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76 lines
3.1 KiB
76 lines
3.1 KiB
// mach_override.h semver:1.2.0
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// Copyright (c) 2003-2012 Jonathan 'Wolf' Rentzsch: http://rentzsch.com
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// Some rights reserved: http://opensource.org/licenses/mit
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// https://github.com/rentzsch/mach_override
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#ifndef _mach_override_
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#define _mach_override_
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#include <sys/types.h>
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#include <mach/error.h>
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#define err_cannot_override (err_local|1)
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__BEGIN_DECLS
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/****************************************************************************************
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Dynamically overrides the function implementation referenced by
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originalFunctionAddress with the implentation pointed to by overrideFunctionAddress.
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Optionally returns a pointer to a "reentry island" which, if jumped to, will resume
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the original implementation.
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@param originalFunctionAddress -> Required address of the function to
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override (with overrideFunctionAddress).
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@param overrideFunctionAddress -> Required address to the overriding
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function.
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@param originalFunctionReentryIsland <- Optional pointer to pointer to the
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reentry island. Can be NULL.
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@result <- err_cannot_override if the original
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function's implementation begins with
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the 'mfctr' instruction.
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************************************************************************************/
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mach_error_t
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mach_override_ptr(
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void *originalFunctionAddress,
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const void *overrideFunctionAddress,
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void **originalFunctionReentryIsland );
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__END_DECLS
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/****************************************************************************************
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If you're using C++ this macro will ease the tedium of typedef'ing, naming, keeping
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track of reentry islands and defining your override code. See test_mach_override.cp
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for example usage.
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************************************************************************************/
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#ifdef __cplusplus
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#define MACH_OVERRIDE( ORIGINAL_FUNCTION_RETURN_TYPE, ORIGINAL_FUNCTION_NAME, ORIGINAL_FUNCTION_ARGS, ERR ) \
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{ \
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static ORIGINAL_FUNCTION_RETURN_TYPE (*ORIGINAL_FUNCTION_NAME##_reenter)ORIGINAL_FUNCTION_ARGS; \
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static bool ORIGINAL_FUNCTION_NAME##_overriden = false; \
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class mach_override_class__##ORIGINAL_FUNCTION_NAME { \
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public: \
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static kern_return_t override(void *originalFunctionPtr) { \
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kern_return_t result = err_none; \
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if (!ORIGINAL_FUNCTION_NAME##_overriden) { \
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ORIGINAL_FUNCTION_NAME##_overriden = true; \
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result = mach_override_ptr( (void*)originalFunctionPtr, \
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(void*)mach_override_class__##ORIGINAL_FUNCTION_NAME::replacement, \
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(void**)&ORIGINAL_FUNCTION_NAME##_reenter ); \
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} \
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return result; \
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} \
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static ORIGINAL_FUNCTION_RETURN_TYPE replacement ORIGINAL_FUNCTION_ARGS {
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#define END_MACH_OVERRIDE( ORIGINAL_FUNCTION_NAME ) \
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} \
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}; \
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\
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err = mach_override_class__##ORIGINAL_FUNCTION_NAME::override((void*)ORIGINAL_FUNCTION_NAME); \
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}
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#endif
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#endif // _mach_override_
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