Add ARM support

libgloss/arm/redboot-syscalls.c

@@ -0,0 +1,203 @@
+/*
+ * redboot-syscalls.c -- provide system call support for RedBoot
+ *
+ * Copyright (c) 1997, 2001 Cygnus Support
+ *
+ * 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 <stdlib.h>
+#include <sys/stat.h>
+#include <sys/times.h>
+#include <errno.h>
+#include "syscall.h"
+
+// Use "naked" attribute to suppress C prologue/epilogue
+static int __attribute__ ((naked)) __syscall(int func_no, ...)
+{
+    asm ("mov	r12, lr\n");
+#ifdef __thumb__
+    asm ("swi 0x18\n");
+#else
+    asm ("swi 0x180001\n");
+#endif
+    asm ("mov	pc, r12\n");
+}
+
+int
+_close(int fd)
+{
+    int  err;
+    err = __syscall(SYS_close, fd);
+    if (err)
+	errno = err;
+    return err;
+}
+
+
+void
+_exit(int stat)
+{
+    while (1)
+        __syscall(SYS_exit, stat);
+}
+
+
+int
+_fstat (int file, struct stat *st)
+{
+    st->st_mode = S_IFCHR;
+    st->st_blksize = 4096;
+    return 0;
+}
+
+int
+_getpid(void)
+{
+    return 1;
+}
+
+
+int
+_gettimeofday (void * tp, void * tzp)
+{
+    return 0;
+}
+
+
+int
+isatty(int fd)
+{
+    return (1);
+}
+
+
+int
+_kill(int pid, int sig)
+{
+  if(pid == 1)
+    _exit(sig);
+  return 0;
+}
+
+
+off_t
+_lseek(int fd, off_t offset, int whence)
+{
+    int err;
+    err = __syscall(SYS_lseek, fd, offset, whence);
+    if (err)
+	errno = err;
+    return err;
+}
+
+
+int
+_open(const char *buf, int flags, int mode)
+{
+    int err ;
+    err = __syscall(SYS_open, buf, flags, mode);
+    if (err)
+	errno = err;
+    return err;
+}
+
+
+int
+_write(int fd, const char *buf, int nbytes)
+{
+    int err;
+
+    err = __syscall(SYS_write, fd, buf, nbytes);
+    if (err)
+	errno = err;
+    return err;
+}
+
+
+void
+print(char *ptr)
+{
+  char *p = ptr;
+
+  while (*p != '\0')
+    p++;
+
+  _write (1, ptr, p-ptr);
+}
+
+void
+_raise (void)
+{
+    return;
+}
+
+
+int
+_read(int fd, char *buf, int nbytes)
+{
+    int err;
+    err = __syscall(SYS_read, fd, buf, nbytes);
+    if (err)
+	errno = err;
+    return err;
+}
+
+
+extern char end[];                /* end is set in the linker command file */
+
+char *heap_ptr;
+
+char *
+_sbrk (int nbytes)
+{
+    char        *base;
+
+    if (!heap_ptr)
+	heap_ptr = (char *)&end;
+    base = heap_ptr;
+    heap_ptr += nbytes;
+
+    return base;
+}
+
+
+clock_t
+_times(struct tms * tp)
+{
+    clock_t utime;
+#ifdef HAVE_BSP_CLOCK
+    int err;
+    err = __syscall(SYS_utime, &utime);
+    if (err)
+	utime = 0;
+#else
+    utime = 0;
+#endif
+
+    if (tp) {
+	tp->tms_utime = utime;
+	tp->tms_stime = 0;
+	tp->tms_cutime = 0;
+	tp->tms_cstime = 0;
+    }
+
+    return utime;
+}
+
+
+int
+_unlink (const char *pathname)
+{
+  return -1;
+}
+