linux/arch/cris/arch-v32/kernel/vcs_hook.c

// $Id: vcs_hook.c,v 1.2 2003/08/12 12:01:06 starvik Exp $
//
// Call simulator hook. This is the part running in the
// simulated program.
//

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


// ------------------------------------------------------------------ hook_call
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
  *((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;
  for (i=1; str[i]; i++);         /* find null at end of string */
  hook_call(hook_print_str, i, str);
}

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

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