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vcs_hook.c

/*
 * Call simulator hook. This is the part running in the
 * simulated program.
 */

#include "vcs_hook.h"
#include <stdarg.h>
#include <arch-v32/hwregs/reg_map.h>
#include <arch-v32/hwregs/intr_vect_defs.h>

#define HOOK_TRIG_ADDR     0xb7000000     /* hook cvlog model reg address */
#define HOOK_MEM_BASE_ADDR 0xa0000000     /* csp4 (shared mem) base addr */

#define HOOK_DATA(offset) ((unsigned *)HOOK_MEM_BASE_ADDR)[offset]
#define VHOOK_DATA(offset) ((volatile unsigned *)HOOK_MEM_BASE_ADDR)[offset]
#define HOOK_TRIG(funcid) \
      do { \
            *((unsigned *) HOOK_TRIG_ADDR) = funcid; \
      } while (0)
#define HOOK_DATA_BYTE(offset) ((unsigned char *)HOOK_MEM_BASE_ADDR)[offset]

int hook_call(unsigned id, unsigned pcnt, ...)
{
      va_list ap;
      unsigned i;
      unsigned ret;
#ifdef USING_SOS
      PREEMPT_OFF_SAVE();
#endif

      /* pass parameters */
      HOOK_DATA(0) = id;

      /* Have to make hook_print_str a special case since we call with a
       * parameter of byte type. Should perhaps be a separate
       * hook_call. */

      if (id == hook_print_str) {
            int i;
            char *str;

            HOOK_DATA(1) = pcnt;

            va_start(ap, pcnt);
            str = (char *)va_arg(ap, unsigned);

            for (i = 0; i != pcnt; i++)
                  HOOK_DATA_BYTE(8 + i) = str[i];

            HOOK_DATA_BYTE(8 + i) = 0;    /* null byte */
      } else {
            va_start(ap, pcnt);
            for (i = 1; i <= pcnt; i++)
                  HOOK_DATA(i) = va_arg(ap, unsigned);
            va_end(ap);
      }

      /* read from mem to make sure data has propagated to memory before
       * trigging */
      ret = *((volatile unsigned *)HOOK_MEM_BASE_ADDR);

      /* trigger hook */
      HOOK_TRIG(id);

      /* wait for call to finish */
      while (VHOOK_DATA(0) > 0) ;

      /* extract return value */

      ret = VHOOK_DATA(1);

#ifdef USING_SOS
      PREEMPT_RESTORE();
#endif
      return ret;
}

unsigned hook_buf(unsigned i)
{
      return (HOOK_DATA(i));
}

void print_str(const char *str)
{
      int i;
      /* find null at end of string */
      for (i = 1; str[i]; i++) ;
      hook_call(hook_print_str, i, str);
}

void CPU_KICK_DOG(void)
{
      (void)hook_call(hook_kick_dog, 0);
}

void CPU_WATCHDOG_TIMEOUT(unsigned t)
{
      (void)hook_call(hook_dog_timeout, 1, t);
}


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