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