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implemented NEG

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FeralChild64 committed 2020-12-22 21:09:18 +01:00
1 parent 363b198a03
commit beedad3377
4 files changed
+42 -9
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src/zvm_m65/z80_instr_general.s
+17 -1
View File
@@ -56,7 +56,23 @@ Z80_instr_2F: ;
sta REG_F
jmp ZVM_next
; XXX put NEG here
Z80_instr_ED_44: ; NEG
Z80_illeg_ED_4C: ; NEG
Z80_illeg_ED_54: ; NEG
Z80_illeg_ED_5C: ; NEG
Z80_illeg_ED_64: ; NEG
Z80_illeg_ED_6C: ; NEG
Z80_illeg_ED_74: ; NEG
Z80_illeg_ED_7C: ; NEG
ldx REG_A
lda z80_ftable_NEG, x
sta REG_F
lda #$00
sec
sbc REG_A
sta REG_A
jmp ZVM_next
Z80_instr_3F: ; CCF
src/zvm_m65/z80_tables.s
+4
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@@ -29,6 +29,10 @@ z80_ftable_IN_OR_XOR:
+PUT_Z80_FTABLE_IN_OR_XOR
z80_ftable_NEG:
+PUT_Z80_FTABLE_NEG
;
; That horrific DAA instruction
;
src/zvm_m65/zvm_core.s
-8
View File
@@ -270,7 +270,6 @@ Z80_instr_DD_E3: ; EX (SP),IX
Z80_instr_DD_F9: ; LD SP,IX
Z80_instr_ED_42: ; SBC HL,BC
Z80_instr_ED_43: ; LD (nn),BC
Z80_instr_ED_44: ; NEG
Z80_instr_ED_45: ; RETN
Z80_instr_ED_4A: ; ADC HL,BC
Z80_instr_ED_4B: ; LD BC,(nn)
@@ -345,20 +344,13 @@ Z80_illeg_CB_34: ; SLL H
Z80_illeg_CB_35: ; SLL L
Z80_illeg_CB_36: ; SLL (HL)
Z80_illeg_CB_37: ; SLL A
Z80_illeg_ED_4C: ; NEG
Z80_illeg_ED_54: ; NEG
Z80_illeg_ED_55: ; RETN
Z80_illeg_ED_5C: ; NEG
Z80_illeg_ED_5D: ; RETN
Z80_illeg_ED_64: ; NEG
Z80_illeg_ED_65: ; RETN
Z80_illeg_ED_6C: ; NEG
Z80_illeg_ED_6D: ; RETN
Z80_illeg_ED_70: ; IN F,(C)
Z80_illeg_ED_71: ; OUT (C),0
Z80_illeg_ED_74: ; NEG
Z80_illeg_ED_75: ; RETN
Z80_illeg_ED_7C: ; NEG
Z80_illeg_ED_7D: ; RETN
Z80_illeg_xDCB_C0: ; SET 0,(IXY+d),B
Z80_illeg_xDCB_C1: ; SET 0,(IXY+d),C
tools/generate_z80_tables.cc
+21
View File
@@ -210,6 +210,26 @@ std::string generateInOrXorTable(void)
return outStr.str() + "}\n\n\n";
}
std::string generateNegTable(void)
{
std::stringstream outStr;
outStr << "!macro PUT_Z80_FTABLE_NEG {\n";
for (uint16_t idx = 0; idx < 0x100; idx++)
{
uint8_t flags = Z80_NF;
if (0 - idx >= 0x80) flags |= Z80_SF;
if (idx == 0) flags |= Z80_ZF;
if (idx != 0) flags |= Z80_HF | Z80_CF;
if (idx == 0x80) flags |= Z80_VF;
if ((0 - idx) & 0x08) flags |= Z80_XF;
if ((0 - idx) & 0x20) flags |= Z80_YF;
outStr << "\t!byte $" << std::hex << std::setw(2) << std::setfill('0') << int(flags) << "\n";
}
return outStr.str() + "}\n\n\n";
}
typedef struct FlagsDAA
@@ -333,6 +353,7 @@ void writeTables()
outFile << generateDecTable();
outFile << generateAndTable();
outFile << generateInOrXorTable();
outFile << generateNegTable();
outFile << generateDaaTables();
// XXX