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tinygo/targets/gameboy-advance.json

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targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
{
gba: always use ARM mode instead of Thumb mode This results in bigger code size, but it works around a bug in the linker. The issue starts with the problem that libraries (picolibc, compiler-rt) were compiled as ARM and the rest as Thumb. This causes some blx instructions to be inserted by the linker to call into these libraries. Ideally we should fix the libraries to use Thumb mode instead, but that requires some more extensive changes (including fixes to compiler-rt) and it's just way easier to use ARM mode everywhere.
5 years ago
"llvm-target": "arm4-none-eabi",
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
"cpu": "arm7tdmi",
"build-tags": ["gameboyadvance", "arm7tdmi", "baremetal", "linux", "arm"],
"goos": "linux",
"goarch": "arm",
"compiler": "clang",
"linker": "ld.lld",
gameboy-advance: include compiler-rt in build This avoids errors like the following: ld.lld-9: error: undefined symbol: __umodsi3 ld.lld-9: error: undefined symbol: __aeabi_uidivmod
5 years ago
"rtlib": "compiler-rt",
all: include picolibc for bare metal targets This is necessary for better CGo support on bare metal. Existing libraries expect to be able to include parts of libc and expect to be able to link to those symbols. Because with this all targets have a working libc, it is now possible to add tests to check that a libc in fact works basically. Not all parts of picolibc are included, such as the math or stdio parts. These should be added later, when needed. This commit also avoids the need for the custom memcpy/memset/memcmp symbols that are sometimes emitted by LLVM. The C library will take care of that.
5 years ago
"libc": "picolibc",
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
"cflags": [
gba: always use ARM mode instead of Thumb mode This results in bigger code size, but it works around a bug in the linker. The issue starts with the problem that libraries (picolibc, compiler-rt) were compiled as ARM and the rest as Thumb. This causes some blx instructions to be inserted by the linker to call into these libraries. Ideally we should fix the libraries to use Thumb mode instead, but that requires some more extensive changes (including fixes to compiler-rt) and it's just way easier to use ARM mode everywhere.
5 years ago
"--target=arm4-none-eabi",
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
"-mcpu=arm7tdmi",
"-Oz",
"-Werror",
"-fshort-enums",
arm: use -fomit-frame-pointer The frame pointer was already omitted in the object files that TinyGo emits, but wasn't yet omitted in the C files it compiles. Omitting the frame pointer is good for code size (and perhaps performance). The frame pointer was originally used for printing stack traces in a debugger. However, advances in DWARF debug info have made it largely unnecessary (debug info contains enough information now to recover the frame pointer even without an explicit frame pointer register). In fact, GDB has been able to produce backtraces in TinyGo compiled code for a while now while it didn't include a frame pointer.
5 years ago
"-fomit-frame-pointer",
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
"-Qunused-arguments",
"-fno-exceptions", "-fno-unwind-tables",
"-ffunction-sections", "-fdata-sections"
],
"ldflags": [
compileopts: add linkerscript key Setting the linker script as one property (instead of as part of the generic ldflags property) allows it to be overriden. This is important for the SoftDevice on Nordic chips, because the SoftDevice takes up a fixed part of the flash/RAM and the application must be flashed at a different position. With this linkerscript option, it is possible to create (for example) a pca10040-s132v6 that overrides the default linker script.
5 years ago
"--gc-sections"
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
],
compileopts: add linkerscript key Setting the linker script as one property (instead of as part of the generic ldflags property) allows it to be overriden. This is important for the SoftDevice on Nordic chips, because the SoftDevice takes up a fixed part of the flash/RAM and the application must be flashed at a different position. With this linkerscript option, it is possible to create (for example) a pca10040-s132v6 that overrides the default linker script.
5 years ago
"linkerscript": "targets/gameboy-advance.ld",
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
"extra-files": [
runtime: copy stack scan assembly for GBA The GC stack scanning code was implemented in the Cortex-M assembly, which meant that it was not available on the GBA which is pre-cortex. This change adds a copy of the relevant code into a new asembly file which is used on the GBA.
5 years ago
"targets/gameboy-advance.s",
runtime: move/refactor some GC-related code Instead of putting tinygo_scanCurrentStack in scheduler_*.S files, put them in dedicated files. The function tinygo_scanCurrentStack has nothing to do with scheduling and so doesn't belong there. Additionally, while scheduling code is made specific for the Cortex-M, the tinygo_scanCurrentStack is generic to all ARM targets so this move removes some duplication there. Specifically: * tinygo_scanCurrentStack is moved out of scheduler_cortexm.S as it isn't really part of the scheduler. It is now gc_arm.S. * Same for the AVR target. * Same for the RISCV target. * scheduler_gba.S is removed, using gc_arm.S instead as it only contains tinygo_scanCurrentStack.
4 years ago
"src/runtime/gc_arm.S"
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
],
gameboy-advance: enable debugging with GDB
5 years ago
"gdb": "gdb-multiarch",
"emulator": ["mgba", "-3"]
targets: add support for GameBoy Advance Only tested in an emulator (mGBA). Almost nothing is supported, but drawing to the screen works.
5 years ago
}