Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-19 15:11:37 +03:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity

m6809: Improve accuracy of dummy fetch patterns

Browse Source
This commit is contained in:
AJR 2021-02-08 12:04:16 -05:00
parent b13d4347de
commit 44e300c639
2 changed files with 48 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
src/devices/cpu/m6809/base6x09.ops
View File

@ -2,17 +2,22 @@
// copyright-holders:Nathan Woods
NMI:
m_nmi_asserted = false;
@dummy_read_opcode_arg(0);
@dummy_read_opcode_arg(0);
@dummy_vma(1);
m_cc |= CC_E;
set_regop16(m_s);
m_temp.w = entire_state_registers();
%PUSH_REGISTERS;
m_cc |= CC_I | CC_F;
set_ea(VECTOR_NMI);
eat(1);
standard_irq_callback(INPUT_LINE_NMI);
goto INTERRUPT_VECTOR;
FIRQ:
@dummy_read_opcode_arg(0);
@dummy_read_opcode_arg(0);
@dummy_vma(1);
if (firq_saves_entire_state())
{
m_cc |= CC_E;
@ -27,25 +32,27 @@ FIRQ:
%PUSH_REGISTERS;
m_cc |= CC_I | CC_F;
set_ea(VECTOR_FIRQ);
eat(1);
standard_irq_callback(M6809_FIRQ_LINE);
goto INTERRUPT_VECTOR;
IRQ:
@dummy_read_opcode_arg(0);
@dummy_read_opcode_arg(0);
@dummy_vma(1);
m_cc |= CC_E;
set_regop16(m_s);
m_temp.w = entire_state_registers();
%PUSH_REGISTERS;
m_cc |= CC_I;
set_ea(VECTOR_IRQ);
eat(1);
standard_irq_callback(M6809_IRQ_LINE);
goto INTERRUPT_VECTOR;
INTERRUPT_VECTOR:
@eat(4);
@dummy_vma(1);
@m_pc.b.h = read_operand(0); // Not sure if this is cycle exact
@m_pc.b.l = read_operand(1); // Not sure if this is cycle exact
@dummy_vma(1);
return;
NEG8:
@ -406,7 +413,7 @@ SYNC:
// SYNC stops processing instructions until an interrupt request happens.
// This doesn't require the corresponding interrupt to be enabled: if it
// is disabled, execution continues with the next instruction.
eat(3);
@dummy_read_opcode_arg(0);
while(!m_nmi_asserted && !m_firq_line && !m_irq_line)
{
@ -439,7 +446,10 @@ ORCC:
ANDCC:
m_cc &= read_operand();
eat(1);
if(!hd6309_native_mode()) {
@dummy_read_opcode_arg(0);
;
}
return;
SEX:
@ -506,7 +516,7 @@ GOTO_SUBROUTINE:
RTS:
m_temp.w = 0x80; // RTS is equivalent to "PULS PC"
if(!hd6309_native_mode()) {
@dummy_vma(1);
@dummy_read_opcode_arg(0);
;
}
set_regop16(m_s);
@ -528,6 +538,7 @@ MUL:
return;
RTI:
@dummy_read_opcode_arg(0);
set_regop16(m_s);
m_temp.w = 0x01; // PULS CC
%PULL_REGISTERS;
@ -587,25 +598,33 @@ LEA_us:
PSHS:
@m_temp.w = read_opcode_arg();
@eat(hd6309_native_mode() ? 2 : 3);
@dummy_vma(2);
set_regop16(m_s);
if(!hd6309_native_mode() {
@(void)read_memory(regop16().w);
;
}
goto PUSH_REGISTERS;
PULS:
@m_temp.w = read_opcode_arg();
@eat(hd6309_native_mode() ? 1 : 2);
@dummy_vma(hd6309_native_mode() ? 1 : 2);
set_regop16(m_s);
goto PULL_REGISTERS;
PSHU:
@m_temp.w = read_opcode_arg();
@eat(hd6309_native_mode() ? 2 : 3);
@dummy_vma(2);
set_regop16(m_u);
if(!hd6309_native_mode() {
@(void)read_memory(regop16().w);
;
}
goto PUSH_REGISTERS;
PULU:
@m_temp.w = read_opcode_arg();
@eat(hd6309_native_mode() ? 1 : 2);
@dummy_vma(hd6309_native_mode() ? 1 : 2);
set_regop16(m_u);
goto PULL_REGISTERS;
@ -617,6 +636,8 @@ SWI:
m_cc |= CC_E;
set_regop16(m_s);
m_temp.w = entire_state_registers();
@dummy_read_opcode_arg(0);
@dummy_vma(1);
%PUSH_REGISTERS;
m_cc |= CC_I | CC_F;
goto INTERRUPT_VECTOR;
@ -636,6 +657,8 @@ SOFTWARE_INTERRUPT:
m_cc |= CC_E;
set_regop16(m_s);
m_temp.w = entire_state_registers();
@dummy_read_opcode_arg(0);
@dummy_vma(1);
%PUSH_REGISTERS;
goto INTERRUPT_VECTOR;
@ -650,5 +673,8 @@ DIRECT:
EXTENDED:
@set_ea_h(read_opcode_arg());
@set_ea_l(read_opcode_arg());
@eat(hd6309_native_mode() ? 0 : 1);
if(!hd6309_native_mode()) {
@dummy_vma(1);
;
}
return;

21
src/devices/cpu/m6809/m6809.ops
View File

@ -434,7 +434,7 @@ PULL_REGISTERS:
@m_pc.b.l = read_memory(regop16().w++);
nop();
}
@eat(1);
@(void)read_memory(regop16().w);
return;
INDEXED:
@ -506,22 +506,22 @@ INDEXED:
@m_temp.b.h = read_opcode_arg();
@m_temp.b.l = read_opcode_arg();
m_temp.w = ireg() + m_temp.w;
@dummy_read_opcode_arg(0);
@dummy_vma(2);
@dummy_vma(3);
break;
case 0x0B: case 0x2B: case 0x4B: case 0x6B:
case 0x1B: case 0x3B: case 0x5B: case 0x7B:
m_temp.w = ireg() + m_q.r.d;
@dummy_read_opcode_arg(0);
@dummy_vma(4);
@dummy_read_opcode_arg(1);
@dummy_vma(3);
break;
case 0x0C: case 0x2C: case 0x4C: case 0x6C:
case 0x1C: case 0x3C: case 0x5C: case 0x7C:
@m_temp.b.l = read_opcode_arg();
m_temp.w = m_pc.w + (int8_t) m_temp.b.l;
@dummy_read_opcode_arg(0);
@dummy_vma(1);
break;
case 0x0D: case 0x2D: case 0x4D: case 0x6D:
@ -529,15 +529,14 @@ INDEXED:
@m_temp.b.h = read_opcode_arg();
@m_temp.b.l = read_opcode_arg();
m_temp.w = m_pc.w + (int16_t) m_temp.w;
@dummy_read_opcode_arg(0);
@dummy_vma(3);
@dummy_vma(4);
break;
case 0x0F: case 0x2F: case 0x4F: case 0x6F:
case 0x1F: case 0x3F: case 0x5F: case 0x7F:
@m_temp.b.h = read_opcode_arg();
@m_temp.b.l = read_opcode_arg();
@dummy_read_opcode_arg(0);
@dummy_vma(1);
break;
default:
@ -551,7 +550,7 @@ INDEXED:
set_ea(m_temp.w);
@m_temp.b.h = read_operand(0);
@m_temp.b.l = read_operand(1);
eat(1);
@dummy_vma(1);
}
}
else
@ -573,7 +572,7 @@ EXG:
write_exgtfr_register(param >> 4, reg2);
write_exgtfr_register(param >> 0, reg1);
}
eat(hd6309_native_mode() ? 3 : 6);
@dummy_vma(hd6309_native_mode() ? 3 : 6);
return;
TFR:
@ -585,7 +584,7 @@ TFR:
m_lds_encountered = true;
}
}
eat(hd6309_native_mode() ? 2 : 4);
@dummy_vma(hd6309_native_mode() ? 2 : 4);
return;
ILLEGAL: