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f1ba1285 RM |
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 | ||
02424d89 IM |
18 | /* ftrace syscalls requires exporting the sys_call_table */ |
19 | #ifdef CONFIG_FTRACE_SYSCALLS | |
20 | extern const unsigned long *sys_call_table; | |
21 | #endif /* CONFIG_FTRACE_SYSCALLS */ | |
22 | ||
f1ba1285 RM |
23 | static 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 | ||
29 | static inline void syscall_rollback(struct task_struct *task, | |
30 | struct pt_regs *regs) | |
31 | { | |
32 | regs->gpr[3] = regs->orig_gpr3; | |
33 | } | |
34 | ||
35 | static inline long syscall_get_error(struct task_struct *task, | |
36 | struct pt_regs *regs) | |
37 | { | |
409d241b | 38 | return (regs->ccr & 0x10000000) ? -regs->gpr[3] : 0; |
f1ba1285 RM |
39 | } |
40 | ||
41 | static inline long syscall_get_return_value(struct task_struct *task, | |
42 | struct pt_regs *regs) | |
43 | { | |
44 | return regs->gpr[3]; | |
45 | } | |
46 | ||
47 | static inline void syscall_set_return_value(struct task_struct *task, | |
48 | struct pt_regs *regs, | |
49 | int error, long val) | |
50 | { | |
51 | if (error) { | |
409d241b | 52 | regs->ccr |= 0x10000000L; |
f1ba1285 RM |
53 | regs->gpr[3] = -error; |
54 | } else { | |
409d241b | 55 | regs->ccr &= ~0x10000000L; |
f1ba1285 RM |
56 | regs->gpr[3] = val; |
57 | } | |
58 | } | |
59 | ||
60 | static 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 | ||
80 | static 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 */ |