1 /*
2 * Copyright (c) 2015 Google Inc. All rights reserved
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #include "smc.h"
25
26 #if ARCH_ARM64
27 #define SMC_ARG0 "x0"
28 #define SMC_ARG1 "x1"
29 #define SMC_ARG2 "x2"
30 #define SMC_ARG3 "x3"
31 #define SMC_ARCH_EXTENSION ""
32 #define SMC_REGISTERS_TRASHED \
33 "x4", "x5", "x6", "x7", "x8", "x9", "x10", "x11", "x12", "x13", "x14", \
34 "x15", "x16", "x17"
35 #else
36 #define SMC_ARG0 "r0"
37 #define SMC_ARG1 "r1"
38 #define SMC_ARG2 "r2"
39 #define SMC_ARG3 "r3"
40 #define SMC_ARCH_EXTENSION ".arch_extension sec\n"
41 #define SMC_REGISTERS_TRASHED "ip"
42 #endif
43
generic_arm64_smc(ulong r0,ulong r1,ulong r2,ulong r3)44 ulong generic_arm64_smc(ulong r0, ulong r1, ulong r2, ulong r3) {
45 register ulong _r0 __asm__(SMC_ARG0) = r0;
46 register ulong _r1 __asm__(SMC_ARG1) = r1;
47 register ulong _r2 __asm__(SMC_ARG2) = r2;
48 register ulong _r3 __asm__(SMC_ARG3) = r3;
49
50 __asm__ volatile(SMC_ARCH_EXTENSION "smc #0" /* switch to secure world */
51 : "=r"(_r0), "=r"(_r1), "=r"(_r2), "=r"(_r3)
52 : "r"(_r0), "r"(_r1), "r"(_r2), "r"(_r3)
53 : SMC_REGISTERS_TRASHED);
54 return _r0;
55 }
56