Added GDB debug commands in Makefile and RAEDME.md

Author: scopeInfinity

.travis.yml

@@ -18,13 +18,14 @@ script:
 before_deploy:
   - git config --local user.name "scopeinfinity"
   - git config --local user.email "[email protected]"
-  - git tag "latest"
+  - git tag -f "latest"
 
 deploy:
   provider: releases
   api_key:
     secure: "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"
   file: "build/image.vmdk"
+  overwrite: true
   skip_cleanup: true
   on:
     tags: false

Makefile

@@ -2,6 +2,7 @@ BUILD_DIR = build
 SRC_DIR = src
 QEMU_SHUT_FLAGS= -no-shutdown -no-reboot
 QEMU_EXTRA_FLAGS=
+QEMU_GDB_PORT=9000
 
 SRC_BOOTLOADER = $(SRC_DIR)/bootloader
 SRC_KERNEL = $(SRC_DIR)/kernel
@@ -132,11 +133,14 @@ debug_kernel: $(kernel_core)
 qemu: $(image_vmdk)
 	qemu-system-x86_64 -smp 1 -m 128M -hda $< $(QEMU_SHUT_FLAGS) $(QEMU_EXTRA_FLAGS)
 
-qemu_debug: $(image_vmdk)
+qemu_vvv: $(image_vmdk)
 	qemu-system-x86_64 -smp 1 -m 128M -hda $< $(QEMU_SHUT_FLAGS) -d  cpu,exec,in_asm
 
-qemu_xdebug: $(image_vmdk)
-	qemu-system-x86_64 -S -gdb tcp::9000 -smp 1 -m 128M -hda $< $(QEMU_SHUT_FLAGS) -d  cpu,exec,in_asm
+qemu_debug: $(image_vmdk)
+	qemu-system-x86_64 -S -gdb tcp::$(QEMU_GDB_PORT) -smp 1 -m 128M -hda $< $(QEMU_SHUT_FLAGS) -d  cpu,exec,in_asm
+
+qemu_debug_connect:
+	gdb -ex "target remote :$(QEMU_GDB_PORT)"
 
 clean:
 	rm -r $(BUILD_DIR)/ || echo "Build directory is clean."

README.md

@@ -31,3 +31,13 @@ bash before_install.sh
 ###### Issues on booting from the Flash Drive
 - Try formatting device MBR with a FAT partition.
 - And then burn it again with test image.
+
+#### Development
+
+##### Debug
+
+Execute QEMU in debug mode and setup GDB server.
+ - `make qemu_debug`
+
+And then connect to GDB Server.
+ - `make qemu_debug_connect`

before_install.sh

@@ -1,2 +1,2 @@
 #!/bin/bash
-apt install -y make nasm gcc cpulimit qemu-system-x86 gocr expect
+apt install -y make nasm gcc cpulimit qemu-system-x86 gocr expect gdb