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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-224109e99dfsm79230515ad.91.2025.03.10.08.13.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Mar 2025 08:14:02 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Samuel Holland Subject: [PATCH v3 09/17] riscv: misaligned: factorize trap handling Date: Mon, 10 Mar 2025 16:12:16 +0100 Message-ID: <20250310151229.2365992-10-cleger@rivosinc.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250310151229.2365992-1-cleger@rivosinc.com> References: <20250310151229.2365992-1-cleger@rivosinc.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit misaligned accesses traps are not nmi and should be treated as normal one using irqentry_enter()/exit(). Since both load/store and user/kernel should use almost the same path and that we are going to add some code around that, factorize it. Signed-off-by: Clément Léger --- arch/riscv/kernel/traps.c | 49 ++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 29 deletions(-) diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 8ff8e8b36524..55d9f3450398 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -198,47 +198,38 @@ asmlinkage __visible __trap_section void do_trap_insn_illegal(struct pt_regs *re DO_ERROR_INFO(do_trap_load_fault, SIGSEGV, SEGV_ACCERR, "load access fault"); -asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) +enum misaligned_access_type { + MISALIGNED_STORE, + MISALIGNED_LOAD, +}; + +static void do_trap_misaligned(struct pt_regs *regs, enum misaligned_access_type type) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); + irqentry_state_t state = irqentry_enter(regs); + if (type == MISALIGNED_LOAD) { if (handle_misaligned_load(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_exit_to_user_mode(regs); + "Oops - load address misaligned"); } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_load(regs)) + if (handle_misaligned_store(regs)) do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - load address misaligned"); - - irqentry_nmi_exit(regs, state); + "Oops - store (or AMO) address misaligned"); } + + irqentry_exit(regs, state); } -asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +asmlinkage __visible __trap_section void do_trap_load_misaligned(struct pt_regs *regs) { - if (user_mode(regs)) { - irqentry_enter_from_user_mode(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); - - irqentry_exit_to_user_mode(regs); - } else { - irqentry_state_t state = irqentry_nmi_enter(regs); - - if (handle_misaligned_store(regs)) - do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc, - "Oops - store (or AMO) address misaligned"); + do_trap_misaligned(regs, MISALIGNED_LOAD); +} - irqentry_nmi_exit(regs, state); - } +asmlinkage __visible __trap_section void do_trap_store_misaligned(struct pt_regs *regs) +{ + do_trap_misaligned(regs, MISALIGNED_STORE); } + DO_ERROR_INFO(do_trap_store_fault, SIGSEGV, SEGV_ACCERR, "store (or AMO) access fault"); DO_ERROR_INFO(do_trap_ecall_s, -- 2.47.2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8677C35FF3 for ; Mon, 10 Mar 2025 15:47:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-224109e99dfsm79230515ad.91.2025.03.10.08.13.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Mar 2025 08:14:02 -0700 (PDT) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: Paul Walmsley , Palmer Dabbelt , Anup Patel , Atish Patra , Shuah Khan , Jonathan Corbet , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Samuel Holland Subject: [PATCH v3 09/17] riscv: misaligned: factorize trap handling Date: Mon, 10 Mar 2025 16:12:16 +0100 Message-ID: <20250310151229.2365992-10-cleger@rivosinc.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250310151229.2365992-1-cleger@rivosinc.com> References: <20250310151229.2365992-1-cleger@rivosinc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250310_081403_262070_2B9397AA X-CRM114-Status: GOOD ( 10.54 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org bWlzYWxpZ25lZCBhY2Nlc3NlcyB0cmFwcyBhcmUgbm90IG5taSBhbmQgc2hvdWxkIGJlIHRyZWF0 ZWQgYXMgbm9ybWFsCm9uZSB1c2luZyBpcnFlbnRyeV9lbnRlcigpL2V4aXQoKS4gU2luY2UgYm90 aCBsb2FkL3N0b3JlIGFuZCB1c2VyL2tlcm5lbApzaG91bGQgdXNlIGFsbW9zdCB0aGUgc2FtZSBw YXRoIGFuZCB0aGF0IHdlIGFyZSBnb2luZyB0byBhZGQgc29tZSBjb2RlCmFyb3VuZCB0aGF0LCBm YWN0b3JpemUgaXQuCgpTaWduZWQtb2ZmLWJ5OiBDbMOpbWVudCBMw6lnZXIgPGNsZWdlckByaXZv c2luYy5jb20+Ci0tLQogYXJjaC9yaXNjdi9rZXJuZWwvdHJhcHMuYyB8IDQ5ICsrKysrKysrKysr KysrKystLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQogMSBmaWxlIGNoYW5nZWQsIDIwIGluc2VydGlv bnMoKyksIDI5IGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2FyY2gvcmlzY3Yva2VybmVsL3Ry YXBzLmMgYi9hcmNoL3Jpc2N2L2tlcm5lbC90cmFwcy5jCmluZGV4IDhmZjhlOGIzNjUyNC4uNTVk OWYzNDUwMzk4IDEwMDY0NAotLS0gYS9hcmNoL3Jpc2N2L2tlcm5lbC90cmFwcy5jCisrKyBiL2Fy Y2gvcmlzY3Yva2VybmVsL3RyYXBzLmMKQEAgLTE5OCw0NyArMTk4LDM4IEBAIGFzbWxpbmthZ2Ug X192aXNpYmxlIF9fdHJhcF9zZWN0aW9uIHZvaWQgZG9fdHJhcF9pbnNuX2lsbGVnYWwoc3RydWN0 IHB0X3JlZ3MgKnJlCiBET19FUlJPUl9JTkZPKGRvX3RyYXBfbG9hZF9mYXVsdCwKIAlTSUdTRUdW LCBTRUdWX0FDQ0VSUiwgImxvYWQgYWNjZXNzIGZhdWx0Iik7CiAKLWFzbWxpbmthZ2UgX192aXNp YmxlIF9fdHJhcF9zZWN0aW9uIHZvaWQgZG9fdHJhcF9sb2FkX21pc2FsaWduZWQoc3RydWN0IHB0 X3JlZ3MgKnJlZ3MpCitlbnVtIG1pc2FsaWduZWRfYWNjZXNzX3R5cGUgeworCU1JU0FMSUdORURf U1RPUkUsCisJTUlTQUxJR05FRF9MT0FELAorfTsKKworc3RhdGljIHZvaWQgZG9fdHJhcF9taXNh bGlnbmVkKHN0cnVjdCBwdF9yZWdzICpyZWdzLCBlbnVtIG1pc2FsaWduZWRfYWNjZXNzX3R5cGUg dHlwZSkKIHsKLQlpZiAodXNlcl9tb2RlKHJlZ3MpKSB7Ci0JCWlycWVudHJ5X2VudGVyX2Zyb21f dXNlcl9tb2RlKHJlZ3MpOworCWlycWVudHJ5X3N0YXRlX3Qgc3RhdGUgPSBpcnFlbnRyeV9lbnRl cihyZWdzKTsKIAorCWlmICh0eXBlID09ICBNSVNBTElHTkVEX0xPQUQpIHsKIAkJaWYgKGhhbmRs ZV9taXNhbGlnbmVkX2xvYWQocmVncykpCiAJCQlkb190cmFwX2Vycm9yKHJlZ3MsIFNJR0JVUywg QlVTX0FEUkFMTiwgcmVncy0+ZXBjLAotCQkJICAgICAgIk9vcHMgLSBsb2FkIGFkZHJlc3MgbWlz YWxpZ25lZCIpOwotCi0JCWlycWVudHJ5X2V4aXRfdG9fdXNlcl9tb2RlKHJlZ3MpOworCQkJCSAg ICAgICJPb3BzIC0gbG9hZCBhZGRyZXNzIG1pc2FsaWduZWQiKTsKIAl9IGVsc2UgewotCQlpcnFl bnRyeV9zdGF0ZV90IHN0YXRlID0gaXJxZW50cnlfbm1pX2VudGVyKHJlZ3MpOwotCi0JCWlmICho YW5kbGVfbWlzYWxpZ25lZF9sb2FkKHJlZ3MpKQorCQlpZiAoaGFuZGxlX21pc2FsaWduZWRfc3Rv cmUocmVncykpCiAJCQlkb190cmFwX2Vycm9yKHJlZ3MsIFNJR0JVUywgQlVTX0FEUkFMTiwgcmVn cy0+ZXBjLAotCQkJICAgICAgIk9vcHMgLSBsb2FkIGFkZHJlc3MgbWlzYWxpZ25lZCIpOwotCi0J CWlycWVudHJ5X25taV9leGl0KHJlZ3MsIHN0YXRlKTsKKwkJCQkgICAgICAiT29wcyAtIHN0b3Jl IChvciBBTU8pIGFkZHJlc3MgbWlzYWxpZ25lZCIpOwogCX0KKworCWlycWVudHJ5X2V4aXQocmVn cywgc3RhdGUpOwogfQogCi1hc21saW5rYWdlIF9fdmlzaWJsZSBfX3RyYXBfc2VjdGlvbiB2b2lk IGRvX3RyYXBfc3RvcmVfbWlzYWxpZ25lZChzdHJ1Y3QgcHRfcmVncyAqcmVncykKK2FzbWxpbmth Z2UgX192aXNpYmxlIF9fdHJhcF9zZWN0aW9uIHZvaWQgZG9fdHJhcF9sb2FkX21pc2FsaWduZWQo c3RydWN0IHB0X3JlZ3MgKnJlZ3MpCiB7Ci0JaWYgKHVzZXJfbW9kZShyZWdzKSkgewotCQlpcnFl bnRyeV9lbnRlcl9mcm9tX3VzZXJfbW9kZShyZWdzKTsKLQotCQlpZiAoaGFuZGxlX21pc2FsaWdu ZWRfc3RvcmUocmVncykpCi0JCQlkb190cmFwX2Vycm9yKHJlZ3MsIFNJR0JVUywgQlVTX0FEUkFM TiwgcmVncy0+ZXBjLAotCQkJCSJPb3BzIC0gc3RvcmUgKG9yIEFNTykgYWRkcmVzcyBtaXNhbGln bmVkIik7Ci0KLQkJaXJxZW50cnlfZXhpdF90b191c2VyX21vZGUocmVncyk7Ci0JfSBlbHNlIHsK LQkJaXJxZW50cnlfc3RhdGVfdCBzdGF0ZSA9IGlycWVudHJ5X25taV9lbnRlcihyZWdzKTsKLQot CQlpZiAoaGFuZGxlX21pc2FsaWduZWRfc3RvcmUocmVncykpCi0JCQlkb190cmFwX2Vycm9yKHJl Z3MsIFNJR0JVUywgQlVTX0FEUkFMTiwgcmVncy0+ZXBjLAotCQkJCSJPb3BzIC0gc3RvcmUgKG9y IEFNTykgYWRkcmVzcyBtaXNhbGlnbmVkIik7CisJZG9fdHJhcF9taXNhbGlnbmVkKHJlZ3MsIE1J U0FMSUdORURfTE9BRCk7Cit9CiAKLQkJaXJxZW50cnlfbm1pX2V4aXQocmVncywgc3RhdGUpOwot CX0KK2FzbWxpbmthZ2UgX192aXNpYmxlIF9fdHJhcF9zZWN0aW9uIHZvaWQgZG9fdHJhcF9zdG9y ZV9taXNhbGlnbmVkKHN0cnVjdCBwdF9yZWdzICpyZWdzKQoreworCWRvX3RyYXBfbWlzYWxpZ25l ZChyZWdzLCBNSVNBTElHTkVEX1NUT1JFKTsKIH0KKwogRE9fRVJST1JfSU5GTyhkb190cmFwX3N0 b3JlX2ZhdWx0LAogCVNJR1NFR1YsIFNFR1ZfQUNDRVJSLCAic3RvcmUgKG9yIEFNTykgYWNjZXNz IGZhdWx0Iik7CiBET19FUlJPUl9JTkZPKGRvX3RyYXBfZWNhbGxfcywKLS0gCjIuNDcuMgoKCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2 IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0 cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK