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-rw-r--r--arch/powerpc/xmon/xmon.c2561
1 files changed, 2561 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
new file mode 100644
index 000000000000..c45a6ad5f3b7
--- /dev/null
+++ b/arch/powerpc/xmon/xmon.c
@@ -0,0 +1,2561 @@
+/*
+ * Routines providing a simple monitor for use on the PowerMac.
+ *
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ * 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/config.h>
+#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>
+#include <linux/module.h>
+#include <linux/sysrq.h>
+#include <linux/interrupt.h>
+
+#include <asm/ptrace.h>
+#include <asm/string.h>
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/xmon.h>
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
+#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>
+#include <asm/bug.h>
+
+#ifdef CONFIG_PPC64
+#include <asm/hvcall.h>
+#include <asm/paca.h>
+#endif
+
+#include "nonstdio.h"
+
+#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];
+
+#define JMP_BUF_LEN 23
+static long bus_error_jmp[JMP_BUF_LEN];
+static int catch_memory_errors;
+static long *xmon_fault_jmp[NR_CPUS];
+#define setjmp xmon_setjmp
+#define longjmp xmon_longjmp
+
+/* 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);
+void print_address(unsigned long);
+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);
+static void proccall(void);
+void dump_segments(void);
+static void symbol_lookup(void);
+static void xmon_print_symbol(unsigned long address, const char *mid,
+ const char *after);
+static const char *getvecname(unsigned long vec);
+
+extern int print_insn_powerpc(unsigned long, unsigned long, int);
+
+extern void xmon_enter(void);
+extern void xmon_leave(void);
+
+extern long setjmp(long *);
+extern void longjmp(long *, long);
+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
+
+#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\
+ 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\
+ p call a procedure\n\
+ r print registers\n\
+ s single step\n\
+ S print special registers\n\
+ t print backtrace\n\
+ x exit monitor and recover\n\
+ 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
+" ? help\n"
+" zr reboot\n\
+ zh halt\n"
+;
+
+static struct pt_regs *xmon_regs;
+
+static inline void sync(void)
+{
+ asm volatile("sync; isync");
+}
+
+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));
+}
+
+/*
+ * 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
+
+int xmon_core(struct pt_regs *regs, int fromipi)
+{
+ int cmd = 0;
+ unsigned long msr;
+ struct bpt *bp;
+ long recurse_jmp[JMP_BUF_LEN];
+ unsigned long offset;
+#ifdef CONFIG_SMP
+ int cpu;
+ int secondary;
+ unsigned long timeout;
+#endif
+
+ msr = mfmsr();
+ mtmsr(msr & ~MSR_EE); /* disable interrupts */
+
+ 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)));
+ release_output_lock();
+ longjmp(xmon_fault_jmp[cpu], 1);
+ }
+
+ if (setjmp(recurse_jmp) != 0) {
+ if (!in_xmon || !xmon_gate) {
+ get_output_lock();
+ printf("xmon: WARNING: bad recursive fault "
+ "on cpu 0x%x\n", cpu);
+ release_output_lock();
+ 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();
+
+ mtmsr(msr); /* restore interrupt enable */
+
+ return cmd != 'X';
+}
+
+int xmon(struct pt_regs *excp)
+{
+ struct pt_regs regs;
+
+ if (excp == NULL) {
+ xmon_save_regs(&regs);
+ excp = &regs;
+ }
+ return xmon_core(excp, 0);
+}
+EXPORT_SYMBOL(xmon);
+
+irqreturn_t
+xmon_irq(int irq, void *d, struct pt_regs *regs)
+{
+ unsigned long flags;
+ local_irq_save(flags);
+ printf("Keyboard interrupt\n");
+ xmon(regs);
+ local_irq_restore(flags);
+ return IRQ_HANDLED;
+}
+
+int xmon_bpt(struct pt_regs *regs)
+{
+ 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;
+}
+
+int xmon_sstep(struct pt_regs *regs)
+{
+ if (user_mode(regs))
+ return 0;
+ xmon_core(regs, 0);
+ return 1;
+}
+
+int xmon_dabr_match(struct pt_regs *regs)
+{
+ if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
+ return 0;
+ if (dabr.enabled == 0)
+ return 0;
+ xmon_core(regs, 0);
+ return 1;
+}
+
+int xmon_iabr_match(struct pt_regs *regs)
+{
+ 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;
+}
+
+int xmon_ipi(struct pt_regs *regs)
+{
+#ifdef CONFIG_SMP
+ if (in_xmon && !cpu_isset(smp_processor_id(), cpus_in_xmon))
+ xmon_core(regs, 1);
+#endif
+ return 0;
+}
+
+int xmon_fault_handler(struct pt_regs *regs)
+{
+ 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)
+ set_dabr(dabr.address | (dabr.enabled & 7));
+ if (iabr && cpu_has_feature(CPU_FTR_IABR))
+ mtspr(SPRN_IABR, iabr->address
+ | (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)
+{
+ set_dabr(0);
+ if (cpu_has_feature(CPU_FTR_IABR))
+ mtspr(SPRN_IABR, 0);
+}
+
+/* Command interpreting routine */
+static char *last_cmd;
+
+static int
+cmds(struct pt_regs *excp)
+{
+ int cmd = 0;
+
+ last_cmd = NULL;
+ xmon_regs = excp;
+ 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':
+ if (do_step(excp))
+ return cmd;
+ break;
+ case 'x':
+ case 'X':
+ case EOF:
+ return cmd;
+ case '?':
+ printf(help_string);
+ break;
+ case 'b':
+ bpt_cmds();
+ break;
+ case 'C':
+ csum();
+ break;
+ case 'c':
+ if (cpu_cmd())
+ return 0;
+ break;
+ case 'z':
+ bootcmds();
+ break;
+ case 'p':
+ proccall();
+ break;
+#ifdef CONFIG_PPC_STD_MMU
+ case 'u':
+ dump_segments();
+ break;
+#endif
+ 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;
+ if (addr < KERNELBASE) {
+ 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) {
+#ifndef CONFIG_8xx
+ 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)) {
+ if (dabr.address < KERNELBASE) {
+ 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;
+#endif
+
+ 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) {
+ printf(" data "REG" [", dabr.address);
+ 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;
+ char *modname;
+
+ *startp = *endp = 0;
+ if (pc == 0)
+ return;
+ if (setjmp(bus_error_jmp) == 0) {
+ catch_memory_errors = 1;
+ sync();
+ name = kallsyms_lookup(pc, &size, &offset, &modname, tmpstr);
+ if (name != NULL) {
+ *startp = pc - offset;
+ *endp = pc - offset + size;
+ }
+ sync();
+ }
+ catch_memory_errors = 0;
+}
+
+static int xmon_depth_to_print = 64;
+
+#ifdef CONFIG_PPC64
+#define LRSAVE_OFFSET 0x10
+#define REG_FRAME_MARKER 0x7265677368657265ul /* "regshere" */
+#define MARKER_OFFSET 0x60
+#define REGS_OFFSET 0x70
+#else
+#define LRSAVE_OFFSET 4
+#define REG_FRAME_MARKER 0x72656773
+#define MARKER_OFFSET 8
+#define REGS_OFFSET 16
+#endif
+
+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;
+ }
+
+ if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long))
+ || !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)
+ mread(newsp + LRSAVE_OFFSET, &nextip,
+ 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) {
+ printf("["REG"] ", sp);
+ xmon_print_symbol(ip, " ", " (unreliable)\n");
+ }
+ pc = lr = 0;
+
+ } else {
+ printf("["REG"] ", sp);
+ xmon_print_symbol(ip, " ", "\n");
+ }
+
+ /* Look for "regshere" marker to see if this is
+ an exception frame. */
+ if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long))
+ && marker == REG_FRAME_MARKER) {
+ if (mread(sp + REGS_OFFSET, &regs, sizeof(regs))
+ != sizeof(regs)) {
+ printf("Couldn't read registers at %lx\n",
+ sp + REGS_OFFSET);
+ 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)
+{
+ struct bug_entry *bug;
+ 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;
+ if (bug->line & BUG_WARNING_TRAP)
+ return;
+
+ printf("kernel BUG in %s at %s:%d!\n",
+ bug->function, bug->file, (unsigned int)bug->line);
+}
+
+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);
+#ifdef CONFIG_PPC64
+ printf(" paca = 0x%lx\n", get_paca());
+#endif
+ 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)
+{
+ int n, trap;
+ 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;
+ printf("*** Error reading registers from "REG"\n",
+ base);
+ return;
+ }
+ catch_memory_errors = 0;
+ fp = &regs;
+ }
+
+#ifdef CONFIG_PPC64
+ if (FULL_REGS(fp)) {
+ for (n = 0; n < 16; ++n)
+ printf("R%.2ld = "REG" R%.2ld = "REG"\n",
+ n, fp->gpr[n], n+16, fp->gpr[n+16]);
+ } else {
+ for (n = 0; n < 7; ++n)
+ printf("R%.2ld = "REG" R%.2ld = "REG"\n",
+ n, fp->gpr[n], n+7, fp->gpr[n+7]);
+ }
+#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
+ printf("pc = ");
+ xmon_print_symbol(fp->nip, " ", "\n");
+ printf("lr = ");
+ xmon_print_symbol(fp->link, " ", "\n");
+ printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr);
+ printf("ctr = "REG" xer = "REG" trap = %4lx\n",
+ fp->ctr, fp->xer, fp->trap);
+ trap = TRAP(fp);
+ if (trap == 0x300 || trap == 0x380 || trap == 0x600)
+ printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr);
+}
+
+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;
+#ifdef CONFIG_PPC64
+ unsigned long opd[3];
+
+ opd[0] = (unsigned long)instrs;
+ opd[1] = 0;
+ opd[2] = 0;
+ 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;
+ 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);
+#ifdef CONFIG_PPC64
+ unsigned long opd[3];
+
+ opd[0] = (unsigned long)instrs;
+ opd[1] = 0;
+ opd[2] = 0;
+ 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;
+ 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;
+
+void super_regs(void)
+{
+ int cmd;
+ unsigned long val;
+#ifdef CONFIG_PPC_ISERIES
+ struct paca_struct *ptrPaca = NULL;
+ struct lppaca *ptrLpPaca = NULL;
+ struct ItLpRegSave *ptrLpRegSave = NULL;
+#endif
+
+ cmd = skipbl();
+ if (cmd == '\n') {
+ unsigned long sp, toc;
+ asm("mr %0,1" : "=r" (sp) :);
+ asm("mr %0,2" : "=r" (toc) :);
+
+ 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));
+#ifdef CONFIG_PPC_ISERIES
+ // 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);
+
+ printf(" Local Processor Register Save Area (LpRegSave): \n");
+ ptrLpRegSave = ptrPaca->reg_save_ptr;
+ printf(" Saved Sprg0=%.16lx Saved Sprg1=%.16lx \n",
+ ptrLpRegSave->xSPRG0, ptrLpRegSave->xSPRG0);
+ printf(" Saved Sprg2=%.16lx Saved Sprg3=%.16lx \n",
+ ptrLpRegSave->xSPRG2, ptrLpRegSave->xSPRG3);
+ printf(" Saved Msr =%.16lx Saved Nia =%.16lx \n",
+ ptrLpRegSave->xMSR, ptrLpRegSave->xNIA);
+#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:
+ *(u16 *)q = *(u16 *)p;
+ break;
+ case 4:
+ *(u32 *)q = *(u32 *)p;
+ break;
+ case 8:
+ *(u64 *)q = *(u64 *)p;
+ 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:
+ *(u16 *)p = *(u16 *)q;
+ break;
+ case 4:
+ *(u32 *)p = *(u32 *)q;
+ break;
+ case 8:
+ *(u64 *)p = *(u64 *)q;
+ 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;
+static int fault_except;
+static char *fault_chars[] = { "--", "**", "##" };
+
+static int handle_fault(struct pt_regs *regs)
+{
+ fault_except = TRAP(regs);
+ 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);
+ printf(REG"%c", adrs, brev? 'r': ' ');
+ 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;
+}
+
+#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";
+ } 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;) {
+ printf(REG, adrs);
+ putchar(' ');
+ r = n < 16? n: 16;
+ nr = mread(adrs, temp, r);
+ adrs += nr;
+ for (m = 0; m < r; ++m) {
+ if ((m & (sizeof(long) - 1)) == 0 && m > 0)
+ putchar(' ');
+ if (m < nr)
+ printf("%.2x", temp[m]);
+ else
+ printf("%s", fault_chars[fault_type]);
+ }
+ for (; m < 16; ++m) {
+ if ((m & (sizeof(long) - 1)) == 0)
+ putchar(' ');
+ printf(" ");
+ }
+ 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;
+ }
+}
+
+int
+ppc_inst_dump(unsigned long adr, long count, int praddr)
+{
+ 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];
+ printf(REG" %s%s%s%s\n", adr, x, x, x, x);
+ }
+ 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)
+ printf(REG" %.8x", adr, inst);
+ printf("\t");
+ print_insn_powerpc(inst, adr, 0); /* always returns 4 */
+ printf("\n");
+ }
+ return adr - first_adr;
+}
+
+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);
+}
+
+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;
+}
+
+/* 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",
+ "pc", "msr", "or3", "ctr", "lr", "xer", "ccr",
+#ifdef CONFIG_PPC64
+ "softe",
+#else
+ "mq",
+#endif
+ "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;
+ *vp = 0;
+ if (setjmp(bus_error_jmp) == 0) {
+ catch_memory_errors = 1;
+ sync();
+ *vp = kallsyms_lookup_name(tmpstr);
+ sync();
+ }
+ catch_memory_errors = 0;
+ 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();
+}
+
+int hexdigit(int c)
+{
+ 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) {
+ if (xmon_gets(line, sizeof(line)) == NULL) {
+ 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;
+
+ printf(REG, address);
+ 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);
+}
+
+#ifdef CONFIG_PPC64
+static void dump_slb(void)
+{
+ int i;
+ unsigned long tmp;
+
+ printf("SLB contents of cpu %x\n", smp_processor_id());
+
+ for (i = 0; i < SLB_NUM_ENTRIES; i++) {
+ asm volatile("slbmfee %0,%1" : "=r" (tmp) : "r" (i));
+ printf("%02d %016lx ", i, tmp);
+
+ asm volatile("slbmfev %0,%1" : "=r" (tmp) : "r" (i));
+ printf("%016lx\n", tmp);
+ }
+}
+
+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);
+ }
+ }
+}
+
+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
+
+void xmon_init(int enable)
+{
+ 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;
+ }
+ xmon_map_scc();
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static void sysrq_handle_xmon(int key, struct pt_regs *pt_regs,
+ struct tty_struct *tty)
+{
+ /* ensure xmon is enabled */
+ xmon_init(1);
+ debugger(pt_regs);
+}
+
+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)
+{
+ register_sysrq_key('x', &sysrq_xmon_op);
+ return 0;
+}
+__initcall(setup_xmon_sysrq);
+#endif /* CONFIG_MAGIC_SYSRQ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 13:46:13 +0100