1 /** @file 2 Macros to work around lack of Clang support for LDR register, =expr 3 4 Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR> 5 Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR> 6 7 This program and the accompanying materials 8 are licensed and made available under the terms and conditions of the BSD License 9 which accompanies this distribution. The full text of the license may be found at 10 http://opensource.org/licenses/bsd-license.php 11 12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 15 **/ 16 17 18 #ifndef __MACRO_IO_LIBV8_H__ 19 #define __MACRO_IO_LIBV8_H__ 20 21 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1 22 // This only selects between EL1 and EL2, else we die. 23 // Provide the Macro with a safe temp xreg to use. 24 #define EL1_OR_EL2(SAFE_XREG) \ 25 mrs SAFE_XREG, CurrentEL ;\ 26 cmp SAFE_XREG, #0x8 ;\ 27 b.eq 2f ;\ 28 cmp SAFE_XREG, #0x4 ;\ 29 b.ne . ;// We should never get here 30 // EL1 code starts here 31 32 // CurrentEL : 0xC = EL3; 8 = EL2; 4 = EL1 33 // This only selects between EL1 and EL2 and EL3, else we die. 34 // Provide the Macro with a safe temp xreg to use. 35 #define EL1_OR_EL2_OR_EL3(SAFE_XREG) \ 36 mrs SAFE_XREG, CurrentEL ;\ 37 cmp SAFE_XREG, #0xC ;\ 38 b.eq 3f ;\ 39 cmp SAFE_XREG, #0x8 ;\ 40 b.eq 2f ;\ 41 cmp SAFE_XREG, #0x4 ;\ 42 b.ne . ;// We should never get here 43 // EL1 code starts here 44 #if defined(__clang__) 45 46 // load x0 with _Data 47 #define LoadConstant(_Data) \ 48 ldr x0, 1f ; \ 49 b 2f ; \ 50 .align(8) ; \ 51 1: \ 52 .8byte (_Data) ; \ 53 2: 54 55 // load _Reg with _Data 56 #define LoadConstantToReg(_Data, _Reg) \ 57 ldr _Reg, 1f ; \ 58 b 2f ; \ 59 .align(8) ; \ 60 1: \ 61 .8byte (_Data) ; \ 62 2: 63 64 #elif defined (__GNUC__) 65 66 #define LoadConstant(Data) \ 67 ldr x0, =Data 68 69 #define LoadConstantToReg(Data, Reg) \ 70 ldr Reg, =Data 71 72 #endif // __GNUC__ 73 74 #endif // __MACRO_IO_LIBV8_H__ 75 76
