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root/Oni2/Daodan/src/Daodan_Patch.c

Comparing Daodan/src/Daodan_Patch.c (file contents):
Revision 677 by alloc, Sat Mar 2 23:46:33 2013 UTC vs.
Revision 990 by alloc, Wed Apr 2 00:48:54 2014 UTC

#	Line 1 | Line 1
1		#include "Daodan_Patch.h"
2	+	#include "Daodan_Utility.h"
3	+	#include <beaengine/BeaEngine.h>
4	+
5		#include <windows.h>
6		#include <stdlib.h>
7		#include <string.h>
#	Line 9 | Line 12 | bool DDrPatch_MakeJump(void* from, void*
12
13		if (VirtualProtect(from, 5, PAGE_EXECUTE_READWRITE, &oldp))
14		{
15	<	*((char*)from) = 0xe9; // jmp rel32
15	>	*((unsigned char*)from) = 0xe9; // jmp rel32
16		from = (char*)from + 1;
17		*(int*)from = (unsigned int)to - (unsigned int)from - 4;
18		VirtualProtect(from, 5, oldp, &oldp);
#	Line 25 | Line 28 | bool DDrPatch_MakeCall(void* from, void*
28
29		if (VirtualProtect(from, 5, PAGE_EXECUTE_READWRITE, &oldp))
30		{
31	<	*((char*)from) = 0xe8; // call rel32
31	>	*((unsigned char*)from) = 0xe8; // call rel32
32		from = (char*)from + 1;
33		*(int*)from = (unsigned int)to - (unsigned int)from - 4;
34		VirtualProtect(from, 5, oldp, &oldp);
#	Line 35 | Line 38 | bool DDrPatch_MakeCall(void* from, void*
38		return false;
39		}
40
41	<	bool DDrPatch_String(char* dest, const char* string, int length)
41	>	void* DDrPatch_MakeDetour(void* from, void* to)
42	>	{
43	>	int len = 0;
44	>	/*
45	>	DISASM MyDisasm;
46	>	int i = 0;
47	>	DDrStartupMessage("");
48	>	DDrStartupMessage("");
49	>
50	>	memset (&MyDisasm, 0, sizeof(DISASM));
51	>	MyDisasm.EIP = (UIntPtr) from;
52	>	i = 0;
53	>	DDrStartupMessage("Orig before @ 0x%06x", from);
54	>	while (i<10){
55	>	len = Disasm(&MyDisasm);
56	>	if (len != UNKNOWN_OPCODE) {
57	>	DDrStartupMessage("%s, Opcode: 0x%x, len: %d, branch: %d, to: 0x%06x", MyDisasm.CompleteInstr, MyDisasm.Instruction.Opcode, len, MyDisasm.Instruction.BranchType, MyDisasm.Instruction.AddrValue);
58	>	DDrStartupMessage("    Cat: 0x%04x, prefix count: %d", MyDisasm.Instruction.Category & 0xffff, MyDisasm.Prefix.Number );
59	>	MyDisasm.EIP += (UIntPtr)len;
60	>	i++;
61	>	}
62	>	};
63	>	DDrStartupMessage("");
64	>	*/
65	>
66	>	DISASM disasm;
67	>	memset(&disasm, 0, sizeof(DISASM));
68	>	disasm.EIP = (UIntPtr) from;
69	>
70	>	char* trampoline = malloc(40);
71	>	DDrPatch_NOOP(trampoline, 40);
72	>	int pos = 0;
73	>	int branches = 0;
74	>
75	>	while (((void*)disasm.EIP - from) < 5) {
76	>	len = Disasm(&disasm);
77	>	if (len != UNKNOWN_OPCODE) {
78	>	if ((disasm.Instruction.Category & 0xffff) == CONTROL_TRANSFER) {
79	>	if (disasm.Prefix.Number > 0) {
80	>	DDrStartupMessage("Daodan: Detour: Branch in trampoline area from address 0x%08x with prefixes", from);
81	>	return (void*)-1;
82	>	}
83	>	branches++;
84	>	int target = disasm.Instruction.AddrValue;
85	>	bool targetInTrampoline = ((void*)disasm.Instruction.AddrValue - from) < 5;
86	>	switch (disasm.Instruction.BranchType) {
87	>	case JmpType:
88	>	case CallType:
89	>	if (targetInTrampoline) {
90	>	int offset = disasm.Instruction.AddrValue - disasm.EIP;
91	>	if (disasm.Instruction.BranchType == JmpType)
92	>	DDrPatch_MakeJump(&trampoline[pos], &trampoline[pos]+offset);
93	>	else
94	>	DDrPatch_MakeCall(&trampoline[pos], &trampoline[pos]+offset);
95	>	} else {
96	>	if (disasm.Instruction.BranchType == JmpType)
97	>	DDrPatch_MakeJump(&trampoline[pos], (void*)target);
98	>	else
99	>	DDrPatch_MakeCall(&trampoline[pos], (void*)target);
100	>	}
101	>	pos += 5;
102	>	break;
103	>	case RetType:
104	>	case JECXZ:
105	>	memcpy(&trampoline[pos], (void*)disasm.EIP, len);
106	>	pos += len;
107	>	break;
108	>	// Opcode +1
109	>	case JO:
110	>	case JC:
111	>	case JE:
112	>	case JNA:
113	>	case JS:
114	>	case JP:
115	>	case JL:
116	>	case JNG:
117	>	if (targetInTrampoline) {
118	>	memcpy(&trampoline[pos], (void*)disasm.EIP, len);
119	>	pos += len;
120	>	} else {
121	>	trampoline[pos++] = disasm.Instruction.Opcode + 1;
122	>	trampoline[pos++] = 5;
123	>	DDrPatch_MakeJump(&trampoline[pos], (void*)target);
124	>	pos += 5;
125	>	}
126	>	break;
127	>	// Opcode -1
128	>	case JNO:
129	>	case JNC:
130	>	case JNE:
131	>	case JA:
132	>	case JNS:
133	>	case JNP:
134	>	case JNL:
135	>	case JG:
136	>	if (targetInTrampoline) {
137	>	memcpy(&trampoline[pos], (void*)disasm.EIP, len);
138	>	pos += len;
139	>	} else {
140	>	trampoline[pos++] = disasm.Instruction.Opcode - 1;
141	>	trampoline[pos++] = 5;
142	>	DDrPatch_MakeJump(&trampoline[pos], (void*)target);
143	>	pos += 5;
144	>	}
145	>	break;
146	>	default:
147	>	DDrStartupMessage("Daodan: Detour: Unknown branch in trampoline area from address 0x%08x", from);
148	>	return (void*)-1;
149	>	}
150	>	} else {
151	>	memcpy(&trampoline[pos], (void*)disasm.EIP, len);
152	>	pos += len;
153	>	}
154	>	disasm.EIP += (UIntPtr)len;
155	>	}
156	>	else {
157	>	DDrStartupMessage("Daodan: Detour: Unknown opcode in trampoline area from address 0x%08x", from);
158	>	return (void*)-1;
159	>	}
160	>	}
161	>
162	>	if (branches > 1) {
163	>	DDrStartupMessage("Daodan: Detour: Too many branches in trampoline'd code from address 0x%08x: %d", from, branches);
164	>	return (void*)-1;
165	>	}
166	>
167	>
168	>	DDrPatch_MakeJump(&trampoline[pos], (void*)disasm.EIP);
169	>	DDrPatch_NOOP(from, (void*)disasm.EIP - from);
170	>
171	>	DWORD oldp;
172	>	if (!VirtualProtect(trampoline, 40, PAGE_EXECUTE_READWRITE, &oldp)) {
173	>	DDrStartupMessage("Daodan: Detour: Could not mark page for trampoline as executable: from address 0x%08x", from);
174	>	return (void*)-1;
175	>	}
176	>	DDrPatch_MakeJump(from, to);
177	>	/*
178	>	memset (&MyDisasm, 0, sizeof(DISASM));
179	>	MyDisasm.EIP = (UIntPtr) trampoline;
180	>	i = 0;
181	>	DDrStartupMessage("Trampoline @ 0x%06x", trampoline);
182	>	while (i<10){
183	>	len = Disasm(&MyDisasm);
184	>	if (len != UNKNOWN_OPCODE) {
185	>	DDrStartupMessage(MyDisasm.CompleteInstr);
186	>	MyDisasm.EIP += (UIntPtr)len;
187	>	i++;
188	>	}
189	>	};
190	>	DDrStartupMessage("");
191	>
192	>	memset (&MyDisasm, 0, sizeof(DISASM));
193	>	MyDisasm.EIP = disasm.EIP;
194	>	i = 0;
195	>	DDrStartupMessage("Orig after @ 0x%06x", disasm.EIP);
196	>	while (i<7){
197	>	len = Disasm(&MyDisasm);
198	>	if (len != UNKNOWN_OPCODE) {
199	>	DDrStartupMessage(MyDisasm.CompleteInstr);
200	>	MyDisasm.EIP += (UIntPtr)len;
201	>	i++;
202	>	}
203	>	};
204	>	DDrStartupMessage("");
205	>
206	>	memset (&MyDisasm, 0, sizeof(DISASM));
207	>	MyDisasm.EIP = (UIntPtr) from;
208	>	i = 0;
209	>	DDrStartupMessage("Orig start after @ 0x%06x", from);
210	>	while (i<3){
211	>	len = Disasm(&MyDisasm);
212	>	if (len != UNKNOWN_OPCODE) {
213	>	DDrStartupMessage(MyDisasm.CompleteInstr);
214	>	MyDisasm.EIP += (UIntPtr)len;
215	>	i++;
216	>	}
217	>	};
218	>	DDrStartupMessage("");
219	>	DDrStartupMessage("");
220	>	DDrStartupMessage("");
221	>	*/
222	>
223	>	return trampoline;
224	>	}
225	>
226	>	bool DDrPatch_String(char* dest, const unsigned char* string, int length)
227		{
228		DWORD oldp;
229
#	Line 49 | Line 237 | bool DDrPatch_String(char* dest, const c
237		return false;
238		}
239
240	<	bool DDrPatch_Byte(char* dest, char value)
240	>	bool DDrPatch_Byte(char* dest, unsigned char value)
241		{
242		DWORD oldp;
243
#	Line 63 | Line 251 | bool DDrPatch_Byte(char* dest, char valu
251		return false;
252		}
253
254	<	bool DDrPatch_Int32(int* dest, int value)
254	>	bool DDrPatch_Int32(int* dest, unsigned int value)
255		{
256		DWORD oldp;
257
#	Line 77 | Line 265 | bool DDrPatch_Int32(int* dest, int value
265		return false;
266		}
267
268	<	bool DDrPatch_Int16(short* dest, short value)
268	>	bool DDrPatch_Int16(short* dest, unsigned short value)
269		{
270		DWORD oldp;
271

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