WIP: Llvm mos

Makefile

@@ -228,6 +228,10 @@ gen-device-stm32: build/gen-device-svd
  ./build/gen-device-svd -source=https://github.com/tinygo-org/stm32-svd lib/stm32-svd/svd src/device/stm32/
  GO111MODULE=off $(GO) fmt ./src/device/stm32
 
+gen-device-6502: build/gen-device-svd
+ ./build/gen-device-svd lib/cmsis-svd/data/MOS src/device/mos/
+ GO111MODULE=off $(GO) fmt ./src/device/mos
+
 gen-device-rp: build/gen-device-svd
  ./build/gen-device-svd -source=https://github.com/posborne/cmsis-svd/tree/master/data/RaspberryPi lib/cmsis-svd/data/RaspberryPi/ src/device/rp/
  GO111MODULE=off $(GO) fmt ./src/device/rp
@@ -238,13 +242,13 @@ gen-device-renesas: build/gen-device-svd
 
 # Get LLVM sources.
 $(LLVM_PROJECTDIR)/llvm:
- git clone -b xtensa_release_16.x --depth=1 https://github.com/espressif/llvm-project $(LLVM_PROJECTDIR)
+ git clone --depth=1 https://github.com/llvm-mos/llvm-mos $(LLVM_PROJECTDIR) && cd $(LLVM_PROJECTDIR) && git checkout a6f990e5ae4e6e287997ee71928ea65b99a40fe0 && cd ..
 llvm-source: $(LLVM_PROJECTDIR)/llvm
 
 # Configure LLVM.
 TINYGO_SOURCE_DIR=$(shell pwd)
 $(LLVM_BUILDDIR)/build.ninja:
- mkdir -p $(LLVM_BUILDDIR) && cd $(LLVM_BUILDDIR) && cmake -G Ninja $(TINYGO_SOURCE_DIR)/$(LLVM_PROJECTDIR)/llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;RISCV;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR;Xtensa" -DCMAKE_BUILD_TYPE=Release -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_ZSTD=OFF -DLLVM_ENABLE_LIBEDIT=OFF -DLLVM_ENABLE_Z3_SOLVER=OFF -DLLVM_ENABLE_OCAMLDOC=OFF -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF -DCLANG_ENABLE_STATIC_ANALYZER=OFF -DCLANG_ENABLE_ARCMT=OFF $(LLVM_OPTION)
+ mkdir -p $(LLVM_BUILDDIR) && cd $(LLVM_BUILDDIR) && cmake -G Ninja $(TINYGO_SOURCE_DIR)/$(LLVM_PROJECTDIR)/llvm "-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64;RISCV;WebAssembly" "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=MOS" -DCMAKE_BUILD_TYPE=Release -DLIBCLANG_BUILD_STATIC=ON -DLLVM_ENABLE_TERMINFO=OFF -DLLVM_ENABLE_ZLIB=OFF -DLLVM_ENABLE_ZSTD=OFF -DLLVM_ENABLE_LIBEDIT=OFF -DLLVM_ENABLE_Z3_SOLVER=OFF -DLLVM_ENABLE_OCAMLDOC=OFF -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=OFF -DCLANG_ENABLE_STATIC_ANALYZER=OFF -DCLANG_ENABLE_ARCMT=OFF $(LLVM_OPTION)
 
 # Build LLVM.
 $(LLVM_BUILDDIR): $(LLVM_BUILDDIR)/build.ninja

src/device/mos/c64.go

@@ -0,0 +1,104 @@
+// Automatically generated file. DO NOT EDIT.
+// Generated by gen-device-svd.go from 6502.svd, see <unknown>
+
+//go:build mos && c64
+
+//
+//
+
+package mos
+
+import (
+ "runtime/volatile"
+ "unsafe"
+)
+
+// Some information about this device.
+const (
+ Device = "C64"
+)
+
+// Interrupt numbers.
+const (
+ // Highest interrupt number on this device.
+ IRQ_max = 0
+)
+
+// Pseudo function call that is replaced by the compiler with the actual
+// functions registered through interrupt.New.
+//
+//go:linkname callHandlers runtime/interrupt.callHandlers
+func callHandlers(num int)
+
+// Peripherals.
+var (
+ // MOS 6510 Processor
+ CPU = (*CPU_Type)(unsafe.Pointer(uintptr(0x1)))
+
+ // Video Interface Chip
+ VICII = (*VICII_Type)(unsafe.Pointer(uintptr(0xd000)))
+
+ // Sound Interface Device
+ SID = (*SID_Type)(unsafe.Pointer(uintptr(0xd400)))
+
+ // Complex Interface Adapter 1
+ CIA1 = (*CIA1_Type)(unsafe.Pointer(uintptr(0xdc00)))
+
+ // Complex Interface Adapter 2
+ CIA2 = (*CIA2_Type)(unsafe.Pointer(uintptr(0xdd00)))
+
+ // Main Memory
+ Memory = (*Memory_Type)(unsafe.Pointer(uintptr(0x0)))
+)
+
+// MOS 6510 Processor
+type CPU_Type struct {
+ _ byte
+ CPU_PORT volatile.Register8 // 0x1
+}
+
+// Video Interface Chip
+type VICII_Type struct {
+ VIC volatile.Register8 // 0x0
+}
+
+// Sound Interface Device
+type SID_Type struct {
+ SID volatile.Register8 // 0x0
+}
+
+// Complex Interface Adapter 1
+type CIA1_Type struct {
+ _ [14]byte
+ CIA1ControlA volatile.Register8 // 0xE
+}
+
+// Complex Interface Adapter 2
+type CIA2_Type struct {
+}
+
+// Main Memory
+type Memory_Type struct {
+ _ [1024]byte
+ DEFAULT_VIDEO_MEMORY volatile.Register8 // 0x400
+ _ [54271]byte
+ COLOR_RAM volatile.Register8 // 0xD800
+}
+
+// Constants for CPU: MOS 6510 Processor
+const ()
+
+// Constants for VICII: Video Interface Chip
+const ()
+
+// Constants for SID: Sound Interface Device
+const ()
+
+// Constants for CIA1: Complex Interface Adapter 1
+const ()
+
+// Constants for CIA2: Complex Interface Adapter 2
+const ()
+
+// Constants for Memory: Main Memory
+const ()

src/device/mos/c64.s

@@ -0,0 +1,65 @@
+// Automatically generated file. DO NOT EDIT.
+// Generated by gen-device-svd.go from 6502.svd, see <unknown>
+
+// 
+//
+
+
+.syntax unified
+
+// This is the default handler for interrupts, if triggered but not defined.
+.section .text.Default_Handler
+.global Default_Handler
+.type Default_Handler, %function
+Default_Handler:
+ wfe
+ b Default_Handler
+.size Default_Handler, .-Default_Handler
+
+// Avoid the need for repeated .weak and .set instructions.
+.macro IRQ handler
+ .weak \handler
+ .set \handler, Default_Handler
+.endm
+
+// Must set the "a" flag on the section:
+// https://svnweb.freebsd.org/base/stable/11/sys/arm/arm/locore-v4.S?r1=321049&r2=321048&pathrev=321049
+// https://sourceware.org/binutils/docs/as/Section.html#ELF-Version
+.section .isr_vector, "a", %progbits
+.global __isr_vector
+__isr_vector:
+ // Interrupt vector as defined by Cortex-M, starting with the stack top.
+ // On reset, SP is initialized with *0x0 and PC is loaded with *0x4, loading
+ // _stack_top and Reset_Handler.
+ .long _stack_top
+ .long Reset_Handler
+ .long NMI_Handler
+ .long HardFault_Handler
+ .long MemoryManagement_Handler
+ .long BusFault_Handler
+ .long UsageFault_Handler
+ .long 0
+ .long 0
+ .long 0
+ .long 0
+ .long SVC_Handler
+ .long DebugMon_Handler
+ .long 0
+ .long PendSV_Handler
+ .long SysTick_Handler
+
+ // Extra interrupts for peripherals defined by the hardware vendor.
+
+ // Define default implementations for interrupts, redirecting to
+ // Default_Handler when not implemented.
+ IRQ NMI_Handler
+ IRQ HardFault_Handler
+ IRQ MemoryManagement_Handler
+ IRQ BusFault_Handler
+ IRQ UsageFault_Handler
+ IRQ SVC_Handler
+ IRQ DebugMon_Handler
+ IRQ PendSV_Handler
+ IRQ SysTick_Handler
+
+.size __isr_vector, .-__isr_vector

src/machine/machine_6502.go

@@ -0,0 +1,10 @@
+//go:build cortexm
+
+package machine
+
+import "device/mos"
+
+// CPUReset performs a hard system reset.
+func CPUReset() {
+ mos.Device()
+}

src/runtime/arch_mos.go

@@ -0,0 +1,8 @@
+//go:build tinygo.mos
+
+package runtime
+
+const GOARCH = "mos" // riscv pretends to be arm
+
+// The bitness of the CPU (e.g. 8, 32, 64).
+const TargetBits = 8

src/runtime/interrupt/interrupt_6502.go

@@ -0,0 +1,31 @@
+//go:build mos
+
+package interrupt
+
+// State represents the previous global interrupt state.
+type State uintptr
+
+// Disable disables all interrupts and returns the previous interrupt state. It
+// can be used in a critical section like this:
+//
+// state := interrupt.Disable()
+// // critical section
+// interrupt.Restore(state)
+//
+// Critical sections can be nested. Make sure to call Restore in the same order
+// as you called Disable (this happens naturally with the pattern above).
+func Disable() (state State) {
+ return 0
+}
+
+// Restore restores interrupts to what they were before. Give the previous state
+// returned by Disable as a parameter. If interrupts were disabled before
+// calling Disable, this will not re-enable interrupts, allowing for nested
+// cricital sections.
+func Restore(state State) {}
+
+// In returns whether the system is currently in an interrupt.
+func In() bool {
+ // There are no interrupts, so it can't be in one.
+ return false
+}

src/runtime/runtime_6502.go

@@ -0,0 +1,44 @@
+//go:build 6502
+
+package runtime
+
+// timeUnit in nanoseconds
+type timeUnit int64
+
+func putchar(c byte) {
+}
+
+func getchar() byte {
+ // dummy, TODO
+ return 0
+}
+
+func buffered() int {
+ // dummy, TODO
+ return 0
+}
+
+func ticks() timeUnit {
+ return 0
+}
+
+func sleepTicks(d timeUnit) {
+ return
+}
+
+func ticksToNanoseconds(ticks timeUnit) int64 {
+ return 0
+}
+
+func nanosecondsToTicks(ns int64) timeUnit {
+ return 0
+}
+func exit(code int) {
+ abort()
+}
+
+func abort() {
+ // TODO
+ for {
+ }
+}

targets/6502.json

@@ -0,0 +1,10 @@
+{
+ "llvm-target": "mos",
+ "build-tags": ["mos", "baremetal", "6502", "linux"],
+ "goos": "linux",
+ "linker": "ld.lld",
+ "gc": "conservative",
+ "cflags": [
+ "-Werror"
+ ]
+}