cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

entry-common.h (1639B)

      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
     16void do_per_trap(struct pt_regs *regs);
     17
     18static __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
     28static __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
     42static __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
     55static 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
     63static inline bool on_thread_stack(void)
     64{
     65	return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
     66}
     67
     68#endif