diff options
Diffstat (limited to 'bootblocks/com_bcc.s')
| -rw-r--r-- | bootblocks/com_bcc.s | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/bootblocks/com_bcc.s b/bootblocks/com_bcc.s deleted file mode 100644 index 061575f..0000000 --- a/bootblocks/com_bcc.s +++ /dev/null @@ -1,65 +0,0 @@ - -! This header assumes only that we're loaded at a 16 byte boundry - -ENDOFF=4 ! If you add code adjust this till it stops failing. - -org 0 -entry start -public start -start: - call chk ! This chunk allows this code to exist at _any_ click -chk: - pop ax - mov cl,#4 - shr ax,cl - mov bx,cs - add ax,bx - push ax - mov bx,#going - push bx - retf -going: - mov ds,ax - - add ax,#ENDOFF+2 ! New CS - mov bx,ax ! Saved - mov dx,[a_entry] ! Save the entry - zero - mov ax,[btype] - and ax,#$20 ! Split I/D ? - jz impure - mov cl,#4 - mov ax,[a_text] - shr ax,cl -impure: ! ax is now offset 'tween CS&DS - add ax,bx ! ax = DS - mov ss,ax - mov sp,[a_total] ! SS:SP is now ready for prog. - mov ds,ax - xor cx,cx ! argc, argv and envp = 0 - push cx - push cx - push cx - push bx ! CS - push dx ! Entry address - retf ! Gone. - -! Check for overlap -end_of_code: - if end_of_code>hitme - fail! At end_of_code - endif - -.org ((ENDOFF)<<4)-1 -hitme: -.byte 0xFF ! Marker - -magic: .space 2 ! A.out header -btype: .space 2 -headerlen: .space 4 -a_text: .space 4 -a_data: .space 4 -a_bss: .space 4 -a_entry: .space 4 -a_total: .space 4 -a_syms: .space 4 -.org (ENDOFF+2)<<4 ! Code start. |