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patches.h
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1/*
2
3MIT License
4
5Copyright (c) 2021 PCSX-Redux authors
6
7Permission is hereby granted, free of charge, to any person obtaining a copy
8of this software and associated documentation files (the "Software"), to deal
9in the Software without restriction, including without limitation the rights
10to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11copies of the Software, and to permit persons to whom the Software is
12furnished to do so, subject to the following conditions:
13
14The above copyright notice and this permission notice shall be included in all
15copies or substantial portions of the Software.
16
17THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23SOFTWARE.
24
25*/
26
27#pragma once
28
29#include <stdint.h>
30
31/*
32 Most PSX games will have kernel patches within them. Most (but not all)
33 of these patches will call B0:56 and B0:57 to get the pointer of the
34 B0 and C0 tables. It will be close to impossible for us to create code
35 in a way that will make these patches work properly transparently, so
36 instead we will rely on the fact they are calling these two functions,
37 and then we patch them out after we detect them. This assumes that these
38 two functions aren't called for anything else but the patches. The
39 boolean below controls if we want to be permissive or not with unrecognized
40 patches. It is currently set to 1, and probably should remain so for a
41 long time, until we are sure we got all the patches properly.
42
43 Then, depending on the patch itself, we may change our kernel's behavior,
44 in order to emulate what the original patch was trying to do.
45*/
46
47extern int g_patch_permissive;
48
50void patch_hook(uint32_t* ra, enum patch_table table);
51
patch_behavior
Definition patches.h:52
@ PATCH_COUNTERPATCH
Definition patches.h:52
@ PATCH_PASSTHROUGH
Definition patches.h:52
@ PATCH_NOT_MATCHING
Definition patches.h:52
patch_table
Definition patches.h:49
@ PATCH_TABLE_B0
Definition patches.h:49
@ PATCH_TABLE_C0
Definition patches.h:49
int g_patch_permissive
Definition patches.c:36
void patch_hook(uint32_t *ra, enum patch_table table)
Definition patches.c:168
void uint32_t(classId, spec)