Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Access to user system call parameters and results
3 *
4 * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
5 *
6 * This copyrighted material is made available to anyone wishing to use,
7 * modify, copy, or redistribute it subject to the terms and conditions
8 * of the GNU General Public License v.2.
9 *
10 * See asm-generic/syscall.h for descriptions of what we must do here.
11 */
12
13#ifndef _ASM_SYSCALL_H
14#define _ASM_SYSCALL_H 1
15
16#include <linux/sched.h>
17
18/* ftrace syscalls requires exporting the sys_call_table */
19#ifdef CONFIG_FTRACE_SYSCALLS
20extern const unsigned long *sys_call_table;
21#endif /* CONFIG_FTRACE_SYSCALLS */
22
23static inline long syscall_get_nr(struct task_struct *task,
24 struct pt_regs *regs)
25{
26 return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1L;
27}
28
29static inline void syscall_rollback(struct task_struct *task,
30 struct pt_regs *regs)
31{
32 regs->gpr[3] = regs->orig_gpr3;
33}
34
35static inline long syscall_get_error(struct task_struct *task,
36 struct pt_regs *regs)
37{
38 return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0;
39}
40
41static inline long syscall_get_return_value(struct task_struct *task,
42 struct pt_regs *regs)
43{
44 return regs->gpr[3];
45}
46
47static inline void syscall_set_return_value(struct task_struct *task,
48 struct pt_regs *regs,
49 int error, long val)
50{
51 if (error) {
52 regs->ccr |= 0x10000000L;
53 regs->gpr[3] = -error;
54 } else {
55 regs->ccr &= ~0x10000000L;
56 regs->gpr[3] = val;
57 }
58}
59
60static inline void syscall_get_arguments(struct task_struct *task,
61 struct pt_regs *regs,
62 unsigned int i, unsigned int n,
63 unsigned long *args)
64{
65 BUG_ON(i + n > 6);
66#ifdef CONFIG_PPC64
67 if (test_tsk_thread_flag(task, TIF_32BIT)) {
68 /*
69 * Zero-extend 32-bit argument values. The high bits are
70 * garbage ignored by the actual syscall dispatch.
71 */
72 while (n-- > 0)
73 args[n] = (u32) regs->gpr[3 + i + n];
74 return;
75 }
76#endif
77 memcpy(args, ®s->gpr[3 + i], n * sizeof(args[0]));
78}
79
80static inline void syscall_set_arguments(struct task_struct *task,
81 struct pt_regs *regs,
82 unsigned int i, unsigned int n,
83 const unsigned long *args)
84{
85 BUG_ON(i + n > 6);
86 memcpy(®s->gpr[3 + i], args, n * sizeof(args[0]));
87}
88
89#endif /* _ASM_SYSCALL_H */