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![Stefan Agner](/assets/img/avatar_default.png)
The LLVM Target parser currently does not allow to specify the security extension as part of -march (see also LLVM Bug 40186 [0]). When trying to use Clang with LLVM's integrated assembler, this leads to build errors such as this: clang-8: error: the clang compiler does not support '-Wa,-march=armv7-a+sec' Use ".arch_extension sec" to enable the security extension in a more portable fasion. Also make sure to use ".arch armv7-a" in case a v6/v7 multi-platform kernel is being built. Note that this is technically not exactly the same as the old code checked for availabilty of the security extension by calling as-instr. However, there are already other sites which use ".arch_extension sec" unconditionally, hence de-facto we need an assembler capable of ".arch_extension sec" already today (arch/arm/mm/proc-v7.S). The arch extension "sec" is available since binutils 2.21 according to its documentation [1]. [0] https://bugs.llvm.org/show_bug.cgi?id=40186 [1] https://sourceware.org/binutils/docs-2.21/as/ARM-Options.html Signed-off-by: Stefan Agner <stefan@agner.ch> Acked-by: Mans Rullgard <mans@mansr.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Olof Johansson <olof@lixom.net>
20 lines
412 B
ArmAsm
20 lines
412 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 Samsung Electronics.
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*
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* Copied from omap-smc.S Copyright (C) 2010 Texas Instruments, Inc.
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*/
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#include <linux/linkage.h>
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/*
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* Function signature: void exynos_smc(u32 cmd, u32 arg1, u32 arg2, u32 arg3)
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*/
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.arch armv7-a
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.arch_extension sec
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ENTRY(exynos_smc)
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stmfd sp!, {r4-r11, lr}
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dsb
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smc #0
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ldmfd sp!, {r4-r11, pc}
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ENDPROC(exynos_smc)
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