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c612289b77
Running LSX instructions requires both the hardware support and the kernel support. The `cpucfg` instruction only tests the hardware support, causing a SIGILL if the hardware supports LSX but the kernel does not. Use `getauxval(AT_HWCAP)` as the ["Software Development and Build Convention for LoongArch Architectures"][1] manual suggests. The LOONGARCH_HWCAP_LSX and LOONGARCH_HWCAP_LASX bits are copied from the manual too. In Glibc 2.38 they'll be provided by <sys/auxv.h> as well, but they are unavailable in earlier Glibc versions so we cannot rely on it. The getauxval syscall and Glibc wrapper are available since day one (Linux-5.19 and Glibc-2.36) for LoongArch. Fixes #21508. [1]:https://github.com/loongson/la-softdev-convention/blob/master/la-softdev-convention.adoc#kernel-constraints Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/21509)
18 lines
512 B
C
18 lines
512 B
C
/*
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* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <sys/auxv.h>
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#include "loongarch_arch.h"
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unsigned int OPENSSL_loongarch_hwcap_P = 0;
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void OPENSSL_cpuid_setup(void)
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{
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OPENSSL_loongarch_hwcap_P = getauxval(AT_HWCAP);
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}
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