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fixed double bus error detection by only setting the run mode after fetching the opcode

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This commit is contained in:
smf- 2011-10-14 14:47:46 +00:00
parent 5dbd34cc34
commit 0e9f1ce838
1 changed files with 3 additions and 2 deletions
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5
src/emu/cpu/m68000/m68kcpu.c
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@ -823,15 +823,14 @@ static CPU_EXECUTE( m68k )
if (!m68k->pmmu_enabled)
{
m68k->run_mode = RUN_MODE_NORMAL;
/* Read an instruction and call its handler */
m68k->ir = m68ki_read_imm_16(m68k);
m68k->run_mode = RUN_MODE_NORMAL;
m68k->jump_table[m68k->ir](m68k);
m68k->remaining_cycles -= m68k->cyc_instruction[m68k->ir];
}
else
{
m68k->run_mode = RUN_MODE_NORMAL;
// save CPU address registers values at start of instruction
int i;
UINT32 tmp_dar[16];
@ -845,6 +844,7 @@ static CPU_EXECUTE( m68k )
/* Read an instruction and call its handler */
m68k->ir = m68ki_read_imm_16(m68k);
m68k->run_mode = RUN_MODE_NORMAL;
if (!m68k->mmu_tmp_buserror_occurred)
{
@ -895,6 +895,7 @@ static CPU_EXECUTE( m68k )
}
}
/* Trace m68k_exception, if necessary */
m68ki_exception_if_trace(m68k); /* auto-disable (see m68kcpu.h) */
} while (m68k->remaining_cycles > 0);