projects / thirdparty / kernel / stable.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 | ||
| 579ec9e1 | 15 | #include <uapi/linux/audit.h> |
| 9bf1226b | 16 | #include <linux/sched.h> |
| 20b40a79 | 17 | #include <linux/err.h> |
| 753c4dd6 MS |
18 | #include <asm/ptrace.h> |
| 19 | ||
| e7b8e675 MF |
20 | /* |
| 21 | * The syscall table always contains 32 bit pointers since we know that the | |
| 22 | * address of the function to be called is (way) below 4GB. So the "int" | |
| 23 | * type here is what we want [need] for both 32 bit and 64 bit systems. | |
| 24 | */ | |
| 25 | extern const unsigned int sys_call_table[]; | |
| 61649881 | 26 | extern const unsigned int sys_call_table_emu[]; |
| e7b8e675 | 27 | |
| 753c4dd6 MS |
28 | static inline long syscall_get_nr(struct task_struct *task, |
| 29 | struct pt_regs *regs) | |
| 30 | { | |
| d3a73acb | 31 | return test_pt_regs_flag(regs, PIF_SYSCALL) ? |
| aa33c8cb | 32 | (regs->int_code & 0xffff) : -1; |
| 753c4dd6 MS |
33 | } |
| 34 | ||
| 35 | static inline void syscall_rollback(struct task_struct *task, | |
| 36 | struct pt_regs *regs) | |
| 37 | { | |
| 38 | regs->gprs[2] = regs->orig_gpr2; | |
| 39 | } | |
| 40 | ||
| 41 | static inline long syscall_get_error(struct task_struct *task, | |
| 42 | struct pt_regs *regs) | |
| 43 | { | |
| 20b40a79 | 44 | return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0; |
| 753c4dd6 MS |
45 | } |
| 46 | ||
| 47 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 48 | struct pt_regs *regs) | |
| 49 | { | |
| 50 | return regs->gprs[2]; | |
| 51 | } | |
| 52 | ||
| 53 | static inline void syscall_set_return_value(struct task_struct *task, | |
| 54 | struct pt_regs *regs, | |
| 55 | int error, long val) | |
| 56 | { | |
| dc295880 | 57 | regs->gprs[2] = error ? error : val; |
| 753c4dd6 MS |
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 | { | |
| 59da2139 MS |
65 | unsigned long mask = -1UL; |
| 66 | ||
| c46fc042 JO |
67 | /* |
| 68 | * No arguments for this syscall, there's nothing to do. | |
| 69 | */ | |
| 70 | if (!n) | |
| 71 | return; | |
| 72 | ||
| 753c4dd6 MS |
73 | BUG_ON(i + n > 6); |
| 74 | #ifdef CONFIG_COMPAT | |
| 59da2139 MS |
75 | if (test_tsk_thread_flag(task, TIF_31BIT)) |
| 76 | mask = 0xffffffff; | |
| 753c4dd6 | 77 | #endif |
| 59da2139 MS |
78 | while (n-- > 0) |
| 79 | if (i + n > 0) | |
| 80 | args[n] = regs->gprs[2 + i + n] & mask; | |
| 81 | if (i == 0) | |
| 82 | args[0] = regs->orig_gpr2 & mask; | |
| 753c4dd6 MS |
83 | } |
| 84 | ||
| 85 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 86 | struct pt_regs *regs, | |
| 87 | unsigned int i, unsigned int n, | |
| 88 | const unsigned long *args) | |
| 89 | { | |
| 90 | BUG_ON(i + n > 6); | |
| 59da2139 MS |
91 | while (n-- > 0) |
| 92 | if (i + n > 0) | |
| 93 | regs->gprs[2 + i + n] = args[n]; | |
| 94 | if (i == 0) | |
| 95 | regs->orig_gpr2 = args[0]; | |
| 753c4dd6 MS |
96 | } |
| 97 | ||
| 5e937a9a | 98 | static inline int syscall_get_arch(void) |
| c63cb468 HC |
99 | { |
| 100 | #ifdef CONFIG_COMPAT | |
| 5e937a9a | 101 | if (test_tsk_thread_flag(current, TIF_31BIT)) |
| c63cb468 HC |
102 | return AUDIT_ARCH_S390; |
| 103 | #endif | |
| 1a327ffd | 104 | return AUDIT_ARCH_S390X; |
| c63cb468 | 105 | } |
| 753c4dd6 | 106 | #endif /* _ASM_SYSCALL_H */ |