projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 753c4dd6 MS |
1 | /* |
| 2 | * Access to user system call parameters and results | |
| 3 | * | |
| 4 | * Copyright IBM Corp. 2008 | |
| 5 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License (version 2 only) | |
| 9 | * as published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #ifndef _ASM_SYSCALL_H | |
| 13 | #define _ASM_SYSCALL_H 1 | |
| 14 | ||
| 15 | #include <asm/ptrace.h> | |
| 16 | ||
| 17 | static inline long syscall_get_nr(struct task_struct *task, | |
| 18 | struct pt_regs *regs) | |
| 19 | { | |
| 59da2139 | 20 | return regs->svcnr ? regs->svcnr : -1; |
| 753c4dd6 MS |
21 | } |
| 22 | ||
| 23 | static inline void syscall_rollback(struct task_struct *task, | |
| 24 | struct pt_regs *regs) | |
| 25 | { | |
| 26 | regs->gprs[2] = regs->orig_gpr2; | |
| 27 | } | |
| 28 | ||
| 29 | static inline long syscall_get_error(struct task_struct *task, | |
| 30 | struct pt_regs *regs) | |
| 31 | { | |
| 32 | return (regs->gprs[2] >= -4096UL) ? -regs->gprs[2] : 0; | |
| 33 | } | |
| 34 | ||
| 35 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 36 | struct pt_regs *regs) | |
| 37 | { | |
| 38 | return regs->gprs[2]; | |
| 39 | } | |
| 40 | ||
| 41 | static inline void syscall_set_return_value(struct task_struct *task, | |
| 42 | struct pt_regs *regs, | |
| 43 | int error, long val) | |
| 44 | { | |
| 45 | regs->gprs[2] = error ? -error : val; | |
| 46 | } | |
| 47 | ||
| 48 | static inline void syscall_get_arguments(struct task_struct *task, | |
| 49 | struct pt_regs *regs, | |
| 50 | unsigned int i, unsigned int n, | |
| 51 | unsigned long *args) | |
| 52 | { | |
| 59da2139 MS |
53 | unsigned long mask = -1UL; |
| 54 | ||
| 753c4dd6 MS |
55 | BUG_ON(i + n > 6); |
| 56 | #ifdef CONFIG_COMPAT | |
| 59da2139 MS |
57 | if (test_tsk_thread_flag(task, TIF_31BIT)) |
| 58 | mask = 0xffffffff; | |
| 753c4dd6 MS |
59 | #endif |
| 60 | if (i + n == 6) | |
| 59da2139 MS |
61 | args[--n] = regs->args[0] & mask; |
| 62 | while (n-- > 0) | |
| 63 | if (i + n > 0) | |
| 64 | args[n] = regs->gprs[2 + i + n] & mask; | |
| 65 | if (i == 0) | |
| 66 | args[0] = regs->orig_gpr2 & mask; | |
| 753c4dd6 MS |
67 | } |
| 68 | ||
| 69 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 70 | struct pt_regs *regs, | |
| 71 | unsigned int i, unsigned int n, | |
| 72 | const unsigned long *args) | |
| 73 | { | |
| 74 | BUG_ON(i + n > 6); | |
| 75 | if (i + n == 6) | |
| 76 | regs->args[0] = args[--n]; | |
| 59da2139 MS |
77 | while (n-- > 0) |
| 78 | if (i + n > 0) | |
| 79 | regs->gprs[2 + i + n] = args[n]; | |
| 80 | if (i == 0) | |
| 81 | regs->orig_gpr2 = args[0]; | |
| 753c4dd6 MS |
82 | } |
| 83 | ||
| 84 | #endif /* _ASM_SYSCALL_H */ |