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- /*
- HEADER: CUG113;
- TITLE: 6800 Cross-Assembler (BDS C Version);
- FILENAME: A68.H;
- VERSION: 2.6;
- DATE: 07/22/1985;
-
- DESCRIPTION: "This program lets you use your CP/M-80-based computer
- to assemble code for the Motorola 6800, 6801, 6802,
- 6803, 6808, and 68701 microprocessors. The program is
- written in BDS C for the best possible performance on
- 8-bit machines. All assembler features are supported
- except relocation, linkage, listing control, and
- macros.";
-
- KEYWORDS: Software Development, Assemblers, Cross-Assemblers,
- Motorola, MC6800, MC6801;
-
- SEE-ALSO: CUG149, 6801 Cross-Assembler (Portable);
-
- SYSTEM: CP/M-80;
- COMPILERS: BDS C;
-
- WARNINGS: "This package is specifically tailored to CP/M-80
- machines and the rather non-standard, but high-
- performance BDS C compiler. For other environments,
- use the portable version of this package on CUG149.";
-
- AUTHORS: William C. Colley III;
- */
-
- /*
- 6800/6801 Cross-Assembler v. 2.6
-
- May, 1980
-
- July, 1980 -- Rev. 2.2 consisting of fixing the M errors that
- come from forward references in FDB and FCB pseudo-ops.
-
- October, 1980 -- Rev. 2.3 consisting of updating the assembly
- language file and I/O routines to match and take
- advantage of BDS C V1.4.
-
- October, 1983 -- Rev. 2.4 consisting of adding the CPU pseudo-op,
- adding the 6801 CPU's extra opcodes, and speeding up the
- code a bit.
-
- September, 1984 -- Rev. 2.5 consisting of fixing bugs with the symbol
- table sort, the writing of files to specified drives, and the
- handling of blank input lines.
-
- June, 1985 -- Rev. 2.6 consisting of fixing a bug in the IF block
- nesting mechanism.
-
- Copyright (c) 1980,83,84,85 William C. Colley, III.
-
- File: a68.h
-
- Global macro substitutions and external variable declarations.
- */
-
- /* For the benefit of BDS C V1.4's library functions: */
-
- #include <bdscio.h>
- /* Note: The cross assembler will run more
- efficiently and with less head racket
- if the number of sectors of disk buffer
- specified by BDSCIO.H is at least 8. */
-
- /* Set input line length: */
-
- #define LINLEN 120 /* Length of input line in characters. */
-
- /* Define symbol table parameters: */
-
- #define SYMLEN 8 /* Length of labels (must be an even number). */
- #define SYMBOLS 500 /* Number of symbols in symbol table. */
- #define PADDING " " /* SYMLEN - 1 blanks. */
-
- /* Number of if statements that can be nested: */
-
- #define IFDEPTH 16
-
- #define ON 1
- #define OFF -1
-
- /* BDOS functions called directly: */
-
- #define GETDISK 25 /* Get currently logged in disk. */
-
- /* Define flag values: */
-
- #define SKIP TRUE /* Used with skip flag in getchr. */
- #define NOSKIP FALSE
- #define BIGST TRUE /* Used to tell kind of string in getitem. */
- #define SMALST FALSE
- #define NOCODE 0 /* Used to tell the hex generator what to do. */
- #define PUTCODE 1
- #define FLUSH 2
- #define NOMORE 3
-
- /* File descriptors: */
-
- #define NOFILE -1 /* No file specified. */
- #define CONO 1 /* Console output. */
- #define LST 2 /* List device. */
- #define LODISK 4 /* Lowest numbered disk. */
-
- /* Items can have the following attributes: */
-
- #define ALPHA 0 /* Alphabetic character. */
- #define NUMERIC 1 /* Numeric digit (0-9). */
- #define END_LIN 2 /* End-of-Line marker (cr or ;). */
- #define COMMA 3 /* Field separator (,). */
- #define OPERATR 4 /* Operator (* - GE < ( SHR etc.). */
- #define BAS_DES 5 /* Base designator ($ % @). */
- #define QUOTE 6 /* String delimiter (" '). */
- #define IMMED 7 /* Immediate mode indicator (#). */
- #define VALUE 8 /* Evaluated expression. */
- #define REGISTR 9 /* Register designator (A B X). */
- #define BLANK 10 /* White space (spc tab). */
- #define TRASH 11 /* Other characters. */
-
- /* Some tokens for composite operators: */
-
- #define NO_OPR 0 /* No operator. */
- #define GRTEQ 1 /* Greater than or equal to. */
- #define NOTEQ 2 /* Not equal to. */
- #define LESEQ 3 /* Less than or equal to. */
- #define AND 4 /* And. */
- #define OR 5 /* Or. */
- #define XOR 6 /* Exclusive or. */
- #define NOT 7 /* 1's complement. */
- #define MOD 8 /* Mod--divide and return remainder. */
- #define SHL 9 /* Shift left. */
- #define SHR 10 /* Shift right. */
- #define HIGH 11 /* High byte of. */
- #define LOW 12 /* Low byte of. */
-
- /* Operator precedence values: */
-
- #define UOP1 0 /* Unary +, unary -. */
- #define MULT 1 /* *, /, MOD, SHL, SHR. */
- #define ADDIT 2 /* Binary +, binary -. */
- #define RELAT 3 /* >, =, <, >=, <>, <=. */
- #define UOP2 4 /* NOT. */
- #define LOG1 5 /* AND. */
- #define LOG2 6 /* OR, XOR. */
- #define UOP3 7 /* HIGH, LOW. */
- #define RPREN 8 /* ). */
- #define LPREN 9 /* (. */
- #define ENDEX 10 /* CR, ;, ,. */
- #define START 11 /* Start of expression. */
-
- /* Bits of opcode attribute byte. */
-
- #define PSOP 0x80 /* Pseudo-op. */
- #define DIROK 0x40 /* Non-pseudo-op is OK for direct addressing. */
- #define IFGROUP 0x40 /* Pseudo-op is IF, ELSE, ENDI. */
- #define REL 0x20 /* Relative addressing required. */
- #define REGREQ 0x10 /* A, B must be specified. */
- #define IMM16 0x08 /* 16-bit immediate addressing OK. */
- #define IMM8 0x04 /* 8-bit immediate addressing OK. */
- #define INDEX 0x02 /* Indexed or extended addressing OK. */
- #define REGOPT 0x01 /* A, B optional. */
- #define IS6801 0x11 /* 6801 opcode. */
-
- /* Set up disk I/O buffers: */
-
- struct _buf _source, _list, _hex, *source, *list, *hex;
-
- /* Set up the symbol table: */
-
- struct symbtbl
- {
- char symname[SYMLEN];
- unsigned symvalu;
- }
- symtbl[SYMBOLS], *symend, *sympoint;
-
- /* If stack and stack pointer. */
-
- char ifsp;
- unsigned ifstack[IFDEPTH+1];
-
- /* Buffer to hold current line: */
-
- char *linptr, linbuf[LINLEN];
-
- /* Buffer to hold the code generated by a line. */
-
- char nbytes, binbuf[255];
-
- /* Buffers for the hex generator. */
-
- char chksum, hxbytes, *hxlnptr, hxlnbuf[44];
-
- /* Miscellanious mailboxes: */
-
- char errcode; /* Error records. */
- int errcount;
- char evalerr; /* Flag to tell of error in eval. */
- char backflg, oldattr; /* Item push-back buffer. */
- unsigned oldvalu;
- char curdrive; /* Place to save drive that was current
- disk when assembly started. */
- char hexflg; /* Flag for asmline to tell hex
- generator what to do. */
- char directok; /* All symbols on line pre-defined. */
- unsigned pc; /* Assembly program counter. */
- unsigned address; /* Address to be put into listed line. */
- char pass; /* Which pass the assembly is in. */
- char extend; /* 6801 extensions enabled/disabled. */
-
- /* Some trivial functions: */
-
- #define backchr --linptr /* Push back a character. */
-
- uffer to ho