mirror of
https://github.com/RaySollium99/picodrive.git
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73 lines
4.1 KiB
Markdown
73 lines
4.1 KiB
Markdown
This is my foray into dynamic recompilation using PicoDrive, a
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Megadrive / Genesis / Sega CD / Mega CD / 32X / SMS emulator.
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I added support for MIPS (mips32r1) and ARM64 (aarch64) to the recompiler, as
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well as spent much effort to optimize the code generated by the DRC.
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I also optimized SH2 memory access inside the emulator, and did some work on
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M68K/SH2 CPU synchronization to fix some problems and speed up the emulator.
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It got a bit out of hand. I ended up doing fixes and optimzations all over the
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place, mainly for 32X and CD, 32X graphics handling, and probably some more,
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see the commit history.
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### compiling
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I mainly worked with standalone PicoDrive versions as created by configure/make.
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A list of platforms for which this is possible can be obtained with
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> configure --help
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If you want to build an executable for a unixoid platform not listed in the
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platform list, just use
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> configure --platform=generic
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If DRC is available for the platform, it should be enabled automatically.
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For other platforms using a cross-compiling toolchain I used this,
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assuming $TC points to the appropriate cross compile toolchain directory:
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platform|toolchain|configure command
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--------|---------|-----------------
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gp2x,wiz,caanoo|open2x|CROSS_COMPILE=arm-open2x-linux- CFLAGS="-I$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
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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
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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
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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
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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 $TC/usr/mipsel-gcw0-linux-uclibc/sysroot" ./configure --platform=gcw0
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For gp2x, wiz, and caanoo you may need to compile libpng first, and additionally
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cyclone_gp2x.patch may need to be applied to the cpu/cyclone submodule:
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> patch -d cpu/cyclone -p1 <cyclone_gp2x.patch
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After configure, compile with
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> make opk # for opendingux and gcw0
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>
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> make # for anything else
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### helix MP3 decoder
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For 32 bit ARM platforms, there is the possibility to compile the helix MP3
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decoder into a shared library to be able to use MP3 audio files with CD games.
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The helix source files aren't supplied because of licensing issues. However, if
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you have obtained the sources, put them into the platform/common/helix
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directory, set CROSS to your cross compiler prefix (e.g. arm-linux-gnueabi-)
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and LIBGCC to your cross compiler's libgcc.a
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(e.g. /usr/lib/gcc-cross/arm-linux-gnueabi/4.7/libgcc.a), and compile with
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> make -C platform/common/helix CROSS=$CROSS LIBGCC=$LIBGCC
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Copy the resulting ${CROSS}helix_mp3.so as libhelix.so to the directory where
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the PicoDrive binary is.
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### installing
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You need to install the resulting binary onto your device manually.
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For opendingux and gcw0, copy the opk to your SD card.
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For gp2x, wiz and caanoo, the easiest way is to unpack
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[PicoDrive_191.zip](http://notaz.gp2x.de/releases/PicoDrive/PicoDrive_191.zip)
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on you SD card and replace the PicoDrive binary.
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Send bug reports, fixes etc to <derkub@gmail.com>
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Kai-Uwe Bloem
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