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xtensa: fix _Unwind_GetCFA

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Returning context->cfa in _Unwind_GetCFA makes CFA point one stack frame
higher than what was actually used by code at context->ra. This results
in invalid CFA value in signal frames and premature unwinding completion
in forced unwinding used by uClibc NPTL thread cancellation.
Returning context->sp from _Unwind_GetCFA makes all CFA values valid and
matching code that used them.

2015-08-18  Max Filippov  <jcmvbkbc@gmail.com>
libgcc/
	* config/xtensa/unwind-dw2-xtensa.c (_Unwind_GetCFA): Return
	context->sp instead of context->cfa.

From-SVN: r226964
This commit is contained in:
Max Filippov 2015-08-18 01:08:22 +00:00 • committed by Max Filippov
parent 0e19db59e2
commit 991995c4e7
2 changed files with 6 additions and 1 deletions
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5
libgcc/ChangeLog
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@ -1,3 +1,8 @@
2015-08-18 Max Filippov <jcmvbkbc@gmail.com>
* config/xtensa/unwind-dw2-xtensa.c (_Unwind_GetCFA): Return
context->sp instead of context->cfa.
2015-08-18 Max Filippov <jcmvbkbc@gmail.com>
* config/xtensa/t-windowed (LIB2ADDEH): Replace unwind-dw2-fde

2
libgcc/config/xtensa/unwind-dw2-xtensa.c
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@ -130,7 +130,7 @@ _Unwind_GetGR (struct _Unwind_Context *context, int index)
_Unwind_Word
_Unwind_GetCFA (struct _Unwind_Context *context)
{
return (_Unwind_Ptr) context->cfa;
return (_Unwind_Ptr) context->sp;
}
/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */