microblaze: Implement include/asm/syscall.h.

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

1 files changed, 99 insertions, 0 deletions

diff --git a/arch/microblaze/include/asm/syscall.h b/arch/microblaze/include/asm/syscall.h
new file mode 100644
index 000000000000..048dfcd8d89d
--- /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 */