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) 33