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>
7 #include <linux/randomize_kstack.h>
8 #include <linux/processor.h>
9 #include <linux/uaccess.h>
10 #include <asm/timex.h>
11 #include <asm/fpu.h>
12 #include <asm/pai.h>
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);
17
18 static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs)
19 {
20 if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
21 debug_user_asce(0);
22
23 pai_kernel_enter(regs);
24 }
25
26 #define arch_enter_from_user_mode arch_enter_from_user_mode
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 load_user_fpu_regs();
45
46 if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
47 debug_user_asce(1);
48
49 pai_kernel_exit(current_pt_regs());
50 }
51
52 #define arch_exit_to_user_mode arch_exit_to_user_mode
53
54 static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
55 unsigned long ti_work)
56 {
57 choose_random_kstack_offset(get_tod_clock_fast());
58 }
59
60 #define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
61
62 #endif
63
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