Add elf_aux_info() support on FreeBSD/OpenBSD for PMULL and EOR3

Use elf_aux_info() to detect PMULL and EOR3 on FreeBSD and OpenBSD
aarch64.

diff --git a/arch/arm/arm_features.c b/arch/arm/arm_features.c
index 6572fe7032a036592aa0131f1fd8ab58cd299019..98dececc45916629789302a11d5d8e452dbe460a 100644 (file)
--- a/arch/arm/arm_features.c
+++ b/arch/arm/arm_features.c
@@ -86,6 +86,17 @@ static int arm_has_pmull(void) {
     if (sysctl(isar0_mib, 2, &isar0, &len, NULL, 0) != -1) {
       has_pmull = ID_AA64ISAR0_AES(isar0) >= ID_AA64ISAR0_AES_BASE;
     }
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+#  ifdef HWCAP_PMULL
+    unsigned long hwcap = 0;
+    elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
+    has_pmull = (hwcap & HWCAP_PMULL) != 0;
+#  elif defined(HWCAP_AES)
+    /* PMULL is part of crypto extension, check for AES as proxy */
+    unsigned long hwcap = 0;
+    elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
+    has_pmull = (hwcap & HWCAP_AES) != 0;
+#  endif
 #elif defined(__APPLE__)
     int has_feat = 0;
     size_t size = sizeof(has_feat);
@@ -127,6 +138,16 @@ static int arm_has_eor3(void) {
       has_eor3 = ID_AA64ISAR0_SHA3(isar0) >= ID_AA64ISAR0_SHA3_IMPL;
     }
 #  endif
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
+#  ifdef HWCAP2_SHA3
+    unsigned long hwcap2 = 0;
+    elf_aux_info(AT_HWCAP2, &hwcap2, sizeof(hwcap2));
+    has_eor3 = (hwcap2 & HWCAP2_SHA3) != 0;
+#  elif defined(HWCAP_SHA3)
+    unsigned long hwcap = 0;
+    elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
+    has_eor3 = (hwcap & HWCAP_SHA3) != 0;
+#  endif
 #elif defined(__APPLE__)
     /* All Apple Silicon (M1+) has SHA3/EOR3 support */
     int has_feat = 0;