projects / thirdparty / kernel / stable.git / blame
| Commit | Line | Data |
|---|---|---|
| 0b73214f | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 753c4dd6 MS |
2 | /* |
| 3 | * Access to user system call parameters and results | |
| 4 | * | |
| 5 | * Copyright IBM Corp. 2008 | |
| 6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) | |
| 753c4dd6 MS |
7 | */ |
| 8 | ||
| 9 | #ifndef _ASM_SYSCALL_H | |
| 10 | #define _ASM_SYSCALL_H 1 | |
| 11 | ||
| 579ec9e1 | 12 | #include <uapi/linux/audit.h> |
| 9bf1226b | 13 | #include <linux/sched.h> |
| 20b40a79 | 14 | #include <linux/err.h> |
| 753c4dd6 MS |
15 | #include <asm/ptrace.h> |
| 16 | ||
| e7b8e675 MF |
17 | /* |
| 18 | * The syscall table always contains 32 bit pointers since we know that the | |
| 19 | * address of the function to be called is (way) below 4GB. So the "int" | |
| 20 | * type here is what we want [need] for both 32 bit and 64 bit systems. | |
| 21 | */ | |
| 22 | extern const unsigned int sys_call_table[]; | |
| 61649881 | 23 | extern const unsigned int sys_call_table_emu[]; |
| e7b8e675 | 24 | |
| 753c4dd6 MS |
25 | static inline long syscall_get_nr(struct task_struct *task, |
| 26 | struct pt_regs *regs) | |
| 27 | { | |
| d3a73acb | 28 | return test_pt_regs_flag(regs, PIF_SYSCALL) ? |
| aa33c8cb | 29 | (regs->int_code & 0xffff) : -1; |
| 753c4dd6 MS |
30 | } |
| 31 | ||
| 32 | static inline void syscall_rollback(struct task_struct *task, | |
| 33 | struct pt_regs *regs) | |
| 34 | { | |
| 35 | regs->gprs[2] = regs->orig_gpr2; | |
| 36 | } | |
| 37 | ||
| 38 | static inline long syscall_get_error(struct task_struct *task, | |
| 39 | struct pt_regs *regs) | |
| 40 | { | |
| 20b40a79 | 41 | return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0; |
| 753c4dd6 MS |
42 | } |
| 43 | ||
| 44 | static inline long syscall_get_return_value(struct task_struct *task, | |
| 45 | struct pt_regs *regs) | |
| 46 | { | |
| 47 | return regs->gprs[2]; | |
| 48 | } | |
| 49 | ||
| 50 | static inline void syscall_set_return_value(struct task_struct *task, | |
| 51 | struct pt_regs *regs, | |
| 52 | int error, long val) | |
| 53 | { | |
| dc295880 | 54 | regs->gprs[2] = error ? error : val; |
| 753c4dd6 MS |
55 | } |
| 56 | ||
| 57 | static inline void syscall_get_arguments(struct task_struct *task, | |
| 58 | struct pt_regs *regs, | |
| 753c4dd6 MS |
59 | unsigned long *args) |
| 60 | { | |
| 59da2139 | 61 | unsigned long mask = -1UL; |
| b35f549d | 62 | unsigned int n = 6; |
| 59da2139 | 63 | |
| 753c4dd6 | 64 | #ifdef CONFIG_COMPAT |
| 59da2139 MS |
65 | if (test_tsk_thread_flag(task, TIF_31BIT)) |
| 66 | mask = 0xffffffff; | |
| 753c4dd6 | 67 | #endif |
| 59da2139 | 68 | while (n-- > 0) |
| b35f549d SRRH |
69 | if (n > 0) |
| 70 | args[n] = regs->gprs[2 + n] & mask; | |
| 71 | ||
| 72 | args[0] = regs->orig_gpr2 & mask; | |
| 753c4dd6 MS |
73 | } |
| 74 | ||
| 75 | static inline void syscall_set_arguments(struct task_struct *task, | |
| 76 | struct pt_regs *regs, | |
| 753c4dd6 MS |
77 | const unsigned long *args) |
| 78 | { | |
| 32d92586 SRV |
79 | unsigned int n = 6; |
| 80 | ||
| 59da2139 | 81 | while (n-- > 0) |
| 32d92586 SRV |
82 | if (n > 0) |
| 83 | regs->gprs[2 + n] = args[n]; | |
| 84 | regs->orig_gpr2 = args[0]; | |
| 753c4dd6 MS |
85 | } |
| 86 | ||
| 5e937a9a | 87 | static inline int syscall_get_arch(void) |
| c63cb468 HC |
88 | { |
| 89 | #ifdef CONFIG_COMPAT | |
| 5e937a9a | 90 | if (test_tsk_thread_flag(current, TIF_31BIT)) |
| c63cb468 HC |
91 | return AUDIT_ARCH_S390; |
| 92 | #endif | |
| 1a327ffd | 93 | return AUDIT_ARCH_S390X; |
| c63cb468 | 94 | } |
| 753c4dd6 | 95 | #endif /* _ASM_SYSCALL_H */ |