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MFPI/MTPI require special handling for SP

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folkert van heusden 2022-06-10 20:30:00 +02:00
parent be4fbdc4ec
commit ee8d772426
1 changed files with 25 additions and 8 deletions
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33
cpu.cpp
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@ -1275,12 +1275,20 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if ((b->getMMR1() & 0160000) == 0)
b->addToMMR1(-2, 6);
// calculate address in current address space
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
// reed from previous space
uint16_t v = b -> read(a, false, true);
bool set_flags = true;
uint16_t v = 0xffff;
bool set_flags = a != 0177776;
if (dst_mode == 0)
v = getRegister(dst_reg, true);
else {
// calculate address in current address space
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
set_flags = a != 0177776;
// read from previous space
v = b -> read(a, false, true);
}
if (set_flags) {
setPSW_n(SIGN(v, false));
@ -1304,9 +1312,17 @@ bool cpu::single_operand_instructions(const uint16_t instr)
// retrieve word from '15/14'-stack
uint16_t v = popStack();
uint16_t a = getGAMAddress(dst_mode, dst_reg, false, false);
uint16_t a = 0xffff;
bool set_flags = a != 0177776;
bool set_flags = true;
if (dst_mode == 0)
setRegister(dst_reg, true, v);
else {
a = getGAMAddress(dst_mode, dst_reg, false, false);
set_flags = a != 0177776;
}
if (set_flags) {
setPSW_n(SIGN(v, false));
@ -1314,7 +1330,8 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(false);
}
b -> write(a, false, v, true); // put in '13/12' address space
if (dst_mode != 0)
b -> write(a, false, v, true); // put in '13/12' address space
break;
}