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riscv-opensbi-hello
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Merge pull request #2 from OrichalcumCosmonaut/patch-2 

add clang support
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Laura Gallo 2021-07-26 08:57:54 -04:00 committed by GitHub
parent 35e3ad9304 f6dcb4315b
commit 09436f0309
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2 changed files with 26 additions and 12 deletions
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30
Makefile
View File

@ -1,16 +1,28 @@
CODE=src/
CROSS_COMPILE=riscv64-unknown-elf-
CC=$(CROSS_COMPILE)gcc
GDB=$(CROSS_COMPILE)gdb
CFLAGS=-march=rv64gc -mabi=lp64d -static -mcmodel=medany -fvisibility=hidden -nostdlib -nostartfiles -Tkernel.ld -g -Wall -Wextra
EMU=qemu-system-riscv64
EFLAGS=-machine virt -cpu rv64 -bios opensbi-riscv64-generic-fw_dynamic.bin -m 256m -nographic -global virtio-mmio.force-legacy=false -s #-S
TARGET = riscv64-unknown-elf
CC = $(TARGET)-gcc
GDB = $(TARGET)-gdb
EMU = qemu-system-riscv64
.PHONY: all clean run
CODE = src/
CFLAGS = -march=rv64gc -mabi=lp64d -static -mcmodel=medany -fvisibility=hidden -nostdlib -nostartfiles -Tkernel.ld -g -Wall -Wextra
ifeq ($(CC),clang)
CFLAGS += -target $(TARGET) -mno-relax -Wno-unused-command-line-argument
endif
EFLAGS = -machine virt -cpu rv64 -bios opensbi-riscv64-generic-fw_dynamic.bin -m 256m -nographic -global virtio-mmio.force-legacy=false -s
ifdef WAIT_GDB
EFLAGS += -S
endif
.PHONY: all clean run gdb
all: $(CODE)*.s $(CODE)*.c
$(CC) $(CFLAGS) $? -o kernel
clean:
-rm kernel
run:
$(EMU) $(EFLAGS) -kernel kernel

8
README.md
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@ -1,8 +1,10 @@
# example-os
An example bare bones OS template for RISC V.
An example bare bones OS template for RISC-V.
## Build instructions
Install [the Newlib GNU RISC V toolchain](https://github.com/riscv/riscv-gnu-toolchain#installation-newlib) and do `make` to build. Do `make run` to run. It should print out a bunch of debug information related to OpenSBI and then a single `a`.
Install [the Newlib GNU RISC-V toolchain](https://github.com/riscv/riscv-gnu-toolchain#installation-newlib) and do `make` to build. Do `make run` to run. It should print out a bunch of debug information related to OpenSBI and then a single `a`.
Alternatively, you can install Clang and use `make CC=clang`.
## Exiting QEMU
This is the new "how to exit Vi" I guess. To exit, press control+a, unpress those keys, and then press x.
@ -10,7 +12,7 @@ This is the new "how to exit Vi" I guess. To exit, press control+a, unpress thos
## Debugging
Execute `make gdb` and then `make run`.
If you'd like to trace the execution since the beginning, uncomment the `# -S` at the end of the line in the makefile and run. This halts the emulator until a gdb connection is established.
If you'd like to trace the execution since the beginning, use `make run WAIT_GDB=1`. This halts the emulator until a gdb connection is established.
## Resources
- [OpenSBI docs](https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.adoc)