From patchwork Sat Jun 19 03:43:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 463858 Delivered-To: patch@linaro.org Received: by 2002:a05:6638:102:0:0:0:0 with SMTP id x2csp535805jao; Fri, 18 Jun 2021 20:51:13 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzwyvebDx3X3oYRrippe8girh69KI/pCRGRcCH4vrC8nB4SNbZITkPwK90bFaJu7Wdld4Wq X-Received: by 2002:a05:6e02:12ac:: with SMTP id f12mr9645430ilr.207.1624074673758; Fri, 18 Jun 2021 20:51:13 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1624074673; cv=none; d=google.com; s=arc-20160816; b=oiOy87/H+xtvj3rYLk9t5SwB+Q9v3dUBAG330vmBWP4FiR7SRD5se8V/WlF6SfHs2D I5g5UUVwZ8c31S3SdcLlgnMNVYazdJVsH8zAkIsmrpQoP6IatK4xlDc7Mhanbv2wpg3O c83JYw62ZmMSxU8xsVLcEZAoq2JEOknRFbxDPlgucnrJ8F0NSa4Jwr5eCY0muk0WnOkR 7RMzocZTP76VnBUAu4WcYRL2Xto6/MJ8CjcvY2ChnfHyOXPph+DoFBaxjVWtkn1pIVN4 696ixUdFHpDReIlWvAPSHRC3F/nuB3gNnkwRlb5Xv9JgyTbstgWyf7g/mrI8mWiRE2b2 xC8A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:cc:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:to:from :dkim-signature; bh=jUXae3SraHm4OVG+O8NmkBHPeUZIHDauOpN34upW9DU=; b=QNFEnFeqxPr0BrO7GMRNlClQm6qvOqomGmy0ZU/aTjoEfUN3T0HoS73yApwS5pWAt+ QBP4FLCT6mlRgoHi4PBgbw3OhOFOQ3Cu5v1LphzPXULhzPAKzLP6IkbqZYpG56zjCTFa DplEOf8YdyEENa9q3d+ZbYwWLcETNBhcbt0bcrj5Xrghn+OA0h2nX6RKt77vKrxNtY07 041ooA4ysmnum26dCrfbxbO6H772oYlEQ8TKYnMbrXCJm/FTB1A7UCTXr7fuIj3s7P0h zNjLtJK3qHV73eMN3xHT4HYwUDXjQUeczfbdhojNgnR1MpaRccQQPGzEU6vpfe9uo9LR 1hEA== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=Hxp8zVdK; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id z10si2445171ioq.37.2021.06.18.20.51.13 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 18 Jun 2021 20:51:13 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=Hxp8zVdK; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:46890 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1luS0n-00085w-6c for patch@linaro.org; Fri, 18 Jun 2021 23:51:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33120) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1luRtd-0000E0-1F for qemu-devel@nongnu.org; Fri, 18 Jun 2021 23:43:49 -0400 Received: from mail-pl1-x634.google.com ([2607:f8b0:4864:20::634]:36804) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1luRtS-00083V-BD for qemu-devel@nongnu.org; Fri, 18 Jun 2021 23:43:48 -0400 Received: by mail-pl1-x634.google.com with SMTP id x10so5680348plg.3 for ; Fri, 18 Jun 2021 20:43:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=jUXae3SraHm4OVG+O8NmkBHPeUZIHDauOpN34upW9DU=; b=Hxp8zVdKo0LHgnRJjsiw2rdWR5HgloN8+Hfji0V5HsaPQx92mKxV2mrYvrJbED9MI/ buqXCi6b7VOjaeSIe0ZCtGM/MvsLc6zCpOFtDcxEqzIQ46DsDdO82U8NldodHks1ht2C UD3Xfv/A6r5pWaONEoQRHY4RoXecueAwPRQXdvk4/d018gHAbv5W0yc20XcNi8l2hYGE CAZsF2cRajFQbo9amEPrz+o7rOZVRbYdN1auXErRoPM6jRaBailyAe0Pzv5hgLnXoAqm zyx+jfMmDjh7cf8um/7JKeNEc6GnrK3DuySZ3cCgHgOhK3g5v3wAbsASWRCsmcx10B+V uujg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=jUXae3SraHm4OVG+O8NmkBHPeUZIHDauOpN34upW9DU=; b=Wpk+ZdNFJz5PIVDvCu/Juj5gomjmaidy7NeYv1l5I5SmvAT9zOLOVlkv/ILQEBe/GX gr8pkD8fSCImxFC0hIBSGxgVnQwDXDJJ8ddp4WZtwj33Y6W+fc+hxqtqfZQuGzzjfJjo 8++JWoyloDb2SfePLv55KaQODTWKl/hbrzvbJABILJ1HFAtd9C5PuRq1JM1e40pmLSwL TiBsnVXABhdcnVruM2wJJfqqA4QG9Y1AZPSH3Wq6caBpetvVHxKJaHYaV4UUnm4Dj/Ai JCFxVCC5Xnr9ivWLTV2lOAGoF/tjMe6sV2yGAVHMVdJ+raYOSh8u8I9J7bvEaBPJBXFc +RAA== X-Gm-Message-State: AOAM533wY6QBgdJkREqH8rvMGDsiarIlj14eWW/CswnDrMf5sejzRivl 26WW1ne0eFq/KEd8u3OqPpU3zf1Gt5CMPg== X-Received: by 2002:a17:902:d4d0:b029:113:fb3d:3644 with SMTP id o16-20020a170902d4d0b0290113fb3d3644mr7545662plg.58.1624074216979; Fri, 18 Jun 2021 20:43:36 -0700 (PDT) Received: from localhost.localdomain ([71.212.149.176]) by smtp.gmail.com with ESMTPSA id z6sm10045154pgs.24.2021.06.18.20.43.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jun 2021 20:43:36 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 11/12] linux-user/x86_64: Add vdso Date: Fri, 18 Jun 2021 20:43:28 -0700 Message-Id: <20210619034329.532318-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210619034329.532318-1-richard.henderson@linaro.org> References: <20210619034329.532318-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::634; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x634.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alex.bennee@linaro.org, laurent@vivier.eu Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Building the vdso itself is not actually wired up to anything, since we require a cross-compiler. Just check in that file for now. Signed-off-by: Richard Henderson --- linux-user/elfload.c | 3 + linux-user/x86_64/Makefile.vdso | 3 + linux-user/x86_64/meson.build | 6 ++ linux-user/x86_64/vdso.S | 122 ++++++++++++++++++++++++++++++++ linux-user/x86_64/vdso.ld | 74 +++++++++++++++++++ linux-user/x86_64/vdso.so | Bin 0 -> 5912 bytes 6 files changed, 208 insertions(+) create mode 100644 linux-user/x86_64/Makefile.vdso create mode 100644 linux-user/x86_64/vdso.S create mode 100644 linux-user/x86_64/vdso.ld create mode 100755 linux-user/x86_64/vdso.so diff --git a/linux-user/x86_64/vdso.so b/linux-user/x86_64/vdso.so new file mode 100755 index 0000000000000000000000000000000000000000..0cdb8f1706893abf221e42d3443d9f5d49fef080 GIT binary patch literal 5912 zcmeHL&ud&&6h4#5G>PWNw2COv8bm7;9TF)LD3qy9;>5Ng1_DtiuhYzHCzzShnU^w= zQbCLwDVjwW#YJgxFIg5hDiyK*1ybnF3T~t>3@+61eDlsXyt#d~g5c_%rNM0somwpb*kfKPhUU?gKao$oB`^^tD zV((?&WWo`m*nAMz9Q71#@Igx3FNf2SSj#;e&>c8vfA=^Zj7) ze_G$d<&O2g;6yC${|40ODXhl!o%PzU{2t}U9R3OO&pP}g=I`=bZP;tf zr!VXZV!4fIV+XKH@zz`N{pj}1?5CF(J{d2+e{|!gp^x{zd$D=> z++&{|seZKo+kN}CPx+Ol4_e}RXG@Kmx4c?ge#1NC2f<3kzl*H<4RYpEJ6$TSlZ(da z`0|@;vbs`TYd(+EIsKoIW3zLMOWq5)7j=F;v41+Cma@OAU;Z-mu=XFLNvD6KyFYQGu+a(zHotqOHKHn_uduNbWWN4+aC3O# ztLy6ePnOo-;MCz!zqI~3r+)3`(?T8G&G&Zna5tan=;CgEm&EDWv??X);BNo^j{fiF z2c!U@;8;4M|2PEA0ZrnrSAWK<-JKtLBTnz)H-DUtd{+559Sr?~Jg(k7X#TFgoHgF{ z&sm-^h!-_#nRRU=zpH~^GTzO9Lisp-jPnWbZXWTbUYk37eD;WH#Fyt5z3GBCvvBzM zv{#r~h=@T`pK+qngruuaBT_V0v$nOUdLB`2g0=ah{J6c^*c8TMoN=3M$fy+@IeUM6Q$hT|BDsI7=hX?-k;t z-HA1F=l{BnV@`~}*SVvm>747ZUv}d8Jw-f6M??4is1NSX^ThT+27K)S!FwDvJ~!l| zb0-HpX^weY7|ybW^y2+lSDZib+0|ypuIve$=Q~W;aQAPw(sA*7?Hs##pZLE4>E9DK literal 0 HcmV?d00001 -- 2.25.1 diff --git a/linux-user/elfload.c b/linux-user/elfload.c index a6ad454617..b70a5c48a2 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -154,6 +154,9 @@ static uint32_t get_elf_hwcap(void) #define ELF_CLASS ELFCLASS64 #define ELF_ARCH EM_X86_64 +#define HAVE_VDSO 1 +#include "vdso.c.inc" + static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) { regs->rax = 0; diff --git a/linux-user/x86_64/Makefile.vdso b/linux-user/x86_64/Makefile.vdso new file mode 100644 index 0000000000..6111d6f21c --- /dev/null +++ b/linux-user/x86_64/Makefile.vdso @@ -0,0 +1,3 @@ +vdso.so: vdso.S vdso.ld Makefile.vdso + $(CC) -nostdlib -shared -Wl,-T,vdso.ld -Wl,--build-id=none \ + -Wl,-h,linux-vdso.so.1 -Wl,--hash-style=both vdso.S -o $@ diff --git a/linux-user/x86_64/meson.build b/linux-user/x86_64/meson.build index 203af9a60c..f6a0015953 100644 --- a/linux-user/x86_64/meson.build +++ b/linux-user/x86_64/meson.build @@ -3,3 +3,9 @@ syscall_nr_generators += { arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ], output: '@BASENAME@_nr.h') } + +gen = [ + gen_vdso.process('vdso.so') +] + +linux_user_ss.add(when: 'TARGET_X86_64', if_true: gen) diff --git a/linux-user/x86_64/vdso.S b/linux-user/x86_64/vdso.S new file mode 100644 index 0000000000..7d0d653526 --- /dev/null +++ b/linux-user/x86_64/vdso.S @@ -0,0 +1,122 @@ +/* + * x86-64 linux replacement vdso. + * + * Copyright 2021 Linaro, Ltd. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include + + .globl __vdso_clock_gettime + .type __vdso_clock_gettime, @function + .balign 16 + .cfi_startproc +__vdso_clock_gettime: + mov $__NR_clock_gettime, %eax + syscall + ret + .cfi_endproc + .size __vdso_clock_gettime, . - __vdso_clock_gettime + +clock_gettime = __vdso_clock_gettime + .weak clock_gettime + + .globl __vdso_clock_getres + .type __vdso_clock_getres, @function + .balign 16 + .cfi_startproc +__vdso_clock_getres: + mov $__NR_clock_getres, %eax + syscall + ret + .cfi_endproc + .size __vdso_clock_getres, . - __vdso_clock_getres + +clock_getres = __vdso_clock_getres + .weak clock_getres + + .globl __vdso_gettimeofday + .type __vdso_gettimeofday, @function + .balign 16 + .cfi_startproc +__vdso_gettimeofday: + mov $__NR_gettimeofday, %eax + syscall + ret + .cfi_endproc + .size __vdso_gettimeofday, . - __vdso_gettimeofday + +gettimeofday = __vdso_gettimeofday + .weak gettimeofday + + + .globl __vdso_time + .type __vdso_time, @function + .balign 16 + .cfi_startproc +__vdso_time: + mov $__NR_time, %eax + syscall + ret + .cfi_endproc + .size __vdso_time, . - __vdso_time + +time = __vdso_time + .weak time + + + .globl __vdso_getcpu + .type __vdso_getcpu, @function + .balign 16 + .cfi_startproc +__vdso_getcpu: + /* + * ??? There is no syscall number for this allocated on x64. + * We can handle this several ways: + * + * (1) Invent a syscall number for use within qemu. + * It should be easy enough to pick a number that + * is well out of the way of the kernel numbers. + * + * (2) Force the emulated cpu to support the rdtscp insn, + * and initialize the TSC_AUX value the appropriate value. + * + * (3) Pretend that we're always running on cpu 0. + * + * This last is the one that's implemented here, with the + * tiny bit of extra code to support rdtscp in place. + */ + xor %ecx, %ecx /* rdtscp w/ tsc_aux = 0 */ + + /* if (cpu != NULL) *cpu = (ecx & 0xfff); */ + test %rdi, %rdi + jz 1f + mov %ecx, %eax + and $0xfff, %eax + mov %eax, (%rdi) + + /* if (node != NULL) *node = (ecx >> 12); */ +1: test %rsi, %rsi + jz 2f + shr $12, %ecx + mov %ecx, (%rsi) + +2: xor %eax, %eax + ret + .cfi_endproc + .size __vdso_getcpu, . - __vdso_getcpu + +getcpu = __vdso_getcpu + .weak getcpu + +/* + * ??? Perhaps add elf notes. E.g. + * + * #include + * ELFNOTE_START(Linux, 0, "a") + * .long LINUX_VERSION_CODE + * ELFNOTE_END + * + * but what version number would we set for QEMU? + */ diff --git a/linux-user/x86_64/vdso.ld b/linux-user/x86_64/vdso.ld new file mode 100644 index 0000000000..baf261f045 --- /dev/null +++ b/linux-user/x86_64/vdso.ld @@ -0,0 +1,74 @@ +/* + * Linker script for linux x86-64 replacement vdso. + * + * Copyright 2021 Linaro, Ltd. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +VERSION { + LINUX_2.6 { + global: + clock_gettime; + __vdso_clock_gettime; + gettimeofday; + __vdso_gettimeofday; + getcpu; + __vdso_getcpu; + time; + __vdso_time; + clock_getres; + __vdso_clock_getres; + + local: *; + }; +} + + +PHDRS { + phdr PT_PHDR FLAGS(4) PHDRS; + data PT_LOAD FLAGS(6) FILEHDR PHDRS; + text PT_LOAD FLAGS(5); + dynamic PT_DYNAMIC FLAGS(4); + eh_frame_hdr PT_GNU_EH_FRAME; + note PT_NOTE FLAGS(4); +} + +SECTIONS { + /* ??? We can't really prelink to any address without knowing + something about the virtual memory space of the host, since + that leaks over into the available memory space of the guest. */ + . = SIZEOF_HEADERS; + + /* The following, including the FILEHDRS and PHDRS, are modified + when we relocate the binary. We want them to be initially + writable for the relocation; we'll force them read-only after. */ + .note : { *(.note*) } :data :note + .dynamic : { *(.dynamic) } :data :dynamic + .dynsym : { *(.dynsym) } :data + .data : { + /* There ought not be any real read-write data. + But since we manipulated the segment layout, + we have to put these sections somewhere. */ + *(.data*) + *(.sdata*) + *(.got.plt) *(.got) + *(.gnu.linkonce.d.*) + *(.bss*) + *(.dynbss*) + *(.gnu.linkonce.b.*) + } + + .rodata : { *(.rodata*) } + .hash : { *(.hash) } + .gnu.hash : { *(.gnu.hash) } + .dynstr : { *(.dynstr) } + .gnu.version : { *(.gnu.version) } + .gnu.version_d : { *(.gnu.version_d) } + .gnu.version_r : { *(.gnu.version_r) } + .eh_frame_hdr : { *(.eh_frame_hdr) } :data :eh_frame_hdr + .eh_frame : { *(.eh_frame) } :data + + . = ALIGN(4096); + .text : { *(.text*) } :text =0x90909090 +}