This port has some infrastructure to use an optimized function that uses a function pointer. Not sure why for arm64 it actually uses that infrastructure, since the only alternative is the generic C implementation. But adding a BTI instruction is the easiest fix.
ok? Index: audio/mpg123/Makefile =================================================================== RCS file: /cvs/ports/audio/mpg123/Makefile,v retrieving revision 1.116 diff -u -p -r1.116 Makefile --- audio/mpg123/Makefile 30 Mar 2023 12:35:39 -0000 1.116 +++ audio/mpg123/Makefile 24 Jul 2023 19:23:10 -0000 @@ -1,6 +1,7 @@ COMMENT= fast console MPEG audio player and decoder library DISTNAME= mpg123-1.31.3 +REVISION= 0 SHARED_LIBS= mpg123 7.2 # 47.0 SHARED_LIBS+= out123 2.1 # 4.7 SHARED_LIBS+= syn123 0.1 # 1.5 Index: audio/mpg123/patches/patch-src_libmpg123_dct36_neon64_S =================================================================== RCS file: audio/mpg123/patches/patch-src_libmpg123_dct36_neon64_S diff -N audio/mpg123/patches/patch-src_libmpg123_dct36_neon64_S --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ audio/mpg123/patches/patch-src_libmpg123_dct36_neon64_S 24 Jul 2023 19:23:10 -0000 @@ -0,0 +1,11 @@ +Index: src/libmpg123/dct36_neon64.S +--- src/libmpg123/dct36_neon64.S.orig ++++ src/libmpg123/dct36_neon64.S +@@ -49,6 +49,7 @@ dct36_aarch64_COS9: + .type ASM_NAME(dct36_neon64), %function + #endif + ASM_NAME(dct36_neon64): ++ bti c + adrp x5, AARCH64_PCREL_HI(dct36_aarch64_COS9) + add x5, x5, AARCH64_PCREL_LO(dct36_aarch64_COS9) + cmeq v28.16b, v28.16b, v28.16b
