arch/s390/include/asm/entry-common.h

   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
  16 void do_per_trap(struct pt_regs *regs);
  17
  18 #ifdef CONFIG_DEBUG_ENTRY
  19 static __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
  27 static __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
  41 static __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
  52 static 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
  60 static inline bool on_thread_stack(void)
  61 {
  62         return !(((unsigned long)(current->stack) ^ current_stack_pointer()) & ~(THREAD_SIZE - 1));
  63 }
  64
  65 #endif