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65383082bf
We use this for detecting the Arm crypto extension and using it to
enable accelerated AES and/or SHA-{1,2}. Previously, I had code that
called glibc's getauxval(3) function, conditioned on #ifdef __linux__.
Now, instead, I do an autoconf test to query the presence of getauxval
itself (so that any other system with the same API can still work),
and alongside it, also check for the analogous FreeBSD libc function
elf_aux_info(3). As a result, building on Arm FreeBSD now gets the
accelerated-crypto autodetection.
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
#include "putty.h"
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#include "ssh.h"
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#if defined __arm__ || defined __aarch64__
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_AUXV_H
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#include <sys/auxv.h>
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#endif
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#ifdef HAVE_ASM_HWCAP_H
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#include <asm/hwcap.h>
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#endif
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#if defined HAVE_GETAUXVAL
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/* No code needed: getauxval has just the API we want already */
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#elif defined HAVE_ELF_AUX_INFO
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/* Implement the simple getauxval API in terms of FreeBSD elf_aux_info */
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static inline u_long getauxval(int which)
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{
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u_long toret;
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if (elf_aux_info(which, &toret, sizeof(toret)) != 0)
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return 0; /* elf_aux_info didn't work */
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return toret;
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}
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#else
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/* Implement a stub getauxval which returns no capabilities */
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static inline u_long getauxval(int which) { return 0; }
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#endif
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bool platform_aes_hw_available(void)
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{
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#if defined HWCAP_AES
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return getauxval(AT_HWCAP) & HWCAP_AES;
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#elif defined HWCAP2_AES
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return getauxval(AT_HWCAP2) & HWCAP2_AES;
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#else
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return false;
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#endif
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}
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bool platform_sha256_hw_available(void)
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{
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#if defined HWCAP_SHA2
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return getauxval(AT_HWCAP) & HWCAP_SHA2;
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#elif defined HWCAP2_SHA2
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return getauxval(AT_HWCAP2) & HWCAP2_SHA2;
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#else
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return false;
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#endif
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}
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bool platform_sha1_hw_available(void)
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{
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#if defined HWCAP_SHA1
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return getauxval(AT_HWCAP) & HWCAP_SHA1;
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#elif defined HWCAP2_SHA1
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return getauxval(AT_HWCAP2) & HWCAP2_SHA1;
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#else
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return false;
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#endif
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}
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#endif /* defined __arm__ || defined __aarch64__ */
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