microblaze: Implement include/asm/syscall.h.

#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 */