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 | ||
| 9bf1226b | 15 | #include <linux/sched.h> |
| 753c4dd6 MS |
16 | #include <asm/ptrace.h> |
| 17 | ||
| e7b8e675 MF |
18 | /* |
| 19 | * The syscall table always contains 32 bit pointers since we know that the | |
| 20 | * address of the function to be called is (way) below 4GB. So the "int" | |
| 21 | * type here is what we want [need] for both 32 bit and 64 bit systems. | |
| 22 | */ | |
| 23 | extern const unsigned int sys_call_table[]; | |
| 24 | ||
| 753c4dd6 MS |
25 | static inline long syscall_get_nr(struct task_struct *task, |
| 26 | struct pt_regs *regs) | |
| 27 | { | |
| 59da2139 | 28 | return regs->svcnr ? regs->svcnr : -1; |
| 753c4dd6 MS |
29 | } |
| 30 | ||
| 31 | static inline void syscall_rollback(struct task_struct *task, | |
| 32 | struct pt_regs *regs) | |
| 33 | { | |
| 34 | regs->gprs[2] = regs->orig_gpr2; | |
| 35 | } | |
| 36 | ||
| 37 | static inline long syscall_get_error(struct task_struct *task, | |
| 38 | struct pt_regs *regs) | |
| 39 | { | |
| 40 | return (regs->gprs[2] >= -4096UL) ? -regs->gprs[2] : 0; | |
| 41 | } | |
| 42 | ||
| 43 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 44 | struct pt_regs *regs) | |
| 45 | { | |
| 46 | return regs->gprs[2]; | |
| 47 | } | |
| 48 | ||
| 49 | static inline void syscall_set_return_value(struct task_struct *task, | |
| 50 | struct pt_regs *regs, | |
| 51 | int error, long val) | |
| 52 | { | |
| 53 | regs->gprs[2] = error ? -error : val; | |
| 54 | } | |
| 55 | ||
| 56 | static inline void syscall_get_arguments(struct task_struct *task, | |
| 57 | struct pt_regs *regs, | |
| 58 | unsigned int i, unsigned int n, | |
| 59 | unsigned long *args) | |
| 60 | { | |
| 59da2139 MS |
61 | unsigned long mask = -1UL; |
| 62 | ||
| 753c4dd6 MS |
63 | BUG_ON(i + n > 6); |
| 64 | #ifdef CONFIG_COMPAT | |
| 59da2139 MS |
65 | if (test_tsk_thread_flag(task, TIF_31BIT)) |
| 66 | mask = 0xffffffff; | |
| 753c4dd6 MS |
67 | #endif |
| 68 | if (i + n == 6) | |
| 59da2139 MS |
69 | args[--n] = regs->args[0] & mask; |
| 70 | while (n-- > 0) | |
| 71 | if (i + n > 0) | |
| 72 | args[n] = regs->gprs[2 + i + n] & mask; | |
| 73 | if (i == 0) | |
| 74 | args[0] = regs->orig_gpr2 & mask; | |
| 753c4dd6 MS |
75 | } |
| 76 | ||
| 77 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 78 | struct pt_regs *regs, | |
| 79 | unsigned int i, unsigned int n, | |
| 80 | const unsigned long *args) | |
| 81 | { | |
| 82 | BUG_ON(i + n > 6); | |
| 83 | if (i + n == 6) | |
| 84 | regs->args[0] = args[--n]; | |
| 59da2139 MS |
85 | while (n-- > 0) |
| 86 | if (i + n > 0) | |
| 87 | regs->gprs[2 + i + n] = args[n]; | |
| 88 | if (i == 0) | |
| 89 | regs->orig_gpr2 = args[0]; | |
| 753c4dd6 MS |
90 | } |
| 91 | ||
| 92 | #endif /* _ASM_SYSCALL_H */ |