Author: jmolenda
Date: Tue Aug 12 19:21:31 2014
New Revision: 215484
URL: http://llvm.org/viewvc/llvm-project?rev=215484&view=rev
Log:
Add comment explaining the dwarf v. eh_frame register numbering used
on i386 darwin.
Modified:
lldb/trunk/tools/debugserver/source/MacOSX/i386/DNBArchImplI386.cpp
Modified: lldb/trunk/tools/debugserver/source/MacOSX/i386/DNBArchImplI386.cpp
URL:
http://llvm.org/viewvc/llvm-project/lldb/trunk/tools/debugserver/source/MacOSX/i386/DNBArchImplI386.cpp?rev=215484&r1=215483&r2=215484&view=diff
==============================================================================
--- lldb/trunk/tools/debugserver/source/MacOSX/i386/DNBArchImplI386.cpp
(original)
+++ lldb/trunk/tools/debugserver/source/MacOSX/i386/DNBArchImplI386.cpp Tue Aug
12 19:21:31 2014
@@ -167,7 +167,12 @@ enum
gcc_ecx,
gcc_edx,
gcc_ebx,
- gcc_ebp,
+
+ // On i386 Darwin the eh_frame register numbers for ebp and esp are
reversed from DWARF.
+ // It's due to an ancient compiler bug in the output of the eh_frame.
+ // Specifically, on i386 darwin eh_frame, 4 is ebp, 5 is esp.
+ // On i386 darwin debug_frame (and debug_info), 4 is esp, 5 is ebp.
+ gcc_ebp,
gcc_esp,
gcc_esi,
gcc_edi,
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