Initial commit

Author: vacantron

.clang-format

@@ -0,0 +1,25 @@
+BasedOnStyle: Chromium
+Language: Cpp
+MaxEmptyLinesToKeep: 3
+IndentCaseLabels: false
+AllowShortIfStatementsOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+DerivePointerAlignment: false
+PointerAlignment: Right
+SpaceAfterCStyleCast: true
+TabWidth: 4
+UseTab: Never
+IndentWidth: 4
+BreakBeforeBraces: Linux
+AccessModifierOffset: -4
+AttributeMacros:
+  - UNUSED
+  - __ALIGNED
+  - PACKED
+  - MUST_TAIL
+  - FORCE_INLINE
+StatementAttributeLikeMacros:
+  - IIF
+StatementMacros:
+  - __UNREACHABLE

.gitignore

@@ -0,0 +1 @@
+build/

.gitmodules

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+[submodule "riscv-gnu-toolchain"]
+	path = riscv-gnu-toolchain
+	url = https://github.com/riscv-collab/riscv-gnu-toolchain.git

Makefile

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+# TODO: check unsupported extensions
+RV32_EXT ?= rv32i
+OPT_LEVEL := 0 1 2
+
+CFLAGS := -std=c99
+LDFLAGS := -lsemihost -lm
+
+SRC_DIR := src
+BUILD_DIR := build
+
+SRCS := \
+  captcha.c \
+  fcalc.c \
+  mandelbrot.c \
+  nqueens.c \
+  nyancat.c \
+  pi.c \
+  puzzle.c \
+  qrcode.c \
+  richards.c \
+  spirograph.c
+
+ifneq ($(findstring f,$(RV32_EXT)),)
+  SRCS += \
+    ieee754.c
+endif
+
+EXECUTABLES := $(SRCS:%.c=%.elf)
+
+SHELL_HACK := $(shell mkdir -p $(foreach LEVEL,$(OPT_LEVEL),$(BUILD_DIR)/$(RV32_EXT)/O$(LEVEL)))
+
+.PHONY: all clean distclean build-O0 build-O1 build-O2
+
+ifneq ($(filter $(OPT_LEVEL), 0),)
+all: build-O0
+endif
+
+ifneq ($(filter $(OPT_LEVEL), 1),)
+all: build-O1
+endif
+
+ifneq ($(filter $(OPT_LEVEL), 2),)
+all: build-O2
+endif
+
+include mk/common.mk
+include mk/toolchain.mk
+
+build-O0: $(addprefix $(BUILD_DIR)/$(RV32_EXT)/O0/,$(EXECUTABLES))
+
+$(BUILD_DIR)/$(RV32_EXT)/O0/%.elf: $(SRC_DIR)/%.c | build-toolchain
+	$(VECHO) "  RISCVCC\t$@\n"
+	$(Q)$(CROSS_COMPILE) -o $@ -O0 $(CFLAGS) $< $(LDFLAGS)
+
+build-O1: $(addprefix $(BUILD_DIR)/$(RV32_EXT)/O1/,$(EXECUTABLES))
+
+$(BUILD_DIR)/$(RV32_EXT)/O1/%.elf: $(SRC_DIR)/%.c | build-toolchain
+	$(VECHO) "  RISCVCC\t$@\n"
+	$(Q)$(CROSS_COMPILE) -o $@ -O1 $(CFLAGS) $< $(LDFLAGS)
+
+build-O2: $(addprefix $(BUILD_DIR)/$(RV32_EXT)/O2/,$(EXECUTABLES))
+
+$(BUILD_DIR)/$(RV32_EXT)/O2/%.elf: $(SRC_DIR)/%.c | build-toolchain
+	$(VECHO) "  RISCVCC\t$@\n"
+	$(Q)$(CROSS_COMPILE) -o $@ -O2 $(CFLAGS) $< $(LDFLAGS)
+
+clean:
+	$(RM) -r $(BUILD_DIR)/$(RV32_EXT)/*
+
+distclean: clean
+	$(RM) -r $(BUILD_DIR)/*
+	$(RM) -r $(RISCV_TOOLCHAIN_DIR)/build/*
+	$(MAKE) -C $(RISCV_TOOLCHAIN_DIR) distclean

mk/common.mk

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+ifeq ($(shell uname -s),Darwin)
+  PRINTF = printf
+else
+  PRINTF = env printf
+endif
+
+ifeq ("$(VERBOSE)","1")
+    Q :=
+    VECHO = @true
+    REDIR =
+else
+    Q := @
+    VECHO = @$(PRINTF)
+    REDIR = >/dev/null
+endif

mk/toolchain.mk

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+RV32_PREFIX := riscv32-unknown-elf-
+
+RISCV_TOOLCHAIN_DIR := riscv-gnu-toolchain
+SHELL_HACK := $(shell mkdir -p $(RISCV_TOOLCHAIN_DIR)/build/$(RV32_EXT))
+
+CROSS_COMPILE := $(shell find $(RISCV_TOOLCHAIN_DIR)/build/$(RV32_EXT) -name $(RV32_PREFIX)gcc)
+
+.PHONY: build-toolchain
+
+build-toolchain:
+  ifeq ($(CROSS_COMPILE),)
+	git submodule update --init $(RISCV_TOOLCHAIN_DIR)
+	cd $(RISCV_TOOLCHAIN_DIR) && ./configure \
+      --prefix=$(shell pwd)/$(RISCV_TOOLCHAIN_DIR)/build/$(RV32_EXT) \
+      --with-arch=$(RV32_EXT) \
+      --with-abi=ilp32 \
+      --disable-gdb
+	$(MAKE) -C $(RISCV_TOOLCHAIN_DIR) clean all
+  endif

riscv-gnu-toolchain

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+include ../../mk/toolchain.mk
+
+ASFLAGS := -march=rv32i -mabi=ilp32
+LDFLAGS := --oformat=elf32-littleriscv
+
+.PHONY: all clean
+
+%.o: %.S
+	$(CROSS_COMPILE)as -R $(ASFLAGS) -o $@ $<
+
+all: hello.elf
+
+hello.elf: hello.o
+	 $(CROSS_COMPILE)ld -o $@ -T hello.ld $(LDFLAGS) $<
+
+clean:
+	$(RM) hello.elf hello.o

src/asm-hello/Makefile

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+# RISC-V assembly program to print "Hello World!" to stdout.
+
+.org 0
+# Provide program starting address to linker
+.global _start
+
+/* newlib system calls */
+.set SYSEXIT,  93
+.set SYSWRITE, 64
+
+.section .rodata
+str: .ascii "Hello World!\n"
+     .set str_size, .-str
+
+.text
+_start:
+    li t0, 0
+    li t1, 5
+
+    # dummy test for jal instruction
+.L1:
+    jal x0, .L2
+.L2:
+    nop
+
+loop:
+    beq t0, t1, end
+
+    li a7, SYSWRITE     # "write" syscall
+    li a0, 1            # 1 = standard output (stdout)
+    la a1, str          # load address of hello string
+    li a2, str_size     # length of hello string
+    ecall               # invoke syscall to print the string
+    addi t0, t0, 1
+    j loop
+
+end:
+    li a7, SYSEXIT      # "exit" syscall
+    add a0, x0, 0       # Use 0 return code
+    ecall               # invoke syscall to terminate the program

src/asm-hello/hello.S

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+OUTPUT_ARCH("riscv")
+ENTRY(_start)
+
+SECTIONS
+{
+    . = 0x0;
+}