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/* 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
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