14.13. Data Definitions for libgcc_s

This section defines global identifiers and their values that are associated with interfaces contained in libgcc_s. These definitions are organized into groups that correspond to system headers. This convention is used as a convenience for the reader, and does not imply the existence of these headers, or their content. Where an interface is defined as requiring a particular system header file all of the data definitions for that system header file presented here shall be in effect.

This section gives data definitions to promote binary application portability, not to repeat source interface definitions available elsewhere. System providers and application developers should use this ABI to supplement - not to replace - source interface definition specifications.

This specification uses the ISO C (1999) C Language as the reference programming language, and data definitions are specified in ISO C format. The C language is used here as a convenient notation. Using a C language description of these data objects does not preclude their use by other programming languages.

14.13.1. unwind.h

struct _Unwind_Context;
struct _Unwind_Exception;

typedef unsigned int _Unwind_Ptr __attribute__ ((__mode__(__pointer__)));
typedef unsigned int _Unwind_Word __attribute__ ((__mode__(__word__)));
typedef unsigned int _Unwind_Exception_Class
    __attribute__ ((__mode__(__DI__)));

typedef enum {
    _URC_NO_REASON = 0,
    _URC_END_OF_STACK = 5,
} _Unwind_Reason_Code;

typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
					      struct _Unwind_Exception *);

struct _Unwind_Exception {
    _Unwind_Exception_Class exception_class;
    _Unwind_Exception_Cleanup_Fn exception_cleanup;
    _Unwind_Word private_1;
    _Unwind_Word private_2;
} __attribute__ ((__aligned__));

#define _UA_SEARCH_PHASE	1
#define _UA_END_OF_STACK	16
#define _UA_FORCE_UNWIND	8

typedef int _Unwind_Action;

typedef _Unwind_Reason_Code(*_Unwind_Stop_Fn) (int version,
					       _Unwind_Action actions,
					       struct _Unwind_Exception *
					       struct _Unwind_Context *
					       void *stop_parameter);

typedef _Unwind_Reason_Code(*_Unwind_Trace_Fn) (struct _Unwind_Context *,
						void *);
extern _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void *);
extern void _Unwind_DeleteException(struct _Unwind_Exception *);
extern void *_Unwind_FindEnclosingFunction(void *);
extern _Unwind_Reason_Code _Unwind_ForcedUnwind(struct _Unwind_Exception *,
						_Unwind_Stop_Fn, void *);
extern _Unwind_Word _Unwind_GetCFA(struct _Unwind_Context *);
extern _Unwind_Word _Unwind_GetGR(struct _Unwind_Context *, int);
extern _Unwind_Ptr _Unwind_GetIP(struct _Unwind_Context *);
extern _Unwind_Ptr _Unwind_GetIPInfo(struct _Unwind_Context *, int *);
extern void *_Unwind_GetLanguageSpecificData(struct _Unwind_Context *);
extern _Unwind_Ptr _Unwind_GetRegionStart(struct _Unwind_Context *);
extern _Unwind_Reason_Code _Unwind_RaiseException(struct _Unwind_Exception
extern void _Unwind_Resume(struct _Unwind_Exception *);
extern _Unwind_Reason_Code _Unwind_Resume_or_Rethrow(struct
						     _Unwind_Exception *);
extern void _Unwind_SetGR(struct _Unwind_Context *, int, u_int64_t);
extern void _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Ptr);