71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/**
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* =============================================================================
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* DynamicHooks
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* Copyright (C) 2015 Robin Gohmert. All rights reserved.
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* =============================================================================
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*
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* This software is provided 'as-is', without any express or implied warranty.
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* In no event will the authors be held liable for any damages arising from
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* the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software in a
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* product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* asm.h/cpp from devmaster.net (thanks cybermind) edited by pRED* to handle gcc
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* -fPIC thunks correctly
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*
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* Idea and trampoline code taken from DynDetours (thanks your-name-here).
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*/
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#ifndef __ASM_H__
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#define __ASM_H__
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#define OP_JMP 0xE9
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#define OP_JMP_SIZE 5
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#define OP_NOP 0x90
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#define OP_NOP_SIZE 1
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#define OP_PREFIX 0xFF
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#define OP_JMP_SEG 0x25
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#define OP_JMP_BYTE 0xEB
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#define OP_JMP_BYTE_SIZE 2
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#ifdef __cplusplus
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extern "C" {
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#endif
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void check_thunks(unsigned char *dest, unsigned char *pc);
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//if dest is NULL, returns minimum number of bytes needed to be copied
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//if dest is not NULL, it will copy the bytes to dest as well as fix CALLs and JMPs
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//http://www.devmaster.net/forums/showthread.php?t=2311
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int copy_bytes(unsigned char *func, unsigned char* dest, int required_len);
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//insert a specific JMP instruction at the given location
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void inject_jmp(void* src, void* dest);
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//fill a given block with NOPs
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void fill_nop(void* src, unsigned int len);
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//evaluate a JMP at the target
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void* eval_jump(void* src);
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#ifdef __cplusplus
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}
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#endif
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#endif //__ASM_H__
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