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
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 */