/*
- * Copyright 2011-2022 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2011-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <setjmp.h>
-#include <signal.h>
#include <openssl/crypto.h>
#ifdef __APPLE__
#include <sys/sysctl.h>
+#else
+#include <setjmp.h>
+#include <signal.h>
#endif
#include "internal/cryptlib.h"
-#ifndef _WIN32
-#include <unistd.h>
-#else
+#ifdef _WIN32
#include <windows.h>
+#else
+#include <unistd.h>
#endif
#include "arm_arch.h"
{
return 0;
}
-#elif __ARM_MAX_ARCH__<7
+#elif __ARM_MAX_ARCH__ < 7
void OPENSSL_cpuid_setup(void)
{
}
{
return 0;
}
-#else
-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);
-# ifdef __aarch64__
-void _armv8_sm3_probe(void);
-void _armv8_sm4_probe(void);
-void _armv8_eor3_probe(void);
-void _armv8_sha512_probe(void);
-unsigned int _armv8_cpuid_probe(void);
-void _armv8_sve_probe(void);
-void _armv8_sve2_probe(void);
-void _armv8_rng_probe(void);
-
-size_t OPENSSL_rndr_asm(unsigned char *buf, size_t len);
-size_t OPENSSL_rndrrs_asm(unsigned char *buf, size_t len);
-
-size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len);
-size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
-
-static size_t OPENSSL_rndr_wrapper(size_t (*func)(unsigned char *, size_t), unsigned char *buf, size_t len)
-{
- size_t buffer_size = 0;
- int i;
-
- for (i = 0; i < 8; i++) {
- buffer_size = func(buf, len);
- if (buffer_size == len)
- break;
- usleep(5000); /* 5000 microseconds (5 milliseconds) */
- }
- return buffer_size;
-}
+#else /* !_WIN32 && __ARM_MAX_ARCH__ >= 7 */
-size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len)
-{
- return OPENSSL_rndr_wrapper(OPENSSL_rndr_asm, buf, len);
-}
+ /* 3 ways of handling things here: __APPLE__, getauxval() or SIGILL detect */
-size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len)
-{
- return OPENSSL_rndr_wrapper(OPENSSL_rndrrs_asm, buf, len);
-}
-# endif
-uint32_t _armv7_tick(void);
-
-uint32_t OPENSSL_rdtsc(void)
-{
- if (OPENSSL_armcap_P & ARMV7_TICK)
- return _armv7_tick();
- else
- return 0;
-}
+ /* First determine if getauxval() is available (OSSL_IMPLEMENT_GETAUXVAL) */
# if defined(__GNUC__) && __GNUC__>=2
void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
* Android: according to https://developer.android.com/ndk/guides/cpu-features,
* getauxval is supported starting with API level 18
*/
-# if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
-# include <sys/auxv.h>
-# define OSSL_IMPLEMENT_GETAUXVAL
-# endif
+# if defined(__ANDROID__) && defined(__ANDROID_API__) && __ANDROID_API__ >= 18
+# include <sys/auxv.h>
+# define OSSL_IMPLEMENT_GETAUXVAL
+# endif
/*
* ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
# define AT_HWCAP2 26
# endif
# if defined(__arm__) || defined (__arm)
-# define HWCAP AT_HWCAP
-# define HWCAP_NEON (1 << 12)
-
-# 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)
+# define OSSL_HWCAP AT_HWCAP
+# define OSSL_HWCAP_NEON (1 << 12)
+
+# define OSSL_HWCAP_CE AT_HWCAP2
+# define OSSL_HWCAP_CE_AES (1 << 0)
+# define OSSL_HWCAP_CE_PMULL (1 << 1)
+# define OSSL_HWCAP_CE_SHA1 (1 << 2)
+# define OSSL_HWCAP_CE_SHA256 (1 << 3)
# elif defined(__aarch64__)
-# define HWCAP AT_HWCAP
-# define HWCAP_NEON (1 << 1)
-
-# define HWCAP_CE HWCAP
-# define HWCAP_CE_AES (1 << 3)
-# define HWCAP_CE_PMULL (1 << 4)
-# define HWCAP_CE_SHA1 (1 << 5)
-# define HWCAP_CE_SHA256 (1 << 6)
-# define HWCAP_CPUID (1 << 11)
-# define HWCAP_SHA3 (1 << 17)
-# define HWCAP_CE_SM3 (1 << 18)
-# define HWCAP_CE_SM4 (1 << 19)
-# define HWCAP_CE_SHA512 (1 << 21)
-# define HWCAP_SVE (1 << 22)
- /* AT_HWCAP2 */
-# define HWCAP2 26
-# define HWCAP2_SVE2 (1 << 1)
-# define HWCAP2_RNG (1 << 16)
+# define OSSL_HWCAP AT_HWCAP
+# define OSSL_HWCAP_NEON (1 << 1)
+
+# define OSSL_HWCAP_CE AT_HWCAP
+# define OSSL_HWCAP_CE_AES (1 << 3)
+# define OSSL_HWCAP_CE_PMULL (1 << 4)
+# define OSSL_HWCAP_CE_SHA1 (1 << 5)
+# define OSSL_HWCAP_CE_SHA256 (1 << 6)
+# define OSSL_HWCAP_CPUID (1 << 11)
+# define OSSL_HWCAP_SHA3 (1 << 17)
+# define OSSL_HWCAP_CE_SM3 (1 << 18)
+# define OSSL_HWCAP_CE_SM4 (1 << 19)
+# define OSSL_HWCAP_CE_SHA512 (1 << 21)
+# define OSSL_HWCAP_SVE (1 << 22)
+ /* AT_HWCAP2 */
+# define OSSL_HWCAP2 26
+# define OSSL_HWCAP2_SVE2 (1 << 1)
+# define OSSL_HWCAP2_RNG (1 << 16)
+# endif
+
+uint32_t _armv7_tick(void);
+
+uint32_t OPENSSL_rdtsc(void)
+{
+ if (OPENSSL_armcap_P & ARMV7_TICK)
+ return _armv7_tick();
+ else
+ return 0;
+}
+
+# ifdef __aarch64__
+size_t OPENSSL_rndr_asm(unsigned char *buf, size_t len);
+size_t OPENSSL_rndrrs_asm(unsigned char *buf, size_t len);
+
+size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len);
+size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
+
+static size_t OPENSSL_rndr_wrapper(size_t (*func)(unsigned char *, size_t), unsigned char *buf, size_t len)
+{
+ size_t buffer_size = 0;
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ buffer_size = func(buf, len);
+ if (buffer_size == len)
+ break;
+ usleep(5000); /* 5000 microseconds (5 milliseconds) */
+ }
+ return buffer_size;
+}
+
+size_t OPENSSL_rndr_bytes(unsigned char *buf, size_t len)
+{
+ return OPENSSL_rndr_wrapper(OPENSSL_rndr_asm, buf, len);
+}
+
+size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len)
+{
+ return OPENSSL_rndr_wrapper(OPENSSL_rndrrs_asm, buf, len);
+}
+# endif
+
+# if !defined(__APPLE__) && !defined(OSSL_IMPLEMENT_GETAUXVAL)
+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 not all
+ * ARM compilers support inline assembler, and we'd then have to
+ * worry about the compiler optimising out the detection code...
+ */
+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);
+# ifdef __aarch64__
+void _armv8_sm3_probe(void);
+void _armv8_sm4_probe(void);
+void _armv8_sha512_probe(void);
+void _armv8_eor3_probe(void);
+void _armv8_sve_probe(void);
+void _armv8_sve2_probe(void);
+void _armv8_rng_probe(void);
+# endif
+# endif /* !__APPLE__ && !OSSL_IMPLEMENT_GETAUXVAL */
+
+/* We only call _armv8_cpuid_probe() if (OPENSSL_armcap_P & ARMV8_CPUID) != 0 */
+unsigned int _armv8_cpuid_probe(void);
+
+# if defined(__APPLE__)
+/*
+ * Checks the specified integer sysctl, returning `value` if it's 1, otherwise returning 0.
+ */
+static unsigned int sysctl_query(const char *name, unsigned int value)
+{
+ unsigned int sys_value = 0;
+ size_t len = sizeof(sys_value);
+
+ return (sysctlbyname(name, &sys_value, &len, NULL, 0) == 0 && sys_value == 1) ? value : 0;
+}
+# elif !defined(OSSL_IMPLEMENT_GETAUXVAL)
+/*
+ * Calls a provided probe function, which may SIGILL. If it doesn't, return `value`, otherwise return 0.
+ */
+static unsigned int arm_probe_for(void (*probe)(void), volatile unsigned int value)
+{
+ if (sigsetjmp(ill_jmp, 1) == 0) {
+ probe();
+ return value;
+ } else {
+ /* The probe function gave us SIGILL */
+ return 0;
+ }
+}
# endif
void OPENSSL_cpuid_setup(void)
{
const char *e;
+# if !defined(__APPLE__) && !defined(OSSL_IMPLEMENT_GETAUXVAL)
struct sigaction ill_oact, ill_act;
sigset_t oset;
+# endif
static int trigger = 0;
if (trigger)
}
# if defined(__APPLE__)
-# if !defined(__aarch64__)
+# if !defined(__aarch64__)
/*
* Capability probing by catching SIGILL appears to be problematic
* on iOS. But since Apple universe is "monocultural", it's actually
OPENSSL_armcap_P = ARMV7_NEON;
return;
}
- /*
- * One could do same even for __aarch64__ iOS builds. It's not done
- * exclusively for reasons of keeping code unified across platforms.
- * Unified code works because it never triggers SIGILL on Apple
- * devices...
- */
-# else
+# else
{
- unsigned int feature;
- size_t len = sizeof(feature);
- char uarch[64];
-
- if (sysctlbyname("hw.optional.armv8_2_sha512", &feature, &len, NULL, 0) == 0 && feature == 1)
- OPENSSL_armcap_P |= ARMV8_SHA512;
- feature = 0;
- if (sysctlbyname("hw.optional.armv8_2_sha3", &feature, &len, NULL, 0) == 0 && feature == 1) {
- OPENSSL_armcap_P |= ARMV8_SHA3;
- len = sizeof(uarch);
+ /*
+ * From
+ * https://github.com/llvm/llvm-project/blob/412237dcd07e5a2afbb1767858262a5f037149a3/llvm/lib/Target/AArch64/AArch64.td#L719
+ * all of these have been available on 64-bit Apple Silicon from the
+ * beginning (the A7).
+ */
+ OPENSSL_armcap_P |= ARMV7_NEON | ARMV8_PMULL | ARMV8_AES | ARMV8_SHA1 | ARMV8_SHA256;
+
+ /* More recent extensions are indicated by sysctls */
+ OPENSSL_armcap_P |= sysctl_query("hw.optional.armv8_2_sha512", ARMV8_SHA512);
+ OPENSSL_armcap_P |= sysctl_query("hw.optional.armv8_2_sha3", ARMV8_SHA3);
+
+ if (OPENSSL_armcap_P & ARMV8_SHA3) {
+ char uarch[64];
+
+ size_t len = sizeof(uarch);
if ((sysctlbyname("machdep.cpu.brand_string", uarch, &len, NULL, 0) == 0) &&
((strncmp(uarch, "Apple M1", 8) == 0) ||
- (strncmp(uarch, "Apple M2", 8) == 0)))
+ (strncmp(uarch, "Apple M2", 8) == 0))) {
OPENSSL_armcap_P |= ARMV8_UNROLL8_EOR3;
+ }
}
}
-# endif
-# endif
+# endif /* __aarch64__ */
+
+# elif defined(OSSL_IMPLEMENT_GETAUXVAL)
-# ifdef OSSL_IMPLEMENT_GETAUXVAL
- if (getauxval(HWCAP) & HWCAP_NEON) {
- unsigned long hwcap = getauxval(HWCAP_CE);
+ if (getauxval(OSSL_HWCAP) & OSSL_HWCAP_NEON) {
+ unsigned long hwcap = getauxval(OSSL_HWCAP_CE);
OPENSSL_armcap_P |= ARMV7_NEON;
- if (hwcap & HWCAP_CE_AES)
+ if (hwcap & OSSL_HWCAP_CE_AES)
OPENSSL_armcap_P |= ARMV8_AES;
- if (hwcap & HWCAP_CE_PMULL)
+ if (hwcap & OSSL_HWCAP_CE_PMULL)
OPENSSL_armcap_P |= ARMV8_PMULL;
- if (hwcap & HWCAP_CE_SHA1)
+ if (hwcap & OSSL_HWCAP_CE_SHA1)
OPENSSL_armcap_P |= ARMV8_SHA1;
- if (hwcap & HWCAP_CE_SHA256)
+ if (hwcap & OSSL_HWCAP_CE_SHA256)
OPENSSL_armcap_P |= ARMV8_SHA256;
# ifdef __aarch64__
- if (hwcap & HWCAP_CE_SM4)
+ if (hwcap & OSSL_HWCAP_CE_SM4)
OPENSSL_armcap_P |= ARMV8_SM4;
- if (hwcap & HWCAP_CE_SHA512)
+ if (hwcap & OSSL_HWCAP_CE_SHA512)
OPENSSL_armcap_P |= ARMV8_SHA512;
- if (hwcap & HWCAP_CPUID)
+ if (hwcap & OSSL_HWCAP_CPUID)
OPENSSL_armcap_P |= ARMV8_CPUID;
- if (hwcap & HWCAP_CE_SM3)
+ if (hwcap & OSSL_HWCAP_CE_SM3)
OPENSSL_armcap_P |= ARMV8_SM3;
- if (hwcap & HWCAP_SHA3)
+ if (hwcap & OSSL_HWCAP_SHA3)
OPENSSL_armcap_P |= ARMV8_SHA3;
# endif
}
# ifdef __aarch64__
- if (getauxval(HWCAP) & HWCAP_SVE)
+ if (getauxval(OSSL_HWCAP) & OSSL_HWCAP_SVE)
OPENSSL_armcap_P |= ARMV8_SVE;
- if (getauxval(HWCAP2) & HWCAP2_SVE2)
+ if (getauxval(OSSL_HWCAP2) & OSSL_HWCAP2_SVE2)
OPENSSL_armcap_P |= ARMV8_SVE2;
- if (getauxval(HWCAP2) & HWCAP2_RNG)
+ if (getauxval(OSSL_HWCAP2) & OSSL_HWCAP2_RNG)
OPENSSL_armcap_P |= ARMV8_RNG;
# endif
-# endif
+
+# else /* !__APPLE__ && !OSSL_IMPLEMENT_GETAUXVAL */
+
+ /* If all else fails, do brute force SIGILL-based feature detection */
sigfillset(&all_masked);
sigdelset(&all_masked, SIGILL);
sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
sigaction(SIGILL, &ill_act, &ill_oact);
- /* If we used getauxval, we already have all the values */
-# ifndef OSSL_IMPLEMENT_GETAUXVAL
- 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;
- }
-# if defined(__aarch64__) && !defined(__APPLE__)
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_sm4_probe();
- OPENSSL_armcap_P |= ARMV8_SM4;
- }
+ OPENSSL_armcap_P |= arm_probe_for(_armv7_neon_probe, ARMV7_NEON);
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_sha512_probe();
- OPENSSL_armcap_P |= ARMV8_SHA512;
- }
+ if (OPENSSL_armcap_P & ARMV7_NEON) {
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_sm3_probe();
- OPENSSL_armcap_P |= ARMV8_SM3;
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_pmull_probe, ARMV8_PMULL | ARMV8_AES);
+ if (!(OPENSSL_armcap_P & ARMV8_AES)) {
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_aes_probe, ARMV8_AES);
}
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_eor3_probe();
- OPENSSL_armcap_P |= ARMV8_SHA3;
- }
-# endif
- }
-# ifdef __aarch64__
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_sve_probe();
- OPENSSL_armcap_P |= ARMV8_SVE;
- }
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_sve2_probe();
- OPENSSL_armcap_P |= ARMV8_SVE2;
- }
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sha1_probe, ARMV8_SHA1);
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sha256_probe, ARMV8_SHA256);
- if (sigsetjmp(ill_jmp, 1) == 0) {
- _armv8_rng_probe();
- OPENSSL_armcap_P |= ARMV8_RNG;
+# if defined(__aarch64__)
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sm3_probe, ARMV8_SM3);
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sm4_probe, ARMV8_SM4);
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sha512_probe, ARMV8_SHA512);
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_eor3_probe, ARMV8_SHA3);
+# endif
}
+# ifdef __aarch64__
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sve_probe, ARMV8_SVE);
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_sve2_probe, ARMV8_SVE2);
+ OPENSSL_armcap_P |= arm_probe_for(_armv8_rng_probe, ARMV8_RNG);
# endif
-# endif
/*
* Probing for ARMV7_TICK is known to produce unreliable results,
- * so we will only use the feature when the user explicitly enables
- * it with OPENSSL_armcap.
+ * so we only use the feature when the user explicitly enables it
+ * with OPENSSL_armcap.
*/
sigaction(SIGILL, &ill_oact, NULL);
sigprocmask(SIG_SETMASK, &oset, NULL);
+# endif /* __APPLE__, OSSL_IMPLEMENT_GETAUXVAL */
+
# ifdef __aarch64__
if (OPENSSL_armcap_P & ARMV8_CPUID)
OPENSSL_arm_midr = _armv8_cpuid_probe();
OPENSSL_armcap_P |= ARMV8_UNROLL8_EOR3;
# endif
}
-#endif
+#endif /* _WIN32, __ARM_MAX_ARCH__ >= 7 */
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