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X-Received-From: 2607:f8b0:4864:20::b43 Subject: [Qemu-devel] [RFC PATCH v4 23/75] target/i386: introduce operands for decoding modrm fields X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jan Bobek , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The old code uses bitshifts and bitwise-and all over the place for decoding ModR/M fields. Avoid doing that by introducing proper decoding operands. Signed-off-by: Jan Bobek --- target/i386/translate.c | 62 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/target/i386/translate.c b/target/i386/translate.c index a0a9f64ff3..b3b316d389 100644 --- a/target/i386/translate.c +++ b/target/i386/translate.c @@ -4791,6 +4791,68 @@ INSNOP_FINALIZE(modrm) { } +/* + * modrm_mod + * + * Operand whose value is the MOD field of the ModR/M byte. + */ +typedef int insnop_arg_t(modrm_mod); +typedef struct {} insnop_ctxt_t(modrm_mod); + +INSNOP_INIT(modrm_mod) +{ + return true; +} +INSNOP_PREPARE(modrm_mod) +{ + return (modrm >> 6) & 3; +} +INSNOP_FINALIZE(modrm_mod) +{ +} + +/* + * modrm_reg + * + * Operand whose value is the REG field of the ModR/M byte, extended + * with the REX.R bit if REX prefix is present. + */ +typedef int insnop_arg_t(modrm_reg); +typedef struct {} insnop_ctxt_t(modrm_reg); + +INSNOP_INIT(modrm_reg) +{ + return true; +} +INSNOP_PREPARE(modrm_reg) +{ + return ((modrm >> 3) & 7) | REX_R(s); +} +INSNOP_FINALIZE(modrm_reg) +{ +} + +/* + * modrm_rm + * + * Operand whose value is the RM field of the ModR/M byte, extended + * with the REX.B bit if REX prefix is present. + */ +typedef int insnop_arg_t(modrm_rm); +typedef struct {} insnop_ctxt_t(modrm_rm); + +INSNOP_INIT(modrm_rm) +{ + return true; +} +INSNOP_PREPARE(modrm_rm) +{ + return (modrm & 7) | REX_B(s); +} +INSNOP_FINALIZE(modrm_rm) +{ +} + static void gen_sse_ng(CPUX86State *env, DisasContext *s, int b) { enum { -- 2.20.1