From patchwork Mon Oct 30 21:17:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 739274 Delivered-To: patch@linaro.org Received: by 2002:a5d:4c47:0:b0:32d:baff:b0ca with SMTP id n7csp1336520wrt; Mon, 30 Oct 2023 14:18:31 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHd+YKdICM6hQILpY8wOMl9Kw4yJgybNssMf/8G+zkvCkVJWVTzdQdskk8CrEg0HhszzVDO X-Received: by 2002:a05:620a:3192:b0:775:98ab:e11a with SMTP id bi18-20020a05620a319200b0077598abe11amr1503521qkb.11.1698700711129; Mon, 30 Oct 2023 14:18:31 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1698700711; cv=none; d=google.com; s=arc-20160816; b=K4gBx99BErCWjBlEISXvX04fTOWGwmYZLHDoAiPxnJSllGrFPI8k0Hvfd3m8GJRV7n G1cLCtzllhm2UEIM7QXfr6vtsr/0QZNiFkZmPb2CeRExH1bL791GcEJu3zfMR+vsh73o EWk0KqOHDjQJvZDk3oKo76z/ogHkFStNPgGT0U35PreOEaVjFsY1L97lWSB9LZoMIT+r FpsABDFzDQ/xCQDNSEWs9h8RaDL2lihBBn6gf6XbCrMU/TfUYYY65X8VatD+Ze5Tr/Lz Lc9jAqF63kxfWMxa+MGKEko+yyunLyHDtFK3eKkl6gFPP68Ssx6qtMgYWkqlQykxyit7 3tFw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to: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=o8UKlKVkoj09wOTSfnwVa8vuy3oPCOLj92gGCvrYZjE=; fh=PnYt+qEB9tAfMKoqBm2xjKOFpYyFFGPudh5cVIoieJM=; b=pRJTCnCwwRB+rDEmyuSTCgeZHcYP2p0T6oczcOBaQwhgzoCIXbkbg6I6f+lccd4I84 rO/WSGyU1C6MtOGeMkQnP+nRoBQtB8RENHWmtpEEB6+oooEdm7VfMY6WCZAy2FEVyJGJ yjveyxo75ngpVm1Ft8VhFatPGmqZYDOZI5TKgPmgN7z7e/ctXCbLJtFmAYA8guU9g9mG Ffsutme1WBcYiFf6WpXbQ1g6oYQsjdVPBLX769P4auGI8t1UQL/I7GpbvQadGoWPf5b8 gw3LZZwEI9j8WROj1sNOkGsbJUrLaAHvvPHOnvYWXILT1LNERxdilV3b9HdFIPqg7YlL Xqiw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=h7BBz2mj; 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=pass (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 s11-20020a05620a254b00b0077a0282bfa1si6792812qko.261.2023.10.30.14.18.30 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Mon, 30 Oct 2023 14:18:31 -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=pass header.i=@linaro.org header.s=google header.b=h7BBz2mj; 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=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qxZe9-00017A-Nb; Mon, 30 Oct 2023 17:18:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qxZdx-000115-GU for qemu-devel@nongnu.org; Mon, 30 Oct 2023 17:17:53 -0400 Received: from mail-pl1-x630.google.com ([2607:f8b0:4864:20::630]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qxZdp-0006VM-H5 for qemu-devel@nongnu.org; Mon, 30 Oct 2023 17:17:52 -0400 Received: by mail-pl1-x630.google.com with SMTP id d9443c01a7336-1cc53d0030fso9722505ad.0 for ; Mon, 30 Oct 2023 14:17:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1698700660; x=1699305460; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=o8UKlKVkoj09wOTSfnwVa8vuy3oPCOLj92gGCvrYZjE=; b=h7BBz2mj/SQgaMpiYWwsC+CIWR7lWViiFM/jJjlo7sjUCieu4rfJGr/kSMbVTpnMKo Y6NVdrguCejjXbpu96kYCrBKCDUuMa09/1oLbw7o8G1QjBwm/6c1vL5z+xAx1qSE0Pgl EljRmAJWaZNj2E/idibLQUlcCDtP3pRJVgqHS3XTLl7Pj9DRH9H09d9rVWFo5DMVTB4R Xlwt9RiHi216KsmIPVj+7Y+Y3y4A4T1lM7/aDCMeGNpCth7cGYhyDQSzi9cxs1Daiqd6 YkCo7KhLK+sWCOPJRI+m5l/Ef7p+YRZaxAa9tqS7bP2a3NXgtjZ9XErUDMcadxssuLzm MmWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698700660; x=1699305460; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=o8UKlKVkoj09wOTSfnwVa8vuy3oPCOLj92gGCvrYZjE=; b=t1ndPjq4VPS8UqaaFoKrbFopMh/rbx6qWrDoiWr5Fqt4FDi8jHeb5kZGi78Eoxw5V7 EZn+kW+8WgZgsXSNrjmHJIS7ItfXYX1uYdeURGpRKfsiSsxj1Am606eLwBb1Hgp7hv6P 9e5RMLSQBOw3H6wxhhpb9isAsENounyD7Bb9ehiOOIb6fOs6BAaTX6PBXT8Mz9s+Pdp+ bXzo8aTp3jXYJsB+20eyO52j2toMcR1qrdcDmIg3V5qBLAw+DW39ERCzE6qip9sV9aEE +hZmZVLn9QuEm2kc/7a+NGKrhzDJog4i05KfO86V/miw2J1XHxweGSndJHbp0rneBAyl WAew== X-Gm-Message-State: AOJu0YznUW1fj84q0dSUaBUSbB9dorz2YTMFxmh2Q/3e0cn69wSlZJ8l znojynxgD9flY4WDs5W6VKosNoyr5GjdgfgKgMk= X-Received: by 2002:a17:903:2805:b0:1cc:30bf:d07c with SMTP id kp5-20020a170903280500b001cc30bfd07cmr744293plb.10.1698700660512; Mon, 30 Oct 2023 14:17:40 -0700 (PDT) Received: from stoup.. ([71.212.149.95]) by smtp.gmail.com with ESMTPSA id jf2-20020a170903268200b001cc32261bdfsm4670350plb.38.2023.10.30.14.17.39 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Oct 2023 14:17:40 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PULL 13/21] linux-user/arm: Add vdso Date: Mon, 30 Oct 2023 14:17:19 -0700 Message-Id: <20231030211727.165090-14-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231030211727.165090-1-richard.henderson@linaro.org> References: <20231030211727.165090-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::630; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x630.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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Signed-off-by: Richard Henderson --- linux-user/arm/vdso-asmoffset.h | 3 + linux-user/arm/signal.c | 55 ++++++---- linux-user/elfload.c | 3 +- linux-user/arm/Makefile.vdso | 17 ++++ linux-user/arm/meson.build | 12 +++ linux-user/arm/vdso-be.so | Bin 0 -> 2648 bytes linux-user/arm/vdso-le.so | Bin 0 -> 2648 bytes linux-user/arm/vdso.S | 174 ++++++++++++++++++++++++++++++++ linux-user/arm/vdso.ld | 67 ++++++++++++ 9 files changed, 310 insertions(+), 21 deletions(-) create mode 100644 linux-user/arm/vdso-asmoffset.h create mode 100644 linux-user/arm/Makefile.vdso create mode 100755 linux-user/arm/vdso-be.so create mode 100755 linux-user/arm/vdso-le.so create mode 100644 linux-user/arm/vdso.S create mode 100644 linux-user/arm/vdso.ld diff --git a/linux-user/arm/vdso-asmoffset.h b/linux-user/arm/vdso-asmoffset.h new file mode 100644 index 0000000000..252a95c46e --- /dev/null +++ b/linux-user/arm/vdso-asmoffset.h @@ -0,0 +1,3 @@ +/* offsetof(struct sigframe, retcode[3]) */ +#define SIGFRAME_RC3_OFFSET 756 +#define RT_SIGFRAME_RC3_OFFSET 884 diff --git a/linux-user/arm/signal.c b/linux-user/arm/signal.c index cf99fd7b8a..e19b514f17 100644 --- a/linux-user/arm/signal.c +++ b/linux-user/arm/signal.c @@ -21,6 +21,7 @@ #include "user-internals.h" #include "signal-common.h" #include "linux-user/trace.h" +#include "vdso-asmoffset.h" struct target_sigcontext { abi_ulong trap_no; @@ -102,6 +103,11 @@ struct rt_sigframe struct sigframe sig; }; +QEMU_BUILD_BUG_ON(offsetof(struct sigframe, retcode[3]) + != SIGFRAME_RC3_OFFSET); +QEMU_BUILD_BUG_ON(offsetof(struct rt_sigframe, sig.retcode[3]) + != RT_SIGFRAME_RC3_OFFSET); + static abi_ptr sigreturn_fdpic_tramp; /* @@ -160,6 +166,9 @@ get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize) return (sp - framesize) & ~7; } +static void write_arm_sigreturn(uint32_t *rc, int syscall); +static void write_arm_fdpic_sigreturn(uint32_t *rc, int ofs); + static int setup_return(CPUARMState *env, struct target_sigaction *ka, int usig, struct sigframe *frame, abi_ulong sp_addr) @@ -167,9 +176,9 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig, abi_ulong handler = 0; abi_ulong handler_fdpic_GOT = 0; abi_ulong retcode; - int thumb, retcode_idx; - int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info); - bool copy_retcode; + bool is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info); + bool is_rt = ka->sa_flags & TARGET_SA_SIGINFO; + bool thumb; if (is_fdpic) { /* In FDPIC mode, ka->_sa_handler points to a function @@ -184,9 +193,7 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig, } else { handler = ka->_sa_handler; } - thumb = handler & 1; - retcode_idx = thumb + (ka->sa_flags & TARGET_SA_SIGINFO ? 2 : 0); uint32_t cpsr = cpsr_read(env); @@ -202,24 +209,32 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig, cpsr &= ~CPSR_E; } - if (ka->sa_flags & TARGET_SA_RESTORER) { - if (is_fdpic) { - __put_user((abi_ulong)ka->sa_restorer, &frame->retcode[3]); - retcode = (sigreturn_fdpic_tramp + - retcode_idx * RETCODE_BYTES + thumb); - copy_retcode = true; - } else { - retcode = ka->sa_restorer; - copy_retcode = false; - } + /* Our vdso default_sigreturn label is a table of entry points. */ + retcode = default_sigreturn + (is_fdpic * 2 + is_rt) * 8; + + /* + * Put the sigreturn code on the stack no matter which return + * mechanism we use in order to remain ABI compliant. + * Because this is about ABI, always use the A32 instructions, + * despite the fact that our actual vdso trampoline is T16. + */ + if (is_fdpic) { + write_arm_fdpic_sigreturn(frame->retcode, + is_rt ? RT_SIGFRAME_RC3_OFFSET + : SIGFRAME_RC3_OFFSET); } else { - retcode = default_sigreturn + retcode_idx * RETCODE_BYTES + thumb; - copy_retcode = true; + write_arm_sigreturn(frame->retcode, + is_rt ? TARGET_NR_rt_sigreturn + : TARGET_NR_sigreturn); } - /* Copy the code to the stack slot for ABI compatibility. */ - if (copy_retcode) { - memcpy(frame->retcode, g2h_untagged(retcode & ~1), RETCODE_BYTES); + if (ka->sa_flags & TARGET_SA_RESTORER) { + if (is_fdpic) { + /* Place the function descriptor in slot 3. */ + __put_user((abi_ulong)ka->sa_restorer, &frame->retcode[3]); + } else { + retcode = ka->sa_restorer; + } } env->regs[0] = usig; diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 0a3a57018b..7400ed0ca1 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -944,13 +944,14 @@ const char *elf_hwcap2_str(uint32_t bit) #undef GET_FEATURE_ID +#endif /* not TARGET_AARCH64 */ + #if TARGET_BIG_ENDIAN # define VDSO_HEADER "vdso-be.c.inc" #else # define VDSO_HEADER "vdso-le.c.inc" #endif -#endif /* not TARGET_AARCH64 */ #endif /* TARGET_ARM */ #ifdef TARGET_SPARC diff --git a/linux-user/arm/Makefile.vdso b/linux-user/arm/Makefile.vdso new file mode 100644 index 0000000000..2d098a5748 --- /dev/null +++ b/linux-user/arm/Makefile.vdso @@ -0,0 +1,17 @@ +include $(BUILD_DIR)/tests/tcg/arm-linux-user/config-target.mak + +SUBDIR = $(SRC_PATH)/linux-user/arm +VPATH += $(SUBDIR) + +all: $(SUBDIR)/vdso-be.so $(SUBDIR)/vdso-le.so + +# Adding -use-blx disables unneeded interworking without actually using blx. +LDFLAGS = -nostdlib -shared -Wl,-use-blx \ + -Wl,-h,linux-vdso.so.1 -Wl,--build-id=sha1 \ + -Wl,--hash-style=both -Wl,-T,$(SUBDIR)/vdso.ld + +$(SUBDIR)/vdso-be.so: vdso.S vdso.ld vdso-asmoffset.h + $(CC) -o $@ $(LDFLAGS) -mbig-endian $< + +$(SUBDIR)/vdso-le.so: vdso.S vdso.ld vdso-asmoffset.h + $(CC) -o $@ $(LDFLAGS) -mlittle-endian $< diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build index 5a93c925cf..c4bb9af5b8 100644 --- a/linux-user/arm/meson.build +++ b/linux-user/arm/meson.build @@ -5,3 +5,15 @@ syscall_nr_generators += { arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ], output: '@BASENAME@_nr.h') } + +# TARGET_BIG_ENDIAN is defined to 'n' for little-endian; which means it +# is always true as far as source_set.apply() is concerned. Always build +# both header files and include the right one via #if. + +vdso_be_inc = gen_vdso.process('vdso-be.so', + extra_args: ['-s', 'sigreturn_codes']) + +vdso_le_inc = gen_vdso.process('vdso-le.so', + extra_args: ['-s', 'sigreturn_codes']) + +linux_user_ss.add(when: 'TARGET_ARM', if_true: [vdso_be_inc, vdso_le_inc]) diff --git a/linux-user/arm/vdso-be.so b/linux-user/arm/vdso-be.so new file mode 100755 index 0000000000000000000000000000000000000000..69cafbb956e283e2975bac59a10491c0cbafca57 GIT binary patch literal 2648 zcmbtVO>A355T57%q>ketR9ezQ5D`VCwMu1`A`rrf?W8D4OPYuR5-*PZ5?ds8WWR(2 z@#8{h3oY#>2P%XJf@`Y?wNft?xqwg)z@Y~Y{2jstAq3+00GRLFx0^a47sMproBd{H zci-Ec8NZkr$XY&2*2OP(V{8mbk?=~e?h{E$mjvPKkU0Dy0KRoBV@w1z%zRKvVA+F& z^~zXK{%ArSV?xa@xZfTX@xgB(Y4`}`*ZKyuK{v)kv;S6bf8WrkT>1HI=J#C}-v0DM z`Ko86^ZqyN_qyPV0iyusSZkHW-@jr%ep?Va4UKQK=Am1G3a|}`R~n5!;a`RR3)~0& zBh+P#|F5L*D%>Y>i%1lDAGibEs`+;CC!09VIPho_XRMMAY5ar%&)0|_1Kt@mh37=U zx2hZAeHdX3?~e!ucLq!h=LA6obHD6}=FU|f2Mju6;lhx^e0ON;&FanQ51J*e74D=NAY3MoVW#|{6 zanIHg5CLf03mfxAtY?SC_gu{CjJA<-pB(_tzg1GP$SL1Bo+a)3f$z4k_rvzZ7WOgN zJ^><4>mP{+D1V6mJPr-x*-qNEh%uz;lUsF(DljGBI$8)UPyl zNA8oa>(@A1S|7FO(a>)CR!Yzxm1(PEZ z^0nw!=Z+iX1{o6A_<0B9K5Cff`2=TGT(rgQ}v7(FCIR|w_~Q7kFj14 zBZ!Vi+wgjT<<0Me=LBqBI1J9e$GjiLe7}dxdFc2N*p%pg@)YJb_opg2YsvH{IP`qcBbFX4yOh) zc7J+U?7o2`J*ffvNH%*cGh&aVdImCfQ%ledXhQ?p+?1Lc&4xy`MNd-wOA@t(X*V|x z?N&WqG^29GbtF+(DCee2c{M;Rbk5C5VzNA&DCTNK&+b+|%bZiKl`7>8#4bp}DcTd& z+_YmC3y3sK60S4vN+LBpn8>+qwKP8K;%NSp;J#I!GWS^*L^ohW=e*nj1M?ecr}Bk4 zTL*NGBb~hb-UH1%!+NYERZC;wjAO1cj{Wd}=2(yQrE07>zZplc7FcIoZ_R`31?PKE zOxz*-#gf@z*MNm_mp!O@FzdlipFC!M<3U$F z$RXJIz4Y__C=&qJ=6X0gRrAv?=0AXBj6aWAK literal 0 HcmV?d00001 diff --git a/linux-user/arm/vdso-le.so b/linux-user/arm/vdso-le.so new file mode 100755 index 0000000000000000000000000000000000000000..ad05a1251875ac0c76685e1f9190a7307a8444d1 GIT binary patch literal 2648 zcmbtWU1%It6h5<)-6ZYqW>ciL#)n9wmD&!qgeWwKo1aZ8NgB5ajR>7=b|=}zWT)&- zVj@~ojcv8s`j8h9Aw_&tf++N*n7)V<5g#h}py-1lh)4@s`cPfJ@6OyfN%J6hHs74{ zoqO(`JNMpmZeH#k$QXtpT1i52o2xxn z_w4-TgA;d}AB-ETNwkdyeSX4(|NOh=rtr=vd_Bc$r=V{@FGDxb z2kZxU9w^2OS&6)uG+N>b;d^!gTz~GJq>~M2BNq(%4+6geoBjRpeYb^w9KNpro(Vlp zJ8cNwc?>UY;!DRDQ>U9=Nxqs`iodq~%(kbOjXUR6Z#Cm zvm|}VAL(xez5tehI3THH^rb(du~@3Ho_bGROvU_$rfERUMa9H|n3#%TSIXk2wY?3G z$q$QHXf3Z>je#|^mu+hq{d*pq_J@JK@^1XvJDF79_km8|i$QZvZlWYc0%o**L}HOf zPW>*q9(YW(^Zp*tWds@U ze4~nI{qp10j!S2dfTpS@BEvx)kLlnIvCH7X0G0> z?Euj=zyNOnKaKabLPya55w-{O +#include "vdso-asmoffset.h" + +/* + * All supported cpus have T16 instructions: at least arm4t. + * + * We support user-user with m-profile cpus as an extension, because it + * is useful for testing gcc, which requires we avoid A32 instructions. + */ + .thumb + .arch armv4t + .eabi_attribute Tag_FP_arch, 0 + .eabi_attribute Tag_ARM_ISA_use, 0 + + .text + +.macro raw_syscall n + .ifne \n < 0x100 + mov r7, #\n + .elseif \n < 0x1ff + mov r7, #0xff + add r7, #(\n - 0xff) + .else + .err + .endif + swi #0 +.endm + +.macro fdpic_thunk ofs + ldr r3, [sp, #\ofs] + ldmia r2, {r2, r3} + mov r9, r3 + bx r2 +.endm + +.macro endf name + .globl \name + .type \name, %function + .size \name, . - \name +.endm + +/* + * We must save/restore r7 for the EABI syscall number. + * While we're doing that, we might as well save LR to get a free return, + * and a branch that is interworking back to ARMv5. + */ + +.macro SYSCALL name, nr +\name: + .cfi_startproc + push {r7, lr} + .cfi_adjust_cfa_offset 8 + .cfi_offset r7, -8 + .cfi_offset lr, -4 + raw_syscall \nr + pop {r7, pc} + .cfi_endproc +endf \name +.endm + +SYSCALL __vdso_clock_gettime, __NR_clock_gettime +SYSCALL __vdso_clock_gettime64, __NR_clock_gettime64 +SYSCALL __vdso_clock_getres, __NR_clock_getres +SYSCALL __vdso_gettimeofday, __NR_gettimeofday + + +/* + * We, like the real kernel, use a table of sigreturn trampolines. + * Unlike the real kernel, we do not attempt to pack this into as + * few bytes as possible -- simply use 8 bytes per slot. + * + * Within each slot, use the exact same code sequence as the kernel, + * lest we trip up someone doing code inspection. + */ + +.macro slot n + .balign 8 + .org sigreturn_codes + 8 * \n +.endm + +.macro cfi_fdpic_r9 ofs + /* + * fd = *(r13 + ofs) + * r9 = *(fd + 4) + * + * DW_CFA_expression r9, length (7), + * DW_OP_breg13, ofs, DW_OP_deref, + * DW_OP_plus_uconst, 4, DW_OP_deref + */ + .cfi_escape 0x10, 9, 7, 0x7d, (\ofs & 0x7f) + 0x80, (\ofs >> 7), 0x06, 0x23, 4, 0x06 +.endm + +.macro cfi_fdpic_pc ofs + /* + * fd = *(r13 + ofs) + * pc = *fd + * + * DW_CFA_expression lr (14), length (5), + * DW_OP_breg13, ofs, DW_OP_deref, DW_OP_deref + */ + .cfi_escape 0x10, 14, 5, 0x7d, (\ofs & 0x7f) + 0x80, (\ofs >> 7), 0x06, 0x06 +.endm + +/* + * Start the unwind info at least one instruction before the signal + * trampoline, because the unwinder will assume we are returning + * after a call site. + */ + .cfi_startproc simple + .cfi_signal_frame + .cfi_return_column 15 + + .cfi_def_cfa sp, 32 + 64 + .cfi_offset r0, -16 * 4 + .cfi_offset r1, -15 * 4 + .cfi_offset r2, -14 * 4 + .cfi_offset r3, -13 * 4 + .cfi_offset r4, -12 * 4 + .cfi_offset r5, -11 * 4 + .cfi_offset r6, -10 * 4 + .cfi_offset r7, -9 * 4 + .cfi_offset r8, -8 * 4 + .cfi_offset r9, -7 * 4 + .cfi_offset r10, -6 * 4 + .cfi_offset r11, -5 * 4 + .cfi_offset r12, -4 * 4 + .cfi_offset r13, -3 * 4 + .cfi_offset r14, -2 * 4 + .cfi_offset r15, -1 * 4 + + nop + + .balign 16 +sigreturn_codes: + /* [EO]ABI sigreturn */ + slot 0 + raw_syscall __NR_sigreturn + + .cfi_def_cfa_offset 160 + 64 + + /* [EO]ABI rt_sigreturn */ + slot 1 + raw_syscall __NR_rt_sigreturn + + .cfi_endproc + + /* FDPIC sigreturn */ + .cfi_startproc + cfi_fdpic_pc SIGFRAME_RC3_OFFSET + cfi_fdpic_r9 SIGFRAME_RC3_OFFSET + + slot 2 + fdpic_thunk SIGFRAME_RC3_OFFSET + .cfi_endproc + + /* FDPIC rt_sigreturn */ + .cfi_startproc + cfi_fdpic_pc RT_SIGFRAME_RC3_OFFSET + cfi_fdpic_r9 RT_SIGFRAME_RC3_OFFSET + + slot 3 + fdpic_thunk RT_SIGFRAME_RC3_OFFSET + .cfi_endproc + + .balign 16 +endf sigreturn_codes diff --git a/linux-user/arm/vdso.ld b/linux-user/arm/vdso.ld new file mode 100644 index 0000000000..3b00adf27a --- /dev/null +++ b/linux-user/arm/vdso.ld @@ -0,0 +1,67 @@ +/* + * Linker script for linux arm replacement vdso. + * + * Copyright 2023 Linaro, Ltd. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +VERSION { + LINUX_2.6 { + global: + __vdso_clock_gettime; + __vdso_gettimeofday; + __vdso_clock_getres; + __vdso_clock_gettime64; + + local: *; + }; +} + + +PHDRS { + phdr PT_PHDR FLAGS(4) PHDRS; + load PT_LOAD FLAGS(7) FILEHDR PHDRS; /* FLAGS=RWX */ + dynamic PT_DYNAMIC FLAGS(4); + eh_frame_hdr PT_GNU_EH_FRAME; + note PT_NOTE FLAGS(4); +} + +SECTIONS { + . = 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*) } :load :note + .dynamic : { *(.dynamic) } :load :dynamic + .dynsym : { *(.dynsym) } :load + /* + * There ought not be any real read-write data. + * But since we manipulated the segment layout, + * we have to put these sections somewhere. + */ + .data : { + *(.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) } :load :eh_frame_hdr + .eh_frame : { *(.eh_frame) } :load + + .text : { *(.text*) } :load +}