Disable libcrypto assembly on arm.

The arm CPU capability detection is uses SIGILL and is unsafe to call from
some contexts. Furthermore, this is only useful to detect NEON support,
which is then unused on OpenBSD due to __STRICT_ALIGNMENT. Requiring a
minimum of ARMv7+VFP+NEON is also not unreasonable.

The SHA-1, SHA-256 and SHA-512 (non-NEON) C code performs within ~5% of
the assembly, as does RSA when using the C based Montgomery multiplication.
The C versions of AES and GHASH code are around ~40-50% of the assembly,
howeer if you care about performance you really want to use
Chacha20Poly1305 on this platform.

This will enable further clean up to proceed.

ok joshua@ kinjiro@ tb@

1 files changed, 0 insertions, 88 deletions

diff --git a/src/lib/libcrypto/arch/arm/armcap.c b/src/lib/libcrypto/arch/arm/armcap.c
deleted file mode 100644
index 0238195397..0000000000
--- a/src/lib/libcrypto/arch/arm/armcap.c
+++ /dev/null
@@ -1,88 +0,0 @@
-/* $OpenBSD: armcap.c,v 1.3 2024/08/29 03:30:05 deraadt Exp $ */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <setjmp.h>
-#include <signal.h>
-#include <openssl/crypto.h>
-
-#include "arm_arch.h"
-
-unsigned int OPENSSL_armcap_P;
-
-#if __ARM_ARCH__ >= 7
-static sigset_t all_masked;
-
-static sigjmp_buf ill_jmp;
-
-static void
-ill_handler(int sig)
-{
-        siglongjmp(ill_jmp, sig);
-}
-
-/*
- * Following subroutines could have been inlined, but it's not all
- * ARM compilers support inline assembler...
- */
-void _armv7_neon_probe(void);
-void _armv8_aes_probe(void);
-void _armv8_sha1_probe(void);
-void _armv8_sha256_probe(void);
-void _armv8_pmull_probe(void);
-#endif
-
-void
-OPENSSL_cpuid_setup(void)
-{
-#if __ARM_ARCH__ >= 7
-        struct sigaction        ill_oact, ill_act;
-        sigset_t                oset;
-#endif
-        static int trigger = 0;
-
-        if (trigger)
-                return;
-        trigger = 1;
-
-        OPENSSL_armcap_P = 0;
-
-#if __ARM_ARCH__ >= 7
-        sigfillset(&all_masked);
-        sigdelset(&all_masked, SIGILL);
-        sigdelset(&all_masked, SIGTRAP);
-        sigdelset(&all_masked, SIGFPE);
-        sigdelset(&all_masked, SIGBUS);
-        sigdelset(&all_masked, SIGSEGV);
-
-        memset(&ill_act, 0, sizeof(ill_act));
-        ill_act.sa_handler = ill_handler;
-        ill_act.sa_mask = all_masked;
-
-        sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
-        sigaction(SIGILL, &ill_act, &ill_oact);
-
-        if (sigsetjmp(ill_jmp, 1) == 0) {
-                _armv7_neon_probe();
-                OPENSSL_armcap_P |= ARMV7_NEON;
-                if (sigsetjmp(ill_jmp, 1) == 0) {
-                        _armv8_pmull_probe();
-                        OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
-                } else if (sigsetjmp(ill_jmp, 1) == 0) {
-                        _armv8_aes_probe();
-                        OPENSSL_armcap_P |= ARMV8_AES;
-                }
-                if (sigsetjmp(ill_jmp, 1) == 0) {
-                        _armv8_sha1_probe();
-                        OPENSSL_armcap_P |= ARMV8_SHA1;
-                }
-                if (sigsetjmp(ill_jmp, 1) == 0) {
-                        _armv8_sha256_probe();
-                        OPENSSL_armcap_P |= ARMV8_SHA256;
-                }
-        }
-
-        sigaction (SIGILL, &ill_oact, NULL);
-        sigprocmask(SIG_SETMASK, &oset, NULL);
-#endif
-}