From patchwork Tue Apr 5 07:13:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12801134 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 8262FC433F5 for ; Tue, 5 Apr 2022 07:21:41 +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; bh=iWCvcYE2POq7UbyUguDimNgVSViBAl/o3evR4ip/pHE=; b=wF9Tx6bhZ2dGV6 82+1NslHsUzNApjdozELt1kmETbCkOqvUTRZmyL2ZE26kWine923nbIBmgN2nSLRlIa0hgclIA4ys 8Ko6hGQ1tAyCNXpgGzrgfDm1EUIXKyXKKIa00fJaNfCznw+gu1LBNQLNgVfMaNE+OwIreSt1s410F tOZ2gLF1qbIQIsJ+I/mtw86I6X5vju4L+NnDPpBEt2sURpl+U8g85Ek9K14CTwHiXNg/erQ/Rxp12 uQBYgaRK2ZEImUJuupChlCIADjbz1JgU8DMFcHjUA85xaehbjgdBYyWxCuX8SJkbXkALlhS7E2uQt zf4kIz6AukKB3pGrCAaA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nbdVK-00HTcn-EM; Tue, 05 Apr 2022 07:21:30 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nbdOl-00HPXj-IO; Tue, 05 Apr 2022 07:14:45 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 33203B81B18; Tue, 5 Apr 2022 07:14:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF36BC34113; Tue, 5 Apr 2022 07:14:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649142880; bh=gOXLC6DbRyujFkrzeUs4smkFmQGScsEUJfldX3jEonk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L5wXYg3GrUWMbNCmRoYeCmF/qxoGIJJLXKeE6Mbw0wrW+1WnyDyYv9H19aTHIyLFC TYRgGIy44MY0Ly/e5K0YqWVWRe1UIkcdyxBz4J7RIRoRGnVRdWD1BgCONaEfKaw9xq 7Scm89/NM18hD5vvjRv0crakwm208oNyFhBr6QNMFO179BmhXzoGBHHtlmCS1rrghE 3SCMRU7BjuTmA93/ZG55i4MVEH4fHl9fQCV84fCAWP5c2I51TWbekmZkfwE1vTybiB LYOcB0ZFGBbMcYUHgXBh1+cqzxx2qVHB2fZylhBX2RQswt945mA4TvQACv4y1mbz/m 8q9KOJCELlNPQ== From: guoren@kernel.org To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de, gregkh@linuxfoundation.org, hch@lst.de, nathan@kernel.org, naresh.kamboju@linaro.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-parisc@vger.kernel.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, heiko@sntech.de, Guo Ren , Palmer Dabbelt Subject: [PATCH V12 12/20] riscv: compat: syscall: Add entry.S implementation Date: Tue, 5 Apr 2022 15:13:06 +0800 Message-Id: <20220405071314.3225832-13-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220405071314.3225832-1-guoren@kernel.org> References: <20220405071314.3225832-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220405_001443_856586_D09332A2 X-CRM114-Status: GOOD ( 10.97 ) 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: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Guo Ren Implement the entry of compat_sys_call_table[] in asm. Ref to riscv-privileged spec 4.1.1 Supervisor Status Register (sstatus): BIT[32:33] = UXL[1:0]: - 1:32 - 2:64 - 3:128 Signed-off-by: Guo Ren Signed-off-by: Guo Ren Reviewed-by: Palmer Dabbelt Tested-by: Heiko Stuebner Cc: Arnd Bergmann --- arch/riscv/include/asm/csr.h | 7 +++++++ arch/riscv/kernel/entry.S | 18 ++++++++++++++++-- 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index e935f27b10fd..f5d1251fd6c7 100644 --- a/arch/riscv/include/asm/csr.h +++ b/arch/riscv/include/asm/csr.h @@ -36,6 +36,13 @@ #define SR_SD _AC(0x8000000000000000, UL) /* FS/XS dirty */ #endif +#ifdef CONFIG_64BIT +#define SR_UXL _AC(0x300000000, UL) /* XLEN mask for U-mode */ +#define SR_UXL_32 _AC(0x100000000, UL) /* XLEN = 32 for U-mode */ +#define SR_UXL_64 _AC(0x200000000, UL) /* XLEN = 64 for U-mode */ +#define SR_UXL_SHIFT 32 +#endif + /* SATP flags */ #ifndef CONFIG_64BIT #define SATP_PPN _AC(0x003FFFFF, UL) diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index c8b9ce274b9a..2e5b88ca11ce 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -207,13 +207,27 @@ check_syscall_nr: * Syscall number held in a7. * If syscall number is above allowed value, redirect to ni_syscall. */ - bgeu a7, t0, 1f + bgeu a7, t0, 3f +#ifdef CONFIG_COMPAT + REG_L s0, PT_STATUS(sp) + srli s0, s0, SR_UXL_SHIFT + andi s0, s0, (SR_UXL >> SR_UXL_SHIFT) + li t0, (SR_UXL_32 >> SR_UXL_SHIFT) + sub t0, s0, t0 + bnez t0, 1f + + /* Call compat_syscall */ + la s0, compat_sys_call_table + j 2f +1: +#endif /* Call syscall */ la s0, sys_call_table +2: slli t0, a7, RISCV_LGPTR add s0, s0, t0 REG_L s0, 0(s0) -1: +3: jalr s0 ret_from_syscall: