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