From patchwork Sat Apr 2 13:52:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12799235 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 3853FC433F5 for ; Sat, 2 Apr 2022 13:55:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239790AbiDBN5M (ORCPT ); Sat, 2 Apr 2022 09:57:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351902AbiDBN4s (ORCPT ); Sat, 2 Apr 2022 09:56:48 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1407612AA0; Sat, 2 Apr 2022 06:54:38 -0700 (PDT) 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 C7F56B80688; Sat, 2 Apr 2022 13:54:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F2AA0C34111; Sat, 2 Apr 2022 13:54:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648907675; bh=6vp86t6L9YNVq1oOxZY4ODPiNHsPcvWwCzpmlPVsE6k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jy32WrtepkhWqhiy/BEFtKftbrh77z661KufGiA4W9WgGuA6AnEkdAYXA+ELxAX5o E5tlQ27sw0xOneBVSkzNGeNAUyHBnSeqqH8SJsjg2kADUjhqEQZDQePv0w84gbeWYO xbg0GLjBqpoj/MnfAdaQ5dsn7O1MPFipOYB9ZQvEMuqpDaAKTI+IxGybRhjVI8GBou C7nNuXjYIeFS1i5N2kafH7ksm/TMiUUS8yfNjQaIIfnG0GKZkVG9Rk+X1pmr4SM80u 0ZcaVOBMJnsRHPPVr4G2fFXJhQHI7MUl67OhINigRjdaxqnF+vz7nkC2h8G+dX8Re1 W2g5iZCBHZr4Q== From: guoren@kernel.org To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de, gregkh@linuxfoundation.org, hch@lst.de Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-csky@vger.kernel.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 Subject: [PATCH V11 16/20] riscv: compat: vdso: Add COMPAT_VDSO base code implementation Date: Sat, 2 Apr 2022 21:52:52 +0800 Message-Id: <20220402135256.2691868-17-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220402135256.2691868-1-guoren@kernel.org> References: <20220402135256.2691868-1-guoren@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Guo Ren There is no vgettimeofday supported in rv32 that makes simple to generate rv32 vdso code which only needs riscv64 compiler. Other architectures need change compiler or -m (machine parameter) to support vdso32 compiling. If rv32 support vgettimeofday (which cause C compile) in future, we would add CROSS_COMPILE to support that makes more requirement on compiler enviornment. linux-rv64/arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg: file format elf64-littleriscv Disassembly of section .text: 0000000000000800 <__vdso_rt_sigreturn>: 800: 08b00893 li a7,139 804: 00000073 ecall 808: 0000 unimp ... 000000000000080c <__vdso_getcpu>: 80c: 0a800893 li a7,168 810: 00000073 ecall 814: 8082 ret ... 0000000000000818 <__vdso_flush_icache>: 818: 10300893 li a7,259 81c: 00000073 ecall 820: 8082 ret linux-rv32/arch/riscv/kernel/vdso/vdso.so.dbg: file format elf32-littleriscv Disassembly of section .text: 00000800 <__vdso_rt_sigreturn>: 800: 08b00893 li a7,139 804: 00000073 ecall 808: 0000 unimp ... 0000080c <__vdso_getcpu>: 80c: 0a800893 li a7,168 810: 00000073 ecall 814: 8082 ret ... 00000818 <__vdso_flush_icache>: 818: 10300893 li a7,259 81c: 00000073 ecall 820: 8082 ret Finally, reuse all *.S from vdso in compat_vdso that makes implementation clear and readable. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Tested-by: Heiko Stuebner Cc: Arnd Bergmann Cc: Palmer Dabbelt --- arch/riscv/Makefile | 5 ++ arch/riscv/include/asm/vdso.h | 9 +++ arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/compat_vdso/.gitignore | 2 + arch/riscv/kernel/compat_vdso/Makefile | 78 +++++++++++++++++++ arch/riscv/kernel/compat_vdso/compat_vdso.S | 8 ++ .../kernel/compat_vdso/compat_vdso.lds.S | 3 + arch/riscv/kernel/compat_vdso/flush_icache.S | 3 + .../compat_vdso/gen_compat_vdso_offsets.sh | 5 ++ arch/riscv/kernel/compat_vdso/getcpu.S | 3 + arch/riscv/kernel/compat_vdso/note.S | 3 + arch/riscv/kernel/compat_vdso/rt_sigreturn.S | 3 + arch/riscv/kernel/vdso/vdso.S | 6 +- 13 files changed, 128 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/kernel/compat_vdso/.gitignore create mode 100644 arch/riscv/kernel/compat_vdso/Makefile create mode 100644 arch/riscv/kernel/compat_vdso/compat_vdso.S create mode 100644 arch/riscv/kernel/compat_vdso/compat_vdso.lds.S create mode 100644 arch/riscv/kernel/compat_vdso/flush_icache.S create mode 100755 arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh create mode 100644 arch/riscv/kernel/compat_vdso/getcpu.S create mode 100644 arch/riscv/kernel/compat_vdso/note.S create mode 100644 arch/riscv/kernel/compat_vdso/rt_sigreturn.S diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index c6ca1b9cbf71..6a494029b8bd 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -112,12 +112,17 @@ libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ + $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ + $(build)=arch/riscv/kernel/compat_vdso $@) ifeq ($(KBUILD_EXTMOD),) ifeq ($(CONFIG_MMU),y) prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h + $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \ + $(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h) + endif endif diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h index bc6f75f3a199..af981426fe0f 100644 --- a/arch/riscv/include/asm/vdso.h +++ b/arch/riscv/include/asm/vdso.h @@ -21,6 +21,15 @@ #define VDSO_SYMBOL(base, name) \ (void __user *)((unsigned long)(base) + __vdso_##name##_offset) + +#ifdef CONFIG_COMPAT +#include + +#define COMPAT_VDSO_SYMBOL(base, name) \ + (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset) + +#endif /* CONFIG_COMPAT */ + #endif /* !__ASSEMBLY__ */ #endif /* CONFIG_MMU */ diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile index 3b3e425aadd2..6365f382d2fd 100644 --- a/arch/riscv/kernel/Makefile +++ b/arch/riscv/kernel/Makefile @@ -69,3 +69,4 @@ obj-$(CONFIG_JUMP_LABEL) += jump_label.o obj-$(CONFIG_EFI) += efi.o obj-$(CONFIG_COMPAT) += compat_syscall_table.o +obj-$(CONFIG_COMPAT) += compat_vdso/ diff --git a/arch/riscv/kernel/compat_vdso/.gitignore b/arch/riscv/kernel/compat_vdso/.gitignore new file mode 100644 index 000000000000..19d83d846c1e --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +compat_vdso.lds diff --git a/arch/riscv/kernel/compat_vdso/Makefile b/arch/riscv/kernel/compat_vdso/Makefile new file mode 100644 index 000000000000..260daf3236d3 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/Makefile @@ -0,0 +1,78 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for compat_vdso +# + +# Symbols present in the compat_vdso +compat_vdso-syms = rt_sigreturn +compat_vdso-syms += getcpu +compat_vdso-syms += flush_icache + +COMPAT_CC := $(CC) +COMPAT_LD := $(LD) + +COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32 +COMPAT_LD_FLAGS := -melf32lriscv + +# Files to link into the compat_vdso +obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o + +# Build rules +targets := $(obj-compat_vdso) compat_vdso.so compat_vdso.so.dbg compat_vdso.lds +obj-compat_vdso := $(addprefix $(obj)/, $(obj-compat_vdso)) + +obj-y += compat_vdso.o +CPPFLAGS_compat_vdso.lds += -P -C -U$(ARCH) + +# Disable profiling and instrumentation for VDSO code +GCOV_PROFILE := n +KCOV_INSTRUMENT := n +KASAN_SANITIZE := n +UBSAN_SANITIZE := n + +# Force dependency +$(obj)/compat_vdso.o: $(obj)/compat_vdso.so + +# link rule for the .so file, .lds has to be first +$(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.lds $(obj-compat_vdso) FORCE + $(call if_changed,compat_vdsold) +LDFLAGS_compat_vdso.so.dbg = -shared -S -soname=linux-compat_vdso.so.1 \ + --build-id=sha1 --hash-style=both --eh-frame-hdr + +$(obj-compat_vdso): %.o: %.S FORCE + $(call if_changed_dep,compat_vdsoas) + +# strip rule for the .so file +$(obj)/%.so: OBJCOPYFLAGS := -S +$(obj)/%.so: $(obj)/%.so.dbg FORCE + $(call if_changed,objcopy) + +# Generate VDSO offsets using helper script +gen-compat_vdsosym := $(srctree)/$(src)/gen_compat_vdso_offsets.sh +quiet_cmd_compat_vdsosym = VDSOSYM $@ + cmd_compat_vdsosym = $(NM) $< | $(gen-compat_vdsosym) | LC_ALL=C sort > $@ + +include/generated/compat_vdso-offsets.h: $(obj)/compat_vdso.so.dbg FORCE + $(call if_changed,compat_vdsosym) + +# actual build commands +# The DSO images are built using a special linker script +# Make sure only to export the intended __compat_vdso_xxx symbol offsets. +quiet_cmd_compat_vdsold = VDSOLD $@ + cmd_compat_vdsold = $(COMPAT_LD) $(ld_flags) $(COMPAT_LD_FLAGS) -T $(filter-out FORCE,$^) -o $@.tmp && \ + $(OBJCOPY) $(patsubst %, -G __compat_vdso_%, $(compat_vdso-syms)) $@.tmp $@ && \ + rm $@.tmp + +# actual build commands +quiet_cmd_compat_vdsoas = VDSOAS $@ + cmd_compat_vdsoas = $(COMPAT_CC) $(a_flags) $(COMPAT_CC_FLAGS) -c -o $@ $< + +# install commands for the unstripped file +quiet_cmd_compat_vdso_install = INSTALL $@ + cmd_compat_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/compat_vdso/$@ + +compat_vdso.so: $(obj)/compat_vdso.so.dbg + @mkdir -p $(MODLIB)/compat_vdso + $(call cmd,compat_vdso_install) + +compat_vdso_install: compat_vdso.so diff --git a/arch/riscv/kernel/compat_vdso/compat_vdso.S b/arch/riscv/kernel/compat_vdso/compat_vdso.S new file mode 100644 index 000000000000..fea4a8b0c45d --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/compat_vdso.S @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#define vdso_start compat_vdso_start +#define vdso_end compat_vdso_end + +#define __VDSO_PATH "arch/riscv/kernel/compat_vdso/compat_vdso.so" + +#include <../vdso/vdso.S> diff --git a/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S b/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S new file mode 100644 index 000000000000..02a9ec5dc7f6 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <../vdso/vdso.lds.S> diff --git a/arch/riscv/kernel/compat_vdso/flush_icache.S b/arch/riscv/kernel/compat_vdso/flush_icache.S new file mode 100644 index 000000000000..88e21a84a974 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/flush_icache.S @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <../vdso/flush_icache.S> diff --git a/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh b/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh new file mode 100755 index 000000000000..8ac070c783b3 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh @@ -0,0 +1,5 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +LC_ALL=C +sed -n -e 's/^[0]\+\(0[0-9a-fA-F]*\) . \(__vdso_[a-zA-Z0-9_]*\)$/\#define compat\2_offset\t0x\1/p' diff --git a/arch/riscv/kernel/compat_vdso/getcpu.S b/arch/riscv/kernel/compat_vdso/getcpu.S new file mode 100644 index 000000000000..946449a15a94 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/getcpu.S @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <../vdso/getcpu.S> diff --git a/arch/riscv/kernel/compat_vdso/note.S b/arch/riscv/kernel/compat_vdso/note.S new file mode 100644 index 000000000000..67c50898b8e5 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/note.S @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <../vdso/note.S> diff --git a/arch/riscv/kernel/compat_vdso/rt_sigreturn.S b/arch/riscv/kernel/compat_vdso/rt_sigreturn.S new file mode 100644 index 000000000000..f4c98f18c053 --- /dev/null +++ b/arch/riscv/kernel/compat_vdso/rt_sigreturn.S @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <../vdso/rt_sigreturn.S> diff --git a/arch/riscv/kernel/vdso/vdso.S b/arch/riscv/kernel/vdso/vdso.S index df222245be05..83f1c899e8d8 100644 --- a/arch/riscv/kernel/vdso/vdso.S +++ b/arch/riscv/kernel/vdso/vdso.S @@ -7,12 +7,16 @@ #include #include +#ifndef __VDSO_PATH +#define __VDSO_PATH "arch/riscv/kernel/vdso/vdso.so" +#endif + __PAGE_ALIGNED_DATA .globl vdso_start, vdso_end .balign PAGE_SIZE vdso_start: - .incbin "arch/riscv/kernel/vdso/vdso.so" + .incbin __VDSO_PATH .balign PAGE_SIZE vdso_end: