 3927 if (setjmp(bus_error_jmp) == 0) { \ 3928 catch_memory_errors = 1; \ 3929 sync(); \ 3930 printf(" %-*s = "format"\n", DUMP_WIDTH, \ 3931 #field, value); \ 3932 sync(); \ 3933 __delay(200); \ 3934 } else { \ 3935 catch_memory_errors = 0; \ 3936 printf(" %-*s = *** Error reading field.\n", \ 3937 DUMP_WIDTH, #field); \ 3938 } \ 3939 catch_memory_errors = 0; \ 3940 } while (0) 3941 3942 #define DUMP_FIELD(obj, format, field) \ 3943 DUMP_VALUE(format, field, obj->field) 3944 3945 static void dump_spu_fields(struct spu *spu) 3946 { 3947 printf("Dumping spu fields at address %p:\n", spu); 3948 3949 DUMP_FIELD(spu, "0x%x", number); 3950 DUMP_FIELD(spu, "%s", name); 3951 DUMP_FIELD(spu, "0x%lx", local_store_phys); 3952 DUMP_FIELD(spu, "0x%p", local_store); 3953 DUMP_FIELD(spu, "0x%lx", ls_size); 3954 DUMP_FIELD(spu, "0x%x", node); 3955 DUMP_FIELD(spu, "0x%lx", flags); 3956 DUMP_FIELD(spu, "%llu", class_0_pending); 3957 DUMP_FIELD(spu, "0x%llx", class_0_dar); 3958 DUMP_FIELD(spu, "0x%llx", class_1_dar); 3959 DUMP_FIELD(spu, "0x%llx", class_1_dsisr); 3960 DUMP_FIELD(spu, "0x%x", irqs[0]); 3961 DUMP_FIELD(spu, "0x%x", irqs[1]); 3962 DUMP_FIELD(spu, "0x%x", irqs[2]); 3963 DUMP_FIELD(spu, "0x%x", slb_replace); 3964 DUMP_FIELD(spu, "%d", pid); 3965 DUMP_FIELD(spu, "0x%p", mm); 3966 DUMP_FIELD(spu, "0x%p", ctx); 3967 DUMP_FIELD(spu, "0x%p", rq); 3968 DUMP_FIELD(spu, "0x%llx", timestamp); 3969 DUMP_FIELD(spu, "0x%lx", problem_phys); 3970 DUMP_FIELD(spu, "0x%p", problem); 3971 DUMP_VALUE("0x%x", problem->spu_runcntl_RW, 3972 in_be32(&spu->problem->spu_runcntl_RW)); 3973 DUMP_VALUE("0x%x", problem->spu_status_R, 3974 in_be32(&spu->problem->spu_status_R)); 3975 DUMP_VALUE("0x%x", problem->spu_npc_RW, 3976 in_be32(&spu->problem->spu_npc_RW)); 3977 DUMP_FIELD(spu, "0x%p", priv2); 3978 DUMP_FIELD(spu, "0x%p", pdata); 3979 } 3980 3981 int 3982 spu_inst_dump(unsigned long adr, long count, int praddr) 3983 { 3984 return generic_inst_dump(adr, count, praddr, print_insn_spu); 3985 } 3986 3987 static void dump_spu_ls(unsigned long num, int subcmd) 3988 { 3989 unsigned long offset, addr, ls_addr; 3990 3991 if (setjmp(bus_error_jmp) == 0) { 3992 catch_memory_errors = 1; 3993 sync(); 3994 ls_addr = (unsigned long)spu_info[num].spu->local_store; 3995 sync(); 3996 __delay(200); 3997 } else { 3998 catch_memory_errors = 0; 3999 printf("*** Error: accessing spu info for spu %ld\n", num); 4000 return; 4001 } 4002 catch_memory_errors = 0; 4003 4004 if (scanhex(&offset)) 4005 addr = ls_addr + offset; 4006 else 4007 addr = spu_info[num].dump_addr; 4008 4009 if (addr >= ls_addr + LS_SIZE) { 4010 printf("*** Error: address outside of local store\n"); 4011 return; 4012 } 4013 4014 switch (subcmd) { 4015 case 'i': 4016 addr += spu_inst_dump(addr, 16, 1); 4017 last_cmd = "sdi\n"; 4018 break; 4019 default: 4020 prdump(addr, 64); 4021 addr += 64; 4022 last_cmd = "sd\n"; 4023 break; 4024 } 4025 4026 spu_info[num].dump_addr = addr; 4027 } 4028 4029 static int do_spu_cmd(void) 4030 { 4031 static unsigned long num = 0; 4032 int cmd, subcmd = 0; 4033 4034 cmd = inchar(); 4035 switch (cmd) { 4036 case 's': 4037 stop_spus(); 4038 break; 4039 case 'r': 4040 restart_spus(); 4041 break; 4042 case 'd': 4043 subcmd = inchar(); 4044 if (isxdigit(subcmd) || subcmd == '\n') 4045 termch = subcmd; 4046 /* fall through */ 4047 case 'f': 4048 scanhex(&num); 4049 if (num >= XMON_NUM_SPUS || !spu_info[num].spu) { 4050 printf("*** Error: invalid spu number\n"); 4051 return 0; 4052 } 4053 4054 switch (cmd) { 4055 case 'f': 4056 dump_spu_fields(spu_info[num].spu); 4057 break; 4058 default: 4059 dump_spu_ls(num, subcmd); 4060 break; 4061 } 4062 4063 break; 4064 default: 4065 return -1; 4066 } 4067 4068 return 0; 4069 } 4070 #else /* ! CONFIG_SPU_BASE */ 4071 static int do_spu_cmd(void) 4072 { 4073 return -1; 4074 } 4075 #endif 4076