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Thu, 19 Oct 2023 03:47:08 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGBVFybQp7/FeV2G23g8d4VfAqd5ePqmgdthsIHMoexueLuZnectdgYZacH2SpeMQbRpyjTpA== X-Received: by 2002:a17:907:3687:b0:9bd:abb2:d4e0 with SMTP id bi7-20020a170907368700b009bdabb2d4e0mr1252285ejc.22.1697712427935; Thu, 19 Oct 2023 03:47:07 -0700 (PDT) Received: from [192.168.10.118] ([2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e]) by smtp.gmail.com with ESMTPSA id w19-20020a17090652d300b009ae05f9eab3sm3268970ejn.65.2023.10.19.03.47.06 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Oct 2023 03:47:07 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PATCH v2 10/19] target/i386: reintroduce debugging mechanism Date: Thu, 19 Oct 2023 12:46:39 +0200 Message-ID: <20231019104648.389942-11-pbonzini@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231019104648.389942-1-pbonzini@redhat.com> References: <20231019104648.389942-1-pbonzini@redhat.com> MIME-Version: 1.0 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 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Paolo Bonzini --- target/i386/tcg/decode-new.c.inc | 3 +++ target/i386/tcg/translate.c | 27 +++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc index 57a5014bc8a..2f614e2a6f0 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -1701,6 +1701,9 @@ static void disas_insn_new(DisasContext *s, CPUState *cpu, int b) X86DecodedInsn decode; X86DecodeFunc decode_func = decode_root; +#ifdef CONFIG_USER_ONLY + if (limit) { --limit; } +#endif s->has_modrm = false; next_byte: diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index 39b5752e780..080b56840da 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -2980,6 +2980,9 @@ static void gen_sty_env_A0(DisasContext *s, int offset, bool align) tcg_gen_qemu_st_i64(s->tmp1_i64, s->tmp0, mem_index, MO_LEUQ); } +static bool first = true; +static unsigned long limit; + #include "decode-new.h" #include "emit.c.inc" #include "decode-new.c.inc" @@ -3134,15 +3137,39 @@ static bool disas_insn(DisasContext *s, CPUState *cpu) prefixes = 0; + if (first) { + const char *env = getenv("QEMU_I386_LIMIT"); + limit = env ? atol(env) : -1; + first = false; + } + bool use_new = true; +#ifdef CONFIG_USER_ONLY + use_new &= limit > 0; +#endif + next_byte: s->prefix = prefixes; b = x86_ldub_code(env, s); /* Collect prefixes. */ switch (b) { default: +#ifndef CONFIG_USER_ONLY + use_new &= b <= limit; +#endif + if (use_new && 0) { + disas_insn_new(s, cpu, b); + return true; + } break; case 0x0f: b = x86_ldub_code(env, s) + 0x100; +#ifndef CONFIG_USER_ONLY + use_new &= b <= limit; +#endif + if (use_new && 0) { + disas_insn_new(s, cpu, b); + return true; + } break; case 0xf3: prefixes |= PREFIX_REPZ;