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/* Support */

#include <sys/time.h>

#include "spr_defs.h"

#include "support.h"

#include "int.h"

unsigned long timestamp = 0;

void int_main(void);

/* return value by making a syscall */

void exit (int i)

{

  asm("l.add r3,r0,%0": : "r" (i));

  asm("l.nop %0": :"K" (NOP_EXIT));

  while (1);

}

/* activate printf support in simulator */

void __printf(const char *fmt, ...)

{

  va_list args;

  va_start(args, fmt);

  __asm__ __volatile__ ("  l.addi\tr3,%1,0\n \

                           l.addi\tr4,%2,0\n \

                           l.nop %0": :"K" (NOP_PRINTF), "r" (fmt), "r"  (args) : "r3", "r4");

}

/* print long */

void report(unsigned long value)

{

  asm("l.addi\tr3,%0,0": :"r" (value));

  asm("l.nop %0": :"K" (NOP_REPORT));

}

/* just to satisfy linker */

void __main(void)

{

}

/* For writing into SPR. */

void mtspr(unsigned long spr, unsigned long value)

{

  asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));

}

/* For reading SPR. */

unsigned long mfspr(unsigned long spr)

{

  unsigned long value;

  asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));

  return value;

}

void *memcpy (void *dstv, const void *srcv, unsigned long length)

{

  char *dst = dstv;

  const char *src = (const char *) srcv;

  while (length--)

    *dst++ = *src++;

  return dst;

}

void *memmove (void *dstv, const void *srcv, unsigned long length)

{

  char *dst = dstv;

  const char *src = srcv;

  /* Copy backwards? */

  if (src < dst && dst < src + length) {

    src += length;

    dst += length;

    while (length--) *--dst = *--src;

    return dstv;

        } else return memcpy (dstv, srcv, length);

}

int memcmp (void *dstv, const void *srcv, unsigned long length)

{

  char *dst = dstv;

  const char *src = (const char *) srcv;

  while (length--)

    if(*dst++ != *src++) {

      if(*(--dst) > *(--src))

        return 1;

      else

        return -1;

    }

  return 1;

}

void *memchr (void *dstvoid, const char data, unsigned long length)

{

  char *dst = dstvoid;

  while (length--) *dst++ = data;

  return dst;

}

int strlen (const char *src)

{

  int len = 0;

  while (*src++) len++;

  return len;

}

int strcmp (const char *s1, const char *s2)

{

  while (*s1 != '\0' && *s1 == *s2) {

    s1++;

    s2++;

  }

  return (*(unsigned char *) s1) - (*(unsigned char *) s2);

}

char *strcpy (char *dst0, char *src0)

{

  char *s = dst0;

  while ((*dst0++ = *src0++));

  return s;

}

void reset_timer (void)

{

  timestamp = 0;

}

/* Parses hex or decimal number */

unsigned long strtoul (const char *str, char **endptr, int base)

{

  unsigned long number = 0;

  char *pos = (char *) str;

  char *fail_char = (char *) str;

  while (isspace(*pos)) pos++;  /* skip leading whitespace */

  if ((base == 16) && (*pos == '0')) { /* handle option prefix */

    ++pos;

    fail_char = pos;

    if ((*pos == 'x') || (*pos == 'X')) ++pos;

  }

  if (base == 0) {               /* dynamic base */

    base = 10;          /* default is 10 */

    if (*pos == '0') {

      ++pos;

      base -= 2;                /* now base is 8 (or 16) */

      fail_char = pos;

      if ((*pos == 'x') || (*pos == 'X')) {

        base += 8;      /* base is 16 */

        ++pos;

      }

    }

  }

  if ((base < 2) || (base > 36)) goto done; /* illegal base */

  while (1) {

    int digit = 40;

    if ((*pos >= '0') && (*pos <= '9')) {

        digit = (*pos - '0');

    } else if (*pos >= 'a') {

        digit = (*pos - 'a' + 10);

    } else if (*pos >= 'A') {

        digit = (*pos - 'A' + 10);

    } else break;

    if (digit >= base) break;

    fail_char = ++pos;

    number = number * base + digit;

  }

done:

  if (endptr) *endptr = fail_char;

  return number;

}

unsigned long get_timer (unsigned long base)

{

  return (timestamp - base);

}

void set_timer (unsigned long t)

{

  timestamp = t;

}