First step converting stm32-lcd to mmio (#97)

Switches from manually running various compilers and linkers to using
SwiftPM for most of the leg work. Additionally switches from -Osize to
-O which has notably better runtime performance.

Author: rauhul

Tools/Toolsets/stm32f74x-lcd.json

@@ -0,0 +1,25 @@
+{
+  "schemaVersion": "1.0",
+  "swiftCompiler": {
+    "extraCLIOptions": [
+      "-Xcc", "-D__APPLE__",
+      "-Xcc", "-D__MACH__",
+      "-Xfrontend", "-disable-stack-protector",
+      "-enable-experimental-feature", "Embedded"
+    ]
+  },
+  "linker": {
+    "extraCLIOptions": [
+      "-arch", "armv7em",
+      "-dead_strip",
+      "-static",
+      "-e", "_reset",
+      "-no_zero_fill_sections",
+      "-segalign", "4",
+      "-segaddr", "__VECTORS", "0x00200000",
+      "-seg1addr", "0x00200200",
+      "-pagezero_size", "0",
+      "-allow_dead_duplicates"
+    ]
+  }
+}

stm32-lcd-logo/Makefile

@@ -9,53 +9,47 @@
 ##
 ##===----------------------------------------------------------------------===##
 
-# Determine file paths
-REPOROOT := $(shell git rev-parse --show-toplevel)
-TOOLSROOT := $(REPOROOT)/Tools
-SRCROOT := $(REPOROOT)/stm32-lcd-logo
-BUILDROOT := $(SRCROOT)/.build
-
-# Setup tools and build flags
-TARGET := armv7-apple-none-macho
-BASEADDRESS := 0x00200000
-
-SWIFT_EXEC := $(shell xcrun -f swiftc)
-SWIFT_FLAGS := -target $(TARGET) -Osize -import-bridging-header $(SRCROOT)/Support/BridgingHeader.h -wmo -enable-experimental-feature Embedded -Xcc -D__APPLE__ -Xcc -D__MACH__ -Xcc -ffreestanding
-
-CLANG_EXEC := $(shell xcrun -f clang)
-CLANG_FLAGS := -target $(TARGET) -Oz
-
-LD_EXEC := $(CLANG_EXEC)
-LD_FLAGS := -target $(TARGET) -static -Wl,-e,_reset -dead_strip -Wl,-no_zero_fill_sections -Wl,-segalign,4 -Wl,-segaddr,__VECTORS,0x00200000 -Wl,-seg1addr,0x00200200 -Wl,-pagezero_size,0
-
-PYTHON_EXEC := $(shell xcrun -f python3)
-MACHO2BIN := $(TOOLSROOT)/macho2bin.py
-
-.PHONY: all
-all: $(BUILDROOT)/lcd-logo.bin
-
-$(BUILDROOT):
-	# Create build directory
-	mkdir -p $(BUILDROOT)
-
-$(BUILDROOT)/lcd-logo.o: $(SRCROOT)/Main.swift $(SRCROOT)/Support/*.swift | $(BUILDROOT)
-	# Build Swift sources
-	$(SWIFT_EXEC) $(SWIFT_FLAGS) -c $^ -o $@
-
-$(BUILDROOT)/Startup.o: $(SRCROOT)/Support/Startup.c | $(BUILDROOT)
-	# Build C sources
-	$(CLANG_EXEC) $(CLANG_FLAGS) -c $^ -o $@
-
-$(BUILDROOT)/PixelData.o: $(SRCROOT)/Support/PixelData.c | $(BUILDROOT)
-	# Build C sources
-	$(CLANG_EXEC) $(CLANG_FLAGS) -c $^ -o $@
-
-$(BUILDROOT)/lcd-logo: $(BUILDROOT)/lcd-logo.o $(BUILDROOT)/Startup.o $(BUILDROOT)/PixelData.o
-	# Link objects into executable
-	$(LD_EXEC) $(LD_FLAGS) $^ -o $@
-
-$(BUILDROOT)/lcd-logo.bin: $(BUILDROOT)/lcd-logo
-	# Extract sections from executable into flashable binary
-	$(PYTHON_EXEC) $(MACHO2BIN) $^ $@ --base-address 0x00200000 --segments '__TEXT,__DATA,__VECTORS'	
-	# Echo final binary path
-	ls -al $(BUILDROOT)/lcd-logo.bin
+# Paths
+REPOROOT         := $(shell git rev-parse --show-toplevel)
+TOOLSROOT        := $(REPOROOT)/Tools
+TOOLSET          := $(TOOLSROOT)/Toolsets/stm32f74x-lcd.json
+MACHO2BIN        := $(TOOLSROOT)/macho2bin.py
+SWIFT_BUILD      := swift build
+
+# Flags
+ARCH             := armv7em
+TARGET           := $(ARCH)-apple-none-macho
+SWIFT_BUILD_ARGS := \
+	--configuration release \
+	--triple $(TARGET) \
+	--toolset $(TOOLSET) \
+	--disable-local-rpath
+BUILDROOT        := $(shell $(SWIFT_BUILD) $(SWIFT_BUILD_ARGS) --show-bin-path)
+
+.PHONY: build
+build:
+	@echo "building..."
+	$(SWIFT_BUILD) \
+		$(SWIFT_BUILD_ARGS) \
+		-Xlinker -map -Xlinker $(BUILDROOT)/Application.mangled.map \
+		--verbose
+
+	@echo "demangling linker map..."
+	cat $(BUILDROOT)/Application.mangled.map \
+		| c++filt | swift demangle > $(BUILDROOT)/Application.map
+
+	@echo "disassembling..."
+	otool \
+		-arch $(ARCH) -v -V -d -t \
+		$(BUILDROOT)/Application \
+		| c++filt | swift demangle > $(BUILDROOT)/Application.disassembly
+
+	@echo "extracting binary..."
+	$(MACHO2BIN) \
+		$(BUILDROOT)/Application $(BUILDROOT)/Application.bin --base-address 0x00200000 --segments '__TEXT,__DATA,__VECTORS'
+
+.PHONY: clean
+clean:
+	@echo "cleaning..."
+	@swift package clean
+	@rm -rf .build

stm32-lcd-logo/Package.swift

@@ -0,0 +1,28 @@
+// swift-tools-version: 6.2
+
+import PackageDescription
+
+let package = Package(
+  name: "stm32-lcd-logo",
+  platforms: [
+    .macOS(.v10_15)
+  ],
+  products: [
+    .executable(name: "Application", targets: ["Application"])
+  ],
+  dependencies: [
+    // .package(url: "https://github.com/apple/swift-mmio", branch: "main")
+  ],
+  targets: [
+    // SVD2Swift \
+    // --input Tools/SVDs/stm32f7x6.patched.svd \
+    // --output stm32-lcd-logo/Sources/STM32F7x6 \
+    // --peripherals LTDC RCC GPIOA GPIOB GPIOC GPIOD GPIOE GPIOF GPIOG GPIOH GPIOI GPIOJ GPIOK
+    .executableTarget(
+      name: "Application",
+      dependencies: [
+        // .product(name: "MMIO", package: "swift-mmio"),
+        "Support"
+      ]),
+    .target(name: "Support"),
+  ])

stm32-lcd-logo/Support/Board.swift renamed to stm32-lcd-logo/Sources/Application/Board.swift

@@ -9,6 +9,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+import Support
+
 struct STM32F746Board {
   var led: HALGPIO<STM32F746>
 

stm32-lcd-logo/Support/GPIO.swift renamed to stm32-lcd-logo/Sources/Application/GPIO.swift

@@ -9,6 +9,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+import Support
+
 public protocol GPIOPlatform {
   associatedtype Pin
   static func configure(_ pin: Pin, _ configuration: GPIOConfiguration)

stm32-lcd-logo/Support/HAL.swift renamed to stm32-lcd-logo/Sources/Application/HAL.swift

@@ -9,6 +9,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+import Support
+
 extension UnsafeMutablePointer where Pointee == UInt32 {
   func volatileLoad() -> Pointee {
     volatile_load_uint32_t(self)

stm32-lcd-logo/Support/LTDC.swift renamed to stm32-lcd-logo/Sources/Application/LTDC.swift

@@ -25,4 +25,4 @@ static inline void nop() {
     asm volatile("nop");
 }
 
-extern uint32_t *logoPixelDataStartPointer;
+extern uint32_t const * const logoPixelDataStartPointer;