Category : Recently Uploaded Files
Archive   : OXCC1432.ZIP
Filename : ANF.DOC

Output of file : ANF.DOC contained in archive : OXCC1432.ZIP
ANF.DOC -- preliminary 15 May 1995 by Norman D. Culver

Architecture Neutral Format (ANF) code is generated by `oxcc' and
placed in files with a .anf suffix. The purpose of ANF code is to
allow multiple back ends to be written by users. A sample back end
is `oxccb' which converts .anf to .byt for interpretation by the
sample interpreter `bterp'.

The .anf format is given precisely in the files `oxanf.h' and `oxccb.c'.
Files are always generated in little endian format.

Each ANF instruction is 8 bytes of required info plus an optional
number of additional bytes depending upon whether the opcode uses
0,1,2 or 3 address format.

The programmer can view .anf code in human readable format by using
the -Gd option in `oxcc' which will produce a readable file with
a .dbg suffix.

Byte Meaning Format
0 opcode cccccccc 0-255
1 non zero if D address used tttsssss 0-7|0-31
2 non zero if L address used tttsssss 0-7|0-31
3 non zero if R address used tttsssss 0-7|0-31
4 unsigned size of anf instruction
5-7 always zero in file, used for linking by backends
8-n optional address elements D,L,R (no holes)

c is the opcode
t is the type of the address element
s is the size of the address element

Address element types:
0 == OPIMMED1 immediate signed value(s)
1 == OPIMMED2 immediate unsigned value(s)
2 == OPIMMED3 immediate floating value
3 == OPIMMED4 immediate pointer value
4 == OPTEMP temp designator
5 == OPRET return designator
6 == OPAUTO autovar address
7 == OPDATA data address

Each ANF section in a file is preceeded by a header consisting of 24
bytes in the following format:

0xa5,0x30,0,0,0,0,0,0 // headerop,OPIMMED2|16,0,0,0,0,0,0
struct _hdr { /* see oxanf.h */
unsigned short major;
unsigned short minor;
char code_format;
char target_hardware;
char target_debugger;
char target_os;
char memory_model;
char obj_format;
char opt_level;
char target_assembler;
char pads[4];

A file is terminated with a trailer consisting
of 8 bytes in the following format:

0xc4,0,0,0,0,0,0,0 // endallop,0,0,0,0,0,0,0

  3 Responses to “Category : Recently Uploaded Files
Archive   : OXCC1432.ZIP
Filename : ANF.DOC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: