Function decode_fields32

arch/arm64/disassembler/decode_fields32.c:8–6345

#include "decode.h"

void decode_fields32(enum ENCODING enc, context *ctx, Instruction *instr)
{
	uint32_t insword = instr->insword;
	instr->encoding = enc; /* record current path of decoding */
	switch(enc) {
		case ENC_FMADD_H_FLOATDP3:
		case ENC_FMADD_S_FLOATDP3:
		case ENC_FMADD_D_FLOATDP3:
		case ENC_FMSUB_H_FLOATDP3:
		case ENC_FMSUB_S_FLOATDP3:
		case ENC_FMSUB_D_FLOATDP3:
		case ENC_FNMADD_H_FLOATDP3:
		case ENC_FNMADD_S_FLOATDP3:
		case ENC_FNMADD_D_FLOATDP3:
		case ENC_FNMSUB_H_FLOATDP3:
		case ENC_FNMSUB_S_FLOATDP3:
		case ENC_FNMSUB_D_FLOATDP3:
			// M=x|x|S=x|xxxxx|ftype=xx|o1=x|Rm=xxxxx|o0=x|Ra=xxxxx|Rn=xxxxx|Rd=xxxxx
			ctx->M = insword>>31;
			ctx->S = (insword>>29)&1;
			ctx->ftype = (insword>>22)&3;
			ctx->o1 = (insword>>21)&1;
			ctx->Rm = (insword>>16)&0x1f;
			ctx->o0 = (insword>>15)&1;
			ctx->Ra = (insword>>10)&0x1f;
			ctx->Rn = (insword>>5)&0x1f;
			ctx->Rd = insword&0x1f;
			break;
		case ENC_FCSEL_H_FLOATSEL:
		case ENC_FCSEL_S_FLOATSEL:
		case ENC_FCSEL_D_FLOATSEL:
			// M=x|x|S=x|xxxxx|ftype=xx|x|Rm=xxxxx|cond=xxxx|xx|Rn=xxxxx|Rd=xxxxx
			ctx->M = insword>>31;
			ctx->S = (insword>>29)&1;
			ctx->ftype = (insword>>22)&3;
			ctx->Rm = (insword>>16)&0x1f;
			ctx->cond = (insword>>12)&15;
			ctx->Rn = (insword>>5)&0x1f;
			ctx->Rd = insword&0x1f;
			break;
		case ENC_FCCMPE_H_FLOATCCMP:
		case ENC_FCCMPE_S_FLOATCCMP:
		case ENC_FCCMPE_D_FLOATCCMP:
		case ENC_FCCMP_H_FLOATCCMP:
		case ENC_FCCMP_S_FLOATCCMP:
		case ENC_FCCMP_D_FLOATCCMP:
			// M=x|x|S=x|xxxxx|ftype=xx|x|Rm=xxxxx|cond=xxxx|xx|Rn=xxxxx|op=x|nzcv=xxxx
			ctx->M = insword>>31;
			ctx->S = (insword>>29)&1;
			ctx->ftype = (insword>>22)&3;
			ctx->Rm = (insword>>16)&0x1f;
			ctx->cond = (insword>>12)&15;
			ctx->Rn = (insword>>5)&0x1f;
			ctx->op = (insword>>4)&1;
			ctx->nzcv = insword&15;
			break;
		case ENC_FCMPE_H_FLOATCMP:
		case ENC_FCMPE_HZ_FLOATCMP: