diff options
| author | Andreas Baumann <mail@andreasbaumann.cc> | 2017-05-17 18:24:59 +0200 |
|---|---|---|
| committer | Andreas Baumann <mail@andreasbaumann.cc> | 2017-05-17 18:24:59 +0200 |
| commit | 4bdc7cb8b68e3ba3aa59b7100e855febe83a5ea8 (patch) | |
| tree | f0f404f62ec3fa74badce8ed15f8f055075fa401 | |
| parent | 5585cc355659660f29cefa0d576d2356597fede7 (diff) | |
| download | abaos-4bdc7cb8b68e3ba3aa59b7100e855febe83a5ea8.tar.gz abaos-4bdc7cb8b68e3ba3aa59b7100e855febe83a5ea8.tar.bz2 | |
made debugging on C-language level possible with qemu and remote
debugging, building an ELF kernel first, then we create a flat
binary and a symbol file from it
| -rw-r--r-- | README | 8 | ||||
| -rw-r--r-- | src/Makefile | 18 |
2 files changed, 22 insertions, 4 deletions
@@ -43,6 +43,14 @@ break 0x8400 disassemble kernel in 32-bit mode ndisasm -b32 -o8400h -a kernel.bin | less +With qemu remote (see http://wiki.osdev.org/Kernel_Debugging): + +make run-qemu-debug + +gdb) target remote localhost:1234 +gdb) symbol-file kernel.sym +gdb) break entry +gdb) c links ----- diff --git a/src/Makefile b/src/Makefile index 1a4f71f..45498bb 100644 --- a/src/Makefile +++ b/src/Makefile @@ -3,7 +3,7 @@ CFLAGS := -std=c99 -m32 -ffreestanding -O0 -g -Wall -Werror LD := ld LDFLAGS := -f elf32 -all: image.bin +all: image.bin kernel.sym image.bin: boot.bin kernel.bin magic.bin cat boot.bin kernel.bin > image.tmp @@ -19,8 +19,14 @@ image.bin: boot.bin kernel.bin magic.bin boot.bin: boot.asm gdt.asm stage1_functions.asm stage2_functions.asm switch_mode.asm nasm boot.asm -f bin -o boot.bin -kernel.bin: kernel.o console.o vga.o serial.o port.o port_asm.o string.o stdlib.o - $(LD) -o kernel.bin -N -n -Ttext 0x8400 --oformat binary \ +kernel.bin: kernel.elf + objcopy -O binary kernel.elf kernel.bin + +kernel.sym: kernel.elf + objcopy --only-keep-debug kernel.elf kernel.sym + +kernel.elf: kernel.o console.o vga.o serial.o port.o port_asm.o string.o stdlib.o + $(LD) -o kernel.elf -N -n -Ttext 0x8400 --oformat elf32-i386 \ kernel.o console.o vga.o serial.o port.o port_asm.o \ string.o stdlib.o @@ -52,11 +58,15 @@ stdlib.o: stdlib.c stdlib.h $(CC) $(CFLAGS) -c -o stdlib.o stdlib.c clean: - -rm -f boot.bin kernel.bin image.bin magic.bin *.o boot.map image.tmp + -rm -f boot.bin kernel.bin kernel.sym kernel.elf image.bin magic.bin *.o boot.map image.tmp run-qemu: image.bin qemu-system-i386 -d guest_errors -m 32 -drive "file=image.bin,if=ide,format=raw" \ -serial file:serial.log +run-qemu-debug: image.bin + qemu-system-i386 -S -s -d guest_errors -m 32 -drive "file=image.bin,if=ide,format=raw" \ + -serial file:serial.log + run-bochs: bochs -q -f bochs.config 'boot:floppy' 'floppya: 1_44=image.bin, status=inserted' |