1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Routines providing a simple monitor for use on the PowerMac. 4 * 5 * Copyright (C) 1996-2005 Paul Mackerras. 6 * Copyright (C) 2001 PPC64 Team, IBM Corp 7 * Copyrignt (C) 2006 Michael Ellerman, IBM Corp 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/errno.h> 12 #include <linux/sched/signal.h> 13 #include <linux/smp.h> 14 #include <linux/mm.h> 15 #include <linux/reboot.h> 16 #include <linux/delay.h> 17 #include <linux/kallsyms.h> 18 #include <linux/kmsg_dump.h> 19 #include <linux/cpumask.h> 20 #include <linux/export.h> 21 #include <linux/sysrq.h> 22 #include <linux/interrupt.h> 23 #include <linux/irq.h> 24 #include <linux/bug.h> 25 #include <linux/nmi.h> 26 #include <linux/ctype.h> 27 #include <linux/highmem.h> 28 29 #include <asm/debugfs.h> 30 #include <asm/ptrace.h> 31 #include <asm/smp.h> 32 #include <asm/string.h> 33 #include <asm/prom.h> 34 #include <asm/machdep.h> 35 #include <asm/xmon.h> 36 #include <asm/processor.h> 37 #include <asm/pgtable.h> 38 #include <asm/mmu.h> 39 #include <asm/mmu_context.h> 40 #include <asm/plpar_wrappers.h> 41 #include <asm/cputable.h> 42 #include <asm/rtas.h> 43 #include <asm/sstep.h> 44 #include <asm/irq_regs.h> 45 #include <asm/spu.h> 46 #include <asm/spu_priv1.h> 47 #include <asm/setjmp.h> 48 #include <asm/reg.h> 49 #include <asm/debug.h> 50 #include <asm/hw_breakpoint.h> 51 #include <asm/xive.h> 52 #include <asm/opal.h> 53 #include <asm/firmware.h> 54 #include <asm/code-patching.h> 55 #include <asm/sections.h> 56 57 #ifdef CONFIG_PPC64 58 #include <asm/hvcall.h> 59 #include <asm/paca.h> 60 #endif 61 62 #include "nonstdio.h" 63 #include "dis-asm.h" 64 65 #ifdef CONFIG_SMP 66 static cpumask_t cpus_in_xmon = CPU_MASK_NONE; 67 static unsigned long xmon_taken = 1; 68 static int xmon_owner; 69 static int xmon_gate; 70 #else 71 #define xmon_owner 0 72 #endif /* CONFIG_SMP */ 73 74 #ifdef CONFIG_PPC_PSERIES 75 static int set_indicator_token = RTAS_UNKNOWN_SERVICE; 76 #endif 77 static unsigned long in_xmon __read_mostly = 0; 78 static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT); 79 static bool xmon_is_ro = IS_ENABLED(CONFIG_XMON_DEFAULT_RO_MODE); 80 81 static unsigned long adrs; 82 static int size = 1; 83 #define MAX_DUMP (128 * 1024) 84 static unsigned long ndump = 64; 85 static unsigned long nidump = 16; 86 static unsigned long ncsum = 4096; 87 static int termch; 88 static char tmpstr[128]; 89 static int tracing_enabled; 90 91 static long bus_error_jmp[JMP_BUF_LEN]; 92 static int catch_memory_errors; 93 static int catch_spr_faults; 94 static long *xmon_fault_jmp[NR_CPUS]; 95 96 /* Breakpoint stuff */ 97 struct bpt { 98 unsigned long address; 99 unsigned int instr[2]; 100 atomic_t ref_count; 101 int enabled; 102 unsigned long pad; 103 }; 104 105 /* Bits in bpt.enabled */ 106 #define BP_CIABR 1 107 #define BP_TRAP 2 108 #define BP_DABR 4 109 110 #define NBPTS 256 111 static struct bpt bpts[NBPTS]; 112 static struct bpt dabr; 113 static struct bpt *iabr; 114 static unsigned bpinstr = 0x7fe00008; /* trap */ 115 116 #define BP_NUM(bp) ((bp) - bpts + 1) 117 118 /* Prototypes */ 119 static int cmds(struct pt_regs *); 120 static int mread(unsigned long, void *, int); 121 static int mwrite(unsigned long, void *, int); 122 static int handle_fault(struct pt_regs *); 123 static void byterev(unsigned char *, int); 124 static void memex(void); 125 static int bsesc(void); 126 static void dump(void); 127 static void show_pte(unsigned long); 128 static void prdump(unsigned long, long); 129 static int ppc_inst_dump(unsigned long, long, int); 130 static void dump_log_buf(void); 131 132 #ifdef CONFIG_PPC_POWERNV 133 static void dump_opal_msglog(void); 134 #else 135 static inline void dump_opal_msglog(void) 136 { 137 printf("Machine is not running OPAL firmware.\n"); 138 } 139 #endif 140 141 static void backtrace(struct pt_regs *); 142 static void excprint(struct pt_regs *); 143 static void prregs(struct pt_regs *); 144 static void memops(int); 145 static void memlocate(void); 146 static void memzcan(void); 147 static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned); 148 int skipbl(void); 149 int scanhex(unsigned long *valp); 150 static void scannl(void); 151 static int hexdigit(int); 152 void getstring(char *, int); 153 static void flush_input(void); 154 static int inchar(void); 155 static void take_input(char *); 156 static int read_spr(int, unsigned long *); 157 static void write_spr(int, unsigned long); 158 static void super_regs(void); 159 static void remove_bpts(void); 160 static void insert_bpts(void); 161 static void remove_cpu_bpts(void); 162 static void insert_cpu_bpts(void); 163 static struct bpt *at_breakpoint(unsigned long pc); 164 static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp); 165 static int do_step(struct pt_regs *); 166 static void bpt_cmds(void); 167 static void cacheflush(void); 168 static int cpu_cmd(void); 169 static void csum(void); 170 static void bootcmds(void); 171 static void proccall(void); 172 static void show_tasks(void); 173 void dump_segments(void); 174 static void symbol_lookup(void); 175 static void xmon_show_stack(unsigned long sp, unsigned long lr, 176 unsigned long pc); 177 static void xmon_print_symbol(unsigned long address, const char *mid, 178 const char *after); 179 static const char *getvecname(unsigned long vec); 180 181 static int do_spu_cmd(void); 182 183 #ifdef CONFIG_44x 184 static void dump_tlb_44x(void); 185 #endif 186 #ifdef CONFIG_PPC_BOOK3E 187 static void dump_tlb_book3e(void); 188 #endif 189 190 #ifdef CONFIG_PPC64 191 #define REG "%.16lx" 192 #else 193 #define REG "%.8lx" 194 #endif 195 196 #ifdef __LITTLE_ENDIAN__ 197 #define GETWORD(v) (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0]) 198 #else 199 #define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3]) 200 #endif 201 202 static const char *xmon_ro_msg = "Operation disabled: xmon in read-only mode\n"; 203 204 static char *help_string = "\ 205 Commands:\n\ 206 b show breakpoints\n\ 207 bd set data breakpoint\n\ 208 bi set instruction breakpoint\n\ 209 bc clear breakpoint\n" 210 #ifdef CONFIG_SMP 211 "\ 212 c print cpus stopped in xmon\n\ 213 c# try to switch to cpu number h (in hex)\n" 214 #endif 215 "\ 216 C checksum\n\ 217 d dump bytes\n\ 218 d1 dump 1 byte values\n\ 219 d2 dump 2 byte values\n\ 220 d4 dump 4 byte values\n\ 221 d8 dump 8 byte values\n\ 222 di dump instructions\n\ 223 df dump float values\n\ 224 dd dump double values\n\ 225 dl dump the kernel log buffer\n" 226 #ifdef CONFIG_PPC_POWERNV 227 "\ 228 do dump the OPAL message log\n" 229 #endif 230 #ifdef CONFIG_PPC64 231 "\ 232 dp[#] dump paca for current cpu, or cpu #\n\ 233 dpa dump paca for all possible cpus\n" 234 #endif 235 "\ 236 dr dump stream of raw bytes\n\ 237 dv dump virtual address translation \n\ 238 dt dump the tracing buffers (uses printk)\n\ 239 dtc dump the tracing buffers for current CPU (uses printk)\n\ 240 " 241 #ifdef CONFIG_PPC_POWERNV 242 " dx# dump xive on CPU #\n\ 243 dxi# dump xive irq state #\n\ 244 dxa dump xive on all CPUs\n" 245 #endif 246 " e print exception information\n\ 247 f flush cache\n\ 248 la lookup symbol+offset of specified address\n\ 249 ls lookup address of specified symbol\n\ 250 lp s [#] lookup address of percpu symbol s for current cpu, or cpu #\n\ 251 m examine/change memory\n\ 252 mm move a block of memory\n\ 253 ms set a block of memory\n\ 254 md compare two blocks of memory\n\ 255 ml locate a block of memory\n\ 256 mz zero a block of memory\n\ 257 mi show information about memory allocation\n\ 258 p call a procedure\n\ 259 P list processes/tasks\n\ 260 r print registers\n\ 261 s single step\n" 262 #ifdef CONFIG_SPU_BASE 263 " ss stop execution on all spus\n\ 264 sr restore execution on stopped spus\n\ 265 sf # dump spu fields for spu # (in hex)\n\ 266 sd # dump spu local store for spu # (in hex)\n\ 267 sdi # disassemble spu local store for spu # (in hex)\n" 268 #endif 269 " S print special registers\n\ 270 Sa print all SPRs\n\ 271 Sr # read SPR #\n\ 272 Sw #v write v to SPR #\n\ 273 t print backtrace\n\ 274 x exit monitor and recover\n\ 275 X exit monitor and don't recover\n" 276 #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E) 277 " u dump segment table or SLB\n" 278 #elif defined(CONFIG_PPC_BOOK3S_32) 279 " u dump segment registers\n" 280 #elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E) 281 " u dump TLB\n" 282 #endif 283 " U show uptime information\n" 284 " ? help\n" 285 " # n limit output to n lines per page (for dp, dpa, dl)\n" 286 " zr reboot\n\ 287 zh halt\n" 288 ; 289 290 static struct pt_regs *xmon_regs; 291 292 static inline void sync(void) 293 { 294 asm volatile("sync; isync"); 295 } 296 297 static inline void store_inst(void *p) 298 { 299 asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p)); 300 } 301 302 static inline void cflush(void *p) 303 { 304 asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p)); 305 } 306 307 static inline void cinval(void *p) 308 { 309 asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p)); 310 } 311 312 /** 313 * write_ciabr() - write the CIABR SPR 314 * @ciabr: The value to write. 315 * 316 * This function writes a value to the CIARB register either directly 317 * through mtspr instruction if the kernel is in HV privilege mode or 318 * call a hypervisor function to achieve the same in case the kernel 319 * is in supervisor privilege mode. 320 */ 321 static void write_ciabr(unsigned long ciabr) 322 { 323 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 324 return; 325 326 if (cpu_has_feature(CPU_FTR_HVMODE)) { 327 mtspr(SPRN_CIABR, ciabr); 328 return; 329 } 330 plpar_set_ciabr(ciabr); 331 } 332 333 /** 334 * set_ciabr() - set the CIABR 335 * @addr: The value to set. 336 * 337 * This function sets the correct privilege value into the the HW 338 * breakpoint address before writing it up in the CIABR register. 339 */ 340 static void set_ciabr(unsigned long addr) 341 { 342 addr &= ~CIABR_PRIV; 343 344 if (cpu_has_feature(CPU_FTR_HVMODE)) 345 addr |= CIABR_PRIV_HYPER; 346 else 347 addr |= CIABR_PRIV_SUPER; 348 write_ciabr(addr); 349 } 350 351 /* 352 * Disable surveillance (the service processor watchdog function) 353 * while we are in xmon. 354 * XXX we should re-enable it when we leave. :) 355 */ 356 #define SURVEILLANCE_TOKEN 9000 357 358 static inline void disable_surveillance(void) 359 { 360 #ifdef CONFIG_PPC_PSERIES 361 /* Since this can't be a module, args should end up below 4GB. */ 362 static struct rtas_args args; 363 364 /* 365 * At this point we have got all the cpus we can into 366 * xmon, so there is hopefully no other cpu calling RTAS 367 * at the moment, even though we don't take rtas.lock. 368 * If we did try to take rtas.lock there would be a 369 * real possibility of deadlock. 370 */ 371 if (set_indicator_token == RTAS_UNKNOWN_SERVICE) 372 return; 373 374 rtas_call_unlocked(&args, set_indicator_token, 3, 1, NULL, 375 SURVEILLANCE_TOKEN, 0, 0); 376 377 #endif /* CONFIG_PPC_PSERIES */ 378 } 379 380 #ifdef CONFIG_SMP 381 static int xmon_speaker; 382 383 static void get_output_lock(void) 384 { 385 int me = smp_processor_id() + 0x100; 386 int last_speaker = 0, prev; 387 long timeout; 388 389 if (xmon_speaker == me) 390 return; 391 392 for (;;) { 393 last_speaker = cmpxchg(&xmon_speaker, 0, me); 394 if (last_speaker == 0) 395 return; 396 397 /* 398 * Wait a full second for the lock, we might be on a slow 399 * console, but check every 100us. 400 */ 401 timeout = 10000; 402 while (xmon_speaker == last_speaker) { 403 if (--timeout > 0) { 404 udelay(100); 405 continue; 406 } 407 408 /* hostile takeover */ 409 prev = cmpxchg(&xmon_speaker, last_speaker, me); 410 if (prev == last_speaker) 411 return; 412 break; 413 } 414 } 415 } 416 417 static void release_output_lock(void) 418 { 419 xmon_speaker = 0; 420 } 421 422 int cpus_are_in_xmon(void) 423 { 424 return !cpumask_empty(&cpus_in_xmon); 425 } 426 427 static bool wait_for_other_cpus(int ncpus) 428 { 429 unsigned long timeout; 430 431 /* We wait for 2s, which is a metric "little while" */ 432 for (timeout = 20000; timeout != 0; --timeout) { 433 if (cpumask_weight(&cpus_in_xmon) >= ncpus) 434 return true; 435 udelay(100); 436 barrier(); 437 } 438 439 return false; 440 } 441 #endif /* CONFIG_SMP */ 442 443 static inline int unrecoverable_excp(struct pt_regs *regs) 444 { 445 #if defined(CONFIG_4xx) || defined(CONFIG_PPC_BOOK3E) 446 /* We have no MSR_RI bit on 4xx or Book3e, so we simply return false */ 447 return 0; 448 #else 449 return ((regs->msr & MSR_RI) == 0); 450 #endif 451 } 452 453 static int xmon_core(struct pt_regs *regs, int fromipi) 454 { 455 int cmd = 0; 456 struct bpt *bp; 457 long recurse_jmp[JMP_BUF_LEN]; 458 unsigned long offset; 459 unsigned long flags; 460 #ifdef CONFIG_SMP 461 int cpu; 462 int secondary; 463 #endif 464 465 local_irq_save(flags); 466 hard_irq_disable(); 467 468 if (!fromipi) { 469 tracing_enabled = tracing_is_on(); 470 tracing_off(); 471 } 472 473 bp = in_breakpoint_table(regs->nip, &offset); 474 if (bp != NULL) { 475 regs->nip = bp->address + offset; 476 atomic_dec(&bp->ref_count); 477 } 478 479 remove_cpu_bpts(); 480 481 #ifdef CONFIG_SMP 482 cpu = smp_processor_id(); 483 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { 484 /* 485 * We catch SPR read/write faults here because the 0x700, 0xf60 486 * etc. handlers don't call debugger_fault_handler(). 487 */ 488 if (catch_spr_faults) 489 longjmp(bus_error_jmp, 1); 490 get_output_lock(); 491 excprint(regs); 492 printf("cpu 0x%x: Exception %lx %s in xmon, " 493 "returning to main loop\n", 494 cpu, regs->trap, getvecname(TRAP(regs))); 495 release_output_lock(); 496 longjmp(xmon_fault_jmp[cpu], 1); 497 } 498 499 if (setjmp(recurse_jmp) != 0) { 500 if (!in_xmon || !xmon_gate) { 501 get_output_lock(); 502 printf("xmon: WARNING: bad recursive fault " 503 "on cpu 0x%x\n", cpu); 504 release_output_lock(); 505 goto waiting; 506 } 507 secondary = !(xmon_taken && cpu == xmon_owner); 508 goto cmdloop; 509 } 510 511 xmon_fault_jmp[cpu] = recurse_jmp; 512 513 bp = NULL; 514 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) 515 bp = at_breakpoint(regs->nip); 516 if (bp || unrecoverable_excp(regs)) 517 fromipi = 0; 518 519 if (!fromipi) { 520 get_output_lock(); 521 excprint(regs); 522 if (bp) { 523 printf("cpu 0x%x stopped at breakpoint 0x%tx (", 524 cpu, BP_NUM(bp)); 525 xmon_print_symbol(regs->nip, " ", ")\n"); 526 } 527 if (unrecoverable_excp(regs)) 528 printf("WARNING: exception is not recoverable, " 529 "can't continue\n"); 530 release_output_lock(); 531 } 532 533 cpumask_set_cpu(cpu, &cpus_in_xmon); 534 535 waiting: 536 secondary = 1; 537 spin_begin(); 538 while (secondary && !xmon_gate) { 539 if (in_xmon == 0) { 540 if (fromipi) { 541 spin_end(); 542 goto leave; 543 } 544 secondary = test_and_set_bit(0, &in_xmon); 545 } 546 spin_cpu_relax(); 547 touch_nmi_watchdog(); 548 } 549 spin_end(); 550 551 if (!secondary && !xmon_gate) { 552 /* we are the first cpu to come in */ 553 /* interrupt other cpu(s) */ 554 int ncpus = num_online_cpus(); 555 556 xmon_owner = cpu; 557 mb(); 558 if (ncpus > 1) { 559 /* 560 * A system reset (trap == 0x100) can be triggered on 561 * all CPUs, so when we come in via 0x100 try waiting 562 * for the other CPUs to come in before we send the 563 * debugger break (IPI). This is similar to 564 * crash_kexec_secondary(). 565 */ 566 if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus)) 567 smp_send_debugger_break(); 568 569 wait_for_other_cpus(ncpus); 570 } 571 remove_bpts(); 572 disable_surveillance(); 573 /* for breakpoint or single step, print the current instr. */ 574 if (bp || TRAP(regs) == 0xd00) 575 ppc_inst_dump(regs->nip, 1, 0); 576 printf("enter ? for help\n"); 577 mb(); 578 xmon_gate = 1; 579 barrier(); 580 touch_nmi_watchdog(); 581 } 582 583 cmdloop: 584 while (in_xmon) { 585 if (secondary) { 586 spin_begin(); 587 if (cpu == xmon_owner) { 588 if (!test_and_set_bit(0, &xmon_taken)) { 589 secondary = 0; 590 spin_end(); 591 continue; 592 } 593 /* missed it */ 594 while (cpu == xmon_owner) 595 spin_cpu_relax(); 596 } 597 spin_cpu_relax(); 598 touch_nmi_watchdog(); 599 } else { 600 cmd = cmds(regs); 601 if (cmd != 0) { 602 /* exiting xmon */ 603 insert_bpts(); 604 xmon_gate = 0; 605 wmb(); 606 in_xmon = 0; 607 break; 608 } 609 /* have switched to some other cpu */ 610 secondary = 1; 611 } 612 } 613 leave: 614 cpumask_clear_cpu(cpu, &cpus_in_xmon); 615 xmon_fault_jmp[cpu] = NULL; 616 #else 617 /* UP is simple... */ 618 if (in_xmon) { 619 printf("Exception %lx %s in xmon, returning to main loop\n", 620 regs->trap, getvecname(TRAP(regs))); 621 longjmp(xmon_fault_jmp[0], 1); 622 } 623 if (setjmp(recurse_jmp) == 0) { 624 xmon_fault_jmp[0] = recurse_jmp; 625 in_xmon = 1; 626 627 excprint(regs); 628 bp = at_breakpoint(regs->nip); 629 if (bp) { 630 printf("Stopped at breakpoint %tx (", BP_NUM(bp)); 631 xmon_print_symbol(regs->nip, " ", ")\n"); 632 } 633 if (unrecoverable_excp(regs)) 634 printf("WARNING: exception is not recoverable, " 635 "can't continue\n"); 636 remove_bpts(); 637 disable_surveillance(); 638 /* for breakpoint or single step, print the current instr. */ 639 if (bp || TRAP(regs) == 0xd00) 640 ppc_inst_dump(regs->nip, 1, 0); 641 printf("enter ? for help\n"); 642 } 643 644 cmd = cmds(regs); 645 646 insert_bpts(); 647 in_xmon = 0; 648 #endif 649 650 #ifdef CONFIG_BOOKE 651 if (regs->msr & MSR_DE) { 652 bp = at_breakpoint(regs->nip); 653 if (bp != NULL) { 654 regs->nip = (unsigned long) &bp->instr[0]; 655 atomic_inc(&bp->ref_count); 656 } 657 } 658 #else 659 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { 660 bp = at_breakpoint(regs->nip); 661 if (bp != NULL) { 662 int stepped = emulate_step(regs, bp->instr[0]); 663 if (stepped == 0) { 664 regs->nip = (unsigned long) &bp->instr[0]; 665 atomic_inc(&bp->ref_count); 666 } else if (stepped < 0) { 667 printf("Couldn't single-step %s instruction\n", 668 (IS_RFID(bp->instr[0])? "rfid": "mtmsrd")); 669 } 670 } 671 } 672 #endif 673 insert_cpu_bpts(); 674 675 touch_nmi_watchdog(); 676 local_irq_restore(flags); 677 678 return cmd != 'X' && cmd != EOF; 679 } 680 681 int xmon(struct pt_regs *excp) 682 { 683 struct pt_regs regs; 684 685 if (excp == NULL) { 686 ppc_save_regs(®s); 687 excp = ®s; 688 } 689 690 return xmon_core(excp, 0); 691 } 692 EXPORT_SYMBOL(xmon); 693 694 irqreturn_t xmon_irq(int irq, void *d) 695 { 696 unsigned long flags; 697 local_irq_save(flags); 698 printf("Keyboard interrupt\n"); 699 xmon(get_irq_regs()); 700 local_irq_restore(flags); 701 return IRQ_HANDLED; 702 } 703 704 static int xmon_bpt(struct pt_regs *regs) 705 { 706 struct bpt *bp; 707 unsigned long offset; 708 709 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 710 return 0; 711 712 /* Are we at the trap at bp->instr[1] for some bp? */ 713 bp = in_breakpoint_table(regs->nip, &offset); 714 if (bp != NULL && offset == 4) { 715 regs->nip = bp->address + 4; 716 atomic_dec(&bp->ref_count); 717 return 1; 718 } 719 720 /* Are we at a breakpoint? */ 721 bp = at_breakpoint(regs->nip); 722 if (!bp) 723 return 0; 724 725 xmon_core(regs, 0); 726 727 return 1; 728 } 729 730 static int xmon_sstep(struct pt_regs *regs) 731 { 732 if (user_mode(regs)) 733 return 0; 734 xmon_core(regs, 0); 735 return 1; 736 } 737 738 static int xmon_break_match(struct pt_regs *regs) 739 { 740 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 741 return 0; 742 if (dabr.enabled == 0) 743 return 0; 744 xmon_core(regs, 0); 745 return 1; 746 } 747 748 static int xmon_iabr_match(struct pt_regs *regs) 749 { 750 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) 751 return 0; 752 if (iabr == NULL) 753 return 0; 754 xmon_core(regs, 0); 755 return 1; 756 } 757 758 static int xmon_ipi(struct pt_regs *regs) 759 { 760 #ifdef CONFIG_SMP 761 if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon)) 762 xmon_core(regs, 1); 763 #endif 764 return 0; 765 } 766 767 static int xmon_fault_handler(struct pt_regs *regs) 768 { 769 struct bpt *bp; 770 unsigned long offset; 771 772 if (in_xmon && catch_memory_errors) 773 handle_fault(regs); /* doesn't return */ 774 775 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { 776 bp = in_breakpoint_table(regs->nip, &offset); 777 if (bp != NULL) { 778 regs->nip = bp->address + offset; 779 atomic_dec(&bp->ref_count); 780 } 781 } 782 783 return 0; 784 } 785 786 /* Force enable xmon if not already enabled */ 787 static inline void force_enable_xmon(void) 788 { 789 /* Enable xmon hooks if needed */ 790 if (!xmon_on) { 791 printf("xmon: Enabling debugger hooks\n"); 792 xmon_on = 1; 793 } 794 } 795 796 static struct bpt *at_breakpoint(unsigned long pc) 797 { 798 int i; 799 struct bpt *bp; 800 801 bp = bpts; 802 for (i = 0; i < NBPTS; ++i, ++bp) 803 if (bp->enabled && pc == bp->address) 804 return bp; 805 return NULL; 806 } 807 808 static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp) 809 { 810 unsigned long off; 811 812 off = nip - (unsigned long) bpts; 813 if (off >= sizeof(bpts)) 814 return NULL; 815 off %= sizeof(struct bpt); 816 if (off != offsetof(struct bpt, instr[0]) 817 && off != offsetof(struct bpt, instr[1])) 818 return NULL; 819 *offp = off - offsetof(struct bpt, instr[0]); 820 return (struct bpt *) (nip - off); 821 } 822 823 static struct bpt *new_breakpoint(unsigned long a) 824 { 825 struct bpt *bp; 826 827 a &= ~3UL; 828 bp = at_breakpoint(a); 829 if (bp) 830 return bp; 831 832 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { 833 if (!bp->enabled && atomic_read(&bp->ref_count) == 0) { 834 bp->address = a; 835 bp->instr[1] = bpinstr; 836 store_inst(&bp->instr[1]); 837 return bp; 838 } 839 } 840 841 printf("Sorry, no free breakpoints. Please clear one first.\n"); 842 return NULL; 843 } 844 845 static void insert_bpts(void) 846 { 847 int i; 848 struct bpt *bp; 849 850 bp = bpts; 851 for (i = 0; i < NBPTS; ++i, ++bp) { 852 if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0) 853 continue; 854 if (mread(bp->address, &bp->instr[0], 4) != 4) { 855 printf("Couldn't read instruction at %lx, " 856 "disabling breakpoint there\n", bp->address); 857 bp->enabled = 0; 858 continue; 859 } 860 if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) { 861 printf("Breakpoint at %lx is on an mtmsrd or rfid " 862 "instruction, disabling it\n", bp->address); 863 bp->enabled = 0; 864 continue; 865 } 866 store_inst(&bp->instr[0]); 867 if (bp->enabled & BP_CIABR) 868 continue; 869 if (patch_instruction((unsigned int *)bp->address, 870 bpinstr) != 0) { 871 printf("Couldn't write instruction at %lx, " 872 "disabling breakpoint there\n", bp->address); 873 bp->enabled &= ~BP_TRAP; 874 continue; 875 } 876 store_inst((void *)bp->address); 877 } 878 } 879 880 static void insert_cpu_bpts(void) 881 { 882 struct arch_hw_breakpoint brk; 883 884 if (dabr.enabled) { 885 brk.address = dabr.address; 886 brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL; 887 brk.len = 8; 888 __set_breakpoint(&brk); 889 } 890 891 if (iabr) 892 set_ciabr(iabr->address); 893 } 894 895 static void remove_bpts(void) 896 { 897 int i; 898 struct bpt *bp; 899 unsigned instr; 900 901 bp = bpts; 902 for (i = 0; i < NBPTS; ++i, ++bp) { 903 if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP) 904 continue; 905 if (mread(bp->address, &instr, 4) == 4 906 && instr == bpinstr 907 && patch_instruction( 908 (unsigned int *)bp->address, bp->instr[0]) != 0) 909 printf("Couldn't remove breakpoint at %lx\n", 910 bp->address); 911 else 912 store_inst((void *)bp->address); 913 } 914 } 915 916 static void remove_cpu_bpts(void) 917 { 918 hw_breakpoint_disable(); 919 write_ciabr(0); 920 } 921 922 /* Based on uptime_proc_show(). */ 923 static void 924 show_uptime(void) 925 { 926 struct timespec64 uptime; 927 928 if (setjmp(bus_error_jmp) == 0) { 929 catch_memory_errors = 1; 930 sync(); 931 932 ktime_get_coarse_boottime_ts64(&uptime); 933 printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec, 934 ((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100))); 935 936 sync(); 937 __delay(200); \ 938 } 939 catch_memory_errors = 0; 940 } 941 942 static void set_lpp_cmd(void) 943 { 944 unsigned long lpp; 945 946 if (!scanhex(&lpp)) { 947 printf("Invalid number.\n"); 948 lpp = 0; 949 } 950 xmon_set_pagination_lpp(lpp); 951 } 952 /* Command interpreting routine */ 953 static char *last_cmd; 954 955 static int 956 cmds(struct pt_regs *excp) 957 { 958 int cmd = 0; 959 960 last_cmd = NULL; 961 xmon_regs = excp; 962 963 xmon_show_stack(excp->gpr[1], excp->link, excp->nip); 964 965 for(;;) { 966 #ifdef CONFIG_SMP 967 printf("%x:", smp_processor_id()); 968 #endif /* CONFIG_SMP */ 969 printf("mon> "); 970 flush_input(); 971 termch = 0; 972 cmd = skipbl(); 973 if( cmd == '\n' ) { 974 if (last_cmd == NULL) 975 continue; 976 take_input(last_cmd); 977 last_cmd = NULL; 978 cmd = inchar(); 979 } 980 switch (cmd) { 981 case 'm': 982 cmd = inchar(); 983 switch (cmd) { 984 case 'm': 985 case 's': 986 case 'd': 987 memops(cmd); 988 break; 989 case 'l': 990 memlocate(); 991 break; 992 case 'z': 993 if (xmon_is_ro) { 994 printf(xmon_ro_msg); 995 break; 996 } 997 memzcan(); 998 break; 999 case 'i': 1000 show_mem(0, NULL); 1001 break; 1002 default: 1003 termch = cmd; 1004 memex(); 1005 } 1006 break; 1007 case 'd': 1008 dump(); 1009 break; 1010 case 'l': 1011 symbol_lookup(); 1012 break; 1013 case 'r': 1014 prregs(excp); /* print regs */ 1015 break; 1016 case 'e': 1017 excprint(excp); 1018 break; 1019 case 'S': 1020 super_regs(); 1021 break; 1022 case 't': 1023 backtrace(excp); 1024 break; 1025 case 'f': 1026 cacheflush(); 1027 break; 1028 case 's': 1029 if (do_spu_cmd() == 0) 1030 break; 1031 if (do_step(excp)) 1032 return cmd; 1033 break; 1034 case 'x': 1035 case 'X': 1036 if (tracing_enabled) 1037 tracing_on(); 1038 return cmd; 1039 case EOF: 1040 printf(" <no input ...>\n"); 1041 mdelay(2000); 1042 return cmd; 1043 case '?': 1044 xmon_puts(help_string); 1045 break; 1046 case '#': 1047 set_lpp_cmd(); 1048 break; 1049 case 'b': 1050 if (xmon_is_ro) { 1051 printf(xmon_ro_msg); 1052 break; 1053 } 1054 bpt_cmds(); 1055 break; 1056 case 'C': 1057 csum(); 1058 break; 1059 case 'c': 1060 if (cpu_cmd()) 1061 return 0; 1062 break; 1063 case 'z': 1064 bootcmds(); 1065 break; 1066 case 'p': 1067 if (xmon_is_ro) { 1068 printf(xmon_ro_msg); 1069 break; 1070 } 1071 proccall(); 1072 break; 1073 case 'P': 1074 show_tasks(); 1075 break; 1076 #ifdef CONFIG_PPC_BOOK3S 1077 case 'u': 1078 dump_segments(); 1079 break; 1080 #elif defined(CONFIG_44x) 1081 case 'u': 1082 dump_tlb_44x(); 1083 break; 1084 #elif defined(CONFIG_PPC_BOOK3E) 1085 case 'u': 1086 dump_tlb_book3e(); 1087 break; 1088 #endif 1089 case 'U': 1090 show_uptime(); 1091 break; 1092 default: 1093 printf("Unrecognized command: "); 1094 do { 1095 if (' ' < cmd && cmd <= '~') 1096 putchar(cmd); 1097 else 1098 printf("\\x%x", cmd); 1099 cmd = inchar(); 1100 } while (cmd != '\n'); 1101 printf(" (type ? for help)\n"); 1102 break; 1103 } 1104 } 1105 } 1106 1107 #ifdef CONFIG_BOOKE 1108 static int do_step(struct pt_regs *regs) 1109 { 1110 regs->msr |= MSR_DE; 1111 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); 1112 return 1; 1113 } 1114 #else 1115 /* 1116 * Step a single instruction. 1117 * Some instructions we emulate, others we execute with MSR_SE set. 1118 */ 1119 static int do_step(struct pt_regs *regs) 1120 { 1121 unsigned int instr; 1122 int stepped; 1123 1124 force_enable_xmon(); 1125 /* check we are in 64-bit kernel mode, translation enabled */ 1126 if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) { 1127 if (mread(regs->nip, &instr, 4) == 4) { 1128 stepped = emulate_step(regs, instr); 1129 if (stepped < 0) { 1130 printf("Couldn't single-step %s instruction\n", 1131 (IS_RFID(instr)? "rfid": "mtmsrd")); 1132 return 0; 1133 } 1134 if (stepped > 0) { 1135 regs->trap = 0xd00 | (regs->trap & 1); 1136 printf("stepped to "); 1137 xmon_print_symbol(regs->nip, " ", "\n"); 1138 ppc_inst_dump(regs->nip, 1, 0); 1139 return 0; 1140 } 1141 } 1142 } 1143 regs->msr |= MSR_SE; 1144 return 1; 1145 } 1146 #endif 1147 1148 static void bootcmds(void) 1149 { 1150 int cmd; 1151 1152 cmd = inchar(); 1153 if (cmd == 'r') 1154 ppc_md.restart(NULL); 1155 else if (cmd == 'h') 1156 ppc_md.halt(); 1157 else if (cmd == 'p') 1158 if (pm_power_off) 1159 pm_power_off(); 1160 } 1161 1162 static int cpu_cmd(void) 1163 { 1164 #ifdef CONFIG_SMP 1165 unsigned long cpu, first_cpu, last_cpu; 1166 int timeout; 1167 1168 if (!scanhex(&cpu)) { 1169 /* print cpus waiting or in xmon */ 1170 printf("cpus stopped:"); 1171 last_cpu = first_cpu = NR_CPUS; 1172 for_each_possible_cpu(cpu) { 1173 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { 1174 if (cpu == last_cpu + 1) { 1175 last_cpu = cpu; 1176 } else { 1177 if (last_cpu != first_cpu) 1178 printf("-0x%lx", last_cpu); 1179 last_cpu = first_cpu = cpu; 1180 printf(" 0x%lx", cpu); 1181 } 1182 } 1183 } 1184 if (last_cpu != first_cpu) 1185 printf("-0x%lx", last_cpu); 1186 printf("\n"); 1187 return 0; 1188 } 1189 /* try to switch to cpu specified */ 1190 if (!cpumask_test_cpu(cpu, &cpus_in_xmon)) { 1191 printf("cpu 0x%lx isn't in xmon\n", cpu); 1192 #ifdef CONFIG_PPC64 1193 printf("backtrace of paca[0x%lx].saved_r1 (possibly stale):\n", cpu); 1194 xmon_show_stack(paca_ptrs[cpu]->saved_r1, 0, 0); 1195 #endif 1196 return 0; 1197 } 1198 xmon_taken = 0; 1199 mb(); 1200 xmon_owner = cpu; 1201 timeout = 10000000; 1202 while (!xmon_taken) { 1203 if (--timeout == 0) { 1204 if (test_and_set_bit(0, &xmon_taken)) 1205 break; 1206 /* take control back */ 1207 mb(); 1208 xmon_owner = smp_processor_id(); 1209 printf("cpu 0x%lx didn't take control\n", cpu); 1210 return 0; 1211 } 1212 barrier(); 1213 } 1214 return 1; 1215 #else 1216 return 0; 1217 #endif /* CONFIG_SMP */ 1218 } 1219 1220 static unsigned short fcstab[256] = { 1221 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 1222 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 1223 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 1224 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 1225 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 1226 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 1227 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 1228 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 1229 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 1230 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 1231 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 1232 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 1233 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 1234 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 1235 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 1236 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 1237 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 1238 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 1239 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 1240 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 1241 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 1242 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 1243 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 1244 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 1245 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 1246 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 1247 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 1248 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 1249 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 1250 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 1251 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 1252 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 1253 }; 1254 1255 #define FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff]) 1256 1257 static void 1258 csum(void) 1259 { 1260 unsigned int i; 1261 unsigned short fcs; 1262 unsigned char v; 1263 1264 if (!scanhex(&adrs)) 1265 return; 1266 if (!scanhex(&ncsum)) 1267 return; 1268 fcs = 0xffff; 1269 for (i = 0; i < ncsum; ++i) { 1270 if (mread(adrs+i, &v, 1) == 0) { 1271 printf("csum stopped at "REG"\n", adrs+i); 1272 break; 1273 } 1274 fcs = FCS(fcs, v); 1275 } 1276 printf("%x\n", fcs); 1277 } 1278 1279 /* 1280 * Check if this is a suitable place to put a breakpoint. 1281 */ 1282 static long check_bp_loc(unsigned long addr) 1283 { 1284 unsigned int instr; 1285 1286 addr &= ~3; 1287 if (!is_kernel_addr(addr)) { 1288 printf("Breakpoints may only be placed at kernel addresses\n"); 1289 return 0; 1290 } 1291 if (!mread(addr, &instr, sizeof(instr))) { 1292 printf("Can't read instruction at address %lx\n", addr); 1293 return 0; 1294 } 1295 if (IS_MTMSRD(instr) || IS_RFID(instr)) { 1296 printf("Breakpoints may not be placed on mtmsrd or rfid " 1297 "instructions\n"); 1298 return 0; 1299 } 1300 return 1; 1301 } 1302 1303 static char *breakpoint_help_string = 1304 "Breakpoint command usage:\n" 1305 "b show breakpoints\n" 1306 "b <addr> [cnt] set breakpoint at given instr addr\n" 1307 "bc clear all breakpoints\n" 1308 "bc <n/addr> clear breakpoint number n or at addr\n" 1309 "bi <addr> [cnt] set hardware instr breakpoint (POWER8 only)\n" 1310 "bd <addr> [cnt] set hardware data breakpoint\n" 1311 ""; 1312 1313 static void 1314 bpt_cmds(void) 1315 { 1316 int cmd; 1317 unsigned long a; 1318 int i; 1319 struct bpt *bp; 1320 1321 cmd = inchar(); 1322 switch (cmd) { 1323 #ifndef CONFIG_PPC_8xx 1324 static const char badaddr[] = "Only kernel addresses are permitted for breakpoints\n"; 1325 int mode; 1326 case 'd': /* bd - hardware data breakpoint */ 1327 if (!ppc_breakpoint_available()) { 1328 printf("Hardware data breakpoint not supported on this cpu\n"); 1329 break; 1330 } 1331 mode = 7; 1332 cmd = inchar(); 1333 if (cmd == 'r') 1334 mode = 5; 1335 else if (cmd == 'w') 1336 mode = 6; 1337 else 1338 termch = cmd; 1339 dabr.address = 0; 1340 dabr.enabled = 0; 1341 if (scanhex(&dabr.address)) { 1342 if (!is_kernel_addr(dabr.address)) { 1343 printf(badaddr); 1344 break; 1345 } 1346 dabr.address &= ~HW_BRK_TYPE_DABR; 1347 dabr.enabled = mode | BP_DABR; 1348 } 1349 1350 force_enable_xmon(); 1351 break; 1352 1353 case 'i': /* bi - hardware instr breakpoint */ 1354 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) { 1355 printf("Hardware instruction breakpoint " 1356 "not supported on this cpu\n"); 1357 break; 1358 } 1359 if (iabr) { 1360 iabr->enabled &= ~BP_CIABR; 1361 iabr = NULL; 1362 } 1363 if (!scanhex(&a)) 1364 break; 1365 if (!check_bp_loc(a)) 1366 break; 1367 bp = new_breakpoint(a); 1368 if (bp != NULL) { 1369 bp->enabled |= BP_CIABR; 1370 iabr = bp; 1371 force_enable_xmon(); 1372 } 1373 break; 1374 #endif 1375 1376 case 'c': 1377 if (!scanhex(&a)) { 1378 /* clear all breakpoints */ 1379 for (i = 0; i < NBPTS; ++i) 1380 bpts[i].enabled = 0; 1381 iabr = NULL; 1382 dabr.enabled = 0; 1383 printf("All breakpoints cleared\n"); 1384 break; 1385 } 1386 1387 if (a <= NBPTS && a >= 1) { 1388 /* assume a breakpoint number */ 1389 bp = &bpts[a-1]; /* bp nums are 1 based */ 1390 } else { 1391 /* assume a breakpoint address */ 1392 bp = at_breakpoint(a); 1393 if (bp == NULL) { 1394 printf("No breakpoint at %lx\n", a); 1395 break; 1396 } 1397 } 1398 1399 printf("Cleared breakpoint %tx (", BP_NUM(bp)); 1400 xmon_print_symbol(bp->address, " ", ")\n"); 1401 bp->enabled = 0; 1402 break; 1403 1404 default: 1405 termch = cmd; 1406 cmd = skipbl(); 1407 if (cmd == '?') { 1408 printf(breakpoint_help_string); 1409 break; 1410 } 1411 termch = cmd; 1412 if (!scanhex(&a)) { 1413 /* print all breakpoints */ 1414 printf(" type address\n"); 1415 if (dabr.enabled) { 1416 printf(" data "REG" [", dabr.address); 1417 if (dabr.enabled & 1) 1418 printf("r"); 1419 if (dabr.enabled & 2) 1420 printf("w"); 1421 printf("]\n"); 1422 } 1423 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { 1424 if (!bp->enabled) 1425 continue; 1426 printf("%tx %s ", BP_NUM(bp), 1427 (bp->enabled & BP_CIABR) ? "inst": "trap"); 1428 xmon_print_symbol(bp->address, " ", "\n"); 1429 } 1430 break; 1431 } 1432 1433 if (!check_bp_loc(a)) 1434 break; 1435 bp = new_breakpoint(a); 1436 if (bp != NULL) { 1437 bp->enabled |= BP_TRAP; 1438 force_enable_xmon(); 1439 } 1440 break; 1441 } 1442 } 1443 1444 /* Very cheap human name for vector lookup. */ 1445 static 1446 const char *getvecname(unsigned long vec) 1447 { 1448 char *ret; 1449 1450 switch (vec) { 1451 case 0x100: ret = "(System Reset)"; break; 1452 case 0x200: ret = "(Machine Check)"; break; 1453 case 0x300: ret = "(Data Access)"; break; 1454 case 0x380: 1455 if (radix_enabled()) 1456 ret = "(Data Access Out of Range)"; 1457 else 1458 ret = "(Data SLB Access)"; 1459 break; 1460 case 0x400: ret = "(Instruction Access)"; break; 1461 case 0x480: 1462 if (radix_enabled()) 1463 ret = "(Instruction Access Out of Range)"; 1464 else 1465 ret = "(Instruction SLB Access)"; 1466 break; 1467 case 0x500: ret = "(Hardware Interrupt)"; break; 1468 case 0x600: ret = "(Alignment)"; break; 1469 case 0x700: ret = "(Program Check)"; break; 1470 case 0x800: ret = "(FPU Unavailable)"; break; 1471 case 0x900: ret = "(Decrementer)"; break; 1472 case 0x980: ret = "(Hypervisor Decrementer)"; break; 1473 case 0xa00: ret = "(Doorbell)"; break; 1474 case 0xc00: ret = "(System Call)"; break; 1475 case 0xd00: ret = "(Single Step)"; break; 1476 case 0xe40: ret = "(Emulation Assist)"; break; 1477 case 0xe60: ret = "(HMI)"; break; 1478 case 0xe80: ret = "(Hypervisor Doorbell)"; break; 1479 case 0xf00: ret = "(Performance Monitor)"; break; 1480 case 0xf20: ret = "(Altivec Unavailable)"; break; 1481 case 0x1300: ret = "(Instruction Breakpoint)"; break; 1482 case 0x1500: ret = "(Denormalisation)"; break; 1483 case 0x1700: ret = "(Altivec Assist)"; break; 1484 default: ret = ""; 1485 } 1486 return ret; 1487 } 1488 1489 static void get_function_bounds(unsigned long pc, unsigned long *startp, 1490 unsigned long *endp) 1491 { 1492 unsigned long size, offset; 1493 const char *name; 1494 1495 *startp = *endp = 0; 1496 if (pc == 0) 1497 return; 1498 if (setjmp(bus_error_jmp) == 0) { 1499 catch_memory_errors = 1; 1500 sync(); 1501 name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr); 1502 if (name != NULL) { 1503 *startp = pc - offset; 1504 *endp = pc - offset + size; 1505 } 1506 sync(); 1507 } 1508 catch_memory_errors = 0; 1509 } 1510 1511 #define LRSAVE_OFFSET (STACK_FRAME_LR_SAVE * sizeof(unsigned long)) 1512 #define MARKER_OFFSET (STACK_FRAME_MARKER * sizeof(unsigned long)) 1513 1514 static void xmon_show_stack(unsigned long sp, unsigned long lr, 1515 unsigned long pc) 1516 { 1517 int max_to_print = 64; 1518 unsigned long ip; 1519 unsigned long newsp; 1520 unsigned long marker; 1521 struct pt_regs regs; 1522 1523 while (max_to_print--) { 1524 if (!is_kernel_addr(sp)) { 1525 if (sp != 0) 1526 printf("SP (%lx) is in userspace\n", sp); 1527 break; 1528 } 1529 1530 if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long)) 1531 || !mread(sp, &newsp, sizeof(unsigned long))) { 1532 printf("Couldn't read stack frame at %lx\n", sp); 1533 break; 1534 } 1535 1536 /* 1537 * For the first stack frame, try to work out if 1538 * LR and/or the saved LR value in the bottommost 1539 * stack frame are valid. 1540 */ 1541 if ((pc | lr) != 0) { 1542 unsigned long fnstart, fnend; 1543 unsigned long nextip; 1544 int printip = 1; 1545 1546 get_function_bounds(pc, &fnstart, &fnend); 1547 nextip = 0; 1548 if (newsp > sp) 1549 mread(newsp + LRSAVE_OFFSET, &nextip, 1550 sizeof(unsigned long)); 1551 if (lr == ip) { 1552 if (!is_kernel_addr(lr) 1553 || (fnstart <= lr && lr < fnend)) 1554 printip = 0; 1555 } else if (lr == nextip) { 1556 printip = 0; 1557 } else if (is_kernel_addr(lr) 1558 && !(fnstart <= lr && lr < fnend)) { 1559 printf("[link register ] "); 1560 xmon_print_symbol(lr, " ", "\n"); 1561 } 1562 if (printip) { 1563 printf("["REG"] ", sp); 1564 xmon_print_symbol(ip, " ", " (unreliable)\n"); 1565 } 1566 pc = lr = 0; 1567 1568 } else { 1569 printf("["REG"] ", sp); 1570 xmon_print_symbol(ip, " ", "\n"); 1571 } 1572 1573 /* Look for "regshere" marker to see if this is 1574 an exception frame. */ 1575 if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long)) 1576 && marker == STACK_FRAME_REGS_MARKER) { 1577 if (mread(sp + STACK_FRAME_OVERHEAD, ®s, sizeof(regs)) 1578 != sizeof(regs)) { 1579 printf("Couldn't read registers at %lx\n", 1580 sp + STACK_FRAME_OVERHEAD); 1581 break; 1582 } 1583 printf("--- Exception: %lx %s at ", regs.trap, 1584 getvecname(TRAP(®s))); 1585 pc = regs.nip; 1586 lr = regs.link; 1587 xmon_print_symbol(pc, " ", "\n"); 1588 } 1589 1590 if (newsp == 0) 1591 break; 1592 1593 sp = newsp; 1594 } 1595 } 1596 1597 static void backtrace(struct pt_regs *excp) 1598 { 1599 unsigned long sp; 1600 1601 if (scanhex(&sp)) 1602 xmon_show_stack(sp, 0, 0); 1603 else 1604 xmon_show_stack(excp->gpr[1], excp->link, excp->nip); 1605 scannl(); 1606 } 1607 1608 static void print_bug_trap(struct pt_regs *regs) 1609 { 1610 #ifdef CONFIG_BUG 1611 const struct bug_entry *bug; 1612 unsigned long addr; 1613 1614 if (regs->msr & MSR_PR) 1615 return; /* not in kernel */ 1616 addr = regs->nip; /* address of trap instruction */ 1617 if (!is_kernel_addr(addr)) 1618 return; 1619 bug = find_bug(regs->nip); 1620 if (bug == NULL) 1621 return; 1622 if (is_warning_bug(bug)) 1623 return; 1624 1625 #ifdef CONFIG_DEBUG_BUGVERBOSE 1626 printf("kernel BUG at %s:%u!\n", 1627 bug->file, bug->line); 1628 #else 1629 printf("kernel BUG at %px!\n", (void *)bug->bug_addr); 1630 #endif 1631 #endif /* CONFIG_BUG */ 1632 } 1633 1634 static void excprint(struct pt_regs *fp) 1635 { 1636 unsigned long trap; 1637 1638 #ifdef CONFIG_SMP 1639 printf("cpu 0x%x: ", smp_processor_id()); 1640 #endif /* CONFIG_SMP */ 1641 1642 trap = TRAP(fp); 1643 printf("Vector: %lx %s at [%px]\n", fp->trap, getvecname(trap), fp); 1644 printf(" pc: "); 1645 xmon_print_symbol(fp->nip, ": ", "\n"); 1646 1647 printf(" lr: "); 1648 xmon_print_symbol(fp->link, ": ", "\n"); 1649 1650 printf(" sp: %lx\n", fp->gpr[1]); 1651 printf(" msr: %lx\n", fp->msr); 1652 1653 if (trap == 0x300 || trap == 0x380 || trap == 0x600 || trap == 0x200) { 1654 printf(" dar: %lx\n", fp->dar); 1655 if (trap != 0x380) 1656 printf(" dsisr: %lx\n", fp->dsisr); 1657 } 1658 1659 printf(" current = 0x%px\n", current); 1660 #ifdef CONFIG_PPC64 1661 printf(" paca = 0x%px\t irqmask: 0x%02x\t irq_happened: 0x%02x\n", 1662 local_paca, local_paca->irq_soft_mask, local_paca->irq_happened); 1663 #endif 1664 if (current) { 1665 printf(" pid = %d, comm = %s\n", 1666 current->pid, current->comm); 1667 } 1668 1669 if (trap == 0x700) 1670 print_bug_trap(fp); 1671 1672 printf(linux_banner); 1673 } 1674 1675 static void prregs(struct pt_regs *fp) 1676 { 1677 int n, trap; 1678 unsigned long base; 1679 struct pt_regs regs; 1680 1681 if (scanhex(&base)) { 1682 if (setjmp(bus_error_jmp) == 0) { 1683 catch_memory_errors = 1; 1684 sync(); 1685 regs = *(struct pt_regs *)base; 1686 sync(); 1687 __delay(200); 1688 } else { 1689 catch_memory_errors = 0; 1690 printf("*** Error reading registers from "REG"\n", 1691 base); 1692 return; 1693 } 1694 catch_memory_errors = 0; 1695 fp = ®s; 1696 } 1697 1698 #ifdef CONFIG_PPC64 1699 if (FULL_REGS(fp)) { 1700 for (n = 0; n < 16; ++n) 1701 printf("R%.2d = "REG" R%.2d = "REG"\n", 1702 n, fp->gpr[n], n+16, fp->gpr[n+16]); 1703 } else { 1704 for (n = 0; n < 7; ++n) 1705 printf("R%.2d = "REG" R%.2d = "REG"\n", 1706 n, fp->gpr[n], n+7, fp->gpr[n+7]); 1707 } 1708 #else 1709 for (n = 0; n < 32; ++n) { 1710 printf("R%.2d = %.8lx%s", n, fp->gpr[n], 1711 (n & 3) == 3? "\n": " "); 1712 if (n == 12 && !FULL_REGS(fp)) { 1713 printf("\n"); 1714 break; 1715 } 1716 } 1717 #endif 1718 printf("pc = "); 1719 xmon_print_symbol(fp->nip, " ", "\n"); 1720 if (TRAP(fp) != 0xc00 && cpu_has_feature(CPU_FTR_CFAR)) { 1721 printf("cfar= "); 1722 xmon_print_symbol(fp->orig_gpr3, " ", "\n"); 1723 } 1724 printf("lr = "); 1725 xmon_print_symbol(fp->link, " ", "\n"); 1726 printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr); 1727 printf("ctr = "REG" xer = "REG" trap = %4lx\n", 1728 fp->ctr, fp->xer, fp->trap); 1729 trap = TRAP(fp); 1730 if (trap == 0x300 || trap == 0x380 || trap == 0x600) 1731 printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr); 1732 } 1733 1734 static void cacheflush(void) 1735 { 1736 int cmd; 1737 unsigned long nflush; 1738 1739 cmd = inchar(); 1740 if (cmd != 'i') 1741 termch = cmd; 1742 scanhex((void *)&adrs); 1743 if (termch != '\n') 1744 termch = 0; 1745 nflush = 1; 1746 scanhex(&nflush); 1747 nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES; 1748 if (setjmp(bus_error_jmp) == 0) { 1749 catch_memory_errors = 1; 1750 sync(); 1751 1752 if (cmd != 'i') { 1753 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) 1754 cflush((void *) adrs); 1755 } else { 1756 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) 1757 cinval((void *) adrs); 1758 } 1759 sync(); 1760 /* wait a little while to see if we get a machine check */ 1761 __delay(200); 1762 } 1763 catch_memory_errors = 0; 1764 } 1765 1766 extern unsigned long xmon_mfspr(int spr, unsigned long default_value); 1767 extern void xmon_mtspr(int spr, unsigned long value); 1768 1769 static int 1770 read_spr(int n, unsigned long *vp) 1771 { 1772 unsigned long ret = -1UL; 1773 int ok = 0; 1774 1775 if (setjmp(bus_error_jmp) == 0) { 1776 catch_spr_faults = 1; 1777 sync(); 1778 1779 ret = xmon_mfspr(n, *vp); 1780 1781 sync(); 1782 *vp = ret; 1783 ok = 1; 1784 } 1785 catch_spr_faults = 0; 1786 1787 return ok; 1788 } 1789 1790 static void 1791 write_spr(int n, unsigned long val) 1792 { 1793 if (xmon_is_ro) { 1794 printf(xmon_ro_msg); 1795 return; 1796 } 1797 1798 if (setjmp(bus_error_jmp) == 0) { 1799 catch_spr_faults = 1; 1800 sync(); 1801 1802 xmon_mtspr(n, val); 1803 1804 sync(); 1805 } else { 1806 printf("SPR 0x%03x (%4d) Faulted during write\n", n, n); 1807 } 1808 catch_spr_faults = 0; 1809 } 1810 1811 static void dump_206_sprs(void) 1812 { 1813 #ifdef CONFIG_PPC64 1814 if (!cpu_has_feature(CPU_FTR_ARCH_206)) 1815 return; 1816 1817 /* Actually some of these pre-date 2.06, but whatevs */ 1818 1819 printf("srr0 = %.16lx srr1 = %.16lx dsisr = %.8lx\n", 1820 mfspr(SPRN_SRR0), mfspr(SPRN_SRR1), mfspr(SPRN_DSISR)); 1821 printf("dscr = %.16lx ppr = %.16lx pir = %.8lx\n", 1822 mfspr(SPRN_DSCR), mfspr(SPRN_PPR), mfspr(SPRN_PIR)); 1823 printf("amr = %.16lx uamor = %.16lx\n", 1824 mfspr(SPRN_AMR), mfspr(SPRN_UAMOR)); 1825 1826 if (!(mfmsr() & MSR_HV)) 1827 return; 1828 1829 printf("sdr1 = %.16lx hdar = %.16lx hdsisr = %.8lx\n", 1830 mfspr(SPRN_SDR1), mfspr(SPRN_HDAR), mfspr(SPRN_HDSISR)); 1831 printf("hsrr0 = %.16lx hsrr1 = %.16lx hdec = %.16lx\n", 1832 mfspr(SPRN_HSRR0), mfspr(SPRN_HSRR1), mfspr(SPRN_HDEC)); 1833 printf("lpcr = %.16lx pcr = %.16lx lpidr = %.8lx\n", 1834 mfspr(SPRN_LPCR), mfspr(SPRN_PCR), mfspr(SPRN_LPID)); 1835 printf("hsprg0 = %.16lx hsprg1 = %.16lx amor = %.16lx\n", 1836 mfspr(SPRN_HSPRG0), mfspr(SPRN_HSPRG1), mfspr(SPRN_AMOR)); 1837 printf("dabr = %.16lx dabrx = %.16lx\n", 1838 mfspr(SPRN_DABR), mfspr(SPRN_DABRX)); 1839 #endif 1840 } 1841 1842 static void dump_207_sprs(void) 1843 { 1844 #ifdef CONFIG_PPC64 1845 unsigned long msr; 1846 1847 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 1848 return; 1849 1850 printf("dpdes = %.16lx tir = %.16lx cir = %.8lx\n", 1851 mfspr(SPRN_DPDES), mfspr(SPRN_TIR), mfspr(SPRN_CIR)); 1852 1853 printf("fscr = %.16lx tar = %.16lx pspb = %.8lx\n", 1854 mfspr(SPRN_FSCR), mfspr(SPRN_TAR), mfspr(SPRN_PSPB)); 1855 1856 msr = mfmsr(); 1857 if (msr & MSR_TM) { 1858 /* Only if TM has been enabled in the kernel */ 1859 printf("tfhar = %.16lx tfiar = %.16lx texasr = %.16lx\n", 1860 mfspr(SPRN_TFHAR), mfspr(SPRN_TFIAR), 1861 mfspr(SPRN_TEXASR)); 1862 } 1863 1864 printf("mmcr0 = %.16lx mmcr1 = %.16lx mmcr2 = %.16lx\n", 1865 mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCR2)); 1866 printf("pmc1 = %.8lx pmc2 = %.8lx pmc3 = %.8lx pmc4 = %.8lx\n", 1867 mfspr(SPRN_PMC1), mfspr(SPRN_PMC2), 1868 mfspr(SPRN_PMC3), mfspr(SPRN_PMC4)); 1869 printf("mmcra = %.16lx siar = %.16lx pmc5 = %.8lx\n", 1870 mfspr(SPRN_MMCRA), mfspr(SPRN_SIAR), mfspr(SPRN_PMC5)); 1871 printf("sdar = %.16lx sier = %.16lx pmc6 = %.8lx\n", 1872 mfspr(SPRN_SDAR), mfspr(SPRN_SIER), mfspr(SPRN_PMC6)); 1873 printf("ebbhr = %.16lx ebbrr = %.16lx bescr = %.16lx\n", 1874 mfspr(SPRN_EBBHR), mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR)); 1875 printf("iamr = %.16lx\n", mfspr(SPRN_IAMR)); 1876 1877 if (!(msr & MSR_HV)) 1878 return; 1879 1880 printf("hfscr = %.16lx dhdes = %.16lx rpr = %.16lx\n", 1881 mfspr(SPRN_HFSCR), mfspr(SPRN_DHDES), mfspr(SPRN_RPR)); 1882 printf("dawr = %.16lx dawrx = %.16lx ciabr = %.16lx\n", 1883 mfspr(SPRN_DAWR), mfspr(SPRN_DAWRX), mfspr(SPRN_CIABR)); 1884 #endif 1885 } 1886 1887 static void dump_300_sprs(void) 1888 { 1889 #ifdef CONFIG_PPC64 1890 bool hv = mfmsr() & MSR_HV; 1891 1892 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 1893 return; 1894 1895 printf("pidr = %.16lx tidr = %.16lx\n", 1896 mfspr(SPRN_PID), mfspr(SPRN_TIDR)); 1897 printf("asdr = %.16lx psscr = %.16lx\n", 1898 mfspr(SPRN_ASDR), hv ? mfspr(SPRN_PSSCR) 1899 : mfspr(SPRN_PSSCR_PR)); 1900 1901 if (!hv) 1902 return; 1903 1904 printf("ptcr = %.16lx\n", 1905 mfspr(SPRN_PTCR)); 1906 #endif 1907 } 1908 1909 static void dump_one_spr(int spr, bool show_unimplemented) 1910 { 1911 unsigned long val; 1912 1913 val = 0xdeadbeef; 1914 if (!read_spr(spr, &val)) { 1915 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr); 1916 return; 1917 } 1918 1919 if (val == 0xdeadbeef) { 1920 /* Looks like read was a nop, confirm */ 1921 val = 0x0badcafe; 1922 if (!read_spr(spr, &val)) { 1923 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr); 1924 return; 1925 } 1926 1927 if (val == 0x0badcafe) { 1928 if (show_unimplemented) 1929 printf("SPR 0x%03x (%4d) Unimplemented\n", spr, spr); 1930 return; 1931 } 1932 } 1933 1934 printf("SPR 0x%03x (%4d) = 0x%lx\n", spr, spr, val); 1935 } 1936 1937 static void super_regs(void) 1938 { 1939 static unsigned long regno; 1940 int cmd; 1941 int spr; 1942 1943 cmd = skipbl(); 1944 1945 switch (cmd) { 1946 case '\n': { 1947 unsigned long sp, toc; 1948 asm("mr %0,1" : "=r" (sp) :); 1949 asm("mr %0,2" : "=r" (toc) :); 1950 1951 printf("msr = "REG" sprg0 = "REG"\n", 1952 mfmsr(), mfspr(SPRN_SPRG0)); 1953 printf("pvr = "REG" sprg1 = "REG"\n", 1954 mfspr(SPRN_PVR), mfspr(SPRN_SPRG1)); 1955 printf("dec = "REG" sprg2 = "REG"\n", 1956 mfspr(SPRN_DEC), mfspr(SPRN_SPRG2)); 1957 printf("sp = "REG" sprg3 = "REG"\n", sp, mfspr(SPRN_SPRG3)); 1958 printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR)); 1959 1960 dump_206_sprs(); 1961 dump_207_sprs(); 1962 dump_300_sprs(); 1963 1964 return; 1965 } 1966 case 'w': { 1967 unsigned long val; 1968 scanhex(®no); 1969 val = 0; 1970 read_spr(regno, &val); 1971 scanhex(&val); 1972 write_spr(regno, val); 1973 dump_one_spr(regno, true); 1974 break; 1975 } 1976 case 'r': 1977 scanhex(®no); 1978 dump_one_spr(regno, true); 1979 break; 1980 case 'a': 1981 /* dump ALL SPRs */ 1982 for (spr = 1; spr < 1024; ++spr) 1983 dump_one_spr(spr, false); 1984 break; 1985 } 1986 1987 scannl(); 1988 } 1989 1990 /* 1991 * Stuff for reading and writing memory safely 1992 */ 1993 static int 1994 mread(unsigned long adrs, void *buf, int size) 1995 { 1996 volatile int n; 1997 char *p, *q; 1998 1999 n = 0; 2000 if (setjmp(bus_error_jmp) == 0) { 2001 catch_memory_errors = 1; 2002 sync(); 2003 p = (char *)adrs; 2004 q = (char *)buf; 2005 switch (size) { 2006 case 2: 2007 *(u16 *)q = *(u16 *)p; 2008 break; 2009 case 4: 2010 *(u32 *)q = *(u32 *)p; 2011 break; 2012 case 8: 2013 *(u64 *)q = *(u64 *)p; 2014 break; 2015 default: 2016 for( ; n < size; ++n) { 2017 *q++ = *p++; 2018 sync(); 2019 } 2020 } 2021 sync(); 2022 /* wait a little while to see if we get a machine check */ 2023 __delay(200); 2024 n = size; 2025 } 2026 catch_memory_errors = 0; 2027 return n; 2028 } 2029 2030 static int 2031 mwrite(unsigned long adrs, void *buf, int size) 2032 { 2033 volatile int n; 2034 char *p, *q; 2035 2036 n = 0; 2037 2038 if (xmon_is_ro) { 2039 printf(xmon_ro_msg); 2040 return n; 2041 } 2042 2043 if (setjmp(bus_error_jmp) == 0) { 2044 catch_memory_errors = 1; 2045 sync(); 2046 p = (char *) adrs; 2047 q = (char *) buf; 2048 switch (size) { 2049 case 2: 2050 *(u16 *)p = *(u16 *)q; 2051 break; 2052 case 4: 2053 *(u32 *)p = *(u32 *)q; 2054 break; 2055 case 8: 2056 *(u64 *)p = *(u64 *)q; 2057 break; 2058 default: 2059 for ( ; n < size; ++n) { 2060 *p++ = *q++; 2061 sync(); 2062 } 2063 } 2064 sync(); 2065 /* wait a little while to see if we get a machine check */ 2066 __delay(200); 2067 n = size; 2068 } else { 2069 printf("*** Error writing address "REG"\n", adrs + n); 2070 } 2071 catch_memory_errors = 0; 2072 return n; 2073 } 2074 2075 static int fault_type; 2076 static int fault_except; 2077 static char *fault_chars[] = { "--", "**", "##" }; 2078 2079 static int handle_fault(struct pt_regs *regs) 2080 { 2081 fault_except = TRAP(regs); 2082 switch (TRAP(regs)) { 2083 case 0x200: 2084 fault_type = 0; 2085 break; 2086 case 0x300: 2087 case 0x380: 2088 fault_type = 1; 2089 break; 2090 default: 2091 fault_type = 2; 2092 } 2093 2094 longjmp(bus_error_jmp, 1); 2095 2096 return 0; 2097 } 2098 2099 #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t)) 2100 2101 static void 2102 byterev(unsigned char *val, int size) 2103 { 2104 int t; 2105 2106 switch (size) { 2107 case 2: 2108 SWAP(val[0], val[1], t); 2109 break; 2110 case 4: 2111 SWAP(val[0], val[3], t); 2112 SWAP(val[1], val[2], t); 2113 break; 2114 case 8: /* is there really any use for this? */ 2115 SWAP(val[0], val[7], t); 2116 SWAP(val[1], val[6], t); 2117 SWAP(val[2], val[5], t); 2118 SWAP(val[3], val[4], t); 2119 break; 2120 } 2121 } 2122 2123 static int brev; 2124 static int mnoread; 2125 2126 static char *memex_help_string = 2127 "Memory examine command usage:\n" 2128 "m [addr] [flags] examine/change memory\n" 2129 " addr is optional. will start where left off.\n" 2130 " flags may include chars from this set:\n" 2131 " b modify by bytes (default)\n" 2132 " w modify by words (2 byte)\n" 2133 " l modify by longs (4 byte)\n" 2134 " d modify by doubleword (8 byte)\n" 2135 " r toggle reverse byte order mode\n" 2136 " n do not read memory (for i/o spaces)\n" 2137 " . ok to read (default)\n" 2138 "NOTE: flags are saved as defaults\n" 2139 ""; 2140 2141 static char *memex_subcmd_help_string = 2142 "Memory examine subcommands:\n" 2143 " hexval write this val to current location\n" 2144 " 'string' write chars from string to this location\n" 2145 " ' increment address\n" 2146 " ^ decrement address\n" 2147 " / increment addr by 0x10. //=0x100, ///=0x1000, etc\n" 2148 " \\ decrement addr by 0x10. \\\\=0x100, \\\\\\=0x1000, etc\n" 2149 " ` clear no-read flag\n" 2150 " ; stay at this addr\n" 2151 " v change to byte mode\n" 2152 " w change to word (2 byte) mode\n" 2153 " l change to long (4 byte) mode\n" 2154 " u change to doubleword (8 byte) mode\n" 2155 " m addr change current addr\n" 2156 " n toggle no-read flag\n" 2157 " r toggle byte reverse flag\n" 2158 " < count back up count bytes\n" 2159 " > count skip forward count bytes\n" 2160 " x exit this mode\n" 2161 ""; 2162 2163 static void 2164 memex(void) 2165 { 2166 int cmd, inc, i, nslash; 2167 unsigned long n; 2168 unsigned char val[16]; 2169 2170 scanhex((void *)&adrs); 2171 cmd = skipbl(); 2172 if (cmd == '?') { 2173 printf(memex_help_string); 2174 return; 2175 } else { 2176 termch = cmd; 2177 } 2178 last_cmd = "m\n"; 2179 while ((cmd = skipbl()) != '\n') { 2180 switch( cmd ){ 2181 case 'b': size = 1; break; 2182 case 'w': size = 2; break; 2183 case 'l': size = 4; break; 2184 case 'd': size = 8; break; 2185 case 'r': brev = !brev; break; 2186 case 'n': mnoread = 1; break; 2187 case '.': mnoread = 0; break; 2188 } 2189 } 2190 if( size <= 0 ) 2191 size = 1; 2192 else if( size > 8 ) 2193 size = 8; 2194 for(;;){ 2195 if (!mnoread) 2196 n = mread(adrs, val, size); 2197 printf(REG"%c", adrs, brev? 'r': ' '); 2198 if (!mnoread) { 2199 if (brev) 2200 byterev(val, size); 2201 putchar(' '); 2202 for (i = 0; i < n; ++i) 2203 printf("%.2x", val[i]); 2204 for (; i < size; ++i) 2205 printf("%s", fault_chars[fault_type]); 2206 } 2207 putchar(' '); 2208 inc = size; 2209 nslash = 0; 2210 for(;;){ 2211 if( scanhex(&n) ){ 2212 for (i = 0; i < size; ++i) 2213 val[i] = n >> (i * 8); 2214 if (!brev) 2215 byterev(val, size); 2216 mwrite(adrs, val, size); 2217 inc = size; 2218 } 2219 cmd = skipbl(); 2220 if (cmd == '\n') 2221 break; 2222 inc = 0; 2223 switch (cmd) { 2224 case '\'': 2225 for(;;){ 2226 n = inchar(); 2227 if( n == '\\' ) 2228 n = bsesc(); 2229 else if( n == '\'' ) 2230 break; 2231 for (i = 0; i < size; ++i) 2232 val[i] = n >> (i * 8); 2233 if (!brev) 2234 byterev(val, size); 2235 mwrite(adrs, val, size); 2236 adrs += size; 2237 } 2238 adrs -= size; 2239 inc = size; 2240 break; 2241 case ',': 2242 adrs += size; 2243 break; 2244 case '.': 2245 mnoread = 0; 2246 break; 2247 case ';': 2248 break; 2249 case 'x': 2250 case EOF: 2251 scannl(); 2252 return; 2253 case 'b': 2254 case 'v': 2255 size = 1; 2256 break; 2257 case 'w': 2258 size = 2; 2259 break; 2260 case 'l': 2261 size = 4; 2262 break; 2263 case 'u': 2264 size = 8; 2265 break; 2266 case '^': 2267 adrs -= size; 2268 break; 2269 case '/': 2270 if (nslash > 0) 2271 adrs -= 1 << nslash; 2272 else 2273 nslash = 0; 2274 nslash += 4; 2275 adrs += 1 << nslash; 2276 break; 2277 case '\\': 2278 if (nslash < 0) 2279 adrs += 1 << -nslash; 2280 else 2281 nslash = 0; 2282 nslash -= 4; 2283 adrs -= 1 << -nslash; 2284 break; 2285 case 'm': 2286 scanhex((void *)&adrs); 2287 break; 2288 case 'n': 2289 mnoread = 1; 2290 break; 2291 case 'r': 2292 brev = !brev; 2293 break; 2294 case '<': 2295 n = size; 2296 scanhex(&n); 2297 adrs -= n; 2298 break; 2299 case '>': 2300 n = size; 2301 scanhex(&n); 2302 adrs += n; 2303 break; 2304 case '?': 2305 printf(memex_subcmd_help_string); 2306 break; 2307 } 2308 } 2309 adrs += inc; 2310 } 2311 } 2312 2313 static int 2314 bsesc(void) 2315 { 2316 int c; 2317 2318 c = inchar(); 2319 switch( c ){ 2320 case 'n': c = '\n'; break; 2321 case 'r': c = '\r'; break; 2322 case 'b': c = '\b'; break; 2323 case 't': c = '\t'; break; 2324 } 2325 return c; 2326 } 2327 2328 static void xmon_rawdump (unsigned long adrs, long ndump) 2329 { 2330 long n, m, r, nr; 2331 unsigned char temp[16]; 2332 2333 for (n = ndump; n > 0;) { 2334 r = n < 16? n: 16; 2335 nr = mread(adrs, temp, r); 2336 adrs += nr; 2337 for (m = 0; m < r; ++m) { 2338 if (m < nr) 2339 printf("%.2x", temp[m]); 2340 else 2341 printf("%s", fault_chars[fault_type]); 2342 } 2343 n -= r; 2344 if (nr < r) 2345 break; 2346 } 2347 printf("\n"); 2348 } 2349 2350 static void dump_tracing(void) 2351 { 2352 int c; 2353 2354 c = inchar(); 2355 if (c == 'c') 2356 ftrace_dump(DUMP_ORIG); 2357 else 2358 ftrace_dump(DUMP_ALL); 2359 } 2360 2361 #ifdef CONFIG_PPC64 2362 static void dump_one_paca(int cpu) 2363 { 2364 struct paca_struct *p; 2365 #ifdef CONFIG_PPC_BOOK3S_64 2366 int i = 0; 2367 #endif 2368 2369 if (setjmp(bus_error_jmp) != 0) { 2370 printf("*** Error dumping paca for cpu 0x%x!\n", cpu); 2371 return; 2372 } 2373 2374 catch_memory_errors = 1; 2375 sync(); 2376 2377 p = paca_ptrs[cpu]; 2378 2379 printf("paca for cpu 0x%x @ %px:\n", cpu, p); 2380 2381 printf(" %-*s = %s\n", 25, "possible", cpu_possible(cpu) ? "yes" : "no"); 2382 printf(" %-*s = %s\n", 25, "present", cpu_present(cpu) ? "yes" : "no"); 2383 printf(" %-*s = %s\n", 25, "online", cpu_online(cpu) ? "yes" : "no"); 2384 2385 #define DUMP(paca, name, format) \ 2386 printf(" %-*s = "format"\t(0x%lx)\n", 25, #name, 18, paca->name, \ 2387 offsetof(struct paca_struct, name)); 2388 2389 DUMP(p, lock_token, "%#-*x"); 2390 DUMP(p, paca_index, "%#-*x"); 2391 DUMP(p, kernel_toc, "%#-*llx"); 2392 DUMP(p, kernelbase, "%#-*llx"); 2393 DUMP(p, kernel_msr, "%#-*llx"); 2394 DUMP(p, emergency_sp, "%-*px"); 2395 #ifdef CONFIG_PPC_BOOK3S_64 2396 DUMP(p, nmi_emergency_sp, "%-*px"); 2397 DUMP(p, mc_emergency_sp, "%-*px"); 2398 DUMP(p, in_nmi, "%#-*x"); 2399 DUMP(p, in_mce, "%#-*x"); 2400 DUMP(p, hmi_event_available, "%#-*x"); 2401 #endif 2402 DUMP(p, data_offset, "%#-*llx"); 2403 DUMP(p, hw_cpu_id, "%#-*x"); 2404 DUMP(p, cpu_start, "%#-*x"); 2405 DUMP(p, kexec_state, "%#-*x"); 2406 #ifdef CONFIG_PPC_BOOK3S_64 2407 if (!early_radix_enabled()) { 2408 for (i = 0; i < SLB_NUM_BOLTED; i++) { 2409 u64 esid, vsid; 2410 2411 if (!p->slb_shadow_ptr) 2412 continue; 2413 2414 esid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].esid); 2415 vsid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].vsid); 2416 2417 if (esid || vsid) { 2418 printf(" %-*s[%d] = 0x%016llx 0x%016llx\n", 2419 22, "slb_shadow", i, esid, vsid); 2420 } 2421 } 2422 DUMP(p, vmalloc_sllp, "%#-*x"); 2423 DUMP(p, stab_rr, "%#-*x"); 2424 DUMP(p, slb_used_bitmap, "%#-*x"); 2425 DUMP(p, slb_kern_bitmap, "%#-*x"); 2426 2427 if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { 2428 DUMP(p, slb_cache_ptr, "%#-*x"); 2429 for (i = 0; i < SLB_CACHE_ENTRIES; i++) 2430 printf(" %-*s[%d] = 0x%016x\n", 2431 22, "slb_cache", i, p->slb_cache[i]); 2432 } 2433 } 2434 2435 DUMP(p, rfi_flush_fallback_area, "%-*px"); 2436 #endif 2437 DUMP(p, dscr_default, "%#-*llx"); 2438 #ifdef CONFIG_PPC_BOOK3E 2439 DUMP(p, pgd, "%-*px"); 2440 DUMP(p, kernel_pgd, "%-*px"); 2441 DUMP(p, tcd_ptr, "%-*px"); 2442 DUMP(p, mc_kstack, "%-*px"); 2443 DUMP(p, crit_kstack, "%-*px"); 2444 DUMP(p, dbg_kstack, "%-*px"); 2445 #endif 2446 DUMP(p, __current, "%-*px"); 2447 DUMP(p, kstack, "%#-*llx"); 2448 printf(" %-*s = 0x%016llx\n", 25, "kstack_base", p->kstack & ~(THREAD_SIZE - 1)); 2449 #ifdef CONFIG_STACKPROTECTOR 2450 DUMP(p, canary, "%#-*lx"); 2451 #endif 2452 DUMP(p, saved_r1, "%#-*llx"); 2453 #ifdef CONFIG_PPC_BOOK3E 2454 DUMP(p, trap_save, "%#-*x"); 2455 #endif 2456 DUMP(p, irq_soft_mask, "%#-*x"); 2457 DUMP(p, irq_happened, "%#-*x"); 2458 #ifdef CONFIG_MMIOWB 2459 DUMP(p, mmiowb_state.nesting_count, "%#-*x"); 2460 DUMP(p, mmiowb_state.mmiowb_pending, "%#-*x"); 2461 #endif 2462 DUMP(p, irq_work_pending, "%#-*x"); 2463 DUMP(p, sprg_vdso, "%#-*llx"); 2464 2465 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2466 DUMP(p, tm_scratch, "%#-*llx"); 2467 #endif 2468 2469 #ifdef CONFIG_PPC_POWERNV 2470 DUMP(p, idle_state, "%#-*lx"); 2471 if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { 2472 DUMP(p, thread_idle_state, "%#-*x"); 2473 DUMP(p, subcore_sibling_mask, "%#-*x"); 2474 } else { 2475 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 2476 DUMP(p, requested_psscr, "%#-*llx"); 2477 DUMP(p, dont_stop.counter, "%#-*x"); 2478 #endif 2479 } 2480 #endif 2481 2482 DUMP(p, accounting.utime, "%#-*lx"); 2483 DUMP(p, accounting.stime, "%#-*lx"); 2484 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME 2485 DUMP(p, accounting.utime_scaled, "%#-*lx"); 2486 #endif 2487 DUMP(p, accounting.starttime, "%#-*lx"); 2488 DUMP(p, accounting.starttime_user, "%#-*lx"); 2489 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME 2490 DUMP(p, accounting.startspurr, "%#-*lx"); 2491 DUMP(p, accounting.utime_sspurr, "%#-*lx"); 2492 #endif 2493 DUMP(p, accounting.steal_time, "%#-*lx"); 2494 #undef DUMP 2495 2496 catch_memory_errors = 0; 2497 sync(); 2498 } 2499 2500 static void dump_all_pacas(void) 2501 { 2502 int cpu; 2503 2504 if (num_possible_cpus() == 0) { 2505 printf("No possible cpus, use 'dp #' to dump individual cpus\n"); 2506 return; 2507 } 2508 2509 for_each_possible_cpu(cpu) 2510 dump_one_paca(cpu); 2511 } 2512 2513 static void dump_pacas(void) 2514 { 2515 unsigned long num; 2516 int c; 2517 2518 c = inchar(); 2519 if (c == 'a') { 2520 dump_all_pacas(); 2521 return; 2522 } 2523 2524 termch = c; /* Put c back, it wasn't 'a' */ 2525 2526 if (scanhex(&num)) 2527 dump_one_paca(num); 2528 else 2529 dump_one_paca(xmon_owner); 2530 } 2531 #endif 2532 2533 #ifdef CONFIG_PPC_POWERNV 2534 static void dump_one_xive(int cpu) 2535 { 2536 unsigned int hwid = get_hard_smp_processor_id(cpu); 2537 2538 opal_xive_dump(XIVE_DUMP_TM_HYP, hwid); 2539 opal_xive_dump(XIVE_DUMP_TM_POOL, hwid); 2540 opal_xive_dump(XIVE_DUMP_TM_OS, hwid); 2541 opal_xive_dump(XIVE_DUMP_TM_USER, hwid); 2542 opal_xive_dump(XIVE_DUMP_VP, hwid); 2543 opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid); 2544 2545 if (setjmp(bus_error_jmp) != 0) { 2546 catch_memory_errors = 0; 2547 printf("*** Error dumping xive on cpu %d\n", cpu); 2548 return; 2549 } 2550 2551 catch_memory_errors = 1; 2552 sync(); 2553 xmon_xive_do_dump(cpu); 2554 sync(); 2555 __delay(200); 2556 catch_memory_errors = 0; 2557 } 2558 2559 static void dump_all_xives(void) 2560 { 2561 int cpu; 2562 2563 if (num_possible_cpus() == 0) { 2564 printf("No possible cpus, use 'dx #' to dump individual cpus\n"); 2565 return; 2566 } 2567 2568 for_each_possible_cpu(cpu) 2569 dump_one_xive(cpu); 2570 } 2571 2572 static void dump_one_xive_irq(u32 num) 2573 { 2574 s64 rc; 2575 __be64 vp; 2576 u8 prio; 2577 __be32 lirq; 2578 2579 rc = opal_xive_get_irq_config(num, &vp, &prio, &lirq); 2580 xmon_printf("IRQ 0x%x config: vp=0x%llx prio=%d lirq=0x%x (rc=%lld)\n", 2581 num, be64_to_cpu(vp), prio, be32_to_cpu(lirq), rc); 2582 } 2583 2584 static void dump_xives(void) 2585 { 2586 unsigned long num; 2587 int c; 2588 2589 if (!xive_enabled()) { 2590 printf("Xive disabled on this system\n"); 2591 return; 2592 } 2593 2594 c = inchar(); 2595 if (c == 'a') { 2596 dump_all_xives(); 2597 return; 2598 } else if (c == 'i') { 2599 if (scanhex(&num)) 2600 dump_one_xive_irq(num); 2601 return; 2602 } 2603 2604 termch = c; /* Put c back, it wasn't 'a' */ 2605 2606 if (scanhex(&num)) 2607 dump_one_xive(num); 2608 else 2609 dump_one_xive(xmon_owner); 2610 } 2611 #endif /* CONFIG_PPC_POWERNV */ 2612 2613 static void dump_by_size(unsigned long addr, long count, int size) 2614 { 2615 unsigned char temp[16]; 2616 int i, j; 2617 u64 val; 2618 2619 count = ALIGN(count, 16); 2620 2621 for (i = 0; i < count; i += 16, addr += 16) { 2622 printf(REG, addr); 2623 2624 if (mread(addr, temp, 16) != 16) { 2625 printf("\nFaulted reading %d bytes from 0x"REG"\n", 16, addr); 2626 return; 2627 } 2628 2629 for (j = 0; j < 16; j += size) { 2630 putchar(' '); 2631 switch (size) { 2632 case 1: val = temp[j]; break; 2633 case 2: val = *(u16 *)&temp[j]; break; 2634 case 4: val = *(u32 *)&temp[j]; break; 2635 case 8: val = *(u64 *)&temp[j]; break; 2636 default: val = 0; 2637 } 2638 2639 printf("%0*llx", size * 2, val); 2640 } 2641 printf("\n"); 2642 } 2643 } 2644 2645 static void 2646 dump(void) 2647 { 2648 static char last[] = { "d?\n" }; 2649 int c; 2650 2651 c = inchar(); 2652 2653 #ifdef CONFIG_PPC64 2654 if (c == 'p') { 2655 xmon_start_pagination(); 2656 dump_pacas(); 2657 xmon_end_pagination(); 2658 return; 2659 } 2660 #endif 2661 #ifdef CONFIG_PPC_POWERNV 2662 if (c == 'x') { 2663 xmon_start_pagination(); 2664 dump_xives(); 2665 xmon_end_pagination(); 2666 return; 2667 } 2668 #endif 2669 2670 if (c == 't') { 2671 dump_tracing(); 2672 return; 2673 } 2674 2675 if (c == '\n') 2676 termch = c; 2677 2678 scanhex((void *)&adrs); 2679 if (termch != '\n') 2680 termch = 0; 2681 if (c == 'i') { 2682 scanhex(&nidump); 2683 if (nidump == 0) 2684 nidump = 16; 2685 else if (nidump > MAX_DUMP) 2686 nidump = MAX_DUMP; 2687 adrs += ppc_inst_dump(adrs, nidump, 1); 2688 last_cmd = "di\n"; 2689 } else if (c == 'l') { 2690 dump_log_buf(); 2691 } else if (c == 'o') { 2692 dump_opal_msglog(); 2693 } else if (c == 'v') { 2694 /* dump virtual to physical translation */ 2695 show_pte(adrs); 2696 } else if (c == 'r') { 2697 scanhex(&ndump); 2698 if (ndump == 0) 2699 ndump = 64; 2700 xmon_rawdump(adrs, ndump); 2701 adrs += ndump; 2702 last_cmd = "dr\n"; 2703 } else { 2704 scanhex(&ndump); 2705 if (ndump == 0) 2706 ndump = 64; 2707 else if (ndump > MAX_DUMP) 2708 ndump = MAX_DUMP; 2709 2710 switch (c) { 2711 case '8': 2712 case '4': 2713 case '2': 2714 case '1': 2715 ndump = ALIGN(ndump, 16); 2716 dump_by_size(adrs, ndump, c - '0'); 2717 last[1] = c; 2718 last_cmd = last; 2719 break; 2720 default: 2721 prdump(adrs, ndump); 2722 last_cmd = "d\n"; 2723 } 2724 2725 adrs += ndump; 2726 } 2727 } 2728 2729 static void 2730 prdump(unsigned long adrs, long ndump) 2731 { 2732 long n, m, c, r, nr; 2733 unsigned char temp[16]; 2734 2735 for (n = ndump; n > 0;) { 2736 printf(REG, adrs); 2737 putchar(' '); 2738 r = n < 16? n: 16; 2739 nr = mread(adrs, temp, r); 2740 adrs += nr; 2741 for (m = 0; m < r; ++m) { 2742 if ((m & (sizeof(long) - 1)) == 0 && m > 0) 2743 putchar(' '); 2744 if (m < nr) 2745 printf("%.2x", temp[m]); 2746 else 2747 printf("%s", fault_chars[fault_type]); 2748 } 2749 for (; m < 16; ++m) { 2750 if ((m & (sizeof(long) - 1)) == 0) 2751 putchar(' '); 2752 printf(" "); 2753 } 2754 printf(" |"); 2755 for (m = 0; m < r; ++m) { 2756 if (m < nr) { 2757 c = temp[m]; 2758 putchar(' ' <= c && c <= '~'? c: '.'); 2759 } else 2760 putchar(' '); 2761 } 2762 n -= r; 2763 for (; m < 16; ++m) 2764 putchar(' '); 2765 printf("|\n"); 2766 if (nr < r) 2767 break; 2768 } 2769 } 2770 2771 typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr); 2772 2773 static int 2774 generic_inst_dump(unsigned long adr, long count, int praddr, 2775 instruction_dump_func dump_func) 2776 { 2777 int nr, dotted; 2778 unsigned long first_adr; 2779 unsigned int inst, last_inst = 0; 2780 unsigned char val[4]; 2781 2782 dotted = 0; 2783 for (first_adr = adr; count > 0; --count, adr += 4) { 2784 nr = mread(adr, val, 4); 2785 if (nr == 0) { 2786 if (praddr) { 2787 const char *x = fault_chars[fault_type]; 2788 printf(REG" %s%s%s%s\n", adr, x, x, x, x); 2789 } 2790 break; 2791 } 2792 inst = GETWORD(val); 2793 if (adr > first_adr && inst == last_inst) { 2794 if (!dotted) { 2795 printf(" ...\n"); 2796 dotted = 1; 2797 } 2798 continue; 2799 } 2800 dotted = 0; 2801 last_inst = inst; 2802 if (praddr) 2803 printf(REG" %.8x", adr, inst); 2804 printf("\t"); 2805 dump_func(inst, adr); 2806 printf("\n"); 2807 } 2808 return adr - first_adr; 2809 } 2810 2811 static int 2812 ppc_inst_dump(unsigned long adr, long count, int praddr) 2813 { 2814 return generic_inst_dump(adr, count, praddr, print_insn_powerpc); 2815 } 2816 2817 void 2818 print_address(unsigned long addr) 2819 { 2820 xmon_print_symbol(addr, "\t# ", ""); 2821 } 2822 2823 static void 2824 dump_log_buf(void) 2825 { 2826 struct kmsg_dumper dumper = { .active = 1 }; 2827 unsigned char buf[128]; 2828 size_t len; 2829 2830 if (setjmp(bus_error_jmp) != 0) { 2831 printf("Error dumping printk buffer!\n"); 2832 return; 2833 } 2834 2835 catch_memory_errors = 1; 2836 sync(); 2837 2838 kmsg_dump_rewind_nolock(&dumper); 2839 xmon_start_pagination(); 2840 while (kmsg_dump_get_line_nolock(&dumper, false, buf, sizeof(buf), &len)) { 2841 buf[len] = '\0'; 2842 printf("%s", buf); 2843 } 2844 xmon_end_pagination(); 2845 2846 sync(); 2847 /* wait a little while to see if we get a machine check */ 2848 __delay(200); 2849 catch_memory_errors = 0; 2850 } 2851 2852 #ifdef CONFIG_PPC_POWERNV 2853 static void dump_opal_msglog(void) 2854 { 2855 unsigned char buf[128]; 2856 ssize_t res; 2857 loff_t pos = 0; 2858 2859 if (!firmware_has_feature(FW_FEATURE_OPAL)) { 2860 printf("Machine is not running OPAL firmware.\n"); 2861 return; 2862 } 2863 2864 if (setjmp(bus_error_jmp) != 0) { 2865 printf("Error dumping OPAL msglog!\n"); 2866 return; 2867 } 2868 2869 catch_memory_errors = 1; 2870 sync(); 2871 2872 xmon_start_pagination(); 2873 while ((res = opal_msglog_copy(buf, pos, sizeof(buf) - 1))) { 2874 if (res < 0) { 2875 printf("Error dumping OPAL msglog! Error: %zd\n", res); 2876 break; 2877 } 2878 buf[res] = '\0'; 2879 printf("%s", buf); 2880 pos += res; 2881 } 2882 xmon_end_pagination(); 2883 2884 sync(); 2885 /* wait a little while to see if we get a machine check */ 2886 __delay(200); 2887 catch_memory_errors = 0; 2888 } 2889 #endif 2890 2891 /* 2892 * Memory operations - move, set, print differences 2893 */ 2894 static unsigned long mdest; /* destination address */ 2895 static unsigned long msrc; /* source address */ 2896 static unsigned long mval; /* byte value to set memory to */ 2897 static unsigned long mcount; /* # bytes to affect */ 2898 static unsigned long mdiffs; /* max # differences to print */ 2899 2900 static void 2901 memops(int cmd) 2902 { 2903 scanhex((void *)&mdest); 2904 if( termch != '\n' ) 2905 termch = 0; 2906 scanhex((void *)(cmd == 's'? &mval: &msrc)); 2907 if( termch != '\n' ) 2908 termch = 0; 2909 scanhex((void *)&mcount); 2910 switch( cmd ){ 2911 case 'm': 2912 if (xmon_is_ro) { 2913 printf(xmon_ro_msg); 2914 break; 2915 } 2916 memmove((void *)mdest, (void *)msrc, mcount); 2917 break; 2918 case 's': 2919 if (xmon_is_ro) { 2920 printf(xmon_ro_msg); 2921 break; 2922 } 2923 memset((void *)mdest, mval, mcount); 2924 break; 2925 case 'd': 2926 if( termch != '\n' ) 2927 termch = 0; 2928 scanhex((void *)&mdiffs); 2929 memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs); 2930 break; 2931 } 2932 } 2933 2934 static void 2935 memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr) 2936 { 2937 unsigned n, prt; 2938 2939 prt = 0; 2940 for( n = nb; n > 0; --n ) 2941 if( *p1++ != *p2++ ) 2942 if( ++prt <= maxpr ) 2943 printf("%px %.2x # %px %.2x\n", p1 - 1, 2944 p1[-1], p2 - 1, p2[-1]); 2945 if( prt > maxpr ) 2946 printf("Total of %d differences\n", prt); 2947 } 2948 2949 static unsigned mend; 2950 static unsigned mask; 2951 2952 static void 2953 memlocate(void) 2954 { 2955 unsigned a, n; 2956 unsigned char val[4]; 2957 2958 last_cmd = "ml"; 2959 scanhex((void *)&mdest); 2960 if (termch != '\n') { 2961 termch = 0; 2962 scanhex((void *)&mend); 2963 if (termch != '\n') { 2964 termch = 0; 2965 scanhex((void *)&mval); 2966 mask = ~0; 2967 if (termch != '\n') termch = 0; 2968 scanhex((void *)&mask); 2969 } 2970 } 2971 n = 0; 2972 for (a = mdest; a < mend; a += 4) { 2973 if (mread(a, val, 4) == 4 2974 && ((GETWORD(val) ^ mval) & mask) == 0) { 2975 printf("%.16x: %.16x\n", a, GETWORD(val)); 2976 if (++n >= 10) 2977 break; 2978 } 2979 } 2980 } 2981 2982 static unsigned long mskip = 0x1000; 2983 static unsigned long mlim = 0xffffffff; 2984 2985 static void 2986 memzcan(void) 2987 { 2988 unsigned char v; 2989 unsigned a; 2990 int ok, ook; 2991 2992 scanhex(&mdest); 2993 if (termch != '\n') termch = 0; 2994 scanhex(&mskip); 2995 if (termch != '\n') termch = 0; 2996 scanhex(&mlim); 2997 ook = 0; 2998 for (a = mdest; a < mlim; a += mskip) { 2999 ok = mread(a, &v, 1); 3000 if (ok && !ook) { 3001 printf("%.8x .. ", a); 3002 } else if (!ok && ook) 3003 printf("%.8lx\n", a - mskip); 3004 ook = ok; 3005 if (a + mskip < a) 3006 break; 3007 } 3008 if (ook) 3009 printf("%.8lx\n", a - mskip); 3010 } 3011 3012 static void show_task(struct task_struct *tsk) 3013 { 3014 char state; 3015 3016 /* 3017 * Cloned from kdb_task_state_char(), which is not entirely 3018 * appropriate for calling from xmon. This could be moved 3019 * to a common, generic, routine used by both. 3020 */ 3021 state = (tsk->state == 0) ? 'R' : 3022 (tsk->state < 0) ? 'U' : 3023 (tsk->state & TASK_UNINTERRUPTIBLE) ? 'D' : 3024 (tsk->state & TASK_STOPPED) ? 'T' : 3025 (tsk->state & TASK_TRACED) ? 'C' : 3026 (tsk->exit_state & EXIT_ZOMBIE) ? 'Z' : 3027 (tsk->exit_state & EXIT_DEAD) ? 'E' : 3028 (tsk->state & TASK_INTERRUPTIBLE) ? 'S' : '?'; 3029 3030 printf("%px %016lx %6d %6d %c %2d %s\n", tsk, 3031 tsk->thread.ksp, 3032 tsk->pid, rcu_dereference(tsk->parent)->pid, 3033 state, task_cpu(tsk), 3034 tsk->comm); 3035 } 3036 3037 #ifdef CONFIG_PPC_BOOK3S_64 3038 static void format_pte(void *ptep, unsigned long pte) 3039 { 3040 pte_t entry = __pte(pte); 3041 3042 printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte); 3043 printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK); 3044 3045 printf("Flags = %s%s%s%s%s\n", 3046 pte_young(entry) ? "Accessed " : "", 3047 pte_dirty(entry) ? "Dirty " : "", 3048 pte_read(entry) ? "Read " : "", 3049 pte_write(entry) ? "Write " : "", 3050 pte_exec(entry) ? "Exec " : ""); 3051 } 3052 3053 static void show_pte(unsigned long addr) 3054 { 3055 unsigned long tskv = 0; 3056 struct task_struct *tsk = NULL; 3057 struct mm_struct *mm; 3058 pgd_t *pgdp, *pgdir; 3059 pud_t *pudp; 3060 pmd_t *pmdp; 3061 pte_t *ptep; 3062 3063 if (!scanhex(&tskv)) 3064 mm = &init_mm; 3065 else 3066 tsk = (struct task_struct *)tskv; 3067 3068 if (tsk == NULL) 3069 mm = &init_mm; 3070 else 3071 mm = tsk->active_mm; 3072 3073 if (setjmp(bus_error_jmp) != 0) { 3074 catch_memory_errors = 0; 3075 printf("*** Error dumping pte for task %px\n", tsk); 3076 return; 3077 } 3078 3079 catch_memory_errors = 1; 3080 sync(); 3081 3082 if (mm == &init_mm) { 3083 pgdp = pgd_offset_k(addr); 3084 pgdir = pgd_offset_k(0); 3085 } else { 3086 pgdp = pgd_offset(mm, addr); 3087 pgdir = pgd_offset(mm, 0); 3088 } 3089 3090 if (pgd_none(*pgdp)) { 3091 printf("no linux page table for address\n"); 3092 return; 3093 } 3094 3095 printf("pgd @ 0x%px\n", pgdir); 3096 3097 if (pgd_is_leaf(*pgdp)) { 3098 format_pte(pgdp, pgd_val(*pgdp)); 3099 return; 3100 } 3101 printf("pgdp @ 0x%px = 0x%016lx\n", pgdp, pgd_val(*pgdp)); 3102 3103 pudp = pud_offset(pgdp, addr); 3104 3105 if (pud_none(*pudp)) { 3106 printf("No valid PUD\n"); 3107 return; 3108 } 3109 3110 if (pud_is_leaf(*pudp)) { 3111 format_pte(pudp, pud_val(*pudp)); 3112 return; 3113 } 3114 3115 printf("pudp @ 0x%px = 0x%016lx\n", pudp, pud_val(*pudp)); 3116 3117 pmdp = pmd_offset(pudp, addr); 3118 3119 if (pmd_none(*pmdp)) { 3120 printf("No valid PMD\n"); 3121 return; 3122 } 3123 3124 if (pmd_is_leaf(*pmdp)) { 3125 format_pte(pmdp, pmd_val(*pmdp)); 3126 return; 3127 } 3128 printf("pmdp @ 0x%px = 0x%016lx\n", pmdp, pmd_val(*pmdp)); 3129 3130 ptep = pte_offset_map(pmdp, addr); 3131 if (pte_none(*ptep)) { 3132 printf("no valid PTE\n"); 3133 return; 3134 } 3135 3136 format_pte(ptep, pte_val(*ptep)); 3137 3138 sync(); 3139 __delay(200); 3140 catch_memory_errors = 0; 3141 } 3142 #else 3143 static void show_pte(unsigned long addr) 3144 { 3145 printf("show_pte not yet implemented\n"); 3146 } 3147 #endif /* CONFIG_PPC_BOOK3S_64 */ 3148 3149 static void show_tasks(void) 3150 { 3151 unsigned long tskv; 3152 struct task_struct *tsk = NULL; 3153 3154 printf(" task_struct ->thread.ksp PID PPID S P CMD\n"); 3155 3156 if (scanhex(&tskv)) 3157 tsk = (struct task_struct *)tskv; 3158 3159 if (setjmp(bus_error_jmp) != 0) { 3160 catch_memory_errors = 0; 3161 printf("*** Error dumping task %px\n", tsk); 3162 return; 3163 } 3164 3165 catch_memory_errors = 1; 3166 sync(); 3167 3168 if (tsk) 3169 show_task(tsk); 3170 else 3171 for_each_process(tsk) 3172 show_task(tsk); 3173 3174 sync(); 3175 __delay(200); 3176 catch_memory_errors = 0; 3177 } 3178 3179 static void proccall(void) 3180 { 3181 unsigned long args[8]; 3182 unsigned long ret; 3183 int i; 3184 typedef unsigned long (*callfunc_t)(unsigned long, unsigned long, 3185 unsigned long, unsigned long, unsigned long, 3186 unsigned long, unsigned long, unsigned long); 3187 callfunc_t func; 3188 3189 if (!scanhex(&adrs)) 3190 return; 3191 if (termch != '\n') 3192 termch = 0; 3193 for (i = 0; i < 8; ++i) 3194 args[i] = 0; 3195 for (i = 0; i < 8; ++i) { 3196 if (!scanhex(&args[i]) || termch == '\n') 3197 break; 3198 termch = 0; 3199 } 3200 func = (callfunc_t) adrs; 3201 ret = 0; 3202 if (setjmp(bus_error_jmp) == 0) { 3203 catch_memory_errors = 1; 3204 sync(); 3205 ret = func(args[0], args[1], args[2], args[3], 3206 args[4], args[5], args[6], args[7]); 3207 sync(); 3208 printf("return value is 0x%lx\n", ret); 3209 } else { 3210 printf("*** %x exception occurred\n", fault_except); 3211 } 3212 catch_memory_errors = 0; 3213 } 3214 3215 /* Input scanning routines */ 3216 int 3217 skipbl(void) 3218 { 3219 int c; 3220 3221 if( termch != 0 ){ 3222 c = termch; 3223 termch = 0; 3224 } else 3225 c = inchar(); 3226 while( c == ' ' || c == '\t' ) 3227 c = inchar(); 3228 return c; 3229 } 3230 3231 #define N_PTREGS 44 3232 static const char *regnames[N_PTREGS] = { 3233 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", 3234 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", 3235 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", 3236 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", 3237 "pc", "msr", "or3", "ctr", "lr", "xer", "ccr", 3238 #ifdef CONFIG_PPC64 3239 "softe", 3240 #else 3241 "mq", 3242 #endif 3243 "trap", "dar", "dsisr", "res" 3244 }; 3245 3246 int 3247 scanhex(unsigned long *vp) 3248 { 3249 int c, d; 3250 unsigned long v; 3251 3252 c = skipbl(); 3253 if (c == '%') { 3254 /* parse register name */ 3255 char regname[8]; 3256 int i; 3257 3258 for (i = 0; i < sizeof(regname) - 1; ++i) { 3259 c = inchar(); 3260 if (!isalnum(c)) { 3261 termch = c; 3262 break; 3263 } 3264 regname[i] = c; 3265 } 3266 regname[i] = 0; 3267 i = match_string(regnames, N_PTREGS, regname); 3268 if (i < 0) { 3269 printf("invalid register name '%%%s'\n", regname); 3270 return 0; 3271 } 3272 if (xmon_regs == NULL) { 3273 printf("regs not available\n"); 3274 return 0; 3275 } 3276 *vp = ((unsigned long *)xmon_regs)[i]; 3277 return 1; 3278 } 3279 3280 /* skip leading "0x" if any */ 3281 3282 if (c == '0') { 3283 c = inchar(); 3284 if (c == 'x') { 3285 c = inchar(); 3286 } else { 3287 d = hexdigit(c); 3288 if (d == EOF) { 3289 termch = c; 3290 *vp = 0; 3291 return 1; 3292 } 3293 } 3294 } else if (c == '$') { 3295 int i; 3296 for (i=0; i<63; i++) { 3297 c = inchar(); 3298 if (isspace(c) || c == '\0') { 3299 termch = c; 3300 break; 3301 } 3302 tmpstr[i] = c; 3303 } 3304 tmpstr[i++] = 0; 3305 *vp = 0; 3306 if (setjmp(bus_error_jmp) == 0) { 3307 catch_memory_errors = 1; 3308 sync(); 3309 *vp = kallsyms_lookup_name(tmpstr); 3310 sync(); 3311 } 3312 catch_memory_errors = 0; 3313 if (!(*vp)) { 3314 printf("unknown symbol '%s'\n", tmpstr); 3315 return 0; 3316 } 3317 return 1; 3318 } 3319 3320 d = hexdigit(c); 3321 if (d == EOF) { 3322 termch = c; 3323 return 0; 3324 } 3325 v = 0; 3326 do { 3327 v = (v << 4) + d; 3328 c = inchar(); 3329 d = hexdigit(c); 3330 } while (d != EOF); 3331 termch = c; 3332 *vp = v; 3333 return 1; 3334 } 3335 3336 static void 3337 scannl(void) 3338 { 3339 int c; 3340 3341 c = termch; 3342 termch = 0; 3343 while( c != '\n' ) 3344 c = inchar(); 3345 } 3346 3347 static int hexdigit(int c) 3348 { 3349 if( '0' <= c && c <= '9' ) 3350 return c - '0'; 3351 if( 'A' <= c && c <= 'F' ) 3352 return c - ('A' - 10); 3353 if( 'a' <= c && c <= 'f' ) 3354 return c - ('a' - 10); 3355 return EOF; 3356 } 3357 3358 void 3359 getstring(char *s, int size) 3360 { 3361 int c; 3362 3363 c = skipbl(); 3364 do { 3365 if( size > 1 ){ 3366 *s++ = c; 3367 --size; 3368 } 3369 c = inchar(); 3370 } while( c != ' ' && c != '\t' && c != '\n' ); 3371 termch = c; 3372 *s = 0; 3373 } 3374 3375 static char line[256]; 3376 static char *lineptr; 3377 3378 static void 3379 flush_input(void) 3380 { 3381 lineptr = NULL; 3382 } 3383 3384 static int 3385 inchar(void) 3386 { 3387 if (lineptr == NULL || *lineptr == 0) { 3388 if (xmon_gets(line, sizeof(line)) == NULL) { 3389 lineptr = NULL; 3390 return EOF; 3391 } 3392 lineptr = line; 3393 } 3394 return *lineptr++; 3395 } 3396 3397 static void 3398 take_input(char *str) 3399 { 3400 lineptr = str; 3401 } 3402 3403 3404 static void 3405 symbol_lookup(void) 3406 { 3407 int type = inchar(); 3408 unsigned long addr, cpu; 3409 void __percpu *ptr = NULL; 3410 static char tmp[64]; 3411 3412 switch (type) { 3413 case 'a': 3414 if (scanhex(&addr)) 3415 xmon_print_symbol(addr, ": ", "\n"); 3416 termch = 0; 3417 break; 3418 case 's': 3419 getstring(tmp, 64); 3420 if (setjmp(bus_error_jmp) == 0) { 3421 catch_memory_errors = 1; 3422 sync(); 3423 addr = kallsyms_lookup_name(tmp); 3424 if (addr) 3425 printf("%s: %lx\n", tmp, addr); 3426 else 3427 printf("Symbol '%s' not found.\n", tmp); 3428 sync(); 3429 } 3430 catch_memory_errors = 0; 3431 termch = 0; 3432 break; 3433 case 'p': 3434 getstring(tmp, 64); 3435 if (setjmp(bus_error_jmp) == 0) { 3436 catch_memory_errors = 1; 3437 sync(); 3438 ptr = (void __percpu *)kallsyms_lookup_name(tmp); 3439 sync(); 3440 } 3441 3442 if (ptr && 3443 ptr >= (void __percpu *)__per_cpu_start && 3444 ptr < (void __percpu *)__per_cpu_end) 3445 { 3446 if (scanhex(&cpu) && cpu < num_possible_cpus()) { 3447 addr = (unsigned long)per_cpu_ptr(ptr, cpu); 3448 } else { 3449 cpu = raw_smp_processor_id(); 3450 addr = (unsigned long)this_cpu_ptr(ptr); 3451 } 3452 3453 printf("%s for cpu 0x%lx: %lx\n", tmp, cpu, addr); 3454 } else { 3455 printf("Percpu symbol '%s' not found.\n", tmp); 3456 } 3457 3458 catch_memory_errors = 0; 3459 termch = 0; 3460 break; 3461 } 3462 } 3463 3464 3465 /* Print an address in numeric and symbolic form (if possible) */ 3466 static void xmon_print_symbol(unsigned long address, const char *mid, 3467 const char *after) 3468 { 3469 char *modname; 3470 const char *name = NULL; 3471 unsigned long offset, size; 3472 3473 printf(REG, address); 3474 if (setjmp(bus_error_jmp) == 0) { 3475 catch_memory_errors = 1; 3476 sync(); 3477 name = kallsyms_lookup(address, &size, &offset, &modname, 3478 tmpstr); 3479 sync(); 3480 /* wait a little while to see if we get a machine check */ 3481 __delay(200); 3482 } 3483 3484 catch_memory_errors = 0; 3485 3486 if (name) { 3487 printf("%s%s+%#lx/%#lx", mid, name, offset, size); 3488 if (modname) 3489 printf(" [%s]", modname); 3490 } 3491 printf("%s", after); 3492 } 3493 3494 #ifdef CONFIG_PPC_BOOK3S_64 3495 void dump_segments(void) 3496 { 3497 int i; 3498 unsigned long esid,vsid; 3499 unsigned long llp; 3500 3501 printf("SLB contents of cpu 0x%x\n", smp_processor_id()); 3502 3503 for (i = 0; i < mmu_slb_size; i++) { 3504 asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i)); 3505 asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i)); 3506 3507 if (!esid && !vsid) 3508 continue; 3509 3510 printf("%02d %016lx %016lx", i, esid, vsid); 3511 3512 if (!(esid & SLB_ESID_V)) { 3513 printf("\n"); 3514 continue; 3515 } 3516 3517 llp = vsid & SLB_VSID_LLP; 3518 if (vsid & SLB_VSID_B_1T) { 3519 printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n", 3520 GET_ESID_1T(esid), 3521 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T, 3522 llp); 3523 } else { 3524 printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n", 3525 GET_ESID(esid), 3526 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT, 3527 llp); 3528 } 3529 } 3530 } 3531 #endif 3532 3533 #ifdef CONFIG_PPC_BOOK3S_32 3534 void dump_segments(void) 3535 { 3536 int i; 3537 3538 printf("sr0-15 ="); 3539 for (i = 0; i < 16; ++i) 3540 printf(" %x", mfsrin(i << 28)); 3541 printf("\n"); 3542 } 3543 #endif 3544 3545 #ifdef CONFIG_44x 3546 static void dump_tlb_44x(void) 3547 { 3548 int i; 3549 3550 for (i = 0; i < PPC44x_TLB_SIZE; i++) { 3551 unsigned long w0,w1,w2; 3552 asm volatile("tlbre %0,%1,0" : "=r" (w0) : "r" (i)); 3553 asm volatile("tlbre %0,%1,1" : "=r" (w1) : "r" (i)); 3554 asm volatile("tlbre %0,%1,2" : "=r" (w2) : "r" (i)); 3555 printf("[%02x] %08lx %08lx %08lx ", i, w0, w1, w2); 3556 if (w0 & PPC44x_TLB_VALID) { 3557 printf("V %08lx -> %01lx%08lx %c%c%c%c%c", 3558 w0 & PPC44x_TLB_EPN_MASK, 3559 w1 & PPC44x_TLB_ERPN_MASK, 3560 w1 & PPC44x_TLB_RPN_MASK, 3561 (w2 & PPC44x_TLB_W) ? 'W' : 'w', 3562 (w2 & PPC44x_TLB_I) ? 'I' : 'i', 3563 (w2 & PPC44x_TLB_M) ? 'M' : 'm', 3564 (w2 & PPC44x_TLB_G) ? 'G' : 'g', 3565 (w2 & PPC44x_TLB_E) ? 'E' : 'e'); 3566 } 3567 printf("\n"); 3568 } 3569 } 3570 #endif /* CONFIG_44x */ 3571 3572 #ifdef CONFIG_PPC_BOOK3E 3573 static void dump_tlb_book3e(void) 3574 { 3575 u32 mmucfg, pidmask, lpidmask; 3576 u64 ramask; 3577 int i, tlb, ntlbs, pidsz, lpidsz, rasz, lrat = 0; 3578 int mmu_version; 3579 static const char *pgsz_names[] = { 3580 " 1K", 3581 " 2K", 3582 " 4K", 3583 " 8K", 3584 " 16K", 3585 " 32K", 3586 " 64K", 3587 "128K", 3588 "256K", 3589 "512K", 3590 " 1M", 3591 " 2M", 3592 " 4M", 3593 " 8M", 3594 " 16M", 3595 " 32M", 3596 " 64M", 3597 "128M", 3598 "256M", 3599 "512M", 3600 " 1G", 3601 " 2G", 3602 " 4G", 3603 " 8G", 3604 " 16G", 3605 " 32G", 3606 " 64G", 3607 "128G", 3608 "256G", 3609 "512G", 3610 " 1T", 3611 " 2T", 3612 }; 3613 3614 /* Gather some infos about the MMU */ 3615 mmucfg = mfspr(SPRN_MMUCFG); 3616 mmu_version = (mmucfg & 3) + 1; 3617 ntlbs = ((mmucfg >> 2) & 3) + 1; 3618 pidsz = ((mmucfg >> 6) & 0x1f) + 1; 3619 lpidsz = (mmucfg >> 24) & 0xf; 3620 rasz = (mmucfg >> 16) & 0x7f; 3621 if ((mmu_version > 1) && (mmucfg & 0x10000)) 3622 lrat = 1; 3623 printf("Book3E MMU MAV=%d.0,%d TLBs,%d-bit PID,%d-bit LPID,%d-bit RA\n", 3624 mmu_version, ntlbs, pidsz, lpidsz, rasz); 3625 pidmask = (1ul << pidsz) - 1; 3626 lpidmask = (1ul << lpidsz) - 1; 3627 ramask = (1ull << rasz) - 1; 3628 3629 for (tlb = 0; tlb < ntlbs; tlb++) { 3630 u32 tlbcfg; 3631 int nent, assoc, new_cc = 1; 3632 printf("TLB %d:\n------\n", tlb); 3633 switch(tlb) { 3634 case 0: 3635 tlbcfg = mfspr(SPRN_TLB0CFG); 3636 break; 3637 case 1: 3638 tlbcfg = mfspr(SPRN_TLB1CFG); 3639 break; 3640 case 2: 3641 tlbcfg = mfspr(SPRN_TLB2CFG); 3642 break; 3643 case 3: 3644 tlbcfg = mfspr(SPRN_TLB3CFG); 3645 break; 3646 default: 3647 printf("Unsupported TLB number !\n"); 3648 continue; 3649 } 3650 nent = tlbcfg & 0xfff; 3651 assoc = (tlbcfg >> 24) & 0xff; 3652 for (i = 0; i < nent; i++) { 3653 u32 mas0 = MAS0_TLBSEL(tlb); 3654 u32 mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K); 3655 u64 mas2 = 0; 3656 u64 mas7_mas3; 3657 int esel = i, cc = i; 3658 3659 if (assoc != 0) { 3660 cc = i / assoc; 3661 esel = i % assoc; 3662 mas2 = cc * 0x1000; 3663 } 3664 3665 mas0 |= MAS0_ESEL(esel); 3666 mtspr(SPRN_MAS0, mas0); 3667 mtspr(SPRN_MAS1, mas1); 3668 mtspr(SPRN_MAS2, mas2); 3669 asm volatile("tlbre 0,0,0" : : : "memory"); 3670 mas1 = mfspr(SPRN_MAS1); 3671 mas2 = mfspr(SPRN_MAS2); 3672 mas7_mas3 = mfspr(SPRN_MAS7_MAS3); 3673 if (assoc && (i % assoc) == 0) 3674 new_cc = 1; 3675 if (!(mas1 & MAS1_VALID)) 3676 continue; 3677 if (assoc == 0) 3678 printf("%04x- ", i); 3679 else if (new_cc) 3680 printf("%04x-%c", cc, 'A' + esel); 3681 else 3682 printf(" |%c", 'A' + esel); 3683 new_cc = 0; 3684 printf(" %016llx %04x %s %c%c AS%c", 3685 mas2 & ~0x3ffull, 3686 (mas1 >> 16) & 0x3fff, 3687 pgsz_names[(mas1 >> 7) & 0x1f], 3688 mas1 & MAS1_IND ? 'I' : ' ', 3689 mas1 & MAS1_IPROT ? 'P' : ' ', 3690 mas1 & MAS1_TS ? '1' : '0'); 3691 printf(" %c%c%c%c%c%c%c", 3692 mas2 & MAS2_X0 ? 'a' : ' ', 3693 mas2 & MAS2_X1 ? 'v' : ' ', 3694 mas2 & MAS2_W ? 'w' : ' ', 3695 mas2 & MAS2_I ? 'i' : ' ', 3696 mas2 & MAS2_M ? 'm' : ' ', 3697 mas2 & MAS2_G ? 'g' : ' ', 3698 mas2 & MAS2_E ? 'e' : ' '); 3699 printf(" %016llx", mas7_mas3 & ramask & ~0x7ffull); 3700 if (mas1 & MAS1_IND) 3701 printf(" %s\n", 3702 pgsz_names[(mas7_mas3 >> 1) & 0x1f]); 3703 else 3704 printf(" U%c%c%c S%c%c%c\n", 3705 mas7_mas3 & MAS3_UX ? 'x' : ' ', 3706 mas7_mas3 & MAS3_UW ? 'w' : ' ', 3707 mas7_mas3 & MAS3_UR ? 'r' : ' ', 3708 mas7_mas3 & MAS3_SX ? 'x' : ' ', 3709 mas7_mas3 & MAS3_SW ? 'w' : ' ', 3710 mas7_mas3 & MAS3_SR ? 'r' : ' '); 3711 } 3712 } 3713 } 3714 #endif /* CONFIG_PPC_BOOK3E */ 3715 3716 static void xmon_init(int enable) 3717 { 3718 if (enable) { 3719 __debugger = xmon; 3720 __debugger_ipi = xmon_ipi; 3721 __debugger_bpt = xmon_bpt; 3722 __debugger_sstep = xmon_sstep; 3723 __debugger_iabr_match = xmon_iabr_match; 3724 __debugger_break_match = xmon_break_match; 3725 __debugger_fault_handler = xmon_fault_handler; 3726 3727 #ifdef CONFIG_PPC_PSERIES 3728 /* 3729 * Get the token here to avoid trying to get a lock 3730 * during the crash, causing a deadlock. 3731 */ 3732 set_indicator_token = rtas_token("set-indicator"); 3733 #endif 3734 } else { 3735 __debugger = NULL; 3736 __debugger_ipi = NULL; 3737 __debugger_bpt = NULL; 3738 __debugger_sstep = NULL; 3739 __debugger_iabr_match = NULL; 3740 __debugger_break_match = NULL; 3741 __debugger_fault_handler = NULL; 3742 } 3743 } 3744 3745 #ifdef CONFIG_MAGIC_SYSRQ 3746 static void sysrq_handle_xmon(int key) 3747 { 3748 /* ensure xmon is enabled */ 3749 xmon_init(1); 3750 debugger(get_irq_regs()); 3751 if (!xmon_on) 3752 xmon_init(0); 3753 } 3754 3755 static struct sysrq_key_op sysrq_xmon_op = { 3756 .handler = sysrq_handle_xmon, 3757 .help_msg = "xmon(x)", 3758 .action_msg = "Entering xmon", 3759 }; 3760 3761 static int __init setup_xmon_sysrq(void) 3762 { 3763 register_sysrq_key('x', &sysrq_xmon_op); 3764 return 0; 3765 } 3766 device_initcall(setup_xmon_sysrq); 3767 #endif /* CONFIG_MAGIC_SYSRQ */ 3768 3769 #ifdef CONFIG_DEBUG_FS 3770 static void clear_all_bpt(void) 3771 { 3772 int i; 3773 3774 /* clear/unpatch all breakpoints */ 3775 remove_bpts(); 3776 remove_cpu_bpts(); 3777 3778 /* Disable all breakpoints */ 3779 for (i = 0; i < NBPTS; ++i) 3780 bpts[i].enabled = 0; 3781 3782 /* Clear any data or iabr breakpoints */ 3783 if (iabr || dabr.enabled) { 3784 iabr = NULL; 3785 dabr.enabled = 0; 3786 } 3787 3788 printf("xmon: All breakpoints cleared\n"); 3789 } 3790 3791 static int xmon_dbgfs_set(void *data, u64 val) 3792 { 3793 xmon_on = !!val; 3794 xmon_init(xmon_on); 3795 3796 /* make sure all breakpoints removed when disabling */ 3797 if (!xmon_on) 3798 clear_all_bpt(); 3799 return 0; 3800 } 3801 3802 static int xmon_dbgfs_get(void *data, u64 *val) 3803 { 3804 *val = xmon_on; 3805 return 0; 3806 } 3807 3808 DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get, 3809 xmon_dbgfs_set, "%llu\n"); 3810 3811 static int __init setup_xmon_dbgfs(void) 3812 { 3813 debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL, 3814 &xmon_dbgfs_ops); 3815 return 0; 3816 } 3817 device_initcall(setup_xmon_dbgfs); 3818 #endif /* CONFIG_DEBUG_FS */ 3819 3820 static int xmon_early __initdata; 3821 3822 static int __init early_parse_xmon(char *p) 3823 { 3824 if (!p || strncmp(p, "early", 5) == 0) { 3825 /* just "xmon" is equivalent to "xmon=early" */ 3826 xmon_init(1); 3827 xmon_early = 1; 3828 xmon_on = 1; 3829 } else if (strncmp(p, "on", 2) == 0) { 3830 xmon_init(1); 3831 xmon_on = 1; 3832 } else if (strncmp(p, "rw", 2) == 0) { 3833 xmon_init(1); 3834 xmon_on = 1; 3835 xmon_is_ro = false; 3836 } else if (strncmp(p, "ro", 2) == 0) { 3837 xmon_init(1); 3838 xmon_on = 1; 3839 xmon_is_ro = true; 3840 } else if (strncmp(p, "off", 3) == 0) 3841 xmon_on = 0; 3842 else 3843 return 1; 3844 3845 return 0; 3846 } 3847 early_param("xmon", early_parse_xmon); 3848 3849 void __init xmon_setup(void) 3850 { 3851 if (xmon_on) 3852 xmon_init(1); 3853 if (xmon_early) 3854 debugger(NULL); 3855 } 3856 3857 #ifdef CONFIG_SPU_BASE 3858 3859 struct spu_info { 3860 struct spu *spu; 3861 u64 saved_mfc_sr1_RW; 3862 u32 saved_spu_runcntl_RW; 3863 unsigned long dump_addr; 3864 u8 stopped_ok; 3865 }; 3866 3867 #define XMON_NUM_SPUS 16 /* Enough for current hardware */ 3868 3869 static struct spu_info spu_info[XMON_NUM_SPUS]; 3870 3871 void xmon_register_spus(struct list_head *list) 3872 { 3873 struct spu *spu; 3874 3875 list_for_each_entry(spu, list, full_list) { 3876 if (spu->number >= XMON_NUM_SPUS) { 3877 WARN_ON(1); 3878 continue; 3879 } 3880 3881 spu_info[spu->number].spu = spu; 3882 spu_info[spu->number].stopped_ok = 0; 3883 spu_info[spu->number].dump_addr = (unsigned long) 3884 spu_info[spu->number].spu->local_store; 3885 } 3886 } 3887 3888 static void stop_spus(void) 3889 { 3890 struct spu *spu; 3891 int i; 3892 u64 tmp; 3893 3894 for (i = 0; i < XMON_NUM_SPUS; i++) { 3895 if (!spu_info[i].spu) 3896 continue; 3897 3898 if (setjmp(bus_error_jmp) == 0) { 3899 catch_memory_errors = 1; 3900 sync(); 3901 3902 spu = spu_info[i].spu; 3903 3904 spu_info[i].saved_spu_runcntl_RW = 3905 in_be32(&spu->problem->spu_runcntl_RW); 3906 3907 tmp = spu_mfc_sr1_get(spu); 3908 spu_info[i].saved_mfc_sr1_RW = tmp; 3909 3910 tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK; 3911 spu_mfc_sr1_set(spu, tmp); 3912 3913 sync(); 3914 __delay(200); 3915 3916 spu_info[i].stopped_ok = 1; 3917 3918 printf("Stopped spu %.2d (was %s)\n", i, 3919 spu_info[i].saved_spu_runcntl_RW ? 3920 "running" : "stopped"); 3921 } else { 3922 catch_memory_errors = 0; 3923 printf("*** Error stopping spu %.2d\n", i); 3924 } 3925 catch_memory_errors = 0; 3926 } 3927 } 3928 3929 static void restart_spus(void) 3930 { 3931 struct spu *spu; 3932 int i; 3933 3934 for (i = 0; i < XMON_NUM_SPUS; i++) { 3935 if (!spu_info[i].spu) 3936 continue; 3937 3938 if (!spu_info[i].stopped_ok) { 3939 printf("*** Error, spu %d was not successfully stopped" 3940 ", not restarting\n", i); 3941 continue; 3942 } 3943 3944 if (setjmp(bus_error_jmp) == 0) { 3945 catch_memory_errors = 1; 3946 sync(); 3947 3948 spu = spu_info[i].spu; 3949 spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW); 3950 out_be32(&spu->problem->spu_runcntl_RW, 3951 spu_info[i].saved_spu_runcntl_RW); 3952 3953 sync(); 3954 __delay(200); 3955 3956 printf("Restarted spu %.2d\n", i); 3957 } else { 3958 catch_memory_errors = 0; 3959 printf("*** Error restarting spu %.2d\n", i); 3960 } 3961 catch_memory_errors = 0; 3962 } 3963 } 3964 3965 #define DUMP_WIDTH 23 3966 #define DUMP_VALUE(format, field, value) \ 3967 do { \ 3968 if (setjmp(bus_error_jmp) == 0) { \ 3969 catch_memory_errors = 1; \ 3970 sync(); \ 3971 printf(" %-*s = "format"\n", DUMP_WIDTH, \ 3972 #field, value); \ 3973 sync(); \ 3974 __delay(200); \ 3975 } else { \ 3976 catch_memory_errors = 0; \ 3977 printf(" %-*s = *** Error reading field.\n", \ 3978 DUMP_WIDTH, #field); \ 3979 } \ 3980 catch_memory_errors = 0; \ 3981 } while (0) 3982 3983 #define DUMP_FIELD(obj, format, field) \ 3984 DUMP_VALUE(format, field, obj->field) 3985 3986 static void dump_spu_fields(struct spu *spu) 3987 { 3988 printf("Dumping spu fields at address %p:\n", spu); 3989 3990 DUMP_FIELD(spu, "0x%x", number); 3991 DUMP_FIELD(spu, "%s", name); 3992 DUMP_FIELD(spu, "0x%lx", local_store_phys); 3993 DUMP_FIELD(spu, "0x%p", local_store); 3994 DUMP_FIELD(spu, "0x%lx", ls_size); 3995 DUMP_FIELD(spu, "0x%x", node); 3996 DUMP_FIELD(spu, "0x%lx", flags); 3997 DUMP_FIELD(spu, "%llu", class_0_pending); 3998 DUMP_FIELD(spu, "0x%llx", class_0_dar); 3999 DUMP_FIELD(spu, "0x%llx", class_1_dar); 4000 DUMP_FIELD(spu, "0x%llx", class_1_dsisr); 4001 DUMP_FIELD(spu, "0x%x", irqs[0]); 4002 DUMP_FIELD(spu, "0x%x", irqs[1]); 4003 DUMP_FIELD(spu, "0x%x", irqs[2]); 4004 DUMP_FIELD(spu, "0x%x", slb_replace); 4005 DUMP_FIELD(spu, "%d", pid); 4006 DUMP_FIELD(spu, "0x%p", mm); 4007 DUMP_FIELD(spu, "0x%p", ctx); 4008 DUMP_FIELD(spu, "0x%p", rq); 4009 DUMP_FIELD(spu, "0x%llx", timestamp); 4010 DUMP_FIELD(spu, "0x%lx", problem_phys); 4011 DUMP_FIELD(spu, "0x%p", problem); 4012 DUMP_VALUE("0x%x", problem->spu_runcntl_RW, 4013 in_be32(&spu->problem->spu_runcntl_RW)); 4014 DUMP_VALUE("0x%x", problem->spu_status_R, 4015 in_be32(&spu->problem->spu_status_R)); 4016 DUMP_VALUE("0x%x", problem->spu_npc_RW, 4017 in_be32(&spu->problem->spu_npc_RW)); 4018 DUMP_FIELD(spu, "0x%p", priv2); 4019 DUMP_FIELD(spu, "0x%p", pdata); 4020 } 4021 4022 int 4023 spu_inst_dump(unsigned long adr, long count, int praddr) 4024 { 4025 return generic_inst_dump(adr, count, praddr, print_insn_spu); 4026 } 4027 4028 static void dump_spu_ls(unsigned long num, int subcmd) 4029 { 4030 unsigned long offset, addr, ls_addr; 4031 4032 if (setjmp(bus_error_jmp) == 0) { 4033 catch_memory_errors = 1; 4034 sync(); 4035 ls_addr = (unsigned long)spu_info[num].spu->local_store; 4036 sync(); 4037 __delay(200); 4038 } else { 4039 catch_memory_errors = 0; 4040 printf("*** Error: accessing spu info for spu %ld\n", num); 4041 return; 4042 } 4043 catch_memory_errors = 0; 4044 4045 if (scanhex(&offset)) 4046 addr = ls_addr + offset; 4047 else 4048 addr = spu_info[num].dump_addr; 4049 4050 if (addr >= ls_addr + LS_SIZE) { 4051 printf("*** Error: address outside of local store\n"); 4052 return; 4053 } 4054 4055 switch (subcmd) { 4056 case 'i': 4057 addr += spu_inst_dump(addr, 16, 1); 4058 last_cmd = "sdi\n"; 4059 break; 4060 default: 4061 prdump(addr, 64); 4062 addr += 64; 4063 last_cmd = "sd\n"; 4064 break; 4065 } 4066 4067 spu_info[num].dump_addr = addr; 4068 } 4069 4070 static int do_spu_cmd(void) 4071 { 4072 static unsigned long num = 0; 4073 int cmd, subcmd = 0; 4074 4075 cmd = inchar(); 4076 switch (cmd) { 4077 case 's': 4078 stop_spus(); 4079 break; 4080 case 'r': 4081 restart_spus(); 4082 break; 4083 case 'd': 4084 subcmd = inchar(); 4085 if (isxdigit(subcmd) || subcmd == '\n') 4086 termch = subcmd; 4087 /* fall through */ 4088 case 'f': 4089 scanhex(&num); 4090 if (num >= XMON_NUM_SPUS || !spu_info[num].spu) { 4091 printf("*** Error: invalid spu number\n"); 4092 return 0; 4093 } 4094 4095 switch (cmd) { 4096 case 'f': 4097 dump_spu_fields(spu_info[num].spu); 4098 break; 4099 default: 4100 dump_spu_ls(num, subcmd); 4101 break; 4102 } 4103 4104 break; 4105 default: 4106 return -1; 4107 } 4108 4109 return 0; 4110 } 4111 #else /* ! CONFIG_SPU_BASE */ 4112 static int do_spu_cmd(void) 4113 { 4114 return -1; 4115 } 4116 #endif 4117