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xmon.c

/*
 * Routines providing a simple monitor for use on the PowerMac.
 *
 * Copyright (C) 1996 Paul Mackerras.
 */
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/kallsyms.h>
#include <asm/ptrace.h>
#include <asm/string.h>
#include <asm/machdep.h>
#include <asm/xmon.h>
#include "nonstdio.h"
#include "privinst.h"

#define scanhex   xmon_scanhex
#define skipbl    xmon_skipbl

#ifdef CONFIG_SMP
static unsigned long cpus_in_xmon = 0;
static unsigned long got_xmon = 0;
static volatile int take_xmon = -1;
#endif /* CONFIG_SMP */

static unsigned adrs;
static int size = 1;
static unsigned ndump = 64;
static unsigned nidump = 16;
static unsigned ncsum = 4096;
static int termch;

static u_int bus_error_jmp[100];
#define setjmp xmon_setjmp
#define longjmp xmon_longjmp

/* Breakpoint stuff */
struct bpt {
      unsigned address;
      unsigned instr;
      unsigned count;
      unsigned char enabled;
};

#define NBPTS     16
static struct bpt bpts[NBPTS];
static struct bpt dabr;
static struct bpt iabr;
static unsigned bpinstr = 0x7fe00008;     /* trap */

/* Prototypes */
extern void (*debugger_fault_handler)(struct pt_regs *);
static int cmds(struct pt_regs *);
static int mread(unsigned, void *, int);
static int mwrite(unsigned, void *, int);
static void 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, int);
#ifdef __MWERKS__
static void prndump(unsigned, int);
static int nvreadb(unsigned);
#endif
static int ppc_inst_dump(unsigned, int);
void print_address(unsigned);
static int getsp(void);
static void dump_hash_table(void);
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 *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 void openforth(void); */
static unsigned read_spr(int);
static void write_spr(int, unsigned);
static void super_regs(void);
static void symbol_lookup(void);
static void remove_bpts(void);
static void insert_bpts(void);
static struct bpt *at_breakpoint(unsigned pc);
static void bpt_cmds(void);
void cacheflush(void);
#ifdef CONFIG_SMP
static void cpu_cmd(void);
#endif /* CONFIG_SMP */
static void csum(void);
static void bootcmds(void);
static void proccall(void);
static void printtime(void);

extern int print_insn_big_powerpc(FILE *, unsigned long, unsigned);
extern void printf(const char *fmt, ...);
extern int putchar(int ch);
extern int setjmp(u_int *);
extern void longjmp(u_int *, int);

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

static unsigned start_tb[NR_CPUS][2];
static unsigned stop_tb[NR_CPUS][2];

#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\
  d   dump bytes\n\
  di  dump instructions\n\
  df  dump float values\n\
  dd  dump double values\n\
  e   print exception information\n\
  h   dump hash table\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\
  r   print registers\n\
  S   print special registers\n\
  t   print backtrace\n\
  la  lookup address\n\
  ls  lookup symbol\n\
  C   checksum\n\
  p   call function with arguments\n\
  T   print time\n\
  x   exit monitor\n\
  zr    reboot\n\
  zh    halt\n\
";

static int xmon_trace[NR_CPUS];
#define SSTEP     1           /* stepping because of 's' command */
#define BRSTEP    2           /* stepping over breakpoint */

#ifdef CONFIG_4xx
#define MSR_SSTEP_ENABLE 0x200
#else
#define MSR_SSTEP_ENABLE 0x400
#endif

static struct pt_regs *xmon_regs[NR_CPUS];

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

extern inline void __delay(unsigned int loops)
{
      if (loops != 0)
            __asm__ __volatile__("mtctr %0; 1: bdnz 1b" : :
                             "r" (loops) : "ctr");
}

/* 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;
      static char tmpstr[128];

      printf("%.8lx", address);
      if (setjmp(bus_error_jmp) == 0) {
            debugger_fault_handler = handle_fault;
            sync();
            name = kallsyms_lookup(address, &size, &offset, &modname,
                               tmpstr);
            sync();
            /* wait a little while to see if we get a machine check */
            __delay(200);
      }
      debugger_fault_handler = NULL;

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

static void get_tb(unsigned *p)
{
      unsigned hi, lo, hiagain;

      if ((get_pvr() >> 16) == 1)
            return;

      do {
            asm volatile("mftbu %0; mftb %1; mftbu %2"
                       : "=r" (hi), "=r" (lo), "=r" (hiagain));
      } while (hi != hiagain);
      p[0] = hi;
      p[1] = lo;
}

static inline void xmon_enable_sstep(struct pt_regs *regs)
{
      regs->msr |= MSR_SSTEP_ENABLE;
#ifdef CONFIG_4xx
      mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
#endif
}

int xmon(struct pt_regs *excp)
{
      struct pt_regs regs;
      int msr, cmd;

      get_tb(stop_tb[smp_processor_id()]);
      if (excp == NULL) {
            asm volatile ("stw      0,0(%0)\n\
                  lwz   0,0(1)\n\
                  stw   0,4(%0)\n\
                  stmw  2,8(%0)" : : "b" (&regs));
            regs.nip = regs.link = ((unsigned long *)regs.gpr[1])[1];
            regs.msr = get_msr();
            regs.ctr = get_ctr();
            regs.xer = get_xer();
            regs.ccr = get_cr();
            regs.trap = 0;
            excp = &regs;
      }

      msr = get_msr();
      set_msr(msr & ~0x8000); /* disable interrupts */
      xmon_regs[smp_processor_id()] = excp;
      xmon_enter();
      excprint(excp);
#ifdef CONFIG_SMP
      if (test_and_set_bit(smp_processor_id(), &cpus_in_xmon))
            for (;;)
                  ;
      while (test_and_set_bit(0, &got_xmon)) {
            if (take_xmon == smp_processor_id()) {
                  take_xmon = -1;
                  break;
            }
      }
      /*
       * XXX: breakpoints are removed while any cpu is in xmon
       */
#endif /* CONFIG_SMP */
      remove_bpts();
      cmd = cmds(excp);
      if (cmd == 's') {
            xmon_trace[smp_processor_id()] = SSTEP;
            xmon_enable_sstep(excp);
      } else if (at_breakpoint(excp->nip)) {
            xmon_trace[smp_processor_id()] = BRSTEP;
            xmon_enable_sstep(excp);
      } else {
            xmon_trace[smp_processor_id()] = 0;
            insert_bpts();
      }
      xmon_leave();
      xmon_regs[smp_processor_id()] = NULL;
#ifdef CONFIG_SMP
      clear_bit(0, &got_xmon);
      clear_bit(smp_processor_id(), &cpus_in_xmon);
#endif /* CONFIG_SMP */
      set_msr(msr);           /* restore interrupt enable */
      get_tb(start_tb[smp_processor_id()]);

      return cmd != 'X';
}

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;

      bp = at_breakpoint(regs->nip);
      if (!bp)
            return 0;
      if (bp->count) {
            --bp->count;
            remove_bpts();
            excprint(regs);
            xmon_trace[smp_processor_id()] = BRSTEP;
            xmon_enable_sstep(regs);
      } else {
            xmon(regs);
      }
      return 1;
}

int
xmon_sstep(struct pt_regs *regs)
{
      if (!xmon_trace[smp_processor_id()])
            return 0;
      if (xmon_trace[smp_processor_id()] == BRSTEP) {
            xmon_trace[smp_processor_id()] = 0;
            insert_bpts();
      } else {
            xmon(regs);
      }
      return 1;
}

int
xmon_dabr_match(struct pt_regs *regs)
{
      if (dabr.enabled && dabr.count) {
            --dabr.count;
            remove_bpts();
            excprint(regs);
            xmon_trace[smp_processor_id()] = BRSTEP;
            regs->msr |= 0x400;
      } else {
            dabr.instr = regs->nip;
            xmon(regs);
      }
      return 1;
}

int
xmon_iabr_match(struct pt_regs *regs)
{
      if (iabr.enabled && iabr.count) {
            --iabr.count;
            remove_bpts();
            excprint(regs);
            xmon_trace[smp_processor_id()] = BRSTEP;
            regs->msr |= 0x400;
      } else {
            xmon(regs);
      }
      return 1;
}

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

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

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

      bp = bpts;
      for (i = 0; i < NBPTS; ++i, ++bp) {
            if (!bp->enabled)
                  continue;
            if (mread(bp->address, &bp->instr, 4) != 4
                || mwrite(bp->address, &bpinstr, 4) != 4) {
                  printf("Couldn't insert breakpoint at %x, disabling\n",
                         bp->address);
                  bp->enabled = 0;
            }
            store_inst((void *) bp->address);
      }
#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
      if (dabr.enabled)
            set_dabr(dabr.address);
      if (iabr.enabled)
            set_iabr(iabr.address);
#endif
}

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

#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
      set_dabr(0);
      set_iabr(0);
#endif
      bp = bpts;
      for (i = 0; i < NBPTS; ++i, ++bp) {
            if (!bp->enabled)
                  continue;
            if (mread(bp->address, &instr, 4) == 4
                && instr == bpinstr
                && mwrite(bp->address, &bp->instr, 4) != 4)
                  printf("Couldn't remove breakpoint at %x\n",
                         bp->address);
            store_inst((void *) bp->address);
      }
}

static char *last_cmd;

/* Command interpreting routine */
static int
cmds(struct pt_regs *excp)
{
      int cmd;

      last_cmd = NULL;
      for(;;) {
#ifdef CONFIG_SMP
            printf("%d:", smp_processor_id());
#endif /* CONFIG_SMP */
            printf("mon> ");
            fflush(stdout);
            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;
                  default:
                        termch = cmd;
                        memex();
                  }
                  break;
            case 'd':
                  dump();
                  break;
            case 'l':
                  symbol_lookup();
                  break;
            case 'r':
                  if (excp != NULL)
                        prregs(excp);     /* print regs */
                  break;
            case 'e':
                  if (excp == NULL)
                        printf("No exception information\n");
                  else
                        excprint(excp);
                  break;
            case 'S':
                  super_regs();
                  break;
            case 't':
                  backtrace(excp);
                  break;
            case 'f':
                  cacheflush();
                  break;
            case 'h':
                  dump_hash_table();
                  break;
            case 's':
            case 'x':
            case EOF:
                  return cmd;
            case '?':
                  printf(help_string);
                  break;
            default:
                  printf("Unrecognized command: ");
                  if( ' ' < cmd && cmd <= '~' )
                        putchar(cmd);
                  else
                        printf("\\x%x", cmd);
                  printf(" (type ? for help)\n");
                  break;
            case 'b':
                  bpt_cmds();
                  break;
            case 'C':
                  csum();
                  break;
#ifdef CONFIG_SMP
            case 'c':
                  cpu_cmd();
                  break;
#endif /* CONFIG_SMP */
            case 'z':
                  bootcmds();
                  break;
            case 'p':
                  proccall();
                  break;
            case 'T':
                  printtime();
                  break;
            }
      }
}

extern unsigned tb_to_us;

#define mulhwu(x,y) \
({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})

static void printtime(void)
{
      unsigned int delta;

      delta = stop_tb[smp_processor_id()][1]
            - start_tb[smp_processor_id()][1];
      delta = mulhwu(tb_to_us, delta);
      printf("%u.%06u seconds\n", delta / 1000000, delta % 1000000);
}

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();
}

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

      cmd = inchar();
      if (cmd == 'i') {
            /* interrupt other cpu(s) */
            cpu = MSG_ALL_BUT_SELF;
            if (scanhex(&cpu))
                  smp_send_xmon_break(cpu);
            return;
      }
      termch = cmd;
      if (!scanhex(&cpu)) {
            /* print cpus waiting or in xmon */
            printf("cpus stopped:");
            for (cpu = 0; cpu < NR_CPUS; ++cpu) {
                  if (test_bit(cpu, &cpus_in_xmon)) {
                        printf(" %d", cpu);
                        if (cpu == smp_processor_id())
                              printf("*", cpu);
                  }
            }
            printf("\n");
            return;
      }
      /* try to switch to cpu specified */
      take_xmon = cpu;
      timeout = 10000000;
      while (take_xmon >= 0) {
            if (--timeout == 0) {
                  /* yes there's a race here */
                  take_xmon = -1;
                  printf("cpu %u didn't take control\n", cpu);
                  return;
            }
      }
      /* now have to wait to be given control back */
      while (test_and_set_bit(0, &got_xmon)) {
            if (take_xmon == smp_processor_id()) {
                  take_xmon = -1;
                  break;
            }
      }
}
#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);
}

static void
bpt_cmds(void)
{
      int cmd;
      unsigned a;
      int mode, i;
      struct bpt *bp;

      cmd = inchar();
      switch (cmd) {
#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
      case 'd':
            mode = 7;
            cmd = inchar();
            if (cmd == 'r')
                  mode = 5;
            else if (cmd == 'w')
                  mode = 6;
            else
                  termch = cmd;
            cmd = inchar();
            if (cmd == 'p')
                  mode &= ~4;
            else
                  termch = cmd;
            dabr.address = 0;
            dabr.count = 0;
            dabr.enabled = scanhex(&dabr.address);
            scanhex(&dabr.count);
            if (dabr.enabled)
                  dabr.address = (dabr.address & ~7) | mode;
            break;
      case 'i':
            cmd = inchar();
            if (cmd == 'p')
                  mode = 2;
            else
                  mode = 3;
            iabr.address = 0;
            iabr.count = 0;
            iabr.enabled = scanhex(&iabr.address);
            if (iabr.enabled)
                  iabr.address |= mode;
            scanhex(&iabr.count);
            break;
#endif
      case 'c':
            if (!scanhex(&a)) {
                  /* clear all breakpoints */
                  for (i = 0; i < NBPTS; ++i)
                        bpts[i].enabled = 0;
                  iabr.enabled = 0;
                  dabr.enabled = 0;
                  printf("All breakpoints cleared\n");
            } else {
                  bp = at_breakpoint(a);
                  if (bp == 0) {
                        printf("No breakpoint at %x\n", a);
                  } else {
                        bp->enabled = 0;
                  }
            }
            break;
      default:
            termch = cmd;
            if (!scanhex(&a)) {
                  /* print all breakpoints */
                  printf("type  address   count\n");
                  if (dabr.enabled) {
                        printf("data %.8x %8x [", dabr.address & ~7,
                               dabr.count);
                        if (dabr.address & 1)
                              printf("r");
                        if (dabr.address & 2)
                              printf("w");
                        if (!(dabr.address & 4))
                              printf("p");
                        printf("]\n");
                  }
                  if (iabr.enabled)
                        printf("inst %.8x %8x\n", iabr.address & ~3,
                               iabr.count);
                  for (bp = bpts; bp < &bpts[NBPTS]; ++bp)
                        if (bp->enabled)
                              printf("trap %.8x %8x\n", bp->address,
                                     bp->count);
                  break;
            }
            bp = at_breakpoint(a);
            if (bp == 0) {
                  for (bp = bpts; bp < &bpts[NBPTS]; ++bp)
                        if (!bp->enabled)
                              break;
                  if (bp >= &bpts[NBPTS]) {
                        printf("Sorry, no free breakpoints\n");
                        break;
                  }
            }
            bp->enabled = 1;
            bp->address = a;
            bp->count = 0;
            scanhex(&bp->count);
            break;
      }
}

static void
backtrace(struct pt_regs *excp)
{
      unsigned sp;
      unsigned stack[2];
      struct pt_regs regs;
      extern char ret_from_except, ret_from_except_full, ret_from_syscall;

      printf("backtrace:\n");
      
      if (excp != NULL)
            sp = excp->gpr[1];
      else
            sp = getsp();
      scanhex(&sp);
      scannl();
      for (; sp != 0; sp = stack[0]) {
            if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
                  break;
            printf("[%.8lx] ", stack[0]);
            xmon_print_symbol(stack[1], " ", "\n");
            if (stack[1] == (unsigned) &ret_from_except
                || stack[1] == (unsigned) &ret_from_except_full
                || stack[1] == (unsigned) &ret_from_syscall) {
                  if (mread(sp+16, &regs, sizeof(regs)) != sizeof(regs))
                        break;
                  printf("exception:%x [%x] %x\n", regs.trap, sp+16,
                         regs.nip);
                  sp = regs.gpr[1];
                  if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
                        break;
            }
      }
}

int
getsp(void)
{
    int x;

    asm("mr %0,1" : "=r" (x) :);
    return x;
}

void
excprint(struct pt_regs *fp)
{
      int trap;

#ifdef CONFIG_SMP
      printf("cpu %d: ", smp_processor_id());
#endif /* CONFIG_SMP */
      printf("vector: %x at pc=", fp->trap);
      xmon_print_symbol(fp->nip, ": ", ", lr=");
      xmon_print_symbol(fp->link, ": ", "\n");
      printf("msr = %x, sp = %x [%x]\n", fp->msr, fp->gpr[1], fp);
      trap = TRAP(fp);
      if (trap == 0x300 || trap == 0x600)
            printf("dar = %x, dsisr = %x\n", fp->dar, fp->dsisr);
      if (current)
            printf("current = %x, pid = %d, comm = %s\n",
                   current, current->pid, current->comm);
}

void
prregs(struct pt_regs *fp)
{
      int n;
      unsigned base;

      if (scanhex(&base))
            fp = (struct pt_regs *) base;
      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;
            }
      }
      printf("pc  = %.8x   msr = %.8x   lr  = %.8x   cr  = %.8x\n",
             fp->nip, fp->msr, fp->link, fp->ccr);
      printf("ctr = %.8x   xer = %.8x   trap = %4x\n",
             fp->ctr, fp->xer, fp->trap);
}

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

      cmd = inchar();
      if (cmd != 'i')
            termch = cmd;
      scanhex(&adrs);
      if (termch != '\n')
            termch = 0;
      nflush = 1;
      scanhex(&nflush);
      nflush = (nflush + 31) / 32;
      if (cmd != 'i') {
            for (; nflush > 0; --nflush, adrs += 0x20)
                  cflush((void *) adrs);
      } else {
            for (; nflush > 0; --nflush, adrs += 0x20)
                  cinval((void *) adrs);
      }
}

unsigned int
read_spr(int n)
{
    unsigned int instrs[2];
    int (*code)(void);

    instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
    instrs[1] = 0x4e800020;
    store_inst(instrs);
    store_inst(instrs+1);
    code = (int (*)(void)) instrs;
    return code();
}

void
write_spr(int n, unsigned int val)
{
    unsigned int instrs[2];
    int (*code)(unsigned int);

    instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
    instrs[1] = 0x4e800020;
    store_inst(instrs);
    store_inst(instrs+1);
    code = (int (*)(unsigned int)) instrs;
    code(val);
}

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

void
super_regs(void)
{
      int i, cmd;
      unsigned val;

      cmd = skipbl();
      if (cmd == '\n') {
            printf("msr = %x, pvr = %x\n", get_msr(), get_pvr());
            printf("sprg0-3 = %x %x %x %x\n", get_sprg0(), get_sprg1(),
                   get_sprg2(), get_sprg3());
            printf("srr0 = %x, srr1 = %x\n", get_srr0(), get_srr1());
#ifdef CONFIG_PPC_STD_MMU
            printf("sr0-15 =");
            for (i = 0; i < 16; ++i)
                  printf(" %x", get_sr(i));
            printf("\n");
#endif
            asm("mr %0,1" : "=r" (i) :);
            printf("sp = %x ", i);
            asm("mr %0,2" : "=r" (i) :);
            printf("toc = %x\n", i);
            return;
      }

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

#ifndef CONFIG_PPC_STD_MMU
static void
dump_hash_table(void)
{
      printf("This CPU doesn't have a hash table.\n");
}
#else

static void
dump_hash_table_seg(unsigned seg, unsigned start, unsigned end)
{
      extern void *Hash;
      extern unsigned long Hash_size;
      unsigned *htab = Hash;
      unsigned hsize = Hash_size;
      unsigned v, hmask, va, last_va = 0;
      int found, last_found, i;
      unsigned *hg, w1, last_w2 = 0, last_va0 = 0;

      last_found = 0;
      hmask = hsize / 64 - 1;
      va = start;
      start = (start >> 12) & 0xffff;
      end = (end >> 12) & 0xffff;
      for (v = start; v < end; ++v) {
            found = 0;
            hg = htab + (((v ^ seg) & hmask) * 16);
            w1 = 0x80000000 | (seg << 7) | (v >> 10);
            for (i = 0; i < 8; ++i, hg += 2) {
                  if (*hg == w1) {
                        found = 1;
                        break;
                  }
            }
            if (!found) {
                  w1 ^= 0x40;
                  hg = htab + ((~(v ^ seg) & hmask) * 16);
                  for (i = 0; i < 8; ++i, hg += 2) {
                        if (*hg == w1) {
                              found = 1;
                              break;
                        }
                  }
            }
            if (!(last_found && found && (hg[1] & ~0x180) == last_w2 + 4096)) {
                  if (last_found) {
                        if (last_va != last_va0)
                              printf(" ... %x", last_va);
                        printf("\n");
                  }
                  if (found) {
                        printf("%x to %x", va, hg[1]);
                        last_va0 = va;
                  }
                  last_found = found;
            }
            if (found) {
                  last_w2 = hg[1] & ~0x180;
                  last_va = va;
            }
            va += 4096;
      }
      if (last_found)
            printf(" ... %x\n", last_va);
}

static unsigned hash_ctx;
static unsigned hash_start;
static unsigned hash_end;

static void
dump_hash_table(void)
{
      int seg;
      unsigned seg_start, seg_end;

      hash_ctx = 0;
      hash_start = 0;
      hash_end = 0xfffff000;
      scanhex(&hash_ctx);
      scanhex(&hash_start);
      scanhex(&hash_end);
      printf("Mappings for context %x\n", hash_ctx);
      seg_start = hash_start;
      for (seg = hash_start >> 28; seg <= hash_end >> 28; ++seg) {
            seg_end = (seg << 28) | 0x0ffff000;
            if (seg_end > hash_end)
                  seg_end = hash_end;
            dump_hash_table_seg((hash_ctx << 4) + (seg * 0x111),
                            seg_start, seg_end);
            seg_start = seg_end + 0x1000;
      }
}
#endif /* CONFIG_PPC_STD_MMU */

/*
 * Stuff for reading and writing memory safely
 */

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

      n = 0;
      if( setjmp(bus_error_jmp) == 0 ){
            debugger_fault_handler = handle_fault;
            sync();
            p = (char *) adrs;
            q = (char *) buf;
            switch (size) {
            case 2: *(short *)q = *(short *)p;  break;
            case 4: *(int *)q = *(int *)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;
      }
      debugger_fault_handler = NULL;
      return n;
}

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

      n = 0;
      if( setjmp(bus_error_jmp) == 0 ){
            debugger_fault_handler = handle_fault;
            sync();
            p = (char *) adrs;
            q = (char *) buf;
            switch (size) {
            case 2: *(short *)p = *(short *)q;  break;
            case 4: *(int *)p = *(int *)q;            break;
            default:
                  for( ; n < size; ++n ) {
                        *p++ = *q++;
                        sync();
                  }
            }
            sync();
            n = size;
      } else {
            printf("*** Error writing address %x\n", adrs + n);
      }
      debugger_fault_handler = NULL;
      return n;
}

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

static void
handle_fault(struct pt_regs *regs)
{
      fault_except = TRAP(regs);
      fault_type = TRAP(regs) == 0x200? 0: TRAP(regs) == 0x300? 1: 2;
      longjmp(bus_error_jmp, 1);
}

#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;
      }
}

static int brev;
static int mnoread;

void
memex(void)
{
    int cmd, inc, i, nslash;
    unsigned n;
    unsigned char val[4];

    last_cmd = "m\n";
    scanhex(&adrs);
    while ((cmd = skipbl()) != '\n') {
      switch( cmd ){
      case 'b':   size = 1;   break;
      case 'w':   size = 2;   break;
      case 'l':   size = 4;   break;
      case 'r':   brev = !brev;     break;
      case 'n':   mnoread = 1;      break;
      case '.':   mnoread = 0;      break;
      }
    }
    if( size <= 0 )
      size = 1;
    else if( size > 4 )
      size = 4;
    for(;;){
      if (!mnoread)
          n = mread(adrs, val, size);
      printf("%.8x%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 '^':
            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(&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;
          }
      }
      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;
}

void
dump(void)
{
      int c;

      c = inchar();
      if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n')
            termch = c;
      scanhex(&adrs);
      if( termch != '\n')
            termch = 0;
      if( c == 'i' ){
            scanhex(&nidump);
            if( nidump == 0 )
                  nidump = 16;
            adrs += ppc_inst_dump(adrs, nidump);
            last_cmd = "di\n";
      } else {
            scanhex(&ndump);
            if( ndump == 0 )
                  ndump = 64;
            prdump(adrs, ndump);
            adrs += ndump;
            last_cmd = "d\n";
      }
}

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

      for( n = ndump; n > 0; ){
            printf("%.8x", adrs);
            putchar(' ');
            r = n < 16? n: 16;
            nr = mread(adrs, temp, r);
            adrs += nr;
            for( m = 0; m < r; ++m ){
                  putchar((m & 3) == 0 && m > 0? '.': ' ');
                  if( m < nr )
                        printf("%.2x", temp[m]);
                  else
                        printf("%s", fault_chars[fault_type]);
            }
            for(; m < 16; ++m )
                  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 adr, int count)
{
      int nr, dotted;
      unsigned 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 ){
                  const char *x = fault_chars[fault_type];
                  printf("%.8x  %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;
            printf("%.8x  ", adr);
            printf("%.8x\t", inst);
            print_insn_big_powerpc(stdout, inst, adr);      /* always returns 4 */
            printf("\n");
      }
      return adr - first_adr;
}

void
print_address(unsigned addr)
{
      printf("0x%x", addr);
}

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

void
memops(int cmd)
{
      scanhex(&mdest);
      if( termch != '\n' )
            termch = 0;
      scanhex(cmd == 's'? &mval: &msrc);
      if( termch != '\n' )
            termch = 0;
      scanhex(&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(&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("%.8x %.2x # %.8x %.2x\n", (unsigned)p1 - 1,
                              p1[-1], (unsigned)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(&mdest);
      if (termch != '\n') {
            termch = 0;
            scanhex(&mend);
            if (termch != '\n') {
                  termch = 0;
                  scanhex(&mval);
                  mask = ~0;
                  if (termch != '\n') termch = 0;
                  scanhex(&mask);
            }
      }
      n = 0;
      for (a = mdest; a < mend; a += 4) {
            if (mread(a, val, 4) == 4
                  && ((GETWORD(val) ^ mval) & mask) == 0) {
                  printf("%.8x:  %.8x\n", a, GETWORD(val));
                  if (++n >= 10)
                        break;
            }
      }
}

static unsigned mskip = 0x1000;
static unsigned 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);
                  fflush(stdout);
            } 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 int args[8];
      unsigned int ret;
      int i;
      typedef unsigned int (*callfunc_t)(unsigned int, unsigned int,
                  unsigned int, unsigned int, unsigned int,
                  unsigned int, unsigned int, unsigned int);
      callfunc_t func;

      scanhex(&adrs);
      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) {
            debugger_fault_handler = handle_fault;
            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);
      }
      debugger_fault_handler = NULL;
}

/* 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", "mq",
      "trap", "dar", "dsisr", "res"
};

int
scanhex(unsigned *vp)
{
      int c, d;
      unsigned 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) {
                        unsigned *rp = (unsigned *)
                              xmon_regs[smp_processor_id()];
                        if (rp == NULL) {
                              printf("regs not available\n");
                              return 0;
                        }
                        *vp = rp[i];
                        return 1;
                  }
            }
            printf("invalid register name '%%%s'\n", regname);
            return 0;
      } else if (c == '$') {
            static char symname[128];
            int i;
            for (i=0; i<63; i++) {
                  c = inchar();
                  if (isspace(c)) {
                        termch = c;
                        break;
                  }
                  symname[i] = c;
            }
            symname[i++] = 0;
            *vp = 0;
            if (setjmp(bus_error_jmp) == 0) {
                  debugger_fault_handler = handle_fault;
                  sync();
                  *vp = kallsyms_lookup_name(symname);
                  sync();
            }
            debugger_fault_handler = NULL;
            if (!(*vp)) {
                  printf("unknown symbol\n");
                  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 (fgets(line, sizeof(line), stdin) == 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 addr;
      static char tmp[128];

      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) {
                  debugger_fault_handler = handle_fault;
                  sync();
                  addr = kallsyms_lookup_name(tmp);
                  if (addr)
                        printf("%s: %lx\n", tmp, addr);
                  else
                        printf("Symbol '%s' not found.\n", tmp);
                  sync();
            }
            debugger_fault_handler = NULL;
            termch = 0;
            break;
      }
}


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