projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 56e62a73 SS |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef ARCH_S390_ENTRY_COMMON_H | |
| 3 | #define ARCH_S390_ENTRY_COMMON_H | |
| 4 | ||
| 5 | #include <linux/sched.h> | |
| 6 | #include <linux/audit.h> | |
| bae1cd36 | 7 | #include <linux/randomize_kstack.h> |
| 56e62a73 SS |
8 | #include <linux/processor.h> |
| 9 | #include <linux/uaccess.h> | |
| bae1cd36 | 10 | #include <asm/timex.h> |
| 56e62a73 | 11 | #include <asm/fpu/api.h> |
| 39d62336 | 12 | #include <asm/pai.h> |
| 56e62a73 SS |
13 | |
| 14 | #define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP) | |
| 15 | ||
| 16 | void do_per_trap(struct pt_regs *regs); | |
| 56e62a73 | 17 | |
| 6d97af48 | 18 | static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs) |
| 56e62a73 | 19 | { |
| 39d62336 TR |
20 | if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) |
| 21 | debug_user_asce(0); | |
| 22 | ||
| 23 | pai_kernel_enter(regs); | |
| 56e62a73 SS |
24 | } |
| 25 | ||
| 6d97af48 | 26 | #define arch_enter_from_user_mode arch_enter_from_user_mode |
| 56e62a73 SS |
27 | |
| 28 | static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs, | |
| 29 | unsigned long ti_work) | |
| 30 | { | |
| 31 | if (ti_work & _TIF_PER_TRAP) { | |
| 32 | clear_thread_flag(TIF_PER_TRAP); | |
| 33 | do_per_trap(regs); | |
| 34 | } | |
| 35 | ||
| 36 | if (ti_work & _TIF_GUARDED_STORAGE) | |
| 37 | gs_load_bc_cb(regs); | |
| 38 | } | |
| 39 | ||
| 40 | #define arch_exit_to_user_mode_work arch_exit_to_user_mode_work | |
| 41 | ||
| 42 | static __always_inline void arch_exit_to_user_mode(void) | |
| 43 | { | |
| 44 | if (test_cpu_flag(CIF_FPU)) | |
| 45 | __load_fpu_regs(); | |
| 46 | ||
| 47 | if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) | |
| 48 | debug_user_asce(1); | |
| 39d62336 TR |
49 | |
| 50 | pai_kernel_exit(current_pt_regs()); | |
| 56e62a73 SS |
51 | } |
| 52 | ||
| 53 | #define arch_exit_to_user_mode arch_exit_to_user_mode | |
| 54 | ||
| bae1cd36 SS |
55 | static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs, |
| 56 | unsigned long ti_work) | |
| 57 | { | |
| 58 | choose_random_kstack_offset(get_tod_clock_fast() & 0xff); | |
| 59 | } | |
| 60 | ||
| 61 | #define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare | |
| 62 | ||
| 56e62a73 SS |
63 | static inline bool on_thread_stack(void) |
| 64 | { | |
| 30de14b1 | 65 | return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1)); |
| 56e62a73 SS |
66 | } |
| 67 | ||
| 68 | #endif |