Implement ARM EHABI exception handling.
This commit implements the ARM zero-cost exception handling
support for libc++abi.
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@208466 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/cxxabi.h b/include/cxxabi.h
index 66ef6d4..82a7e74 100644
--- a/include/cxxabi.h
+++ b/include/cxxabi.h
@@ -44,6 +44,10 @@
extern void * __cxa_get_exception_ptr(void * exceptionObject) throw();
extern void * __cxa_begin_catch(void * exceptionObject) throw();
extern void __cxa_end_catch();
+#if __arm__
+extern bool __cxa_begin_cleanup(void * exceptionObject) throw();
+extern void __cxa_end_cleanup();
+#endif
extern std::type_info * __cxa_current_exception_type();
// 2.5.4 Rethrowing Exceptions
diff --git a/include/unwind.h b/include/unwind.h
index 673e060..131657d 100644
--- a/include/unwind.h
+++ b/include/unwind.h
@@ -23,8 +23,16 @@
#define LIBUNWIND_UNAVAIL
#endif
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && defined(__arm__) && \
+ !defined(__ARM_DWARF_EH__) && !defined(__APPLE__)
+#define LIBCXXABI_ARM_EHABI 1
+#else
+#define LIBCXXABI_ARM_EHABI 0
+#endif
+
typedef enum {
_URC_NO_REASON = 0,
+ _URC_OK = 0,
_URC_FOREIGN_EXCEPTION_CAUGHT = 1,
_URC_FATAL_PHASE2_ERROR = 2,
_URC_FATAL_PHASE1_ERROR = 3,
@@ -32,7 +40,8 @@
_URC_END_OF_STACK = 5,
_URC_HANDLER_FOUND = 6,
_URC_INSTALL_CONTEXT = 7,
- _URC_CONTINUE_UNWIND = 8
+ _URC_CONTINUE_UNWIND = 8,
+ _URC_FAILURE = 9
} _Unwind_Reason_Code;
typedef enum {
@@ -43,13 +52,69 @@
_UA_END_OF_STACK = 16 // gcc extension to C++ ABI
} _Unwind_Action;
+
+#if LIBCXXABI_ARM_EHABI
+typedef uint32_t _Unwind_State;
+
+static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME = 0;
+static const _Unwind_State _US_UNWIND_FRAME_STARTING = 1;
+static const _Unwind_State _US_UNWIND_FRAME_RESUME = 2;
+
+typedef uint32_t _Unwind_EHT_Header;
+
+struct _Unwind_Control_Block;
+typedef struct _Unwind_Control_Block _Unwind_Control_Block;
+typedef struct _Unwind_Control_Block _Unwind_Exception; /* Alias */
+
+struct _Unwind_Control_Block {
+ uint64_t exception_class;
+ void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block*);
+
+ struct {
+ uint32_t reserved1;
+ uint32_t reserved2;
+ uint32_t reserved3;
+ uint32_t reserved4;
+ uint32_t reserved5;
+ } unwinder_cache;
+
+ struct {
+ uint32_t sp;
+ uint32_t bitpattern[5];
+ } barrier_cache;
+
+ struct {
+ uint32_t bitpattern[4];
+ } cleanup_cache;
+
+ struct {
+ uint32_t fnstart;
+ _Unwind_EHT_Header* ehtp;
+ uint32_t additional;
+ uint32_t reserved1;
+ } pr_cache;
+
+ long long int :0; /* Enforce the 8-byte alignment */
+};
+
+typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
+ (_Unwind_State state,
+ _Unwind_Exception* exceptionObject,
+ struct _Unwind_Context* context);
+
+typedef _Unwind_Reason_Code (*__personality_routine)
+ (_Unwind_State state,
+ _Unwind_Exception* exceptionObject,
+ struct _Unwind_Context* context);
+#else
struct _Unwind_Context; // opaque
struct _Unwind_Exception; // forward declaration
+typedef struct _Unwind_Exception _Unwind_Exception;
struct _Unwind_Exception {
uint64_t exception_class;
void (*exception_cleanup)(_Unwind_Reason_Code reason,
- struct _Unwind_Exception *exc);
+ _Unwind_Exception *exc);
uintptr_t private_1; // non-zero means forced unwind
uintptr_t private_2; // holds sp that phase1 found for phase2 to use
#if !__LP64__
@@ -65,7 +130,7 @@
(int version,
_Unwind_Action actions,
uint64_t exceptionClass,
- struct _Unwind_Exception* exceptionObject,
+ _Unwind_Exception* exceptionObject,
struct _Unwind_Context* context,
void* stop_parameter );
@@ -73,8 +138,9 @@
(int version,
_Unwind_Action actions,
uint64_t exceptionClass,
- struct _Unwind_Exception* exceptionObject,
+ _Unwind_Exception* exceptionObject,
struct _Unwind_Context* context);
+#endif
#ifdef __cplusplus
extern "C" {
@@ -85,29 +151,90 @@
//
#if __USING_SJLJ_EXCEPTIONS__
extern _Unwind_Reason_Code
- _Unwind_SjLj_RaiseException(struct _Unwind_Exception *exception_object);
-extern void _Unwind_SjLj_Resume(struct _Unwind_Exception *exception_object);
+ _Unwind_SjLj_RaiseException(_Unwind_Exception *exception_object);
+extern void _Unwind_SjLj_Resume(_Unwind_Exception *exception_object);
#else
extern _Unwind_Reason_Code
- _Unwind_RaiseException(struct _Unwind_Exception *exception_object);
-extern void _Unwind_Resume(struct _Unwind_Exception *exception_object);
+ _Unwind_RaiseException(_Unwind_Exception *exception_object);
+extern void _Unwind_Resume(_Unwind_Exception *exception_object);
#endif
-extern void _Unwind_DeleteException(struct _Unwind_Exception *exception_object);
+extern void _Unwind_DeleteException(_Unwind_Exception *exception_object);
+
+#if LIBCXXABI_ARM_EHABI
+typedef enum {
+ _UVRSC_CORE = 0,
+ _UVRSC_VFP = 1,
+ _UVRSC_WMMXD = 3,
+ _UVRSC_WMMXC = 4
+} _Unwind_VRS_RegClass;
+
+typedef enum {
+ _UVRSD_UINT32 = 0,
+ _UVRSD_VFPX = 1,
+ _UVRSD_UINT64 = 3,
+ _UVRSD_FLOAT = 4,
+ _UVRSD_DOUBLE = 5
+} _Unwind_VRS_DataRepresentation;
+
+typedef enum {
+ _UVRSR_OK = 0,
+ _UVRSR_NOT_IMPLEMENTED = 1,
+ _UVRSR_FAILED = 2
+} _Unwind_VRS_Result;
+
+extern _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context* context,
+ _Unwind_VRS_RegClass regclass,
+ uint32_t regno,
+ _Unwind_VRS_DataRepresentation representation,
+ void *valuep);
+
+extern _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context* context,
+ _Unwind_VRS_RegClass regclass,
+ uint32_t regno,
+ _Unwind_VRS_DataRepresentation representation,
+ void *valuep);
+
+static inline uintptr_t _Unwind_GetGR(struct _Unwind_Context* context,
+ int index) {
+ uintptr_t value = 0;
+ _Unwind_VRS_Get(context, _UVRSC_CORE, (uint32_t)index, _UVRSD_UINT32, &value);
+ return value;
+}
+
+static inline void _Unwind_SetGR(struct _Unwind_Context* context, int index,
+ uintptr_t new_value) {
+ _Unwind_VRS_Set(context, _UVRSC_CORE, (uint32_t)index,
+ _UVRSD_UINT32, &new_value);
+}
+
+static inline uintptr_t _Unwind_GetIP(struct _Unwind_Context* context) {
+ // remove the thumb-bit before returning
+ return (_Unwind_GetGR(context, 15) & (~(uintptr_t)0x1));
+}
+
+static inline void _Unwind_SetIP(struct _Unwind_Context* context,
+ uintptr_t new_value) {
+ uintptr_t thumb_bit = _Unwind_GetGR(context, 15) & ((uintptr_t)0x1);
+ _Unwind_SetGR(context, 15, new_value | thumb_bit);
+}
+#else
extern uintptr_t _Unwind_GetGR(struct _Unwind_Context *context, int index);
extern void _Unwind_SetGR(struct _Unwind_Context *context, int index,
uintptr_t new_value);
extern uintptr_t _Unwind_GetIP(struct _Unwind_Context *context);
extern void _Unwind_SetIP(struct _Unwind_Context *, uintptr_t new_value);
+#endif
+
extern uintptr_t _Unwind_GetRegionStart(struct _Unwind_Context *context);
extern uintptr_t
_Unwind_GetLanguageSpecificData(struct _Unwind_Context *context);
#if __USING_SJLJ_EXCEPTIONS__
extern _Unwind_Reason_Code
- _Unwind_SjLj_ForcedUnwind(struct _Unwind_Exception *exception_object,
+ _Unwind_SjLj_ForcedUnwind(_Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter);
#else
extern _Unwind_Reason_Code
- _Unwind_ForcedUnwind(struct _Unwind_Exception *exception_object,
+ _Unwind_ForcedUnwind(_Unwind_Exception *exception_object,
_Unwind_Stop_Fn stop, void *stop_parameter);
#endif
@@ -126,10 +253,10 @@
//
#if __USING_SJLJ_EXCEPTIONS__
extern _Unwind_Reason_Code
- _Unwind_SjLj_Resume_or_Rethrow(struct _Unwind_Exception *exception_object);
+ _Unwind_SjLj_Resume_or_Rethrow(_Unwind_Exception *exception_object);
#else
extern _Unwind_Reason_Code
- _Unwind_Resume_or_Rethrow(struct _Unwind_Exception *exception_object);
+ _Unwind_Resume_or_Rethrow(_Unwind_Exception *exception_object);
#endif
// _Unwind_Backtrace() is a gcc extension that walks the stack and calls the