xmon.c 61.7 KB
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/*
 * Routines providing a simple monitor for use on the PowerMac.
 *
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 * Copyright (C) 1996-2005 Paul Mackerras.
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 * Copyright (C) 2001 PPC64 Team, IBM Corp
 * Copyrignt (C) 2006 Michael Ellerman, IBM Corp
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 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/kallsyms.h>
#include <linux/cpumask.h>
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#include <linux/module.h>
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#include <linux/sysrq.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/bug.h>
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#include <asm/ptrace.h>
#include <asm/string.h>
#include <asm/prom.h>
#include <asm/machdep.h>
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#include <asm/xmon.h>
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#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/mmu_context.h>
#include <asm/cputable.h>
#include <asm/rtas.h>
#include <asm/sstep.h>
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#include <asm/irq_regs.h>
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#include <asm/spu.h>
#include <asm/spu_priv1.h>
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#include <asm/firmware.h>
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#include <asm/setjmp.h>
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#ifdef CONFIG_PPC64
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#include <asm/hvcall.h>
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#include <asm/paca.h>
#endif
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#include "nonstdio.h"
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#include "dis-asm.h"
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#define scanhex	xmon_scanhex
#define skipbl	xmon_skipbl

#ifdef CONFIG_SMP
cpumask_t cpus_in_xmon = CPU_MASK_NONE;
static unsigned long xmon_taken = 1;
static int xmon_owner;
static int xmon_gate;
#endif /* CONFIG_SMP */

static unsigned long in_xmon = 0;

static unsigned long adrs;
static int size = 1;
#define MAX_DUMP (128 * 1024)
static unsigned long ndump = 64;
static unsigned long nidump = 16;
static unsigned long ncsum = 4096;
static int termch;
static char tmpstr[128];

static long bus_error_jmp[JMP_BUF_LEN];
static int catch_memory_errors;
static long *xmon_fault_jmp[NR_CPUS];

/* Breakpoint stuff */
struct bpt {
	unsigned long	address;
	unsigned int	instr[2];
	atomic_t	ref_count;
	int		enabled;
	unsigned long	pad;
};

/* Bits in bpt.enabled */
#define BP_IABR_TE	1		/* IABR translation enabled */
#define BP_IABR		2
#define BP_TRAP		8
#define BP_DABR		0x10

#define NBPTS	256
static struct bpt bpts[NBPTS];
static struct bpt dabr;
static struct bpt *iabr;
static unsigned bpinstr = 0x7fe00008;	/* trap */

#define BP_NUM(bp)	((bp) - bpts + 1)

/* Prototypes */
static int cmds(struct pt_regs *);
static int mread(unsigned long, void *, int);
static int mwrite(unsigned long, void *, int);
static int handle_fault(struct pt_regs *);
static void byterev(unsigned char *, int);
static void memex(void);
static int bsesc(void);
static void dump(void);
static void prdump(unsigned long, long);
static int ppc_inst_dump(unsigned long, long, int);
static void backtrace(struct pt_regs *);
static void excprint(struct pt_regs *);
static void prregs(struct pt_regs *);
static void memops(int);
static void memlocate(void);
static void memzcan(void);
static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned);
int skipbl(void);
int scanhex(unsigned long *valp);
static void scannl(void);
static int hexdigit(int);
void getstring(char *, int);
static void flush_input(void);
static int inchar(void);
static void take_input(char *);
static unsigned long read_spr(int);
static void write_spr(int, unsigned long);
static void super_regs(void);
static void remove_bpts(void);
static void insert_bpts(void);
static void remove_cpu_bpts(void);
static void insert_cpu_bpts(void);
static struct bpt *at_breakpoint(unsigned long pc);
static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp);
static int  do_step(struct pt_regs *);
static void bpt_cmds(void);
static void cacheflush(void);
static int  cpu_cmd(void);
static void csum(void);
static void bootcmds(void);
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static void proccall(void);
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void dump_segments(void);
static void symbol_lookup(void);
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static void xmon_show_stack(unsigned long sp, unsigned long lr,
			    unsigned long pc);
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static void xmon_print_symbol(unsigned long address, const char *mid,
			      const char *after);
static const char *getvecname(unsigned long vec);

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static int do_spu_cmd(void);

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#ifdef CONFIG_44x
static void dump_tlb_44x(void);
#endif

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int xmon_no_auto_backtrace;

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extern void xmon_enter(void);
extern void xmon_leave(void);

extern void xmon_save_regs(struct pt_regs *);

#ifdef CONFIG_PPC64
#define REG		"%.16lx"
#define REGS_PER_LINE	4
#define LAST_VOLATILE	13
#else
#define REG		"%.8lx"
#define REGS_PER_LINE	8
#define LAST_VOLATILE	12
#endif
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#define GETWORD(v)	(((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])

#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
			 || ('a' <= (c) && (c) <= 'f') \
			 || ('A' <= (c) && (c) <= 'F'))
#define isalnum(c)	(('0' <= (c) && (c) <= '9') \
			 || ('a' <= (c) && (c) <= 'z') \
			 || ('A' <= (c) && (c) <= 'Z'))
#define isspace(c)	(c == ' ' || c == '\t' || c == 10 || c == 13 || c == 0)

static char *help_string = "\
Commands:\n\
  b	show breakpoints\n\
  bd	set data breakpoint\n\
  bi	set instruction breakpoint\n\
  bc	clear breakpoint\n"
#ifdef CONFIG_SMP
  "\
  c	print cpus stopped in xmon\n\
  c#	try to switch to cpu number h (in hex)\n"
#endif
  "\
  C	checksum\n\
  d	dump bytes\n\
  di	dump instructions\n\
  df	dump float values\n\
  dd	dump double values\n\
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  dr	dump stream of raw bytes\n\
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  e	print exception information\n\
  f	flush cache\n\
  la	lookup symbol+offset of specified address\n\
  ls	lookup address of specified symbol\n\
  m	examine/change memory\n\
  mm	move a block of memory\n\
  ms	set a block of memory\n\
  md	compare two blocks of memory\n\
  ml	locate a block of memory\n\
  mz	zero a block of memory\n\
  mi	show information about memory allocation\n\
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  p 	call a procedure\n\
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  r	print registers\n\
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  s	single step\n"
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#ifdef CONFIG_SPU_BASE
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"  ss	stop execution on all spus\n\
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  sr	restore execution on stopped spus\n\
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  sf  #	dump spu fields for spu # (in hex)\n\
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  sd  #	dump spu local store for spu # (in hex)\n\
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  sdi #	disassemble spu local store for spu # (in hex)\n"
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#endif
"  S	print special registers\n\
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  t	print backtrace\n\
  x	exit monitor and recover\n\
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  X	exit monitor and dont recover\n"
#ifdef CONFIG_PPC64
"  u	dump segment table or SLB\n"
#endif
#ifdef CONFIG_PPC_STD_MMU_32
"  u	dump segment registers\n"
#endif
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#ifdef CONFIG_44x
"  u	dump TLB\n"
#endif
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"  ?	help\n"
"  zr	reboot\n\
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  zh	halt\n"
;

static struct pt_regs *xmon_regs;

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static inline void sync(void)
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{
	asm volatile("sync; isync");
}

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static inline void store_inst(void *p)
{
	asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p));
}

static inline void cflush(void *p)
{
	asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p));
}

static inline void cinval(void *p)
{
	asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p));
}
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/*
 * Disable surveillance (the service processor watchdog function)
 * while we are in xmon.
 * XXX we should re-enable it when we leave. :)
 */
#define SURVEILLANCE_TOKEN	9000

static inline void disable_surveillance(void)
{
#ifdef CONFIG_PPC_PSERIES
	/* Since this can't be a module, args should end up below 4GB. */
	static struct rtas_args args;

	/*
	 * At this point we have got all the cpus we can into
	 * xmon, so there is hopefully no other cpu calling RTAS
	 * at the moment, even though we don't take rtas.lock.
	 * If we did try to take rtas.lock there would be a
	 * real possibility of deadlock.
	 */
	args.token = rtas_token("set-indicator");
	if (args.token == RTAS_UNKNOWN_SERVICE)
		return;
	args.nargs = 3;
	args.nret = 1;
	args.rets = &args.args[3];
	args.args[0] = SURVEILLANCE_TOKEN;
	args.args[1] = 0;
	args.args[2] = 0;
	enter_rtas(__pa(&args));
#endif /* CONFIG_PPC_PSERIES */
}

#ifdef CONFIG_SMP
static int xmon_speaker;

static void get_output_lock(void)
{
	int me = smp_processor_id() + 0x100;
	int last_speaker = 0, prev;
	long timeout;

	if (xmon_speaker == me)
		return;
	for (;;) {
		if (xmon_speaker == 0) {
			last_speaker = cmpxchg(&xmon_speaker, 0, me);
			if (last_speaker == 0)
				return;
		}
		timeout = 10000000;
		while (xmon_speaker == last_speaker) {
			if (--timeout > 0)
				continue;
			/* hostile takeover */
			prev = cmpxchg(&xmon_speaker, last_speaker, me);
			if (prev == last_speaker)
				return;
			break;
		}
	}
}

static void release_output_lock(void)
{
	xmon_speaker = 0;
}
#endif

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static int xmon_core(struct pt_regs *regs, int fromipi)
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{
	int cmd = 0;
	struct bpt *bp;
	long recurse_jmp[JMP_BUF_LEN];
	unsigned long offset;
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	unsigned long flags;
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#ifdef CONFIG_SMP
	int cpu;
	int secondary;
	unsigned long timeout;
#endif

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	local_irq_save(flags);
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	bp = in_breakpoint_table(regs->nip, &offset);
	if (bp != NULL) {
		regs->nip = bp->address + offset;
		atomic_dec(&bp->ref_count);
	}

	remove_cpu_bpts();

#ifdef CONFIG_SMP
	cpu = smp_processor_id();
	if (cpu_isset(cpu, cpus_in_xmon)) {
		get_output_lock();
		excprint(regs);
		printf("cpu 0x%x: Exception %lx %s in xmon, "
		       "returning to main loop\n",
		       cpu, regs->trap, getvecname(TRAP(regs)));
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		release_output_lock();
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		longjmp(xmon_fault_jmp[cpu], 1);
	}

	if (setjmp(recurse_jmp) != 0) {
		if (!in_xmon || !xmon_gate) {
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			get_output_lock();
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			printf("xmon: WARNING: bad recursive fault "
			       "on cpu 0x%x\n", cpu);
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			release_output_lock();
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			goto waiting;
		}
		secondary = !(xmon_taken && cpu == xmon_owner);
		goto cmdloop;
	}

	xmon_fault_jmp[cpu] = recurse_jmp;
	cpu_set(cpu, cpus_in_xmon);

	bp = NULL;
	if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF))
		bp = at_breakpoint(regs->nip);
	if (bp || (regs->msr & MSR_RI) == 0)
		fromipi = 0;

	if (!fromipi) {
		get_output_lock();
		excprint(regs);
		if (bp) {
			printf("cpu 0x%x stopped at breakpoint 0x%x (",
			       cpu, BP_NUM(bp));
			xmon_print_symbol(regs->nip, " ", ")\n");
		}
		if ((regs->msr & MSR_RI) == 0)
			printf("WARNING: exception is not recoverable, "
			       "can't continue\n");
		release_output_lock();
	}

 waiting:
	secondary = 1;
	while (secondary && !xmon_gate) {
		if (in_xmon == 0) {
			if (fromipi)
				goto leave;
			secondary = test_and_set_bit(0, &in_xmon);
		}
		barrier();
	}

	if (!secondary && !xmon_gate) {
		/* we are the first cpu to come in */
		/* interrupt other cpu(s) */
		int ncpus = num_online_cpus();

		xmon_owner = cpu;
		mb();
		if (ncpus > 1) {
			smp_send_debugger_break(MSG_ALL_BUT_SELF);
			/* wait for other cpus to come in */
			for (timeout = 100000000; timeout != 0; --timeout) {
				if (cpus_weight(cpus_in_xmon) >= ncpus)
					break;
				barrier();
			}
		}
		remove_bpts();
		disable_surveillance();
		/* for breakpoint or single step, print the current instr. */
		if (bp || TRAP(regs) == 0xd00)
			ppc_inst_dump(regs->nip, 1, 0);
		printf("enter ? for help\n");
		mb();
		xmon_gate = 1;
		barrier();
	}

 cmdloop:
	while (in_xmon) {
		if (secondary) {
			if (cpu == xmon_owner) {
				if (!test_and_set_bit(0, &xmon_taken)) {
					secondary = 0;
					continue;
				}
				/* missed it */
				while (cpu == xmon_owner)
					barrier();
			}
			barrier();
		} else {
			cmd = cmds(regs);
			if (cmd != 0) {
				/* exiting xmon */
				insert_bpts();
				xmon_gate = 0;
				wmb();
				in_xmon = 0;
				break;
			}
			/* have switched to some other cpu */
			secondary = 1;
		}
	}
 leave:
	cpu_clear(cpu, cpus_in_xmon);
	xmon_fault_jmp[cpu] = NULL;
#else
	/* UP is simple... */
	if (in_xmon) {
		printf("Exception %lx %s in xmon, returning to main loop\n",
		       regs->trap, getvecname(TRAP(regs)));
		longjmp(xmon_fault_jmp[0], 1);
	}
	if (setjmp(recurse_jmp) == 0) {
		xmon_fault_jmp[0] = recurse_jmp;
		in_xmon = 1;

		excprint(regs);
		bp = at_breakpoint(regs->nip);
		if (bp) {
			printf("Stopped at breakpoint %x (", BP_NUM(bp));
			xmon_print_symbol(regs->nip, " ", ")\n");
		}
		if ((regs->msr & MSR_RI) == 0)
			printf("WARNING: exception is not recoverable, "
			       "can't continue\n");
		remove_bpts();
		disable_surveillance();
		/* for breakpoint or single step, print the current instr. */
		if (bp || TRAP(regs) == 0xd00)
			ppc_inst_dump(regs->nip, 1, 0);
		printf("enter ? for help\n");
	}

	cmd = cmds(regs);

	insert_bpts();
	in_xmon = 0;
#endif

	if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF)) {
		bp = at_breakpoint(regs->nip);
		if (bp != NULL) {
			int stepped = emulate_step(regs, bp->instr[0]);
			if (stepped == 0) {
				regs->nip = (unsigned long) &bp->instr[0];
				atomic_inc(&bp->ref_count);
			} else if (stepped < 0) {
				printf("Couldn't single-step %s instruction\n",
				    (IS_RFID(bp->instr[0])? "rfid": "mtmsrd"));
			}
		}
	}

	insert_cpu_bpts();

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	local_irq_restore(flags);
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	return cmd != 'X' && cmd != EOF;
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}

int xmon(struct pt_regs *excp)
{
	struct pt_regs regs;

	if (excp == NULL) {
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		xmon_save_regs(&regs);
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		excp = &regs;
	}
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	return xmon_core(excp, 0);
}
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EXPORT_SYMBOL(xmon);

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irqreturn_t xmon_irq(int irq, void *d)
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{
	unsigned long flags;
	local_irq_save(flags);
	printf("Keyboard interrupt\n");
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	xmon(get_irq_regs());
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	local_irq_restore(flags);
	return IRQ_HANDLED;
}
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static int xmon_bpt(struct pt_regs *regs)
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{
	struct bpt *bp;
	unsigned long offset;

	if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
		return 0;

	/* Are we at the trap at bp->instr[1] for some bp? */
	bp = in_breakpoint_table(regs->nip, &offset);
	if (bp != NULL && offset == 4) {
		regs->nip = bp->address + 4;
		atomic_dec(&bp->ref_count);
		return 1;
	}

	/* Are we at a breakpoint? */
	bp = at_breakpoint(regs->nip);
	if (!bp)
		return 0;

	xmon_core(regs, 0);

	return 1;
}

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static int xmon_sstep(struct pt_regs *regs)
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{
	if (user_mode(regs))
		return 0;
	xmon_core(regs, 0);
	return 1;
}

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static int xmon_dabr_match(struct pt_regs *regs)
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{
	if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
		return 0;
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	if (dabr.enabled == 0)
		return 0;
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	xmon_core(regs, 0);
	return 1;
}

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static int xmon_iabr_match(struct pt_regs *regs)
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{
	if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
		return 0;
	if (iabr == 0)
		return 0;
	xmon_core(regs, 0);
	return 1;
}

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static int xmon_ipi(struct pt_regs *regs)
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{
#ifdef CONFIG_SMP
	if (in_xmon && !cpu_isset(smp_processor_id(), cpus_in_xmon))
		xmon_core(regs, 1);
#endif
	return 0;
}

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static int xmon_fault_handler(struct pt_regs *regs)
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{
	struct bpt *bp;
	unsigned long offset;

	if (in_xmon && catch_memory_errors)
		handle_fault(regs);	/* doesn't return */

	if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF)) {
		bp = in_breakpoint_table(regs->nip, &offset);
		if (bp != NULL) {
			regs->nip = bp->address + offset;
			atomic_dec(&bp->ref_count);
		}
	}

	return 0;
}

static struct bpt *at_breakpoint(unsigned long pc)
{
	int i;
	struct bpt *bp;

	bp = bpts;
	for (i = 0; i < NBPTS; ++i, ++bp)
		if (bp->enabled && pc == bp->address)
			return bp;
	return NULL;
}

static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp)
{
	unsigned long off;

	off = nip - (unsigned long) bpts;
	if (off >= sizeof(bpts))
		return NULL;
	off %= sizeof(struct bpt);
	if (off != offsetof(struct bpt, instr[0])
	    && off != offsetof(struct bpt, instr[1]))
		return NULL;
	*offp = off - offsetof(struct bpt, instr[0]);
	return (struct bpt *) (nip - off);
}

static struct bpt *new_breakpoint(unsigned long a)
{
	struct bpt *bp;

	a &= ~3UL;
	bp = at_breakpoint(a);
	if (bp)
		return bp;

	for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
		if (!bp->enabled && atomic_read(&bp->ref_count) == 0) {
			bp->address = a;
			bp->instr[1] = bpinstr;
			store_inst(&bp->instr[1]);
			return bp;
		}
	}

	printf("Sorry, no free breakpoints.  Please clear one first.\n");
	return NULL;
}

static void insert_bpts(void)
{
	int i;
	struct bpt *bp;

	bp = bpts;
	for (i = 0; i < NBPTS; ++i, ++bp) {
		if ((bp->enabled & (BP_TRAP|BP_IABR)) == 0)
			continue;
		if (mread(bp->address, &bp->instr[0], 4) != 4) {
			printf("Couldn't read instruction at %lx, "
			       "disabling breakpoint there\n", bp->address);
			bp->enabled = 0;
			continue;
		}
		if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) {
			printf("Breakpoint at %lx is on an mtmsrd or rfid "
			       "instruction, disabling it\n", bp->address);
			bp->enabled = 0;
			continue;
		}
		store_inst(&bp->instr[0]);
		if (bp->enabled & BP_IABR)
			continue;
		if (mwrite(bp->address, &bpinstr, 4) != 4) {
			printf("Couldn't write instruction at %lx, "
			       "disabling breakpoint there\n", bp->address);
			bp->enabled &= ~BP_TRAP;
			continue;
		}
		store_inst((void *)bp->address);
	}
}

static void insert_cpu_bpts(void)
{
	if (dabr.enabled)
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		set_dabr(dabr.address | (dabr.enabled & 7));
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	if (iabr && cpu_has_feature(CPU_FTR_IABR))
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		mtspr(SPRN_IABR, iabr->address
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			 | (iabr->enabled & (BP_IABR|BP_IABR_TE)));
}

static void remove_bpts(void)
{
	int i;
	struct bpt *bp;
	unsigned instr;

	bp = bpts;
	for (i = 0; i < NBPTS; ++i, ++bp) {
		if ((bp->enabled & (BP_TRAP|BP_IABR)) != BP_TRAP)
			continue;
		if (mread(bp->address, &instr, 4) == 4
		    && instr == bpinstr
		    && mwrite(bp->address, &bp->instr, 4) != 4)
			printf("Couldn't remove breakpoint at %lx\n",
			       bp->address);
		else
			store_inst((void *)bp->address);
	}
}

static void remove_cpu_bpts(void)
{
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	set_dabr(0);
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	if (cpu_has_feature(CPU_FTR_IABR))
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		mtspr(SPRN_IABR, 0);
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}

/* Command interpreting routine */
static char *last_cmd;

static int
cmds(struct pt_regs *excp)
{
	int cmd = 0;

	last_cmd = NULL;
	xmon_regs = excp;
759 760 761 762 763 764

	if (!xmon_no_auto_backtrace) {
		xmon_no_auto_backtrace = 1;
		xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
	}

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	for(;;) {
#ifdef CONFIG_SMP
		printf("%x:", smp_processor_id());
#endif /* CONFIG_SMP */
		printf("mon> ");
		flush_input();
		termch = 0;
		cmd = skipbl();
		if( cmd == '\n' ) {
			if (last_cmd == NULL)
				continue;
			take_input(last_cmd);
			last_cmd = NULL;
			cmd = inchar();
		}
		switch (cmd) {
		case 'm':
			cmd = inchar();
			switch (cmd) {
			case 'm':
			case 's':
			case 'd':
				memops(cmd);
				break;
			case 'l':
				memlocate();
				break;
			case 'z':
				memzcan();
				break;
			case 'i':
				show_mem();
				break;
			default:
				termch = cmd;
				memex();
			}
			break;
		case 'd':
			dump();
			break;
		case 'l':
			symbol_lookup();
			break;
		case 'r':
			prregs(excp);	/* print regs */
			break;
		case 'e':
			excprint(excp);
			break;
		case 'S':
			super_regs();
			break;
		case 't':
			backtrace(excp);
			break;
		case 'f':
			cacheflush();
			break;
		case 's':
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			if (do_spu_cmd() == 0)
				break;
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			if (do_step(excp))
				return cmd;
			break;
		case 'x':
		case 'X':
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			return cmd;
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		case EOF:
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			printf(" <no input ...>\n");
			mdelay(2000);
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			return cmd;
		case '?':
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			xmon_puts(help_string);
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			break;
		case 'b':
			bpt_cmds();
			break;
		case 'C':
			csum();
			break;
		case 'c':
			if (cpu_cmd())
				return 0;
			break;
		case 'z':
			bootcmds();
			break;
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		case 'p':
			proccall();
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			break;
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#ifdef CONFIG_PPC_STD_MMU
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		case 'u':
			dump_segments();
			break;
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#endif
#ifdef CONFIG_4xx
		case 'u':
			dump_tlb_44x();
			break;
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#endif
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		default:
			printf("Unrecognized command: ");
		        do {
				if (' ' < cmd && cmd <= '~')
					putchar(cmd);
				else
					printf("\\x%x", cmd);
				cmd = inchar();
		        } while (cmd != '\n'); 
			printf(" (type ? for help)\n");
			break;
		}
	}
}

/*
 * Step a single instruction.
 * Some instructions we emulate, others we execute with MSR_SE set.
 */
static int do_step(struct pt_regs *regs)
{
	unsigned int instr;
	int stepped;

	/* check we are in 64-bit kernel mode, translation enabled */
	if ((regs->msr & (MSR_SF|MSR_PR|MSR_IR)) == (MSR_SF|MSR_IR)) {
		if (mread(regs->nip, &instr, 4) == 4) {
			stepped = emulate_step(regs, instr);
			if (stepped < 0) {
				printf("Couldn't single-step %s instruction\n",
				       (IS_RFID(instr)? "rfid": "mtmsrd"));
				return 0;
			}
			if (stepped > 0) {
				regs->trap = 0xd00 | (regs->trap & 1);
				printf("stepped to ");
				xmon_print_symbol(regs->nip, " ", "\n");
				ppc_inst_dump(regs->nip, 1, 0);
				return 0;
			}
		}
	}
	regs->msr |= MSR_SE;
	return 1;
}

static void bootcmds(void)
{
	int cmd;

	cmd = inchar();
	if (cmd == 'r')
		ppc_md.restart(NULL);
	else if (cmd == 'h')
		ppc_md.halt();
	else if (cmd == 'p')
		ppc_md.power_off();
}

static int cpu_cmd(void)
{
#ifdef CONFIG_SMP
	unsigned long cpu;
	int timeout;
	int count;

	if (!scanhex(&cpu)) {
		/* print cpus waiting or in xmon */
		printf("cpus stopped:");
		count = 0;
		for (cpu = 0; cpu < NR_CPUS; ++cpu) {
			if (cpu_isset(cpu, cpus_in_xmon)) {
				if (count == 0)
					printf(" %x", cpu);
				++count;
			} else {
				if (count > 1)
					printf("-%x", cpu - 1);
				count = 0;
			}
		}
		if (count > 1)
			printf("-%x", NR_CPUS - 1);
		printf("\n");
		return 0;
	}
	/* try to switch to cpu specified */
	if (!cpu_isset(cpu, cpus_in_xmon)) {
		printf("cpu 0x%x isn't in xmon\n", cpu);
		return 0;
	}
	xmon_taken = 0;
	mb();
	xmon_owner = cpu;
	timeout = 10000000;
	while (!xmon_taken) {
		if (--timeout == 0) {
			if (test_and_set_bit(0, &xmon_taken))
				break;
			/* take control back */
			mb();
			xmon_owner = smp_processor_id();
			printf("cpu %u didn't take control\n", cpu);
			return 0;
		}
		barrier();
	}
	return 1;
#else
	return 0;
#endif /* CONFIG_SMP */
}

static unsigned short fcstab[256] = {
	0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
	0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
	0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
	0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
	0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
	0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
	0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
	0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
	0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
	0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
	0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
	0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
	0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
	0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
	0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
	0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
	0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
	0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
	0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
	0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

#define FCS(fcs, c)	(((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])

static void
csum(void)
{
	unsigned int i;
	unsigned short fcs;
	unsigned char v;

	if (!scanhex(&adrs))
		return;
	if (!scanhex(&ncsum))
		return;
	fcs = 0xffff;
	for (i = 0; i < ncsum; ++i) {
		if (mread(adrs+i, &v, 1) == 0) {
			printf("csum stopped at %x\n", adrs+i);
			break;
		}
		fcs = FCS(fcs, v);
	}
	printf("%x\n", fcs);
}

/*
 * Check if this is a suitable place to put a breakpoint.
 */
static long check_bp_loc(unsigned long addr)
{
	unsigned int instr;

	addr &= ~3;
1046
	if (!is_kernel_addr(addr)) {
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		printf("Breakpoints may only be placed at kernel addresses\n");
		return 0;
	}
	if (!mread(addr, &instr, sizeof(instr))) {
		printf("Can't read instruction at address %lx\n", addr);
		return 0;
	}
	if (IS_MTMSRD(instr) || IS_RFID(instr)) {
		printf("Breakpoints may not be placed on mtmsrd or rfid "
		       "instructions\n");
		return 0;
	}
	return 1;
}

static char *breakpoint_help_string = 
    "Breakpoint command usage:\n"
    "b                show breakpoints\n"
    "b <addr> [cnt]   set breakpoint at given instr addr\n"
    "bc               clear all breakpoints\n"
    "bc <n/addr>      clear breakpoint number n or at addr\n"
    "bi <addr> [cnt]  set hardware instr breakpoint (POWER3/RS64 only)\n"
    "bd <addr> [cnt]  set hardware data breakpoint\n"
    "";

static void
bpt_cmds(void)
{
	int cmd;
	unsigned long a;
	int mode, i;
	struct bpt *bp;
	const char badaddr[] = "Only kernel addresses are permitted "
		"for breakpoints\n";

	cmd = inchar();
	switch (cmd) {
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	case 'd':	/* bd - hardware data breakpoint */
		mode = 7;
		cmd = inchar();
		if (cmd == 'r')
			mode = 5;
		else if (cmd == 'w')
			mode = 6;
		else
			termch = cmd;
		dabr.address = 0;
		dabr.enabled = 0;
		if (scanhex(&dabr.address)) {
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			if (!is_kernel_addr(dabr.address)) {
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				printf(badaddr);
				break;
			}
			dabr.address &= ~7;
			dabr.enabled = mode | BP_DABR;
		}
		break;

	case 'i':	/* bi - hardware instr breakpoint */
		if (!cpu_has_feature(CPU_FTR_IABR)) {
			printf("Hardware instruction breakpoint "
			       "not supported on this cpu\n");
			break;
		}
		if (iabr) {
			iabr->enabled &= ~(BP_IABR | BP_IABR_TE);
			iabr = NULL;
		}
		if (!scanhex(&a))
			break;
		if (!check_bp_loc(a))
			break;
		bp = new_breakpoint(a);
		if (bp != NULL) {
			bp->enabled |= BP_IABR | BP_IABR_TE;
			iabr = bp;
		}
		break;
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#endif
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	case 'c':
		if (!scanhex(&a)) {
			/* clear all breakpoints */
			for (i = 0; i < NBPTS; ++i)
				bpts[i].enabled = 0;
			iabr = NULL;
			dabr.enabled = 0;
			printf("All breakpoints cleared\n");
			break;
		}

		if (a <= NBPTS && a >= 1) {
			/* assume a breakpoint number */
			bp = &bpts[a-1];	/* bp nums are 1 based */
		} else {
			/* assume a breakpoint address */
			bp = at_breakpoint(a);
			if (bp == 0) {
				printf("No breakpoint at %x\n", a);
				break;
			}
		}

		printf("Cleared breakpoint %x (", BP_NUM(bp));
		xmon_print_symbol(bp->address, " ", ")\n");
		bp->enabled = 0;
		break;

	default:
		termch = cmd;
	        cmd = skipbl();
		if (cmd == '?') {
			printf(breakpoint_help_string);
			break;
		}
		termch = cmd;
		if (!scanhex(&a)) {
			/* print all breakpoints */
			printf("   type            address\n");
			if (dabr.enabled) {
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				printf("   data   "REG"  [", dabr.address);
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				if (dabr.enabled & 1)
					printf("r");
				if (dabr.enabled & 2)
					printf("w");
				printf("]\n");
			}
			for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
				if (!bp->enabled)
					continue;
				printf("%2x %s   ", BP_NUM(bp),
				    (bp->enabled & BP_IABR)? "inst": "trap");
				xmon_print_symbol(bp->address, "  ", "\n");
			}
			break;
		}

		if (!check_bp_loc(a))
			break;
		bp = new_breakpoint(a);
		if (bp != NULL)
			bp->enabled |= BP_TRAP;
		break;
	}
}

/* Very cheap human name for vector lookup. */
static
const char *getvecname(unsigned long vec)
{
	char *ret;

	switch (vec) {
	case 0x100:	ret = "(System Reset)"; break;
	case 0x200:	ret = "(Machine Check)"; break;
	case 0x300:	ret = "(Data Access)"; break;
	case 0x380:	ret = "(Data SLB Access)"; break;
	case 0x400:	ret = "(Instruction Access)"; break;
	case 0x480:	ret = "(Instruction SLB Access)"; break;
	case 0x500:	ret = "(Hardware Interrupt)"; break;
	case 0x600:	ret = "(Alignment)"; break;
	case 0x700:	ret = "(Program Check)"; break;
	case 0x800:	ret = "(FPU Unavailable)"; break;
	case 0x900:	ret = "(Decrementer)"; break;
	case 0xc00:	ret = "(System Call)"; break;
	case 0xd00:	ret = "(Single Step)"; break;
	case 0xf00:	ret = "(Performance Monitor)"; break;
	case 0xf20:	ret = "(Altivec Unavailable)"; break;
	case 0x1300:	ret = "(Instruction Breakpoint)"; break;
	default: ret = "";
	}
	return ret;
}

static void get_function_bounds(unsigned long pc, unsigned long *startp,
				unsigned long *endp)
{
	unsigned long size, offset;
	const char *name;

	*startp = *endp = 0;
	if (pc == 0)
		return;
	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();
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		name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr);
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		if (name != NULL) {
			*startp = pc - offset;
			*endp = pc - offset + size;
		}
		sync();
	}
	catch_memory_errors = 0;
}

static int xmon_depth_to_print = 64;

1246 1247 1248 1249
#define LRSAVE_OFFSET		(STACK_FRAME_LR_SAVE * sizeof(unsigned long))
#define MARKER_OFFSET		(STACK_FRAME_MARKER * sizeof(unsigned long))

#ifdef __powerpc64__
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#define REGS_OFFSET		0x70
#else
#define REGS_OFFSET		16
#endif

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static void xmon_show_stack(unsigned long sp, unsigned long lr,
			    unsigned long pc)
{
	unsigned long ip;
	unsigned long newsp;
	unsigned long marker;
	int count = 0;
	struct pt_regs regs;

	do {
		if (sp < PAGE_OFFSET) {
			if (sp != 0)
				printf("SP (%lx) is in userspace\n", sp);
			break;
		}

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		if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long))
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		    || !mread(sp, &newsp, sizeof(unsigned long))) {
			printf("Couldn't read stack frame at %lx\n", sp);
			break;
		}

		/*
		 * For the first stack frame, try to work out if
		 * LR and/or the saved LR value in the bottommost
		 * stack frame are valid.
		 */
		if ((pc | lr) != 0) {
			unsigned long fnstart, fnend;
			unsigned long nextip;
			int printip = 1;

			get_function_bounds(pc, &fnstart, &fnend);
			nextip = 0;
			if (newsp > sp)
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				mread(newsp + LRSAVE_OFFSET, &nextip,
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				      sizeof(unsigned long));
			if (lr == ip) {
				if (lr < PAGE_OFFSET
				    || (fnstart <= lr && lr < fnend))
					printip = 0;
			} else if (lr == nextip) {
				printip = 0;
			} else if (lr >= PAGE_OFFSET
				   && !(fnstart <= lr && lr < fnend)) {
				printf("[link register   ] ");
				xmon_print_symbol(lr, " ", "\n");
			}
			if (printip) {
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				printf("["REG"] ", sp);
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				xmon_print_symbol(ip, " ", " (unreliable)\n");
			}
			pc = lr = 0;

		} else {
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			printf("["REG"] ", sp);
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			xmon_print_symbol(ip, " ", "\n");
		}

		/* Look for "regshere" marker to see if this is
		   an exception frame. */
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		if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long))
1317
		    && marker == STACK_FRAME_REGS_MARKER) {
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			if (mread(sp + REGS_OFFSET, &regs, sizeof(regs))
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			    != sizeof(regs)) {
				printf("Couldn't read registers at %lx\n",
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				       sp + REGS_OFFSET);
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				break;
			}
                        printf("--- Exception: %lx %s at ", regs.trap,
			       getvecname(TRAP(&regs)));
			pc = regs.nip;
			lr = regs.link;
			xmon_print_symbol(pc, " ", "\n");
		}

		if (newsp == 0)
			break;

		sp = newsp;
	} while (count++ < xmon_depth_to_print);
}

static void backtrace(struct pt_regs *excp)
{
	unsigned long sp;

	if (scanhex(&sp))
		xmon_show_stack(sp, 0, 0);
	else
		xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
	scannl();
}

static void print_bug_trap(struct pt_regs *regs)
{
1351
	const struct bug_entry *bug;
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	unsigned long addr;

	if (regs->msr & MSR_PR)
		return;		/* not in kernel */
	addr = regs->nip;	/* address of trap instruction */
	if (addr < PAGE_OFFSET)
		return;
	bug = find_bug(regs->nip);
	if (bug == NULL)
		return;
1362
	if (is_warning_bug(bug))
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		return;

1365
#ifdef CONFIG_DEBUG_BUGVERBOSE
1366 1367
	printf("kernel BUG at %s:%u!\n",
	       bug->file, bug->line);
1368 1369 1370
#else
	printf("kernel BUG at %p!\n", (void *)bug->bug_addr);
#endif
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}

void excprint(struct pt_regs *fp)
{
	unsigned long trap;

#ifdef CONFIG_SMP
	printf("cpu 0x%x: ", smp_processor_id());
#endif /* CONFIG_SMP */

	trap = TRAP(fp);
	printf("Vector: %lx %s at [%lx]\n", fp->trap, getvecname(trap), fp);
	printf("    pc: ");
	xmon_print_symbol(fp->nip, ": ", "\n");

	printf("    lr: ", fp->link);
	xmon_print_symbol(fp->link, ": ", "\n");

	printf("    sp: %lx\n", fp->gpr[1]);
	printf("   msr: %lx\n", fp->msr);

	if (trap == 0x300 || trap == 0x380 || trap == 0x600) {
		printf("   dar: %lx\n", fp->dar);
		if (trap != 0x380)
			printf(" dsisr: %lx\n", fp->dsisr);
	}

	printf("  current = 0x%lx\n", current);
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#ifdef CONFIG_PPC64
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	printf("  paca    = 0x%lx\n", get_paca());
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#endif
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	if (current) {
		printf("    pid   = %ld, comm = %s\n",
		       current->pid, current->comm);
	}

	if (trap == 0x700)
		print_bug_trap(fp);
}

void prregs(struct pt_regs *fp)
{
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	int n, trap;
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	unsigned long base;
	struct pt_regs regs;

	if (scanhex(&base)) {
		if (setjmp(bus_error_jmp) == 0) {
			catch_memory_errors = 1;
			sync();
			regs = *(struct pt_regs *)base;
			sync();
			__delay(200);
		} else {
			catch_memory_errors = 0;
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			printf("*** Error reading registers from "REG"\n",
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			       base);
			return;
		}
		catch_memory_errors = 0;
		fp = &regs;
	}

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#ifdef CONFIG_PPC64
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	if (FULL_REGS(fp)) {
		for (n = 0; n < 16; ++n)
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			printf("R%.2ld = "REG"   R%.2ld = "REG"\n",
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			       n, fp->gpr[n], n+16, fp->gpr[n+16]);
	} else {
		for (n = 0; n < 7; ++n)
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			printf("R%.2ld = "REG"   R%.2ld = "REG"\n",
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			       n, fp->gpr[n], n+7, fp->gpr[n+7]);
	}
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#else
	for (n = 0; n < 32; ++n) {
		printf("R%.2d = %.8x%s", n, fp->gpr[n],
		       (n & 3) == 3? "\n": "   ");
		if (n == 12 && !FULL_REGS(fp)) {
			printf("\n");
			break;
		}
	}
#endif
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	printf("pc  = ");
	xmon_print_symbol(fp->nip, " ", "\n");
	printf("lr  = ");
	xmon_print_symbol(fp->link, " ", "\n");
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	printf("msr = "REG"   cr  = %.8lx\n", fp->msr, fp->ccr);
	printf("ctr = "REG"   xer = "REG"   trap = %4lx\n",
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	       fp->ctr, fp->xer, fp->trap);
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	trap = TRAP(fp);
	if (trap == 0x300 || trap == 0x380 || trap == 0x600)
		printf("dar = "REG"   dsisr = %.8lx\n", fp->dar, fp->dsisr);
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}

void cacheflush(void)
{
	int cmd;
	unsigned long nflush;

	cmd = inchar();
	if (cmd != 'i')
		termch = cmd;
	scanhex((void *)&adrs);
	if (termch != '\n')
		termch = 0;
	nflush = 1;
	scanhex(&nflush);
	nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES;
	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();

		if (cmd != 'i') {
			for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
				cflush((void *) adrs);
		} else {
			for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
				cinval((void *) adrs);
		}
		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
	}
	catch_memory_errors = 0;
}

unsigned long
read_spr(int n)
{
	unsigned int instrs[2];
	unsigned long (*code)(void);
	unsigned long ret = -1UL;
1504 1505
#ifdef CONFIG_PPC64
	unsigned long opd[3];
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	opd[0] = (unsigned long)instrs;
	opd[1] = 0;
	opd[2] = 0;
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	code = (unsigned long (*)(void)) opd;
#else
	code = (unsigned long (*)(void)) instrs;
#endif

	/* mfspr r3,n; blr */
	instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
	instrs[1] = 0x4e800020;
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	store_inst(instrs);
	store_inst(instrs+1);

	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();

		ret = code();

		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
		n = size;
	}

	return ret;
}

void
write_spr(int n, unsigned long val)
{
	unsigned int instrs[2];
	unsigned long (*code)(unsigned long);
1541
#ifdef CONFIG_PPC64
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	unsigned long opd[3];

	opd[0] = (unsigned long)instrs;
	opd[1] = 0;
	opd[2] = 0;
1547 1548 1549 1550 1551 1552 1553
	code = (unsigned long (*)(unsigned long)) opd;
#else
	code = (unsigned long (*)(unsigned long)) instrs;
#endif

	instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
	instrs[1] = 0x4e800020;
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	store_inst(instrs);
	store_inst(instrs+1);

	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();

		code(val);

		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
		n = size;
	}
}

static unsigned long regno;
extern char exc_prolog;
extern char dec_exc;

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void super_regs(void)
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{
	int cmd;
	unsigned long val;

	cmd = skipbl();
	if (cmd == '\n') {
	        unsigned long sp, toc;
		asm("mr %0,1" : "=r" (sp) :);
		asm("mr %0,2" : "=r" (toc) :);

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		printf("msr  = "REG"  sprg0= "REG"\n",
		       mfmsr(), mfspr(SPRN_SPRG0));
		printf("pvr  = "REG"  sprg1= "REG"\n",
		       mfspr(SPRN_PVR), mfspr(SPRN_SPRG1)); 
		printf("dec  = "REG"  sprg2= "REG"\n",
		       mfspr(SPRN_DEC), mfspr(SPRN_SPRG2));
		printf("sp   = "REG"  sprg3= "REG"\n", sp, mfspr(SPRN_SPRG3));
		printf("toc  = "REG"  dar  = "REG"\n", toc, mfspr(SPRN_DAR));
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#ifdef CONFIG_PPC_ISERIES
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		if (firmware_has_feature(FW_FEATURE_ISERIES)) {
			struct paca_struct *ptrPaca;
			struct lppaca *ptrLpPaca;

			/* Dump out relevant Paca data areas. */
			printf("Paca: \n");
			ptrPaca = get_paca();

			printf("  Local Processor Control Area (LpPaca): \n");
			ptrLpPaca = ptrPaca->lppaca_ptr;
			printf("    Saved Srr0=%.16lx  Saved Srr1=%.16lx \n",
			       ptrLpPaca->saved_srr0, ptrLpPaca->saved_srr1);
			printf("    Saved Gpr3=%.16lx  Saved Gpr4=%.16lx \n",
			       ptrLpPaca->saved_gpr3, ptrLpPaca->saved_gpr4);
			printf("    Saved Gpr5=%.16lx \n", ptrLpPaca->saved_gpr5);
		}
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#endif

		return;
	}

	scanhex(&regno);
	switch (cmd) {
	case 'w':
		val = read_spr(regno);
		scanhex(&val);
		write_spr(regno, val);
		/* fall through */
	case 'r':
		printf("spr %lx = %lx\n", regno, read_spr(regno));
		break;
	}
	scannl();
}

/*
 * Stuff for reading and writing memory safely
 */
int
mread(unsigned long adrs, void *buf, int size)
{
	volatile int n;
	char *p, *q;

	n = 0;
	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();
		p = (char *)adrs;
		q = (char *)buf;
		switch (size) {
		case 2:
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			*(u16 *)q = *(u16 *)p;
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			break;
		case 4:
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			*(u32 *)q = *(u32 *)p;
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			break;
		case 8:
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			*(u64 *)q = *(u64 *)p;
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			break;
		default:
			for( ; n < size; ++n) {
				*q++ = *p++;
				sync();
			}
		}
		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
		n = size;
	}
	catch_memory_errors = 0;
	return n;
}

int
mwrite(unsigned long adrs, void *buf, int size)
{
	volatile int n;
	char *p, *q;

	n = 0;
	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();
		p = (char *) adrs;
		q = (char *) buf;
		switch (size) {
		case 2:
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			*(u16 *)p = *(u16 *)q;
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			break;
		case 4:
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			*(u32 *)p = *(u32 *)q;
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			break;
		case 8:
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			*(u64 *)p = *(u64 *)q;
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			break;
		default:
			for ( ; n < size; ++n) {
				*p++ = *q++;
				sync();
			}
		}
		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
		n = size;
	} else {
		printf("*** Error writing address %x\n", adrs + n);
	}
	catch_memory_errors = 0;
	return n;
}

static int fault_type;
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static int fault_except;
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static char *fault_chars[] = { "--", "**", "##" };

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static int handle_fault(struct pt_regs *regs)
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{
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	fault_except = TRAP(regs);
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	switch (TRAP(regs)) {
	case 0x200:
		fault_type = 0;
		break;
	case 0x300:
	case 0x380:
		fault_type = 1;
		break;
	default:
		fault_type = 2;
	}

	longjmp(bus_error_jmp, 1);

	return 0;
}

#define SWAP(a, b, t)	((t) = (a), (a) = (b), (b) = (t))

void
byterev(unsigned char *val, int size)
{
	int t;
	
	switch (size) {
	case 2:
		SWAP(val[0], val[1], t);
		break;
	case 4:
		SWAP(val[0], val[3], t);
		SWAP(val[1], val[2], t);
		break;
	case 8: /* is there really any use for this? */
		SWAP(val[0], val[7], t);
		SWAP(val[1], val[6], t);
		SWAP(val[2], val[5], t);
		SWAP(val[3], val[4], t);
		break;
	}
}

static int brev;
static int mnoread;

static char *memex_help_string = 
    "Memory examine command usage:\n"
    "m [addr] [flags] examine/change memory\n"
    "  addr is optional.  will start where left off.\n"
    "  flags may include chars from this set:\n"
    "    b   modify by bytes (default)\n"
    "    w   modify by words (2 byte)\n"
    "    l   modify by longs (4 byte)\n"
    "    d   modify by doubleword (8 byte)\n"
    "    r   toggle reverse byte order mode\n"
    "    n   do not read memory (for i/o spaces)\n"
    "    .   ok to read (default)\n"
    "NOTE: flags are saved as defaults\n"
    "";

static char *memex_subcmd_help_string = 
    "Memory examine subcommands:\n"
    "  hexval   write this val to current location\n"
    "  'string' write chars from string to this location\n"
    "  '        increment address\n"
    "  ^        decrement address\n"
    "  /        increment addr by 0x10.  //=0x100, ///=0x1000, etc\n"
    "  \\        decrement addr by 0x10.  \\\\=0x100, \\\\\\=0x1000, etc\n"
    "  `        clear no-read flag\n"
    "  ;        stay at this addr\n"
    "  v        change to byte mode\n"
    "  w        change to word (2 byte) mode\n"
    "  l        change to long (4 byte) mode\n"
    "  u        change to doubleword (8 byte) mode\n"
    "  m addr   change current addr\n"
    "  n        toggle no-read flag\n"
    "  r        toggle byte reverse flag\n"
    "  < count  back up count bytes\n"
    "  > count  skip forward count bytes\n"
    "  x        exit this mode\n"
    "";

void
memex(void)
{
	int cmd, inc, i, nslash;
	unsigned long n;
	unsigned char val[16];

	scanhex((void *)&adrs);
	cmd = skipbl();
	if (cmd == '?') {
		printf(memex_help_string);
		return;
	} else {
		termch = cmd;
	}
	last_cmd = "m\n";
	while ((cmd = skipbl()) != '\n') {
		switch( cmd ){
		case 'b':	size = 1;	break;
		case 'w':	size = 2;	break;
		case 'l':	size = 4;	break;
		case 'd':	size = 8;	break;
		case 'r': 	brev = !brev;	break;
		case 'n':	mnoread = 1;	break;
		case '.':	mnoread = 0;	break;
		}
	}
	if( size <= 0 )
		size = 1;
	else if( size > 8 )
		size = 8;
	for(;;){
		if (!mnoread)
			n = mread(adrs, val, size);
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		printf(REG"%c", adrs, brev? 'r': ' ');
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		if (!mnoread) {
			if (brev)
				byterev(val, size);
			putchar(' ');
			for (i = 0; i < n; ++i)
				printf("%.2x", val[i]);
			for (; i < size; ++i)
				printf("%s", fault_chars[fault_type]);
		}
		putchar(' ');
		inc = size;
		nslash = 0;
		for(;;){
			if( scanhex(&n) ){
				for (i = 0; i < size; ++i)
					val[i] = n >> (i * 8);
				if (!brev)
					byterev(val, size);
				mwrite(adrs, val, size);
				inc = size;
			}
			cmd = skipbl();
			if (cmd == '\n')
				break;
			inc = 0;
			switch (cmd) {
			case '\'':
				for(;;){
					n = inchar();
					if( n == '\\' )
						n = bsesc();
					else if( n == '\'' )
						break;
					for (i = 0; i < size; ++i)
						val[i] = n >> (i * 8);
					if (!brev)
						byterev(val, size);
					mwrite(adrs, val, size);
					adrs += size;
				}
				adrs -= size;
				inc = size;
				break;
			case ',':
				adrs += size;
				break;
			case '.':
				mnoread = 0;
				break;
			case ';':
				break;
			case 'x':
			case EOF:
				scannl();
				return;
			case 'b':
			case 'v':
				size = 1;
				break;
			case 'w':
				size = 2;
				break;
			case 'l':
				size = 4;
				break;
			case 'u':
				size = 8;
				break;
			case '^':
				adrs -= size;
				break;
				break;
			case '/':
				if (nslash > 0)
					adrs -= 1 << nslash;
				else
					nslash = 0;
				nslash += 4;
				adrs += 1 << nslash;
				break;
			case '\\':
				if (nslash < 0)
					adrs += 1 << -nslash;
				else
					nslash = 0;
				nslash -= 4;
				adrs -= 1 << -nslash;
				break;
			case 'm':
				scanhex((void *)&adrs);
				break;
			case 'n':
				mnoread = 1;
				break;
			case 'r':
				brev = !brev;
				break;
			case '<':
				n = size;
				scanhex(&n);
				adrs -= n;
				break;
			case '>':
				n = size;
				scanhex(&n);
				adrs += n;
				break;
			case '?':
				printf(memex_subcmd_help_string);
				break;
			}
		}
		adrs += inc;
	}
}

int
bsesc(void)
{
	int c;

	c = inchar();
	switch( c ){
	case 'n':	c = '\n';	break;
	case 'r':	c = '\r';	break;
	case 'b':	c = '\b';	break;
	case 't':	c = '\t';	break;
	}
	return c;
}

1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
static void xmon_rawdump (unsigned long adrs, long ndump)
{
	long n, m, r, nr;
	unsigned char temp[16];

	for (n = ndump; n > 0;) {
		r = n < 16? n: 16;
		nr = mread(adrs, temp, r);
		adrs += nr;
		for (m = 0; m < r; ++m) {
			if (m < nr)
				printf("%.2x", temp[m]);
			else
				printf("%s", fault_chars[fault_type]);
		}
		n -= r;
		if (nr < r)
			break;
	}
	printf("\n");
}

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#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
			 || ('a' <= (c) && (c) <= 'f') \
			 || ('A' <= (c) && (c) <= 'F'))
void
dump(void)
{
	int c;

	c = inchar();
	if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n')
		termch = c;
	scanhex((void *)&adrs);
	if (termch != '\n')
		termch = 0;
	if (c == 'i') {
		scanhex(&nidump);
		if (nidump == 0)
			nidump = 16;
		else if (nidump > MAX_DUMP)
			nidump = MAX_DUMP;
		adrs += ppc_inst_dump(adrs, nidump, 1);
		last_cmd = "di\n";
2006 2007 2008 2009 2010 2011 2012
	} else if (c == 'r') {
		scanhex(&ndump);
		if (ndump == 0)
			ndump = 64;
		xmon_rawdump(adrs, ndump);
		adrs += ndump;
		last_cmd = "dr\n";
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	} else {
		scanhex(&ndump);
		if (ndump == 0)
			ndump = 64;
		else if (ndump > MAX_DUMP)
			ndump = MAX_DUMP;
		prdump(adrs, ndump);
		adrs += ndump;
		last_cmd = "d\n";
	}
}

void
prdump(unsigned long adrs, long ndump)
{
	long n, m, c, r, nr;
	unsigned char temp[16];

	for (n = ndump; n > 0;) {
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		printf(REG, adrs);
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		putchar(' ');
		r = n < 16? n: 16;
		nr = mread(adrs, temp, r);
		adrs += nr;
		for (m = 0; m < r; ++m) {
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		        if ((m & (sizeof(long) - 1)) == 0 && m > 0)
				putchar(' ');
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			if (m < nr)
				printf("%.2x", temp[m]);
			else
				printf("%s", fault_chars[fault_type]);
		}
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		for (; m < 16; ++m) {
		        if ((m & (sizeof(long) - 1)) == 0)
				putchar(' ');
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			printf("  ");
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		}
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		printf("  |");
		for (m = 0; m < r; ++m) {
			if (m < nr) {
				c = temp[m];
				putchar(' ' <= c && c <= '~'? c: '.');
			} else
				putchar(' ');
		}
		n -= r;
		for (; m < 16; ++m)
			putchar(' ');
		printf("|\n");
		if (nr < r)
			break;
	}
}

2067 2068
typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr);

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int
2070 2071
generic_inst_dump(unsigned long adr, long count, int praddr,
			instruction_dump_func dump_func)
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{
	int nr, dotted;
	unsigned long first_adr;
	unsigned long inst, last_inst = 0;
	unsigned char val[4];

	dotted = 0;
	for (first_adr = adr; count > 0; --count, adr += 4) {
		nr = mread(adr, val, 4);
		if (nr == 0) {
			if (praddr) {
				const char *x = fault_chars[fault_type];
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				printf(REG"  %s%s%s%s\n", adr, x, x, x, x);
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			}
			break;
		}
		inst = GETWORD(val);
		if (adr > first_adr && inst == last_inst) {
			if (!dotted) {
				printf(" ...\n");
				dotted = 1;
			}
			continue;
		}
		dotted = 0;
		last_inst = inst;
		if (praddr)
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			printf(REG"  %.8x", adr, inst);
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		printf("\t");
2101
		dump_func(inst, adr);
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		printf("\n");
	}
	return adr - first_adr;
}

2107 2108 2109 2110 2111 2112
int
ppc_inst_dump(unsigned long adr, long count, int praddr)
{
	return generic_inst_dump(adr, count, praddr, print_insn_powerpc);
}

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void
print_address(unsigned long addr)
{
	xmon_print_symbol(addr, "\t# ", "");
}


/*
 * Memory operations - move, set, print differences
 */
static unsigned long mdest;		/* destination address */
static unsigned long msrc;		/* source address */
static unsigned long mval;		/* byte value to set memory to */
static unsigned long mcount;		/* # bytes to affect */
static unsigned long mdiffs;		/* max # differences to print */

void
memops(int cmd)
{
	scanhex((void *)&mdest);
	if( termch != '\n' )
		termch = 0;
	scanhex((void *)(cmd == 's'? &mval: &msrc));
	if( termch != '\n' )
		termch = 0;
	scanhex((void *)&mcount);
	switch( cmd ){
	case 'm':
		memmove((void *)mdest, (void *)msrc, mcount);
		break;
	case 's':
		memset((void *)mdest, mval, mcount);
		break;
	case 'd':
		if( termch != '\n' )
			termch = 0;
		scanhex((void *)&mdiffs);
		memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs);
		break;
	}
}

void
memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr)
{
	unsigned n, prt;

	prt = 0;
	for( n = nb; n > 0; --n )
		if( *p1++ != *p2++ )
			if( ++prt <= maxpr )
				printf("%.16x %.2x # %.16x %.2x\n", p1 - 1,
					p1[-1], p2 - 1, p2[-1]);
	if( prt > maxpr )
		printf("Total of %d differences\n", prt);
}

static unsigned mend;
static unsigned mask;

void
memlocate(void)
{
	unsigned a, n;
	unsigned char val[4];

	last_cmd = "ml";
	scanhex((void *)&mdest);
	if (termch != '\n') {
		termch = 0;
		scanhex((void *)&mend);
		if (termch != '\n') {
			termch = 0;
			scanhex((void *)&mval);
			mask = ~0;
			if (termch != '\n') termch = 0;
			scanhex((void *)&mask);
		}
	}
	n = 0;
	for (a = mdest; a < mend; a += 4) {
		if (mread(a, val, 4) == 4
			&& ((GETWORD(val) ^ mval) & mask) == 0) {
			printf("%.16x:  %.16x\n", a, GETWORD(val));
			if (++n >= 10)
				break;
		}
	}
}

static unsigned long mskip = 0x1000;
static unsigned long mlim = 0xffffffff;

void
memzcan(void)
{
	unsigned char v;
	unsigned a;
	int ok, ook;

	scanhex(&mdest);
	if (termch != '\n') termch = 0;
	scanhex(&mskip);
	if (termch != '\n') termch = 0;
	scanhex(&mlim);
	ook = 0;
	for (a = mdest; a < mlim; a += mskip) {
		ok = mread(a, &v, 1);
		if (ok && !ook) {
			printf("%.8x .. ", a);
		} else if (!ok && ook)
			printf("%.8x\n", a - mskip);
		ook = ok;
		if (a + mskip < a)
			break;
	}
	if (ook)
		printf("%.8x\n", a - mskip);
}

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void proccall(void)
{
	unsigned long args[8];
	unsigned long ret;
	int i;
	typedef unsigned long (*callfunc_t)(unsigned long, unsigned long,
			unsigned long, unsigned long, unsigned long,
			unsigned long, unsigned long, unsigned long);
	callfunc_t func;

	if (!scanhex(&adrs))
		return;
	if (termch != '\n')
		termch = 0;
	for (i = 0; i < 8; ++i)
		args[i] = 0;
	for (i = 0; i < 8; ++i) {
		if (!scanhex(&args[i]) || termch == '\n')
			break;
		termch = 0;
	}
	func = (callfunc_t) adrs;
	ret = 0;
	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();
		ret = func(args[0], args[1], args[2], args[3],
			   args[4], args[5], args[6], args[7]);
		sync();
		printf("return value is %x\n", ret);
	} else {
		printf("*** %x exception occurred\n", fault_except);
	}
	catch_memory_errors = 0;
}

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/* Input scanning routines */
int
skipbl(void)
{
	int c;

	if( termch != 0 ){
		c = termch;
		termch = 0;
	} else
		c = inchar();
	while( c == ' ' || c == '\t' )
		c = inchar();
	return c;
}

#define N_PTREGS	44
static char *regnames[N_PTREGS] = {
	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
	"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
	"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
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	"pc", "msr", "or3", "ctr", "lr", "xer", "ccr",
#ifdef CONFIG_PPC64
	"softe",
#else
	"mq",
#endif
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	"trap", "dar", "dsisr", "res"
};

int
scanhex(unsigned long *vp)
{
	int c, d;
	unsigned long v;

	c = skipbl();
	if (c == '%') {
		/* parse register name */
		char regname[8];
		int i;

		for (i = 0; i < sizeof(regname) - 1; ++i) {
			c = inchar();
			if (!isalnum(c)) {
				termch = c;
				break;
			}
			regname[i] = c;
		}
		regname[i] = 0;
		for (i = 0; i < N_PTREGS; ++i) {
			if (strcmp(regnames[i], regname) == 0) {
				if (xmon_regs == NULL) {
					printf("regs not available\n");
					return 0;
				}
				*vp = ((unsigned long *)xmon_regs)[i];
				return 1;
			}
		}
		printf("invalid register name '%%%s'\n", regname);
		return 0;
	}

	/* skip leading "0x" if any */

	if (c == '0') {
		c = inchar();
		if (c == 'x') {
			c = inchar();
		} else {
			d = hexdigit(c);
			if (d == EOF) {
				termch = c;
				*vp = 0;
				return 1;
			}
		}
	} else if (c == '$') {
		int i;
		for (i=0; i<63; i++) {
			c = inchar();
			if (isspace(c)) {
				termch = c;
				break;
			}
			tmpstr[i] = c;
		}
		tmpstr[i++] = 0;
2360 2361 2362 2363 2364 2365 2366 2367
		*vp = 0;
		if (setjmp(bus_error_jmp) == 0) {
			catch_memory_errors = 1;
			sync();
			*vp = kallsyms_lookup_name(tmpstr);
			sync();
		}
		catch_memory_errors = 0;
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		if (!(*vp)) {
			printf("unknown symbol '%s'\n", tmpstr);
			return 0;
		}
		return 1;
	}

	d = hexdigit(c);
	if (d == EOF) {
		termch = c;
		return 0;
	}
	v = 0;
	do {
		v = (v << 4) + d;
		c = inchar();
		d = hexdigit(c);
	} while (d != EOF);
	termch = c;
	*vp = v;
	return 1;
}

void
scannl(void)
{
	int c;

	c = termch;
	termch = 0;
	while( c != '\n' )
		c = inchar();
}

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int hexdigit(int c)
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{
	if( '0' <= c && c <= '9' )
		return c - '0';
	if( 'A' <= c && c <= 'F' )
		return c - ('A' - 10);
	if( 'a' <= c && c <= 'f' )
		return c - ('a' - 10);
	return EOF;
}

void
getstring(char *s, int size)
{
	int c;

	c = skipbl();
	do {
		if( size > 1 ){
			*s++ = c;
			--size;
		}
		c = inchar();
	} while( c != ' ' && c != '\t' && c != '\n' );
	termch = c;
	*s = 0;
}

static char line[256];
static char *lineptr;

void
flush_input(void)
{
	lineptr = NULL;
}

int
inchar(void)
{
	if (lineptr == NULL || *lineptr == 0) {
2443
		if (xmon_gets(line, sizeof(line)) == NULL) {
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			lineptr = NULL;
			return EOF;
		}
		lineptr = line;
	}
	return *lineptr++;
}

void
take_input(char *str)
{
	lineptr = str;
}


static void
symbol_lookup(void)
{
	int type = inchar();
	unsigned long addr;
	static char tmp[64];

	switch (type) {
	case 'a':
		if (scanhex(&addr))
			xmon_print_symbol(addr, ": ", "\n");
		termch = 0;
		break;
	case 's':
		getstring(tmp, 64);
		if (setjmp(bus_error_jmp) == 0) {
			catch_memory_errors = 1;
			sync();
			addr = kallsyms_lookup_name(tmp);
			if (addr)
				printf("%s: %lx\n", tmp, addr);
			else
				printf("Symbol '%s' not found.\n", tmp);
			sync();
		}
		catch_memory_errors = 0;
		termch = 0;
		break;
	}
}


/* Print an address in numeric and symbolic form (if possible) */
static void xmon_print_symbol(unsigned long address, const char *mid,
			      const char *after)
{
	char *modname;
	const char *name = NULL;
	unsigned long offset, size;

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	printf(REG, address);
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	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();
		name = kallsyms_lookup(address, &size, &offset, &modname,
				       tmpstr);
		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
	}

	catch_memory_errors = 0;

	if (name) {
		printf("%s%s+%#lx/%#lx", mid, name, offset, size);
		if (modname)
			printf(" [%s]", modname);
	}
	printf("%s", after);
}

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#ifdef CONFIG_PPC64
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static void dump_slb(void)
{
	int i;
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	unsigned long esid,vsid,valid;
	unsigned long llp;
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	printf("SLB contents of cpu %x\n", smp_processor_id());

2529
	for (i = 0; i < mmu_slb_size; i++) {
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		asm volatile("slbmfee  %0,%1" : "=r" (esid) : "r" (i));
		asm volatile("slbmfev  %0,%1" : "=r" (vsid) : "r" (i));
		valid = (esid & SLB_ESID_V);
		if (valid | esid | vsid) {
			printf("%02d %016lx %016lx", i, esid, vsid);
			if (valid) {
				llp = vsid & SLB_VSID_LLP;
				if (vsid & SLB_VSID_B_1T) {
					printf("  1T  ESID=%9lx  VSID=%13lx LLP:%3lx \n",
						GET_ESID_1T(esid),
						(vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
						llp);
				} else {
					printf(" 256M ESID=%9lx  VSID=%13lx LLP:%3lx \n",
						GET_ESID(esid),
						(vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
						llp);
				}
			} else
				printf("\n");
		}
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	}
}

static void dump_stab(void)
{
	int i;
	unsigned long *tmp = (unsigned long *)get_paca()->stab_addr;

	printf("Segment table contents of cpu %x\n", smp_processor_id());

	for (i = 0; i < PAGE_SIZE/16; i++) {
		unsigned long a, b;

		a = *tmp++;
		b = *tmp++;

		if (a || b) {
			printf("%03d %016lx ", i, a);
			printf("%016lx\n", b);
		}
	}
}

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void dump_segments(void)
{
	if (cpu_has_feature(CPU_FTR_SLB))
		dump_slb();
	else
		dump_stab();
}
#endif

#ifdef CONFIG_PPC_STD_MMU_32
void dump_segments(void)
{
	int i;

	printf("sr0-15 =");
	for (i = 0; i < 16; ++i)
		printf(" %x", mfsrin(i));
	printf("\n");
}
#endif

2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620
#ifdef CONFIG_44x
static void dump_tlb_44x(void)
{
	int i;

	for (i = 0; i < PPC44x_TLB_SIZE; i++) {
		unsigned long w0,w1,w2;
		asm volatile("tlbre  %0,%1,0" : "=r" (w0) : "r" (i));
		asm volatile("tlbre  %0,%1,1" : "=r" (w1) : "r" (i));
		asm volatile("tlbre  %0,%1,2" : "=r" (w2) : "r" (i));
		printf("[%02x] %08x %08x %08x ", i, w0, w1, w2);
		if (w0 & PPC44x_TLB_VALID) {
			printf("V %08x -> %01x%08x %c%c%c%c%c",
			       w0 & PPC44x_TLB_EPN_MASK,
			       w1 & PPC44x_TLB_ERPN_MASK,
			       w1 & PPC44x_TLB_RPN_MASK,
			       (w2 & PPC44x_TLB_W) ? 'W' : 'w',
			       (w2 & PPC44x_TLB_I) ? 'I' : 'i',
			       (w2 & PPC44x_TLB_M) ? 'M' : 'm',
			       (w2 & PPC44x_TLB_G) ? 'G' : 'g',
			       (w2 & PPC44x_TLB_E) ? 'E' : 'e');
		}
		printf("\n");
	}
}
#endif /* CONFIG_44x */
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void xmon_init(int enable)
{
2623 2624 2625 2626
#ifdef CONFIG_PPC_ISERIES
	if (firmware_has_feature(FW_FEATURE_ISERIES))
		return;
#endif
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	if (enable) {
		__debugger = xmon;
		__debugger_ipi = xmon_ipi;
		__debugger_bpt = xmon_bpt;
		__debugger_sstep = xmon_sstep;
		__debugger_iabr_match = xmon_iabr_match;
		__debugger_dabr_match = xmon_dabr_match;
		__debugger_fault_handler = xmon_fault_handler;
	} else {
		__debugger = NULL;
		__debugger_ipi = NULL;
		__debugger_bpt = NULL;
		__debugger_sstep = NULL;
		__debugger_iabr_match = NULL;
		__debugger_dabr_match = NULL;
		__debugger_fault_handler = NULL;
	}
2644
	xmon_map_scc();
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}
2646 2647

#ifdef CONFIG_MAGIC_SYSRQ
2648
static void sysrq_handle_xmon(int key, struct tty_struct *tty) 
2649 2650 2651
{
	/* ensure xmon is enabled */
	xmon_init(1);
2652
	debugger(get_irq_regs());
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}

static struct sysrq_key_op sysrq_xmon_op = 
{
	.handler =	sysrq_handle_xmon,
	.help_msg =	"Xmon",
	.action_msg =	"Entering xmon",
};

static int __init setup_xmon_sysrq(void)
{
2664 2665 2666 2667
#ifdef CONFIG_PPC_ISERIES
	if (firmware_has_feature(FW_FEATURE_ISERIES))
		return 0;
#endif
2668 2669 2670 2671 2672
	register_sysrq_key('x', &sysrq_xmon_op);
	return 0;
}
__initcall(setup_xmon_sysrq);
#endif /* CONFIG_MAGIC_SYSRQ */
2673

2674
static int __initdata xmon_early, xmon_off;
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static int __init early_parse_xmon(char *p)
{
	if (!p || strncmp(p, "early", 5) == 0) {
		/* just "xmon" is equivalent to "xmon=early" */
		xmon_init(1);
		xmon_early = 1;
	} else if (strncmp(p, "on", 2) == 0)
		xmon_init(1);
	else if (strncmp(p, "off", 3) == 0)
		xmon_off = 1;
	else if (strncmp(p, "nobt", 4) == 0)
		xmon_no_auto_backtrace = 1;
	else
		return 1;

	return 0;
}
early_param("xmon", early_parse_xmon);

void __init xmon_setup(void)
{
#ifdef CONFIG_XMON_DEFAULT
	if (!xmon_off)
		xmon_init(1);
#endif
	if (xmon_early)
		debugger(NULL);
}
2704

2705
#ifdef CONFIG_SPU_BASE
2706 2707 2708 2709 2710

struct spu_info {
	struct spu *spu;
	u64 saved_mfc_sr1_RW;
	u32 saved_spu_runcntl_RW;
2711
	unsigned long dump_addr;
2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730
	u8 stopped_ok;
};

#define XMON_NUM_SPUS	16	/* Enough for current hardware */

static struct spu_info spu_info[XMON_NUM_SPUS];

void xmon_register_spus(struct list_head *list)
{
	struct spu *spu;

	list_for_each_entry(spu, list, full_list) {
		if (spu->number >= XMON_NUM_SPUS) {
			WARN_ON(1);
			continue;
		}

		spu_info[spu->number].spu = spu;
		spu_info[spu->number].stopped_ok = 0;
2731 2732
		spu_info[spu->number].dump_addr = (unsigned long)
				spu_info[spu->number].spu->local_store;
2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764
	}
}

static void stop_spus(void)
{
	struct spu *spu;
	int i;
	u64 tmp;

	for (i = 0; i < XMON_NUM_SPUS; i++) {
		if (!spu_info[i].spu)
			continue;

		if (setjmp(bus_error_jmp) == 0) {
			catch_memory_errors = 1;
			sync();

			spu = spu_info[i].spu;

			spu_info[i].saved_spu_runcntl_RW =
				in_be32(&spu->problem->spu_runcntl_RW);

			tmp = spu_mfc_sr1_get(spu);
			spu_info[i].saved_mfc_sr1_RW = tmp;

			tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
			spu_mfc_sr1_set(spu, tmp);

			sync();
			__delay(200);

			spu_info[i].stopped_ok = 1;
2765 2766 2767 2768

			printf("Stopped spu %.2d (was %s)\n", i,
					spu_info[i].saved_spu_runcntl_RW ?
					"running" : "stopped");
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		} else {
			catch_memory_errors = 0;
			printf("*** Error stopping spu %.2d\n", i);
		}
		catch_memory_errors = 0;
	}
}

static void restart_spus(void)
{
	struct spu *spu;
	int i;

	for (i = 0; i < XMON_NUM_SPUS; i++) {
		if (!spu_info[i].spu)
			continue;

		if (!spu_info[i].stopped_ok) {
			printf("*** Error, spu %d was not successfully stopped"
					", not restarting\n", i);
			continue;
		}

		if (setjmp(bus_error_jmp) == 0) {
			catch_memory_errors = 1;
			sync();

			spu = spu_info[i].spu;
			spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW);
			out_be32(&spu->problem->spu_runcntl_RW,
					spu_info[i].saved_spu_runcntl_RW);

			sync();
			__delay(200);

			printf("Restarted spu %.2d\n", i);
		} else {
			catch_memory_errors = 0;
			printf("*** Error restarting spu %.2d\n", i);
		}
		catch_memory_errors = 0;
	}
}

2813
#define DUMP_WIDTH	23
2814
#define DUMP_VALUE(format, field, value)				\
2815 2816 2817 2818 2819
do {									\
	if (setjmp(bus_error_jmp) == 0) {				\
		catch_memory_errors = 1;				\
		sync();							\
		printf("  %-*s = "format"\n", DUMP_WIDTH,		\
2820
				#field, value);				\
2821 2822 2823 2824 2825 2826 2827 2828 2829 2830
		sync();							\
		__delay(200);						\
	} else {							\
		catch_memory_errors = 0;				\
		printf("  %-*s = *** Error reading field.\n",		\
					DUMP_WIDTH, #field);		\
	}								\
	catch_memory_errors = 0;					\
} while (0)

2831 2832 2833
#define DUMP_FIELD(obj, format, field)	\
	DUMP_VALUE(format, field, obj->field)

2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
static void dump_spu_fields(struct spu *spu)
{
	printf("Dumping spu fields at address %p:\n", spu);

	DUMP_FIELD(spu, "0x%x", number);
	DUMP_FIELD(spu, "%s", name);
	DUMP_FIELD(spu, "0x%lx", local_store_phys);
	DUMP_FIELD(spu, "0x%p", local_store);
	DUMP_FIELD(spu, "0x%lx", ls_size);
	DUMP_FIELD(spu, "0x%x", node);
	DUMP_FIELD(spu, "0x%lx", flags);
	DUMP_FIELD(spu, "%d", class_0_pending);
2846 2847 2848
	DUMP_FIELD(spu, "0x%lx", class_0_dar);
	DUMP_FIELD(spu, "0x%lx", class_1_dar);
	DUMP_FIELD(spu, "0x%lx", class_1_dsisr);
2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859
	DUMP_FIELD(spu, "0x%lx", irqs[0]);
	DUMP_FIELD(spu, "0x%lx", irqs[1]);
	DUMP_FIELD(spu, "0x%lx", irqs[2]);
	DUMP_FIELD(spu, "0x%x", slb_replace);
	DUMP_FIELD(spu, "%d", pid);
	DUMP_FIELD(spu, "0x%p", mm);
	DUMP_FIELD(spu, "0x%p", ctx);
	DUMP_FIELD(spu, "0x%p", rq);
	DUMP_FIELD(spu, "0x%p", timestamp);
	DUMP_FIELD(spu, "0x%lx", problem_phys);
	DUMP_FIELD(spu, "0x%p", problem);
2860 2861 2862 2863 2864 2865
	DUMP_VALUE("0x%x", problem->spu_runcntl_RW,
			in_be32(&spu->problem->spu_runcntl_RW));
	DUMP_VALUE("0x%x", problem->spu_status_R,
			in_be32(&spu->problem->spu_status_R));
	DUMP_VALUE("0x%x", problem->spu_npc_RW,
			in_be32(&spu->problem->spu_npc_RW));
2866
	DUMP_FIELD(spu, "0x%p", priv2);
2867
	DUMP_FIELD(spu, "0x%p", pdata);
2868 2869
}

2870 2871 2872 2873 2874 2875 2876
int
spu_inst_dump(unsigned long adr, long count, int praddr)
{
	return generic_inst_dump(adr, count, praddr, print_insn_spu);
}

static void dump_spu_ls(unsigned long num, int subcmd)
2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902
{
	unsigned long offset, addr, ls_addr;

	if (setjmp(bus_error_jmp) == 0) {
		catch_memory_errors = 1;
		sync();
		ls_addr = (unsigned long)spu_info[num].spu->local_store;
		sync();
		__delay(200);
	} else {
		catch_memory_errors = 0;
		printf("*** Error: accessing spu info for spu %d\n", num);
		return;
	}
	catch_memory_errors = 0;

	if (scanhex(&offset))
		addr = ls_addr + offset;
	else
		addr = spu_info[num].dump_addr;

	if (addr >= ls_addr + LS_SIZE) {
		printf("*** Error: address outside of local store\n");
		return;
	}

2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913
	switch (subcmd) {
	case 'i':
		addr += spu_inst_dump(addr, 16, 1);
		last_cmd = "sdi\n";
		break;
	default:
		prdump(addr, 64);
		addr += 64;
		last_cmd = "sd\n";
		break;
	}
2914 2915 2916 2917

	spu_info[num].dump_addr = addr;
}

2918 2919
static int do_spu_cmd(void)
{
2920
	static unsigned long num = 0;
2921
	int cmd, subcmd = 0;
2922 2923 2924 2925 2926 2927 2928 2929 2930

	cmd = inchar();
	switch (cmd) {
	case 's':
		stop_spus();
		break;
	case 'r':
		restart_spus();
		break;
2931
	case 'd':
2932 2933 2934 2935
		subcmd = inchar();
		if (isxdigit(subcmd) || subcmd == '\n')
			termch = subcmd;
	case 'f':
2936 2937
		scanhex(&num);
		if (num >= XMON_NUM_SPUS || !spu_info[num].spu) {
2938
			printf("*** Error: invalid spu number\n");
2939 2940 2941 2942 2943 2944 2945 2946
			return 0;
		}

		switch (cmd) {
		case 'f':
			dump_spu_fields(spu_info[num].spu);
			break;
		default:
2947
			dump_spu_ls(num, subcmd);
2948 2949 2950
			break;
		}

2951
		break;
2952 2953 2954 2955 2956 2957
	default:
		return -1;
	}

	return 0;
}
2958
#else /* ! CONFIG_SPU_BASE */
2959 2960 2961 2962 2963
static int do_spu_cmd(void)
{
	return -1;
}
#endif