MN10300: Implement asm/syscall.h

Implement asm/syscall.h for the MN10300 arch.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/mn10300/include/asm/syscall.h b/arch/mn10300/include/asm/syscall.h
new file mode 100644 (file)
index 0000000..b44b0bb
--- /dev/null
+++ b/arch/mn10300/include/asm/syscall.h
@@ -0,0 +1,117 @@
+/* Access to user system call parameters and results
+ *
+ * See asm-generic/syscall.h for function descriptions.
+ *
+ * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _ASM_SYSCALL_H
+#define _ASM_SYSCALL_H
+
+#include <linux/sched.h>
+#include <linux/err.h>
+
+extern const unsigned long sys_call_table[];
+
+static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
+{
+       return regs->orig_d0;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+                                   struct pt_regs *regs)
+{
+       regs->d0 = regs->orig_d0;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+       unsigned long error = regs->d0;
+       return IS_ERR_VALUE(error) ? error : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                           struct pt_regs *regs)
+{
+       return regs->d0;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                           struct pt_regs *regs,
+                                           int error, long val)
+{
+       regs->d0 = (long) error ?: val;
+}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        unsigned long *args)
+{
+       switch (i) {
+       case 0:
+               if (!n--) break;
+               *args++ = regs->a0;
+       case 1:
+               if (!n--) break;
+               *args++ = regs->d1;
+       case 2:
+               if (!n--) break;
+               *args++ = regs->a3;
+       case 3:
+               if (!n--) break;
+               *args++ = regs->a2;
+       case 4:
+               if (!n--) break;
+               *args++ = regs->d3;
+       case 5:
+               if (!n--) break;
+               *args++ = regs->d2;
+       case 6:
+               if (!n--) break;
+       default:
+               BUG();
+               break;
+       }
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        const unsigned long *args)
+{
+       switch (i) {
+       case 0:
+               if (!n--) break;
+               regs->a0 = *args++;
+       case 1:
+               if (!n--) break;
+               regs->d1 = *args++;
+       case 2:
+               if (!n--) break;
+               regs->a3 = *args++;
+       case 3:
+               if (!n--) break;
+               regs->a2 = *args++;
+       case 4:
+               if (!n--) break;
+               regs->d3 = *args++;
+       case 5:
+               if (!n--) break;
+               regs->d2 = *args++;
+       case 6:
+               if (!n--) break;
+       default:
+               BUG();
+               break;
+       }
+}
+
+#endif /* _ASM_SYSCALL_H */