strace/linux/aarch64/get_scno.c

/*
 * Copyright (c) 2015-2018 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

/* Return codes: 1 - ok, 0 - ignore, other - error. */
static int
arch_get_scno(struct tcb *tcp)
{
	kernel_ulong_t scno = 0;

	switch (aarch64_io.iov_len) {
		case sizeof(aarch64_regs):
			/* We are in 64-bit mode */
			scno = aarch64_regs.regs[8];
			break;
		case sizeof(arm_regs):
			/* We are in 32-bit mode */
			/* Note: we don't support OABI, unlike 32-bit ARM build */
			scno = arm_regs.ARM_r7;
			break;
	}

	tcp->scno = scno;
	return 1;
}