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/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 #endif