[syslinux] gpxelinux.0 (and maybe pxelinux.0) brokensince 51f563a2e52d1e2668e7b7a3d480c4f1e4b89d97

[H. Peter Anvin]

Sebastian Herbszt wrote:
> 
> pxelinux.lst:
> 
>   1060 00007C61 0FB52E[6026]                         lgs bp,[InitStack]      ; GS:BP -> original stack
>   1061 00007C66 65C45E30                                les bx,[gs:bp+48]
>   1062 00007C6A E8(9D15)                                call is_pxe
>   1063 00007C6D 0F842001                                je have_pxe
> ...
>   5264                                  is_pxe          equ is_struc.pxe
>   5265                                  is_pxenv      equ is_struc.pxenv
>   5266                                  is_struc:
>   5267                                  .pxe:
>   5268 0000919D 2666813F21505845                        cmp dword [es:bx],'!PXE'
> 
> bochsdbg:
> 
> <bochs:7> p
> Next at t=36890078
> (0) [0x00007c61] 0000:7c61 (unk. ctxt): lgs bp, ds:0x2e60         ; 0fb52e602e
> <bochs:8> p
> Next at t=36890079
> (0) [0x00007c66] 0000:7c66 (unk. ctxt): les bx, gs:[bp+0x30]      ; 65c45e30
> <bochs:9> p
> Next at t=36890080
> (0) [0x00007c6a] 0000:7c6a (unk. ctxt): call .+0x9930 (0x0000159d) ; e83099
> <bochs:10> s
> Next at t=36890081
> (0) [0x0000159d] 0000:159d (unk. ctxt): add byte ptr ds:[bx+si], al ; 0000
> <bochs:11> p
> 
> The call to is_pxe doesn't end up where it should (0000:159d instead of 0000:919d).
> 

Uhm... that doesn't happen to me.  What version of NASM are you using?

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.