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MTPx auto increment SP and thus should update MMR1

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folkert van heusden 2023-03-24 14:15:03 +01:00
parent d0359d510f
commit 788df49a8d
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 10 additions and 8 deletions
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18
cpu.cpp
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@ -331,23 +331,23 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
uint16_t next_word = 0;
switch(mode) {
case 0: // 000
case 0: // Rn
g.reg = reg;
g.value = getRegister(reg, g.set, prev_mode) & (word_mode ? 0xff : 0xffff);
break;
case 1:
case 1: // (Rn)
g.addr = getRegister(reg, g.set, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, isR7_space);
break;
case 2:
case 2: // (Rn)+ / #n
g.addr = getRegister(reg, g.set, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, isR7_space);
addRegister(reg, prev_mode, !word_mode || reg == 7 || reg == 6 ? 2 : 1);
addToMMR1(mode, reg, word_mode);
break;
case 3:
case 3: // @(Rn)+ / @#a
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode, isR7_space);
addRegister(reg, prev_mode, 2);
if (read_value) {
@ -356,14 +356,14 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
}
addToMMR1(mode, reg, word_mode);
break;
case 4:
case 4: // -(Rn)
addRegister(reg, prev_mode, !word_mode || reg == 7 || reg == 6 ? -2 : -1);
g.addr = getRegister(reg, g.set, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, isR7_space);
addToMMR1(mode, reg, word_mode);
break;
case 5:
case 5: // @-(Rn)
addRegister(reg, prev_mode, -2);
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode, isR7_space);
if (read_value) {
@ -372,7 +372,7 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
}
addToMMR1(mode, reg, word_mode);
break;
case 6:
case 6: // x(Rn) / a
next_word = b->read(getPC(), false, prev_mode, i_space);
addRegister(7, prev_mode, + 2);
g.addr = getRegister(reg, g.set, prev_mode) + next_word;
@ -381,7 +381,7 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
g.value = b->read(g.addr.value(), word_mode, prev_mode, g.space);
}
break;
case 7:
case 7: // @x(Rn) / @a
next_word = b->read(getPC(), false, prev_mode, i_space);
addRegister(7, prev_mode, + 2);
g.addr = b->read(getRegister(reg, g.set, prev_mode) + next_word, false, prev_mode, d_space);
@ -1290,6 +1290,8 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (set_flags)
setPSW_flags_nzv(v, false);
b->addToMMR1(2, 6);
break;
}