From nobody Fri Oct 3 19:12:06 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B87A42853E9 for ; Tue, 26 Aug 2025 06:40:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756190412; cv=none; b=rYj+gCG6+3p5rvv1jz3qD4FuXPTSjj0/tCw7Sdxn+6asrXEIrOi9UlfqkGQtZdH6iidCdFz8W8+K1OQ8z1WnLrI2Qy2INIp4mG6DfP1sePU8g3HCxTbWr1Mcor0cbV/AgjzFYHHgQI8OB0Lv7F0592G/l9MHdJjf2MGMZtU05v8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756190412; c=relaxed/simple; bh=j5zAOK6fBSRN91+APJen8U5aoH29TE+tQ6Bm3G+v6Jc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=QuWYk6vyU62XfZg1SXPuoy7ktkAkeDXmgpjiWWMAn8dAnFTPpB5X/BxiZk0pe3zEYQpuA7Gbn/OSsbqUJbDM0fnuHPsyy9ZUxOsWgbtWFBMH4j+K6npPBj72xhWG5zfoQX8AuMBLeniDSDYYWcpHmPMlWaUiGEEtTmZTK6Tbs3o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8Cx6tHCVq1ozEADAA--.6220S3; Tue, 26 Aug 2025 14:40:02 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by front1 (Coremail) with SMTP id qMiowJBxTMHBVq1o8mdpAA--.11124S2; Tue, 26 Aug 2025 14:40:02 +0800 (CST) From: Tiezhu Yang To: Huacai Chen Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] LoongArch: Handle newly added llsc instructions for probes Date: Tue, 26 Aug 2025 14:39:56 +0800 Message-ID: <20250826063956.6950-1-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.42.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJBxTMHBVq1o8mdpAA--.11124S2 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBj93XoW7ZF13AF45JF1rWryxWw4fCrX_yoW8CFy7pF Zrurn5GrWUWrn3ArnrJan29r45AF1kKrW2qFnIk34xCr1aqF17twn7GF1DuFyDK398GF40 gFW5Xryaqa15JacCm3ZEXasCq-sJn29KB7ZKAUJUUUU5529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUyEb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1Y6r17M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCEc2xF0cIa020Ex4CE44I27wAqx4 xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_JF0_Jw1lYx0Ex4A2jsIE14v2 6r1j6r4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwCF04k20xvY0x0EwI xGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480 Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jrv_JF1lIxkGc2Ij64vIr41lIxAIcVC0I7 IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF04k2 6cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxV AFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7IU82g43UUUUU== Content-Type: text/plain; charset="utf-8" The atomic instructions sc.q, llacq.{w/d}, screl.{w/d} were newly added in the LoongArch Reference Manual v1.10, it is necessary to handle them in insns_not_supported() to avoid putting a breakpoint in the middle of a ll/sc atomic sequence, otherwise it will loop forever for kprobes and uprobes. Signed-off-by: Tiezhu Yang --- arch/loongarch/include/asm/inst.h | 5 +++++ arch/loongarch/kernel/inst.c | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm= /inst.h index 277d2140676b..55e64a12a124 100644 --- a/arch/loongarch/include/asm/inst.h +++ b/arch/loongarch/include/asm/inst.h @@ -77,6 +77,10 @@ enum reg2_op { iocsrwrh_op =3D 0x19205, iocsrwrw_op =3D 0x19206, iocsrwrd_op =3D 0x19207, + llacqw_op =3D 0xe15e0, + screlw_op =3D 0xe15e1, + llacqd_op =3D 0xe15e2, + screld_op =3D 0xe15e3, }; =20 enum reg2i5_op { @@ -189,6 +193,7 @@ enum reg3_op { fldxd_op =3D 0x7068, fstxs_op =3D 0x7070, fstxd_op =3D 0x7078, + scq_op =3D 0x70ae, amswapw_op =3D 0x70c0, amswapd_op =3D 0x70c1, amaddw_op =3D 0x70c2, diff --git a/arch/loongarch/kernel/inst.c b/arch/loongarch/kernel/inst.c index 72ecfed29d55..4026edea9bdd 100644 --- a/arch/loongarch/kernel/inst.c +++ b/arch/loongarch/kernel/inst.c @@ -141,6 +141,18 @@ bool insns_not_supported(union loongarch_instruction i= nsn) case amswapw_op ... ammindbdu_op: pr_notice("atomic memory access instructions are not supported\n"); return true; + case scq_op: + pr_notice("sc.q instruction is not supported\n"); + return true; + } + + switch (insn.reg2_format.opcode) { + case llacqw_op: + case llacqd_op: + case screlw_op: + case screld_op: + pr_notice("llacq and screl instructions are not supported\n"); + return true; } =20 switch (insn.reg2i14_format.opcode) { --=20 2.42.0