runtime: use register ABI in panicIndex/Slice functions

runtime.panicIndex*/panicSlice* functions move the arguments in
the right place then tail calls goPanicIndex*/Slice* using
internal ABI. (It uses internal ABI to avoid wrappers, because
the callee needs to get the caller's PC, to know whether it panics
in the runtime.) This CL makes it to use the register ABI if it
is enabled.

Change-Id: Id2ebb51b4bfb3e9aa7cb66d0a9aee63fccee5ecd
Reviewed-on: https://go-review.googlesource.com/c/go/+/308649
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>

diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s
index cc31e5c657619773946e4382c754dcaad016dde4..77f4939b30fbeebc32652ddaf489003b2ddad4da 100644 (file)
--- a/src/runtime/asm_amd64.s
+++ b/src/runtime/asm_amd64.s
@@ -1874,68 +1874,138 @@ TEXT runtime·debugCallPanicked(SB),NOSPLIT,$16-16
 // The tail call makes these stubs disappear in backtraces.
 // Defined as ABIInternal since they do not use the stack-based Go ABI.
 TEXT runtime·panicIndex<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, BX
+#else
        MOVQ    AX, x+0(FP)
        MOVQ    CX, y+8(FP)
+#endif
        JMP     runtime·goPanicIndex<ABIInternal>(SB)
 TEXT runtime·panicIndexU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, BX
+#else
        MOVQ    AX, x+0(FP)
        MOVQ    CX, y+8(FP)
+#endif
        JMP     runtime·goPanicIndexU<ABIInternal>(SB)
 TEXT runtime·panicSliceAlen<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, AX
+       MOVQ    DX, BX
+#else
        MOVQ    CX, x+0(FP)
        MOVQ    DX, y+8(FP)
+#endif
        JMP     runtime·goPanicSliceAlen<ABIInternal>(SB)
 TEXT runtime·panicSliceAlenU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, AX
+       MOVQ    DX, BX
+#else
        MOVQ    CX, x+0(FP)
        MOVQ    DX, y+8(FP)
+#endif
        JMP     runtime·goPanicSliceAlenU<ABIInternal>(SB)
 TEXT runtime·panicSliceAcap<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, AX
+       MOVQ    DX, BX
+#else
        MOVQ    CX, x+0(FP)
        MOVQ    DX, y+8(FP)
+#endif
        JMP     runtime·goPanicSliceAcap<ABIInternal>(SB)
 TEXT runtime·panicSliceAcapU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, AX
+       MOVQ    DX, BX
+#else
        MOVQ    CX, x+0(FP)
        MOVQ    DX, y+8(FP)
+#endif
        JMP     runtime·goPanicSliceAcapU<ABIInternal>(SB)
 TEXT runtime·panicSliceB<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, BX
+#else
        MOVQ    AX, x+0(FP)
        MOVQ    CX, y+8(FP)
+#endif
        JMP     runtime·goPanicSliceB<ABIInternal>(SB)
 TEXT runtime·panicSliceBU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, BX
+#else
        MOVQ    AX, x+0(FP)
        MOVQ    CX, y+8(FP)
+#endif
        JMP     runtime·goPanicSliceBU<ABIInternal>(SB)
 TEXT runtime·panicSlice3Alen<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    DX, AX
+#else
        MOVQ    DX, x+0(FP)
        MOVQ    BX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3Alen<ABIInternal>(SB)
 TEXT runtime·panicSlice3AlenU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    DX, AX
+#else
        MOVQ    DX, x+0(FP)
        MOVQ    BX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3AlenU<ABIInternal>(SB)
 TEXT runtime·panicSlice3Acap<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    DX, AX
+#else
        MOVQ    DX, x+0(FP)
        MOVQ    BX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3Acap<ABIInternal>(SB)
 TEXT runtime·panicSlice3AcapU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    DX, AX
+#else
        MOVQ    DX, x+0(FP)
        MOVQ    BX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3AcapU<ABIInternal>(SB)
 TEXT runtime·panicSlice3B<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, AX
+       MOVQ    DX, BX
+#else
        MOVQ    CX, x+0(FP)
        MOVQ    DX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3B<ABIInternal>(SB)
 TEXT runtime·panicSlice3BU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, AX
+       MOVQ    DX, BX
+#else
        MOVQ    CX, x+0(FP)
        MOVQ    DX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3BU<ABIInternal>(SB)
 TEXT runtime·panicSlice3C<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, BX
+#else
        MOVQ    AX, x+0(FP)
        MOVQ    CX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3C<ABIInternal>(SB)
 TEXT runtime·panicSlice3CU<ABIInternal>(SB),NOSPLIT,$0-16
+#ifdef GOEXPERIMENT_regabiargs
+       MOVQ    CX, BX
+#else
        MOVQ    AX, x+0(FP)
        MOVQ    CX, y+8(FP)
+#endif
        JMP     runtime·goPanicSlice3CU<ABIInternal>(SB)
 
 #ifdef GOOS_android