v4.0/src/INC/EXE.INC

   1 ;       SCCSID = @(#)exe.asm    1.1 85/04/10
   2 ;       SCCSID = @(#)exe.asm    1.1 85/04/10
   3 BREAK <EXEC and EXE file structures>
   4 ;
   5 ; EXEC arg block - load/go program
   6 ;
   7
   8 ;
   9 ; The following get used as arguments to the EXEC system call.  They indicate
  10 ; whether or not the program is executed or whether or not a program header
  11 ; gets created.
  12 ;
  13 exec_func_no_execute    EQU 1           ; no execute bit
  14 exec_func_overlay       EQU 2           ; overlay bit
  15
  16 Exec0           STRUC
  17 Exec0_environ   DW      ?               ; seg addr of environment
  18 Exec0_com_line  DD      ?               ; pointer to asciz command line
  19 Exec0_5C_FCB    DD      ?               ; default fcb at 5C
  20 Exec0_6C_FCB    DD      ?               ; default fcb at 6C
  21 Exec0           ENDS
  22
  23 Exec1           STRUC
  24 Exec1_environ   DW      ?               ; seg addr of environment
  25 Exec1_com_line  DD      ?               ; pointer to asciz command line
  26 Exec1_5C_FCB    DD      ?               ; default fcb at 5C
  27 Exec1_6C_FCB    DD      ?               ; default fcb at 6C
  28 Exec1_SP        DW      ?               ; stack pointer of program
  29 Exec1_SS        DW      ?               ; stack seg register of program
  30 Exec1_IP        DW      ?               ; entry point IP
  31 Exec1_CS        DW      ?               ; entry point CS
  32 Exec1           ENDS
  33
  34 Exec3           STRUC
  35 Exec3_load_addr DW      ?               ; seg address of load point
  36 Exec3_reloc_fac DW      ?               ; relocation factor
  37 Exec3           ENDS
  38
  39 ;
  40 ; Exit codes in upper byte
  41 ;
  42 Exit_terminate      EQU     0
  43 Exit_abort          EQU     0
  44 Exit_Ctrl_C         EQU     1
  45 Exit_Hard_Error     EQU     2
  46 Exit_Keep_process   EQU     3
  47
  48 ;
  49 ; EXE file header
  50 ;
  51
  52 EXE_file    STRUC
  53 exe_signature   DW  ?                   ; must contain 4D5A  (yay zibo!)
  54 exe_len_mod_512 DW  ?                   ; low 9 bits of length
  55 exe_pages       DW  ?                   ; number of 512b pages in file
  56 exe_rle_count   DW  ?                   ; count of reloc entries
  57 exe_par_dir     DW  ?                   ; number of paragraphs before image
  58 exe_min_BSS     DW  ?                   ; minimum number of para of BSS
  59 exe_max_BSS     DW  ?                   ; max number of para of BSS
  60 exe_SS          DW  ?                   ; stack of image
  61 exe_SP          DW  ?                   ; SP of image
  62 exe_chksum      DW  ?                   ; checksum  of file (ignored)
  63 exe_IP          DW  ?                   ; IP of entry
  64 exe_CS          DW  ?                   ; CS of entry
  65 exe_rle_table   DW  ?                   ; byte offset of reloc table
  66 exe_iov         DW  ?                   ; overlay number (0 for root)
  67 exe_sym_tab     DD  ?                   ; offset of symbol table in file
  68 EXE_file    ENDS
  69
  70 exe_valid_signature     EQU 5A4Dh
  71 exe_valid_old_signature EQU 4D5Ah
  72
  73 symbol_entry    STRUC
  74 sym_value       DD  ?
  75 sym_type        DW  ?
  76 sym_len         DB  ?
  77 sym_name        DB  255 dup (?)
  78 symbol_entry    ENDS