Boot, UART working

syscalls.c

@@ -0,0 +1,190 @@
+/* Support files for GNU libc.  Files in the system namespace go here.
+   Files in the C namespace (ie those that do not start with an
+   underscore) go in .c.  */
+
+#include <_ansi.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/errno.h>
+#include <reent.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+
+#define FreeRTOS
+#define MAX_STACK_SIZE 0x200
+
+extern int __io_putchar(int ch) __attribute__((weak));
+extern int __io_getchar(void) __attribute__((weak));
+
+#ifndef FreeRTOS
+  register char * stack_ptr asm("sp");
+#endif
+
+
+
+
+caddr_t _sbrk(int incr)
+{
+	extern char end asm("end");
+	static char *heap_end;
+	char *prev_heap_end,*min_stack_ptr;
+
+	if (heap_end == 0)
+		heap_end = &end;
+
+	prev_heap_end = heap_end;
+
+#ifdef FreeRTOS
+	/* Use the NVIC offset register to locate the main stack pointer. */
+	min_stack_ptr = (char*)(*(unsigned int *)*(unsigned int *)0xE000ED08);
+	/* Locate the STACK bottom address */
+	min_stack_ptr -= MAX_STACK_SIZE;
+
+	if (heap_end + incr > min_stack_ptr)
+#else
+	if (heap_end + incr > stack_ptr)
+#endif
+	{
+//		write(1, "Heap and stack collision\n", 25);
+//		abort();
+		errno = ENOMEM;
+		return (caddr_t) -1;
+	}
+
+	heap_end += incr;
+
+	return (caddr_t) prev_heap_end;
+}
+
+/*
+ * _gettimeofday primitive (Stub function)
+ * */
+int _gettimeofday (struct timeval * tp, struct timezone * tzp)
+{
+  /* Return fixed data for the timezone.  */
+  if (tzp)
+    {
+      tzp->tz_minuteswest = 0;
+      tzp->tz_dsttime = 0;
+    }
+
+  return 0;
+}
+void initialise_monitor_handles()
+{
+}
+
+int _getpid(void)
+{
+	return 1;
+}
+
+int _kill(int pid, int sig)
+{
+	errno = EINVAL;
+	return -1;
+}
+
+void _exit (int status)
+{
+	_kill(status, -1);
+	while (1) {}
+}
+
+int _write(int file, char *ptr, int len)
+{
+	int DataIdx;
+
+		for (DataIdx = 0; DataIdx < len; DataIdx++)
+		{
+		   __io_putchar( *ptr++ );
+		}
+	return len;
+}
+
+int _close(int file)
+{
+	return -1;
+}
+
+int _fstat(int file, struct stat *st)
+{
+	st->st_mode = S_IFCHR;
+	return 0;
+}
+
+int _isatty(int file)
+{
+	return 1;
+}
+
+int _lseek(int file, int ptr, int dir)
+{
+	return 0;
+}
+
+int _read(int file, char *ptr, int len)
+{
+	int DataIdx;
+
+	for (DataIdx = 0; DataIdx < len; DataIdx++)
+	{
+	  *ptr++ = __io_getchar();
+	}
+
+   return len;
+}
+
+int _open(char *path, int flags, ...)
+{
+	/* Pretend like we always fail */
+	return -1;
+}
+
+int _wait(int *status)
+{
+	errno = ECHILD;
+	return -1;
+}
+
+int _unlink(char *name)
+{
+	errno = ENOENT;
+	return -1;
+}
+
+int _times(struct tms *buf)
+{
+	return -1;
+}
+
+int _stat(char *file, struct stat *st)
+{
+	st->st_mode = S_IFCHR;
+	return 0;
+}
+
+int _link(char *old, char *new)
+{
+	errno = EMLINK;
+	return -1;
+}
+
+int _fork(void)
+{
+	errno = EAGAIN;
+	return -1;
+}
+
+int _execve(char *name, char **argv, char **env)
+{
+	errno = ENOMEM;
+	return -1;
+}