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      1 /*	$NetBSD: linux32_syscall.c,v 1.1 2021/11/25 03:08:04 ryo Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2021 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Ryo Shimizu.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: linux32_syscall.c,v 1.1 2021/11/25 03:08:04 ryo Exp $");
     34 
     35 #if defined(_KERNEL_OPT)
     36 #include "opt_compat_linux32.h"
     37 #endif
     38 
     39 #include <sys/param.h>
     40 #include <sys/types.h>
     41 
     42 #include <compat/linux32/linux32_syscall.h>
     43 #include <compat/linux32/common/linux32_errno.h>
     44 
     45 #define EMULNAME(x)		__CONCAT(linux32_,x)
     46 #define EMULNAMEU(x)		__CONCAT(LINUX32_,x)
     47 
     48 /*
     49  * syscall.c behavior options
     50  */
     51 
     52 /*
     53  * EABI linux/arm always uses indirect syscall, and code of 'svc #<code>' must
     54  * be zero. The system call number is specified by the r7 register.
     55  */
     56 #define NARGREG			7 /* Seven(all) arguments are passed in r0-r6 */
     57 #define SYSCALL_CODE_REG	7 /* syscall number is passed in r7 */
     58 #define SYSCALL_CODE_REG_SVC	0 /* Non-zero is OABI, but not supported */
     59 #define SYSCALL_NO_INDIRECT
     60 
     61 /* used when __HAVE_MINIMAL_EMUL is not defined */
     62 #define SYSCALL_EMUL_ERRNO(x)	native_to_linux32_errno[x]
     63 
     64 /* don't update x1 register with rval[1] */
     65 #define SYSCALL_NO_RVAL1
     66 
     67 #define SYSCALL_CODE_REMAP(code)	linux32_syscall_code_remap(code)
     68 
     69 /*
     70  * see also comments in the bottom of
     71  * sys/compat/linux32/arch/aarch64/syscalls.master
     72  */
     73 #define LINUX32_EARM_NR_BASE		0x0f0000
     74 #define LINUX32_SYS_ARMBASE		480
     75 
     76 static inline uint32_t
     77 linux32_syscall_code_remap(uint32_t code)
     78 {
     79 	if (code > LINUX32_EARM_NR_BASE)
     80 		code = code - LINUX32_EARM_NR_BASE + LINUX32_SYS_ARMBASE;
     81 	return code;
     82 }
     83 
     84 #include "aarch32_syscall.c"
     85