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Index: lib/libc/aarch64/Symbol.map
===================================================================
--- lib/libc/aarch64/Symbol.map
+++ lib/libc/aarch64/Symbol.map
@@ -11,6 +11,7 @@
/* PSEUDO syscalls */
_exit;
+ .mcount;
_setjmp;
_longjmp;
fabs;
Index: sys/arm64/include/profile.h
===================================================================
--- sys/arm64/include/profile.h
+++ sys/arm64/include/profile.h
@@ -44,8 +44,29 @@
typedef __uintfptr_t uintfptr_t;
-#define _MCOUNT_DECL void mcount
+#define _MCOUNT_DECL \
+static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
+static void _mcount
+
+#ifdef __GNUCLIKE_ASM
+#define MCOUNT __asm( \
+" .text \n" \
+" .align 6 \n" \
+" .type .mcount,#function \n" \
+" .globl .mcount \n" \
+" .mcount: \n" \
+" .cfi_startproc \n" \
+ /* Load the caller return address as frompc */ \
+" ldr x0, [x29, #8] \n" \
+ /* Use our return address as selfpc */ \
+" mov x1, lr \n" \
+" b _mcount \n" \
+" .cfi_endproc \n" \
+" .size .mcount, . - .mcount \n" \
+ );
+#else
#define MCOUNT
+#endif
#endif /* !_KERNEL */

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