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/api.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 if (test_cpu_flag(CIF_FPU)) 45 __load_fpu_regs(); 46 47 if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) 48 debug_user_asce(1); 49 50 pai_kernel_exit(current_pt_regs()); 51 } 52 53 #define arch_exit_to_user_mode arch_exit_to_user_mode 54 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 63 static inline bool on_thread_stack(void) 64 { 65 return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1)); 66 } 67 68 #endif 69