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Logan Chien 7fab97f364 libunwind: Fix unw_step() for ARM EHABI. 
This commit fixes the unw_step() for ARM EHABI.  However, this commit
also changes the implementation details for ARM EHABI.

The first change is that the personality function should call
__gnu_unwind_frame() for default (or de facto) frame unwinding based on
the ARM-defined unwind opcode.  The function __gnu_unwind_frame() will
in turn calls unw_step() which actually unwinds the frame.

The second change is that the implementation _Unwind_Backtrace() should
no longer calls unw_step() to unwind the frame; since according to ARM
EHABI, the personality function should unwind the frame for us.

Special thanks to Anton for helpful suggestion on the initial version of
this patch.

llvm-svn: 238560
 		2015-05-29 15:33:38 +00:00
..
libunwind_01.pass.cpp libunwind: Fix unw_step() for ARM EHABI. 2015-05-29 15:33:38 +00:00
libunwind_02.pass.cpp libunwind: Fix unw_step() for ARM EHABI. 2015-05-29 15:33:38 +00:00