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[147.192.9.144]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-823187716ebsm8661487b3a.66.2026.01.25.23.05.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Jan 2026 23:05:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1769411137; x=1770015937; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5xCSzQWwTJF2/7eDxsKs1AgITtRoia5ffM8pnhI5abA=; b=naxPWNJPr54nlrTeMkWFOYXTayh/QLY2ozsf8XjLJkShgieXzm2At46tUHzZE6vgVL W8XI7qhkY4ONSGidMeu44OqSh76/eY9k0d0qLQOPtm5oJ20ZEW6ZurLzKwyoaB27PA0H 1dvNTzjyWBEJAHL7FFmS8iE/PRHpzTqqpzFYc8rkwDJ/WSGalTQIVrM3tqikyd4SlDpV 3UdFbJ8f7w1aw64/wuDZWrLsSzZONkk/mBH1kIRh3RUnhztWZeolPJFOKSLzGcHSMVqq 3lE+BqjFNQ4QD46TMVmCY1g8a+T4Hh7Vb9aigJST5p+mD5nGh/ZbodbYrgeMx4HY5kwZ 8hNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769411137; x=1770015937; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=5xCSzQWwTJF2/7eDxsKs1AgITtRoia5ffM8pnhI5abA=; b=eMZCAmVrfRxnjDzHTvu9CEa9P+oQ4sOa/X5FBprTryQKY0YapsX8ht/OhDuyqbN1VT 8+UQvPLPD2PqCRdu1s58heKq7+9lm2VBSw4ezpDk46uzeH1tRB92N/T3YxpPyyFoTeCh 1vueyHbhQ42hC+6Jc6TxWyvBE62oeuS2VV/mT53TJGd5E5oQuS8yhpmbRL5q98OIRYB3 vgs4q2XCtGaGSfoer0I+ISMLkEC9/9lp4AU1AuftwEJ5XxtBy8/OOSOEFLiVYG1X7fGC sXbg7kUPseAljWR8r6FeGeH+5oIEKHuaCbFIDGLCJqyY6LkdcS3AVBGI1Lqz2cAf/Cca Hjnw== X-Gm-Message-State: AOJu0YwfJB70ELSaZlv9oMwYjOCDObjjh31VfYc27Vzjp38ZmBjeHGI8 toQyrBN4YauusVxfq4zyJfPVKe4WW3xWgg/BNTFpMb94GZhLbBq2XPfubCo1RQ9h X-Gm-Gg: AZuq6aJlXUN5M6rtzOJdlZoeNMOOqLnsNXd0ADb0psV2GwV+HFKQRajnJk0uT2r0yQP sTt0ECJnK16DrjsAM1LKH9HUgd9k4xKQtVGZogt+H5PO81PlaPQws4N1qP/u9qEa9TyIwe9isHt p/V0sm9OeiIpCqmuOhMQFc6OOVSyuuTpVIced4wNTDrpBkRxY+hJqUCic7PZxjou4uhJc6deDK0 QsQaFpKUX0jo10rQjUbp6Ei+Ohr8bjtbTXZKUzBk9ayOQRNh7FHc+R6wh1LyemFR3LkTPAU5fFm vOxXYiK5Y3/lTF5knbF5lM0kJ2ndthRzsOdlzzmCinZJYSYR+rOgcncZmjJIRIqMbsHxPFnM09/ 6eQQFwK7TvIV5QK6DcCQbolumQgAF+MlL0jUa3+6aI5LLvikUTrk4FP0hGB2HGnJbpt4D2gsGni Ez+CI6u45LC+tvZSBkDhZlj9/YIgX4mWXr1yUR67RxNg== X-Received: by 2002:a17:902:f54b:b0:2a0:906b:db3e with SMTP id d9443c01a7336-2a8455b76e9mr29605695ad.27.1769411137276; Sun, 25 Jan 2026 23:05:37 -0800 (PST) From: Kohei Tokunaga To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Thomas Huth , Paolo Bonzini , Richard Henderson , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , WANG Xuerui , Aurelien Jarno , Huacai Chen , Jiaxun Yang , Aleksandar Rikalo , Palmer Dabbelt , Alistair Francis , Stefan Weil , Kohei Tokunaga , qemu-arm@nongnu.org, qemu-riscv@nongnu.org, Stefan Hajnoczi , Pierrick Bouvier Subject: [PATCH v4 20/33] tcg/wasm64: Add mb instruction Date: Mon, 26 Jan 2026 07:03:33 +0000 Message-ID: <27f082f262e67da490da8c00f35df78d13e62767.1769407033.git.ktokunaga.mail@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: 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=2607:f8b0:4864:20::634; envelope-from=ktokunaga.mail@gmail.com; helo=mail-pl1-x634.google.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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @gmail.com) X-ZM-MESSAGEID: 1769412199443154100 Content-Type: text/plain; charset="utf-8" This commit generates the mb operation. In Wasm, it uses the atomic.fence instruction as the fence operator [1]. TCI instruction is also generated in the same way as the original TCI backend using smp_mb(). [1] https://webassembly.github.io/threads/core/syntax/instructions.html#ato= mic-memory-instructions Signed-off-by: Kohei Tokunaga --- tcg/wasm64.c | 3 +++ tcg/wasm64/tcg-target.c.inc | 19 +++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/tcg/wasm64.c b/tcg/wasm64.c index bb2651c4dc..895ae062ee 100644 --- a/tcg/wasm64.c +++ b/tcg/wasm64.c @@ -573,6 +573,9 @@ static uintptr_t tcg_qemu_tb_exec_tci(CPUArchState *env= , const void *v_tb_ptr) taddr =3D regs[r1]; oi =3D regs[r2]; tci_qemu_st(env, taddr, regs[r0], oi, tb_ptr); + case INDEX_op_mb: + /* Ensure ordering for all kinds */ + smp_mb(); break; default: g_assert_not_reached(); diff --git a/tcg/wasm64/tcg-target.c.inc b/tcg/wasm64/tcg-target.c.inc index 0f51310700..d187dca970 100644 --- a/tcg/wasm64/tcg-target.c.inc +++ b/tcg/wasm64/tcg-target.c.inc @@ -1116,6 +1116,11 @@ static void tcg_out_op_r(TCGContext *s, TCGOpcode op= , TCGReg r0) tcg_out32(s, insn); } =20 +static void tcg_out_op_v(TCGContext *s, TCGOpcode op) +{ + tcg_out32(s, (uint8_t)op); +} + static void tcg_out_op_ri(TCGContext *s, TCGOpcode op, TCGReg r0, int32_t = i1) { tcg_insn_unit_tci insn =3D 0; @@ -1941,6 +1946,20 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s,= TCGLabelQemuLdst *l) g_assert_not_reached(); } =20 +static void tcg_out_mb(TCGContext *s, unsigned a0) +{ + tcg_out_op_v(s, INDEX_op_mb); + + /* + * Wasm's threading proposal provides atomic.fence instruction as the = fence + * operator. + * https://webassembly.github.io/threads/core/syntax/instructions.html= #atomic-memory-instructions + */ + tcg_wasm_out8(s, 0xfe); + tcg_wasm_out8(s, 0x03); + tcg_wasm_out8(s, 0x00); +} + static void tcg_out_tb_start(TCGContext *s) { init_sub_buf(); --=20 2.43.0