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m6809: fix overflow flag problem with SBC8 and ADC8 (nw)

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This commit is contained in:
hap 2017-10-18 20:26:20 +02:00
parent d9bc537f94
commit 81bcc067e4
1 changed files with 9 additions and 9 deletions
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18
src/devices/cpu/m6809/base6x09.ops
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@ -239,8 +239,8 @@ CMP8:
return; return;
SBC8: SBC8:
m_temp.w = (uint16_t)read_operand() + (m_cc & CC_C ? 1 : 0); m_temp.b.l = read_operand();
regop8() = set_flags(CC_NZVC, regop8(), m_temp.b.l, regop8() - m_temp.w); regop8() = set_flags(CC_NZVC, regop8(), m_temp.b.l, regop8() - m_temp.b.l - (m_cc & CC_C ? 1 : 0));
return; return;
AND8: AND8:
@ -259,8 +259,8 @@ EOR8:
return; return;
ADC8: ADC8:
m_temp.w = (uint16_t)read_operand() + (m_cc & CC_C ? 1 : 0); m_temp.b.l = read_operand();
regop8() = set_flags(add8_sets_h() ? CC_HNZVC : CC_NZVC, regop8(), m_temp.b.l, regop8() + m_temp.w); regop8() = set_flags(add8_sets_h() ? CC_HNZVC : CC_NZVC, regop8(), m_temp.b.l, regop8() + m_temp.b.l + (m_cc & CC_C ? 1 : 0));
return; return;
OR8: OR8:
@ -332,9 +332,9 @@ SYNC:
// massaging the PC this way makes the debugger's behavior more // massaging the PC this way makes the debugger's behavior more
// intuitive // intuitive
m_pc.w--; m_pc.w--;
@eat_remaining(); @eat_remaining();
// unmassage... // unmassage...
m_pc.w++; m_pc.w++;
} }
@ -396,7 +396,7 @@ LBSR:
JSR: JSR:
@eat(2); @eat(2);
goto GOTO_SUBROUTINE; goto GOTO_SUBROUTINE;
GOTO_SUBROUTINE: GOTO_SUBROUTINE:
@write_memory(--m_s.w, m_pc.b.l); @write_memory(--m_s.w, m_pc.b.l);
@write_memory(--m_s.w, m_pc.b.h); @write_memory(--m_s.w, m_pc.b.h);
@ -442,7 +442,7 @@ CWAI:
m_pc.w -= 2; m_pc.w -= 2;
@eat_remaining(); @eat_remaining();
// unmassage... // unmassage...
m_pc.w += 2; m_pc.w += 2;
} }
@ -526,7 +526,7 @@ SOFTWARE_INTERRUPT:
m_temp.w = entire_state_registers(); m_temp.w = entire_state_registers();
%PUSH_REGISTERS; %PUSH_REGISTERS;
goto INTERRUPT_VECTOR; goto INTERRUPT_VECTOR;
DIRECT: DIRECT:
@set_ea(((uint16_t)m_dp << 8) | read_opcode_arg()); @set_ea(((uint16_t)m_dp << 8) | read_opcode_arg());
@eat(hd6309_native_mode() ? 0 : 1); @eat(hd6309_native_mode() ? 0 : 1);