1 /* 2 * arch/arm/include/asm/opcodes.h 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __ASM_ARM_OPCODES_H 10 #define __ASM_ARM_OPCODES_H 11 12 #ifndef __ASSEMBLY__ 13 extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr); 14 #endif 15 16 #define ARM_OPCODE_CONDTEST_FAIL 0 17 #define ARM_OPCODE_CONDTEST_PASS 1 18 #define ARM_OPCODE_CONDTEST_UNCOND 2 19 20 21 /* 22 * Opcode byteswap helpers 23 * 24 * These macros help with converting instructions between a canonical integer 25 * format and in-memory representation, in an endianness-agnostic manner. 26 * 27 * __mem_to_opcode_*() convert from in-memory representation to canonical form. 28 * __opcode_to_mem_*() convert from canonical form to in-memory representation. 29 * 30 * 31 * Canonical instruction representation: 32 * 33 * ARM: 0xKKLLMMNN 34 * Thumb 16-bit: 0x0000KKLL, where KK < 0xE8 35 * Thumb 32-bit: 0xKKLLMMNN, where KK >= 0xE8 36 * 37 * There is no way to distinguish an ARM instruction in canonical representation 38 * from a Thumb instruction (just as these cannot be distinguished in memory). 39 * Where this distinction is important, it needs to be tracked separately. 40 * 41 * Note that values in the range 0x0000E800..0xE7FFFFFF intentionally do not 42 * represent any valid Thumb-2 instruction. For this range, 43 * __opcode_is_thumb32() and __opcode_is_thumb16() will both be false. 44 */ 45 46 #ifndef __ASSEMBLY__ 47 48 #include <linux/types.h> 49 #include <linux/swab.h> 50 51 #ifdef CONFIG_CPU_ENDIAN_BE8 52 #define __opcode_to_mem_arm(x) swab32(x) 53 #define __opcode_to_mem_thumb16(x) swab16(x) 54 #define __opcode_to_mem_thumb32(x) swahb32(x) 55 #else 56 #define __opcode_to_mem_arm(x) ((u32)(x)) 57 #define __opcode_to_mem_thumb16(x) ((u16)(x)) 58 #define __opcode_to_mem_thumb32(x) swahw32(x) 59 #endif 60 61 #define __mem_to_opcode_arm(x) __opcode_to_mem_arm(x) 62 #define __mem_to_opcode_thumb16(x) __opcode_to_mem_thumb16(x) 63 #define __mem_to_opcode_thumb32(x) __opcode_to_mem_thumb32(x) 64 65 /* Operations specific to Thumb opcodes */ 66 67 /* Instruction size checks: */ 68 #define __opcode_is_thumb32(x) ((u32)(x) >= 0xE8000000UL) 69 #define __opcode_is_thumb16(x) ((u32)(x) < 0xE800UL) 70 71 /* Operations to construct or split 32-bit Thumb instructions: */ 72 #define __opcode_thumb32_first(x) ((u16)((x) >> 16)) 73 #define __opcode_thumb32_second(x) ((u16)(x)) 74 #define __opcode_thumb32_compose(first, second) \ 75 (((u32)(u16)(first) << 16) | (u32)(u16)(second)) 76 77 #endif /* __ASSEMBLY__ */ 78 79 #endif /* __ASM_ARM_OPCODES_H */ 80