grub can't load my kernel
Posted: Sun Aug 01, 2004 4:25 am
Hi, i try to load my kernel with grub but i get the following screen:
grub> kernel (fd0)/kernel
[FreeBSD-a.out, loadaddr=0x100000, text=0x2000, data=0x1000
Error 13: Invalid or unsupported executable format
grub>
what's happend?
My linker skript:
my _start.asm:
my main.c:
I build the files with DJGPP and NASM:
nasm -f aout _start.asm -o kernel.o
gcc -fno-builtin -c -O3 main.c
ld -T link.ld *.o -o kernel
grub> kernel (fd0)/kernel
[FreeBSD-a.out, loadaddr=0x100000, text=0x2000, data=0x1000
Error 13: Invalid or unsupported executable format
grub>
what's happend?
My linker skript:
Code: Select all
/* Link.ld */
OUTPUT_FORMAT("a.out-i386")
ENTRY(start)
SECTIONS
{
.text 0x100000 :
{
code = .; _code = .; __code = .;
*(.text)
. = ALIGN(4096);
}
.data :
{
__CTOR_LIST__ = .; LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) *(.ctors) LONG(0) __CTOR_END__ = .;
__DTOR_LIST__ = .; LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) *(.dtors) LONG(0) __DTOR_END__ = .;
data = .; _data = .; __data = .;
*(.data)
. = ALIGN(4096);
}
.bss :
{
bss = .; _bss = .; __bss = .;
*(.bss)
. = ALIGN(4096);
}
end = .; _end = .; __end = .;
}
Code: Select all
[BITS 32]
[GLOBAL start]
[EXTERN _main]
start:
jmp start2
multiboot_header:
magic dd 0x1BADB002
flags_0..15 dw 0 ; requirements
flags_16.32 dw 0 ; optional futures
checksum dd 0 - 0x1BADB002
start2:
mov [0xB8000], byte 't'
mov [0xB8001], byte 5
cli
hlt
jmp $-2
Code: Select all
int main()
{
return 0;
}
nasm -f aout _start.asm -o kernel.o
gcc -fno-builtin -c -O3 main.c
ld -T link.ld *.o -o kernel