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Add ARM EHABI support to gcc_personality_v0. 

Until now the only exception APIs supported by gcc_personality_v0
are DWARF EH and SJLJ. This adds support for ARM EHABI as well.

This is achieved by
a) changing the function signature on ARM EHABI,
b) unwinding the stack before returning _URC_CONTINUE_UNWIND.

See "Exception Handling ABI for the ARM Architecture" for details
(http://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf).

Patch by Timon Van Overveldt.

llvm-svn: 263010
This commit is contained in:
Logan Chien 2016-03-09 13:20:17 +00:00
parent ecf1b4c24d
commit 5b7b9e946c
1 changed files with 36 additions and 5 deletions
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41
compiler-rt/lib/builtins/gcc_personality_v0.c
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@ -131,6 +131,26 @@ static uintptr_t readEncodedPointer(const uint8_t** data, uint8_t encoding)
return result;
}
#if defined(__arm__) && !defined(__USING_SJLJ_EXCEPTIONS__) && \
!defined(__ARM_DWARF_EH__)
#define USING_ARM_EHABI 1
_Unwind_Reason_Code __gnu_unwind_frame(struct _Unwind_Exception *,
struct _Unwind_Context *);
#endif
static inline _Unwind_Reason_Code
continueUnwind(struct _Unwind_Exception *exceptionObject,
struct _Unwind_Context *context) {
#if USING_ARM_EHABI
/*
* On ARM EHABI the personality routine is responsible for actually
* unwinding a single stack frame before returning (ARM EHABI Sec. 6.1).
*/
if (__gnu_unwind_frame(exceptionObject, context) != _URC_OK)
return _URC_FAILURE;
#endif
return _URC_CONTINUE_UNWIND;
}
/*
* The C compiler makes references to __gcc_personality_v0 in
@ -147,6 +167,11 @@ COMPILER_RT_ABI _Unwind_Reason_Code
__gcc_personality_sj0(int version, _Unwind_Action actions,
uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
struct _Unwind_Context *context)
#elif USING_ARM_EHABI
/* The ARM EHABI personality routine has a different signature. */
COMPILER_RT_ABI _Unwind_Reason_Code __gcc_personality_v0(
_Unwind_State state, struct _Unwind_Exception *exceptionObject,
struct _Unwind_Context *context)
#else
COMPILER_RT_ABI _Unwind_Reason_Code
__gcc_personality_v0(int version, _Unwind_Action actions,
@ -156,13 +181,19 @@ __gcc_personality_v0(int version, _Unwind_Action actions,
{
/* Since C does not have catch clauses, there is nothing to do during */
/* phase 1 (the search phase). */
if ( actions & _UA_SEARCH_PHASE )
return _URC_CONTINUE_UNWIND;
#if USING_ARM_EHABI
/* After resuming from a cleanup we should also continue on to the next
* frame straight away. */
if ((state & _US_ACTION_MASK) != _US_UNWIND_FRAME_STARTING)
#else
if ( actions & _UA_SEARCH_PHASE )
#endif
return continueUnwind(exceptionObject, context);
/* There is nothing to do if there is no LSDA for this frame. */
const uint8_t* lsda = (uint8_t*)_Unwind_GetLanguageSpecificData(context);
if ( lsda == (uint8_t*) 0 )
return _URC_CONTINUE_UNWIND;
return continueUnwind(exceptionObject, context);
uintptr_t pc = _Unwind_GetIP(context)-1;
uintptr_t funcStart = _Unwind_GetRegionStart(context);
@ -205,6 +236,6 @@ __gcc_personality_v0(int version, _Unwind_Action actions,
}
/* No landing pad found, continue unwinding. */
return _URC_CONTINUE_UNWIND;
return continueUnwind(exceptionObject, context);
}