microblaze: Implement include/asm/syscall.h.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

diff --git a/arch/microblaze/include/asm/syscall.h b/arch/microblaze/include/asm/syscall.h
new file mode 100644 (file)
index 0000000..048dfcd
--- /dev/null
+++ b/arch/microblaze/include/asm/syscall.h
@@ -0,0 +1,99 @@
+#ifndef __ASM_MICROBLAZE_SYSCALL_H
+#define __ASM_MICROBLAZE_SYSCALL_H
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/ptrace.h>
+
+/* The system call number is given by the user in R12 */
+static inline long syscall_get_nr(struct task_struct *task,
+                                 struct pt_regs *regs)
+{
+       return regs->r12;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+                                   struct pt_regs *regs)
+{
+       /* TODO.  */
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+       return IS_ERR_VALUE(regs->r3) ? regs->r3 : 0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                           struct pt_regs *regs)
+{
+       return regs->r3;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                           struct pt_regs *regs,
+                                           int error, long val)
+{
+       if (error)
+               regs->r3 = -error;
+       else
+               regs->r3 = val;
+}
+
+static inline microblaze_reg_t microblaze_get_syscall_arg(struct pt_regs *regs,
+                                                         unsigned int n)
+{
+       switch (n) {
+       case 5: return regs->r10;
+       case 4: return regs->r9;
+       case 3: return regs->r8;
+       case 2: return regs->r7;
+       case 1: return regs->r6;
+       case 0: return regs->r5;
+       default:
+               BUG();
+       }
+       return ~0;
+}
+
+static inline void microblaze_set_syscall_arg(struct pt_regs *regs,
+                                             unsigned int n,
+                                             unsigned long val)
+{
+       switch (n) {
+       case 5:
+               regs->r10 = val;
+       case 4:
+               regs->r9 = val;
+       case 3:
+               regs->r8 = val;
+       case 2:
+               regs->r7 = val;
+       case 1:
+               regs->r6 = val;
+       case 0:
+               regs->r5 = val;
+       default:
+               BUG();
+       }
+}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        unsigned long *args)
+{
+       while (n--)
+               *args++ = microblaze_get_syscall_arg(regs, i++);
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                        struct pt_regs *regs,
+                                        unsigned int i, unsigned int n,
+                                        const unsigned long *args)
+{
+       while (n--)
+               microblaze_set_syscall_arg(regs, i++, *args++);
+}
+
+#endif /* __ASM_MICROBLAZE_SYSCALL_H */