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/* Access to user system call parameters and results
 *
 * See asm-generic/syscall.h for function descriptions.
 *
 * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H

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

extern const unsigned long sys_call_table[];

static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
{
	return regs->orig_d0;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	regs->d0 = regs->orig_d0;
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	unsigned long error = regs->d0;
	return IS_ERR_VALUE(error) ? error : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->d0;
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->d0 = (long) error ?: val;
}

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	switch (i) {
	case 0:
		if (!n--) break;
		*args++ = regs->a0;
	case 1:
		if (!n--) break;
		*args++ = regs->d1;
	case 2:
		if (!n--) break;
		*args++ = regs->a3;
	case 3:
		if (!n--) break;
		*args++ = regs->a2;
	case 4:
		if (!n--) break;
		*args++ = regs->d3;
	case 5:
		if (!n--) break;
		*args++ = regs->d2;
	case 6:
		if (!n--) break;
	default:
		BUG();
		break;
	}
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 const unsigned long *args)
{
	switch (i) {
	case 0:
		if (!n--) break;
		regs->a0 = *args++;
	case 1:
		if (!n--) break;
		regs->d1 = *args++;
	case 2:
		if (!n--) break;
		regs->a3 = *args++;
	case 3:
		if (!n--) break;
		regs->a2 = *args++;
	case 4:
		if (!n--) break;
		regs->d3 = *args++;
	case 5:
		if (!n--) break;
		regs->d2 = *args++;
	case 6:
		if (!n--) break;
	default:
		BUG();
		break;
	}
}

#endif /* _ASM_SYSCALL_H */

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Name Type Size Permission Actions
Kbuild File 314 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 4.02 KB 0644
bitops.h File 5.42 KB 0644
bug.h File 864 B 0644
bugs.h File 561 B 0644
busctl-regs.h File 7.8 KB 0644
cache.h File 2.06 KB 0644
cacheflush.h File 7.6 KB 0644
checksum.h File 2.09 KB 0644
cmpxchg.h File 2.65 KB 0644
cpu-regs.h File 16.61 KB 0644
current.h File 922 B 0644
debugger.h File 1.2 KB 0644
delay.h File 597 B 0644
div64.h File 3.21 KB 0644
dma-mapping.h File 636 B 0644
dma.h File 3.09 KB 0644
dmactl-regs.h File 532 B 0644
elf.h File 4.49 KB 0644
emergency-restart.h File 43 B 0644
exceptions.h File 4.74 KB 0644
fpu.h File 3.57 KB 0644
frame.inc File 2.37 KB 0644
ftrace.h File 12 B 0644
futex.h File 31 B 0644
gdb-stub.h File 5.42 KB 0644
hardirq.h File 1.68 KB 0644
highmem.h File 3.01 KB 0644
hw_irq.h File 483 B 0644
intctl-regs.h File 2.26 KB 0644
io.h File 7.67 KB 0644
irq.h File 1.11 KB 0644
irq_regs.h File 751 B 0644
irqflags.h File 4.05 KB 0644
kdebug.h File 561 B 0644
kgdb.h File 1.7 KB 0644
kmap_types.h File 160 B 0644
kprobes.h File 1.59 KB 0644
linkage.h File 593 B 0644
local.h File 31 B 0644
local64.h File 33 B 0644
mc146818rtc.h File 26 B 0644
mmu.h File 434 B 0644
mmu_context.h File 4.44 KB 0644
module.h File 677 B 0644
nmi.h File 500 B 0644
page.h File 3.63 KB 0644
page_offset.h File 302 B 0644
pci.h File 2.17 KB 0644
percpu.h File 32 B 0644
pgalloc.h File 1.49 KB 0644
pgtable.h File 15.68 KB 0644
pio-regs.h File 7.53 KB 0644
processor.h File 4.12 KB 0644
ptrace.h File 805 B 0644
reset-regs.h File 1.8 KB 0644
rtc-regs.h File 3.57 KB 0644
rtc.h File 692 B 0644
rwlock.h File 2.98 KB 0644
serial-regs.h File 8.85 KB 0644
serial.h File 1.02 KB 0644
setup.h File 574 B 0644
shmparam.h File 182 B 0644
signal.h File 888 B 0644
smp.h File 3.06 KB 0644
smsc911x.h File 27 B 0644
spinlock.h File 3.84 KB 0644
spinlock_types.h File 445 B 0644
string.h File 1.03 KB 0644
switch_to.h File 1.49 KB 0644
syscall.h File 2.38 KB 0644
termios.h File 387 B 0644
thread_info.h File 4.36 KB 0644
timer-regs.h File 20.72 KB 0644
timex.h File 843 B 0644
tlb.h File 941 B 0644
tlbflush.h File 3.45 KB 0644
topology.h File 34 B 0644
types.h File 620 B 0644
uaccess.h File 7.78 KB 0644
ucontext.h File 673 B 0644
unaligned.h File 678 B 0644
unistd.h File 1.34 KB 0644
user.h File 1.91 KB 0644
vga.h File 471 B 0644
xor.h File 29 B 0644