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authorFrank Ch. Eigler <fche@elastic.org>2008-04-10 13:36:34 -0400
committerFrank Ch. Eigler <fche@elastic.org>2008-04-10 13:36:34 -0400
commit2881ab63dced89cf57ccf5036eca0a2e6da8a00f (patch)
tree81f0d25ca89ebfaeff32ed01cfd60048dc30d88e /elaborate.h
parente434132f0168145d24cc8f0e6b204020773d561a (diff)
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PR6393: don't bother print build (configure) date any more, with reliable git ids
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generated by cgit (git 2.34.1) at 2025-08-06 09:33:40 +0000
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/*
 * Access to user system call parameters and results
 *
 * Copyright (C) 2008 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 *
 * See asm-generic/syscall.h for descriptions of what we must do here.
 */

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H	1

#include <linux/sched.h>
#include <linux/err.h>

static inline long syscall_get_nr(struct task_struct *task,
				  struct pt_regs *regs)
{
	/*
	 * We always sign-extend a -1 value being set here,
	 * so this is always either -1L or a syscall number.
	 */
	return regs->orig_ax;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	regs->ax = regs->orig_ax;
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	unsigned long error = regs->ax;
#ifdef CONFIG_IA32_EMULATION
	/*
	 * TS_COMPAT is set for 32-bit syscall entries and then
	 * remains set until we return to user mode.
	 */
	if (task_thread_info(task)->status & TS_COMPAT)
		/*
		 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
		 * and will match correctly in comparisons.
		 */
		error = (long) (int) error;
#endif
	return IS_ERR_VALUE(error) ? error : 0;
}