Protected mode, setting segment registers

Question

I'm recently playing with gnu-assembler in simple os development. I'm using code below to switch CPU to protected mode. In order to do this I set GDT as follow and performed far jump to given label wit 0x08 as GDT offset (to set CS). CPU did not reset itself after jmp , but none of mov instructions were executed correctly after jumping to leaveToKernel . The reason why Im saying that mov failed to set DS and SS is this qemu print ( info registers ):

EAX=00000000 EBX=00105fd8 ECX=000003eb EDX=000b8000
ESI=00010000 EDI=00000000 EBP=00105fc0 ESP=00105fc0
EIP=0083ec44 EFL=00200002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0008 00100000 02710fff 00c09a00 DPL=0 CS32 [-R-]
SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]

Can someone help me understand and explain this behaviour? Thanks in advance

The code used to switch CPU to p-mode(GAS syntax):

.equ NULL_DESCRIPTOR,  0x0000000000000000

.equ CODE0,          0x00C09A1000002710
.equ DATA0,          0x00C09210010007D0
.equ PLACE_HLD1,     0x0000000000000000
.equ PLACE_HLD2,     0x0000000000000000
.section .data
     GDT:
        .quad NULL_DESCRIPTOR
        .quad CODE_P0
        .quad DATA_P0
        .quad PLACE_HLD1
        .quad PLACE_HLD2
    _GDT:
        .word 24
        .long GDT
.section .text
.global setProtectedMode
.type setProtectedMode, @function
setProtectedMode:
    push %ebp
    mov %esp,%ebp

    cli
    lgdt _GDT
    mov %cr0, %eax
    or $1, %eax
    mov %eax, %cr0
    jmp $0x08 ,$leaveToKernel
    leaveToKernel:
    xor %eax, %eax
    mov $0x10, %ax
    mov %ax, %ss
    mov %ax, %ds
    hlt
leave    
ret

Answer 1

Apparently your CS base is not zero so I say you are not jumping to the proper place. It's not usual to have non-zero CS base, I assume you did want 0, but set up the GDT entry wrong. Fix it :)