aarch64: enable PAC/BTI

src/libmpg123/aarch64_defs.h

@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1
+ *
+ *	aarch64_defs.h: Support macros for the aarch64 architectural features
+ */
+
+#ifndef SRC_LIBMPG123_AARCH64_DEFS_H_
+#define SRC_LIBMPG123_AARCH64_DEFS_H_
+
+/*
+ * Guard this header so arm assembly files can just include it without the need
+ * to if-def each instance.
+ */
+#ifdef __aarch64__
+
+/*
+ * References:
+ *  - https://developer.arm.com/documentation/101028/0012/5--Feature-test-macros
+ *  - https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst
+ */
+
+#if defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
+  #define GNU_PROPERTY_AARCH64_BTI 1 /* bit 0 GNU Notes is for BTI support */
+#else
+  #define GNU_PROPERTY_AARCH64_BTI 0
+#endif
+
+#if defined(__ARM_FEATURE_PAC_DEFAULT)
+  #define GNU_PROPERTY_AARCH64_POINTER_AUTH 2 /* bit 1 GNU Notes is for PAC support */
+#else
+  #define GNU_PROPERTY_AARCH64_POINTER_AUTH 0
+#endif
+
+/* Add the BTI support to GNU Notes section */
+#if defined(__ASSEMBLER__) && defined(__ELF__)
+#if GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_POINTER_AUTH != 0
+    .pushsection .note.gnu.property, "a"; /* Start a new allocatable section */
+    .balign 8; /* align it on a byte boundry */
+    .long 4; /* size of "GNU\0" */
+    .long 0x10; /* size of descriptor */
+    .long 0x5; /* NT_GNU_PROPERTY_TYPE_0 */
+    .asciz "GNU";
+    .long 0xc0000000; /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
+    .long 4; /* Four bytes of data */
+    .long (GNU_PROPERTY_AARCH64_BTI|GNU_PROPERTY_AARCH64_POINTER_AUTH); /* BTI or PAC is enabled */
+    .long 0; /* padding for 8 byte alignment */
+    .popsection; /* end the section */
+#endif /* GNU Notes additions */
+#endif /* if __ASSEMBLER__ and __ELF__ */
+
+#endif /* __arch64__ */
+
+#endif /* SRC_LIBMPG123_AARCH64_DEFS_H_ */

src/libmpg123/check_neon.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Momma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __aarch64__

src/libmpg123/dct36_neon64.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/dct64_neon64_float.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/synth_neon64_accurate.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/synth_neon64_float.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/synth_neon64_s32.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/synth_stereo_neon64_accurate.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/synth_stereo_neon64_float.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__

src/libmpg123/synth_stereo_neon64_s32.S

@@ -6,6 +6,7 @@
 	initially written by Taihei Monma
 */
 
+#include "aarch64_defs.h"
 #include "mangle.h"
 
 #ifndef __APPLE__