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[Core/VDP] fixed address/code potential corruption by one-instruction execution delay after HV interrupts activation (fixes #477)

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ekeeke 2023-01-13 14:00:27 +01:00
parent 70cfbd909f
commit a2380d84e0
6 changed files with 7 additions and 6 deletions
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1
HISTORY.txt
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@ -151,6 +151,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* fixed Master System II extended video modes sprite parsing (fixes Mega Man 2 demo)
* fixed Game Gear display rendering regression when left/right borders were disabled
* fixed 68k cycles delay on invalid VRAM writes (fixes "Microcosm" intro loop)
* fixed address/code potential corruption by one-instruction execution delay after HV interrupts activation (fixes Pugsy's Pyramids stage boss)
* optimized tile caching
[Core/Sound]

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builds/genesis_plus_gx_libretro.dll
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builds/genplus_cube.dol
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10
core/vdp_ctrl.c
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@ -5,7 +5,7 @@
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2022 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2023 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -721,6 +721,10 @@ void vdp_68k_ctrl_w(unsigned int data)
}
}
/* Update address and code registers */
addr = addr_latch | (data & 0x3FFF);
code = ((code & 0x3C) | ((data >> 14) & 0x03));
/* Check CD0-CD1 bits */
if ((data & 0xC000) == 0x8000)
{
@ -732,10 +736,6 @@ void vdp_68k_ctrl_w(unsigned int data)
/* Set pending flag (Mode 5 only) */
pending = reg[1] & 4;
}
/* Update address and code registers */
addr = addr_latch | (data & 0x3FFF);
code = ((code & 0x3C) | ((data >> 14) & 0x03));
}
else
{

2
core/vdp_ctrl.h
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@ -5,7 +5,7 @@
* Support for SG-1000 (TMS99xx & 315-5066), Master System (315-5124 & 315-5246), Game Gear & Mega Drive VDP
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2022 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2023 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: