chiptune: more debugging of lz4 code
This commit is contained in:
Vince Weaver
parent
e0946b1bdf
commit
0cb0911151
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@ -51,16 +51,17 @@ lz4_decode:
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unpmain:
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ldy #0
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ldy #0 ; used to index
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parsetoken:
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jsr getsrc
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pha
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jsr getsrc ; get next token
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pha ; save for later (need bottom 4 bits)
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lsr ; number of literals in top 4 bits
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lsr ; so shift into place
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lsr
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lsr
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lsr
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lsr
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beq copymatches
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beq copymatches ; if zero, then no literals
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jsr buildcount
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tax
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@ -72,15 +73,20 @@ parsetoken:
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bcs done
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copymatches:
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jsr getsrc
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jsr getsrc ; get 16-bit delta value
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sta delta
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jsr getsrc
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sta delta+1
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pla
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and #$0f
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pla ; restore token
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and #$0f ; get bottom 4 bits
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; match count. 0 means 4
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; 15 means 19+, must be calculated
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jsr buildcount
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clc
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adc #4
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adc #4 ; adjust count by 4 (minmatch)
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tax
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bcc copy_skip
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inc count+1
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@ -21,24 +21,28 @@ static unsigned char input[MAX_INPUT];
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static void getsrc(void) {
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//getsrc:
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a=ram[y_indirect(src,y)]; // lda (src), y
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printf("LOAD %02X%02X: %02X\n",ram[src+1],ram[src],a);
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ram[src]++; //inc src
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if (ram[src]!=0) goto done_getsrc; //bne +
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ram[src+1]++; //inc src+1
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done_getsrc: ;
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printf("LOADED %02X%02X-1: %02X\n",ram[src+1],ram[src],a);
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//+ rts
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}
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void buildcount(void) {
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printf("\tBUILDCOUNT: A=0x%x\n",a);
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//buildcount:
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x=1; // ldx #1
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ram[count+1]=x; // stx count+1
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cmp(0xf); // cmp #$0f
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if (z==0) goto done_buildcount; // bne ++
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x=1; // ?? // ldx #1
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ram[count+1]=x; // ?? // stx count+1
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cmp(0xf); // if 15, more complicated // cmp #$0f
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if (z==0) goto done_buildcount; // otherwise A is count // bne ++
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minus_buildcount:
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ram[count]=a; //- sta count
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printf("MBC ");
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// printf("MBC ");
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printf("\tADDITIONAL BUILDCOUNT ");
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getsrc(); //jsr getsrc
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x=a; //tax
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c=0; //clc
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@ -49,6 +53,8 @@ skip_buildcount:
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x++; //+ inx
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if (x==0) goto minus_buildcount; //beq -
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done_buildcount: ; //++ rts
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printf("\tBUILDCOUNT= r[c+1]=%02X r[c]=%02X a=%02X x=%02X\n",
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ram[count+1],ram[count],a,x);
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}
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@ -56,12 +62,14 @@ static void putdst(void) {
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// printf("PUTADDR=%04X\n",y_indirect(dst,y));
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// putdst:
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ram[y_indirect(dst,y)]=a; // sta (dst), y
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if (y!=0) printf("ERROR ERROR ERROR ERROR ERROR\n");
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printf("\t\tPUT: %02X%02X = %02X\n",ram[dst+1],ram[dst],a);
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ram[dst]++; // inc dst
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if (ram[dst]!=0) goto putdst_end; // bne +
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ram[dst+1]++; // inc dst+1
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putdst_end:;
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//+ rts
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printf("\tPUT: %02X%02X-1,%02X = %02X\n",ram[dst+1],ram[dst],y,a);
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}
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static void getput(void) {
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@ -73,7 +81,9 @@ static void getput(void) {
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static void docopy(void) {
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// docopy:
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docopy_label:
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printf("\tDOCOPY %02X%02X: ",ram[count+1]-1,x);
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getput(); // jsr getput
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x--; // dex
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if (x!=0) goto docopy_label; // bne docopy
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@ -163,27 +173,30 @@ int main(int argc, char **argv) {
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//unpack: //;unpacker entrypoint
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goto unpmain; // jmp unpmain
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// goto unpmain; // jmp unpmain
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unpmain:
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y=0; //ldy #0
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//unpack:
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y=0; // used for offset //ldy #0
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parsetoken:
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printf("PT ");
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getsrc(); // jsr getsrc
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pha(); // pha
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lsr(); // lsr
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lsr(); // lsr
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lsr(); // lsr
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lsr(); // lsr
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if (a==0) goto copymatches; // beq copymatches
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printf("LOAD TOKEN: ");
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getsrc(); // jsr getsrc
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// get token
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pha(); // save for later // pha
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lsr(); // num literals in top 4 // lsr
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lsr(); // lsr
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lsr(); // lsr
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lsr(); // lsr
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if (a==0) goto copymatches; // if zero, no literals // beq copymatches
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buildcount(); // otherwise, build the count // jsr buildcount
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buildcount(); // jsr buildcount
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x=a; // tax
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docopy(); // jsr docopy
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a=ram[src]; // lda src
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cmp(ram[end]); // cmp end
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a=ram[src+1]; // lda src+1
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sbc(ram[end+1]); // sbc end+1
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if (c) {
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printf("Done!\n");
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@ -193,16 +206,17 @@ parsetoken:
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}
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copymatches:
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printf("CM1 ");
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getsrc(); // jsr getsrc
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ram[delta]=a; // sta delta
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printf("CM1 ");
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getsrc(); // jsr getsrc
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ram[delta+1]=a; // sta delta+1
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printf("DELTA is %02X%02X\n",ram[delta+1],ram[delta]);
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pla(); // pla
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a=a&0xf; // and #$0f
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printf("\tDELTAL ");
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getsrc(); // jsr getsrc
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ram[delta]=a; // sta delta
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printf("\tDELTAH ");
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getsrc(); // jsr getsrc
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ram[delta+1]=a; // sta delta+1
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printf("\tDELTA is %02X%02X\n",ram[delta+1],ram[delta]);
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pla(); // restore token // pla
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a=a&0xf; // get bottom 4 bits // and #$0f
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buildcount(); // jsr buildcount
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c=0; // clc
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adc(4); // adc #4
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x=a; // tax
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@ -213,7 +227,7 @@ copy_skip:
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pha(); // pha
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a=ram[src]; // lda src
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pha(); // pha
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// printf("SAVED SRC: %02X%02X\n",ram[src+1],ram[src]);
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printf("\tSAVED SRC: %02X%02X\n",ram[src+1],ram[src]);
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// printf("CALCULATING: DST %02X%02X - DELTA %02X%02X\n",ram[dst+1],ram[dst],ram[delta+1],ram[delta]);
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c=1; // sec
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a=ram[dst]; // lda dst
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@ -222,13 +236,13 @@ copy_skip:
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a=ram[dst+1]; // lda dst+1
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sbc(ram[delta+1]); // sbc delta+1
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ram[src+1]=a; // sta src+1
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// printf("NEW SRC: %02X:%02X\n",ram[src+1],ram[src]);
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printf("\tNEW SRC: %02X%02X\n",ram[src+1],ram[src]);
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docopy(); // jsr docopy
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pla(); // pla
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ram[src]=a; // sta src
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pla(); // pla
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ram[src+1]=a; // sta src+1
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printf("RESTORED SRC: %02X%02X\n",ram[src+1],ram[src]);
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printf("\tRESTORED SRC: %02X%02X\n",ram[src+1],ram[src]);
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goto parsetoken; // jmp parsetoken
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done:
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