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Fixed & Improved Makefile, Made V86 GPF handler not directly dereference

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a null pointer - due to optimization breaking.
This commit is contained in:
Lucia Ceionia
2022-09-16 15:50:58 -05:00
parent 880118e7b4
commit 192d4f04ed
7 changed files with 40 additions and 33 deletions
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23
Makefile
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@@ -1,17 +1,20 @@
#TODO make the makefile use targets instead of this mess
all:
objects = entry.o kernel.o handler.o interrupt.o v86.o print.o
CFLAGS = -target "i686-elf" -m32 -ffreestanding -march=pentium-m -fno-stack-protector -nostdlib -c
%.o: %.nasm
nasm -f elf32 -o $@ $<
%.o: %.c
clang $(CFLAGS) -O2 $<
all: $(objects)
nasm boot.nasm -o boot.bin
nasm -f elf32 -o entry.o entry.nasm
nasm -f elf32 -o handler.o handler.nasm
nasm -f elf32 -o v86.o v86.nasm
clang -target "i686-elf" -ffreestanding -m32 -O2 -march=pentium-m -fno-stack-protector -nostdlib -c kernel.c
clang -target "i686-elf" -ffreestanding -m32 -O2 -mgeneral-regs-only -march=pentium-m -fno-stack-protector -nostdlib -c print.c
# not sure why but if interrupt.c has any optimization everything just breaks immediately
clang -target "i686-elf" -ffreestanding -m32 -mgeneral-regs-only -march=pentium-m -fno-stack-protector -nostdlib -c interrupt.c
#clang -target "i686-elf" -ffreestanding -m32 -mgeneral-regs-only -march=i386 -fno-stack-protector -nostdlib -c -o kernel.o kernel.c
gcc -Tlink.ld -m32 -ffreestanding -nostartfiles -nostdlib -o kernel.bin entry.o v86.o handler.o kernel.o print.o interrupt.o
gcc -Tlink.ld -m32 -ffreestanding -nostartfiles -nostdlib -o kernel.bin\
$(objects)
dd bs=256 count=1 conv=notrunc if=boot.bin of=virtdisk.bin
dd bs=512 seek=1 conv=notrunc if=kernel.bin of=virtdisk.bin
virtdisk:
dd bs=1M count=32 if=/dev/zero of=virtdisk.bin
echo -n -e '\x55\xaa' | dd bs=1 seek=510 conv=notrunc of=virtdisk.bin