From nobody Sat Nov 15 10:38:43 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1754180227; cv=none; d=zohomail.com; s=zohoarc; b=TdQNykPPbMWWwq/FfOUMDn0M60JGTN+FrSJZN0BBjc49T6aExxbpJL+S2qGnDJAKBd/1PpH35tXJm1FHUMtXWWvE+m7il9IYqsxUxa50IWdsWqIWNBVwOhypVPo7yBeyo2REs/pGE+B8GPmheSTE4uj4YXtXTXwlbRzFP+iDlhc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1754180227; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=L1ak1ZU/AR0+1y4HNoJj/qDB25/smzJJgjU2bzP6iSw=; b=FN3bLn924PakcaHnOzhalFag49gfaPDZmXoSwWQqsx9l3QpmU46zX886cKlZkvQAJ9+rKWv+VPHpUxDnUhFbO5IYbxcco+J+6WEDTBDC4EiFVInKD1Tgclpps7eIYIdW7XBru/PCoWAfgvziFU2YW1oRRAyI83nCMW5x8y0Xqpw= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1754180227131205.19615411767086; Sat, 2 Aug 2025 17:17:07 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uiLxs-0006De-FA; Sat, 02 Aug 2025 19:48:38 -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 1uiLsE-0004aX-FV for qemu-devel@nongnu.org; Sat, 02 Aug 2025 19:42:53 -0400 Received: from mail-yw1-x1132.google.com ([2607:f8b0:4864:20::1132]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1uiLsC-0006tl-Rj for qemu-devel@nongnu.org; Sat, 02 Aug 2025 19:42:46 -0400 Received: by mail-yw1-x1132.google.com with SMTP id 00721157ae682-71a39f93879so43443217b3.0 for ; Sat, 02 Aug 2025 16:42:44 -0700 (PDT) Received: from stoup.. ([172.58.111.133]) by smtp.gmail.com with ESMTPSA id 00721157ae682-71b5a423f38sm18461527b3.40.2025.08.02.16.42.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Aug 2025 16:42:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1754178163; x=1754782963; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=L1ak1ZU/AR0+1y4HNoJj/qDB25/smzJJgjU2bzP6iSw=; b=bHVFX6cRhnJ5h2MOrnOub9olzuajmAnB5ToZ4/h/vhjlXtna3EnbbS32KCr2lYLi7v t9Kl4Ml8IyjzIsY1GsCM/5Av8uwQlzRvOFAdcSBs56Hw7SpCkug3KnI/P0ASO8kfe2fy 4WMdicdTrRlP2xrlCpizJeZJF4cDBsqaxBIU0W0sjJUKM2dfWJ8/WXTcbnkosv+wyK/G L+m54hJhEaIeunNAeXir+QGzArrlwb4iUoJUCSsvkrFMbi4acBf5XIUbqQqyfnlOkGMj oMo9s0dquRJzo8fn+/W4c5YPriXfcwvA3pPQ9hXP6OTylfy0kMzEs78+F55Y8+mrmKhU BfJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754178163; x=1754782963; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=L1ak1ZU/AR0+1y4HNoJj/qDB25/smzJJgjU2bzP6iSw=; b=Oga5TPoBuqJExaDCxQjwvtGEQeAxdDs31CoDmqFI2W5M+cI/6A8GDTPNTtVk/MYTXK 2ZWu3Wh/UQ/deESJaW5osbOCULfk7uO/1linzhlgf3WCEZt84afiYJ5mQf7lYO9Gqgae CRRGwPfjo6G9HVd6c1i3UVJH+1wgmWWjlQvuzxb2GyMKbzpg+CFSl9gt+TFbPOhMcoLD ahQaIt+3+4xGgPrVEeYm+640H1ssdpzwxhauvWE32uB8C+3XaITUCZ8e4cRPYbTZ1PLf dTm/N2EZvtiYPtNZIcDSlzT/TQ4oJ1I7Sccg5EcuS8V4PX25d0ih9svxwT0qx2WEF3Gf Fn1g== X-Gm-Message-State: AOJu0YzIYquU6yPSVvb+ldi9OOVLZuvQDvA+uZv5OIvO2/JoHH2Opm3F Dgc7UBSZ7Tu1eAwwAoFy/pj1DXMa8yIWEtEjtxvKR6mT5BDFe0UNnoes8NCncs/+/8ohYwpOMy3 lV5As/zI= X-Gm-Gg: ASbGncs7m9h3qUui17LcRNag0yTfXZ10d/bFrBiN0MCy+I16rXAuEiaBwVRQhVJKD2Q 2qvTp/aI6Pjz10oj/h7shMUx4HobGTLOvWTB+682/NOs7NMnMlv+r00AQdj69edoO8xFML8B4gA KLU6Si82Qn6irj+g6R4cTuEixhCdMTQ/hDIrU99B8vyH7XW501cFc4jArFIU7Xgbuhq2ErVwUaE nb0yuJgJoKcsR7JVNxAnCmokOJ071HEy11Zvti32ag7+7cAshw2NMQCGkruEKOF5xvWZ2O3qAsT ysIR1yZR004all1vHsgmxV2AZd1bkd+nOvK+UFYOSk3TyhipedmobTCXVCC+7U7AwJm5rLQuhUe N8G1aUKhuSKOSt7WS0SgRoMLnpI2hPJU89K76verevEudbnsQ4JHE X-Google-Smtp-Source: AGHT+IF9NFvaNOKhXcz62pjxStwnQKSB/FE6G2Hf22mP9LCryNxA4mVg0eE/bEQplMzcpntFJv0hWA== X-Received: by 2002:a05:690c:660f:b0:71a:231b:d046 with SMTP id 00721157ae682-71b5a6e54fbmr143797507b3.2.1754178163565; Sat, 02 Aug 2025 16:42:43 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pierrick Bouvier Subject: [PATCH v2 85/85] tests/tcg/aarch64: Add gcsss Date: Sun, 3 Aug 2025 09:29:53 +1000 Message-ID: <20250802232953.413294-86-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250802232953.413294-1-richard.henderson@linaro.org> References: <20250802232953.413294-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1132; envelope-from=richard.henderson@linaro.org; helo=mail-yw1-x1132.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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1754180229147124100 Content-Type: text/plain; charset="utf-8" Validate stack switching and recursion depth. Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- tests/tcg/aarch64/gcs.h | 9 ++++ tests/tcg/aarch64/gcsss.c | 74 +++++++++++++++++++++++++++++++ tests/tcg/aarch64/Makefile.target | 2 +- 3 files changed, 84 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/aarch64/gcsss.c diff --git a/tests/tcg/aarch64/gcs.h b/tests/tcg/aarch64/gcs.h index 99cb4d4e38..e821963cb8 100644 --- a/tests/tcg/aarch64/gcs.h +++ b/tests/tcg/aarch64/gcs.h @@ -69,3 +69,12 @@ =20 #define gcspr() \ ({ uint64_t *r; asm volatile("mrs %0, s3_3_c2_c5_1" : "=3Dr"(r)); r; }) + +#define gcsss1(val) \ + do { = \ + asm volatile("sys #3, c7, c7, #2, %0" : : "r"(val) : "memory"); = \ + } while (0) + +#define gcsss2() \ + ({ uint64_t *r; = \ + asm volatile("sysl %0, #3, c7, c7, #3" : "=3Dr"(r) : : "memory"); r= ; }) diff --git a/tests/tcg/aarch64/gcsss.c b/tests/tcg/aarch64/gcsss.c new file mode 100644 index 0000000000..9550c68e7e --- /dev/null +++ b/tests/tcg/aarch64/gcsss.c @@ -0,0 +1,74 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include "gcs.h" + +#define IN_PROGRESS(X) ((uint64_t)(X) | 5) +#define CAP(X) (((uint64_t)(X) & ~0xfff) + 1) + +static uint64_t * __attribute__((noinline)) recurse(size_t index) +{ + if (index =3D=3D 0) { + return gcspr(); + } + return recurse(index - 1); +} + +int main() +{ + void *tmp; + uint64_t *alt_stack, *alt_cap; + uint64_t *orig_pr, *orig_cap; + uint64_t *bottom; + size_t pagesize =3D getpagesize(); + size_t words; + + enable_gcs(0); + orig_pr =3D gcspr(); + + /* Allocate a guard page before and after. */ + tmp =3D mmap(0, 3 * pagesize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0= ); + assert(tmp !=3D MAP_FAILED); + + /* map_shadow_stack won't replace existing mappings */ + munmap(tmp + pagesize, pagesize); + + /* Allocate a new stack between the guards. */ + alt_stack =3D (uint64_t *) + syscall(__NR_map_shadow_stack, tmp + pagesize, pagesize, + SHADOW_STACK_SET_TOKEN); + assert(alt_stack =3D=3D tmp + pagesize); + + words =3D pagesize / 8; + alt_cap =3D alt_stack + words - 1; + + /* SHADOW_STACK_SET_TOKEN set the cap. */ + assert(*alt_cap =3D=3D CAP(alt_cap)); + + /* Swap to the alt stack, one step at a time. */ + gcsss1(alt_cap); + + assert(gcspr() =3D=3D alt_cap); + assert(*alt_cap =3D=3D IN_PROGRESS(orig_pr)); + + orig_cap =3D gcsss2(); + + assert(orig_cap =3D=3D orig_pr - 1); + assert(*orig_cap =3D=3D CAP(orig_cap)); + assert(gcspr() =3D=3D alt_stack + words); + + /* We should be able to use the whole stack. */ + bottom =3D recurse(words - 1); + assert(bottom =3D=3D alt_stack); + + /* We should be back where we started. */ + assert(gcspr() =3D=3D alt_stack + words); + + /* Swap back to the original stack. */ + gcsss1(orig_cap); + tmp =3D gcsss2(); + + assert(gcspr() =3D=3D orig_pr); + assert(tmp =3D=3D alt_cap); + + exit(0); +} diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile= .target index c6f401c317..b858f8692e 100644 --- a/tests/tcg/aarch64/Makefile.target +++ b/tests/tcg/aarch64/Makefile.target @@ -76,7 +76,7 @@ $(SME_TESTS): CFLAGS +=3D $(CROSS_AS_HAS_ARMV9_SME) endif =20 # GCS Tests -GCS_TESTS +=3D gcsstr gcspushm +GCS_TESTS +=3D gcsstr gcspushm gcsss AARCH64_TESTS +=3D $(GCS_TESTS) $(GCS_TESTS): gcs.h =20 --=20 2.43.0