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
linux32_syscall_code_remap(uint32_t code)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