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X-Received-From: 2607:f8b0:4864:20::b44 Subject: [Qemu-devel] [RFC PATCH v4 24/75] target/i386: introduce operand for direct-only r/m field 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Many operands can only decode successfully if the ModR/M byte has the direct form (i.e. MOD=3D3). Capture this common aspect by introducing a special direct-only r/m field operand. Signed-off-by: Jan Bobek --- target/i386/translate.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/target/i386/translate.c b/target/i386/translate.c index b3b316d389..886f64a58f 100644 --- a/target/i386/translate.c +++ b/target/i386/translate.c @@ -4853,6 +4853,43 @@ INSNOP_FINALIZE(modrm_rm) { } =20 +/* + * modrm_rm_direct + * + * Equivalent of modrm_rm, but only decodes successfully if + * the ModR/M byte has the direct form (i.e. MOD=3D3). + */ +typedef insnop_arg_t(modrm_rm) insnop_arg_t(modrm_rm_direct); +typedef struct { + insnop_ctxt_t(modrm_rm) rm; +} insnop_ctxt_t(modrm_rm_direct); + +INSNOP_INIT(modrm_rm_direct) +{ + bool ret; + insnop_ctxt_t(modrm_mod) modctxt; + + ret =3D insnop_init(modrm_mod)(&modctxt, env, s, modrm, 0); + if (ret) { + const int mod =3D insnop_prepare(modrm_mod)(&modctxt, env, s, modr= m, 0); + if (mod =3D=3D 3) { + ret =3D insnop_init(modrm_rm)(&ctxt->rm, env, s, modrm, is_wri= te); + } else { + ret =3D false; + } + insnop_finalize(modrm_mod)(&modctxt, env, s, modrm, 0, mod); + } + return ret; +} +INSNOP_PREPARE(modrm_rm_direct) +{ + return insnop_prepare(modrm_rm)(&ctxt->rm, env, s, modrm, is_write); +} +INSNOP_FINALIZE(modrm_rm_direct) +{ + insnop_finalize(modrm_rm)(&ctxt->rm, env, s, modrm, is_write, arg); +} + static void gen_sse_ng(CPUX86State *env, DisasContext *s, int b) { enum { --=20 2.20.1