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use d-space where required

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This commit is contained in:
folkert van heusden 2023-03-18 14:45:44 +01:00
parent be68ad2357
commit a935fe44d7
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
3 changed files with 17 additions and 9 deletions
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5
bus.cpp
View file

@ -464,6 +464,11 @@ void bus::check_address(const bool trap_on_failure, const bool is_write, const m
}
}
bool bus::get_use_data_space(const int run_mode)
{
return !!(MMR3 & di_ena_mask[run_mode]);
}
uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, const bool trap_on_failure, const bool is_write, const bool peek_only, const bool is_data)
{
uint32_t m_offset = a;

1
bus.h
View file

@ -150,6 +150,7 @@ public:
uint32_t calculate_physical_address(const int run_mode, const uint16_t a, const bool trap_on_failure, const bool is_write, const bool peek_only, const bool is_data);
bool get_use_data_space(const int run_mode);
memory_addresses_t calculate_physical_address(const int run_mode, const uint16_t a);
void check_address(const bool trap_on_failure, const bool is_write, const memory_addresses_t & addr, const bool word_mode, const bool is_data, const int run_mode);
};

20
cpu.cpp
View file

@ -331,6 +331,8 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
uint16_t next_word = 0;
d_i_space_t space = reg == 7 ? i_space : (b->get_use_data_space(psw >> 14) ? d_space : i_space);
switch(mode) {
case 0: // 000
g.reg = reg;
@ -339,45 +341,45 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
case 1:
g.addr = getRegister(reg, g.set, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode);
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, space);
break;
case 2:
g.addr = getRegister(reg, g.set, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode);
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, space);
addRegister(reg, prev_mode, !word_mode || reg == 7 || reg == 6 ? 2 : 1);
break;
case 3:
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode);
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode, space);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode);
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, d_space);
addRegister(reg, prev_mode, 2);
break;
case 4:
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);
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, d_space);
break;
case 5:
addRegister(reg, prev_mode, -2);
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode);
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode, space);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode);
g.value = b->read(g.addr.value(), word_mode, prev_mode, d_space);
break;
case 6:
next_word = b -> read(getPC(), false, prev_mode);
addRegister(7, prev_mode, + 2);
g.addr = getRegister(reg, g.set, prev_mode) + next_word;
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode);
g.value = b->read(g.addr.value(), word_mode, prev_mode, d_space);
break;
case 7:
next_word = b -> read(getPC(), false, prev_mode);
addRegister(7, prev_mode, + 2);
g.addr = b->read(getRegister(reg, g.set, prev_mode) + next_word, false, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode);
g.value = b->read(g.addr.value(), word_mode, prev_mode, d_space);
break;
}