arch/xtensa/platforms/iss/include/platform/simcall-iss.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2021 Cadence Design Systems Inc. */

#ifndef _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H
#define _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H

/*
 *  System call like services offered by the simulator host.
 */

#define SYS_nop		0	/* unused */
#define SYS_exit	1	/*x*/
#define SYS_fork	2
#define SYS_read	3	/*x*/
#define SYS_write	4	/*x*/
#define SYS_open	5	/*x*/
#define SYS_close	6	/*x*/
#define SYS_rename	7	/*x 38 - waitpid */
#define SYS_creat	8	/*x*/
#define SYS_link	9	/*x (not implemented on WIN32) */
#define SYS_unlink	10	/*x*/
#define SYS_execv	11	/* n/a - execve */
#define SYS_execve	12	/* 11 - chdir */
#define SYS_pipe	13	/* 42 - time */
#define SYS_stat	14	/* 106 - mknod */
#define SYS_chmod	15
#define SYS_chown	16	/* 202 - lchown */
#define SYS_utime	17	/* 30 - break */
#define SYS_wait	18	/* n/a - oldstat */
#define SYS_lseek	19	/*x*/
#define SYS_getpid	20
#define SYS_isatty	21	/* n/a - mount */
#define SYS_fstat	22	/* 108 - oldumount */
#define SYS_time	23	/* 13 - setuid */
#define SYS_gettimeofday 24	/*x 78 - getuid (not implemented on WIN32) */
#define SYS_times	25	/*X 43 - stime (Xtensa-specific implementation) */
#define SYS_socket      26
#define SYS_sendto      27
#define SYS_recvfrom    28
#define SYS_select_one  29      /* not compatible select, one file descriptor at the time */
#define SYS_bind        30
#define SYS_ioctl	31

#define SYS_iss_argc	1000	/* returns value of argc */
#define SYS_iss_argv_size 1001	/* bytes needed for argv & arg strings */
#define SYS_iss_set_argv 1002	/* saves argv & arg strings at given addr */

/*
 * SYS_select_one specifiers
 */

#define  XTISS_SELECT_ONE_READ    1
#define  XTISS_SELECT_ONE_WRITE   2
#define  XTISS_SELECT_ONE_EXCEPT  3

static int errno;

static inline int __simc(int a, int b, int c, int d)
{
	register int a1 asm("a2") = a;
	register int b1 asm("a3") = b;
	register int c1 asm("a4") = c;
	register int d1 asm("a5") = d;
	__asm__ __volatile__ (
			"simcall\n"
			: "+r"(a1), "+r"(b1)
			: "r"(c1), "r"(d1)
			: "memory");
	errno = b1;
	return a1;
}

#endif /* _XTENSA_PLATFORM_ISS_SIMCALL_ISS_H */