/* SPDX-License-Identifier: GPL-2.0 */ #ifndef ARCH_S390_ENTRY_COMMON_H #define ARCH_S390_ENTRY_COMMON_H #include <linux/sched.h> #include <linux/audit.h> #include <linux/randomize_kstack.h> #include <linux/processor.h> #include <linux/uaccess.h> #include <asm/timex.h> #include <asm/fpu/api.h> #include <asm/pai.h> #define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_GUARDED_STORAGE | _TIF_PER_TRAP) void do_per_trap(struct pt_regs *regs); static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs) { if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) debug_user_asce(0); pai_kernel_enter(regs); } #define arch_enter_from_user_mode arch_enter_from_user_mode static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs, unsigned long ti_work) { if (ti_work & _TIF_PER_TRAP) { clear_thread_flag(TIF_PER_TRAP); do_per_trap(regs); } if (ti_work & _TIF_GUARDED_STORAGE) gs_load_bc_cb(regs); } #define arch_exit_to_user_mode_work arch_exit_to_user_mode_work static __always_inline void arch_exit_to_user_mode(void) { if (test_cpu_flag(CIF_FPU)) __load_fpu_regs(); if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) debug_user_asce(1); pai_kernel_exit(current_pt_regs()); } #define arch_exit_to_user_mode arch_exit_to_user_mode static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs, unsigned long ti_work) { choose_random_kstack_offset(get_tod_clock_fast() & 0xff); } #define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare static inline bool on_thread_stack(void) { return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1)); } #endif