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| author | Miquel Sabaté Solà <mikisabate@gmail.com> | 2024-11-18 15:56:37 +0100 |
|---|---|---|
| committer | Miquel Sabaté Solà <mikisabate@gmail.com> | 2024-11-18 15:56:37 +0100 |
| commit | d79436a1170e4d5ffde77416313587f320c8e590 (patch) | |
| tree | cc3bc766e912f757b0244d986519cd6bb49b3bf6 /Makefile | |
| parent | 54cf703d13bddbe81e15858b1bfdb7111a3f56de (diff) | |
| download | fbos-d79436a1170e4d5ffde77416313587f320c8e590.tar.gz fbos-d79436a1170e4d5ffde77416313587f320c8e590.zip | |
usr: Bootstrap the initramfs for the kernel
Introduce a sample `foo` program which already calls the
`write_and_block` system call which is yet to be implemented by this
kernel. Moreover, the same CPIO format is used for the initramfs as with
Linux, so we can pass it with QEMU without worries.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 49 |
1 files changed, 39 insertions, 10 deletions
@@ -18,15 +18,19 @@ endif # no `-mcpu`, no `-mtune`, no funny business. CC = $(CROSS_COMPILE)gcc$(CC_SUFFIX) +AS = $(CROSS_COMPILE)as$(CC_SUFFIX) LD = $(CROSS_COMPILE)ld QEMU ?= qemu-system-riscv64 ISA ?= rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb -CCFLAGS = -march=$(ISA) -Iinclude/ -mabi=lp64d +ASFLAGS = -march=$(ISA) -mabi=lp64d +CCFLAGS = $(ASFLAGS) -Iinclude/ CCFLAGS += -Werror -Wpedantic -Wall -Wextra -Wcast-align -Wcast-qual -Winit-self \ -Wmissing-include-dirs -Wredundant-decls -Wshadow -Wsign-conversion \ - -Wswitch-default -Wundef -Wunreachable-code -Wmissing-noreturn -LDFLAGS = -Iinclude/ -static -nostdlib -melf64lriscv -z noexecstack + -Wswitch-default -Wundef -Wunreachable-code -Wmissing-noreturn \ + -nostdinc -nostdlib -std=gnu17 +LDFLAGS = -Iinclude/ -static -melf64lriscv -z noexecstack +USRFLAGS = -static -melf64lriscv ## # Optional parameters for QEMU and gdb. @@ -42,26 +46,29 @@ GDB_EXTRA_FLAGS ?= DEBUG = ifeq ($(strip $(DEBUG)),) CCFLAGS += -O3 + QEMU_FLAGS += -nographic else CCFLAGS += -g QEMU_FLAGS += -s -S endif ## -# Paths. +# Paths SRC = $(wildcard kernel/head.S kernel/*.c) OBJ = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(SRC))) LINKER = kernel/fbos.ld KRNL = fbos +USR = usr/bin/foo +INIT = usr/initramfs.cpio LDFLAGS += -T $(LINKER) ## -# Targets +# Kernel .PHONY: all -all: clean $(KRNL) +all: clean $(KRNL) usr .PHONY: $(KRNL) $(KRNL): $(OBJ) $(LINKER).S @@ -78,12 +85,34 @@ $(KRNL): $(OBJ) $(LINKER).S $(E) " CC " $(*F) $(Q) $(CC) $(CCFLAGS) -c $< -o $@ +## +# User space + +.PHONY: usr +usr: $(USR) + $(E) " CPIO " $(INIT) + $(Q) find usr/bin/ -type f -executable | cpio -o --quiet -H newc > $(INIT) + +usr/src/%.o: usr/src/%.S + $(E) " AS " $(basename $@) + $(Q) $(AS) $(ASFLAGS) -c $< -o $@ + +usr/bin/%: usr/src/%.o + $(E) " LD " $@ + $(Q) $(LD) $(USRFLAGS) $< -o $@ + +# HACK: do not remove object files from usr/src/. +.SECONDARY: + +## +# Hacking + .PHONY: qemu -qemu: $(KRNL) +qemu: $(KRNL) usr ifeq ($(strip $(QEMU_BIOS)),) - $(Q) $(QEMU) $(QEMU_FLAGS) -machine virt -kernel $(KRNL) -nographic + $(Q) $(QEMU) $(QEMU_FLAGS) -machine virt -kernel $(KRNL) -initrd $(INIT) else - $(Q) $(QEMU) $(QEMU_FLAGS) -machine virt -bios $(QEMU_BIOS) -kernel $(KRNL) -nographic + $(Q) $(QEMU) $(QEMU_FLAGS) -machine virt -bios $(QEMU_BIOS) -kernel $(KRNL) -initrd $(INIT) endif .PHONY: gdb @@ -92,7 +121,7 @@ gdb: .PHONY: clean clean: - $(Q) rm -f $(OBJ) $(KRNL) $(LINKER) + $(Q) rm -f $(OBJ) $(KRNL) $(LINKER) $(USR) usr/src/*.o $(INIT) .PHONY: lint lint: |