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Fix previous opcode detection for LB and LBL. Fix disassembler for LBL (nw)

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This commit is contained in:
jbu 2014-12-07 06:09:18 +01:00
parent 9297276bf9
commit 015c4485ae
2 changed files with 8 additions and 7 deletions
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12
src/emu/cpu/pps4/pps4.c
View File

@ -115,7 +115,7 @@ offs_t pps4_device::disasm_disassemble(char *buffer, offs_t pc, const UINT8 *opr
*/ */
inline UINT8 pps4_device::ROP() inline UINT8 pps4_device::ROP()
{ {
m_Ip = m_I & 0xf0; // set previous opcode mask m_Ip = m_I; // set previous opcode
m_I = m_direct->read_decrypted_byte(m_P & 0xFFF); m_I = m_direct->read_decrypted_byte(m_P & 0xFFF);
m_P = (m_P + 1) & 0xFFF; m_P = (m_P + 1) & 0xFFF;
m_icount -= 1; m_icount -= 1;
@ -580,7 +580,7 @@ void pps4_device::iEXD()
void pps4_device::iLDI() void pps4_device::iLDI()
{ {
// previous LDI instruction? // previous LDI instruction?
if (0x70 == m_Ip) { if (0x70 == (m_Ip & 0xf0)) {
LOG(("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I)); LOG(("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I));
return; return;
} }
@ -792,7 +792,7 @@ void pps4_device::iCYS()
} }
/** /**
* @brief pps4_device::iLB * @brief pps4_device::iLB Load B indirect
* OPCODE cycles mnemonic * OPCODE cycles mnemonic
* ----------------------------- * -----------------------------
* 1100 xxxx 2 cyc LB x * 1100 xxxx 2 cyc LB x
@ -827,7 +827,7 @@ void pps4_device::iCYS()
void pps4_device::iLB() void pps4_device::iLB()
{ {
// previous LB or LBL instruction? // previous LB or LBL instruction?
if (0xc0 == m_Ip|| 0x00 == m_Ip) { if (0xc0 == (m_Ip & 0xf0) || 0x00 == m_Ip) {
LOG(("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I)); LOG(("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I));
return; return;
} }
@ -843,7 +843,7 @@ void pps4_device::iLB()
} }
/** /**
* @brief pps4_device::iLBL * @brief pps4_device::iLBL Load B long
* OPCODE cycles mnemonic * OPCODE cycles mnemonic
* ----------------------------- * -----------------------------
* 0000 0000 2 cyc LBL * 0000 0000 2 cyc LBL
@ -869,7 +869,7 @@ void pps4_device::iLBL()
{ {
const UINT8 i8 = ~ARG() & 255; const UINT8 i8 = ~ARG() & 255;
// previous LB or LBL instruction? // previous LB or LBL instruction?
if (0xc0 == m_Ip || 0x00 == m_Ip) { if (0xc0 == (m_Ip & 0xf0) || 0x00 == m_Ip) {
LOG(("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I)); LOG(("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I));
return; return;
} }

3
src/emu/cpu/pps4/pps4dasm.c
View File

@ -418,7 +418,8 @@ CPU_DISASSEMBLE( pps4 )
if (tok & t_I8c) { if (tok & t_I8c) {
// 8 bit immediate offset into page // 8 bit immediate offset into page
UINT16 arg = ~ARG(pc++) & 255; UINT16 arg = pc & ~0xff;
arg |= ~ARG(pc++) & 255;
dst += sprintf(dst, "%03x", arg); dst += sprintf(dst, "%03x", arg);
} }