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/tracehook.h>
8 #include <linux/processor.h>
9 #include <linux/uaccess.h>
10 #include <asm/fpu/api.h>
11 
12 #define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP)
13 
14 void do_per_trap(struct pt_regs *regs);
15 void do_syscall(struct pt_regs *regs);
16 
17 typedef void (*pgm_check_func)(struct pt_regs *regs);
18 
19 extern pgm_check_func pgm_check_table[128];
20 
21 #ifdef CONFIG_DEBUG_ENTRY
22 static __always_inline void arch_check_user_regs(struct pt_regs *regs)
23 {
24 	debug_user_asce(0);
25 }
26 
27 #define arch_check_user_regs arch_check_user_regs
28 #endif /* CONFIG_DEBUG_ENTRY */
29 
30 static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs,
31 							unsigned long ti_work)
32 {
33 	if (ti_work & _TIF_PER_TRAP) {
34 		clear_thread_flag(TIF_PER_TRAP);
35 		do_per_trap(regs);
36 	}
37 
38 	if (ti_work & _TIF_GUARDED_STORAGE)
39 		gs_load_bc_cb(regs);
40 }
41 
42 #define arch_exit_to_user_mode_work arch_exit_to_user_mode_work
43 
44 static __always_inline void arch_exit_to_user_mode(void)
45 {
46 	if (test_cpu_flag(CIF_FPU))
47 		__load_fpu_regs();
48 
49 	if (IS_ENABLED(CONFIG_DEBUG_ENTRY))
50 		debug_user_asce(1);
51 }
52 
53 #define arch_exit_to_user_mode arch_exit_to_user_mode
54 
55 static inline bool on_thread_stack(void)
56 {
57 	return !(((unsigned long)(current->stack) ^ current_stack_pointer()) & ~(THREAD_SIZE - 1));
58 }
59 
60 #endif
61