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Viewing changes to src/stub/l_exe.asm

  • Committer: Bazaar Package Importer
  • Author(s): Robert Luberda
  • Date: 2006-06-13 21:23:23 UTC
  • mfrom: (1.3.1 upstream) (3.1.2 edgy)
  • Revision ID: james.westby@ubuntu.com-20060613212323-343yzs4jt6vr5483
* New upstream version.
* Standards-Version: 3.7.2 (no changes).

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Lines of Context:
src/stub/l_exe.asm
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                SECTION .text
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                CPU     8086
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;       __DEVICEENTRY__
 
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                dd      -1
 
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                dw      0
 
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                dw      strategy        ; .sys header
 
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                dw      0               ; opendos wants this field untouched
 
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original_strategy:
 
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                dw      'ST'
 
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strategy:
 
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                push    cs
 
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                push    word [cs:original_strategy]
 
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                push    ax
 
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                push    bx
 
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                push    cx
 
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                push    dx
 
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                mov     ax, cs
 
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                add     ax, 'OS'        ; calculate normal EXE stack
 
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                mov     bx, 'OP'
 
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                mov     cx, ss
 
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                mov     dx, sp
 
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                mov     ss, ax          ; switch to stack EXE normally has
 
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                mov     sp, bx
 
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                push    cx              ; save device stack on EXE stack
 
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                push    dx
 
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                push    si
 
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                push    di
 
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                push    bp
 
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                push    ds
 
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                push    es
 
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                db      0x72            ; "jc 0xf9" but flag C is 0 => nop
 
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exe_as_device_entry:
 
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                stc                     ; flag C is 1
 
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                pushf
 
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; =============
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; ============= ENTRY POINT
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; =============
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;       __EXEENTRY__
 
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exe_entry:
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                mov     cx, 'CX'        ; first_copy_len/2
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                mov     si, 'SI'        ; cx*2-2
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                mov     di, si
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do_copy:
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                mov     ch, 0x80        ; 64 kbyte
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                mov     ax, cs
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                add     ax, 'DS'
 
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addaxds:
 
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                add     ax, 'DS'        ; MSB is referenced by the "sub" below
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                mov     ds, ax
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                add     ax, 'ES'
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                mov     es, ax
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                rep
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                movsw
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                cld
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                sub     [byte cs:si+do_copy+6+2], byte 0x10
 
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;       __DEVICESUB__
 
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                sub     [byte cs:si + addaxds + 4], byte 0x10
 
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;       __EXESUB__
 
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                sub     [byte cs:si + addaxds - exe_entry + 4], byte 0x10
 
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;       __JNCDOCOPY__
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                jnc     do_copy
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                xchg    ax, dx
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                scasw
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                pop     es
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                push    es
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                pop     ds
 
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;       __DEVICEEND__
 
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                popf
 
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                jc      loaded_as_exe
 
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                pop     es
 
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                pop     ds
 
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                pop     bp
 
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                pop     di
 
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                pop     si
 
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                pop     bx              ; get original device SS:SP
 
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                pop     ax
 
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                mov     ss, ax          ; switch to device driver stack
 
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                mov     sp, bx
 
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                pop     dx
 
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                pop     cx
 
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                pop     bx
 
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                pop     ax
 
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                retf                    ; return to original strategy
 
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loaded_as_exe:
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%ifdef  __EXESTACK__
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                lea     ax, ['SS'+bp]
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                mov     ss, ax