common.mk

# 定义工具链的信息
CROSS_COMPILE = riscv64-unknown-elf-

# 编译器参数
# -nostdlib 不连接系统标准启动文件和标准库文件
# -fno-builtin 禁止GCC内联更有效率的代码
# -march -mabi https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/RISC-V-Options.html
# -g 生成调试信息
# -Wall 开启所有警告信息
CFLAGS = -nostdlib -fno-builtin -march=rv64g -g -Wall
# https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/RISC-V-Options.html#index-mcmodel_003dmedany
# 加入-O 结构体复制的时候不会报错 memcpy undefined 可以观察前后的objdump -S proc.o
# https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Optimize-Options.html#index-O
CFLAGS += -mcmodel=medany
CFLAGS += -O -I.

CFLAGS += -fno-omit-frame-pointer -Werror -gdwarf-2 -ffreestanding -fno-common -mno-relax
CFLAGS += -fno-stack-protector -fno-pie -no-pie

QEMU = qemu-system-riscv64
CPUS := 8

QFLAGS = -nographic -smp ${CPUS} -machine virt -bios none
QFLAGS += -global virtio-mmio.force-legacy=false
QFLAGS += -drive file=disk.img,if=none,format=raw,id=x0
QFLAGS += -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0

LDFLAGS = -z max-page-size=4096

GDB = gdb-multiarch
CC = ${CROSS_COMPILE}gcc
LD = ${CROSS_COMPILE}ld
OBJCOPY = ${CROSS_COMPILE}objcopy
OBJDUMP = ${CROSS_COMPILE}objdump

PYTHON = python3