linux_kernel/arch/parisc/include/asm/syscall.h

/* syscall.h */

#ifndef _ASM_PARISC_SYSCALL_H_
#define _ASM_PARISC_SYSCALL_H_

#include <uapi/linux/audit.h>
#include <linux/compat.h>
#include <linux/err.h>
#include <asm/ptrace.h>

static inline long syscall_get_nr(struct task_struct *tsk,
				  struct pt_regs *regs)
{
	return regs->gr[20];
}

static inline void syscall_get_arguments(struct task_struct *tsk,
					 struct pt_regs *regs, unsigned int i,
					 unsigned int n, unsigned long *args)
{
	BUG_ON(i);

	switch (n) {
	case 6:
		args[5] = regs->gr[21];
	case 5:
		args[4] = regs->gr[22];
	case 4:
		args[3] = regs->gr[23];
	case 3:
		args[2] = regs->gr[24];
	case 2:
		args[1] = regs->gr[25];
	case 1:
		args[0] = regs->gr[26];
		break;
	default:
		BUG();
	}
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->gr[28] = error ? error : val;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	/* do nothing */
}

static inline int syscall_get_arch(void)
{
	int arch = AUDIT_ARCH_PARISC;
#ifdef CONFIG_64BIT
	if (!is_compat_task())
		arch = AUDIT_ARCH_PARISC64;
#endif
	return arch;
}
#endif /*_ASM_PARISC_SYSCALL_H_*/