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added m6809 config option to control where opcodes 10 and 11 fetch the second byte.

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The disassembler needs to respect the setting too but I don't know how to inform it.
This commit is contained in:
Nicola Salmoria 2008-11-16 12:21:58 +00:00
parent c675126853
commit 6aabfb37cb
4 changed files with 77 additions and 59 deletions
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2
src/emu/cpu/m6809/6809dasm.c
View File

@ -374,6 +374,8 @@ CPU_DISASSEMBLE( m6809 )
do
{
opcode = oprom[p++];
// FIXME if (m68_state->config->encrypt_only_first_byte) we should to this
// opcode = page == 0 ? oprom[p++] : opram[p++];
for (i = 0; i < m6809_numops[page]; i++)
if (m6809_pgpointers[page][i].opcode == opcode)
break;

6
src/emu/cpu/m6809/6809ops.c
View File

@ -12,7 +12,7 @@ HNZVC
*/
#define OP_HANDLER(_name) INLINE void _name (m68_state_t *m68_state)
#define OP_HANDLER(_name) INLINE void _name (m68_state_t *m68_state)
#ifdef NEW
static void illegal )
@ -2913,7 +2913,7 @@ OP_HANDLER( sts_ex )
/* $10xx opcodes */
OP_HANDLER( pref10 )
{
UINT8 ireg2 = ROP(PCD);
UINT8 ireg2 = m68_state->config->encrypt_only_first_byte ? ROP_ARG(PCD) : ROP(PCD);
PC++;
switch( ireg2 )
{
@ -2974,7 +2974,7 @@ OP_HANDLER( pref10 )
/* $11xx opcodes */
OP_HANDLER( pref11 )
{
UINT8 ireg2 = ROP(PCD);
UINT8 ireg2 = m68_state->config->encrypt_only_first_byte ? ROP_ARG(PCD) : ROP(PCD);
PC++;
switch( ireg2 )
{

121
src/emu/cpu/m6809/m6809.c
View File

@ -98,6 +98,7 @@ struct _m68_state_t
int extra_cycles; /* cycles used up by interrupts */
cpu_irq_callback irq_callback;
const device_config *device;
const m6809_config *config;
UINT8 int_state; /* SYNC and CWAI flags */
UINT8 nmi_state;
};
@ -279,57 +280,57 @@ static void UpdateState(m68_state_t *m68_state)
static void CHECK_IRQ_LINES(m68_state_t *m68_state)
{
if( m68_state->irq_state[M6809_IRQ_LINE] != CLEAR_LINE ||
m68_state->irq_state[M6809_FIRQ_LINE] != CLEAR_LINE )
m68_state->int_state &= ~M6809_SYNC; /* clear SYNC flag */
if( m68_state->irq_state[M6809_FIRQ_LINE]!=CLEAR_LINE && !(CC & CC_IF) )
{
/* fast IRQ */
/* HJB 990225: state already saved by CWAI? */
if( m68_state->int_state & M6809_CWAI )
{
m68_state->int_state &= ~M6809_CWAI; /* clear CWAI */
m68_state->extra_cycles += 7; /* subtract +7 cycles */
}
else
{
CC &= ~CC_E; /* save 'short' state */
PUSHWORD(pPC);
PUSHBYTE(CC);
m68_state->extra_cycles += 10; /* subtract +10 cycles */
}
CC |= CC_IF | CC_II; /* inhibit FIRQ and IRQ */
PCD=RM16(0xfff6);
CHANGE_PC;
(void)(*m68_state->irq_callback)(m68_state->device, M6809_FIRQ_LINE);
}
else
if( m68_state->irq_state[M6809_IRQ_LINE]!=CLEAR_LINE && !(CC & CC_II) )
{
/* standard IRQ */
/* HJB 990225: state already saved by CWAI? */
if( m68_state->int_state & M6809_CWAI )
{
m68_state->int_state &= ~M6809_CWAI; /* clear CWAI flag */
m68_state->extra_cycles += 7; /* subtract +7 cycles */
}
else
{
CC |= CC_E; /* save entire state */
PUSHWORD(pPC);
PUSHWORD(pU);
PUSHWORD(pY);
PUSHWORD(pX);
PUSHBYTE(DP);
PUSHBYTE(B);
PUSHBYTE(A);
PUSHBYTE(CC);
m68_state->extra_cycles += 19; /* subtract +19 cycles */
}
CC |= CC_II; /* inhibit IRQ */
PCD=RM16(0xfff8);
CHANGE_PC;
(void)(*m68_state->irq_callback)(m68_state->device, M6809_IRQ_LINE);
if( m68_state->irq_state[M6809_IRQ_LINE] != CLEAR_LINE ||
m68_state->irq_state[M6809_FIRQ_LINE] != CLEAR_LINE )
m68_state->int_state &= ~M6809_SYNC; /* clear SYNC flag */
if( m68_state->irq_state[M6809_FIRQ_LINE]!=CLEAR_LINE && !(CC & CC_IF) )
{
/* fast IRQ */
/* HJB 990225: state already saved by CWAI? */
if( m68_state->int_state & M6809_CWAI )
{
m68_state->int_state &= ~M6809_CWAI; /* clear CWAI */
m68_state->extra_cycles += 7; /* subtract +7 cycles */
}
else
{
CC &= ~CC_E; /* save 'short' state */
PUSHWORD(pPC);
PUSHBYTE(CC);
m68_state->extra_cycles += 10; /* subtract +10 cycles */
}
CC |= CC_IF | CC_II; /* inhibit FIRQ and IRQ */
PCD=RM16(0xfff6);
CHANGE_PC;
(void)(*m68_state->irq_callback)(m68_state->device, M6809_FIRQ_LINE);
}
else
if( m68_state->irq_state[M6809_IRQ_LINE]!=CLEAR_LINE && !(CC & CC_II) )
{
/* standard IRQ */
/* HJB 990225: state already saved by CWAI? */
if( m68_state->int_state & M6809_CWAI )
{
m68_state->int_state &= ~M6809_CWAI; /* clear CWAI flag */
m68_state->extra_cycles += 7; /* subtract +7 cycles */
}
else
{
CC |= CC_E; /* save entire state */
PUSHWORD(pPC);
PUSHWORD(pU);
PUSHWORD(pY);
PUSHWORD(pX);
PUSHBYTE(DP);
PUSHBYTE(B);
PUSHBYTE(A);
PUSHBYTE(CC);
m68_state->extra_cycles += 19; /* subtract +19 cycles */
}
CC |= CC_II; /* inhibit IRQ */
PCD=RM16(0xfff8);
CHANGE_PC;
(void)(*m68_state->irq_callback)(m68_state->device, M6809_IRQ_LINE);
}
}
@ -362,8 +363,16 @@ static CPU_SET_CONTEXT( m6809 )
/****************************************************************************/
static CPU_INIT( m6809 )
{
/* default configuration */
static const m6809_config default_config =
{
0
};
const m6809_config *configdata = device->static_config ? device->static_config : &default_config;
m68_state_t *m68_state = device->token;
m68_state->config = configdata;
m68_state->irq_callback = irqcallback;
m68_state->device = device;
@ -388,7 +397,7 @@ static CPU_INIT( m6809 )
static CPU_RESET( m6809 )
{
m68_state_t *m68_state = device->token;
m68_state->int_state = 0;
m68_state->nmi_state = CLEAR_LINE;
m68_state->irq_state[0] = CLEAR_LINE;
@ -467,7 +476,7 @@ static void set_irq_line(m68_state_t *m68_state, int irqline, int state)
static CPU_EXECUTE( m6809 ) /* NS 970908 */
{
m68_state_t *m68_state = device->token;
m68_icount = cycles - m68_state->extra_cycles;
m68_state->extra_cycles = 0;
@ -1050,7 +1059,7 @@ INLINE void fetch_effective_address( m68_state_t *m68_state )
static CPU_SET_INFO( m6809 )
{
m68_state_t *m68_state = device->token;
switch (state)
{
/* --- the following bits of info are set as 64-bit signed integers --- */
@ -1081,7 +1090,7 @@ static CPU_SET_INFO( m6809 )
CPU_GET_INFO( m6809 )
{
m68_state_t *m68_state = (device != NULL) ? device->token : NULL;
switch (state)
{
/* --- the following bits of info are returned as 64-bit signed integers --- */

7
src/emu/cpu/m6809/m6809.h
View File

@ -53,4 +53,11 @@ CPU_GET_INFO( m6809e );
CPU_DISASSEMBLE( m6809 );
typedef struct _m6809_config m6809_config;
struct _m6809_config
{
UINT8 encrypt_only_first_byte; /* encrypt only the first byte in 10 xx and 11 xx opcodes */
};
#endif /* __M6809_H__ */