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Tue, 04 Jun 2024 00:18:50 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGQO0U2Meo9rcZ2moPnucu22v3XH/OB4DJUwrQep5TLlkvYphj1TyHZDUcQps26eCEEn8DF9A== X-Received: by 2002:a17:906:3488:b0:a69:24f:23e7 with SMTP id a640c23a62f3a-a69024f243dmr351150866b.19.1717485530236; Tue, 04 Jun 2024 00:18:50 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org Subject: [PATCH 04/11] target/i386: cleanup PAUSE helpers Date: Tue, 4 Jun 2024 09:18:26 +0200 Message-ID: <20240604071833.962574-5-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240604071833.962574-1-pbonzini@redhat.com> References: <20240604071833.962574-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717485567338100018 Content-Type: text/plain; charset="utf-8" Use decode.c's support for intercepts, doing the check in TCG-generated code rather than the helper. This is cleaner because it allows removing the eip_addend argument to helper_pause(), even though it adds a bit of bloat for opcode 0x90's new decoding function. Signed-off-by: Paolo Bonzini Reviewed-by: Richard Henderson --- target/i386/helper.h | 2 +- target/i386/tcg/helper-tcg.h | 1 - target/i386/tcg/misc_helper.c | 10 +--------- target/i386/tcg/sysemu/misc_helper.c | 2 +- target/i386/tcg/decode-new.c.inc | 15 ++++++++++++++- target/i386/tcg/emit.c.inc | 20 ++++++++------------ 6 files changed, 25 insertions(+), 25 deletions(-) diff --git a/target/i386/helper.h b/target/i386/helper.h index c244dbb4812..2f46cffabd8 100644 --- a/target/i386/helper.h +++ b/target/i386/helper.h @@ -53,7 +53,7 @@ DEF_HELPER_1(sysenter, void, env) DEF_HELPER_2(sysexit, void, env, int) DEF_HELPER_2(syscall, void, env, int) DEF_HELPER_2(sysret, void, env, int) -DEF_HELPER_FLAGS_2(pause, TCG_CALL_NO_WG, noreturn, env, int) +DEF_HELPER_FLAGS_1(pause, TCG_CALL_NO_WG, noreturn, env) DEF_HELPER_FLAGS_3(raise_interrupt, TCG_CALL_NO_WG, noreturn, env, int, in= t) DEF_HELPER_FLAGS_2(raise_exception, TCG_CALL_NO_WG, noreturn, env, int) DEF_HELPER_FLAGS_1(icebp, TCG_CALL_NO_WG, noreturn, env) diff --git a/target/i386/tcg/helper-tcg.h b/target/i386/tcg/helper-tcg.h index 6a5505e7b4c..43180b58314 100644 --- a/target/i386/tcg/helper-tcg.h +++ b/target/i386/tcg/helper-tcg.h @@ -91,7 +91,6 @@ extern const uint8_t parity_table[256]; =20 /* misc_helper.c */ void cpu_load_eflags(CPUX86State *env, int eflags, int update_mask); -G_NORETURN void do_pause(CPUX86State *env); =20 /* sysemu/svm_helper.c */ #ifndef CONFIG_USER_ONLY diff --git a/target/i386/tcg/misc_helper.c b/target/i386/tcg/misc_helper.c index b0f0f7b893b..8316d42ffcd 100644 --- a/target/i386/tcg/misc_helper.c +++ b/target/i386/tcg/misc_helper.c @@ -88,7 +88,7 @@ G_NORETURN void helper_rdpmc(CPUX86State *env) raise_exception_err(env, EXCP06_ILLOP, 0); } =20 -G_NORETURN void do_pause(CPUX86State *env) +G_NORETURN void helper_pause(CPUX86State *env) { CPUState *cs =3D env_cpu(env); =20 @@ -97,14 +97,6 @@ G_NORETURN void do_pause(CPUX86State *env) cpu_loop_exit(cs); } =20 -G_NORETURN void helper_pause(CPUX86State *env, int next_eip_addend) -{ - cpu_svm_check_intercept_param(env, SVM_EXIT_PAUSE, 0, GETPC()); - env->eip +=3D next_eip_addend; - - do_pause(env); -} - uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx) { if ((env->cr[4] & CR4_PKE_MASK) =3D=3D 0) { diff --git a/target/i386/tcg/sysemu/misc_helper.c b/target/i386/tcg/sysemu/= misc_helper.c index e41c88346cb..093cc2d0f90 100644 --- a/target/i386/tcg/sysemu/misc_helper.c +++ b/target/i386/tcg/sysemu/misc_helper.c @@ -547,7 +547,7 @@ G_NORETURN void helper_mwait(CPUX86State *env, int next= _eip_addend) =20 /* XXX: not complete but not completely erroneous */ if (cs->cpu_index !=3D 0 || CPU_NEXT(cs) !=3D NULL) { - do_pause(env); + helper_pause(env); } else { helper_hlt(env); } diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.= c.inc index 376d2bdabe1..c2d8da8d14e 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -1359,6 +1359,19 @@ static void decode_group11(DisasContext *s, CPUX86St= ate *env, X86OpEntry *entry, } } =20 +static void decode_90(DisasContext *s, CPUX86State *env, X86OpEntry *entry= , uint8_t *b) +{ + static X86OpEntry pause =3D X86_OP_ENTRY0(PAUSE, svm(PAUSE)); + static X86OpEntry nop =3D X86_OP_ENTRY0(NOP); + static X86OpEntry xchg_ax =3D X86_OP_ENTRY2(XCHG, 0,v, LoBits,v); + + if (REX_B(s)) { + *entry =3D xchg_ax; + } else { + *entry =3D (s->prefix & PREFIX_REPZ) ? pause : nop; + } +} + static const X86OpEntry opcodes_root[256] =3D { [0x00] =3D X86_OP_ENTRY2(ADD, E,b, G,b, lock), [0x01] =3D X86_OP_ENTRY2(ADD, E,v, G,v, lock), @@ -1441,7 +1454,7 @@ static const X86OpEntry opcodes_root[256] =3D { [0x86] =3D X86_OP_ENTRY2(XCHG, E,b, G,b, xchg), [0x87] =3D X86_OP_ENTRY2(XCHG, E,v, G,v, xchg), =20 - [0x90] =3D X86_OP_ENTRY2(XCHG, 0,v, LoBits,v), + [0x90] =3D X86_OP_GROUP0(90), [0x91] =3D X86_OP_ENTRY2(XCHG, 0,v, LoBits,v), [0x92] =3D X86_OP_ENTRY2(XCHG, 0,v, LoBits,v), [0x93] =3D X86_OP_ENTRY2(XCHG, 0,v, LoBits,v), diff --git a/target/i386/tcg/emit.c.inc b/target/i386/tcg/emit.c.inc index 2e94e8ec56f..f90f3d3c589 100644 --- a/target/i386/tcg/emit.c.inc +++ b/target/i386/tcg/emit.c.inc @@ -2350,6 +2350,14 @@ static void gen_PANDN(DisasContext *s, CPUX86State *= env, X86DecodedInsn *decode) decode->op[1].offset, vec_len, vec_len); } =20 +static void gen_PAUSE(DisasContext *s, CPUX86State *env, X86DecodedInsn *d= ecode) +{ + gen_update_cc_op(s); + gen_update_eip_next(s); + gen_helper_pause(tcg_env); + s->base.is_jmp =3D DISAS_NORETURN; +} + static void gen_PCMPESTRI(DisasContext *s, CPUX86State *env, X86DecodedIns= n *decode) { TCGv_i32 imm =3D tcg_constant8u_i32(decode->immediate); @@ -4014,18 +4022,6 @@ static void gen_WAIT(DisasContext *s, CPUX86State *e= nv, X86DecodedInsn *decode) =20 static void gen_XCHG(DisasContext *s, CPUX86State *env, X86DecodedInsn *de= code) { - if (decode->b =3D=3D 0x90 && !REX_B(s)) { - if (s->prefix & PREFIX_REPZ) { - gen_update_cc_op(s); - gen_update_eip_cur(s); - gen_helper_pause(tcg_env, cur_insn_len_i32(s)); - s->base.is_jmp =3D DISAS_NORETURN; - } - /* No writeback. */ - decode->op[0].unit =3D X86_OP_SKIP; - return; - } - if (s->prefix & PREFIX_LOCK) { tcg_gen_atomic_xchg_tl(s->T0, s->A0, s->T1, s->mem_index, decode->op[0].ot | MO_LE); --=20 2.45.1