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Added access of DATA section for LDI and SVI.
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Russell-S-Harper
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@ -34,14 +34,14 @@ The meat of the project:
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* `common/common.h`: details of instructions
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* `common/common.asm`: assembler code for the instructions
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* `common/macros.h`: macros used to define the interpreted byte-code
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* `common/page6.src`: sample source file using the macros
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* `common/appl.src`: sample source file using the macros
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Auxiliary:
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* `emulator/*`: 6502 emulator (borrowed Mike Chambers’ Fake6502 CPU emulator v1.1 ©2011)
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* `xa-pre-process/*`: my utility `xapp` to convert 32-bit fixed decimal quantities so that `xa` can use them
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Right now, for testing purposes, the code builds everything into one file `system.obj` and runs the code in the last block loaded, in this case, the code corresponding to `page6.src`. Eventually will support decoupling of system and application files. Application files will be inherently relocatable.
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Right now, for testing purposes, the code builds everything into one file `system.obj` and runs the code in the last block loaded, in this case, the code corresponding to `appl.src`. Eventually will support decoupling of system and application files. Application files will be inherently relocatable.
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To build and run:
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@ -1,17 +1,17 @@
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XAPP=../xa-pre-process/xapp
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system.obj: common.obj page6.obj
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cat common.obj page6.obj > system.obj
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system.obj: common.obj appl.obj
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cat common.obj appl.obj > system.obj
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common.obj: rom.h common.h common.asm
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xa -C -M common.asm -l common.lbl -o common.obj
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page6.obj: rom.h macros.h globals.h page6.src
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cpp -P page6.src | $(XAPP) > page6.asm
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xa -C -M page6.asm -l page6.lbl -o page6.obj
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appl.obj: rom.h macros.h globals.h appl.src
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cpp -P appl.src | $(XAPP) > appl.asm
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xa -C -M appl.asm -l appl.lbl -o appl.obj
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globals.h: common.obj
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grep -E '^(FN_XR|FN_0X|PLS_1|MNS_1|ADDR)' common.lbl | sed -e 's/, 0, 0x0000//' -e 's/, / = /' -e 's/ 0x/ \x24/' > globals.h
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clean:
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rm -f globals.h page6.asm common.obj page6.obj common.lbl page6.lbl system.obj
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rm -f globals.h appl.asm common.obj appl.obj common.lbl appl.lbl system.obj
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@ -2,27 +2,31 @@
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#include "macros.h"
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#include "globals.h"
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* = $1000 ; any address outside of page zero is okay
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* = $300 ; any address outside of page zero is okay because all code is relocatable
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CODE(DEMO)
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START
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CMN
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SET(R0, 9.4662)
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SET(R1, 5)
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SET(R1, SQRT2)
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LDI(R7, R1)
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MUL(R7, R7, R7)
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SVI(R1, R0)
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PSH(R0)
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BRS(FACTORIAL)
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POP(R4)
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SET(R5, 1)
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SET(R5, E)
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LDI(R6, R5)
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SET(R1, ZERO)
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INR(R1)
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SVI(R1, R6)
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LDI(R0, R1)
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ESC
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BRK
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BEGIN(FACTORIAL)
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POP(R1)
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SET(R2, 3)
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SET(R2, 1)
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MOD(R3, R1, R2)
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SUB(R1, R1, R3)
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_1 TST(R1)
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@ -36,9 +40,14 @@ END(FACTORIAL)
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END(DEMO)
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DATA(WORKING)
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PI VALUE(3.14159)
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E VALUE(2.71828)
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SQRT2 VALUE(1.41421)
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ZERO RESERVE(2)
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END(WORKING)
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DATA(_)
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; preset constants
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DEFINE(PI, 3.14159)
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DEFINE(E, 2.71828)
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DEFINE(SQRT2, 1.41421)
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; working space
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RESERVE(2)
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END(_)
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@ -78,24 +78,23 @@
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#define EXT(f) .BYTE _EXT_C + (f)
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; header for fixed code or data
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#define FIXED(l) .BYTE _SM_FXD:.WORD l, _END_##l - l:* = * - 5:l .(
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#define FIXED(l) .BYTE _SM_FXD : .WORD l, _END_##l - l : * = * - 5 : l .(
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; header for relocatable code: l(abel) => starting offset, length of code
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#define CODE(l) .BYTE _RLC_CD:.WORD _start - l, _END_##l - l: * = * -5:l .(
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#define CODE(l) .BYTE _RLC_CD : .WORD _start - l, _END_##l - l : * = * - 5 : l .(
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#define START &_start
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; header for relocatable data: l(abel) => length of zeroed data, length of preset data
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#define DATA(l) .BYTE _RLC_DT:.WORD _END_##l - _zero, _zero - l: * = * - 5:l .(
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#define ZERO &_zero
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#define DATA(l) .BYTE _RLC_DT : .WORD _END_##l - _zero, _zero - l : * = * - 5 : l .( : &_data
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; initialize v(alue)
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#define VALUE(v) .BYTE _SET_V(#v)
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; define l(abel), v(alue)
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#define DEFINE(l, v) &l .BYTE _SET_V(#v)
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; reserve c(ount)
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#define RESERVE(c) * = * + c * 4
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; reserve c(ount) & provide an alias for _zero
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#define RESERVE(c) &ZERO : &_zero : * = * + (c) * 4
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; common begin and end
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#define BEGIN(l) l .(
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#define END(l) .):_END_##l
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#define END(l) .) : _END_##l
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#endif /* __MACROS_H */
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@ -27,8 +27,17 @@ int main(int argc, char **argv)
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const char *s = "", *p, *q;
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switch (tokens[i].type)
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{
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/* Process each _SET_V("<expr>") command */
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case TT_COMMAND:
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/* Process each _SET_V("<label>") command */
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case TT_LABEL:
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/* Extract the start and ending indices */
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p = strchr(tokens[i].text, '"') + 1;
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q = strrchr(tokens[i].text, '"');
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j = (int)(q - p);
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/* Output in .BYTE format */
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printf("0, <(%.*s - _data), >(%.*s - _data), 0", j, p, j, p);
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break;
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/* Process each _SET_V("<expression>") command */
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case TT_EXPRESSION:
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/* Extract the start and ending indices */
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p = strchr(tokens[i].text, '"') + 1;
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q = strrchr(tokens[i].text, '"');
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@ -50,7 +50,7 @@
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typedef enum
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{
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TT_COMMAND, TT_DEFAULT, TT_WHITE_SPACE, TT_END_OF_LINE
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TT_LABEL, TT_EXPRESSION, TT_DEFAULT, TT_WHITE_SPACE, TT_END_OF_LINE
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} TOKEN_TYPE;
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typedef struct
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@ -72,18 +72,25 @@ int tokenizeInput(const char *cursor, TOKEN *tokens)
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WHITE_SPACE = BELL | BACKSPACE | HORIZONTAL_TAB | ESCAPE | DELETE | SPACE ;
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SET_V_BGN = LOW_LINE [Ss][Ee][Tt] LOW_LINE [Vv] WHITE_SPACE* LEFT_PARENTHESIS WHITE_SPACE* QUOTATION_MARK ;
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SET_V_END = QUOTATION_MARK WHITE_SPACE* RIGHT_PARENTHESIS ;
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VALID = DIGIT | LETTER | EXCLAMATION_MARK | DOLLAR_SIGN | PERCENT_SIGN | AMPERSAND
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| LEFT_PARENTHESIS | RIGHT_PARENTHESIS | ASTERISK | PLUS_SIGN | HYPHEN_MINUS
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| FULL_STOP | SOLIDUS | LESS_THAN_SIGN | EQUALS_SIGN | GREATER_THAN_SIGN
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| LOW_LINE | VERTICAL_LINE | TILDE | WHITE_SPACE ;
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COMMAND = LOW_LINE [Ss][Ee][Tt] LOW_LINE [Vv] WHITE_SPACE* LEFT_PARENTHESIS WHITE_SPACE* QUOTATION_MARK VALID+ QUOTATION_MARK WHITE_SPACE* RIGHT_PARENTHESIS ;
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LABEL = SET_V_BGN ( LETTER | LOW_LINE ) ( LETTER | LOW_LINE | DIGIT )* SET_V_END ;
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EXPRESSION = SET_V_BGN VALID+ SET_V_END ;
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DEFAULT = . ;
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END_OF_LINE = ( LINE_FEED | VERTICAL_TAB | FORM_FEED | CARRIAGE_RETURN )+ ;
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COMMAND { i = copyToken(tokens, i, TT_COMMAND, token, (int)(cursor - token)); continue; }
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LABEL { i = copyToken(tokens, i, TT_LABEL, token, (int)(cursor - token)); continue; }
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EXPRESSION { i = copyToken(tokens, i, TT_EXPRESSION, token, (int)(cursor - token)); continue; }
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DEFAULT { i = copyToken(tokens, i, TT_DEFAULT, token, (int)(cursor - token)); continue; }
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WHITE_SPACE { i = copyToken(tokens, i, TT_WHITE_SPACE, token, (int)(cursor - token)); continue; }
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END_OF_LINE { i = copyToken(tokens, i, TT_END_OF_LINE, token, (int)(cursor - token)); continue; }
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