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/* eva_app.c -- Glue code for linking apps to run under GDB debugger control.

 *

 * Copyright (c) 2001 Red Hat, Inc.

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include "glue.h"

typedef void (*write_proc_t)(char *buf, int nbytes);

typedef int  (*read_proc_t)(char *buf, int nbytes);

/* There is no "syscall", so we just call directly into the stub code

   at fixed addresses. */

#define STUB_WRITE(p,n) ((write_proc_t)0x8084)((p),(n))

#define STUB_READ(p,n)  ((read_proc_t)0x8088)((p),(n))

/*

 * print -- do a raw print of a string

 */

void

print(char *ptr)

{

  STUB_WRITE(ptr, strlen(ptr));

}

/*

 * write -- write bytes to the serial port. Ignore fd, since

 *          stdout and stderr are the same. Since we have no filesystem,

 *          open will only return an error.

 */

int

_write (int fd, char *buf, int nbytes)

{

  STUB_WRITE(buf, nbytes);

  return (nbytes);

}

int

_read (int fd, char *buf, int nbytes)

{

  return STUB_READ(buf, nbytes);

}

extern char _end[];

#define HEAP_LIMIT ((char *)0xffff)

void *

_sbrk(int inc)

{

  static char *heap_ptr = _end;

  void *base;

  if (inc > (HEAP_LIMIT - heap_ptr))

    return (void *)-1;

  base = heap_ptr;

  heap_ptr += inc;

  return base;

}

void

_exit(int n)

{

  while (1)

   {

     asm volatile ("nop");

     asm volatile (".hword 0x0006");  /* breakpoint (special illegal insn) */

   }

}