118 lines
2.4 KiB
C
118 lines
2.4 KiB
C
/* Access to user system call parameters and results
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*
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* See asm-generic/syscall.h for function descriptions.
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*
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* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_SYSCALL_H
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#define _ASM_SYSCALL_H
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#include <linux/sched.h>
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#include <linux/err.h>
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extern const unsigned long sys_call_table[];
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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{
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return regs->orig_d0;
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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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regs->d0 = regs->orig_d0;
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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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unsigned long error = regs->d0;
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return IS_ERR_VALUE(error) ? error : 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->d0;
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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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regs->d0 = (long) error ?: val;
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}
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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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switch (i) {
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case 0:
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if (!n--) break;
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*args++ = regs->a0;
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case 1:
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if (!n--) break;
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*args++ = regs->d1;
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case 2:
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if (!n--) break;
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*args++ = regs->a3;
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case 3:
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if (!n--) break;
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*args++ = regs->a2;
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case 4:
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if (!n--) break;
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*args++ = regs->d3;
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case 5:
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if (!n--) break;
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*args++ = regs->d2;
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case 6:
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if (!n--) break;
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default:
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BUG();
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break;
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}
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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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const unsigned long *args)
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{
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switch (i) {
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case 0:
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if (!n--) break;
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regs->a0 = *args++;
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case 1:
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if (!n--) break;
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regs->d1 = *args++;
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case 2:
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if (!n--) break;
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regs->a3 = *args++;
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case 3:
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if (!n--) break;
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regs->a2 = *args++;
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case 4:
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if (!n--) break;
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regs->d3 = *args++;
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case 5:
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if (!n--) break;
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regs->d2 = *args++;
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case 6:
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if (!n--) break;
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default:
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BUG();
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break;
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}
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}
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#endif /* _ASM_SYSCALL_H */
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