mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-06 23:58:04 -04:00
112 lines
5.5 KiB
Markdown
112 lines
5.5 KiB
Markdown
This is my foray into dynamic recompilation using PicoDrive, a
|
|
Megadrive / Genesis / Sega CD / Mega CD / 32X / SMS emulator.
|
|
|
|
I added support for MIPS (mips32r1) and ARM64 (aarch64) to the recompiler, as
|
|
well as spent much effort to optimize the code generated by the DRC.
|
|
I also optimized SH2 memory access inside the emulator, and did some work on
|
|
M68K/SH2 CPU synchronization to fix some problems and speed up the emulator.
|
|
|
|
It got a bit out of hand. I ended up doing fixes and optimzations all over the
|
|
place, mainly for 32X and CD, 32X graphics handling, and probably some more,
|
|
see the commit history.
|
|
|
|
### compiling
|
|
|
|
I mainly worked with standalone PicoDrive versions as created by configure/make.
|
|
A list of platforms for which this is possible can be obtained with
|
|
|
|
> configure --help
|
|
|
|
If you want to build an executable for a unixoid platform not listed in the
|
|
platform list, just use
|
|
|
|
> configure --platform=generic
|
|
|
|
If DRC is available for the platform, it should be enabled automatically.
|
|
|
|
For other platforms using a cross-compiling toolchain I used this,
|
|
assuming $TC points to the appropriate cross compile toolchain directory:
|
|
|
|
platform|toolchain|configure command
|
|
--------|---------|-----------------
|
|
gp2x,wiz,caanoo|open2x|CROSS_COMPILE=arm-open2x-linux- CFLAGS="-I$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/include -fno-stack-protector -fno-common -finline-limit=42" LDFLAGS="--sysroot $TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux -L$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/lib" ./configure --platform=gp2x
|
|
gp2x,wiz,caanoo|open2x with ubuntu arm gcc 4.7|CROSS_COMPILE=arm-linux-gnueabi- CFLAGS="-I$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/include -fno-stack-protector -fno-common -finline-limit=42 -fipa-pta" LDFLAGS="-B$TC/gcc-4.1.1-glibc-2.3.6/lib/gcc/arm-open2x-linux/4.1.1 -B$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/lib -L$TC/gcc-4.1.1-glibc-2.3.6/arm-open2x-linux/lib" ./configure --platform=gp2x
|
|
opendingux|opendingux|CROSS_COMPILE=mipsel-linux- CFLAGS="-I$TC/usr/include -I$TC/usr/include/SDL -fno-stack-protector -fno-common -finline-limit=42 -fipa-pta" LDFLAGS="--sysroot $TC -L$TC/lib" ./configure --platform=opendingux
|
|
opendingux|opendingux with ubuntu mips gcc 5.4|CROSS_COMPILE=mipsel-linux-gnu- CFLAGS="-I$TC/usr/include -I$TC/usr/include/SDL -fno-stack-protector -fno-common -finline-limit=42 -fipa-pta" LDFLAGS="-B$TC/usr/lib -B$TC/lib -Wl,-rpath-link=$TC/usr/lib -Wl,-rpath-link=$TC/lib" ./configure --platform=opendingux
|
|
gcw0|gcw0|CROSS_COMPILE=mipsel-gcw0-linux-uclibc- CFLAGS="-I$TC/usr/mipsel-gcw0-linux-uclibc/sysroot/usr/include -I$TC/usr/mipsel-gcw0-linux-uclibc/sysroot/usr/include/SDL -fno-stack-protector -fno-common -finline-limit=42 -fipa-pta" LDFLAGS="--sysroot $TC/usr/mipsel-gcw0-linux-uclibc/sysroot" ./configure --platform=gcw0
|
|
|
|
For gp2x, wiz, and caanoo you may need to compile libpng first, and additionally
|
|
this patch may need to be applied to the cpu/cyclone submodule:
|
|
> diff --git a/OpArith.cpp b/OpArith.cpp
|
|
> index 96c7e0d..09517b8 100644
|
|
> --- a/OpArith.cpp
|
|
> +++ b/OpArith.cpp
|
|
> @@ -425,7 +425,7 @@ int OpAbcd(int op)
|
|
> ot(" add r1,r1,r0\n");
|
|
> ot(" add r1,r1,r6\n");
|
|
> ot(" mov r12,r1\n");
|
|
> - ot(" addhi r12,#6 ;@ Decimal adjust units\n");
|
|
> + ot(" addhi r12,r12,#6 ;@ Decimal adjust units\n");
|
|
> ot(" tst r1,#0x80\n");
|
|
> ot(" orreq r10,r10,#0x10000000 ;@ Undefined V behavior\n");
|
|
> ot(" cmp r12,#0x9f\n");
|
|
> @@ -452,7 +452,7 @@ int OpAbcd(int op)
|
|
> ot(" cmp r1,r12\n");
|
|
> ot(" orrlt r10,r10,#0x20000000 ;@ C\n");
|
|
> ot(" cmp r1,#0xff\n");
|
|
> - ot(" addhi r1,#0xa0\n");
|
|
> + ot(" addhi r1,r1,#0xa0\n");
|
|
> ot(" sub r12,r1,r12\n");
|
|
> ot(" movs r0,r12,lsl #24\n");
|
|
> ot(" bicmi r10,r10,#0x10000000 ;@ Undefined V behavior part II\n");
|
|
> diff --git a/OpLogic.cpp b/OpLogic.cpp
|
|
> index 012e35a..d40d814 100644
|
|
> --- a/OpLogic.cpp
|
|
> +++ b/OpLogic.cpp
|
|
> @@ -74,12 +74,12 @@ const char *TestCond(int m68k_cc, int invert)
|
|
> break;
|
|
> case 0x0e: // gt
|
|
> ot(" eor r0,r10,r10,lsl #3 ;@ gt: !Z && N == V\n");
|
|
> - ot(" orrs r0,r10,lsl #1\n");
|
|
> + ot(" orrs r0,r0,r10,lsl #1\n");
|
|
> cond="pl", icond="mi";
|
|
> break;
|
|
> case 0x0f: // le
|
|
> ot(" eor r0,r10,r10,lsl #3 ;@ le: Z || N != V\n");
|
|
> - ot(" orrs r0,r10,lsl #1\n");
|
|
> + ot(" orrs r0,r0,r10,lsl #1\n");
|
|
> cond="mi", icond="pl";
|
|
> break;
|
|
> default:
|
|
|
|
After configure, compile with
|
|
|
|
> make opk # for opendingux and gcw0
|
|
>
|
|
> make # for anything else
|
|
|
|
### helix MP3 decoder
|
|
|
|
For 32 bit ARM platforms, there is the possibility to compile the helix MP3
|
|
decoder into a shared library to be able to use MP3 audio files with CD games.
|
|
The helix source files aren't supplied because of licensing issues. However, if
|
|
you have obtained the sources, put them into the platform/common/helix
|
|
directory, set CROSS to your cross compiler prefix (e.g. arm-linux-gnueabi-)
|
|
and LIBGCC to your cross compiler's libgcc.a
|
|
(e.g. /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/libgcc.a), and compile with
|
|
|
|
> make -C platform/common/helix CROSS=$CROSS LIBGCC=$LIBGCC
|
|
|
|
Copy the resulting ${CROSS}helix_mp3.so as libhelix.so to the directory where
|
|
the PicoDrive binary is.
|
|
|
|
### installing
|
|
|
|
You need to install the resulting binary onto your device manually.
|
|
For opendingux and gcw0, copy the opk to your SD card.
|
|
For gp2x, wiz and caanoo, the easiest way is to unpack
|
|
[PicoDrive_191.zip](http://notaz.gp2x.de/releases/PicoDrive/PicoDrive_191.zip)
|
|
on you SD card and replace the PicoDrive binary.
|
|
|
|
Send bug reports, fixes etc to <derkub@gmail.com>
|
|
Kai-Uwe Bloem
|