mirror of
https://github.com/badvision/lawless-legends.git
synced 2024-12-26 04:32:05 +00:00
Add module loading to cmd, fix extraneous statements in plvm.c
This commit is contained in:
David Schmenk
parent
23ac5a36f0
commit
b496256a87
@ -1,12 +1,20 @@
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const iobuffer = $0800
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const databuff = $0C00
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byte version[] = "PLASMA VM VERSION 0.9"
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const MOD_ADDR = $1000
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byte version[] = "PLASMA VERSION 0.9"
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byte errorstr[] = "ERROR: $"
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byte okstr[] = "OK"
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byte heaperr[] = "ERR: HEAP/FRAME COLLISION.\n"
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byte prefix[32] = ""
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word heap = $6000
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byte modtbl[256]
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word lastmod = @modtbl
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byte symtbl[1024]
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word lastsym = @symtbl
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byte deftbl[2048]
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word lastdef = @deftbl
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byte perr
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word cmdptr
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;
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; Utility functions
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;
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@ -20,27 +28,7 @@ ROMEN = $C082
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LCRWEN = $C083
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LCBNK2 = $00
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LCBNK1 = $08
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;*
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;* ZERO PAGE USEAGE
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;*
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ESTKSZ = $20
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ESTK = $C0
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ESTKL = ESTK
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ESTKH = ESTK+ESTKSZ/2
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VMZP = ESTK+ESTKSZ
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IFP = VMZP
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IFPL = IFP
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IFPH = IFP+1
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IP = IFP+2
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IPL = IP
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IPH = IP+1
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IPY = IP+2
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SRC = $06
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SRCL = SRC
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SRCH = SRC+1
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DST = SRC+2
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DSTL = DST
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DSTH = DST+1
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!SOURCE "plvm02zp.inc"
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;*
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;* ASM VARIABLES
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;*
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@ -255,6 +243,22 @@ asm prbyte
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RTS
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end
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;
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; PRINT WORD
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;
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asm prword
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LDA ESTKH,X
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TAY
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LDA ESTKL,X
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STX ESP
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TAX
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TYA
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BIT ROMEN
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JSR $F941
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LDX ESP
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BIT LCRDEN+LCBNK2
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RTS
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end
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;
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; READ STRING
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; STR = RDSTR(PROMPTCHAR)
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;
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@ -289,6 +293,66 @@ asm toupper
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STA ESTKL,X
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+ RTS
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end
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asm uword_isge
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STY IPY
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LDY #$00
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LDA ESTKL+1,X
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CMP ESTKL,X
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LDA ESTKH+1,X
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SBC ESTKH,X
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+ BCC +
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DEY
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+ STY ESTKL+1,X
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STY ESTKH+1,X
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INX
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LDY IPY
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RTS
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end
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asm uword_isle
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STY IPY
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LDY #$00
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LDA ESTKL,X
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CMP ESTKL+1,X
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LDA ESTKH,X
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SBC ESTKH+1,X
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+ BCC +
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DEY
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+ STY ESTKL+1,X
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STY ESTKH+1,X
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INX
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LDY IPY
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RTS
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end
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asm uword_isgt
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STY IPY
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LDY #$FF
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LDA ESTKL,X
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CMP ESTKL+1,X
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LDA ESTKH,X
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SBC ESTKH+1,X
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+ BCC +
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INY
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+ STY ESTKL+1,X
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STY ESTKH+1,X
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INX
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LDY IPY
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RTS
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end
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asm uword_islt
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STY IPY
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LDY #$FF
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LDA ESTKL+1,X
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CMP ESTKL,X
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LDA ESTKH+1,X
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SBC ESTKH,X
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+ BCC +
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INY
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+ STY ESTKL+1,X
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STY ESTKH+1,X
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INX
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LDY IPY
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RTS
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end
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def crout
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cout($0D)
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end
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@ -350,6 +414,356 @@ def read(refnum, buff, len)
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perr = prodos($CA, @params)
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return params:6
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end
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;
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; Utility routines.
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;
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; A DCI string is one that has the high bit set for every character except the last.
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; More efficient than C or Pascal strings.
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;
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def dcitos(dci, str)
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byte len
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len = 0
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repeat
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str.[len] = dci.[len] & $7F
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len = len + 1
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until len > 15 or !(dci.[len - 1] & $80)
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str.[len] = 0
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return len
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end
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def stodci(str, dci)
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byte len
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len = 0
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while len < 16 and str.[len]
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dci.[len] = toupper(str.[len]) | $80
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len = len + 1
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loop
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dci.[len - 1] = dci.[len - 1] & $7F;
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return len;
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end
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;
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; Heap routines.
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;
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def avail_heap
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byte fp
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return @fp - heap
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end
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def alloc_heap(size)
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word addr
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addr = heap
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heap = heap + size
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; if heap >= @addr
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; puts(@heaperr)
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; exit(1)
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; fin
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return addr
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end
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def free_heap(size)
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heap = heap - size;
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return @size - heap;
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end
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def mark_heap
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return heap;
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end
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def release_heap(newheap)
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heap = newheap;
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return @newheap - heap;
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end
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;def avail_xheap(void)
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; return 0xC000 - xheap;
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;end
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;def alloc_xheap(int size)
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; uword addr = xheap;
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; xheap += size;
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; if (xheap >= 0xC000)
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; {
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; printf("Error: xheap extinguished.\n");
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; exit (1);
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; }
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; return addr;
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;end
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;def free_xheap(int size)
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; xheap -= size;
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; return 0xC000 - heap;
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;end
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;def mark_xheap(void)
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; return xheap;
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;end
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;def release_xheap(uword newxheap)
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; xheap = newxheap;
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; return 0xC000 - xheap;
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;end
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;
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; Copy from data mem to code mem.
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;
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;def xmemcpy(uword src, uword dst, uword size)
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; while (size--)
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; mem_code[dst + size] = mem_data[src + size];
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;end
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;
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; Copy from code mem to data mem.
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;
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;def memxcpy(uword src, uword dst, uword size)
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; while (size--)
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; mem_data[dst + size] = mem_code[src + size];
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;end
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;
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; DCI table routines,
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;
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def dump_tbl(tbl)
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byte len
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word entbl
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while ^tbl
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len = 0
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while ^tbl & $80
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cout(^tbl & $7F)
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tbl = tbl + 1
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len = len + 1
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loop
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cout(^tbl)
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tbl = tbl + 1
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cout(':')
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while len < 15
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cout(' ')
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len = len + 1
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loop
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cout('$')
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prbyte((tbl).1)
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prbyte((tbl).0)
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tbl = tbl + 2
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loop
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end
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def lookup_tbl(dci, tbl)
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byte str[20]
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word match, entry
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entry = tbl
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while ^entry
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match = dci
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while ^entry == ^match
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if !(^entry & $80)
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return (entry):1
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fin
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entry = entry + 1
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match = match + 1
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loop
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while ^entry & $80
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entry = entry + 1
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loop
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entry = entry + 2
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loop
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return 0
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end
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def add_tbl(dci, val, last)
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while ^dci & $80
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^(*last) = ^dci
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*last = *last + 1
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dci = dci + 1
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loop
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^(*last) = ^dci
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*last = *last + 1
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dci = dci + 1
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^(*last) = val
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*last = *last + 2
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end
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;
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; Symbol table routines.
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;
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def dump_sym
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;printf("\nSystem Symbol Table:\n");
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dump_tbl(symtbl)
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end
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def lookup_sym(sym)
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return lookup_tbl(sym, symtbl)
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end
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def add_sym(sym, addr)
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return add_tbl(sym, addr, @lastsym);
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end
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;
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; Module routines.
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;
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def dump_mod
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;printf("\nSystem Module Table:\n");
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dump_tbl(modtbl)
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end
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def lookup_mod(mod)
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return lookup_tbl(mod, modtbl)
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end
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def add_mod(mod, addr)
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return add_tbl(mod, addr, @lastmod)
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end
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def defcall_add(bank, addr)
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(lastdef).0 = $20 ; JSR $03D6
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(lastdef):1 = $03D6
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(lastdef).3 = bank
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(lastdef):4 = addr
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lastdef = lastdef + 6
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end
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def def_lookup(cdd, defaddr)
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word i
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i = 0
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while (cdd).[i] == $02
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if (cdd):[i + 1] == defaddr)
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return cdd + i
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fin
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i = i + 4
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loop
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return 0
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end
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def extern_lookup(esd, index)
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word sym
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byte str[17]
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while ^esd
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sym = esd;
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esd = esd + dcitos(esd, str)
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if (esd).0 & $10 and (esd).1 == index
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return lookup_sym(sym)
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fin
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esd = esd + 3
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loop
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return 0
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end
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def load_mod(mod)
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word refnum, len, size,modend, bytecode, fixup, addr, init, modaddr, modfix
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word moddep, rld, esd, cdd, sym;
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byte header[128]
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byte filename[32]
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byte str[17]
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init = 0
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modaddr = mark_heap
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dcitos(mod, filename)
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;printf("Load module %s\n", filename)
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refnum = open(filename)
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if refnum > 0
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len = read(refnum, @header, 128)
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if len > 4 and header:2 == $DA7E ; DAVE
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;
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; This is a relocatable bytecode module.
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;
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bytecode = header:4
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init = header:6
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moddep = @header + 8
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if ^moddep
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;
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; Load module dependencies.
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;
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close(refnum)
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while ^moddep
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if lookup_mod(moddep) == 0
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load_mod(moddep)
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fin
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moddep = moddep + dcitos(moddep, str)
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loop
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modaddr = mark_heap
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refnum = open(filename)
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len = read(refnum, modaddr, 128)
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fin
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else
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memcpy(modaddr, header, len)
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fin
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addr = modaddr + len;
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repeat
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len = read(refnum, addr, 4096)
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addr = addr + len
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until len > 0
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close(refnum)
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size = addr - modaddr
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len = *modaddr
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modend = modaddr + len
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modfix = modaddr - MOD_ADDR
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bytecode = bytecode + modfix
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rld = modaddr + len ; Re-Locatable Directory
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cdd = rld ; Code Definition Directory
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esd = rld ; Extern+Entry Symbol Directory
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while ^esd <> $00 ; Scan to end of RLD
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esd = esd + 4
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loop
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esd = esd + 1
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;if show_state
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;
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; Dump different parts of module.
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;
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;printf("Module size: %d\n", size);
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;printf("Module code+data size: %d\n", len);
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;printf("Module magic: $%04X\n", magic);
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;printf("Module bytecode: $%04X\n", bytecode);
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;printf("Module init: $%04X\n", init);
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;fin
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;
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; Print out the Re-Location Dictionary.
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;
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;if show_state
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;printf("\nRe-Location Dictionary:\n")
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;fin
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while ^rld
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if ^rld == $02
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;if show_state prstr("\tDEF CODE")
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(rld):1 = (rld):1 + modfix
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modend = rld + 4
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else
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addr = (rld):1 + modfix
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if (rld).0 & $80
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fixup = *addr
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else
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fixup = ^addr
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fin
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if (^rld & $10)
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;if show_state printf("\tEXTERN[$%02X] ", rld[3]);
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fixup = fixup + extern_lookup(esd, rld[3]);
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else
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;if (show_state) printf("\tINTERN ")
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fixup = fixup + modfix
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if uword_isge(fixup, bytecode)
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;
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; Replace with call def dictionary.
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;
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fixup = def_lookup(cdd, fixup)
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fin
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fin
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if ^rld & $80
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;if show_state printf("WORD")
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*addr = fixup
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else
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;if show_state printf("BYTE")
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^addr = fixup
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fin
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fin
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;if show_state printf("@$%04X\n", addr)
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rld = rld + 4;
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loop
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;if show_state printf("\nExternal/Entry Symbol Directory:\n")
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while ^esd
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sym = esd
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esd = esd + dcitos(esd, str)
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if ^esd & $10
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;if show_state printf("\tIMPORT %s[$%02X]\n", string, esd[1])
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elsif ^esd & $08
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addr = (esd):1 + modfix
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;if show_state printf("\tEXPORT %s@$%04X\n", string, addr)
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if uword_isge(addr, bytecode)
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addr = def_lookup(cdd, addr)
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fin
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add_sym(sym, addr)
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fin
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esd = esd + 3
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loop
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else
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;printf("Error: Unable to load module %s\n", filename);
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return -1
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fin
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;
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; Reserve heap space for relocated module.
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;
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alloc_heap(modend - modaddr)
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;
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; Call init routine.
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;
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if init
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return (init + modfix)()
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fin
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return 0
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end
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;
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; Command mode
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;
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@ -504,9 +918,49 @@ def execsys(sysfile)
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fin
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end
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def prucomp(a, b)
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if uword_isgt(a, b)
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prword(a)
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cout('>')
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prword(b)
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crout
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fin
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if uword_isge(a, b)
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prword(a)
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cout('>')
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cout('=')
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prword(b)
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crout
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fin
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if uword_islt(a, b)
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prword(a)
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cout('<')
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prword(b)
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crout
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fin
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if uword_isle(a, b)
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prword(a)
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cout('<')
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cout('=')
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prword(b)
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crout
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fin
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end
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resetmemfiles()
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prstr(@version)
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crout()
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prucomp($1, $2)
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prucomp($2, $1)
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prucomp($100, $200)
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prucomp($200, $100)
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prucomp($9000, $A000)
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prucomp($A000, $9000)
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prucomp($E000, $E000)
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prucomp($E001, $E000)
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prucomp($E000, $E001)
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prucomp($FFFF, $FFFE)
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prucomp($FFFE, $FFFF)
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||||
while 1
|
||||
prstr(getpfx(@prefix))
|
||||
cmdptr = rdstr($BA)
|
||||
|
||||
@ -191,10 +191,9 @@ uword lookup_tbl(byte *dci, byte *tbl)
|
||||
while (*entry++ & 0x80);
|
||||
entry += 2;
|
||||
}
|
||||
dcitos(dci, str);
|
||||
return 0;
|
||||
}
|
||||
int add_tbl(byte *dci, int val, byte *tbl, byte **last)
|
||||
int add_tbl(byte *dci, int val, byte **last)
|
||||
{
|
||||
while (*dci & 0x80)
|
||||
*(*last)++ = *dci++;
|
||||
@ -217,7 +216,7 @@ uword lookup_sym(byte *sym)
|
||||
}
|
||||
int add_sym(byte *sym, int addr)
|
||||
{
|
||||
return add_tbl(sym, addr, symtbl, &lastsym);
|
||||
return add_tbl(sym, addr, &lastsym);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -234,7 +233,7 @@ uword lookup_mod(byte *mod)
|
||||
}
|
||||
int add_mod(byte *mod, int addr)
|
||||
{
|
||||
return add_tbl(mod, addr, symtbl, &lastmod);
|
||||
return add_tbl(mod, addr, &lastmod);
|
||||
}
|
||||
defcall_add(int bank, int addr)
|
||||
{
|
||||
|
||||
@ -29,36 +29,7 @@ ALTRDOFF= $C002
|
||||
ALTRDON = $C003
|
||||
ALTWROFF= $C004
|
||||
ALTWRON = $C005
|
||||
;**********************************************************
|
||||
;*
|
||||
;* VM ZERO PAGE LOCATIONS
|
||||
;*
|
||||
;**********************************************************
|
||||
ESTKSZ = $20
|
||||
ESTK = $C0
|
||||
ESTKL = ESTK
|
||||
ESTKH = ESTK+ESTKSZ/2
|
||||
VMZP = ESTK+ESTKSZ
|
||||
IFP = VMZP
|
||||
IFPL = IFP
|
||||
IFPH = IFP+1
|
||||
IP = IFP+2
|
||||
IPL = IP
|
||||
IPH = IP+1
|
||||
IPY = IP+2
|
||||
TMP = IP+3
|
||||
TMPL = TMP
|
||||
TMPH = TMP+1
|
||||
TMPX = TMP+2
|
||||
NPARMS = TMPL
|
||||
FRMSZ = TMPH
|
||||
DVSIGN = TMPX
|
||||
SRC = $06
|
||||
SRCL = SRC
|
||||
SRCH = SRC+1
|
||||
DST = SRC+2
|
||||
DSTL = DST
|
||||
DSTH = DST+1
|
||||
!SOURCE "plvm02zp.inc"
|
||||
ESP = DST+2
|
||||
;**********************************************************
|
||||
;*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user