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/tracehook.h> 9#include <linux/processor.h> 10#include <linux/uaccess.h> 11#include <asm/timex.h> 12#include <asm/fpu/api.h> 13 14#define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP) 15 16void do_per_trap(struct pt_regs *regs); 17 18#ifdef CONFIG_DEBUG_ENTRY 19static __always_inline void arch_check_user_regs(struct pt_regs *regs) 20{ 21 debug_user_asce(0); 22} 23 24#define arch_check_user_regs arch_check_user_regs 25#endif /* CONFIG_DEBUG_ENTRY */ 26 27static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs, 28 unsigned long ti_work) 29{ 30 if (ti_work & _TIF_PER_TRAP) { 31 clear_thread_flag(TIF_PER_TRAP); 32 do_per_trap(regs); 33 } 34 35 if (ti_work & _TIF_GUARDED_STORAGE) 36 gs_load_bc_cb(regs); 37} 38 39#define arch_exit_to_user_mode_work arch_exit_to_user_mode_work 40 41static __always_inline void arch_exit_to_user_mode(void) 42{ 43 if (test_cpu_flag(CIF_FPU)) 44 __load_fpu_regs(); 45 46 if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) 47 debug_user_asce(1); 48} 49 50#define arch_exit_to_user_mode arch_exit_to_user_mode 51 52static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs, 53 unsigned long ti_work) 54{ 55 choose_random_kstack_offset(get_tod_clock_fast() & 0xff); 56} 57 58#define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare 59 60static inline bool on_thread_stack(void) 61{ 62 return !(((unsigned long)(current->stack) ^ current_stack_pointer()) & ~(THREAD_SIZE - 1)); 63} 64 65#endif 66