From 721d0e5ecf522ef96aa92f6269e46c999ae781e6 Mon Sep 17 00:00:00 2001
From: Yifan Wu <shinbokuow@163.com>
Date: Wed, 11 Nov 2020 16:59:44 +0800
Subject: [PATCH] Debug using gdb on qemu.

---
 os/Makefile | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/os/Makefile b/os/Makefile
index 2982e530..6f0f525c 100644
--- a/os/Makefile
+++ b/os/Makefile
@@ -3,6 +3,7 @@ TARGET := riscv64gc-unknown-none-elf
 MODE := release
 KERNEL_ELF := target/$(TARGET)/$(MODE)/os
 KERNEL_BIN := $(KERNEL_ELF).bin
+KERNEL_ENTRY_PA := 0x80020000
 DISASM_TMP := target/$(TARGET)/$(MODE)/asm
 
 # BOARD
@@ -48,7 +49,7 @@ ifeq ($(BOARD),qemu)
 		-machine virt \
 		-nographic \
 		-bios $(BOOTLOADER) \
-		-device loader,file=$(KERNEL_BIN),addr=0x80020000
+		-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA)
 else
 	@cp $(BOOTLOADER) $(BOOTLOADER).copy
 	@dd if=$(KERNEL_BIN) of=$(BOOTLOADER).copy bs=128K seek=1
@@ -58,4 +59,10 @@ else
 	miniterm --eol LF --dtr 0 --rts 0 --filter direct $(K210-SERIALPORT) 115200
 endif
 
+debug: build
+	@tmux new-session -d \
+		"qemu-system-riscv64 -machine virt -nographic -bios $(BOOTLOADER) -device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY_PA) -s -S" && \
+		tmux split-window -h "riscv64-unknown-elf-gdb -ex 'file $(KERNEL_ELF)' -ex 'set arch riscv:rv64' -ex 'target remote localhost:1234'" && \
+		tmux -2 attach-session -d
+
 .PHONY: build kernel clean disasm disasm-vim run-inner