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; SCCSID = @(#)exe.asm 1.1 85/04/10
; SCCSID = @(#)exe.asm 1.1 85/04/10
BREAK <EXEC and EXE file structures>
;
; EXEC arg block - load/go program
;
;
; The following get used as arguments to the EXEC system call. They indicate
; whether or not the program is executed or whether or not a program header
; gets created.
;
exec_func_no_execute EQU 1 ; no execute bit
exec_func_overlay EQU 2 ; overlay bit
Exec0 STRUC
Exec0_environ DW ? ; seg addr of environment
Exec0_com_line DD ? ; pointer to asciz command line
Exec0_5C_FCB DD ? ; default fcb at 5C
Exec0_6C_FCB DD ? ; default fcb at 6C
Exec0 ENDS
Exec1 STRUC
Exec1_environ DW ? ; seg addr of environment
Exec1_com_line DD ? ; pointer to asciz command line
Exec1_5C_FCB DD ? ; default fcb at 5C
Exec1_6C_FCB DD ? ; default fcb at 6C
Exec1_SP DW ? ; stack pointer of program
Exec1_SS DW ? ; stack seg register of program
Exec1_IP DW ? ; entry point IP
Exec1_CS DW ? ; entry point CS
Exec1 ENDS
Exec3 STRUC
Exec3_load_addr DW ? ; seg address of load point
Exec3_reloc_fac DW ? ; relocation factor
Exec3 ENDS
;
; Exit codes in upper byte
;
Exit_terminate EQU 0
Exit_abort EQU 0
Exit_Ctrl_C EQU 1
Exit_Hard_Error EQU 2
Exit_Keep_process EQU 3
;
; EXE file header
;
EXE_file STRUC
exe_signature DW ? ; must contain 4D5A (yay zibo!)
exe_len_mod_512 DW ? ; low 9 bits of length
exe_pages DW ? ; number of 512b pages in file
exe_rle_count DW ? ; count of reloc entries
exe_par_dir DW ? ; number of paragraphs before image
exe_min_BSS DW ? ; minimum number of para of BSS
exe_max_BSS DW ? ; max number of para of BSS
exe_SS DW ? ; stack of image
exe_SP DW ? ; SP of image
exe_chksum DW ? ; checksum of file (ignored)
exe_IP DW ? ; IP of entry
exe_CS DW ? ; CS of entry
exe_rle_table DW ? ; byte offset of reloc table
exe_iov DW ? ; overlay number (0 for root)
exe_sym_tab DD ? ; offset of symbol table in file
EXE_file ENDS
exe_valid_signature EQU 5A4Dh
exe_valid_old_signature EQU 4D5Ah
symbol_entry STRUC
sym_value DD ?
sym_type DW ?
sym_len DB ?
sym_name DB 255 dup (?)
symbol_entry ENDS
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