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zasm: add RST instruction
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commit
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@ -58,13 +58,14 @@
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.equ I_RRA 0x33
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.equ I_RRC 0x34
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.equ I_RRCA 0x35
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.equ I_SBC 0x36
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.equ I_SCF 0x37
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.equ I_SET 0x38
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.equ I_SLA 0x39
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.equ I_SRL 0x3a
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.equ I_SUB 0x3b
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.equ I_XOR 0x3c
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.equ I_RST 0x36
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.equ I_SBC 0x37
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.equ I_SCF 0x38
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.equ I_SET 0x39
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.equ I_SLA 0x3a
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.equ I_SRL 0x3b
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.equ I_SUB 0x3c
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.equ I_XOR 0x3d
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; *** Variables ***
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; Args are 3 bytes: argspec, then values of numerical constants (when that's
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@ -555,6 +556,26 @@ handleLDrr:
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ld c, 1
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ret
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handleRST:
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ld a, (INS_CURARG1+1)
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; verify that A is either 0x08, 0x10, 0x18, 0x20, 0x28, 0x30 or 0x38.
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; Good news: they're all multiples of 8.
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; to verify that we're within range, we to 8-bit rotation. If any of
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; the first 3 bytes are set (thus not a multiple of 8), the cp 8
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; later will yield NC because those bits will now be upwards.
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rrca \ rrca \ rrca
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cp 8
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jr nc, .error
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; good, we have a proper arg. Now let's get those 3 bits in position
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rlca \ rlca \ rlca
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or 0b11000111
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ld (INS_UPCODE), a
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ld c, 1
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ret
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.error:
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ld c, 0
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ret
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; Compute the upcode for argspec row at (DE) and arguments in curArg{1,2} and
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; writes the resulting upcode to IO.
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; A is zero, with Z set, on success. A is non-zero, with Z unset, on error.
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@ -1045,6 +1066,7 @@ instrNames:
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.db "RRA", 0
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.db "RRC", 0
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.db "RRCA"
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.db "RST", 0
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.db "SBC", 0
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.db "SCF", 0
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.db "SET", 0
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@ -1214,6 +1236,7 @@ instrTBlRET:
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.db I_RRA, 0, 0, 0, 0x1f , 0 ; RRA
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.db I_RRC, 0xb, 0,0x40, 0xcb, 0b00001000 ; RRC r
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.db I_RRCA,0, 0, 0, 0x0f , 0 ; RRCA
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.db I_RST, 'n', 0, 0x20 \ .dw handleRST ; RST p
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.db I_SBC, 'A', 'l', 0, 0x9e , 0 ; SBC A, (HL)
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.db I_SBC, 'A', 0xb, 0, 0b10011000 , 0 ; SBC A, r
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.db I_SBC,'h',0x3,0x44, 0xed, 0b01000010 ; SBC HL, ss
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@ -1797,6 +1797,14 @@ RRC H
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RRC L
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RRC A
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RRCA
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RST 0
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RST 8
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RST 16
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RST 24
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RST 32
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RST 40
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RST 48
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RST 56
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SBC A, (HL)
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SBC A, B
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SBC A, C
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@ -84,9 +84,10 @@ def getDbLines(fp, tblname):
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line = fp.readline()
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while line:
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line = cleanupLine(line)
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if line:
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if not line.startswith('.db'):
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break
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if line == '.db 0xff':
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break
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# skip index labels lines
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if line.startswith('.db'):
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result.append([s.strip() for s in line[4:].split(',')])
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line = fp.readline()
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return result
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@ -151,6 +152,8 @@ def main():
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args1 = eargs(args1)
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if n == 'IM':
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args1 = [0, 1, 2]
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if n == 'RST':
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args1 = [i*8 for i in range(8)]
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if args1:
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for arg1 in args1:
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args2 = genargs(a2)
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