ENTRY(_loadkernel)
SECTIONS {
. = 1M;
.boot : ALIGN(4) {
*(.multiboot)
}
.text : ALIGN(4) {
*(.text)
}
.data : ALIGN(4) {
*(.data)
}
.bss : ALIGN(4) {
*(.bss)
}
}MAGIC equ 0x1BADB002
MEMINFO equ 1<<1
MBALIGN equ 1<<0
FLAGS equ 0 | MBALIGN | MEMINFO
STACK_SIZE equ 600
bits 32
section .bss
align 4
stack_end:
resb STACK_SIZE
stack_top:
section .multiboot
align 4
grubBoot:
dd MAGIC
dd FLAGS
; dd 0
dd (end_grubBoot - grubBoot)
dd -(MAGIC + FLAGS + (end_grubBoot - grubBoot))
; dd -(MAGIC + 0 + (end_grubBoot - grubBoot))
; dw 0
; dw FLAGS
; dd 8
end_grubBoot:
section .text
align 4
global _loadkernel
extern __kmain
_loadkernel:
finit
mov esp,stack_top
push ebx
push eax
call __kmain
cli
hltvoid print_str(char* str) {
unsigned short* videoMemory = (unsigned short*)0xb8000;
for (int i = 0; i < str[i] != '\0'; i++) {
videoMemory[i] = (videoMemory[i] & 0xFF00) | str[i];
}
}
void _kmain(int magic,void *boot_ptr) {
print_str("hello world!");
while(1) {}
}CC=gcc
LD=ld
ASM=nasm -f elf32
CSTD=11
CEMU=-m32
LDEMU=-mi386pe # elf_i386
LDFILE=link.ld
OUTBIN=kernel
CSOURCES ?=
ASMSOURCES ?=
NASMSOURCES ?=
CSOURCES += $(shell find . -name "*.c" -type f -print )
ASMSOURCES += $(shell find . -name "*.s" -type f -print )
NASMSOURCES += $(shell find . -name "*.asm" -type f -print )
all: build test
build: kernel img iso
kernel:
$(CC) $(CEMU) -std=c$(CSTD) -c $(CSOURCES) -ffreestanding -nostdlib -nostdinc -fno-pic
$(ASM) $(NASMSOURCES)
mv *.o build/
$(LD) $(LDEMU) --nmagic -T$(LDFILE) -o build/$(OUTBIN).bin build/*.o
objcopy -O elf32-i386 build/$(OUTBIN).bin $(OUTBIN)
img:
iso:
hex_info:
@echo --HEX INFO--
@echo loader hex info
hexdump -x build/loader.o
@echo kernel hex info
hexdump -x $(OUTBIN)
# dis_asm:
# @echo --DIS ASM--
# @echo loader disasm
# ndisasm -b 32 build/loader.o
# @echo kernel disasm
# ndisasm -b 32 $(OUTBIN)
obj_info:
@echo --OBJ INFO--
@echo loader obj info
objdump -f -h build/loader.o
@echo kernel obj info
objdump -f -h $(OUTBIN)
info: hex_info obj_info # dis_asm
test:
qemu-system-i386 -nographic -kernel $(OUTBIN)
clean: kmain.o $(OUTBIN)
rm build/*.o
rm build/*.bin
rm $(OUTBIN)
пытаюсь понять, почему qemu не хочет запускать ядро....
MAGIC equ 0x1BADB002
...
grubBoot:
dd MAGIC
dd FLAGS
; dd 0
dd (end_grubBoot - grubBoot)
dd -(MAGIC + FLAGS + (end_grubBoot - grubBoot))
; dd -(MAGIC + 0 + (end_grubBoot - grubBoot))
; dw 0
; dw FLAGS
; dd 8
end_grubBoot:MAGIC equ 0x1BADB002
dd MAGIC
dd FLAGS
dd -(MAGIC + FLAGS)...
Trace 0: 0x7f2a71e084c0 [00000000/000caa1a/0xb0]
----------------
IN:
0x00102060: 9b wait
0x00102061: db e3 fninit
0x00102063: bc 44 23 10 00 movl $0x102344, %esp
0x00102068: 53 pushl %ebx
0x00102069: 50 pushl %eax
0x0010206a: e8 68 00 00 00 calll 0x1020d7
Trace 0: 0x7f2a71e08800 [00000000/00102060/0xb0]
----------------
IN:
0x001020d7: 55 pushl %ebp
0x001020d8: 89 e5 movl %esp, %ebp
0x001020da: 68 00 10 10 00 pushl $0x101000
0x001020df: e8 8d ff ff ff calll 0x102071
Linking TBs 0x7f2a71e08800 [00102060] index 0 -> 0x7f2a71e08a40 [001020d7]
Trace 0: 0x7f2a71e08a40 [00000000/001020d7/0xb0]
----------------
IN:
0x00102071: 55 pushl %ebp
0x00102072: 89 e5 movl %esp, %ebp
0x00102074: 53 pushl %ebx
0x00102075: 83 ec 10 subl $0x10, %esp
0x00102078: c7 45 f4 00 80 0b 00 movl $0xb8000, -0xc(%ebp)
0x0010207f: c7 45 f8 00 00 00 00 movl $0, -8(%ebp)
0x00102086: eb 35 jmp 0x1020bd
Linking TBs 0x7f2a71e08a40 [001020d7] index 0 -> 0x7f2a71e08c80 [00102071]
Trace 0: 0x7f2a71e08c80 [00000000/00102071/0xb0]
----------------
IN:
0x001020bd: 8b 55 f8 movl -8(%ebp), %edx
0x001020c0: 8b 45 08 movl 8(%ebp), %eax
0x001020c3: 01 d0 addl %edx, %eax
0x001020c5: 0f b6 00 movzbl (%eax), %eax
0x001020c8: 0f be c0 movsbl %al, %eax
0x001020cb: 3b 45 f8 cmpl -8(%ebp), %eax
0x001020ce: 7f b8 jg 0x102088
Linking TBs 0x7f2a71e08c80 [00102071] index 0 -> 0x7f2a71e08f00 [001020bd]
Trace 0: 0x7f2a71e08f00 [00000000/001020bd/0xb0]
----------------
IN:
0x00102088: 8b 45 f8 movl -8(%ebp), %eax
0x0010208b: 8d 14 00 leal (%eax, %eax), %edx
0x0010208e: 8b 45 f4 movl -0xc(%ebp), %eax
0x00102091: 01 d0 addl %edx, %eax
0x00102093: 8b 55 f8 movl -8(%ebp), %edx
0x00102096: 8d 0c 12 leal (%edx, %edx), %ecx
0x00102099: 8b 55 f4 movl -0xc(%ebp), %edx
0x0010209c: 01 ca addl %ecx, %edx
0x0010209e: 0f b7 12 movzwl (%edx), %edx
0x001020a1: 89 d3 movl %edx, %ebx
0x001020a3: b3 00 movb $0, %bl
0x001020a5: 8b 4d f8 movl -8(%ebp), %ecx
0x001020a8: 8b 55 08 movl 8(%ebp), %edx
0x001020ab: 01 ca addl %ecx, %edx
0x001020ad: 0f b6 12 movzbl (%edx), %edx
0x001020b0: 66 0f be d2 movsbw %dl, %dx
0x001020b4: 09 da orl %ebx, %edx
0x001020b6: 66 89 10 movw %dx, (%eax)
0x001020b9: 83 45 f8 01 addl $1, -8(%ebp)
0x001020bd: 8b 55 f8 movl -8(%ebp), %edx
0x001020c0: 8b 45 08 movl 8(%ebp), %eax
0x001020c3: 01 d0 addl %edx, %eax
0x001020c5: 0f b6 00 movzbl (%eax), %eax
0x001020c8: 0f be c0 movsbl %al, %eax
0x001020cb: 3b 45 f8 cmpl -8(%ebp), %eax
0x001020ce: 7f b8 jg 0x102088
Linking TBs 0x7f2a71e08f00 [001020bd] index 1 -> 0x7f2a71e091c0 [00102088]
Trace 0: 0x7f2a71e091c0 [00000000/00102088/0xb0]
Linking TBs 0x7f2a71e091c0 [00102088] index 1 -> 0x7f2a71e091c0 [00102088]
Trace 0: 0x7f2a71e091c0 [00000000/00102088/0xb0]
----------------
IN:
0x001020d0: 90 nop
0x001020d1: 83 c4 10 addl $0x10, %esp
0x001020d4: 5b popl %ebx
0x001020d5: 5d popl %ebp
0x001020d6: c3 retl
Linking TBs 0x7f2a71e091c0 [00102088] index 0 -> 0x7f2a71e098c0 [001020d0]
Trace 0: 0x7f2a71e098c0 [00000000/001020d0/0xb0]
----------------
IN:
0x001020e4: 83 c4 04 addl $4, %esp
0x001020e7: eb fe jmp 0x1020e7
Trace 0: 0x7f2a71e09b00 [00000000/001020e4/0xb0]
----------------
IN:
0x001020e7: eb fe jmp 0x1020e7
Linking TBs 0x7f2a71e09b00 [001020e4] index 0 -> 0x7f2a71e09c40 [001020e7]
Trace 0: 0x7f2a71e09c40 [00000000/001020e7/0xb0]
Linking TBs 0x7f2a71e09c40 [001020e7] index 0 -> 0x7f2a71e09c40 [001020e7]
...LDEMU=-melf_i386
kernel: $(CSOURCES) $(NASMSOURCES) $(LDFILE)
$(CC) $(CEMU) -std=c$(CSTD) -c $(CSOURCES) -ffreestanding -nostdlib -nostdinc -fno-pic
$(ASM) $(NASMSOURCES)
$(LD) $(LDEMU) --nmagic -T$(LDFILE) -o kernel *.o
Простой
