I have the following problem, when I try to link my kernel with LD it gives the following error:
stub.o(.text+0x60):stub.o: relocation truncated to fit: 16 .text
Here is my code:
Code: Select all
;-----------------------------------------------------------------------------
; File: stub.asm
;
; Desc: This is the 16-bit entrypoint of the kernel
;-----------------------------------------------------------------------------
; Globals
;-----------------------------------------------------------------------------
[global load]
[global _header]
[global _export_header]
[global _gdt32]
[global _idt32]
[global _idt16]
;-----------------------------------------------------------------------------
; imports
;-----------------------------------------------------------------------------
[extern _main32]
[extern __main]
[extern __atexit]
[extern code]
[extern data]
[extern bss]
[extern end]
[section .text]
[BITS 16]
;-----------------------------------------------------------------------------
; Name: load
; Desc: 16-bit entrypoint, jumps over the kernel header and exports
;-----------------------------------------------------------------------------
load:
jmp main16 ; jump over header
;-----------------------------------------------------------------------------
; Name: _header
; Desc: header of the kernel
;-----------------------------------------------------------------------------
_header:
dd 0x3233534f ; magic (OS32)
dd 0x00000000 ; flags (has to be filled in by OSLOADER so zero them for now)
dd 0x61313030 ; version (0.0.1.a)
dd _header
dd code
dd data
dd bss
dd end
dd load
dd 0x28; sizeof this structure (40 bytes)
;-------------------------------------------------------------------------------
; Name: _export_header
; Desc: Defines all the functions that are exported by the kernel.
; Kernel exports can only be used by system applications!
; For user programs there is a separate libary to do system calls.
;-------------------------------------------------------------------------------
_export_header:
dd 0x42545845 ; magic (EXTB - EXportTaBle)
dd 0x3 ; number of exports
dd _main32 ; first export
db "_main32" ; name of export
db 0x8 ; length of name
dd __main ;
db "__main" ; name of export
db 0x7 ; length of name
dd __atexit ;
db "__atexit" ; name of export
db 0x9 ; length of name
dd 0xfefefefe ; end of header
;-----------------------------------------------------------------------------
; Name: main16
; Desc: Sets up Protected Mode and jumps to the 32-bits entrypoint
;-----------------------------------------------------------------------------
main16:
cli
lgdt [cs:gdt] ; load GDT
mov ecx, cr0
inc cx
mov cr0, ecx ; switch to protected mode
; now enable the A20 address line
.1:
in al, 0x64
test al, 2
jnz .1
mov al, 0xD1
out 0x64, al
.2:
in al, 0x64
and ax, byte 2
jnz .2
mov al, 0xDF
out 0x60, al
; set segment registers to right values and go 32-bits :)
mov al, kernel_data
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov ss, ax
cli ; disable all interrupts
jmp dword 0x8:main32 ; jump, jump, jump :p
;-------------------------------------------------------------------------------
; Name: _gdt16 (16-bit)
; Desc: This is the actual Global Descriptor Table.
;-------------------------------------------------------------------------------
_gdt16:
dd 0 ; NULL descriptor
dd 0
kernel_code equ $-_gdt16 ; 0x08 kernel 4GB code at 0x00000000
dd 0xffff0000
dd 0x009acf00
kernel_data equ $-_gdt16 ; 0x10 kernel 4GB data at 0x00000000
dd 0xffff0000
dd 0x0092cf00
gdtend:
; 16-bit GDTR
gdt:
dw 0x7fff ; limit
dd _gdt16 ; pointer to the table
[BITS 32]
;-------------------------------------------------------------------------------
; Name: main32
; Desc: Calls the (de)constructor handlers and calls the main kernel routine
;-------------------------------------------------------------------------------
main32:
hlt
cli ; just to make sure
mov esp, 0x200000 ; set the stack pointer
call __main ; call constructors of all global objects
call _main32 ; load main routine
call __atexit ; call deconstructors of all global objects
[section .data]
;-------------------------------------------------------------------------------
; Name: _gdt32 (32-bit)
; Desc: Global Descriptor Table, this is used by the GDTManager
;-------------------------------------------------------------------------------
_gdt32:
dw 0x0
dd 0x0
;-------------------------------------------------------------------------------
; Name: _idt32 (32-bit)
; Desc: Interrupt Descriptor Table, this is used by the IDTManager
;-------------------------------------------------------------------------------
_idt32:
dw 0
dd 0
But thanks anyways.