diff options
Diffstat (limited to 'syscalls.c')
| -rw-r--r-- | syscalls.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/syscalls.c b/syscalls.c new file mode 100644 index 0000000..023cac3 --- /dev/null +++ b/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;
+}
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