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 #include <linux/security.h>
29
30 #include <asm/debugfs.h>
31 #include <asm/ptrace.h>
32 #include <asm/smp.h>
33 #include <asm/string.h>
34 #include <asm/prom.h>
35 #include <asm/machdep.h>
36 #include <asm/xmon.h>
37 #include <asm/processor.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 #include <asm/inst.h>
57
58 #ifdef CONFIG_PPC64
59 #include <asm/hvcall.h>
60 #include <asm/paca.h>
61 #endif
62
63 #include "nonstdio.h"
64 #include "dis-asm.h"
65 #include "xmon_bpts.h"
66
67 #ifdef CONFIG_SMP
68 static cpumask_t cpus_in_xmon = CPU_MASK_NONE;
69 static unsigned long xmon_taken = 1;
70 static int xmon_owner;
71 static int xmon_gate;
72 #else
73 #define xmon_owner 0
74 #endif /* CONFIG_SMP */
75
76 #ifdef CONFIG_PPC_PSERIES
77 static int set_indicator_token = RTAS_UNKNOWN_SERVICE;
78 #endif
79 static unsigned long in_xmon __read_mostly = 0;
80 static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT);
81 static bool xmon_is_ro = IS_ENABLED(CONFIG_XMON_DEFAULT_RO_MODE);
82
83 static unsigned long adrs;
84 static int size = 1;
85 #define MAX_DUMP (64 * 1024)
86 static unsigned long ndump = 64;
87 #define MAX_IDUMP (MAX_DUMP >> 2)
88 static unsigned long nidump = 16;
89 static unsigned long ncsum = 4096;
90 static int termch;
91 static char tmpstr[128];
92 static int tracing_enabled;
93
94 static long bus_error_jmp[JMP_BUF_LEN];
95 static int catch_memory_errors;
96 static int catch_spr_faults;
97 static long *xmon_fault_jmp[NR_CPUS];
98
99 /* Breakpoint stuff */
100 struct bpt {
101 unsigned long address;
102 struct ppc_inst *instr;
103 atomic_t ref_count;
104 int enabled;
105 unsigned long pad;
106 };
107
108 /* Bits in bpt.enabled */
109 #define BP_CIABR 1
110 #define BP_TRAP 2
111 #define BP_DABR 4
112
113 static struct bpt bpts[NBPTS];
114 static struct bpt dabr[HBP_NUM_MAX];
115 static struct bpt *iabr;
116 static unsigned bpinstr = 0x7fe00008; /* trap */
117
118 #define BP_NUM(bp) ((bp) - bpts + 1)
119
120 /* Prototypes */
121 static int cmds(struct pt_regs *);
122 static int mread(unsigned long, void *, int);
123 static int mwrite(unsigned long, void *, int);
124 static int mread_instr(unsigned long, struct ppc_inst *);
125 static int handle_fault(struct pt_regs *);
126 static void byterev(unsigned char *, int);
127 static void memex(void);
128 static int bsesc(void);
129 static void dump(void);
130 static void show_pte(unsigned long);
131 static void prdump(unsigned long, long);
132 static int ppc_inst_dump(unsigned long, long, int);
133 static void dump_log_buf(void);
134
135 #ifdef CONFIG_PPC_POWERNV
136 static void dump_opal_msglog(void);
137 #else
dump_opal_msglog(void)138 static inline void dump_opal_msglog(void)
139 {
140 printf("Machine is not running OPAL firmware.\n");
141 }
142 #endif
143
144 static void backtrace(struct pt_regs *);
145 static void excprint(struct pt_regs *);
146 static void prregs(struct pt_regs *);
147 static void memops(int);
148 static void memlocate(void);
149 static void memzcan(void);
150 static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned);
151 int skipbl(void);
152 int scanhex(unsigned long *valp);
153 static void scannl(void);
154 static int hexdigit(int);
155 void getstring(char *, int);
156 static void flush_input(void);
157 static int inchar(void);
158 static void take_input(char *);
159 static int read_spr(int, unsigned long *);
160 static void write_spr(int, unsigned long);
161 static void super_regs(void);
162 static void remove_bpts(void);
163 static void insert_bpts(void);
164 static void remove_cpu_bpts(void);
165 static void insert_cpu_bpts(void);
166 static struct bpt *at_breakpoint(unsigned long pc);
167 static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp);
168 static int do_step(struct pt_regs *);
169 static void bpt_cmds(void);
170 static void cacheflush(void);
171 static int cpu_cmd(void);
172 static void csum(void);
173 static void bootcmds(void);
174 static void proccall(void);
175 static void show_tasks(void);
176 void dump_segments(void);
177 static void symbol_lookup(void);
178 static void xmon_show_stack(unsigned long sp, unsigned long lr,
179 unsigned long pc);
180 static void xmon_print_symbol(unsigned long address, const char *mid,
181 const char *after);
182 static const char *getvecname(unsigned long vec);
183
184 static int do_spu_cmd(void);
185
186 #ifdef CONFIG_44x
187 static void dump_tlb_44x(void);
188 #endif
189 #ifdef CONFIG_PPC_BOOK3E
190 static void dump_tlb_book3e(void);
191 #endif
192
193 static void clear_all_bpt(void);
194
195 #ifdef CONFIG_PPC64
196 #define REG "%.16lx"
197 #else
198 #define REG "%.8lx"
199 #endif
200
201 #ifdef __LITTLE_ENDIAN__
202 #define GETWORD(v) (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0])
203 #else
204 #define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])
205 #endif
206
207 static const char *xmon_ro_msg = "Operation disabled: xmon in read-only mode\n";
208
209 static char *help_string = "\
210 Commands:\n\
211 b show breakpoints\n\
212 bd set data breakpoint\n\
213 bi set instruction breakpoint\n\
214 bc clear breakpoint\n"
215 #ifdef CONFIG_SMP
216 "\
217 c print cpus stopped in xmon\n\
218 c# try to switch to cpu number h (in hex)\n"
219 #endif
220 "\
221 C checksum\n\
222 d dump bytes\n\
223 d1 dump 1 byte values\n\
224 d2 dump 2 byte values\n\
225 d4 dump 4 byte values\n\
226 d8 dump 8 byte values\n\
227 di dump instructions\n\
228 df dump float values\n\
229 dd dump double values\n\
230 dl dump the kernel log buffer\n"
231 #ifdef CONFIG_PPC_POWERNV
232 "\
233 do dump the OPAL message log\n"
234 #endif
235 #ifdef CONFIG_PPC64
236 "\
237 dp[#] dump paca for current cpu, or cpu #\n\
238 dpa dump paca for all possible cpus\n"
239 #endif
240 "\
241 dr dump stream of raw bytes\n\
242 dv dump virtual address translation \n\
243 dt dump the tracing buffers (uses printk)\n\
244 dtc dump the tracing buffers for current CPU (uses printk)\n\
245 "
246 #ifdef CONFIG_PPC_POWERNV
247 " dx# dump xive on CPU #\n\
248 dxi# dump xive irq state #\n\
249 dxa dump xive on all CPUs\n"
250 #endif
251 " e print exception information\n\
252 f flush cache\n\
253 la lookup symbol+offset of specified address\n\
254 ls lookup address of specified symbol\n\
255 lp s [#] lookup address of percpu symbol s for current cpu, or cpu #\n\
256 m examine/change memory\n\
257 mm move a block of memory\n\
258 ms set a block of memory\n\
259 md compare two blocks of memory\n\
260 ml locate a block of memory\n\
261 mz zero a block of memory\n\
262 mi show information about memory allocation\n\
263 p call a procedure\n\
264 P list processes/tasks\n\
265 r print registers\n\
266 s single step\n"
267 #ifdef CONFIG_SPU_BASE
268 " ss stop execution on all spus\n\
269 sr restore execution on stopped spus\n\
270 sf # dump spu fields for spu # (in hex)\n\
271 sd # dump spu local store for spu # (in hex)\n\
272 sdi # disassemble spu local store for spu # (in hex)\n"
273 #endif
274 " S print special registers\n\
275 Sa print all SPRs\n\
276 Sr # read SPR #\n\
277 Sw #v write v to SPR #\n\
278 t print backtrace\n\
279 x exit monitor and recover\n\
280 X exit monitor and don't recover\n"
281 #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E)
282 " u dump segment table or SLB\n"
283 #elif defined(CONFIG_PPC_BOOK3S_32)
284 " u dump segment registers\n"
285 #elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E)
286 " u dump TLB\n"
287 #endif
288 " U show uptime information\n"
289 " ? help\n"
290 " # n limit output to n lines per page (for dp, dpa, dl)\n"
291 " zr reboot\n"
292 " zh halt\n"
293 ;
294
295 #ifdef CONFIG_SECURITY
xmon_is_locked_down(void)296 static bool xmon_is_locked_down(void)
297 {
298 static bool lockdown;
299
300 if (!lockdown) {
301 lockdown = !!security_locked_down(LOCKDOWN_XMON_RW);
302 if (lockdown) {
303 printf("xmon: Disabled due to kernel lockdown\n");
304 xmon_is_ro = true;
305 }
306 }
307
308 if (!xmon_is_ro) {
309 xmon_is_ro = !!security_locked_down(LOCKDOWN_XMON_WR);
310 if (xmon_is_ro)
311 printf("xmon: Read-only due to kernel lockdown\n");
312 }
313
314 return lockdown;
315 }
316 #else /* CONFIG_SECURITY */
xmon_is_locked_down(void)317 static inline bool xmon_is_locked_down(void)
318 {
319 return false;
320 }
321 #endif
322
323 static struct pt_regs *xmon_regs;
324
sync(void)325 static inline void sync(void)
326 {
327 asm volatile("sync; isync");
328 }
329
cflush(void * p)330 static inline void cflush(void *p)
331 {
332 asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p));
333 }
334
cinval(void * p)335 static inline void cinval(void *p)
336 {
337 asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p));
338 }
339
340 /**
341 * write_ciabr() - write the CIABR SPR
342 * @ciabr: The value to write.
343 *
344 * This function writes a value to the CIARB register either directly
345 * through mtspr instruction if the kernel is in HV privilege mode or
346 * call a hypervisor function to achieve the same in case the kernel
347 * is in supervisor privilege mode.
348 */
write_ciabr(unsigned long ciabr)349 static void write_ciabr(unsigned long ciabr)
350 {
351 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
352 return;
353
354 if (cpu_has_feature(CPU_FTR_HVMODE)) {
355 mtspr(SPRN_CIABR, ciabr);
356 return;
357 }
358 plpar_set_ciabr(ciabr);
359 }
360
361 /**
362 * set_ciabr() - set the CIABR
363 * @addr: The value to set.
364 *
365 * This function sets the correct privilege value into the the HW
366 * breakpoint address before writing it up in the CIABR register.
367 */
set_ciabr(unsigned long addr)368 static void set_ciabr(unsigned long addr)
369 {
370 addr &= ~CIABR_PRIV;
371
372 if (cpu_has_feature(CPU_FTR_HVMODE))
373 addr |= CIABR_PRIV_HYPER;
374 else
375 addr |= CIABR_PRIV_SUPER;
376 write_ciabr(addr);
377 }
378
379 /*
380 * Disable surveillance (the service processor watchdog function)
381 * while we are in xmon.
382 * XXX we should re-enable it when we leave. :)
383 */
384 #define SURVEILLANCE_TOKEN 9000
385
disable_surveillance(void)386 static inline void disable_surveillance(void)
387 {
388 #ifdef CONFIG_PPC_PSERIES
389 /* Since this can't be a module, args should end up below 4GB. */
390 static struct rtas_args args;
391
392 /*
393 * At this point we have got all the cpus we can into
394 * xmon, so there is hopefully no other cpu calling RTAS
395 * at the moment, even though we don't take rtas.lock.
396 * If we did try to take rtas.lock there would be a
397 * real possibility of deadlock.
398 */
399 if (set_indicator_token == RTAS_UNKNOWN_SERVICE)
400 return;
401
402 rtas_call_unlocked(&args, set_indicator_token, 3, 1, NULL,
403 SURVEILLANCE_TOKEN, 0, 0);
404
405 #endif /* CONFIG_PPC_PSERIES */
406 }
407
408 #ifdef CONFIG_SMP
409 static int xmon_speaker;
410
get_output_lock(void)411 static void get_output_lock(void)
412 {
413 int me = smp_processor_id() + 0x100;
414 int last_speaker = 0, prev;
415 long timeout;
416
417 if (xmon_speaker == me)
418 return;
419
420 for (;;) {
421 last_speaker = cmpxchg(&xmon_speaker, 0, me);
422 if (last_speaker == 0)
423 return;
424
425 /*
426 * Wait a full second for the lock, we might be on a slow
427 * console, but check every 100us.
428 */
429 timeout = 10000;
430 while (xmon_speaker == last_speaker) {
431 if (--timeout > 0) {
432 udelay(100);
433 continue;
434 }
435
436 /* hostile takeover */
437 prev = cmpxchg(&xmon_speaker, last_speaker, me);
438 if (prev == last_speaker)
439 return;
440 break;
441 }
442 }
443 }
444
release_output_lock(void)445 static void release_output_lock(void)
446 {
447 xmon_speaker = 0;
448 }
449
cpus_are_in_xmon(void)450 int cpus_are_in_xmon(void)
451 {
452 return !cpumask_empty(&cpus_in_xmon);
453 }
454
wait_for_other_cpus(int ncpus)455 static bool wait_for_other_cpus(int ncpus)
456 {
457 unsigned long timeout;
458
459 /* We wait for 2s, which is a metric "little while" */
460 for (timeout = 20000; timeout != 0; --timeout) {
461 if (cpumask_weight(&cpus_in_xmon) >= ncpus)
462 return true;
463 udelay(100);
464 barrier();
465 }
466
467 return false;
468 }
469 #else /* CONFIG_SMP */
get_output_lock(void)470 static inline void get_output_lock(void) {}
release_output_lock(void)471 static inline void release_output_lock(void) {}
472 #endif
473
unrecoverable_excp(struct pt_regs * regs)474 static inline int unrecoverable_excp(struct pt_regs *regs)
475 {
476 #if defined(CONFIG_4xx) || defined(CONFIG_PPC_BOOK3E)
477 /* We have no MSR_RI bit on 4xx or Book3e, so we simply return false */
478 return 0;
479 #else
480 return ((regs->msr & MSR_RI) == 0);
481 #endif
482 }
483
xmon_touch_watchdogs(void)484 static void xmon_touch_watchdogs(void)
485 {
486 touch_softlockup_watchdog_sync();
487 rcu_cpu_stall_reset();
488 touch_nmi_watchdog();
489 }
490
xmon_core(struct pt_regs * regs,int fromipi)491 static int xmon_core(struct pt_regs *regs, int fromipi)
492 {
493 int cmd = 0;
494 struct bpt *bp;
495 long recurse_jmp[JMP_BUF_LEN];
496 bool locked_down;
497 unsigned long offset;
498 unsigned long flags;
499 #ifdef CONFIG_SMP
500 int cpu;
501 int secondary;
502 #endif
503
504 local_irq_save(flags);
505 hard_irq_disable();
506
507 locked_down = xmon_is_locked_down();
508
509 if (!fromipi) {
510 tracing_enabled = tracing_is_on();
511 tracing_off();
512 }
513
514 bp = in_breakpoint_table(regs->nip, &offset);
515 if (bp != NULL) {
516 regs->nip = bp->address + offset;
517 atomic_dec(&bp->ref_count);
518 }
519
520 remove_cpu_bpts();
521
522 #ifdef CONFIG_SMP
523 cpu = smp_processor_id();
524 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
525 /*
526 * We catch SPR read/write faults here because the 0x700, 0xf60
527 * etc. handlers don't call debugger_fault_handler().
528 */
529 if (catch_spr_faults)
530 longjmp(bus_error_jmp, 1);
531 get_output_lock();
532 excprint(regs);
533 printf("cpu 0x%x: Exception %lx %s in xmon, "
534 "returning to main loop\n",
535 cpu, regs->trap, getvecname(TRAP(regs)));
536 release_output_lock();
537 longjmp(xmon_fault_jmp[cpu], 1);
538 }
539
540 if (setjmp(recurse_jmp) != 0) {
541 if (!in_xmon || !xmon_gate) {
542 get_output_lock();
543 printf("xmon: WARNING: bad recursive fault "
544 "on cpu 0x%x\n", cpu);
545 release_output_lock();
546 goto waiting;
547 }
548 secondary = !(xmon_taken && cpu == xmon_owner);
549 goto cmdloop;
550 }
551
552 xmon_fault_jmp[cpu] = recurse_jmp;
553
554 bp = NULL;
555 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT))
556 bp = at_breakpoint(regs->nip);
557 if (bp || unrecoverable_excp(regs))
558 fromipi = 0;
559
560 if (!fromipi) {
561 get_output_lock();
562 if (!locked_down)
563 excprint(regs);
564 if (bp) {
565 printf("cpu 0x%x stopped at breakpoint 0x%tx (",
566 cpu, BP_NUM(bp));
567 xmon_print_symbol(regs->nip, " ", ")\n");
568 }
569 if (unrecoverable_excp(regs))
570 printf("WARNING: exception is not recoverable, "
571 "can't continue\n");
572 release_output_lock();
573 }
574
575 cpumask_set_cpu(cpu, &cpus_in_xmon);
576
577 waiting:
578 secondary = 1;
579 spin_begin();
580 while (secondary && !xmon_gate) {
581 if (in_xmon == 0) {
582 if (fromipi) {
583 spin_end();
584 goto leave;
585 }
586 secondary = test_and_set_bit(0, &in_xmon);
587 }
588 spin_cpu_relax();
589 touch_nmi_watchdog();
590 }
591 spin_end();
592
593 if (!secondary && !xmon_gate) {
594 /* we are the first cpu to come in */
595 /* interrupt other cpu(s) */
596 int ncpus = num_online_cpus();
597
598 xmon_owner = cpu;
599 mb();
600 if (ncpus > 1) {
601 /*
602 * A system reset (trap == 0x100) can be triggered on
603 * all CPUs, so when we come in via 0x100 try waiting
604 * for the other CPUs to come in before we send the
605 * debugger break (IPI). This is similar to
606 * crash_kexec_secondary().
607 */
608 if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus))
609 smp_send_debugger_break();
610
611 wait_for_other_cpus(ncpus);
612 }
613 remove_bpts();
614 disable_surveillance();
615
616 if (!locked_down) {
617 /* for breakpoint or single step, print curr insn */
618 if (bp || TRAP(regs) == 0xd00)
619 ppc_inst_dump(regs->nip, 1, 0);
620 printf("enter ? for help\n");
621 }
622
623 mb();
624 xmon_gate = 1;
625 barrier();
626 touch_nmi_watchdog();
627 }
628
629 cmdloop:
630 while (in_xmon) {
631 if (secondary) {
632 spin_begin();
633 if (cpu == xmon_owner) {
634 if (!test_and_set_bit(0, &xmon_taken)) {
635 secondary = 0;
636 spin_end();
637 continue;
638 }
639 /* missed it */
640 while (cpu == xmon_owner)
641 spin_cpu_relax();
642 }
643 spin_cpu_relax();
644 touch_nmi_watchdog();
645 } else {
646 if (!locked_down)
647 cmd = cmds(regs);
648 if (locked_down || cmd != 0) {
649 /* exiting xmon */
650 insert_bpts();
651 xmon_gate = 0;
652 wmb();
653 in_xmon = 0;
654 break;
655 }
656 /* have switched to some other cpu */
657 secondary = 1;
658 }
659 }
660 leave:
661 cpumask_clear_cpu(cpu, &cpus_in_xmon);
662 xmon_fault_jmp[cpu] = NULL;
663 #else
664 /* UP is simple... */
665 if (in_xmon) {
666 printf("Exception %lx %s in xmon, returning to main loop\n",
667 regs->trap, getvecname(TRAP(regs)));
668 longjmp(xmon_fault_jmp[0], 1);
669 }
670 if (setjmp(recurse_jmp) == 0) {
671 xmon_fault_jmp[0] = recurse_jmp;
672 in_xmon = 1;
673
674 excprint(regs);
675 bp = at_breakpoint(regs->nip);
676 if (bp) {
677 printf("Stopped at breakpoint %tx (", BP_NUM(bp));
678 xmon_print_symbol(regs->nip, " ", ")\n");
679 }
680 if (unrecoverable_excp(regs))
681 printf("WARNING: exception is not recoverable, "
682 "can't continue\n");
683 remove_bpts();
684 disable_surveillance();
685 if (!locked_down) {
686 /* for breakpoint or single step, print current insn */
687 if (bp || TRAP(regs) == 0xd00)
688 ppc_inst_dump(regs->nip, 1, 0);
689 printf("enter ? for help\n");
690 }
691 }
692
693 if (!locked_down)
694 cmd = cmds(regs);
695
696 insert_bpts();
697 in_xmon = 0;
698 #endif
699
700 #ifdef CONFIG_BOOKE
701 if (regs->msr & MSR_DE) {
702 bp = at_breakpoint(regs->nip);
703 if (bp != NULL) {
704 regs->nip = (unsigned long) &bp->instr[0];
705 atomic_inc(&bp->ref_count);
706 }
707 }
708 #else
709 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) {
710 bp = at_breakpoint(regs->nip);
711 if (bp != NULL) {
712 int stepped = emulate_step(regs, ppc_inst_read(bp->instr));
713 if (stepped == 0) {
714 regs->nip = (unsigned long) &bp->instr[0];
715 atomic_inc(&bp->ref_count);
716 } else if (stepped < 0) {
717 printf("Couldn't single-step %s instruction\n",
718 IS_RFID(ppc_inst_read(bp->instr))? "rfid": "mtmsrd");
719 }
720 }
721 }
722 #endif
723 if (locked_down)
724 clear_all_bpt();
725 else
726 insert_cpu_bpts();
727
728 xmon_touch_watchdogs();
729 local_irq_restore(flags);
730
731 return cmd != 'X' && cmd != EOF;
732 }
733
xmon(struct pt_regs * excp)734 int xmon(struct pt_regs *excp)
735 {
736 struct pt_regs regs;
737
738 if (excp == NULL) {
739 ppc_save_regs(®s);
740 excp = ®s;
741 }
742
743 return xmon_core(excp, 0);
744 }
745 EXPORT_SYMBOL(xmon);
746
xmon_irq(int irq,void * d)747 irqreturn_t xmon_irq(int irq, void *d)
748 {
749 unsigned long flags;
750 local_irq_save(flags);
751 printf("Keyboard interrupt\n");
752 xmon(get_irq_regs());
753 local_irq_restore(flags);
754 return IRQ_HANDLED;
755 }
756
xmon_bpt(struct pt_regs * regs)757 static int xmon_bpt(struct pt_regs *regs)
758 {
759 struct bpt *bp;
760 unsigned long offset;
761
762 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
763 return 0;
764
765 /* Are we at the trap at bp->instr[1] for some bp? */
766 bp = in_breakpoint_table(regs->nip, &offset);
767 if (bp != NULL && (offset == 4 || offset == 8)) {
768 regs->nip = bp->address + offset;
769 atomic_dec(&bp->ref_count);
770 return 1;
771 }
772
773 /* Are we at a breakpoint? */
774 bp = at_breakpoint(regs->nip);
775 if (!bp)
776 return 0;
777
778 xmon_core(regs, 0);
779
780 return 1;
781 }
782
xmon_sstep(struct pt_regs * regs)783 static int xmon_sstep(struct pt_regs *regs)
784 {
785 if (user_mode(regs))
786 return 0;
787 xmon_core(regs, 0);
788 return 1;
789 }
790
xmon_break_match(struct pt_regs * regs)791 static int xmon_break_match(struct pt_regs *regs)
792 {
793 int i;
794
795 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
796 return 0;
797 for (i = 0; i < nr_wp_slots(); i++) {
798 if (dabr[i].enabled)
799 goto found;
800 }
801 return 0;
802
803 found:
804 xmon_core(regs, 0);
805 return 1;
806 }
807
xmon_iabr_match(struct pt_regs * regs)808 static int xmon_iabr_match(struct pt_regs *regs)
809 {
810 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
811 return 0;
812 if (iabr == NULL)
813 return 0;
814 xmon_core(regs, 0);
815 return 1;
816 }
817
xmon_ipi(struct pt_regs * regs)818 static int xmon_ipi(struct pt_regs *regs)
819 {
820 #ifdef CONFIG_SMP
821 if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon))
822 xmon_core(regs, 1);
823 #endif
824 return 0;
825 }
826
xmon_fault_handler(struct pt_regs * regs)827 static int xmon_fault_handler(struct pt_regs *regs)
828 {
829 struct bpt *bp;
830 unsigned long offset;
831
832 if (in_xmon && catch_memory_errors)
833 handle_fault(regs); /* doesn't return */
834
835 if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) {
836 bp = in_breakpoint_table(regs->nip, &offset);
837 if (bp != NULL) {
838 regs->nip = bp->address + offset;
839 atomic_dec(&bp->ref_count);
840 }
841 }
842
843 return 0;
844 }
845
846 /* Force enable xmon if not already enabled */
force_enable_xmon(void)847 static inline void force_enable_xmon(void)
848 {
849 /* Enable xmon hooks if needed */
850 if (!xmon_on) {
851 printf("xmon: Enabling debugger hooks\n");
852 xmon_on = 1;
853 }
854 }
855
at_breakpoint(unsigned long pc)856 static struct bpt *at_breakpoint(unsigned long pc)
857 {
858 int i;
859 struct bpt *bp;
860
861 bp = bpts;
862 for (i = 0; i < NBPTS; ++i, ++bp)
863 if (bp->enabled && pc == bp->address)
864 return bp;
865 return NULL;
866 }
867
in_breakpoint_table(unsigned long nip,unsigned long * offp)868 static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp)
869 {
870 unsigned long off;
871
872 off = nip - (unsigned long)bpt_table;
873 if (off >= sizeof(bpt_table))
874 return NULL;
875 *offp = off & (BPT_SIZE - 1);
876 if (off & 3)
877 return NULL;
878 return bpts + (off / BPT_SIZE);
879 }
880
new_breakpoint(unsigned long a)881 static struct bpt *new_breakpoint(unsigned long a)
882 {
883 struct bpt *bp;
884
885 a &= ~3UL;
886 bp = at_breakpoint(a);
887 if (bp)
888 return bp;
889
890 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
891 if (!bp->enabled && atomic_read(&bp->ref_count) == 0) {
892 bp->address = a;
893 bp->instr = (void *)(bpt_table + ((bp - bpts) * BPT_WORDS));
894 return bp;
895 }
896 }
897
898 printf("Sorry, no free breakpoints. Please clear one first.\n");
899 return NULL;
900 }
901
insert_bpts(void)902 static void insert_bpts(void)
903 {
904 int i;
905 struct ppc_inst instr, instr2;
906 struct bpt *bp, *bp2;
907
908 bp = bpts;
909 for (i = 0; i < NBPTS; ++i, ++bp) {
910 if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0)
911 continue;
912 if (!mread_instr(bp->address, &instr)) {
913 printf("Couldn't read instruction at %lx, "
914 "disabling breakpoint there\n", bp->address);
915 bp->enabled = 0;
916 continue;
917 }
918 if (IS_MTMSRD(instr) || IS_RFID(instr)) {
919 printf("Breakpoint at %lx is on an mtmsrd or rfid "
920 "instruction, disabling it\n", bp->address);
921 bp->enabled = 0;
922 continue;
923 }
924 /*
925 * Check the address is not a suffix by looking for a prefix in
926 * front of it.
927 */
928 if (mread_instr(bp->address - 4, &instr2) == 8) {
929 printf("Breakpoint at %lx is on the second word of a prefixed instruction, disabling it\n",
930 bp->address);
931 bp->enabled = 0;
932 continue;
933 }
934 /*
935 * We might still be a suffix - if the prefix has already been
936 * replaced by a breakpoint we won't catch it with the above
937 * test.
938 */
939 bp2 = at_breakpoint(bp->address - 4);
940 if (bp2 && ppc_inst_prefixed(ppc_inst_read(bp2->instr))) {
941 printf("Breakpoint at %lx is on the second word of a prefixed instruction, disabling it\n",
942 bp->address);
943 bp->enabled = 0;
944 continue;
945 }
946
947 patch_instruction(bp->instr, instr);
948 patch_instruction(ppc_inst_next(bp->instr, &instr),
949 ppc_inst(bpinstr));
950 if (bp->enabled & BP_CIABR)
951 continue;
952 if (patch_instruction((struct ppc_inst *)bp->address,
953 ppc_inst(bpinstr)) != 0) {
954 printf("Couldn't write instruction at %lx, "
955 "disabling breakpoint there\n", bp->address);
956 bp->enabled &= ~BP_TRAP;
957 continue;
958 }
959 }
960 }
961
insert_cpu_bpts(void)962 static void insert_cpu_bpts(void)
963 {
964 int i;
965 struct arch_hw_breakpoint brk;
966
967 for (i = 0; i < nr_wp_slots(); i++) {
968 if (dabr[i].enabled) {
969 brk.address = dabr[i].address;
970 brk.type = (dabr[i].enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
971 brk.len = 8;
972 brk.hw_len = 8;
973 __set_breakpoint(i, &brk);
974 }
975 }
976
977 if (iabr)
978 set_ciabr(iabr->address);
979 }
980
remove_bpts(void)981 static void remove_bpts(void)
982 {
983 int i;
984 struct bpt *bp;
985 struct ppc_inst instr;
986
987 bp = bpts;
988 for (i = 0; i < NBPTS; ++i, ++bp) {
989 if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP)
990 continue;
991 if (mread_instr(bp->address, &instr)
992 && ppc_inst_equal(instr, ppc_inst(bpinstr))
993 && patch_instruction(
994 (struct ppc_inst *)bp->address, ppc_inst_read(bp->instr)) != 0)
995 printf("Couldn't remove breakpoint at %lx\n",
996 bp->address);
997 }
998 }
999
remove_cpu_bpts(void)1000 static void remove_cpu_bpts(void)
1001 {
1002 hw_breakpoint_disable();
1003 write_ciabr(0);
1004 }
1005
1006 /* Based on uptime_proc_show(). */
1007 static void
show_uptime(void)1008 show_uptime(void)
1009 {
1010 struct timespec64 uptime;
1011
1012 if (setjmp(bus_error_jmp) == 0) {
1013 catch_memory_errors = 1;
1014 sync();
1015
1016 ktime_get_coarse_boottime_ts64(&uptime);
1017 printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec,
1018 ((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100)));
1019
1020 sync();
1021 __delay(200); \
1022 }
1023 catch_memory_errors = 0;
1024 }
1025
set_lpp_cmd(void)1026 static void set_lpp_cmd(void)
1027 {
1028 unsigned long lpp;
1029
1030 if (!scanhex(&lpp)) {
1031 printf("Invalid number.\n");
1032 lpp = 0;
1033 }
1034 xmon_set_pagination_lpp(lpp);
1035 }
1036 /* Command interpreting routine */
1037 static char *last_cmd;
1038
1039 static int
cmds(struct pt_regs * excp)1040 cmds(struct pt_regs *excp)
1041 {
1042 int cmd = 0;
1043
1044 last_cmd = NULL;
1045 xmon_regs = excp;
1046
1047 xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
1048
1049 for(;;) {
1050 #ifdef CONFIG_SMP
1051 printf("%x:", smp_processor_id());
1052 #endif /* CONFIG_SMP */
1053 printf("mon> ");
1054 flush_input();
1055 termch = 0;
1056 cmd = skipbl();
1057 if( cmd == '\n' ) {
1058 if (last_cmd == NULL)
1059 continue;
1060 take_input(last_cmd);
1061 last_cmd = NULL;
1062 cmd = inchar();
1063 }
1064 switch (cmd) {
1065 case 'm':
1066 cmd = inchar();
1067 switch (cmd) {
1068 case 'm':
1069 case 's':
1070 case 'd':
1071 memops(cmd);
1072 break;
1073 case 'l':
1074 memlocate();
1075 break;
1076 case 'z':
1077 if (xmon_is_ro) {
1078 printf(xmon_ro_msg);
1079 break;
1080 }
1081 memzcan();
1082 break;
1083 case 'i':
1084 show_mem(0, NULL);
1085 break;
1086 default:
1087 termch = cmd;
1088 memex();
1089 }
1090 break;
1091 case 'd':
1092 dump();
1093 break;
1094 case 'l':
1095 symbol_lookup();
1096 break;
1097 case 'r':
1098 prregs(excp); /* print regs */
1099 break;
1100 case 'e':
1101 excprint(excp);
1102 break;
1103 case 'S':
1104 super_regs();
1105 break;
1106 case 't':
1107 backtrace(excp);
1108 break;
1109 case 'f':
1110 cacheflush();
1111 break;
1112 case 's':
1113 if (do_spu_cmd() == 0)
1114 break;
1115 if (do_step(excp))
1116 return cmd;
1117 break;
1118 case 'x':
1119 case 'X':
1120 if (tracing_enabled)
1121 tracing_on();
1122 return cmd;
1123 case EOF:
1124 printf(" <no input ...>\n");
1125 mdelay(2000);
1126 return cmd;
1127 case '?':
1128 xmon_puts(help_string);
1129 break;
1130 case '#':
1131 set_lpp_cmd();
1132 break;
1133 case 'b':
1134 bpt_cmds();
1135 break;
1136 case 'C':
1137 csum();
1138 break;
1139 case 'c':
1140 if (cpu_cmd())
1141 return 0;
1142 break;
1143 case 'z':
1144 bootcmds();
1145 break;
1146 case 'p':
1147 if (xmon_is_ro) {
1148 printf(xmon_ro_msg);
1149 break;
1150 }
1151 proccall();
1152 break;
1153 case 'P':
1154 show_tasks();
1155 break;
1156 #ifdef CONFIG_PPC_BOOK3S
1157 case 'u':
1158 dump_segments();
1159 break;
1160 #elif defined(CONFIG_44x)
1161 case 'u':
1162 dump_tlb_44x();
1163 break;
1164 #elif defined(CONFIG_PPC_BOOK3E)
1165 case 'u':
1166 dump_tlb_book3e();
1167 break;
1168 #endif
1169 case 'U':
1170 show_uptime();
1171 break;
1172 default:
1173 printf("Unrecognized command: ");
1174 do {
1175 if (' ' < cmd && cmd <= '~')
1176 putchar(cmd);
1177 else
1178 printf("\\x%x", cmd);
1179 cmd = inchar();
1180 } while (cmd != '\n');
1181 printf(" (type ? for help)\n");
1182 break;
1183 }
1184 }
1185 }
1186
1187 #ifdef CONFIG_BOOKE
do_step(struct pt_regs * regs)1188 static int do_step(struct pt_regs *regs)
1189 {
1190 regs->msr |= MSR_DE;
1191 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
1192 return 1;
1193 }
1194 #else
1195 /*
1196 * Step a single instruction.
1197 * Some instructions we emulate, others we execute with MSR_SE set.
1198 */
do_step(struct pt_regs * regs)1199 static int do_step(struct pt_regs *regs)
1200 {
1201 struct ppc_inst instr;
1202 int stepped;
1203
1204 force_enable_xmon();
1205 /* check we are in 64-bit kernel mode, translation enabled */
1206 if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) {
1207 if (mread_instr(regs->nip, &instr)) {
1208 stepped = emulate_step(regs, instr);
1209 if (stepped < 0) {
1210 printf("Couldn't single-step %s instruction\n",
1211 (IS_RFID(instr)? "rfid": "mtmsrd"));
1212 return 0;
1213 }
1214 if (stepped > 0) {
1215 set_trap(regs, 0xd00);
1216 printf("stepped to ");
1217 xmon_print_symbol(regs->nip, " ", "\n");
1218 ppc_inst_dump(regs->nip, 1, 0);
1219 return 0;
1220 }
1221 }
1222 }
1223 regs->msr |= MSR_SE;
1224 return 1;
1225 }
1226 #endif
1227
bootcmds(void)1228 static void bootcmds(void)
1229 {
1230 char tmp[64];
1231 int cmd;
1232
1233 cmd = inchar();
1234 if (cmd == 'r') {
1235 getstring(tmp, 64);
1236 ppc_md.restart(tmp);
1237 } else if (cmd == 'h') {
1238 ppc_md.halt();
1239 } else if (cmd == 'p') {
1240 if (pm_power_off)
1241 pm_power_off();
1242 }
1243 }
1244
cpu_cmd(void)1245 static int cpu_cmd(void)
1246 {
1247 #ifdef CONFIG_SMP
1248 unsigned long cpu, first_cpu, last_cpu;
1249 int timeout;
1250
1251 if (!scanhex(&cpu)) {
1252 /* print cpus waiting or in xmon */
1253 printf("cpus stopped:");
1254 last_cpu = first_cpu = NR_CPUS;
1255 for_each_possible_cpu(cpu) {
1256 if (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
1257 if (cpu == last_cpu + 1) {
1258 last_cpu = cpu;
1259 } else {
1260 if (last_cpu != first_cpu)
1261 printf("-0x%lx", last_cpu);
1262 last_cpu = first_cpu = cpu;
1263 printf(" 0x%lx", cpu);
1264 }
1265 }
1266 }
1267 if (last_cpu != first_cpu)
1268 printf("-0x%lx", last_cpu);
1269 printf("\n");
1270 return 0;
1271 }
1272 /* try to switch to cpu specified */
1273 if (!cpumask_test_cpu(cpu, &cpus_in_xmon)) {
1274 printf("cpu 0x%lx isn't in xmon\n", cpu);
1275 #ifdef CONFIG_PPC64
1276 printf("backtrace of paca[0x%lx].saved_r1 (possibly stale):\n", cpu);
1277 xmon_show_stack(paca_ptrs[cpu]->saved_r1, 0, 0);
1278 #endif
1279 return 0;
1280 }
1281 xmon_taken = 0;
1282 mb();
1283 xmon_owner = cpu;
1284 timeout = 10000000;
1285 while (!xmon_taken) {
1286 if (--timeout == 0) {
1287 if (test_and_set_bit(0, &xmon_taken))
1288 break;
1289 /* take control back */
1290 mb();
1291 xmon_owner = smp_processor_id();
1292 printf("cpu 0x%lx didn't take control\n", cpu);
1293 return 0;
1294 }
1295 barrier();
1296 }
1297 return 1;
1298 #else
1299 return 0;
1300 #endif /* CONFIG_SMP */
1301 }
1302
1303 static unsigned short fcstab[256] = {
1304 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
1305 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
1306 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
1307 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
1308 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
1309 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
1310 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
1311 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
1312 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
1313 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
1314 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
1315 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
1316 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
1317 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
1318 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
1319 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
1320 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
1321 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
1322 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
1323 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
1324 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
1325 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
1326 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
1327 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
1328 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
1329 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
1330 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
1331 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
1332 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
1333 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
1334 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
1335 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
1336 };
1337
1338 #define FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
1339
1340 static void
csum(void)1341 csum(void)
1342 {
1343 unsigned int i;
1344 unsigned short fcs;
1345 unsigned char v;
1346
1347 if (!scanhex(&adrs))
1348 return;
1349 if (!scanhex(&ncsum))
1350 return;
1351 fcs = 0xffff;
1352 for (i = 0; i < ncsum; ++i) {
1353 if (mread(adrs+i, &v, 1) == 0) {
1354 printf("csum stopped at "REG"\n", adrs+i);
1355 break;
1356 }
1357 fcs = FCS(fcs, v);
1358 }
1359 printf("%x\n", fcs);
1360 }
1361
1362 /*
1363 * Check if this is a suitable place to put a breakpoint.
1364 */
check_bp_loc(unsigned long addr)1365 static long check_bp_loc(unsigned long addr)
1366 {
1367 struct ppc_inst instr;
1368
1369 addr &= ~3;
1370 if (!is_kernel_addr(addr)) {
1371 printf("Breakpoints may only be placed at kernel addresses\n");
1372 return 0;
1373 }
1374 if (!mread_instr(addr, &instr)) {
1375 printf("Can't read instruction at address %lx\n", addr);
1376 return 0;
1377 }
1378 if (IS_MTMSRD(instr) || IS_RFID(instr)) {
1379 printf("Breakpoints may not be placed on mtmsrd or rfid "
1380 "instructions\n");
1381 return 0;
1382 }
1383 return 1;
1384 }
1385
find_free_data_bpt(void)1386 static int find_free_data_bpt(void)
1387 {
1388 int i;
1389
1390 for (i = 0; i < nr_wp_slots(); i++) {
1391 if (!dabr[i].enabled)
1392 return i;
1393 }
1394 printf("Couldn't find free breakpoint register\n");
1395 return -1;
1396 }
1397
print_data_bpts(void)1398 static void print_data_bpts(void)
1399 {
1400 int i;
1401
1402 for (i = 0; i < nr_wp_slots(); i++) {
1403 if (!dabr[i].enabled)
1404 continue;
1405
1406 printf(" data "REG" [", dabr[i].address);
1407 if (dabr[i].enabled & 1)
1408 printf("r");
1409 if (dabr[i].enabled & 2)
1410 printf("w");
1411 printf("]\n");
1412 }
1413 }
1414
1415 static char *breakpoint_help_string =
1416 "Breakpoint command usage:\n"
1417 "b show breakpoints\n"
1418 "b <addr> [cnt] set breakpoint at given instr addr\n"
1419 "bc clear all breakpoints\n"
1420 "bc <n/addr> clear breakpoint number n or at addr\n"
1421 "bi <addr> [cnt] set hardware instr breakpoint (POWER8 only)\n"
1422 "bd <addr> [cnt] set hardware data breakpoint\n"
1423 "";
1424
1425 static void
bpt_cmds(void)1426 bpt_cmds(void)
1427 {
1428 int cmd;
1429 unsigned long a;
1430 int i;
1431 struct bpt *bp;
1432
1433 cmd = inchar();
1434
1435 switch (cmd) {
1436 #ifndef CONFIG_PPC_8xx
1437 static const char badaddr[] = "Only kernel addresses are permitted for breakpoints\n";
1438 int mode;
1439 case 'd': /* bd - hardware data breakpoint */
1440 if (xmon_is_ro) {
1441 printf(xmon_ro_msg);
1442 break;
1443 }
1444 if (!ppc_breakpoint_available()) {
1445 printf("Hardware data breakpoint not supported on this cpu\n");
1446 break;
1447 }
1448 i = find_free_data_bpt();
1449 if (i < 0)
1450 break;
1451 mode = 7;
1452 cmd = inchar();
1453 if (cmd == 'r')
1454 mode = 5;
1455 else if (cmd == 'w')
1456 mode = 6;
1457 else
1458 termch = cmd;
1459 dabr[i].address = 0;
1460 dabr[i].enabled = 0;
1461 if (scanhex(&dabr[i].address)) {
1462 if (!is_kernel_addr(dabr[i].address)) {
1463 printf(badaddr);
1464 break;
1465 }
1466 dabr[i].address &= ~HW_BRK_TYPE_DABR;
1467 dabr[i].enabled = mode | BP_DABR;
1468 }
1469
1470 force_enable_xmon();
1471 break;
1472
1473 case 'i': /* bi - hardware instr breakpoint */
1474 if (xmon_is_ro) {
1475 printf(xmon_ro_msg);
1476 break;
1477 }
1478 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
1479 printf("Hardware instruction breakpoint "
1480 "not supported on this cpu\n");
1481 break;
1482 }
1483 if (iabr) {
1484 iabr->enabled &= ~BP_CIABR;
1485 iabr = NULL;
1486 }
1487 if (!scanhex(&a))
1488 break;
1489 if (!check_bp_loc(a))
1490 break;
1491 bp = new_breakpoint(a);
1492 if (bp != NULL) {
1493 bp->enabled |= BP_CIABR;
1494 iabr = bp;
1495 force_enable_xmon();
1496 }
1497 break;
1498 #endif
1499
1500 case 'c':
1501 if (!scanhex(&a)) {
1502 /* clear all breakpoints */
1503 for (i = 0; i < NBPTS; ++i)
1504 bpts[i].enabled = 0;
1505 iabr = NULL;
1506 for (i = 0; i < nr_wp_slots(); i++)
1507 dabr[i].enabled = 0;
1508
1509 printf("All breakpoints cleared\n");
1510 break;
1511 }
1512
1513 if (a <= NBPTS && a >= 1) {
1514 /* assume a breakpoint number */
1515 bp = &bpts[a-1]; /* bp nums are 1 based */
1516 } else {
1517 /* assume a breakpoint address */
1518 bp = at_breakpoint(a);
1519 if (bp == NULL) {
1520 printf("No breakpoint at %lx\n", a);
1521 break;
1522 }
1523 }
1524
1525 printf("Cleared breakpoint %tx (", BP_NUM(bp));
1526 xmon_print_symbol(bp->address, " ", ")\n");
1527 bp->enabled = 0;
1528 break;
1529
1530 default:
1531 termch = cmd;
1532 cmd = skipbl();
1533 if (cmd == '?') {
1534 printf(breakpoint_help_string);
1535 break;
1536 }
1537 termch = cmd;
1538
1539 if (xmon_is_ro || !scanhex(&a)) {
1540 /* print all breakpoints */
1541 printf(" type address\n");
1542 print_data_bpts();
1543 for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
1544 if (!bp->enabled)
1545 continue;
1546 printf("%tx %s ", BP_NUM(bp),
1547 (bp->enabled & BP_CIABR) ? "inst": "trap");
1548 xmon_print_symbol(bp->address, " ", "\n");
1549 }
1550 break;
1551 }
1552
1553 if (!check_bp_loc(a))
1554 break;
1555 bp = new_breakpoint(a);
1556 if (bp != NULL) {
1557 bp->enabled |= BP_TRAP;
1558 force_enable_xmon();
1559 }
1560 break;
1561 }
1562 }
1563
1564 /* Very cheap human name for vector lookup. */
1565 static
getvecname(unsigned long vec)1566 const char *getvecname(unsigned long vec)
1567 {
1568 char *ret;
1569
1570 switch (vec) {
1571 case 0x100: ret = "(System Reset)"; break;
1572 case 0x200: ret = "(Machine Check)"; break;
1573 case 0x300: ret = "(Data Access)"; break;
1574 case 0x380:
1575 if (radix_enabled())
1576 ret = "(Data Access Out of Range)";
1577 else
1578 ret = "(Data SLB Access)";
1579 break;
1580 case 0x400: ret = "(Instruction Access)"; break;
1581 case 0x480:
1582 if (radix_enabled())
1583 ret = "(Instruction Access Out of Range)";
1584 else
1585 ret = "(Instruction SLB Access)";
1586 break;
1587 case 0x500: ret = "(Hardware Interrupt)"; break;
1588 case 0x600: ret = "(Alignment)"; break;
1589 case 0x700: ret = "(Program Check)"; break;
1590 case 0x800: ret = "(FPU Unavailable)"; break;
1591 case 0x900: ret = "(Decrementer)"; break;
1592 case 0x980: ret = "(Hypervisor Decrementer)"; break;
1593 case 0xa00: ret = "(Doorbell)"; break;
1594 case 0xc00: ret = "(System Call)"; break;
1595 case 0xd00: ret = "(Single Step)"; break;
1596 case 0xe40: ret = "(Emulation Assist)"; break;
1597 case 0xe60: ret = "(HMI)"; break;
1598 case 0xe80: ret = "(Hypervisor Doorbell)"; break;
1599 case 0xf00: ret = "(Performance Monitor)"; break;
1600 case 0xf20: ret = "(Altivec Unavailable)"; break;
1601 case 0x1300: ret = "(Instruction Breakpoint)"; break;
1602 case 0x1500: ret = "(Denormalisation)"; break;
1603 case 0x1700: ret = "(Altivec Assist)"; break;
1604 case 0x3000: ret = "(System Call Vectored)"; break;
1605 default: ret = "";
1606 }
1607 return ret;
1608 }
1609
get_function_bounds(unsigned long pc,unsigned long * startp,unsigned long * endp)1610 static void get_function_bounds(unsigned long pc, unsigned long *startp,
1611 unsigned long *endp)
1612 {
1613 unsigned long size, offset;
1614 const char *name;
1615
1616 *startp = *endp = 0;
1617 if (pc == 0)
1618 return;
1619 if (setjmp(bus_error_jmp) == 0) {
1620 catch_memory_errors = 1;
1621 sync();
1622 name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr);
1623 if (name != NULL) {
1624 *startp = pc - offset;
1625 *endp = pc - offset + size;
1626 }
1627 sync();
1628 }
1629 catch_memory_errors = 0;
1630 }
1631
1632 #define LRSAVE_OFFSET (STACK_FRAME_LR_SAVE * sizeof(unsigned long))
1633 #define MARKER_OFFSET (STACK_FRAME_MARKER * sizeof(unsigned long))
1634
xmon_show_stack(unsigned long sp,unsigned long lr,unsigned long pc)1635 static void xmon_show_stack(unsigned long sp, unsigned long lr,
1636 unsigned long pc)
1637 {
1638 int max_to_print = 64;
1639 unsigned long ip;
1640 unsigned long newsp;
1641 unsigned long marker;
1642 struct pt_regs regs;
1643
1644 while (max_to_print--) {
1645 if (!is_kernel_addr(sp)) {
1646 if (sp != 0)
1647 printf("SP (%lx) is in userspace\n", sp);
1648 break;
1649 }
1650
1651 if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long))
1652 || !mread(sp, &newsp, sizeof(unsigned long))) {
1653 printf("Couldn't read stack frame at %lx\n", sp);
1654 break;
1655 }
1656
1657 /*
1658 * For the first stack frame, try to work out if
1659 * LR and/or the saved LR value in the bottommost
1660 * stack frame are valid.
1661 */
1662 if ((pc | lr) != 0) {
1663 unsigned long fnstart, fnend;
1664 unsigned long nextip;
1665 int printip = 1;
1666
1667 get_function_bounds(pc, &fnstart, &fnend);
1668 nextip = 0;
1669 if (newsp > sp)
1670 mread(newsp + LRSAVE_OFFSET, &nextip,
1671 sizeof(unsigned long));
1672 if (lr == ip) {
1673 if (!is_kernel_addr(lr)
1674 || (fnstart <= lr && lr < fnend))
1675 printip = 0;
1676 } else if (lr == nextip) {
1677 printip = 0;
1678 } else if (is_kernel_addr(lr)
1679 && !(fnstart <= lr && lr < fnend)) {
1680 printf("[link register ] ");
1681 xmon_print_symbol(lr, " ", "\n");
1682 }
1683 if (printip) {
1684 printf("["REG"] ", sp);
1685 xmon_print_symbol(ip, " ", " (unreliable)\n");
1686 }
1687 pc = lr = 0;
1688
1689 } else {
1690 printf("["REG"] ", sp);
1691 xmon_print_symbol(ip, " ", "\n");
1692 }
1693
1694 /* Look for "regshere" marker to see if this is
1695 an exception frame. */
1696 if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long))
1697 && marker == STACK_FRAME_REGS_MARKER) {
1698 if (mread(sp + STACK_FRAME_OVERHEAD, ®s, sizeof(regs))
1699 != sizeof(regs)) {
1700 printf("Couldn't read registers at %lx\n",
1701 sp + STACK_FRAME_OVERHEAD);
1702 break;
1703 }
1704 printf("--- Exception: %lx %s at ", regs.trap,
1705 getvecname(TRAP(®s)));
1706 pc = regs.nip;
1707 lr = regs.link;
1708 xmon_print_symbol(pc, " ", "\n");
1709 }
1710
1711 if (newsp == 0)
1712 break;
1713
1714 sp = newsp;
1715 }
1716 }
1717
backtrace(struct pt_regs * excp)1718 static void backtrace(struct pt_regs *excp)
1719 {
1720 unsigned long sp;
1721
1722 if (scanhex(&sp))
1723 xmon_show_stack(sp, 0, 0);
1724 else
1725 xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
1726 scannl();
1727 }
1728
print_bug_trap(struct pt_regs * regs)1729 static void print_bug_trap(struct pt_regs *regs)
1730 {
1731 #ifdef CONFIG_BUG
1732 const struct bug_entry *bug;
1733 unsigned long addr;
1734
1735 if (regs->msr & MSR_PR)
1736 return; /* not in kernel */
1737 addr = regs->nip; /* address of trap instruction */
1738 if (!is_kernel_addr(addr))
1739 return;
1740 bug = find_bug(regs->nip);
1741 if (bug == NULL)
1742 return;
1743 if (is_warning_bug(bug))
1744 return;
1745
1746 #ifdef CONFIG_DEBUG_BUGVERBOSE
1747 printf("kernel BUG at %s:%u!\n",
1748 bug->file, bug->line);
1749 #else
1750 printf("kernel BUG at %px!\n", (void *)bug->bug_addr);
1751 #endif
1752 #endif /* CONFIG_BUG */
1753 }
1754
excprint(struct pt_regs * fp)1755 static void excprint(struct pt_regs *fp)
1756 {
1757 unsigned long trap;
1758
1759 #ifdef CONFIG_SMP
1760 printf("cpu 0x%x: ", smp_processor_id());
1761 #endif /* CONFIG_SMP */
1762
1763 trap = TRAP(fp);
1764 printf("Vector: %lx %s at [%px]\n", fp->trap, getvecname(trap), fp);
1765 printf(" pc: ");
1766 xmon_print_symbol(fp->nip, ": ", "\n");
1767
1768 printf(" lr: ");
1769 xmon_print_symbol(fp->link, ": ", "\n");
1770
1771 printf(" sp: %lx\n", fp->gpr[1]);
1772 printf(" msr: %lx\n", fp->msr);
1773
1774 if (trap == 0x300 || trap == 0x380 || trap == 0x600 || trap == 0x200) {
1775 printf(" dar: %lx\n", fp->dar);
1776 if (trap != 0x380)
1777 printf(" dsisr: %lx\n", fp->dsisr);
1778 }
1779
1780 printf(" current = 0x%px\n", current);
1781 #ifdef CONFIG_PPC64
1782 printf(" paca = 0x%px\t irqmask: 0x%02x\t irq_happened: 0x%02x\n",
1783 local_paca, local_paca->irq_soft_mask, local_paca->irq_happened);
1784 #endif
1785 if (current) {
1786 printf(" pid = %d, comm = %s\n",
1787 current->pid, current->comm);
1788 }
1789
1790 if (trap == 0x700)
1791 print_bug_trap(fp);
1792
1793 printf(linux_banner);
1794 }
1795
prregs(struct pt_regs * fp)1796 static void prregs(struct pt_regs *fp)
1797 {
1798 int n, trap;
1799 unsigned long base;
1800 struct pt_regs regs;
1801
1802 if (scanhex(&base)) {
1803 if (setjmp(bus_error_jmp) == 0) {
1804 catch_memory_errors = 1;
1805 sync();
1806 regs = *(struct pt_regs *)base;
1807 sync();
1808 __delay(200);
1809 } else {
1810 catch_memory_errors = 0;
1811 printf("*** Error reading registers from "REG"\n",
1812 base);
1813 return;
1814 }
1815 catch_memory_errors = 0;
1816 fp = ®s;
1817 }
1818
1819 #ifdef CONFIG_PPC64
1820 if (FULL_REGS(fp)) {
1821 for (n = 0; n < 16; ++n)
1822 printf("R%.2d = "REG" R%.2d = "REG"\n",
1823 n, fp->gpr[n], n+16, fp->gpr[n+16]);
1824 } else {
1825 for (n = 0; n < 7; ++n)
1826 printf("R%.2d = "REG" R%.2d = "REG"\n",
1827 n, fp->gpr[n], n+7, fp->gpr[n+7]);
1828 }
1829 #else
1830 for (n = 0; n < 32; ++n) {
1831 printf("R%.2d = %.8lx%s", n, fp->gpr[n],
1832 (n & 3) == 3? "\n": " ");
1833 if (n == 12 && !FULL_REGS(fp)) {
1834 printf("\n");
1835 break;
1836 }
1837 }
1838 #endif
1839 printf("pc = ");
1840 xmon_print_symbol(fp->nip, " ", "\n");
1841 if (!trap_is_syscall(fp) && cpu_has_feature(CPU_FTR_CFAR)) {
1842 printf("cfar= ");
1843 xmon_print_symbol(fp->orig_gpr3, " ", "\n");
1844 }
1845 printf("lr = ");
1846 xmon_print_symbol(fp->link, " ", "\n");
1847 printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr);
1848 printf("ctr = "REG" xer = "REG" trap = %4lx\n",
1849 fp->ctr, fp->xer, fp->trap);
1850 trap = TRAP(fp);
1851 if (trap == 0x300 || trap == 0x380 || trap == 0x600)
1852 printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr);
1853 }
1854
cacheflush(void)1855 static void cacheflush(void)
1856 {
1857 int cmd;
1858 unsigned long nflush;
1859
1860 cmd = inchar();
1861 if (cmd != 'i')
1862 termch = cmd;
1863 scanhex((void *)&adrs);
1864 if (termch != '\n')
1865 termch = 0;
1866 nflush = 1;
1867 scanhex(&nflush);
1868 nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES;
1869 if (setjmp(bus_error_jmp) == 0) {
1870 catch_memory_errors = 1;
1871 sync();
1872
1873 if (cmd != 'i' || IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
1874 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
1875 cflush((void *) adrs);
1876 } else {
1877 for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
1878 cinval((void *) adrs);
1879 }
1880 sync();
1881 /* wait a little while to see if we get a machine check */
1882 __delay(200);
1883 }
1884 catch_memory_errors = 0;
1885 }
1886
1887 extern unsigned long xmon_mfspr(int spr, unsigned long default_value);
1888 extern void xmon_mtspr(int spr, unsigned long value);
1889
1890 static int
read_spr(int n,unsigned long * vp)1891 read_spr(int n, unsigned long *vp)
1892 {
1893 unsigned long ret = -1UL;
1894 int ok = 0;
1895
1896 if (setjmp(bus_error_jmp) == 0) {
1897 catch_spr_faults = 1;
1898 sync();
1899
1900 ret = xmon_mfspr(n, *vp);
1901
1902 sync();
1903 *vp = ret;
1904 ok = 1;
1905 }
1906 catch_spr_faults = 0;
1907
1908 return ok;
1909 }
1910
1911 static void
write_spr(int n,unsigned long val)1912 write_spr(int n, unsigned long val)
1913 {
1914 if (xmon_is_ro) {
1915 printf(xmon_ro_msg);
1916 return;
1917 }
1918
1919 if (setjmp(bus_error_jmp) == 0) {
1920 catch_spr_faults = 1;
1921 sync();
1922
1923 xmon_mtspr(n, val);
1924
1925 sync();
1926 } else {
1927 printf("SPR 0x%03x (%4d) Faulted during write\n", n, n);
1928 }
1929 catch_spr_faults = 0;
1930 }
1931
dump_206_sprs(void)1932 static void dump_206_sprs(void)
1933 {
1934 #ifdef CONFIG_PPC64
1935 if (!cpu_has_feature(CPU_FTR_ARCH_206))
1936 return;
1937
1938 /* Actually some of these pre-date 2.06, but whatevs */
1939
1940 printf("srr0 = %.16lx srr1 = %.16lx dsisr = %.8lx\n",
1941 mfspr(SPRN_SRR0), mfspr(SPRN_SRR1), mfspr(SPRN_DSISR));
1942 printf("dscr = %.16lx ppr = %.16lx pir = %.8lx\n",
1943 mfspr(SPRN_DSCR), mfspr(SPRN_PPR), mfspr(SPRN_PIR));
1944 printf("amr = %.16lx uamor = %.16lx\n",
1945 mfspr(SPRN_AMR), mfspr(SPRN_UAMOR));
1946
1947 if (!(mfmsr() & MSR_HV))
1948 return;
1949
1950 printf("sdr1 = %.16lx hdar = %.16lx hdsisr = %.8lx\n",
1951 mfspr(SPRN_SDR1), mfspr(SPRN_HDAR), mfspr(SPRN_HDSISR));
1952 printf("hsrr0 = %.16lx hsrr1 = %.16lx hdec = %.16lx\n",
1953 mfspr(SPRN_HSRR0), mfspr(SPRN_HSRR1), mfspr(SPRN_HDEC));
1954 printf("lpcr = %.16lx pcr = %.16lx lpidr = %.8lx\n",
1955 mfspr(SPRN_LPCR), mfspr(SPRN_PCR), mfspr(SPRN_LPID));
1956 printf("hsprg0 = %.16lx hsprg1 = %.16lx amor = %.16lx\n",
1957 mfspr(SPRN_HSPRG0), mfspr(SPRN_HSPRG1), mfspr(SPRN_AMOR));
1958 printf("dabr = %.16lx dabrx = %.16lx\n",
1959 mfspr(SPRN_DABR), mfspr(SPRN_DABRX));
1960 #endif
1961 }
1962
dump_207_sprs(void)1963 static void dump_207_sprs(void)
1964 {
1965 #ifdef CONFIG_PPC64
1966 unsigned long msr;
1967
1968 if (!cpu_has_feature(CPU_FTR_ARCH_207S))
1969 return;
1970
1971 printf("dpdes = %.16lx tir = %.16lx cir = %.8lx\n",
1972 mfspr(SPRN_DPDES), mfspr(SPRN_TIR), mfspr(SPRN_CIR));
1973
1974 printf("fscr = %.16lx tar = %.16lx pspb = %.8lx\n",
1975 mfspr(SPRN_FSCR), mfspr(SPRN_TAR), mfspr(SPRN_PSPB));
1976
1977 msr = mfmsr();
1978 if (msr & MSR_TM) {
1979 /* Only if TM has been enabled in the kernel */
1980 printf("tfhar = %.16lx tfiar = %.16lx texasr = %.16lx\n",
1981 mfspr(SPRN_TFHAR), mfspr(SPRN_TFIAR),
1982 mfspr(SPRN_TEXASR));
1983 }
1984
1985 printf("mmcr0 = %.16lx mmcr1 = %.16lx mmcr2 = %.16lx\n",
1986 mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCR2));
1987 printf("pmc1 = %.8lx pmc2 = %.8lx pmc3 = %.8lx pmc4 = %.8lx\n",
1988 mfspr(SPRN_PMC1), mfspr(SPRN_PMC2),
1989 mfspr(SPRN_PMC3), mfspr(SPRN_PMC4));
1990 printf("mmcra = %.16lx siar = %.16lx pmc5 = %.8lx\n",
1991 mfspr(SPRN_MMCRA), mfspr(SPRN_SIAR), mfspr(SPRN_PMC5));
1992 printf("sdar = %.16lx sier = %.16lx pmc6 = %.8lx\n",
1993 mfspr(SPRN_SDAR), mfspr(SPRN_SIER), mfspr(SPRN_PMC6));
1994 printf("ebbhr = %.16lx ebbrr = %.16lx bescr = %.16lx\n",
1995 mfspr(SPRN_EBBHR), mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR));
1996 printf("iamr = %.16lx\n", mfspr(SPRN_IAMR));
1997
1998 if (!(msr & MSR_HV))
1999 return;
2000
2001 printf("hfscr = %.16lx dhdes = %.16lx rpr = %.16lx\n",
2002 mfspr(SPRN_HFSCR), mfspr(SPRN_DHDES), mfspr(SPRN_RPR));
2003 printf("dawr0 = %.16lx dawrx0 = %.16lx\n",
2004 mfspr(SPRN_DAWR0), mfspr(SPRN_DAWRX0));
2005 if (nr_wp_slots() > 1) {
2006 printf("dawr1 = %.16lx dawrx1 = %.16lx\n",
2007 mfspr(SPRN_DAWR1), mfspr(SPRN_DAWRX1));
2008 }
2009 printf("ciabr = %.16lx\n", mfspr(SPRN_CIABR));
2010 #endif
2011 }
2012
dump_300_sprs(void)2013 static void dump_300_sprs(void)
2014 {
2015 #ifdef CONFIG_PPC64
2016 bool hv = mfmsr() & MSR_HV;
2017
2018 if (!cpu_has_feature(CPU_FTR_ARCH_300))
2019 return;
2020
2021 printf("pidr = %.16lx tidr = %.16lx\n",
2022 mfspr(SPRN_PID), mfspr(SPRN_TIDR));
2023 printf("psscr = %.16lx\n",
2024 hv ? mfspr(SPRN_PSSCR) : mfspr(SPRN_PSSCR_PR));
2025
2026 if (!hv)
2027 return;
2028
2029 printf("ptcr = %.16lx asdr = %.16lx\n",
2030 mfspr(SPRN_PTCR), mfspr(SPRN_ASDR));
2031 #endif
2032 }
2033
dump_310_sprs(void)2034 static void dump_310_sprs(void)
2035 {
2036 #ifdef CONFIG_PPC64
2037 if (!cpu_has_feature(CPU_FTR_ARCH_31))
2038 return;
2039
2040 printf("mmcr3 = %.16lx, sier2 = %.16lx, sier3 = %.16lx\n",
2041 mfspr(SPRN_MMCR3), mfspr(SPRN_SIER2), mfspr(SPRN_SIER3));
2042
2043 #endif
2044 }
2045
dump_one_spr(int spr,bool show_unimplemented)2046 static void dump_one_spr(int spr, bool show_unimplemented)
2047 {
2048 unsigned long val;
2049
2050 val = 0xdeadbeef;
2051 if (!read_spr(spr, &val)) {
2052 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr);
2053 return;
2054 }
2055
2056 if (val == 0xdeadbeef) {
2057 /* Looks like read was a nop, confirm */
2058 val = 0x0badcafe;
2059 if (!read_spr(spr, &val)) {
2060 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr);
2061 return;
2062 }
2063
2064 if (val == 0x0badcafe) {
2065 if (show_unimplemented)
2066 printf("SPR 0x%03x (%4d) Unimplemented\n", spr, spr);
2067 return;
2068 }
2069 }
2070
2071 printf("SPR 0x%03x (%4d) = 0x%lx\n", spr, spr, val);
2072 }
2073
super_regs(void)2074 static void super_regs(void)
2075 {
2076 static unsigned long regno;
2077 int cmd;
2078 int spr;
2079
2080 cmd = skipbl();
2081
2082 switch (cmd) {
2083 case '\n': {
2084 unsigned long sp, toc;
2085 asm("mr %0,1" : "=r" (sp) :);
2086 asm("mr %0,2" : "=r" (toc) :);
2087
2088 printf("msr = "REG" sprg0 = "REG"\n",
2089 mfmsr(), mfspr(SPRN_SPRG0));
2090 printf("pvr = "REG" sprg1 = "REG"\n",
2091 mfspr(SPRN_PVR), mfspr(SPRN_SPRG1));
2092 printf("dec = "REG" sprg2 = "REG"\n",
2093 mfspr(SPRN_DEC), mfspr(SPRN_SPRG2));
2094 printf("sp = "REG" sprg3 = "REG"\n", sp, mfspr(SPRN_SPRG3));
2095 printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR));
2096
2097 dump_206_sprs();
2098 dump_207_sprs();
2099 dump_300_sprs();
2100 dump_310_sprs();
2101
2102 return;
2103 }
2104 case 'w': {
2105 unsigned long val;
2106 scanhex(®no);
2107 val = 0;
2108 read_spr(regno, &val);
2109 scanhex(&val);
2110 write_spr(regno, val);
2111 dump_one_spr(regno, true);
2112 break;
2113 }
2114 case 'r':
2115 scanhex(®no);
2116 dump_one_spr(regno, true);
2117 break;
2118 case 'a':
2119 /* dump ALL SPRs */
2120 for (spr = 1; spr < 1024; ++spr)
2121 dump_one_spr(spr, false);
2122 break;
2123 }
2124
2125 scannl();
2126 }
2127
2128 /*
2129 * Stuff for reading and writing memory safely
2130 */
2131 static int
mread(unsigned long adrs,void * buf,int size)2132 mread(unsigned long adrs, void *buf, int size)
2133 {
2134 volatile int n;
2135 char *p, *q;
2136
2137 n = 0;
2138 if (setjmp(bus_error_jmp) == 0) {
2139 catch_memory_errors = 1;
2140 sync();
2141 p = (char *)adrs;
2142 q = (char *)buf;
2143 switch (size) {
2144 case 2:
2145 *(u16 *)q = *(u16 *)p;
2146 break;
2147 case 4:
2148 *(u32 *)q = *(u32 *)p;
2149 break;
2150 case 8:
2151 *(u64 *)q = *(u64 *)p;
2152 break;
2153 default:
2154 for( ; n < size; ++n) {
2155 *q++ = *p++;
2156 sync();
2157 }
2158 }
2159 sync();
2160 /* wait a little while to see if we get a machine check */
2161 __delay(200);
2162 n = size;
2163 }
2164 catch_memory_errors = 0;
2165 return n;
2166 }
2167
2168 static int
mwrite(unsigned long adrs,void * buf,int size)2169 mwrite(unsigned long adrs, void *buf, int size)
2170 {
2171 volatile int n;
2172 char *p, *q;
2173
2174 n = 0;
2175
2176 if (xmon_is_ro) {
2177 printf(xmon_ro_msg);
2178 return n;
2179 }
2180
2181 if (setjmp(bus_error_jmp) == 0) {
2182 catch_memory_errors = 1;
2183 sync();
2184 p = (char *) adrs;
2185 q = (char *) buf;
2186 switch (size) {
2187 case 2:
2188 *(u16 *)p = *(u16 *)q;
2189 break;
2190 case 4:
2191 *(u32 *)p = *(u32 *)q;
2192 break;
2193 case 8:
2194 *(u64 *)p = *(u64 *)q;
2195 break;
2196 default:
2197 for ( ; n < size; ++n) {
2198 *p++ = *q++;
2199 sync();
2200 }
2201 }
2202 sync();
2203 /* wait a little while to see if we get a machine check */
2204 __delay(200);
2205 n = size;
2206 } else {
2207 printf("*** Error writing address "REG"\n", adrs + n);
2208 }
2209 catch_memory_errors = 0;
2210 return n;
2211 }
2212
2213 static int
mread_instr(unsigned long adrs,struct ppc_inst * instr)2214 mread_instr(unsigned long adrs, struct ppc_inst *instr)
2215 {
2216 volatile int n;
2217
2218 n = 0;
2219 if (setjmp(bus_error_jmp) == 0) {
2220 catch_memory_errors = 1;
2221 sync();
2222 *instr = ppc_inst_read((struct ppc_inst *)adrs);
2223 sync();
2224 /* wait a little while to see if we get a machine check */
2225 __delay(200);
2226 n = ppc_inst_len(*instr);
2227 }
2228 catch_memory_errors = 0;
2229 return n;
2230 }
2231
2232 static int fault_type;
2233 static int fault_except;
2234 static char *fault_chars[] = { "--", "**", "##" };
2235
handle_fault(struct pt_regs * regs)2236 static int handle_fault(struct pt_regs *regs)
2237 {
2238 fault_except = TRAP(regs);
2239 switch (TRAP(regs)) {
2240 case 0x200:
2241 fault_type = 0;
2242 break;
2243 case 0x300:
2244 case 0x380:
2245 fault_type = 1;
2246 break;
2247 default:
2248 fault_type = 2;
2249 }
2250
2251 longjmp(bus_error_jmp, 1);
2252
2253 return 0;
2254 }
2255
2256 #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t))
2257
2258 static void
byterev(unsigned char * val,int size)2259 byterev(unsigned char *val, int size)
2260 {
2261 int t;
2262
2263 switch (size) {
2264 case 2:
2265 SWAP(val[0], val[1], t);
2266 break;
2267 case 4:
2268 SWAP(val[0], val[3], t);
2269 SWAP(val[1], val[2], t);
2270 break;
2271 case 8: /* is there really any use for this? */
2272 SWAP(val[0], val[7], t);
2273 SWAP(val[1], val[6], t);
2274 SWAP(val[2], val[5], t);
2275 SWAP(val[3], val[4], t);
2276 break;
2277 }
2278 }
2279
2280 static int brev;
2281 static int mnoread;
2282
2283 static char *memex_help_string =
2284 "Memory examine command usage:\n"
2285 "m [addr] [flags] examine/change memory\n"
2286 " addr is optional. will start where left off.\n"
2287 " flags may include chars from this set:\n"
2288 " b modify by bytes (default)\n"
2289 " w modify by words (2 byte)\n"
2290 " l modify by longs (4 byte)\n"
2291 " d modify by doubleword (8 byte)\n"
2292 " r toggle reverse byte order mode\n"
2293 " n do not read memory (for i/o spaces)\n"
2294 " . ok to read (default)\n"
2295 "NOTE: flags are saved as defaults\n"
2296 "";
2297
2298 static char *memex_subcmd_help_string =
2299 "Memory examine subcommands:\n"
2300 " hexval write this val to current location\n"
2301 " 'string' write chars from string to this location\n"
2302 " ' increment address\n"
2303 " ^ decrement address\n"
2304 " / increment addr by 0x10. //=0x100, ///=0x1000, etc\n"
2305 " \\ decrement addr by 0x10. \\\\=0x100, \\\\\\=0x1000, etc\n"
2306 " ` clear no-read flag\n"
2307 " ; stay at this addr\n"
2308 " v change to byte mode\n"
2309 " w change to word (2 byte) mode\n"
2310 " l change to long (4 byte) mode\n"
2311 " u change to doubleword (8 byte) mode\n"
2312 " m addr change current addr\n"
2313 " n toggle no-read flag\n"
2314 " r toggle byte reverse flag\n"
2315 " < count back up count bytes\n"
2316 " > count skip forward count bytes\n"
2317 " x exit this mode\n"
2318 "";
2319
2320 static void
memex(void)2321 memex(void)
2322 {
2323 int cmd, inc, i, nslash;
2324 unsigned long n;
2325 unsigned char val[16];
2326
2327 scanhex((void *)&adrs);
2328 cmd = skipbl();
2329 if (cmd == '?') {
2330 printf(memex_help_string);
2331 return;
2332 } else {
2333 termch = cmd;
2334 }
2335 last_cmd = "m\n";
2336 while ((cmd = skipbl()) != '\n') {
2337 switch( cmd ){
2338 case 'b': size = 1; break;
2339 case 'w': size = 2; break;
2340 case 'l': size = 4; break;
2341 case 'd': size = 8; break;
2342 case 'r': brev = !brev; break;
2343 case 'n': mnoread = 1; break;
2344 case '.': mnoread = 0; break;
2345 }
2346 }
2347 if( size <= 0 )
2348 size = 1;
2349 else if( size > 8 )
2350 size = 8;
2351 for(;;){
2352 if (!mnoread)
2353 n = mread(adrs, val, size);
2354 printf(REG"%c", adrs, brev? 'r': ' ');
2355 if (!mnoread) {
2356 if (brev)
2357 byterev(val, size);
2358 putchar(' ');
2359 for (i = 0; i < n; ++i)
2360 printf("%.2x", val[i]);
2361 for (; i < size; ++i)
2362 printf("%s", fault_chars[fault_type]);
2363 }
2364 putchar(' ');
2365 inc = size;
2366 nslash = 0;
2367 for(;;){
2368 if( scanhex(&n) ){
2369 for (i = 0; i < size; ++i)
2370 val[i] = n >> (i * 8);
2371 if (!brev)
2372 byterev(val, size);
2373 mwrite(adrs, val, size);
2374 inc = size;
2375 }
2376 cmd = skipbl();
2377 if (cmd == '\n')
2378 break;
2379 inc = 0;
2380 switch (cmd) {
2381 case '\'':
2382 for(;;){
2383 n = inchar();
2384 if( n == '\\' )
2385 n = bsesc();
2386 else if( n == '\'' )
2387 break;
2388 for (i = 0; i < size; ++i)
2389 val[i] = n >> (i * 8);
2390 if (!brev)
2391 byterev(val, size);
2392 mwrite(adrs, val, size);
2393 adrs += size;
2394 }
2395 adrs -= size;
2396 inc = size;
2397 break;
2398 case ',':
2399 adrs += size;
2400 break;
2401 case '.':
2402 mnoread = 0;
2403 break;
2404 case ';':
2405 break;
2406 case 'x':
2407 case EOF:
2408 scannl();
2409 return;
2410 case 'b':
2411 case 'v':
2412 size = 1;
2413 break;
2414 case 'w':
2415 size = 2;
2416 break;
2417 case 'l':
2418 size = 4;
2419 break;
2420 case 'u':
2421 size = 8;
2422 break;
2423 case '^':
2424 adrs -= size;
2425 break;
2426 case '/':
2427 if (nslash > 0)
2428 adrs -= 1 << nslash;
2429 else
2430 nslash = 0;
2431 nslash += 4;
2432 adrs += 1 << nslash;
2433 break;
2434 case '\\':
2435 if (nslash < 0)
2436 adrs += 1 << -nslash;
2437 else
2438 nslash = 0;
2439 nslash -= 4;
2440 adrs -= 1 << -nslash;
2441 break;
2442 case 'm':
2443 scanhex((void *)&adrs);
2444 break;
2445 case 'n':
2446 mnoread = 1;
2447 break;
2448 case 'r':
2449 brev = !brev;
2450 break;
2451 case '<':
2452 n = size;
2453 scanhex(&n);
2454 adrs -= n;
2455 break;
2456 case '>':
2457 n = size;
2458 scanhex(&n);
2459 adrs += n;
2460 break;
2461 case '?':
2462 printf(memex_subcmd_help_string);
2463 break;
2464 }
2465 }
2466 adrs += inc;
2467 }
2468 }
2469
2470 static int
bsesc(void)2471 bsesc(void)
2472 {
2473 int c;
2474
2475 c = inchar();
2476 switch( c ){
2477 case 'n': c = '\n'; break;
2478 case 'r': c = '\r'; break;
2479 case 'b': c = '\b'; break;
2480 case 't': c = '\t'; break;
2481 }
2482 return c;
2483 }
2484
xmon_rawdump(unsigned long adrs,long ndump)2485 static void xmon_rawdump (unsigned long adrs, long ndump)
2486 {
2487 long n, m, r, nr;
2488 unsigned char temp[16];
2489
2490 for (n = ndump; n > 0;) {
2491 r = n < 16? n: 16;
2492 nr = mread(adrs, temp, r);
2493 adrs += nr;
2494 for (m = 0; m < r; ++m) {
2495 if (m < nr)
2496 printf("%.2x", temp[m]);
2497 else
2498 printf("%s", fault_chars[fault_type]);
2499 }
2500 n -= r;
2501 if (nr < r)
2502 break;
2503 }
2504 printf("\n");
2505 }
2506
dump_tracing(void)2507 static void dump_tracing(void)
2508 {
2509 int c;
2510
2511 c = inchar();
2512 if (c == 'c')
2513 ftrace_dump(DUMP_ORIG);
2514 else
2515 ftrace_dump(DUMP_ALL);
2516 }
2517
2518 #ifdef CONFIG_PPC64
dump_one_paca(int cpu)2519 static void dump_one_paca(int cpu)
2520 {
2521 struct paca_struct *p;
2522 #ifdef CONFIG_PPC_BOOK3S_64
2523 int i = 0;
2524 #endif
2525
2526 if (setjmp(bus_error_jmp) != 0) {
2527 printf("*** Error dumping paca for cpu 0x%x!\n", cpu);
2528 return;
2529 }
2530
2531 catch_memory_errors = 1;
2532 sync();
2533
2534 p = paca_ptrs[cpu];
2535
2536 printf("paca for cpu 0x%x @ %px:\n", cpu, p);
2537
2538 printf(" %-*s = %s\n", 25, "possible", cpu_possible(cpu) ? "yes" : "no");
2539 printf(" %-*s = %s\n", 25, "present", cpu_present(cpu) ? "yes" : "no");
2540 printf(" %-*s = %s\n", 25, "online", cpu_online(cpu) ? "yes" : "no");
2541
2542 #define DUMP(paca, name, format) \
2543 printf(" %-*s = "format"\t(0x%lx)\n", 25, #name, 18, paca->name, \
2544 offsetof(struct paca_struct, name));
2545
2546 DUMP(p, lock_token, "%#-*x");
2547 DUMP(p, paca_index, "%#-*x");
2548 DUMP(p, kernel_toc, "%#-*llx");
2549 DUMP(p, kernelbase, "%#-*llx");
2550 DUMP(p, kernel_msr, "%#-*llx");
2551 DUMP(p, emergency_sp, "%-*px");
2552 #ifdef CONFIG_PPC_BOOK3S_64
2553 DUMP(p, nmi_emergency_sp, "%-*px");
2554 DUMP(p, mc_emergency_sp, "%-*px");
2555 DUMP(p, in_nmi, "%#-*x");
2556 DUMP(p, in_mce, "%#-*x");
2557 DUMP(p, hmi_event_available, "%#-*x");
2558 #endif
2559 DUMP(p, data_offset, "%#-*llx");
2560 DUMP(p, hw_cpu_id, "%#-*x");
2561 DUMP(p, cpu_start, "%#-*x");
2562 DUMP(p, kexec_state, "%#-*x");
2563 #ifdef CONFIG_PPC_BOOK3S_64
2564 if (!early_radix_enabled()) {
2565 for (i = 0; i < SLB_NUM_BOLTED; i++) {
2566 u64 esid, vsid;
2567
2568 if (!p->slb_shadow_ptr)
2569 continue;
2570
2571 esid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].esid);
2572 vsid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].vsid);
2573
2574 if (esid || vsid) {
2575 printf(" %-*s[%d] = 0x%016llx 0x%016llx\n",
2576 22, "slb_shadow", i, esid, vsid);
2577 }
2578 }
2579 DUMP(p, vmalloc_sllp, "%#-*x");
2580 DUMP(p, stab_rr, "%#-*x");
2581 DUMP(p, slb_used_bitmap, "%#-*x");
2582 DUMP(p, slb_kern_bitmap, "%#-*x");
2583
2584 if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) {
2585 DUMP(p, slb_cache_ptr, "%#-*x");
2586 for (i = 0; i < SLB_CACHE_ENTRIES; i++)
2587 printf(" %-*s[%d] = 0x%016x\n",
2588 22, "slb_cache", i, p->slb_cache[i]);
2589 }
2590 }
2591
2592 DUMP(p, rfi_flush_fallback_area, "%-*px");
2593 #endif
2594 DUMP(p, dscr_default, "%#-*llx");
2595 #ifdef CONFIG_PPC_BOOK3E
2596 DUMP(p, pgd, "%-*px");
2597 DUMP(p, kernel_pgd, "%-*px");
2598 DUMP(p, tcd_ptr, "%-*px");
2599 DUMP(p, mc_kstack, "%-*px");
2600 DUMP(p, crit_kstack, "%-*px");
2601 DUMP(p, dbg_kstack, "%-*px");
2602 #endif
2603 DUMP(p, __current, "%-*px");
2604 DUMP(p, kstack, "%#-*llx");
2605 printf(" %-*s = 0x%016llx\n", 25, "kstack_base", p->kstack & ~(THREAD_SIZE - 1));
2606 #ifdef CONFIG_STACKPROTECTOR
2607 DUMP(p, canary, "%#-*lx");
2608 #endif
2609 DUMP(p, saved_r1, "%#-*llx");
2610 #ifdef CONFIG_PPC_BOOK3E
2611 DUMP(p, trap_save, "%#-*x");
2612 #endif
2613 DUMP(p, irq_soft_mask, "%#-*x");
2614 DUMP(p, irq_happened, "%#-*x");
2615 #ifdef CONFIG_MMIOWB
2616 DUMP(p, mmiowb_state.nesting_count, "%#-*x");
2617 DUMP(p, mmiowb_state.mmiowb_pending, "%#-*x");
2618 #endif
2619 DUMP(p, irq_work_pending, "%#-*x");
2620 DUMP(p, sprg_vdso, "%#-*llx");
2621
2622 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2623 DUMP(p, tm_scratch, "%#-*llx");
2624 #endif
2625
2626 #ifdef CONFIG_PPC_POWERNV
2627 DUMP(p, idle_state, "%#-*lx");
2628 if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) {
2629 DUMP(p, thread_idle_state, "%#-*x");
2630 DUMP(p, subcore_sibling_mask, "%#-*x");
2631 } else {
2632 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
2633 DUMP(p, requested_psscr, "%#-*llx");
2634 DUMP(p, dont_stop.counter, "%#-*x");
2635 #endif
2636 }
2637 #endif
2638
2639 DUMP(p, accounting.utime, "%#-*lx");
2640 DUMP(p, accounting.stime, "%#-*lx");
2641 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
2642 DUMP(p, accounting.utime_scaled, "%#-*lx");
2643 #endif
2644 DUMP(p, accounting.starttime, "%#-*lx");
2645 DUMP(p, accounting.starttime_user, "%#-*lx");
2646 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
2647 DUMP(p, accounting.startspurr, "%#-*lx");
2648 DUMP(p, accounting.utime_sspurr, "%#-*lx");
2649 #endif
2650 DUMP(p, accounting.steal_time, "%#-*lx");
2651 #undef DUMP
2652
2653 catch_memory_errors = 0;
2654 sync();
2655 }
2656
dump_all_pacas(void)2657 static void dump_all_pacas(void)
2658 {
2659 int cpu;
2660
2661 if (num_possible_cpus() == 0) {
2662 printf("No possible cpus, use 'dp #' to dump individual cpus\n");
2663 return;
2664 }
2665
2666 for_each_possible_cpu(cpu)
2667 dump_one_paca(cpu);
2668 }
2669
dump_pacas(void)2670 static void dump_pacas(void)
2671 {
2672 unsigned long num;
2673 int c;
2674
2675 c = inchar();
2676 if (c == 'a') {
2677 dump_all_pacas();
2678 return;
2679 }
2680
2681 termch = c; /* Put c back, it wasn't 'a' */
2682
2683 if (scanhex(&num))
2684 dump_one_paca(num);
2685 else
2686 dump_one_paca(xmon_owner);
2687 }
2688 #endif
2689
2690 #ifdef CONFIG_PPC_POWERNV
dump_one_xive(int cpu)2691 static void dump_one_xive(int cpu)
2692 {
2693 unsigned int hwid = get_hard_smp_processor_id(cpu);
2694 bool hv = cpu_has_feature(CPU_FTR_HVMODE);
2695
2696 if (hv) {
2697 opal_xive_dump(XIVE_DUMP_TM_HYP, hwid);
2698 opal_xive_dump(XIVE_DUMP_TM_POOL, hwid);
2699 opal_xive_dump(XIVE_DUMP_TM_OS, hwid);
2700 opal_xive_dump(XIVE_DUMP_TM_USER, hwid);
2701 opal_xive_dump(XIVE_DUMP_VP, hwid);
2702 opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid);
2703 }
2704
2705 if (setjmp(bus_error_jmp) != 0) {
2706 catch_memory_errors = 0;
2707 printf("*** Error dumping xive on cpu %d\n", cpu);
2708 return;
2709 }
2710
2711 catch_memory_errors = 1;
2712 sync();
2713 xmon_xive_do_dump(cpu);
2714 sync();
2715 __delay(200);
2716 catch_memory_errors = 0;
2717 }
2718
dump_all_xives(void)2719 static void dump_all_xives(void)
2720 {
2721 int cpu;
2722
2723 if (num_possible_cpus() == 0) {
2724 printf("No possible cpus, use 'dx #' to dump individual cpus\n");
2725 return;
2726 }
2727
2728 for_each_possible_cpu(cpu)
2729 dump_one_xive(cpu);
2730 }
2731
dump_one_xive_irq(u32 num,struct irq_data * d)2732 static void dump_one_xive_irq(u32 num, struct irq_data *d)
2733 {
2734 xmon_xive_get_irq_config(num, d);
2735 }
2736
dump_all_xive_irq(void)2737 static void dump_all_xive_irq(void)
2738 {
2739 unsigned int i;
2740 struct irq_desc *desc;
2741
2742 for_each_irq_desc(i, desc) {
2743 struct irq_data *d = irq_desc_get_irq_data(desc);
2744 unsigned int hwirq;
2745
2746 if (!d)
2747 continue;
2748
2749 hwirq = (unsigned int)irqd_to_hwirq(d);
2750 /* IPIs are special (HW number 0) */
2751 if (hwirq)
2752 dump_one_xive_irq(hwirq, d);
2753 }
2754 }
2755
dump_xives(void)2756 static void dump_xives(void)
2757 {
2758 unsigned long num;
2759 int c;
2760
2761 if (!xive_enabled()) {
2762 printf("Xive disabled on this system\n");
2763 return;
2764 }
2765
2766 c = inchar();
2767 if (c == 'a') {
2768 dump_all_xives();
2769 return;
2770 } else if (c == 'i') {
2771 if (scanhex(&num))
2772 dump_one_xive_irq(num, NULL);
2773 else
2774 dump_all_xive_irq();
2775 return;
2776 }
2777
2778 termch = c; /* Put c back, it wasn't 'a' */
2779
2780 if (scanhex(&num))
2781 dump_one_xive(num);
2782 else
2783 dump_one_xive(xmon_owner);
2784 }
2785 #endif /* CONFIG_PPC_POWERNV */
2786
dump_by_size(unsigned long addr,long count,int size)2787 static void dump_by_size(unsigned long addr, long count, int size)
2788 {
2789 unsigned char temp[16];
2790 int i, j;
2791 u64 val;
2792
2793 count = ALIGN(count, 16);
2794
2795 for (i = 0; i < count; i += 16, addr += 16) {
2796 printf(REG, addr);
2797
2798 if (mread(addr, temp, 16) != 16) {
2799 printf("\nFaulted reading %d bytes from 0x"REG"\n", 16, addr);
2800 return;
2801 }
2802
2803 for (j = 0; j < 16; j += size) {
2804 putchar(' ');
2805 switch (size) {
2806 case 1: val = temp[j]; break;
2807 case 2: val = *(u16 *)&temp[j]; break;
2808 case 4: val = *(u32 *)&temp[j]; break;
2809 case 8: val = *(u64 *)&temp[j]; break;
2810 default: val = 0;
2811 }
2812
2813 printf("%0*llx", size * 2, val);
2814 }
2815 printf(" |");
2816 for (j = 0; j < 16; ++j) {
2817 val = temp[j];
2818 putchar(' ' <= val && val <= '~' ? val : '.');
2819 }
2820 printf("|\n");
2821 }
2822 }
2823
2824 static void
dump(void)2825 dump(void)
2826 {
2827 static char last[] = { "d?\n" };
2828 int c;
2829
2830 c = inchar();
2831
2832 #ifdef CONFIG_PPC64
2833 if (c == 'p') {
2834 xmon_start_pagination();
2835 dump_pacas();
2836 xmon_end_pagination();
2837 return;
2838 }
2839 #endif
2840 #ifdef CONFIG_PPC_POWERNV
2841 if (c == 'x') {
2842 xmon_start_pagination();
2843 dump_xives();
2844 xmon_end_pagination();
2845 return;
2846 }
2847 #endif
2848
2849 if (c == 't') {
2850 dump_tracing();
2851 return;
2852 }
2853
2854 if (c == '\n')
2855 termch = c;
2856
2857 scanhex((void *)&adrs);
2858 if (termch != '\n')
2859 termch = 0;
2860 if (c == 'i') {
2861 scanhex(&nidump);
2862 if (nidump == 0)
2863 nidump = 16;
2864 else if (nidump > MAX_IDUMP)
2865 nidump = MAX_IDUMP;
2866 adrs += ppc_inst_dump(adrs, nidump, 1);
2867 last_cmd = "di\n";
2868 } else if (c == 'l') {
2869 dump_log_buf();
2870 } else if (c == 'o') {
2871 dump_opal_msglog();
2872 } else if (c == 'v') {
2873 /* dump virtual to physical translation */
2874 show_pte(adrs);
2875 } else if (c == 'r') {
2876 scanhex(&ndump);
2877 if (ndump == 0)
2878 ndump = 64;
2879 xmon_rawdump(adrs, ndump);
2880 adrs += ndump;
2881 last_cmd = "dr\n";
2882 } else {
2883 scanhex(&ndump);
2884 if (ndump == 0)
2885 ndump = 64;
2886 else if (ndump > MAX_DUMP)
2887 ndump = MAX_DUMP;
2888
2889 switch (c) {
2890 case '8':
2891 case '4':
2892 case '2':
2893 case '1':
2894 ndump = ALIGN(ndump, 16);
2895 dump_by_size(adrs, ndump, c - '0');
2896 last[1] = c;
2897 last_cmd = last;
2898 break;
2899 default:
2900 prdump(adrs, ndump);
2901 last_cmd = "d\n";
2902 }
2903
2904 adrs += ndump;
2905 }
2906 }
2907
2908 static void
prdump(unsigned long adrs,long ndump)2909 prdump(unsigned long adrs, long ndump)
2910 {
2911 long n, m, c, r, nr;
2912 unsigned char temp[16];
2913
2914 for (n = ndump; n > 0;) {
2915 printf(REG, adrs);
2916 putchar(' ');
2917 r = n < 16? n: 16;
2918 nr = mread(adrs, temp, r);
2919 adrs += nr;
2920 for (m = 0; m < r; ++m) {
2921 if ((m & (sizeof(long) - 1)) == 0 && m > 0)
2922 putchar(' ');
2923 if (m < nr)
2924 printf("%.2x", temp[m]);
2925 else
2926 printf("%s", fault_chars[fault_type]);
2927 }
2928 for (; m < 16; ++m) {
2929 if ((m & (sizeof(long) - 1)) == 0)
2930 putchar(' ');
2931 printf(" ");
2932 }
2933 printf(" |");
2934 for (m = 0; m < r; ++m) {
2935 if (m < nr) {
2936 c = temp[m];
2937 putchar(' ' <= c && c <= '~'? c: '.');
2938 } else
2939 putchar(' ');
2940 }
2941 n -= r;
2942 for (; m < 16; ++m)
2943 putchar(' ');
2944 printf("|\n");
2945 if (nr < r)
2946 break;
2947 }
2948 }
2949
2950 typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr);
2951
2952 static int
generic_inst_dump(unsigned long adr,long count,int praddr,instruction_dump_func dump_func)2953 generic_inst_dump(unsigned long adr, long count, int praddr,
2954 instruction_dump_func dump_func)
2955 {
2956 int nr, dotted;
2957 unsigned long first_adr;
2958 struct ppc_inst inst, last_inst = ppc_inst(0);
2959
2960 dotted = 0;
2961 for (first_adr = adr; count > 0; --count, adr += ppc_inst_len(inst)) {
2962 nr = mread_instr(adr, &inst);
2963 if (nr == 0) {
2964 if (praddr) {
2965 const char *x = fault_chars[fault_type];
2966 printf(REG" %s%s%s%s\n", adr, x, x, x, x);
2967 }
2968 break;
2969 }
2970 if (adr > first_adr && ppc_inst_equal(inst, last_inst)) {
2971 if (!dotted) {
2972 printf(" ...\n");
2973 dotted = 1;
2974 }
2975 continue;
2976 }
2977 dotted = 0;
2978 last_inst = inst;
2979 if (praddr)
2980 printf(REG" %s", adr, ppc_inst_as_str(inst));
2981 printf("\t");
2982 if (!ppc_inst_prefixed(inst))
2983 dump_func(ppc_inst_val(inst), adr);
2984 else
2985 dump_func(ppc_inst_as_u64(inst), adr);
2986 printf("\n");
2987 }
2988 return adr - first_adr;
2989 }
2990
2991 static int
ppc_inst_dump(unsigned long adr,long count,int praddr)2992 ppc_inst_dump(unsigned long adr, long count, int praddr)
2993 {
2994 return generic_inst_dump(adr, count, praddr, print_insn_powerpc);
2995 }
2996
2997 void
print_address(unsigned long addr)2998 print_address(unsigned long addr)
2999 {
3000 xmon_print_symbol(addr, "\t# ", "");
3001 }
3002
3003 static void
dump_log_buf(void)3004 dump_log_buf(void)
3005 {
3006 struct kmsg_dumper dumper = { .active = 1 };
3007 unsigned char buf[128];
3008 size_t len;
3009
3010 if (setjmp(bus_error_jmp) != 0) {
3011 printf("Error dumping printk buffer!\n");
3012 return;
3013 }
3014
3015 catch_memory_errors = 1;
3016 sync();
3017
3018 kmsg_dump_rewind_nolock(&dumper);
3019 xmon_start_pagination();
3020 while (kmsg_dump_get_line_nolock(&dumper, false, buf, sizeof(buf), &len)) {
3021 buf[len] = '\0';
3022 printf("%s", buf);
3023 }
3024 xmon_end_pagination();
3025
3026 sync();
3027 /* wait a little while to see if we get a machine check */
3028 __delay(200);
3029 catch_memory_errors = 0;
3030 }
3031
3032 #ifdef CONFIG_PPC_POWERNV
dump_opal_msglog(void)3033 static void dump_opal_msglog(void)
3034 {
3035 unsigned char buf[128];
3036 ssize_t res;
3037 loff_t pos = 0;
3038
3039 if (!firmware_has_feature(FW_FEATURE_OPAL)) {
3040 printf("Machine is not running OPAL firmware.\n");
3041 return;
3042 }
3043
3044 if (setjmp(bus_error_jmp) != 0) {
3045 printf("Error dumping OPAL msglog!\n");
3046 return;
3047 }
3048
3049 catch_memory_errors = 1;
3050 sync();
3051
3052 xmon_start_pagination();
3053 while ((res = opal_msglog_copy(buf, pos, sizeof(buf) - 1))) {
3054 if (res < 0) {
3055 printf("Error dumping OPAL msglog! Error: %zd\n", res);
3056 break;
3057 }
3058 buf[res] = '\0';
3059 printf("%s", buf);
3060 pos += res;
3061 }
3062 xmon_end_pagination();
3063
3064 sync();
3065 /* wait a little while to see if we get a machine check */
3066 __delay(200);
3067 catch_memory_errors = 0;
3068 }
3069 #endif
3070
3071 /*
3072 * Memory operations - move, set, print differences
3073 */
3074 static unsigned long mdest; /* destination address */
3075 static unsigned long msrc; /* source address */
3076 static unsigned long mval; /* byte value to set memory to */
3077 static unsigned long mcount; /* # bytes to affect */
3078 static unsigned long mdiffs; /* max # differences to print */
3079
3080 static void
memops(int cmd)3081 memops(int cmd)
3082 {
3083 scanhex((void *)&mdest);
3084 if( termch != '\n' )
3085 termch = 0;
3086 scanhex((void *)(cmd == 's'? &mval: &msrc));
3087 if( termch != '\n' )
3088 termch = 0;
3089 scanhex((void *)&mcount);
3090 switch( cmd ){
3091 case 'm':
3092 if (xmon_is_ro) {
3093 printf(xmon_ro_msg);
3094 break;
3095 }
3096 memmove((void *)mdest, (void *)msrc, mcount);
3097 break;
3098 case 's':
3099 if (xmon_is_ro) {
3100 printf(xmon_ro_msg);
3101 break;
3102 }
3103 memset((void *)mdest, mval, mcount);
3104 break;
3105 case 'd':
3106 if( termch != '\n' )
3107 termch = 0;
3108 scanhex((void *)&mdiffs);
3109 memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs);
3110 break;
3111 }
3112 }
3113
3114 static void
memdiffs(unsigned char * p1,unsigned char * p2,unsigned nb,unsigned maxpr)3115 memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr)
3116 {
3117 unsigned n, prt;
3118
3119 prt = 0;
3120 for( n = nb; n > 0; --n )
3121 if( *p1++ != *p2++ )
3122 if( ++prt <= maxpr )
3123 printf("%px %.2x # %px %.2x\n", p1 - 1,
3124 p1[-1], p2 - 1, p2[-1]);
3125 if( prt > maxpr )
3126 printf("Total of %d differences\n", prt);
3127 }
3128
3129 static unsigned mend;
3130 static unsigned mask;
3131
3132 static void
memlocate(void)3133 memlocate(void)
3134 {
3135 unsigned a, n;
3136 unsigned char val[4];
3137
3138 last_cmd = "ml";
3139 scanhex((void *)&mdest);
3140 if (termch != '\n') {
3141 termch = 0;
3142 scanhex((void *)&mend);
3143 if (termch != '\n') {
3144 termch = 0;
3145 scanhex((void *)&mval);
3146 mask = ~0;
3147 if (termch != '\n') termch = 0;
3148 scanhex((void *)&mask);
3149 }
3150 }
3151 n = 0;
3152 for (a = mdest; a < mend; a += 4) {
3153 if (mread(a, val, 4) == 4
3154 && ((GETWORD(val) ^ mval) & mask) == 0) {
3155 printf("%.16x: %.16x\n", a, GETWORD(val));
3156 if (++n >= 10)
3157 break;
3158 }
3159 }
3160 }
3161
3162 static unsigned long mskip = 0x1000;
3163 static unsigned long mlim = 0xffffffff;
3164
3165 static void
memzcan(void)3166 memzcan(void)
3167 {
3168 unsigned char v;
3169 unsigned a;
3170 int ok, ook;
3171
3172 scanhex(&mdest);
3173 if (termch != '\n') termch = 0;
3174 scanhex(&mskip);
3175 if (termch != '\n') termch = 0;
3176 scanhex(&mlim);
3177 ook = 0;
3178 for (a = mdest; a < mlim; a += mskip) {
3179 ok = mread(a, &v, 1);
3180 if (ok && !ook) {
3181 printf("%.8x .. ", a);
3182 } else if (!ok && ook)
3183 printf("%.8lx\n", a - mskip);
3184 ook = ok;
3185 if (a + mskip < a)
3186 break;
3187 }
3188 if (ook)
3189 printf("%.8lx\n", a - mskip);
3190 }
3191
show_task(struct task_struct * tsk)3192 static void show_task(struct task_struct *tsk)
3193 {
3194 char state;
3195
3196 /*
3197 * Cloned from kdb_task_state_char(), which is not entirely
3198 * appropriate for calling from xmon. This could be moved
3199 * to a common, generic, routine used by both.
3200 */
3201 state = (tsk->state == 0) ? 'R' :
3202 (tsk->state < 0) ? 'U' :
3203 (tsk->state & TASK_UNINTERRUPTIBLE) ? 'D' :
3204 (tsk->state & TASK_STOPPED) ? 'T' :
3205 (tsk->state & TASK_TRACED) ? 'C' :
3206 (tsk->exit_state & EXIT_ZOMBIE) ? 'Z' :
3207 (tsk->exit_state & EXIT_DEAD) ? 'E' :
3208 (tsk->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
3209
3210 printf("%16px %16lx %16px %6d %6d %c %2d %s\n", tsk,
3211 tsk->thread.ksp, tsk->thread.regs,
3212 tsk->pid, rcu_dereference(tsk->parent)->pid,
3213 state, task_cpu(tsk),
3214 tsk->comm);
3215 }
3216
3217 #ifdef CONFIG_PPC_BOOK3S_64
format_pte(void * ptep,unsigned long pte)3218 static void format_pte(void *ptep, unsigned long pte)
3219 {
3220 pte_t entry = __pte(pte);
3221
3222 printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte);
3223 printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK);
3224
3225 printf("Flags = %s%s%s%s%s\n",
3226 pte_young(entry) ? "Accessed " : "",
3227 pte_dirty(entry) ? "Dirty " : "",
3228 pte_read(entry) ? "Read " : "",
3229 pte_write(entry) ? "Write " : "",
3230 pte_exec(entry) ? "Exec " : "");
3231 }
3232
show_pte(unsigned long addr)3233 static void show_pte(unsigned long addr)
3234 {
3235 unsigned long tskv = 0;
3236 struct task_struct *tsk = NULL;
3237 struct mm_struct *mm;
3238 pgd_t *pgdp;
3239 p4d_t *p4dp;
3240 pud_t *pudp;
3241 pmd_t *pmdp;
3242 pte_t *ptep;
3243
3244 if (!scanhex(&tskv))
3245 mm = &init_mm;
3246 else
3247 tsk = (struct task_struct *)tskv;
3248
3249 if (tsk == NULL)
3250 mm = &init_mm;
3251 else
3252 mm = tsk->active_mm;
3253
3254 if (setjmp(bus_error_jmp) != 0) {
3255 catch_memory_errors = 0;
3256 printf("*** Error dumping pte for task %px\n", tsk);
3257 return;
3258 }
3259
3260 catch_memory_errors = 1;
3261 sync();
3262
3263 if (mm == &init_mm)
3264 pgdp = pgd_offset_k(addr);
3265 else
3266 pgdp = pgd_offset(mm, addr);
3267
3268 p4dp = p4d_offset(pgdp, addr);
3269
3270 if (p4d_none(*p4dp)) {
3271 printf("No valid P4D\n");
3272 return;
3273 }
3274
3275 if (p4d_is_leaf(*p4dp)) {
3276 format_pte(p4dp, p4d_val(*p4dp));
3277 return;
3278 }
3279
3280 printf("p4dp @ 0x%px = 0x%016lx\n", p4dp, p4d_val(*p4dp));
3281
3282 pudp = pud_offset(p4dp, addr);
3283
3284 if (pud_none(*pudp)) {
3285 printf("No valid PUD\n");
3286 return;
3287 }
3288
3289 if (pud_is_leaf(*pudp)) {
3290 format_pte(pudp, pud_val(*pudp));
3291 return;
3292 }
3293
3294 printf("pudp @ 0x%px = 0x%016lx\n", pudp, pud_val(*pudp));
3295
3296 pmdp = pmd_offset(pudp, addr);
3297
3298 if (pmd_none(*pmdp)) {
3299 printf("No valid PMD\n");
3300 return;
3301 }
3302
3303 if (pmd_is_leaf(*pmdp)) {
3304 format_pte(pmdp, pmd_val(*pmdp));
3305 return;
3306 }
3307 printf("pmdp @ 0x%px = 0x%016lx\n", pmdp, pmd_val(*pmdp));
3308
3309 ptep = pte_offset_map(pmdp, addr);
3310 if (pte_none(*ptep)) {
3311 printf("no valid PTE\n");
3312 return;
3313 }
3314
3315 format_pte(ptep, pte_val(*ptep));
3316
3317 sync();
3318 __delay(200);
3319 catch_memory_errors = 0;
3320 }
3321 #else
show_pte(unsigned long addr)3322 static void show_pte(unsigned long addr)
3323 {
3324 printf("show_pte not yet implemented\n");
3325 }
3326 #endif /* CONFIG_PPC_BOOK3S_64 */
3327
show_tasks(void)3328 static void show_tasks(void)
3329 {
3330 unsigned long tskv;
3331 struct task_struct *tsk = NULL;
3332
3333 printf(" task_struct ->thread.ksp ->thread.regs PID PPID S P CMD\n");
3334
3335 if (scanhex(&tskv))
3336 tsk = (struct task_struct *)tskv;
3337
3338 if (setjmp(bus_error_jmp) != 0) {
3339 catch_memory_errors = 0;
3340 printf("*** Error dumping task %px\n", tsk);
3341 return;
3342 }
3343
3344 catch_memory_errors = 1;
3345 sync();
3346
3347 if (tsk)
3348 show_task(tsk);
3349 else
3350 for_each_process(tsk)
3351 show_task(tsk);
3352
3353 sync();
3354 __delay(200);
3355 catch_memory_errors = 0;
3356 }
3357
proccall(void)3358 static void proccall(void)
3359 {
3360 unsigned long args[8];
3361 unsigned long ret;
3362 int i;
3363 typedef unsigned long (*callfunc_t)(unsigned long, unsigned long,
3364 unsigned long, unsigned long, unsigned long,
3365 unsigned long, unsigned long, unsigned long);
3366 callfunc_t func;
3367
3368 if (!scanhex(&adrs))
3369 return;
3370 if (termch != '\n')
3371 termch = 0;
3372 for (i = 0; i < 8; ++i)
3373 args[i] = 0;
3374 for (i = 0; i < 8; ++i) {
3375 if (!scanhex(&args[i]) || termch == '\n')
3376 break;
3377 termch = 0;
3378 }
3379 func = (callfunc_t) adrs;
3380 ret = 0;
3381 if (setjmp(bus_error_jmp) == 0) {
3382 catch_memory_errors = 1;
3383 sync();
3384 ret = func(args[0], args[1], args[2], args[3],
3385 args[4], args[5], args[6], args[7]);
3386 sync();
3387 printf("return value is 0x%lx\n", ret);
3388 } else {
3389 printf("*** %x exception occurred\n", fault_except);
3390 }
3391 catch_memory_errors = 0;
3392 }
3393
3394 /* Input scanning routines */
3395 int
skipbl(void)3396 skipbl(void)
3397 {
3398 int c;
3399
3400 if( termch != 0 ){
3401 c = termch;
3402 termch = 0;
3403 } else
3404 c = inchar();
3405 while( c == ' ' || c == '\t' )
3406 c = inchar();
3407 return c;
3408 }
3409
3410 #define N_PTREGS 44
3411 static const char *regnames[N_PTREGS] = {
3412 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
3413 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
3414 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
3415 "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
3416 "pc", "msr", "or3", "ctr", "lr", "xer", "ccr",
3417 #ifdef CONFIG_PPC64
3418 "softe",
3419 #else
3420 "mq",
3421 #endif
3422 "trap", "dar", "dsisr", "res"
3423 };
3424
3425 int
scanhex(unsigned long * vp)3426 scanhex(unsigned long *vp)
3427 {
3428 int c, d;
3429 unsigned long v;
3430
3431 c = skipbl();
3432 if (c == '%') {
3433 /* parse register name */
3434 char regname[8];
3435 int i;
3436
3437 for (i = 0; i < sizeof(regname) - 1; ++i) {
3438 c = inchar();
3439 if (!isalnum(c)) {
3440 termch = c;
3441 break;
3442 }
3443 regname[i] = c;
3444 }
3445 regname[i] = 0;
3446 i = match_string(regnames, N_PTREGS, regname);
3447 if (i < 0) {
3448 printf("invalid register name '%%%s'\n", regname);
3449 return 0;
3450 }
3451 if (xmon_regs == NULL) {
3452 printf("regs not available\n");
3453 return 0;
3454 }
3455 *vp = ((unsigned long *)xmon_regs)[i];
3456 return 1;
3457 }
3458
3459 /* skip leading "0x" if any */
3460
3461 if (c == '0') {
3462 c = inchar();
3463 if (c == 'x') {
3464 c = inchar();
3465 } else {
3466 d = hexdigit(c);
3467 if (d == EOF) {
3468 termch = c;
3469 *vp = 0;
3470 return 1;
3471 }
3472 }
3473 } else if (c == '$') {
3474 int i;
3475 for (i=0; i<63; i++) {
3476 c = inchar();
3477 if (isspace(c) || c == '\0') {
3478 termch = c;
3479 break;
3480 }
3481 tmpstr[i] = c;
3482 }
3483 tmpstr[i++] = 0;
3484 *vp = 0;
3485 if (setjmp(bus_error_jmp) == 0) {
3486 catch_memory_errors = 1;
3487 sync();
3488 *vp = kallsyms_lookup_name(tmpstr);
3489 sync();
3490 }
3491 catch_memory_errors = 0;
3492 if (!(*vp)) {
3493 printf("unknown symbol '%s'\n", tmpstr);
3494 return 0;
3495 }
3496 return 1;
3497 }
3498
3499 d = hexdigit(c);
3500 if (d == EOF) {
3501 termch = c;
3502 return 0;
3503 }
3504 v = 0;
3505 do {
3506 v = (v << 4) + d;
3507 c = inchar();
3508 d = hexdigit(c);
3509 } while (d != EOF);
3510 termch = c;
3511 *vp = v;
3512 return 1;
3513 }
3514
3515 static void
scannl(void)3516 scannl(void)
3517 {
3518 int c;
3519
3520 c = termch;
3521 termch = 0;
3522 while( c != '\n' )
3523 c = inchar();
3524 }
3525
hexdigit(int c)3526 static int hexdigit(int c)
3527 {
3528 if( '0' <= c && c <= '9' )
3529 return c - '0';
3530 if( 'A' <= c && c <= 'F' )
3531 return c - ('A' - 10);
3532 if( 'a' <= c && c <= 'f' )
3533 return c - ('a' - 10);
3534 return EOF;
3535 }
3536
3537 void
getstring(char * s,int size)3538 getstring(char *s, int size)
3539 {
3540 int c;
3541
3542 c = skipbl();
3543 if (c == '\n') {
3544 *s = 0;
3545 return;
3546 }
3547
3548 do {
3549 if( size > 1 ){
3550 *s++ = c;
3551 --size;
3552 }
3553 c = inchar();
3554 } while( c != ' ' && c != '\t' && c != '\n' );
3555 termch = c;
3556 *s = 0;
3557 }
3558
3559 static char line[256];
3560 static char *lineptr;
3561
3562 static void
flush_input(void)3563 flush_input(void)
3564 {
3565 lineptr = NULL;
3566 }
3567
3568 static int
inchar(void)3569 inchar(void)
3570 {
3571 if (lineptr == NULL || *lineptr == 0) {
3572 if (xmon_gets(line, sizeof(line)) == NULL) {
3573 lineptr = NULL;
3574 return EOF;
3575 }
3576 lineptr = line;
3577 }
3578 return *lineptr++;
3579 }
3580
3581 static void
take_input(char * str)3582 take_input(char *str)
3583 {
3584 lineptr = str;
3585 }
3586
3587
3588 static void
symbol_lookup(void)3589 symbol_lookup(void)
3590 {
3591 int type = inchar();
3592 unsigned long addr, cpu;
3593 void __percpu *ptr = NULL;
3594 static char tmp[64];
3595
3596 switch (type) {
3597 case 'a':
3598 if (scanhex(&addr))
3599 xmon_print_symbol(addr, ": ", "\n");
3600 termch = 0;
3601 break;
3602 case 's':
3603 getstring(tmp, 64);
3604 if (setjmp(bus_error_jmp) == 0) {
3605 catch_memory_errors = 1;
3606 sync();
3607 addr = kallsyms_lookup_name(tmp);
3608 if (addr)
3609 printf("%s: %lx\n", tmp, addr);
3610 else
3611 printf("Symbol '%s' not found.\n", tmp);
3612 sync();
3613 }
3614 catch_memory_errors = 0;
3615 termch = 0;
3616 break;
3617 case 'p':
3618 getstring(tmp, 64);
3619 if (setjmp(bus_error_jmp) == 0) {
3620 catch_memory_errors = 1;
3621 sync();
3622 ptr = (void __percpu *)kallsyms_lookup_name(tmp);
3623 sync();
3624 }
3625
3626 if (ptr &&
3627 ptr >= (void __percpu *)__per_cpu_start &&
3628 ptr < (void __percpu *)__per_cpu_end)
3629 {
3630 if (scanhex(&cpu) && cpu < num_possible_cpus()) {
3631 addr = (unsigned long)per_cpu_ptr(ptr, cpu);
3632 } else {
3633 cpu = raw_smp_processor_id();
3634 addr = (unsigned long)this_cpu_ptr(ptr);
3635 }
3636
3637 printf("%s for cpu 0x%lx: %lx\n", tmp, cpu, addr);
3638 } else {
3639 printf("Percpu symbol '%s' not found.\n", tmp);
3640 }
3641
3642 catch_memory_errors = 0;
3643 termch = 0;
3644 break;
3645 }
3646 }
3647
3648
3649 /* Print an address in numeric and symbolic form (if possible) */
xmon_print_symbol(unsigned long address,const char * mid,const char * after)3650 static void xmon_print_symbol(unsigned long address, const char *mid,
3651 const char *after)
3652 {
3653 char *modname;
3654 const char *name = NULL;
3655 unsigned long offset, size;
3656
3657 printf(REG, address);
3658 if (setjmp(bus_error_jmp) == 0) {
3659 catch_memory_errors = 1;
3660 sync();
3661 name = kallsyms_lookup(address, &size, &offset, &modname,
3662 tmpstr);
3663 sync();
3664 /* wait a little while to see if we get a machine check */
3665 __delay(200);
3666 }
3667
3668 catch_memory_errors = 0;
3669
3670 if (name) {
3671 printf("%s%s+%#lx/%#lx", mid, name, offset, size);
3672 if (modname)
3673 printf(" [%s]", modname);
3674 }
3675 printf("%s", after);
3676 }
3677
3678 #ifdef CONFIG_PPC_BOOK3S_64
dump_segments(void)3679 void dump_segments(void)
3680 {
3681 int i;
3682 unsigned long esid,vsid;
3683 unsigned long llp;
3684
3685 printf("SLB contents of cpu 0x%x\n", smp_processor_id());
3686
3687 for (i = 0; i < mmu_slb_size; i++) {
3688 asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i));
3689 asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i));
3690
3691 if (!esid && !vsid)
3692 continue;
3693
3694 printf("%02d %016lx %016lx", i, esid, vsid);
3695
3696 if (!(esid & SLB_ESID_V)) {
3697 printf("\n");
3698 continue;
3699 }
3700
3701 llp = vsid & SLB_VSID_LLP;
3702 if (vsid & SLB_VSID_B_1T) {
3703 printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n",
3704 GET_ESID_1T(esid),
3705 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
3706 llp);
3707 } else {
3708 printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n",
3709 GET_ESID(esid),
3710 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
3711 llp);
3712 }
3713 }
3714 }
3715 #endif
3716
3717 #ifdef CONFIG_PPC_BOOK3S_32
dump_segments(void)3718 void dump_segments(void)
3719 {
3720 int i;
3721
3722 printf("sr0-15 =");
3723 for (i = 0; i < 16; ++i)
3724 printf(" %x", mfsrin(i << 28));
3725 printf("\n");
3726 }
3727 #endif
3728
3729 #ifdef CONFIG_44x
dump_tlb_44x(void)3730 static void dump_tlb_44x(void)
3731 {
3732 int i;
3733
3734 for (i = 0; i < PPC44x_TLB_SIZE; i++) {
3735 unsigned long w0,w1,w2;
3736 asm volatile("tlbre %0,%1,0" : "=r" (w0) : "r" (i));
3737 asm volatile("tlbre %0,%1,1" : "=r" (w1) : "r" (i));
3738 asm volatile("tlbre %0,%1,2" : "=r" (w2) : "r" (i));
3739 printf("[%02x] %08lx %08lx %08lx ", i, w0, w1, w2);
3740 if (w0 & PPC44x_TLB_VALID) {
3741 printf("V %08lx -> %01lx%08lx %c%c%c%c%c",
3742 w0 & PPC44x_TLB_EPN_MASK,
3743 w1 & PPC44x_TLB_ERPN_MASK,
3744 w1 & PPC44x_TLB_RPN_MASK,
3745 (w2 & PPC44x_TLB_W) ? 'W' : 'w',
3746 (w2 & PPC44x_TLB_I) ? 'I' : 'i',
3747 (w2 & PPC44x_TLB_M) ? 'M' : 'm',
3748 (w2 & PPC44x_TLB_G) ? 'G' : 'g',
3749 (w2 & PPC44x_TLB_E) ? 'E' : 'e');
3750 }
3751 printf("\n");
3752 }
3753 }
3754 #endif /* CONFIG_44x */
3755
3756 #ifdef CONFIG_PPC_BOOK3E
dump_tlb_book3e(void)3757 static void dump_tlb_book3e(void)
3758 {
3759 u32 mmucfg, pidmask, lpidmask;
3760 u64 ramask;
3761 int i, tlb, ntlbs, pidsz, lpidsz, rasz, lrat = 0;
3762 int mmu_version;
3763 static const char *pgsz_names[] = {
3764 " 1K",
3765 " 2K",
3766 " 4K",
3767 " 8K",
3768 " 16K",
3769 " 32K",
3770 " 64K",
3771 "128K",
3772 "256K",
3773 "512K",
3774 " 1M",
3775 " 2M",
3776 " 4M",
3777 " 8M",
3778 " 16M",
3779 " 32M",
3780 " 64M",
3781 "128M",
3782 "256M",
3783 "512M",
3784 " 1G",
3785 " 2G",
3786 " 4G",
3787 " 8G",
3788 " 16G",
3789 " 32G",
3790 " 64G",
3791 "128G",
3792 "256G",
3793 "512G",
3794 " 1T",
3795 " 2T",
3796 };
3797
3798 /* Gather some infos about the MMU */
3799 mmucfg = mfspr(SPRN_MMUCFG);
3800 mmu_version = (mmucfg & 3) + 1;
3801 ntlbs = ((mmucfg >> 2) & 3) + 1;
3802 pidsz = ((mmucfg >> 6) & 0x1f) + 1;
3803 lpidsz = (mmucfg >> 24) & 0xf;
3804 rasz = (mmucfg >> 16) & 0x7f;
3805 if ((mmu_version > 1) && (mmucfg & 0x10000))
3806 lrat = 1;
3807 printf("Book3E MMU MAV=%d.0,%d TLBs,%d-bit PID,%d-bit LPID,%d-bit RA\n",
3808 mmu_version, ntlbs, pidsz, lpidsz, rasz);
3809 pidmask = (1ul << pidsz) - 1;
3810 lpidmask = (1ul << lpidsz) - 1;
3811 ramask = (1ull << rasz) - 1;
3812
3813 for (tlb = 0; tlb < ntlbs; tlb++) {
3814 u32 tlbcfg;
3815 int nent, assoc, new_cc = 1;
3816 printf("TLB %d:\n------\n", tlb);
3817 switch(tlb) {
3818 case 0:
3819 tlbcfg = mfspr(SPRN_TLB0CFG);
3820 break;
3821 case 1:
3822 tlbcfg = mfspr(SPRN_TLB1CFG);
3823 break;
3824 case 2:
3825 tlbcfg = mfspr(SPRN_TLB2CFG);
3826 break;
3827 case 3:
3828 tlbcfg = mfspr(SPRN_TLB3CFG);
3829 break;
3830 default:
3831 printf("Unsupported TLB number !\n");
3832 continue;
3833 }
3834 nent = tlbcfg & 0xfff;
3835 assoc = (tlbcfg >> 24) & 0xff;
3836 for (i = 0; i < nent; i++) {
3837 u32 mas0 = MAS0_TLBSEL(tlb);
3838 u32 mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K);
3839 u64 mas2 = 0;
3840 u64 mas7_mas3;
3841 int esel = i, cc = i;
3842
3843 if (assoc != 0) {
3844 cc = i / assoc;
3845 esel = i % assoc;
3846 mas2 = cc * 0x1000;
3847 }
3848
3849 mas0 |= MAS0_ESEL(esel);
3850 mtspr(SPRN_MAS0, mas0);
3851 mtspr(SPRN_MAS1, mas1);
3852 mtspr(SPRN_MAS2, mas2);
3853 asm volatile("tlbre 0,0,0" : : : "memory");
3854 mas1 = mfspr(SPRN_MAS1);
3855 mas2 = mfspr(SPRN_MAS2);
3856 mas7_mas3 = mfspr(SPRN_MAS7_MAS3);
3857 if (assoc && (i % assoc) == 0)
3858 new_cc = 1;
3859 if (!(mas1 & MAS1_VALID))
3860 continue;
3861 if (assoc == 0)
3862 printf("%04x- ", i);
3863 else if (new_cc)
3864 printf("%04x-%c", cc, 'A' + esel);
3865 else
3866 printf(" |%c", 'A' + esel);
3867 new_cc = 0;
3868 printf(" %016llx %04x %s %c%c AS%c",
3869 mas2 & ~0x3ffull,
3870 (mas1 >> 16) & 0x3fff,
3871 pgsz_names[(mas1 >> 7) & 0x1f],
3872 mas1 & MAS1_IND ? 'I' : ' ',
3873 mas1 & MAS1_IPROT ? 'P' : ' ',
3874 mas1 & MAS1_TS ? '1' : '0');
3875 printf(" %c%c%c%c%c%c%c",
3876 mas2 & MAS2_X0 ? 'a' : ' ',
3877 mas2 & MAS2_X1 ? 'v' : ' ',
3878 mas2 & MAS2_W ? 'w' : ' ',
3879 mas2 & MAS2_I ? 'i' : ' ',
3880 mas2 & MAS2_M ? 'm' : ' ',
3881 mas2 & MAS2_G ? 'g' : ' ',
3882 mas2 & MAS2_E ? 'e' : ' ');
3883 printf(" %016llx", mas7_mas3 & ramask & ~0x7ffull);
3884 if (mas1 & MAS1_IND)
3885 printf(" %s\n",
3886 pgsz_names[(mas7_mas3 >> 1) & 0x1f]);
3887 else
3888 printf(" U%c%c%c S%c%c%c\n",
3889 mas7_mas3 & MAS3_UX ? 'x' : ' ',
3890 mas7_mas3 & MAS3_UW ? 'w' : ' ',
3891 mas7_mas3 & MAS3_UR ? 'r' : ' ',
3892 mas7_mas3 & MAS3_SX ? 'x' : ' ',
3893 mas7_mas3 & MAS3_SW ? 'w' : ' ',
3894 mas7_mas3 & MAS3_SR ? 'r' : ' ');
3895 }
3896 }
3897 }
3898 #endif /* CONFIG_PPC_BOOK3E */
3899
xmon_init(int enable)3900 static void xmon_init(int enable)
3901 {
3902 if (enable) {
3903 __debugger = xmon;
3904 __debugger_ipi = xmon_ipi;
3905 __debugger_bpt = xmon_bpt;
3906 __debugger_sstep = xmon_sstep;
3907 __debugger_iabr_match = xmon_iabr_match;
3908 __debugger_break_match = xmon_break_match;
3909 __debugger_fault_handler = xmon_fault_handler;
3910
3911 #ifdef CONFIG_PPC_PSERIES
3912 /*
3913 * Get the token here to avoid trying to get a lock
3914 * during the crash, causing a deadlock.
3915 */
3916 set_indicator_token = rtas_token("set-indicator");
3917 #endif
3918 } else {
3919 __debugger = NULL;
3920 __debugger_ipi = NULL;
3921 __debugger_bpt = NULL;
3922 __debugger_sstep = NULL;
3923 __debugger_iabr_match = NULL;
3924 __debugger_break_match = NULL;
3925 __debugger_fault_handler = NULL;
3926 }
3927 }
3928
3929 #ifdef CONFIG_MAGIC_SYSRQ
sysrq_handle_xmon(int key)3930 static void sysrq_handle_xmon(int key)
3931 {
3932 if (xmon_is_locked_down()) {
3933 clear_all_bpt();
3934 xmon_init(0);
3935 return;
3936 }
3937 /* ensure xmon is enabled */
3938 xmon_init(1);
3939 debugger(get_irq_regs());
3940 if (!xmon_on)
3941 xmon_init(0);
3942 }
3943
3944 static const struct sysrq_key_op sysrq_xmon_op = {
3945 .handler = sysrq_handle_xmon,
3946 .help_msg = "xmon(x)",
3947 .action_msg = "Entering xmon",
3948 };
3949
setup_xmon_sysrq(void)3950 static int __init setup_xmon_sysrq(void)
3951 {
3952 register_sysrq_key('x', &sysrq_xmon_op);
3953 return 0;
3954 }
3955 device_initcall(setup_xmon_sysrq);
3956 #endif /* CONFIG_MAGIC_SYSRQ */
3957
clear_all_bpt(void)3958 static void clear_all_bpt(void)
3959 {
3960 int i;
3961
3962 /* clear/unpatch all breakpoints */
3963 remove_bpts();
3964 remove_cpu_bpts();
3965
3966 /* Disable all breakpoints */
3967 for (i = 0; i < NBPTS; ++i)
3968 bpts[i].enabled = 0;
3969
3970 /* Clear any data or iabr breakpoints */
3971 iabr = NULL;
3972 for (i = 0; i < nr_wp_slots(); i++)
3973 dabr[i].enabled = 0;
3974 }
3975
3976 #ifdef CONFIG_DEBUG_FS
xmon_dbgfs_set(void * data,u64 val)3977 static int xmon_dbgfs_set(void *data, u64 val)
3978 {
3979 xmon_on = !!val;
3980 xmon_init(xmon_on);
3981
3982 /* make sure all breakpoints removed when disabling */
3983 if (!xmon_on) {
3984 clear_all_bpt();
3985 get_output_lock();
3986 printf("xmon: All breakpoints cleared\n");
3987 release_output_lock();
3988 }
3989
3990 return 0;
3991 }
3992
xmon_dbgfs_get(void * data,u64 * val)3993 static int xmon_dbgfs_get(void *data, u64 *val)
3994 {
3995 *val = xmon_on;
3996 return 0;
3997 }
3998
3999 DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get,
4000 xmon_dbgfs_set, "%llu\n");
4001
setup_xmon_dbgfs(void)4002 static int __init setup_xmon_dbgfs(void)
4003 {
4004 debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL,
4005 &xmon_dbgfs_ops);
4006 return 0;
4007 }
4008 device_initcall(setup_xmon_dbgfs);
4009 #endif /* CONFIG_DEBUG_FS */
4010
4011 static int xmon_early __initdata;
4012
early_parse_xmon(char * p)4013 static int __init early_parse_xmon(char *p)
4014 {
4015 if (xmon_is_locked_down()) {
4016 xmon_init(0);
4017 xmon_early = 0;
4018 xmon_on = 0;
4019 } else if (!p || strncmp(p, "early", 5) == 0) {
4020 /* just "xmon" is equivalent to "xmon=early" */
4021 xmon_init(1);
4022 xmon_early = 1;
4023 xmon_on = 1;
4024 } else if (strncmp(p, "on", 2) == 0) {
4025 xmon_init(1);
4026 xmon_on = 1;
4027 } else if (strncmp(p, "rw", 2) == 0) {
4028 xmon_init(1);
4029 xmon_on = 1;
4030 xmon_is_ro = false;
4031 } else if (strncmp(p, "ro", 2) == 0) {
4032 xmon_init(1);
4033 xmon_on = 1;
4034 xmon_is_ro = true;
4035 } else if (strncmp(p, "off", 3) == 0)
4036 xmon_on = 0;
4037 else
4038 return 1;
4039
4040 return 0;
4041 }
4042 early_param("xmon", early_parse_xmon);
4043
xmon_setup(void)4044 void __init xmon_setup(void)
4045 {
4046 if (xmon_on)
4047 xmon_init(1);
4048 if (xmon_early)
4049 debugger(NULL);
4050 }
4051
4052 #ifdef CONFIG_SPU_BASE
4053
4054 struct spu_info {
4055 struct spu *spu;
4056 u64 saved_mfc_sr1_RW;
4057 u32 saved_spu_runcntl_RW;
4058 unsigned long dump_addr;
4059 u8 stopped_ok;
4060 };
4061
4062 #define XMON_NUM_SPUS 16 /* Enough for current hardware */
4063
4064 static struct spu_info spu_info[XMON_NUM_SPUS];
4065
xmon_register_spus(struct list_head * list)4066 void xmon_register_spus(struct list_head *list)
4067 {
4068 struct spu *spu;
4069
4070 list_for_each_entry(spu, list, full_list) {
4071 if (spu->number >= XMON_NUM_SPUS) {
4072 WARN_ON(1);
4073 continue;
4074 }
4075
4076 spu_info[spu->number].spu = spu;
4077 spu_info[spu->number].stopped_ok = 0;
4078 spu_info[spu->number].dump_addr = (unsigned long)
4079 spu_info[spu->number].spu->local_store;
4080 }
4081 }
4082
stop_spus(void)4083 static void stop_spus(void)
4084 {
4085 struct spu *spu;
4086 int i;
4087 u64 tmp;
4088
4089 for (i = 0; i < XMON_NUM_SPUS; i++) {
4090 if (!spu_info[i].spu)
4091 continue;
4092
4093 if (setjmp(bus_error_jmp) == 0) {
4094 catch_memory_errors = 1;
4095 sync();
4096
4097 spu = spu_info[i].spu;
4098
4099 spu_info[i].saved_spu_runcntl_RW =
4100 in_be32(&spu->problem->spu_runcntl_RW);
4101
4102 tmp = spu_mfc_sr1_get(spu);
4103 spu_info[i].saved_mfc_sr1_RW = tmp;
4104
4105 tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
4106 spu_mfc_sr1_set(spu, tmp);
4107
4108 sync();
4109 __delay(200);
4110
4111 spu_info[i].stopped_ok = 1;
4112
4113 printf("Stopped spu %.2d (was %s)\n", i,
4114 spu_info[i].saved_spu_runcntl_RW ?
4115 "running" : "stopped");
4116 } else {
4117 catch_memory_errors = 0;
4118 printf("*** Error stopping spu %.2d\n", i);
4119 }
4120 catch_memory_errors = 0;
4121 }
4122 }
4123
restart_spus(void)4124 static void restart_spus(void)
4125 {
4126 struct spu *spu;
4127 int i;
4128
4129 for (i = 0; i < XMON_NUM_SPUS; i++) {
4130 if (!spu_info[i].spu)
4131 continue;
4132
4133 if (!spu_info[i].stopped_ok) {
4134 printf("*** Error, spu %d was not successfully stopped"
4135 ", not restarting\n", i);
4136 continue;
4137 }
4138
4139 if (setjmp(bus_error_jmp) == 0) {
4140 catch_memory_errors = 1;
4141 sync();
4142
4143 spu = spu_info[i].spu;
4144 spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW);
4145 out_be32(&spu->problem->spu_runcntl_RW,
4146 spu_info[i].saved_spu_runcntl_RW);
4147
4148 sync();
4149 __delay(200);
4150
4151 printf("Restarted spu %.2d\n", i);
4152 } else {
4153 catch_memory_errors = 0;
4154 printf("*** Error restarting spu %.2d\n", i);
4155 }
4156 catch_memory_errors = 0;
4157 }
4158 }
4159
4160 #define DUMP_WIDTH 23
4161 #define DUMP_VALUE(format, field, value) \
4162 do { \
4163 if (setjmp(bus_error_jmp) == 0) { \
4164 catch_memory_errors = 1; \
4165 sync(); \
4166 printf(" %-*s = "format"\n", DUMP_WIDTH, \
4167 #field, value); \
4168 sync(); \
4169 __delay(200); \
4170 } else { \
4171 catch_memory_errors = 0; \
4172 printf(" %-*s = *** Error reading field.\n", \
4173 DUMP_WIDTH, #field); \
4174 } \
4175 catch_memory_errors = 0; \
4176 } while (0)
4177
4178 #define DUMP_FIELD(obj, format, field) \
4179 DUMP_VALUE(format, field, obj->field)
4180
dump_spu_fields(struct spu * spu)4181 static void dump_spu_fields(struct spu *spu)
4182 {
4183 printf("Dumping spu fields at address %p:\n", spu);
4184
4185 DUMP_FIELD(spu, "0x%x", number);
4186 DUMP_FIELD(spu, "%s", name);
4187 DUMP_FIELD(spu, "0x%lx", local_store_phys);
4188 DUMP_FIELD(spu, "0x%p", local_store);
4189 DUMP_FIELD(spu, "0x%lx", ls_size);
4190 DUMP_FIELD(spu, "0x%x", node);
4191 DUMP_FIELD(spu, "0x%lx", flags);
4192 DUMP_FIELD(spu, "%llu", class_0_pending);
4193 DUMP_FIELD(spu, "0x%llx", class_0_dar);
4194 DUMP_FIELD(spu, "0x%llx", class_1_dar);
4195 DUMP_FIELD(spu, "0x%llx", class_1_dsisr);
4196 DUMP_FIELD(spu, "0x%x", irqs[0]);
4197 DUMP_FIELD(spu, "0x%x", irqs[1]);
4198 DUMP_FIELD(spu, "0x%x", irqs[2]);
4199 DUMP_FIELD(spu, "0x%x", slb_replace);
4200 DUMP_FIELD(spu, "%d", pid);
4201 DUMP_FIELD(spu, "0x%p", mm);
4202 DUMP_FIELD(spu, "0x%p", ctx);
4203 DUMP_FIELD(spu, "0x%p", rq);
4204 DUMP_FIELD(spu, "0x%llx", timestamp);
4205 DUMP_FIELD(spu, "0x%lx", problem_phys);
4206 DUMP_FIELD(spu, "0x%p", problem);
4207 DUMP_VALUE("0x%x", problem->spu_runcntl_RW,
4208 in_be32(&spu->problem->spu_runcntl_RW));
4209 DUMP_VALUE("0x%x", problem->spu_status_R,
4210 in_be32(&spu->problem->spu_status_R));
4211 DUMP_VALUE("0x%x", problem->spu_npc_RW,
4212 in_be32(&spu->problem->spu_npc_RW));
4213 DUMP_FIELD(spu, "0x%p", priv2);
4214 DUMP_FIELD(spu, "0x%p", pdata);
4215 }
4216
4217 int
spu_inst_dump(unsigned long adr,long count,int praddr)4218 spu_inst_dump(unsigned long adr, long count, int praddr)
4219 {
4220 return generic_inst_dump(adr, count, praddr, print_insn_spu);
4221 }
4222
dump_spu_ls(unsigned long num,int subcmd)4223 static void dump_spu_ls(unsigned long num, int subcmd)
4224 {
4225 unsigned long offset, addr, ls_addr;
4226
4227 if (setjmp(bus_error_jmp) == 0) {
4228 catch_memory_errors = 1;
4229 sync();
4230 ls_addr = (unsigned long)spu_info[num].spu->local_store;
4231 sync();
4232 __delay(200);
4233 } else {
4234 catch_memory_errors = 0;
4235 printf("*** Error: accessing spu info for spu %ld\n", num);
4236 return;
4237 }
4238 catch_memory_errors = 0;
4239
4240 if (scanhex(&offset))
4241 addr = ls_addr + offset;
4242 else
4243 addr = spu_info[num].dump_addr;
4244
4245 if (addr >= ls_addr + LS_SIZE) {
4246 printf("*** Error: address outside of local store\n");
4247 return;
4248 }
4249
4250 switch (subcmd) {
4251 case 'i':
4252 addr += spu_inst_dump(addr, 16, 1);
4253 last_cmd = "sdi\n";
4254 break;
4255 default:
4256 prdump(addr, 64);
4257 addr += 64;
4258 last_cmd = "sd\n";
4259 break;
4260 }
4261
4262 spu_info[num].dump_addr = addr;
4263 }
4264
do_spu_cmd(void)4265 static int do_spu_cmd(void)
4266 {
4267 static unsigned long num = 0;
4268 int cmd, subcmd = 0;
4269
4270 cmd = inchar();
4271 switch (cmd) {
4272 case 's':
4273 stop_spus();
4274 break;
4275 case 'r':
4276 restart_spus();
4277 break;
4278 case 'd':
4279 subcmd = inchar();
4280 if (isxdigit(subcmd) || subcmd == '\n')
4281 termch = subcmd;
4282 fallthrough;
4283 case 'f':
4284 scanhex(&num);
4285 if (num >= XMON_NUM_SPUS || !spu_info[num].spu) {
4286 printf("*** Error: invalid spu number\n");
4287 return 0;
4288 }
4289
4290 switch (cmd) {
4291 case 'f':
4292 dump_spu_fields(spu_info[num].spu);
4293 break;
4294 default:
4295 dump_spu_ls(num, subcmd);
4296 break;
4297 }
4298
4299 break;
4300 default:
4301 return -1;
4302 }
4303
4304 return 0;
4305 }
4306 #else /* ! CONFIG_SPU_BASE */
do_spu_cmd(void)4307 static int do_spu_cmd(void)
4308 {
4309 return -1;
4310 }
4311 #endif
4312
