83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
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/*
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* Access to user system call parameters and results
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*
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* Copyright (C) 2008 Intel Corp. Shaohua Li <shaohua.li@intel.com>
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_SYSCALL_H
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#define _ASM_SYSCALL_H 1
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#include <linux/sched.h>
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#include <linux/err.h>
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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if ((long)regs->cr_ifs < 0) /* Not a syscall */
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return -1;
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return regs->r15;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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/* do nothing */
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->r10 == -1 ? regs->r8:0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->r8;
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error) {
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/* error < 0, but ia64 uses > 0 return value */
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regs->r8 = -error;
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regs->r10 = -1;
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} else {
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regs->r8 = val;
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regs->r10 = 0;
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}
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}
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extern void ia64_syscall_get_set_arguments(struct task_struct *task,
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struct pt_regs *regs, unsigned int i, unsigned int n,
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unsigned long *args, int rw);
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
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}
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#endif /* _ASM_SYSCALL_H */
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