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/*
* Copyright (c) 2013, NVIDIA CORPORATION.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and/or associated documentation files (the
* "Materials"), to deal in the Materials without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Materials, and to
* permit persons to whom the Materials are furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* unaltered in all copies or substantial portions of the Materials.
* Any additions, deletions, or changes to the original source files
* must be clearly indicated in accompanying documentation.
*
* If only executable code is distributed, then the accompanying
* documentation must state that "this software is based in part on the
* work of the Khronos Group."
*
* THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
*/
#include <GL/gl.h>
#if !defined(__GL_DISPATCH_ABI_H)
#define __GL_DISPATCH_ABI_H
#if defined(__cplusplus)
extern "C" {
#endif
/*!
* \defgroup gldispatchabi GL dispatching ABI
*
* This is not a complete ABI, but rather a fragment common to the libEGL and
* libGLX ABIs. Changes to this file should be accompanied by a version bump to
* these client ABIs.
*/
/*!
* Thread-local implementation used by libglvnd. This is passed into the patch
* function callback via the type parameter.
*
* For most architectures, the vendor library can ignore this parameter, since
* it will always be the same value. It's used for systems like ARM, where the
* stubs might be use the ARM or Thumb instruction sets.
*
* The stub type does not make any distinction between TLS and TSD stubs. The
* entire purpose of entrypoint rewriting is to skip the dispatch table in
* libGLdispatch.so, so it doesn't matter how that dispatch table is stored.
*/
enum {
/*!
* Indicates that the stubs aren't defined in assembly. For example, if the
* dispatch stubs are written in C. Vendor libraries generally won't see
* this value.
*/
__GLDISPATCH_STUB_UNKNOWN,
/*!
* Used for stubs on x86 systems.
*/
__GLDISPATCH_STUB_X86,
/*!
* Used for stubs on x86-64 systems.
*/
__GLDISPATCH_STUB_X86_64,
/*!
* Used for stubs on ARMv7, using the Thumb instruction set.
*/
__GLDISPATCH_STUB_ARMV7_THUMB,
/*!
* Used for stubs on ARMv7, using the normal ARM instruction set.
*/
__GLDISPATCH_STUB_ARMV7_ARM,
/*!
* Used for stubs on ARMv8/aarch64.
*/
__GLDISPATCH_STUB_AARCH64,
/*!
* Used for stubs on x32 builds (x86-64 with 32-bit pointers).
*/
__GLDISPATCH_STUB_X32,
/*!
* Used for stubs on PPC64 systems.
*/
__GLDISPATCH_STUB_PPC64,
/*!
* Used for stubs on PPC64LE systems. Same as PPC64, for compatibility.
*/
__GLDISPATCH_STUB_PPC64LE = __GLDISPATCH_STUB_PPC64,
};
/*!
* A callback function called by the vendor library to fetch the address of an
* entrypoint.
*
* The function returns two pointers, one writable and one executable. The two
* pointers may or may not be the same virtual address, but they will both be
* mappings of the same physical memory.
*
* The vendor library should write its entrypoint to the address returned by
* \p writePtr, but should use the address from \p execPtr for things like
* calculating PC-relative offsets.
*
* Note that if this function fails, then the vendor library can still try to
* patch other entrypoints.
*
* Note that on ARM, the low-order bit of both \c execPtr and \p writePtr will
* be zero, even if the stub uses the thumb instruction set. The vendor library
* should use the \c type parameter of \c initiatePatch to determine which
* instruction set to use.
*
* \param funcName The function name.
* \param[out] writePtr The pointer that the vendor library can write to.
* \param[out] execPtr The pointer to the executable code.
* \return GL_TRUE if the entrypoint exists, or GL_FALSE if it doesn't.
*/
typedef GLboolean (*DispatchPatchLookupStubOffset)(const char *funcName,
void **writePtr, const void **execPtr);
#if defined(__cplusplus)
}
#endif
#endif // __GL_DISPATCH_ABI_H
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