runtime: define racefuncenter and racefuncexit as ABIInternal

They are called from compiler instrumented code as ABIInternal.
Define them as ABIInternal to avoid the wrappers and save some
stack space, to avoid nosplit overflow in -race -N -l build.

For #51247.

Change-Id: Iadad7d6da8ac03780a7b02b03b004c52d34e020a
Reviewed-on: https://go-review.googlesource.com/c/go/+/386715
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

diff --git a/src/runtime/race_arm64.s b/src/runtime/race_arm64.s
index 798e23294a0237663aec88a4da08e4c4d2bb2a25..59fade02eeeb451e1169a4caa106e6b84cf790e6 100644 (file)
--- a/src/runtime/race_arm64.s
+++ b/src/runtime/race_arm64.s
@@ -188,8 +188,12 @@ ret:
 
 // func runtime·racefuncenter(pc uintptr)
 // Called from instrumented code.
-TEXT   runtime·racefuncenter(SB), NOSPLIT, $0-8
+TEXT   runtime·racefuncenter<ABIInternal>(SB), NOSPLIT, $0-8
+#ifdef GOEXPERIMENT_regabiargs
+       MOVD    R0, R9  // callpc
+#else
        MOVD    callpc+0(FP), R9
+#endif
        JMP     racefuncenter<>(SB)
 
 // Common code for racefuncenter
@@ -205,7 +209,7 @@ TEXT        racefuncenter<>(SB), NOSPLIT, $0-0
 
 // func runtime·racefuncexit()
 // Called from instrumented code.
-TEXT   runtime·racefuncexit(SB), NOSPLIT, $0-0
+TEXT   runtime·racefuncexit<ABIInternal>(SB), NOSPLIT, $0-0
        load_g
        MOVD    g_racectx(g), R0        // race context
        // void __tsan_func_exit(ThreadState *thr);