From nobody Sat Apr 11 07:56:14 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0DB9C00140 for ; Mon, 15 Aug 2022 03:21:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230073AbiHODVG (ORCPT ); Sun, 14 Aug 2022 23:21:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34002 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230064AbiHODU7 (ORCPT ); Sun, 14 Aug 2022 23:20:59 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D09CFA1B2 for ; Sun, 14 Aug 2022 20:20:57 -0700 (PDT) Received: from dggemv704-chm.china.huawei.com (unknown [172.30.72.55]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4M5fdn68zNzGpKP; Mon, 15 Aug 2022 11:19:25 +0800 (CST) Received: from kwepemm600017.china.huawei.com (7.193.23.234) by dggemv704-chm.china.huawei.com (10.3.19.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 15 Aug 2022 11:20:55 +0800 Received: from localhost.localdomain (10.175.112.125) by kwepemm600017.china.huawei.com (7.193.23.234) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 15 Aug 2022 11:20:54 +0800 From: Tong Tiangen To: Paul Walmsley , Palmer Dabbelt , Palmer Dabbelt , Albert Ou , CC: , , "Tong Tiangen" , , Guohanjun Subject: [PATCH -next v2 2/2] riscv: extable: add new extable type EX_TYPE_KACCESS_ERR_ZERO support Date: Mon, 15 Aug 2022 03:20:25 +0000 Message-ID: <20220815032025.2685516-3-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220815032025.2685516-1-tongtiangen@huawei.com> References: <20220815032025.2685516-1-tongtiangen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Currently, The extable type EX_TYPE_UACCESS_ERR_ZERO is used by __get/put_kernel_nofault(), but those helpers are not uaccess type, so we add a new extable type EX_TYPE_KACCESS_ERR_ZERO which can be used by __get/put_kernel_no_fault(). Only refactor code without any functional changes. Signed-off-by: Tong Tiangen --- arch/riscv/include/asm/asm-extable.h | 12 ++ arch/riscv/include/asm/uaccess.h | 160 +++++++++++++-------------- arch/riscv/mm/extable.c | 1 + 3 files changed, 93 insertions(+), 80 deletions(-) diff --git a/arch/riscv/include/asm/asm-extable.h b/arch/riscv/include/asm/= asm-extable.h index 14be0673f5b5..73c70098a9c8 100644 --- a/arch/riscv/include/asm/asm-extable.h +++ b/arch/riscv/include/asm/asm-extable.h @@ -6,6 +6,7 @@ #define EX_TYPE_FIXUP 1 #define EX_TYPE_BPF 2 #define EX_TYPE_UACCESS_ERR_ZERO 3 +#define EX_TYPE_KACCESS_ERR_ZERO 4 =20 #ifdef __ASSEMBLY__ =20 @@ -57,9 +58,20 @@ EX_DATA_REG(ZERO, zero) \ ")") =20 +#define _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) \ + __DEFINE_ASM_GPR_NUMS \ + __ASM_EXTABLE_RAW(#insn, #fixup, \ + __stringify(EX_TYPE_KACCESS_ERR_ZERO), \ + "(" \ + EX_DATA_REG(ERR, err) " | " \ + EX_DATA_REG(ZERO, zero) \ + ")") + #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \ _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) =20 +#define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \ + _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) #endif /* __ASSEMBLY__ */ =20 #endif /* __ASM_ASM_EXTABLE_H */ diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uacc= ess.h index 1370da055b44..a79af147636e 100644 --- a/arch/riscv/include/asm/uaccess.h +++ b/arch/riscv/include/asm/uaccess.h @@ -50,62 +50,62 @@ * call. */ =20 -#define __get_mem_asm(insn, x, ptr, err) \ -do { \ - __typeof__(x) __x; \ - __asm__ __volatile__ ( \ - "1:\n" \ - " " insn " %1, %2\n" \ - "2:\n" \ - _ASM_EXTABLE_UACCESS_ERR_ZERO(1b, 2b, %0, %1) \ - : "+r" (err), "=3D&r" (__x) \ - : "m" (*(ptr))); \ - (x) =3D __x; \ +#define __get_mem_asm(insn, x, ptr, err, type) \ +do { \ + __typeof__(x) __x; \ + __asm__ __volatile__ ( \ + "1:\n" \ + " " insn " %1, %2\n" \ + "2:\n" \ + _ASM_EXTABLE_##type##ACCESS_ERR_ZERO(1b, 2b, %0, %1) \ + : "+r" (err), "=3D&r" (__x) \ + : "m" (*(ptr))); \ + (x) =3D __x; \ } while (0) =20 #ifdef CONFIG_64BIT -#define __get_mem_8(x, ptr, err) \ - __get_mem_asm("ld", x, ptr, err) +#define __get_mem_8(x, ptr, err, type) \ + __get_mem_asm("ld", x, ptr, err, type) #else /* !CONFIG_64BIT */ -#define __get_mem_8(x, ptr, err) \ -do { \ - u32 *__ptr =3D (u32 *)(ptr); \ - u32 __lo, __hi; \ - __asm__ __volatile__ ( \ - "1:\n" \ - " lw %1, %3\n" \ - "2:\n" \ - " lw %2, %4\n" \ - "3:\n" \ - _ASM_EXTABLE_UACCESS_ERR_ZERO(1b, 3b, %0, %1) \ - _ASM_EXTABLE_UACCESS_ERR_ZERO(2b, 3b, %0, %1) \ - : "+r" (err), "=3D&r" (__lo), "=3Dr" (__hi) \ - : "m" (__ptr[__LSW]), "m" (__ptr[__MSW])); \ - if (err) \ - __hi =3D 0; \ - (x) =3D (__typeof__(x))((__typeof__((x)-(x)))( \ - (((u64)__hi << 32) | __lo))); \ +#define __get_mem_8(x, ptr, err, type) \ +do { \ + u32 *__ptr =3D (u32 *)(ptr); \ + u32 __lo, __hi; \ + __asm__ __volatile__ ( \ + "1:\n" \ + " lw %1, %3\n" \ + "2:\n" \ + " lw %2, %4\n" \ + "3:\n" \ + _ASM_EXTABLE_##type##ACCESS_ERR_ZERO(1b, 3b, %0, %1) \ + _ASM_EXTABLE_##type##ACCESS_ERR_ZERO(2b, 3b, %0, %1) \ + : "+r" (err), "=3D&r" (__lo), "=3Dr" (__hi) \ + : "m" (__ptr[__LSW]), "m" (__ptr[__MSW])); \ + if (err) \ + __hi =3D 0; \ + (x) =3D (__typeof__(x))((__typeof__((x)-(x)))( \ + (((u64)__hi << 32) | __lo))); \ } while (0) #endif /* CONFIG_64BIT */ =20 -#define __get_mem_nocheck(x, __gu_ptr, __gu_err) \ -do { \ - switch (sizeof(*__gu_ptr)) { \ - case 1: \ - __get_mem_asm("lb", (x), __gu_ptr, __gu_err); \ - break; \ - case 2: \ - __get_mem_asm("lh", (x), __gu_ptr, __gu_err); \ - break; \ - case 4: \ - __get_mem_asm("lw", (x), __gu_ptr, __gu_err); \ - break; \ - case 8: \ - __get_mem_8((x), __gu_ptr, __gu_err); \ - break; \ - default: \ - BUILD_BUG(); \ - } \ +#define __get_mem_nocheck(x, __gu_ptr, __gu_err, type) \ +do { \ + switch (sizeof(*__gu_ptr)) { \ + case 1: \ + __get_mem_asm("lb", (x), __gu_ptr, __gu_err, type); \ + break; \ + case 2: \ + __get_mem_asm("lh", (x), __gu_ptr, __gu_err, type); \ + break; \ + case 4: \ + __get_mem_asm("lw", (x), __gu_ptr, __gu_err, type); \ + break; \ + case 8: \ + __get_mem_8((x), __gu_ptr, __gu_err, type); \ + break; \ + default: \ + BUILD_BUG(); \ + } \ } while (0) =20 /** @@ -136,7 +136,7 @@ do { \ __chk_user_ptr(__gu_ptr); \ \ __enable_user_access(); \ - __get_mem_nocheck(x, __gu_ptr, __gu_err); \ + __get_mem_nocheck(x, __gu_ptr, __gu_err, U); \ __disable_user_access(); \ \ __gu_err; \ @@ -163,28 +163,28 @@ do { \ ({ \ const __typeof__(*(ptr)) __user *__p =3D (ptr); \ might_fault(); \ - access_ok(__p, sizeof(*__p)) ? \ + access_ok(__p, sizeof(*__p)) ? \ __get_user((x), __p) : \ ((x) =3D 0, -EFAULT); \ }) =20 -#define __put_mem_asm(insn, x, ptr, err) \ +#define __put_mem_asm(insn, x, ptr, err, type) \ do { \ __typeof__(*(ptr)) __x =3D x; \ __asm__ __volatile__ ( \ "1:\n" \ " " insn " %z2, %1\n" \ "2:\n" \ - _ASM_EXTABLE_UACCESS_ERR(1b, 2b, %0) \ + _ASM_EXTABLE_##type##ACCESS_ERR(1b, 2b, %0) \ : "+r" (err), "=3Dm" (*(ptr)) \ : "rJ" (__x)); \ } while (0) =20 #ifdef CONFIG_64BIT -#define __put_mem_8(x, ptr, err) \ - __put_mem_asm("sd", x, ptr, err) +#define __put_mem_8(x, ptr, err, type) \ + __put_mem_asm("sd", x, ptr, err, type) #else /* !CONFIG_64BIT */ -#define __put_mem_8(x, ptr, err) \ +#define __put_mem_8(x, ptr, err, type) \ do { \ u32 *__ptr =3D (u32 *)(ptr); \ u64 __x =3D (__typeof__((x)-(x)))(x); \ @@ -194,8 +194,8 @@ do { \ "2:\n" \ " sw %z4, %2\n" \ "3:\n" \ - _ASM_EXTABLE_UACCESS_ERR(1b, 3b, %0) \ - _ASM_EXTABLE_UACCESS_ERR(2b, 3b, %0) \ + _ASM_EXTABLE_##type##ACCESS_ERR(1b, 3b, %0) \ + _ASM_EXTABLE_##type##ACCESS_ERR(2b, 3b, %0) \ : "+r" (err), \ "=3Dm" (__ptr[__LSW]), \ "=3Dm" (__ptr[__MSW]) \ @@ -203,24 +203,24 @@ do { \ } while (0) #endif /* CONFIG_64BIT */ =20 -#define __put_mem_nocheck(x, __gu_ptr, __pu_err) \ -do { \ - switch (sizeof(*__gu_ptr)) { \ - case 1: \ - __put_mem_asm("sb", (x), __gu_ptr, __pu_err); \ - break; \ - case 2: \ - __put_mem_asm("sh", (x), __gu_ptr, __pu_err); \ - break; \ - case 4: \ - __put_mem_asm("sw", (x), __gu_ptr, __pu_err); \ - break; \ - case 8: \ - __put_mem_8((x), __gu_ptr, __pu_err); \ - break; \ - default: \ - BUILD_BUG(); \ - } \ +#define __put_mem_nocheck(x, __gu_ptr, __pu_err, type) \ +do { \ + switch (sizeof(*__gu_ptr)) { \ + case 1: \ + __put_mem_asm("sb", (x), __gu_ptr, __pu_err, type); \ + break; \ + case 2: \ + __put_mem_asm("sh", (x), __gu_ptr, __pu_err, type); \ + break; \ + case 4: \ + __put_mem_asm("sw", (x), __gu_ptr, __pu_err, type); \ + break; \ + case 8: \ + __put_mem_8((x), __gu_ptr, __pu_err, type); \ + break; \ + default: \ + BUILD_BUG(); \ + } \ } while (0) =20 /** @@ -253,7 +253,7 @@ do { \ __chk_user_ptr(__gu_ptr); \ \ __enable_user_access(); \ - __put_mem_nocheck(__val, __gu_ptr, __pu_err); \ + __put_mem_nocheck(__val, __gu_ptr, __pu_err, U); \ __disable_user_access(); \ \ __pu_err; \ @@ -279,7 +279,7 @@ do { \ ({ \ __typeof__(*(ptr)) __user *__p =3D (ptr); \ might_fault(); \ - access_ok(__p, sizeof(*__p)) ? \ + access_ok(__p, sizeof(*__p)) ? \ __put_user((x), __p) : \ -EFAULT; \ }) @@ -321,7 +321,7 @@ unsigned long __must_check clear_user(void __user *to, = unsigned long n) do { \ long __kr_err; \ \ - __get_mem_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ + __get_mem_nocheck(*((type *)(dst)), (type *)(src), __kr_err, K);\ if (unlikely(__kr_err)) \ goto err_label; \ } while (0) @@ -330,7 +330,7 @@ do { \ do { \ long __kr_err; \ \ - __put_mem_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \ + __put_mem_nocheck(*((type *)(src)), (type *)(dst), __kr_err, K);\ if (unlikely(__kr_err)) \ goto err_label; \ } while (0) diff --git a/arch/riscv/mm/extable.c b/arch/riscv/mm/extable.c index 35484d830fd6..a21ad8237189 100644 --- a/arch/riscv/mm/extable.c +++ b/arch/riscv/mm/extable.c @@ -64,6 +64,7 @@ bool fixup_exception(struct pt_regs *regs) case EX_TYPE_BPF: return ex_handler_bpf(ex, regs); case EX_TYPE_UACCESS_ERR_ZERO: + case EX_TYPE_KACCESS_ERR_ZERO: return ex_handler_uaccess_err_zero(ex, regs); } =20 --=20 2.25.1