diff -r 000000000000 -r 96e5fb8b040d kernel/eka/compsupp/aehabi/unwind_env.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/kernel/eka/compsupp/aehabi/unwind_env.h Thu Dec 17 09:24:54 2009 +0200 @@ -0,0 +1,264 @@ +/* unwind_env.h + * + * Copyright 2003 ARM Limited. + */ +/* + Licence + + 1. Subject to the provisions of clause 2, ARM hereby grants to LICENSEE a + perpetual, non-exclusive, nontransferable, royalty free, worldwide licence + to use this Example Implementation of Exception Handling solely for the + purpose of developing, having developed, manufacturing, having + manufactured, offering to sell, selling, supplying or otherwise + distributing products which comply with the Exception Handling ABI for the + ARM Architecture specification. All other rights are reserved to ARM or its + licensors. + + 2. THIS EXAMPLE IMPLEMENTATION OF EXCEPTION HANDLING IS PROVIDED "AS IS" + WITH NO WARRANTIES EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED + TO ANY WARRANTY OF SATISFACTORY QUALITY, MERCHANTABILITY, NONINFRINGEMENT + OR FITNESS FOR A PARTICULAR PURPOSE. +*/ +/* + * RCS $Revision: 1.3 $ + * Checkin $Date: 2003/10/23 13:57:32 $ + * Revising $Author: agrant $ + */ + +/* Environment definition - abstractions and requirements - to aid + * portability of the ARM exceptions code. + */ + +#ifndef UNWINDENV_H +#define UNWINDENV_H + +/* ---------------------------------------------------------------------- */ + +/* Source language + * + * The compiler is expected to define preprocessor symbols as follows: + * __cplusplus when compiling in C++ mode. + * __thumb when compiling to Thumb code. + * + * Some use is made of embedded assembly language, introduced by __asm. + * This is described in ARM's toolchain documentation. Some edits may be + * required for other compilers. The compiler should define one or more of: + * __TARGET_ARCH_4T __TARGET_ARCH_4TXM __TARGET_ARCH_5T __TARGET_ARCH_5TXM + * __TARGET_ARCH_5TE __TARGET_ARCH_6 + * so the correct assembly wrappers are generated for certain functions. + * + * __APCS_INTERWORK should be defined if ARM/Thumb interworking is required. + * + * For all the above symbols, if your compiler does not provide appropriate + * definitions, add them here. + * + * Some source language extensions are also used. + */ + +/* ---------------------------------------------------------------------- */ + +/* Library structure + * + * ARM's private make system contains an automated facility for compiling + * source files multiple times to create multiple object files. The source + * regions intended to constitute object file xxx.o are delimited by + * #ifdef xxx_c / #endif directives. The exact preprocessor symbols used + * for this conditionalisation are described in a comment at the start of + * each file. When porting to a different system, compilations must be + * performed with these preprocessor symbols appropriately defined + * (or remove the conditionalisation). + * + * ARM declares (or redeclares) some routines as weak in order that + * references to them are weak, so that the static linker will not load + * unwanted code. This is achieved by decorating routine declarations + * with appropriate language extensions. Note that compilers supporting + * similar features but via a different syntax may require edits to + * the library source. + * + * Define those decorations here (define as empty if not required): + */ + +#define WEAKDECL __weak /* token in C and C++ */ +#define WEAKASMDECL [WEAK] /* token in assembler */ + +/* ---------------------------------------------------------------------- */ + +/* Source language support and language extensions */ + +/* It is possible to compile the C++ semantics code using a compiler + * which does not support C++ exceptions; this was useful to ARM whilst + * ARM's compiler was being developed, and the facility has not been + * removed. C++ exceptions syntax is conditionalised by + * #ifdef ARM_EXCEPTIONS_ENABLED / #endif. Define ARM_EXCEPTIONS_ENABLED + * by some means here if you want a usable library: + */ + +#ifdef __cplusplus +extern "C" { + /* For conditionalisation, specifically on ARM_EXCEPTIONS_ENABLED */ +#include "basics.h" +} +#endif + +/* The following definitions of syntax decoration may be empty if the + * facility is not required. Note that compilers supporting similar + * features but via a different syntax may require edits to the library + * source. + * + * Define the decorations here (define as empty if not required): + */ + +/* If the compiler understands noreturn functions: */ +#define NORETURNDECL __declspec(noreturn) + +/* ---------------------------------------------------------------------- */ + +/* Types */ + +/* The implementation requires types uint8_t, uint16_t, uint32_t and + * uint64_t to be defined as unsigned integers of the appropriate number + * of bits. + * + * Do that here: + */ + +#include + +/* The C++ semantics support requires definition of the RTTI object + * layout. We use the same structures and names as the generic C++ + * ABI for Itanium. + * + * Define those structures here: + */ + +#ifdef __cplusplus +extern "C" { +#include "cxxabi.h" +} +#endif + +/* ---------------------------------------------------------------------- */ + +/* External requirements */ + +/* The C++ exception-handling 'globals' should be allocated per-thread. + * The Exceptions ABI does not specify how this happens, but it is + * intended that the details are localised to __cxa_get_globals. + * + * In the ARM implementation of __cxa_get_globals, it is assumed that a + * zero-initialised location in a known per-thread place is somehow + * obtainable, and can be assigned (by __cxa_get_globals) a pointer to + * the allocated globals data structure. The macro EH_GLOBALS should be + * defined here to yield a suitable address of type void*. This is used + * only in __cxa_get_globals. + * + * Define it here: + */ + +#ifdef __cplusplus +extern "C" { + /* for __user_libspace() machinery */ +#include +#define EH_GLOBALS libspace.eh_globals +} +#endif + + +/* A routine is required for C++ derived class to base class conversion. + * This is used once, in __cxa_type_match. It is likely that suitable + * code exists as part of the RTTI support code. Therefore access it + * via a macro: + * DERIVED_TO_BASE_CONVERSION(PTR, P_NEW_PTR, CLASS_INFO, BASE_INFO) + * Convert PTR from a pointer to a derived class (described by + * CLASS_INFO) to a pointer to a base class (described by BASE_INFO) + * and store the resulting pointer in P_NEW_PTR. Return true (or + * non-zero) if the base class was found and the conversion was done, + * otherwise return false (or zero). + * + * Define the macro here: + */ + +#ifdef __cplusplus +/* In the ARM implementation, a suitable routine exists elsewhere in the + * C++ runtime library, where it is part of the dynamic_cast mechanism. + */ +extern "C" int __derived_to_base_conversion(void** p_ptr, void** p_new_ptr, + const std::type_info * class_info, + const std::type_info * base_info, + char** access_flags, int use_access_flags); + +#define DERIVED_TO_BASE_CONVERSION(PTR, P_NEW_PTR, CLASS_INFO, BASE_INFO) \ + __derived_to_base_conversion(&(PTR), (P_NEW_PTR), (CLASS_INFO), (BASE_INFO), NULL, 0) +#endif + + +/* ---------------------------------------------------------------------- */ + +/* Runtime debug support + * + * Here we define the interface to a "bottleneck function" to be called + * by exception handling code at 'interesting' points during execution, + * and breakpointable by a debugger. + * + * This is not part of the Exceptions ABI but is expected to be + * standardised elsewhere, probably in a Debug ABI. + * + * If you don't want this, define DEBUGGER_BOTTLENECK as a dummy, e.g. + * #define DEBUGGER_BOTTLENECK(UCBP,LANG,ACTIVITY,ARG) (void)0 + */ + +#ifdef __cplusplus +extern "C" { +#endif + + struct _Unwind_Control_Block; + + typedef enum { + _UASUBSYS_CPP = 0x00, + _UASUBSYS_UNWINDER = 0xff + } _Unwind_Activity_subsystem; + + typedef enum { + _UAACT_STARTING = 0x0, + _UAACT_ENDING = 0x1, + _UAACT_BARRIERFOUND = 0x2, + _UAACT_PADENTRY = 0x3, + _UAACT_CPP_TYPEINFO = 0x80 + } _Unwind_Activity_activity; + + typedef enum { + _UAARG_ENDING_UNSPECIFIED = 0x0, + _UAARG_ENDING_TABLECORRUPT = 0x1, + _UAARG_ENDING_NOUNWIND = 0x2, + _UAARG_ENDING_VRSFAILED = 0x3, + /* C++ only: */ + _UAARG_ENDING_CPP_BADOPCODE = 0x4, + /* Unwinder only: */ + _UAARG_ENDING_UNWINDER_LOOKUPFAILED = 0x4, + _UAARG_ENDING_UNWINDER_BUFFERFAILED = 0x5 + } _Unwind_Activity_arg; + + void _Unwind_Activity(struct _Unwind_Control_Block *ucbp, uint32_t reason, uint32_t arg); +#define DEBUGGER_BOTTLENECK(UCBP,LANG,ACTIVITY,ARG) \ + _Unwind_Activity((UCBP),(((LANG)<<24)|ACTIVITY),(uint32_t)(ARG)) + +#ifdef __cplusplus +} +#endif + + +/* ---------------------------------------------------------------------- */ + +/* Printed diagnostics + * + * These may be useful for debugging purposes during development, provided + * the execution environment supports diagnostics via printf. + * + * #define PR_DIAGNOSTICS for printed diagnostics from the personality routine. + * #define VRS_DIAGNOSTICS for printed diagnostics about VRS operations. + * #define UNWIND_ACTIVITY_DIAGNOSTICS for printed information from _Unwind_Activity. + */ + +/* ---------------------------------------------------------------------- */ + +#endif /* defined UNWINDENV_H */