folkert/KEK
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

other modes with reg 7 shall not update MMR1

Browse source
This commit is contained in:
Folkert van Heusden 2025-04-12 12:30:43 +02:00
parent 62c86dfccb
commit 5b82ad260f
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
cpu.cpp
View file

@ -498,14 +498,16 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t wo
g.addr = b->read(get_register(reg), wm_word, rm_cur, isR7_space); g.addr = b->read(get_register(reg), wm_word, rm_cur, isR7_space);
// might be wrong: the adds should happen when the read is really performed, because of traps // might be wrong: the adds should happen when the read is really performed, because of traps
add_register(reg, 2); add_register(reg, 2);
g.mmr1_update = { 2, reg }; if (reg != 7)
g.mmr1_update = { 2, reg };
g.space = d_space; g.space = d_space;
if (read_value) if (read_value)
g.value = b->read(g.addr.value(), word_mode, rm_cur, g.space); g.value = b->read(g.addr.value(), word_mode, rm_cur, g.space);
break; break;
case 4: // -(Rn) case 4: // -(Rn)
add_register(reg, word_mode == wm_word || reg == 7 || reg == 6 ? -2 : -1); add_register(reg, word_mode == wm_word || reg == 7 || reg == 6 ? -2 : -1);
g.mmr1_update = { word_mode == wm_word || reg == 7 || reg == 6 ? -2 : -1, reg }; if (reg != 7)
g.mmr1_update = { word_mode == wm_word || reg == 6 ? -2 : -1, reg };
g.space = d_space; g.space = d_space;
g.addr = get_register(reg); g.addr = get_register(reg);
if (read_value) if (read_value)
@ -513,7 +515,8 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t wo
break; break;
case 5: // @-(Rn) case 5: // @-(Rn)
add_register(reg, -2); add_register(reg, -2);
g.mmr1_update = { -2, reg }; if (reg != 7)
g.mmr1_update = { -2, reg };
g.addr = b->read(get_register(reg), wm_word, rm_cur, isR7_space); g.addr = b->read(get_register(reg), wm_word, rm_cur, isR7_space);
g.space = d_space; g.space = d_space;
if (read_value) if (read_value)