/* *  linux/arch/arm/kernel/opcodes.c * *  A32 condition code lookup feature moved from nwfpe/fpopcode.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/module.h>#include <asm/opcodes.h> #define ARM_OPCODE_CONDITION_UNCOND 0xf /* * condition code lookup table * index into the table is test code: EQ, NE, ... LT, GT, AL, NV * * bit position in short is condition code: NZCV */static const unsigned short cc_map[16] = {	0xF0F0,			/* EQ == Z set            */	0x0F0F,			/* NE                     */	0xCCCC,			/* CS == C set            */	0x3333,			/* CC                     */	0xFF00,			/* MI == N set            */	0x00FF,			/* PL                     */	0xAAAA,			/* VS == V set            */	0x5555,			/* VC                     */	0x0C0C,			/* HI == C set && Z clear */	0xF3F3,			/* LS == C clear || Z set */	0xAA55,			/* GE == (N==V)           */	0x55AA,			/* LT == (N!=V)           */	0x0A05,			/* GT == (!Z && (N==V))   */	0xF5FA,			/* LE == (Z || (N!=V))    */	0xFFFF,			/* AL always              */	0			/* NV                     */}; /* * Returns: * ARM_OPCODE_CONDTEST_FAIL   - if condition fails * ARM_OPCODE_CONDTEST_PASS   - if condition passes (including AL) * ARM_OPCODE_CONDTEST_UNCOND - if NV condition, or separate unconditional *                              opcode space from v5 onwards * * Code that tests whether a conditional instruction would pass its condition * check should check that return value == ARM_OPCODE_CONDTEST_PASS. * * Code that tests if a condition means that the instruction would be executed * (regardless of conditional or unconditional) should instead check that the * return value != ARM_OPCODE_CONDTEST_FAIL. */asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr){	u32 cc_bits  = opcode >> 28;	u32 psr_cond = psr >> 28;	unsigned int ret; 	if (cc_bits != ARM_OPCODE_CONDITION_UNCOND) {		if ((cc_map[cc_bits] >> (psr_cond)) & 1)			ret = ARM_OPCODE_CONDTEST_PASS;		else			ret = ARM_OPCODE_CONDTEST_FAIL;	} else {		ret = ARM_OPCODE_CONDTEST_UNCOND;	} 	return ret;}EXPORT_SYMBOL_GPL(arm_check_condition);