aarch64: Implement support for elf_aux_info(3) on FreeBSD and OpenBSD
FreeBSD 12.0+, OpenBSD -current and what will be OpenBSD 7.6 support
elf_aux_info(3).
Signed-off-by: Brad Smith <b...@comstyle.com>
---
configure | 2 ++
libavutil/aarch64/cpu.c | 23 ++++++++++++++++++++++-
2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index f6f5c29fea..e80b549582 100755
--- a/configure
+++ b/configure
@@ -2366,6 +2366,7 @@ SYSTEM_FUNCS="
clock_gettime
closesocket
CommandLineToArgvW
+ elf_aux_info
fcntl
getaddrinfo
getauxval
@@ -6565,6 +6566,7 @@ check_func_headers mach/mach_time.h mach_absolute_time
check_func_headers stdlib.h getenv
check_func_headers sys/stat.h lstat
check_func_headers sys/auxv.h getauxval
+check_func_headers sys/auxv.h elf_aux_info
check_func_headers sys/sysctl.h sysctlbyname
check_func_headers windows.h GetModuleHandle
diff --git a/libavutil/aarch64/cpu.c b/libavutil/aarch64/cpu.c
index cfa9306663..05272b4db4 100644
--- a/libavutil/aarch64/cpu.c
+++ b/libavutil/aarch64/cpu.c
@@ -42,6 +42,27 @@ static int detect_flags(void)
return flags;
}
+#elif (defined(__FreeBSD__) || defined(__OpenBSD__)) && HAVE_ELF_AUX_INFO
+#include <stdint.h>
+#include <sys/auxv.h>
+
+static int detect_flags(void)
+{
+ int flags = 0;
+
+ unsigned long hwcap = 0;
+ elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
+ unsigned long hwcap2 = 0;
+ elf_aux_info(AT_HWCAP2, &hwcap2, sizeof hwcap2);
+
+ if (hwcap & HWCAP_ASIMDDP)
+ flags |= AV_CPU_FLAG_DOTPROD;
+ if (hwcap2 & HWCAP2_I8MM)
+ flags |= AV_CPU_FLAG_I8MM;
+
+ return flags;
+}
+
#elif defined(__APPLE__) && HAVE_SYSCTLBYNAME
#include <sys/sysctl.h>
@@ -65,7 +86,7 @@ static int detect_flags(void)
return flags;
}
-#elif defined(__OpenBSD__)
+#elif defined(__OpenBSD__) && !HAVE_ELF_AUX_INFO
#include <machine/armreg.h>
#include <machine/cpu.h>
#include <sys/types.h>
--
2.45.2
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