mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 21:52:04 +00:00
22ca1e7738
As preparation for the stackleak feature move on_thread_stack() to processor.h like x86. Also make it __always_inline, and slightly optimize it by reading current task's kernel stack pointer from lowcore. Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/* 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
|
|
|
|
#endif
|