cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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restart_syscall.S (647B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Syscall restart trampoline for 32 and 64 bits processes.
      4 *
      5 * Copyright (C) 2018-2022 Helge Deller <deller@gmx.de>
      6 * Copyright (C) 2022 John David Anglin <dave.anglin@bell.net>
      7 */
      8
      9#include <asm/unistd.h>
     10#include <asm/vdso.h>
     11
     12#include <linux/linkage.h>
     13
     14	.text
     15
     16ENTRY_CFI(__kernel_restart_syscall)
     17	/*
     18	 * Setup a trampoline to restart the syscall
     19	 * with __NR_restart_syscall
     20	 */
     21
     22	/* load return pointer */
     23#if defined(__VDSO64__)
     24	ldd	0(%sp), %r31
     25#elif defined(__VDSO32__)
     26	ldw	0(%sp), %r31
     27#endif
     28
     29	be	0x100(%sr2, %r0)
     30	ldi	__NR_restart_syscall, %r20
     31
     32ENDPROC_CFI(__kernel_restart_syscall)