simcall-gdbio.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/* Copyright (C) 2021 Cadence Design Systems Inc. */
 3
 4#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
 5#define _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H
 6
 7/*
 8 *  System call like services offered by the GDBIO host.
 9 */
10
11#define SYS_open	-2
12#define SYS_close	-3
13#define SYS_read	-4
14#define SYS_write	-5
15#define SYS_lseek	-6
16
17static int errno;
18
19static inline int __simc(int a, int b, int c, int d)
20{
21	register int a1 asm("a2") = a;
22	register int b1 asm("a6") = b;
23	register int c1 asm("a3") = c;
24	register int d1 asm("a4") = d;
25	__asm__ __volatile__ (
26			"break 1, 14\n"
27			: "+r"(a1), "+r"(c1)
28			: "r"(b1), "r"(d1)
29			: "memory");
30	errno = c1;
31	return a1;
32}
33
34#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_GDBIO_H */