MIPS: Implement remaining <asm/syscall.h> APIs.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 03484fda20f430fdc0ef87b4e39e0ee1c74552b9..b80936d7756e510b51df8bd4f86ab94c35c97f9b 100644 (file)
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -33,6 +33,12 @@ static inline void syscall_rollback(struct task_struct *task,
        regs->regs[2] = regs->regs[0];
 }
 
+static inline long syscall_get_error(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+       return regs->regs[7] ? regs->regs[2] : 0;
+}
+
 static inline long syscall_get_return_value(struct task_struct *task,
                                            struct pt_regs *regs)
 {
@@ -85,6 +91,36 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
        }
 }
 
+static inline int mips_set_syscall_arg(struct task_struct *task,
+       struct pt_regs *regs, unsigned int n, unsigned long val)
+{
+       unsigned long usp = regs->regs[29];
+
+       switch (n) {
+       case 0: case 1: case 2: case 3:
+
+#ifdef CONFIG_32BIT
+       case 4: case 5: case 6: case 7:
+               return put_user(val, (long *)usp + (4 * n));
+#endif
+
+#ifdef CONFIG_64BIT
+       case 4: case 5: case 6: case 7:
+#ifdef CONFIG_MIPS32_O32
+               if (test_thread_flag(TIF_32BIT_REGS))
+                       return put_user(val, (long *)usp + (4 * n));
+               else
+#endif
+                       regs->regs[4 + n] = val;
+
+               return 0;
+#endif
+
+       default:
+               BUG();
+       }
+}
+
 static inline void syscall_get_arguments(struct task_struct *task,
                                         struct pt_regs *regs,
                                         unsigned int i, unsigned int n,
@@ -104,6 +140,24 @@ static inline void syscall_get_arguments(struct task_struct *task,
 #endif
 }
 
+static inline void syscall_set_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        const unsigned long *args)
+{
+       int ret;
+
+       while (n--)
+               ret |= mips_set_syscall_arg(task, regs, i++, *args++);
+
+       /*
+        * No way to communicate an error because this is a void function.
+        */
+#if 0
+       return ret;
+#endif
+}
+
 extern const unsigned long sys_call_table[];
 extern const unsigned long sys32_call_table[];
 extern const unsigned long sysn32_call_table[];