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diff src/cpu/x86/vm/macroAssembler_x86.cpp @ 23050:e8260b6328fb

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8068945: Use RBP register as proper frame pointer in JIT compiled code on x86 Summary: Introduce the PreserveFramePointer flag to control if RBP is used as the frame pointer or as a general purpose register. Reviewed-by: kvn, roland, dlong, enevill, shade
author zmajo
date Fri, 29 May 2015 10:58:45 +0200
parents 5f8824f56f39
children dd9cc155639c faef2a237329 51c505229e71
line wrap: on
line diff
--- a/src/cpu/x86/vm/macroAssembler_x86.cpp	Fri Mar 27 10:57:42 2015 +0100
+++ b/src/cpu/x86/vm/macroAssembler_x86.cpp	Fri May 29 10:58:45 2015 +0200
@@ -6122,6 +6122,10 @@
     // We always push rbp, so that on return to interpreter rbp, will be
     // restored correctly and we can correct the stack.
     push(rbp);
+    // Save caller's stack pointer into RBP if the frame pointer is preserved.
+    if (PreserveFramePointer) {
+      mov(rbp, rsp);
+    }
     // Remove word for ebp
     framesize -= wordSize;
 
@@ -6136,6 +6140,11 @@
     // Save RBP register now.
     framesize -= wordSize;
     movptr(Address(rsp, framesize), rbp);
+    // Save caller's stack pointer into RBP if the frame pointer is preserved.
+    if (PreserveFramePointer) {
+      movptr(rbp, rsp);
+      addptr(rbp, framesize + wordSize);
+    }
   }
 
   if (VerifyStackAtCalls) { // Majik cookie to verify stack depth