[compiler-rt] [SystemZ][XRay] XRay runtime support for SystemZ (PR #113252)

[Ulrich Weigand via llvm-commits]

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@@ -0,0 +1,111 @@
+//===-- xray_trampoline_s390x.s ---------------------------------*- ASM -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of XRay, a dynamic runtime instrumentation system.
+//
+// This implements the s390x-specific assembler for the trampolines.
+//
+//===----------------------------------------------------------------------===//
+
+    .text
+
+#if __VX__
+// Minimal stack frame size (160) plus space for 8 vector registers a 16 bytes.
+#define STACKSZ  288
+#else
+// Minimal stack frame size
+#define STACKSZ  160
+#endif
+
+//===----------------------------------------------------------------------===//
+
+    .globl  __xray_FunctionEntry
+    .p2align    4
+    .type   __xray_FunctionEntry, at function
+__xray_FunctionEntry:
+    # The registers r2-15 of the instrumented function are already saved in the
+    # stack frame. On entry, r2 contains the function id, and %r14 the address
+    # of the first instruction of the instrumented function.
+    # Register r14 will be stored in the slot reserved for compiler use.
+    stg     %r14, 8(%r15)
+    std     %f0, 128(%r15)
+    std     %f2, 136(%r15)
+    std     %f4, 144(%r15)
+    std     %f6, 152(%r15)
+    aghi    %r15, -STACKSZ
+#if __VX__
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uweigand wrote:

Ah, excellent.  Sorry I missed that.   All LGTM now.

https://github.com/llvm/llvm-project/pull/113252