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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) */
}
}
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