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Fix detection of ARMv7 and ARM64 CPU features on FreeBSD

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OpenSSL assumes AT_HWCAP = 16 (as on Linux), but on FreeBSD AT_HWCAP = 25
Switch to using AT_HWCAP, and setting it to 16 if it is not defined.

OpenSSL calls elf_auxv_info() with AT_CANARY which returns ENOENT
resulting in all ARM acceleration features being disabled.

CLA: trivial

Reviewed-by: Ben Kaduk <kaduk@mit.edu>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17082)
This commit is contained in:
Allan Jude 2021-11-19 15:14:30 +00:00 committed by Tomas Mraz
parent 0e9a265e42
commit c1dabe26e3
1 changed files with 9 additions and 6 deletions
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15
crypto/armcap.c
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@ -112,20 +112,23 @@ static unsigned long getauxval(unsigned long key)
* ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
* AArch64 used AT_HWCAP.
*/
# ifndef AT_HWCAP
# define AT_HWCAP 16
# endif
# ifndef AT_HWCAP2
# define AT_HWCAP2 26
# endif
# if defined(__arm__) || defined (__arm)
# define HWCAP 16
/* AT_HWCAP */
# define HWCAP AT_HWCAP
# define HWCAP_NEON (1 << 12)
# define HWCAP_CE 26
/* AT_HWCAP2 */
# define HWCAP_CE AT_HWCAP2
# define HWCAP_CE_AES (1 << 0)
# define HWCAP_CE_PMULL (1 << 1)
# define HWCAP_CE_SHA1 (1 << 2)
# define HWCAP_CE_SHA256 (1 << 3)
# elif defined(__aarch64__)
# define HWCAP 16
/* AT_HWCAP */
# define HWCAP AT_HWCAP
# define HWCAP_NEON (1 << 1)
# define HWCAP_CE HWCAP