From patchwork Tue Jun 25 14:58:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13711457 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2970DC2BBCA for ; Tue, 25 Jun 2024 15:04:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B00136B00C6; Tue, 25 Jun 2024 11:04:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AB01B6B00C7; Tue, 25 Jun 2024 11:04:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 929336B00C8; Tue, 25 Jun 2024 11:04:55 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 6F68C6B00C6 for ; Tue, 25 Jun 2024 11:04:55 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 9EDE5A080B for ; Tue, 25 Jun 2024 15:04:54 +0000 (UTC) X-FDA: 82269733308.14.C0F3ADD Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by imf19.hostedemail.com (Postfix) with ESMTP id DF3101A0022 for ; Tue, 25 Jun 2024 15:04:51 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="B9/+eD8H"; spf=pass (imf19.hostedemail.com: domain of broonie@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=broonie@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1719327884; a=rsa-sha256; cv=none; b=Uje00kPBLricVCHlDh4l9zlhZ5CD64M0CBtBi18vufBdr11KqVb3osRbt433jeemB+UqsX ZtrhQPKnnbrO8zskqaLtxErzSBdyjrtoWwY6SLb1SYqkwQdcJxmeyY+6JA3+3cpyHlfAz8 tv8+GU80OaQiKAGE3bP9obLWU4Q/bX8= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="B9/+eD8H"; spf=pass (imf19.hostedemail.com: domain of broonie@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=broonie@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1719327884; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3Jha9xXlI6eXPmoCvZEt3tepTTT+aH8aO/t6Ev+AFq8=; b=liI02+0Tqg6Z/rsDFdQZIwHRjhTy3BaMt7LX3lDvYdJORdlfHB26k232Nd4pgzZ4UiFrNm Nil0KpkUEs1rjeMfcGMSviwDDNtsaSkX2/4k2I/AeOmCSrs0sUrOvYgLl9nikCJznVnhha s30OrIrYlBbEUlqocVK7w2RHWgPboBM= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id CDC6BCE1AD3; Tue, 25 Jun 2024 15:04:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 424F7C32781; Tue, 25 Jun 2024 15:04:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719327888; bh=uHJiYcvljzUX8f4hJI4pgvGmhWWcFPMp0a5s58eHg1Q=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=B9/+eD8H/b4txlwb0fKoLsaf1vEzp0vHCKL3eP5ZYdl5m3fIQnZe4kprD4iN5GUOP uHWFJ7DM+IO8qM0oWr6Ny6cRoGFWyq9OzMN2uKIzhI2F8LrNBNCOHB3BMSz8Xrd64S 4cNYJyEFXuKSIzvZqolFq/lqY7J+Vg0Y010/1wCs29imOkytDf7VIDSBu3W3yCQnMU 5DpKRXwbihbnYXOAjmjoR6hD0cTneP/t5M1OTLbTFcJKPMTdgq6wnZ8fbWoSAYEgg3 udfC5wXImn8NqBNI2qMKhDMOu0VioWY10by7w2PBQ26+hxjh43zWDRgYi/MMRWqu0D +mXWQfOdpnjuw== From: Mark Brown Date: Tue, 25 Jun 2024 15:58:02 +0100 Subject: [PATCH v9 34/39] kselftest/arm64: Add very basic GCS test program MIME-Version: 1.0 Message-Id: <20240625-arm64-gcs-v9-34-0f634469b8f0@kernel.org> References: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> In-Reply-To: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=13330; i=broonie@kernel.org; h=from:subject:message-id; bh=uHJiYcvljzUX8f4hJI4pgvGmhWWcFPMp0a5s58eHg1Q=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmetuNgEZntme6jAr9UtH0VfGfGf/1dLXYaQNm0rST 31Q8lLWJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZnrbjQAKCRAk1otyXVSH0O/TB/ 9PIUSIFlzJOt7RtwV6XRF+NWmZqUEZqn9f2taXUenbTzGZDCjjCb09wh6bZi0bGTcVo5It0KLkMTLT vLYhVUHHI6FTJY/x0yc1+rjXjcK2IJNKMw6DqU7tJTrcNRUTSanUB+s5hj+OiRfLMQ88aC4i9S21BI M89wFfmGQ0w1px6MVrX+0dU7vBIYZ2Eb7gzu/+OO0D0S9HTe00gbCkjAY03lcjVKrTtURecyIGizcP vdqLeHVFJEaAs41vEVEJnCZxj19A38n5g2VsMi3Y+DtXXclKPxDE2EWzl6uNRFFyHoaGK/rxXaa5uj HYTMdEeSw/7i/GpphaAIkCdoSQXEEx X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-Stat-Signature: ijakskdn1yxbrom4w8nb5m9wtids7k5i X-Rspamd-Queue-Id: DF3101A0022 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1719327891-984636 X-HE-Meta: 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 NiG9Q05+ JZkkwduBRmF1DSNnbXIbVqt2vrj7aG2SFHAOMBA8OXn9c4Blm1NHQXHyW/FoZ8CHTPhT5joUWw2j4qD06mdUL3MLFU732ySEJXBQn60/+tX5LFgD4Bmw4HiqRs5ChGAbs825USGBFYmCNZhhyEbIHzYe+ifq6DnSgq0CWzsFkVqRrsUQQLnO8G7SViuD9Oe4qrCXOctskyplvPH238ICd1yvm9s8yFuTeFY/7hF1p53/prL2UnTTAM2UgJnvlo8xtQs8i6vxKr+z6ragaYhf/DMya/bMzVxgYHauhekrYpxRqgeWx7aXv+Pt1Ai/K/W0yLRtKprBGYoPR4+bFTyd757/Co0PLHy7B5T2YaEpg5LcxszZnEg4U6dGlL0xUKMUPAOSe X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This test program just covers the basic GCS ABI, covering aspects of the ABI as standalone features without attempting to integrate things. Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mark Brown --- tools/testing/selftests/arm64/Makefile | 2 +- tools/testing/selftests/arm64/gcs/.gitignore | 1 + tools/testing/selftests/arm64/gcs/Makefile | 18 ++ tools/testing/selftests/arm64/gcs/basic-gcs.c | 357 ++++++++++++++++++++++++++ tools/testing/selftests/arm64/gcs/gcs-util.h | 90 +++++++ 5 files changed, 467 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile index 28b93cab8c0d..22029e60eff3 100644 --- a/tools/testing/selftests/arm64/Makefile +++ b/tools/testing/selftests/arm64/Makefile @@ -4,7 +4,7 @@ ARCH ?= $(shell uname -m 2>/dev/null || echo not) ifneq (,$(filter $(ARCH),aarch64 arm64)) -ARM64_SUBTARGETS ?= tags signal pauth fp mte bti abi +ARM64_SUBTARGETS ?= tags signal pauth fp mte bti abi gcs else ARM64_SUBTARGETS := endif diff --git a/tools/testing/selftests/arm64/gcs/.gitignore b/tools/testing/selftests/arm64/gcs/.gitignore new file mode 100644 index 000000000000..0e5e695ecba5 --- /dev/null +++ b/tools/testing/selftests/arm64/gcs/.gitignore @@ -0,0 +1 @@ +basic-gcs diff --git a/tools/testing/selftests/arm64/gcs/Makefile b/tools/testing/selftests/arm64/gcs/Makefile new file mode 100644 index 000000000000..61a30f483429 --- /dev/null +++ b/tools/testing/selftests/arm64/gcs/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2023 ARM Limited +# +# In order to avoid interaction with the toolchain and dynamic linker the +# portions of these tests that interact with the GCS are implemented using +# nolibc. +# + +TEST_GEN_PROGS := basic-gcs + +include ../../lib.mk + +$(OUTPUT)/basic-gcs: basic-gcs.c + $(CC) -g -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib \ + -static -include ../../../../include/nolibc/nolibc.h \ + -I../../../../../usr/include \ + -std=gnu99 -I../.. -g \ + -ffreestanding -Wall $^ -o $@ -lgcc diff --git a/tools/testing/selftests/arm64/gcs/basic-gcs.c b/tools/testing/selftests/arm64/gcs/basic-gcs.c new file mode 100644 index 000000000000..3fb9742342a3 --- /dev/null +++ b/tools/testing/selftests/arm64/gcs/basic-gcs.c @@ -0,0 +1,357 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 ARM Limited. + */ + +#include +#include + +#include + +#include +#include +#include + +#include "kselftest.h" +#include "gcs-util.h" + +/* nolibc doesn't have sysconf(), just hard code the maximum */ +static size_t page_size = 65536; + +static __attribute__((noinline)) void valid_gcs_function(void) +{ + /* Do something the compiler can't optimise out */ + my_syscall1(__NR_prctl, PR_SVE_GET_VL); +} + +static inline int gcs_set_status(unsigned long mode) +{ + bool enabling = mode & PR_SHADOW_STACK_ENABLE; + int ret; + unsigned long new_mode; + + /* + * The prctl takes 1 argument but we need to ensure that the + * other 3 values passed in registers to the syscall are zero + * since the kernel validates them. + */ + ret = my_syscall5(__NR_prctl, PR_SET_SHADOW_STACK_STATUS, mode, + 0, 0, 0); + + if (ret == 0) { + ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, + &new_mode, 0, 0, 0); + if (ret == 0) { + if (new_mode != mode) { + ksft_print_msg("Mode set to %lx not %lx\n", + new_mode, mode); + ret = -EINVAL; + } + } else { + ksft_print_msg("Failed to validate mode: %d\n", ret); + } + + if (enabling != chkfeat_gcs()) { + ksft_print_msg("%senabled by prctl but %senabled in CHKFEAT\n", + enabling ? "" : "not ", + chkfeat_gcs() ? "" : "not "); + ret = -EINVAL; + } + } + + return ret; +} + +/* Try to read the status */ +static bool read_status(void) +{ + unsigned long state; + int ret; + + ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, + &state, 0, 0, 0); + if (ret != 0) { + ksft_print_msg("Failed to read state: %d\n", ret); + return false; + } + + return state & PR_SHADOW_STACK_ENABLE; +} + +/* Just a straight enable */ +static bool base_enable(void) +{ + int ret; + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE); + if (ret) { + ksft_print_msg("PR_SHADOW_STACK_ENABLE failed %d\n", ret); + return false; + } + + return true; +} + +/* Check we can read GCSPR_EL0 when GCS is enabled */ +static bool read_gcspr_el0(void) +{ + unsigned long *gcspr_el0; + + ksft_print_msg("GET GCSPR\n"); + gcspr_el0 = get_gcspr(); + ksft_print_msg("GCSPR_EL0 is %p\n", gcspr_el0); + + return true; +} + +/* Also allow writes to stack */ +static bool enable_writeable(void) +{ + int ret; + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_WRITE); + if (ret) { + ksft_print_msg("PR_SHADOW_STACK_ENABLE writeable failed: %d\n", ret); + return false; + } + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE); + if (ret) { + ksft_print_msg("failed to restore plain enable %d\n", ret); + return false; + } + + return true; +} + +/* Also allow writes to stack */ +static bool enable_push_pop(void) +{ + int ret; + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_PUSH); + if (ret) { + ksft_print_msg("PR_SHADOW_STACK_ENABLE with push failed: %d\n", + ret); + return false; + } + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE); + if (ret) { + ksft_print_msg("failed to restore plain enable %d\n", ret); + return false; + } + + return true; +} + +/* Enable GCS and allow everything */ +static bool enable_all(void) +{ + int ret; + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_PUSH | + PR_SHADOW_STACK_WRITE); + if (ret) { + ksft_print_msg("PR_SHADOW_STACK_ENABLE with everything failed: %d\n", + ret); + return false; + } + + ret = gcs_set_status(PR_SHADOW_STACK_ENABLE); + if (ret) { + ksft_print_msg("failed to restore plain enable %d\n", ret); + return false; + } + + return true; +} + +static bool enable_invalid(void) +{ + int ret = gcs_set_status(ULONG_MAX); + if (ret == 0) { + ksft_print_msg("GCS_SET_STATUS %lx succeeded\n", ULONG_MAX); + return false; + } + + return true; +} + +/* Map a GCS */ +static bool map_guarded_stack(void) +{ + int ret; + uint64_t *buf; + uint64_t expected_cap; + int elem; + bool pass = true; + + buf = (void *)my_syscall3(__NR_map_shadow_stack, 0, page_size, + SHADOW_STACK_SET_MARKER | + SHADOW_STACK_SET_TOKEN); + if (buf == MAP_FAILED) { + ksft_print_msg("Failed to map %lu byte GCS: %d\n", + page_size, errno); + return false; + } + ksft_print_msg("Mapped GCS at %p-%p\n", buf, + (void *)((uint64_t)buf + page_size)); + + /* The top of the newly allocated region should be 0 */ + elem = (page_size / sizeof(uint64_t)) - 1; + if (buf[elem]) { + ksft_print_msg("Last entry is 0x%llx not 0x0\n", buf[elem]); + pass = false; + } + + /* Then a valid cap token */ + elem--; + expected_cap = ((uint64_t)buf + page_size - 16); + expected_cap &= GCS_CAP_ADDR_MASK; + expected_cap |= GCS_CAP_VALID_TOKEN; + if (buf[elem] != expected_cap) { + ksft_print_msg("Cap entry is 0x%llx not 0x%llx\n", + buf[elem], expected_cap); + pass = false; + } + ksft_print_msg("cap token is 0x%llx\n", buf[elem]); + + /* The rest should be zeros */ + for (elem = 0; elem < page_size / sizeof(uint64_t) - 2; elem++) { + if (!buf[elem]) + continue; + ksft_print_msg("GCS slot %d is 0x%llx not 0x0\n", + elem, buf[elem]); + pass = false; + } + + ret = munmap(buf, page_size); + if (ret != 0) { + ksft_print_msg("Failed to unmap %ld byte GCS: %d\n", + page_size, errno); + pass = false; + } + + return pass; +} + +/* A fork()ed process can run */ +static bool test_fork(void) +{ + unsigned long child_mode; + int ret, status; + pid_t pid; + bool pass = true; + + pid = fork(); + if (pid == -1) { + ksft_print_msg("fork() failed: %d\n", errno); + pass = false; + goto out; + } + if (pid == 0) { + /* In child, make sure we can call a function, read + * the GCS pointer and status and then exit */ + valid_gcs_function(); + get_gcspr(); + + ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, + &child_mode, 0, 0, 0); + if (ret == 0 && !(child_mode & PR_SHADOW_STACK_ENABLE)) { + ksft_print_msg("GCS not enabled in child\n"); + ret = -EINVAL; + } + + exit(ret); + } + + /* + * In parent, check we can still do function calls then block + * for the child. + */ + valid_gcs_function(); + + ksft_print_msg("Waiting for child %d\n", pid); + + ret = waitpid(pid, &status, 0); + if (ret == -1) { + ksft_print_msg("Failed to wait for child: %d\n", + errno); + return false; + } + + if (!WIFEXITED(status)) { + ksft_print_msg("Child exited due to signal %d\n", + WTERMSIG(status)); + pass = false; + } else { + if (WEXITSTATUS(status)) { + ksft_print_msg("Child exited with status %d\n", + WEXITSTATUS(status)); + pass = false; + } + } + +out: + + return pass; +} + +typedef bool (*gcs_test)(void); + +static struct { + char *name; + gcs_test test; + bool needs_enable; +} tests[] = { + { "read_status", read_status }, + { "base_enable", base_enable, true }, + { "read_gcspr_el0", read_gcspr_el0 }, + { "enable_writeable", enable_writeable, true }, + { "enable_push_pop", enable_push_pop, true }, + { "enable_all", enable_all, true }, + { "enable_invalid", enable_invalid, true }, + { "map_guarded_stack", map_guarded_stack }, + { "fork", test_fork }, +}; + +int main(void) +{ + int i, ret; + unsigned long gcs_mode; + + ksft_print_header(); + + /* + * We don't have getauxval() with nolibc so treat a failure to + * read GCS state as a lack of support and skip. + */ + ret = my_syscall5(__NR_prctl, PR_GET_SHADOW_STACK_STATUS, + &gcs_mode, 0, 0, 0); + if (ret != 0) + ksft_exit_skip("Failed to read GCS state: %d\n", ret); + + if (!(gcs_mode & PR_SHADOW_STACK_ENABLE)) { + gcs_mode = PR_SHADOW_STACK_ENABLE; + ret = my_syscall5(__NR_prctl, PR_SET_SHADOW_STACK_STATUS, + gcs_mode, 0, 0, 0); + if (ret != 0) + ksft_exit_fail_msg("Failed to enable GCS: %d\n", ret); + } + + ksft_set_plan(ARRAY_SIZE(tests)); + + for (i = 0; i < ARRAY_SIZE(tests); i++) { + ksft_test_result((*tests[i].test)(), "%s\n", tests[i].name); + } + + /* One last test: disable GCS, we can do this one time */ + my_syscall5(__NR_prctl, PR_SET_SHADOW_STACK_STATUS, 0, 0, 0, 0); + if (ret != 0) + ksft_print_msg("Failed to disable GCS: %d\n", ret); + + ksft_finished(); + + return 0; +} diff --git a/tools/testing/selftests/arm64/gcs/gcs-util.h b/tools/testing/selftests/arm64/gcs/gcs-util.h new file mode 100644 index 000000000000..1ae6864d3f86 --- /dev/null +++ b/tools/testing/selftests/arm64/gcs/gcs-util.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 ARM Limited. + */ + +#ifndef GCS_UTIL_H +#define GCS_UTIL_H + +#include + +#ifndef __NR_map_shadow_stack +#define __NR_map_shadow_stack 453 +#endif + +#ifndef __NR_prctl +#define __NR_prctl 167 +#endif + +/* Shadow Stack/Guarded Control Stack interface */ +#define PR_GET_SHADOW_STACK_STATUS 74 +#define PR_SET_SHADOW_STACK_STATUS 75 +#define PR_LOCK_SHADOW_STACK_STATUS 76 + +# define PR_SHADOW_STACK_ENABLE (1UL << 0) +# define PR_SHADOW_STACK_WRITE (1UL << 1) +# define PR_SHADOW_STACK_PUSH (1UL << 2) + +#define PR_SHADOW_STACK_ALL_MODES \ + PR_SHADOW_STACK_ENABLE | PR_SHADOW_STACK_WRITE | PR_SHADOW_STACK_PUSH + +#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */ +#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack merker in the shadow stack */ + +#define GCS_CAP_ADDR_MASK (0xfffffffffffff000UL) +#define GCS_CAP_TOKEN_MASK (0x0000000000000fffUL) +#define GCS_CAP_VALID_TOKEN 1 +#define GCS_CAP_IN_PROGRESS_TOKEN 5 + +#define GCS_CAP(x) (((unsigned long)(x) & GCS_CAP_ADDR_MASK) | \ + GCS_CAP_VALID_TOKEN) + +static inline unsigned long *get_gcspr(void) +{ + unsigned long *gcspr; + + asm volatile( + "mrs %0, S3_3_C2_C5_1" + : "=r" (gcspr) + : + : "cc"); + + return gcspr; +} + +static inline void __attribute__((always_inline)) gcsss1(unsigned long *Xt) +{ + asm volatile ( + "sys #3, C7, C7, #2, %0\n" + : + : "rZ" (Xt) + : "memory"); +} + +static inline unsigned long __attribute__((always_inline)) *gcsss2(void) +{ + unsigned long *Xt; + + asm volatile( + "SYSL %0, #3, C7, C7, #3\n" + : "=r" (Xt) + : + : "memory"); + + return Xt; +} + +static inline bool chkfeat_gcs(void) +{ + register long val __asm__ ("x16") = 1; + + /* CHKFEAT x16 */ + asm volatile( + "hint #0x28\n" + : "=r" (val) + : "r" (val)); + + return val != 1; +} + +#endif