-/* cpu8051.c */
-
+/*
+ * cpu8051.c
+ *
+ * Copyright (C) 1999 Jonathan St-André
+ * Copyright (C) 1999 Hugo Villeneuve <hugo@hugovil.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
/* Define only here, for not having extern scope on local variables. */
#define CPU8051_M 1
-
#include <stdio.h>
+#include <stdint.h>
#include "reg8051.h"
#include "cpu8051.h"
#include "disasm.h"
#include "instructions_8051.h"
+/* Check if the address is a breakpoint */
+int
+IsBreakpoint(unsigned int address)
+{
+ int k;
+
+ for (k = 0; k < cpu8051.bp_count; k++) {
+ if (cpu8051.bp[k] == address)
+ return 1;
+ }
+
+ /* The address was not found in the list of breakpoints */
+ return 0;
+}
+/* Show Breakpoints list */
void
-cpu8051_init( void )
+ShowBreakpoints(void)
{
- cpu8051.pc = 0;
- cpu8051.clock = 0;
- cpu8051.active_priority = -1;
-}
+ int k;
+ for (k = 0; k < cpu8051.bp_count; k++)
+ printf("Breakpoint at address = %.4X\n", cpu8051.bp[k]);
+}
-//////////////////////////////////////////////////////////////////////////////
-// Execute at address cpu8051.pc from PGMMem
-//////////////////////////////////////////////////////////////////////////////
+/* Set Breakpoint at address at the end of the breakpoint list */
void
-cpu8051_Exec( void )
+SetBreakpoint(unsigned int address)
{
- int i;
- unsigned char opcode;
- int insttiming;
-
- opcode = memory_read8( PGM_MEM_ID, cpu8051.pc );
- cpu8051.pc++;
- insttiming = (*opcode_table[opcode])(); /* Function callback. */
-
- for( i = 0; i < insttiming; i++ ) {
- cpu8051_CheckInterrupts();
- cpu8051_DoTimers();
- cpu8051.clock++;
- }
+ if (IsBreakpoint(address))
+ return; /* Already a breakpoint */
+
+ if (cpu8051.bp_count < MAXBP)
+ cpu8051.bp[cpu8051.bp_count++] = address;
}
+/* Clear Breakpoint at Address from list */
+void
+ClearBreakpoint(unsigned int address)
+{
+ int k;
+
+ for (k = 0; k < cpu8051.bp_count; k++) {
+ if (cpu8051.bp[k] == address) {
+ /* Fill removed breakpoint slot with last entry */
+ cpu8051.bp[k] = cpu8051.bp[cpu8051.bp_count - 1];
+ cpu8051.bp_count--;
+ }
+ }
+}
-//////////////////////////////////////////////////////////////////////////////
-// Return cpu8051.pc + size in bytes of current instruction
-//////////////////////////////////////////////////////////////////////////////
-unsigned int
-cpu8051_GetNextAddress( void )
+/* Toggle the breakpoint at Address. */
+void
+ToggleBreakpoint(unsigned int address)
{
-#ifdef DECPP
- return ( cpu8051.pc + InstSizesTbl[ memory_read8( PGM_MEM_ID, cpu8051.pc ) ] );
-#endif
- return 0; /* temp */
+ if (IsBreakpoint(address))
+ ClearBreakpoint(address);
+ else
+ SetBreakpoint(address);
}
+void
+cpu8051_init(void)
+{
+ cpu8051.pc = 0;
+ cpu8051.clock = 0;
+ cpu8051.active_priority = -1;
+ cpu8051.bp_count = 0;
+}
-//////////////////////////////////////////////////////////////////////////////
-// Reset the registers and CPU state
-//////////////////////////////////////////////////////////////////////////////
+/* Reset the registers and CPU state */
void
-cpu8051_Reset( void )
+cpu8051_Reset(void)
{
- cpu8051.pc = 0;
- cpu8051.clock= 0;
- cpu8051.active_priority = -1;
+ int i;
- // Reinitialisation des registres
- int i;
- for ( i = 0; i < 128; i++ ) {
+ cpu8051.pc = 0;
+ cpu8051.clock = 0;
+ cpu8051.active_priority = -1;
- memory_write8( SFR_MEM_ID, i, 0 );
+ /* Reset registers */
- memory_write8( INT_MEM_ID, i, 0 );
- }
+ for (i = 0; i < 256; i++) {
+ /* Clear IRAM nad SFR */
+ memory_write8(INT_MEM_ID, i, 0);
+ }
- memory_write8( SFR_MEM_ID, _P0_ - 0x80, 0xFF );
- memory_write8( SFR_MEM_ID, _P1_ - 0x80, 0xFF );
- memory_write8( SFR_MEM_ID, _P2_ - 0x80, 0xFF );
- memory_write8( SFR_MEM_ID, _P3_ - 0x80, 0xFF );
- memory_write8( SFR_MEM_ID, _SP_ - 0x80, 0x07 );
+ memory_write8(INT_MEM_ID, _P0_, 0xFF);
+ memory_write8(INT_MEM_ID, _P1_, 0xFF);
+ memory_write8(INT_MEM_ID, _P2_, 0xFF);
+ memory_write8(INT_MEM_ID, _P3_, 0xFF);
+ memory_write8(INT_MEM_ID, _SP_, 0x07);
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Write with a direct addressing mode at Address the new Value
-//////////////////////////////////////////////////////////////////////////////
-void
-cpu8051_WriteD( unsigned int Address, unsigned char Value )
+static void
+cpu8051_convert_bit_address(uint8_t bit_address, uint8_t *byte_address,
+ uint8_t *bit_number)
{
- if ( Address > 0x7F ) {
- memory_write8( SFR_MEM_ID, Address - 0x80, Value );
- return;
- }
-
- memory_write8( INT_MEM_ID, Address, Value );
+ if (bit_address > 0x7F) {
+ /* SFR 80-FF */
+ *byte_address = bit_address & 0xF8;
+ *bit_number = bit_address & 0x07;
+ } else {
+ /* 20-2F */
+ *byte_address = (bit_address >> 3) + 0x20;
+ *bit_number = bit_address & 0x07;
+ }
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Ecriture d'une valeur dans la memoire interne ( Address = $00 a $FF )
-//////////////////////////////////////////////////////////////////////////////
+/* Write with a direct addressing mode at Address the new Value */
void
-cpu8051_WriteInt( unsigned int Address, unsigned char Value )
+cpu8051_WriteD(unsigned int Address, unsigned char Value)
{
- if ( Address > 0x7F ) {
- memory_write8( SFR_MEM_ID, Address - 0x80, Value );
- }
- else {
- memory_write8( INT_MEM_ID, Address, Value );
- }
-
- return;
+ memory_write8(INT_MEM_ID, Address, Value);
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Write with an indirect addressing mode at Address the new Value
-//////////////////////////////////////////////////////////////////////////////
+/* Write with an indirect addressing mode at Address the new Value */
void
-cpu8051_WriteI( unsigned int Address, unsigned char Value )
+cpu8051_WriteI(unsigned int Address, unsigned char Value)
{
- if ( Address > 0x7F ) {
- memory_write8( EXT_MEM_ID, Address, Value );
- return;
- }
+ if (Address > 0x7F) {
+ memory_write8(EXT_MEM_ID, Address, Value);
+ return;
+ }
- memory_write8( INT_MEM_ID, Address, Value );
+ memory_write8(INT_MEM_ID, Address, Value);
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Read with a direct addressing mode at Address
-//////////////////////////////////////////////////////////////////////////////
-unsigned char
-cpu8051_ReadD( unsigned int Address )
+/* Write with a bit addressing mode at BitAddress the new Value */
+void
+cpu8051_WriteB(uint8_t bit_address, uint8_t value)
{
- if ( Address > 0xFF ) {
- return memory_read8( EXT_MEM_ID, Address );
- }
+ uint8_t byte_address;
+ uint8_t bit_number;
+ unsigned char ByteValue, ByteMask;
- if ( Address > 0x7F ) {
- return memory_read8( SFR_MEM_ID, Address - 0x80 );
- }
+ cpu8051_convert_bit_address(bit_address, &byte_address, &bit_number);
- return memory_read8( INT_MEM_ID, Address );
+ ByteMask = ((1 << bit_number) ^ 0xFF);
+ ByteValue = cpu8051_ReadD(byte_address) & ByteMask;
+ ByteValue += value << bit_number;
+ cpu8051_WriteD(byte_address, ByteValue);
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Read Internal data memory at Address
-//////////////////////////////////////////////////////////////////////////////
+/* Read with a direct addressing mode at Address */
unsigned char
-cpu8051_ReadInt( unsigned int Address )
+cpu8051_ReadD(unsigned int Address)
{
- if ( Address > 0x7F ) {
- return memory_read8( SFR_MEM_ID, Address - 0x80 );
- }
- else {
- return memory_read8( INT_MEM_ID, Address );
- }
+ if (Address > 0xFF)
+ return memory_read8(EXT_MEM_ID, Address);
+ else
+ return memory_read8(INT_MEM_ID, Address);
}
-
-//////////////////////////////////////////////////////////////////////////////
-// unsigned char cpu8051_ReadI( unsigned int Address )
-// Read with a indirect addressing mode at Address
-//////////////////////////////////////////////////////////////////////////////
+/* Read with a indirect addressing mode at Address */
unsigned char
-cpu8051_ReadI( unsigned int Address )
+cpu8051_ReadI(unsigned int Address)
{
- if ( Address > 0x7F ) {
- return memory_read8( EXT_MEM_ID, Address );
- }
- else {
- return memory_read8( INT_MEM_ID, Address );
- }
+ if (Address > 0x7F)
+ return memory_read8(EXT_MEM_ID, Address);
+ else
+ return memory_read8(INT_MEM_ID, Address);
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Write with a bit addressing mode at BitAddress the new Value
-//////////////////////////////////////////////////////////////////////////////
-void
-cpu8051_WriteB( unsigned int BitAddress, unsigned char Value )
+/* Read with a bit addressing mode at BitAddress */
+unsigned char
+cpu8051_ReadB(uint8_t bit_address)
{
- unsigned int ByteAddress, BitNumber;
- unsigned char ByteValue, ByteMask;
-
- if ( BitAddress > 0x7F ) {
- // SFR 80-FF
- ByteAddress = BitAddress & 0xF8;
- BitNumber = BitAddress & 0x07;
- }
- else {
- // 20-2F
- ByteAddress = ( BitAddress >> 3 ) + 0x20;
- BitNumber = BitAddress & 0x07;
- }
- ByteMask = ( ( 1 << BitNumber ) ^ 0xFF );
- ByteValue = cpu8051_ReadD( ByteAddress ) & ByteMask;
- ByteValue += Value << BitNumber;
- cpu8051_WriteD( ByteAddress, ByteValue );
-}
+ uint8_t byte_address;
+ uint8_t bit_number;
+ unsigned char BitValue;
+ cpu8051_convert_bit_address(bit_address, &byte_address, &bit_number);
-//////////////////////////////////////////////////////////////////////////////
-// Read with a bit addressing mode at BitAddress
-//////////////////////////////////////////////////////////////////////////////
-unsigned char
-cpu8051_ReadB( unsigned int BitAddress )
+ BitValue = (cpu8051_ReadD(byte_address) >> bit_number);
+ BitValue &= 1;
+ return BitValue;
+}
+
+static void
+cpu8051_process_interrupt(int pc, int pri)
{
- unsigned int ByteAddress, BitNumber;
- unsigned char BitValue;
-
- if ( BitAddress > 0x7F ) {
- // SFR 80-FF
- ByteAddress = BitAddress & 0xF8;
- BitNumber = BitAddress & 0x07;
- }
- else {
- // 20-2F
- ByteAddress = ( BitAddress >> 3 ) + 0x20;
- BitNumber = BitAddress & 0x07;
- }
- BitValue = ( cpu8051_ReadD( ByteAddress ) >> BitNumber );
- BitValue &= 1;
- return BitValue;
+ unsigned char SP;
+
+ SP = cpu8051_ReadD(_SP_);
+ cpu8051_WriteI(++SP, (cpu8051.pc & 0xFF));
+ cpu8051_WriteI(++SP, (cpu8051.pc >> 8));
+ cpu8051_WriteD(_SP_, SP);
+ cpu8051.pc = 0x0B;
+ cpu8051.active_priority = pri;
}
-//////////////////////////////////////////////////////////////////////////////
-// Check interrupts state and process them as needed
-//////////////////////////////////////////////////////////////////////////////
-void
-cpu8051_CheckInterrupts()
+/* Check interrupts state and process them as needed */
+static void
+cpu8051_CheckInterrupts(void)
{
- unsigned char SP;
- int i;
-
- if ( cpu8051_ReadD( _IE_ ) & 0x80 ) {
- for ( i = 1; i >= 0; i-- )
- if ( cpu8051.active_priority < i ) {
- //------------------------- External interrupt 0 ----------------------------
- // if ( ( cpu8051_ReadD( _IE_ ) & 0x01 ) && ( ( cpu8051_ReadD( _IP_ ) & 0x01 ) ? i : !i ) && pin0 )
- //-------------------------- Interrupt timer 0 -------------------------------
- if ( ( cpu8051_ReadD( _IE_ ) & 0x02 ) && ( ( cpu8051_ReadD( _IP_ & 0x02 ) ? i : !i ) && ( cpu8051_ReadD( _TCON_ ) & 0x20 ) ) ){
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) & 0xDF );
- SP = cpu8051_ReadD( _SP_ );
- cpu8051_WriteI( ++SP, ( cpu8051.pc & 0xFF ) );
- cpu8051_WriteI( ++SP, ( cpu8051.pc >> 8 ) );
- cpu8051_WriteD( _SP_, SP );
- cpu8051.pc = 0x0B;
- cpu8051.active_priority = i;
- return;
- }
- //-------------------------- External interrupt 1 ----------------------------
- // if ( ( cpu8051_ReadD( _IE_ ) & 0x04 ) && ( ( cpu8051_ReadD( _IP_ ) & 0x04 ) ? i : !i ) && pin1 )
- //-------------------------- Interrupt timer 1 -------------------------------
- if ( ( cpu8051_ReadD( _IE_ ) & 0x08 ) && ( ( cpu8051_ReadD( _IP_ ) & 0x08 ) ? i : !i ) && ( cpu8051_ReadD( _TCON_ ) & 0x80 ) ) {
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) & 0x7F );
- SP = cpu8051_ReadD( _SP_ );
- cpu8051_WriteI( ++SP, ( cpu8051.pc & 0xFF ) );
- cpu8051_WriteI( ++SP, ( cpu8051.pc >> 8 ) );
- cpu8051_WriteD( _SP_, SP );
- cpu8051.pc = 0x1B;
- cpu8051.active_priority = i;
- return;
+ int i;
+
+ if ((cpu8051_ReadD(_IE_) & 0x80) == 0)
+ return;
+
+ for (i = 1; i >= 0; i--) {
+ if (cpu8051.active_priority < i) {
+ /* Interrupt timer 0 */
+ if ((cpu8051_ReadD(_IE_) & 0x02) &&
+ ((cpu8051_ReadD(_IP_ & 0x02) ? i : !i) &&
+ (cpu8051_ReadD(_TCON_) & 0x20))) {
+ cpu8051_WriteD(_TCON_,
+ cpu8051_ReadD(_TCON_) & 0xDF);
+ cpu8051_process_interrupt(0x0B, i);
+ return;
+ }
+ /* Interrupt timer 1 */
+ if ((cpu8051_ReadD(_IE_) & 0x08) &&
+ ((cpu8051_ReadD(_IP_) & 0x08) ? i : !i) &&
+ (cpu8051_ReadD(_TCON_) & 0x80)) {
+ cpu8051_WriteD(_TCON_,
+ cpu8051_ReadD(_TCON_) & 0x7F);
+ cpu8051_process_interrupt(0x1B, i);
+ return;
+ }
+ /* Serial Interrupts */
+ if ((cpu8051_ReadD(_IE_) & 0x10) &&
+ ((cpu8051_ReadD(_IP_) & 0x10) ? i : !i) &&
+ (cpu8051_ReadD(_SCON_) & 0x03)) {
+ cpu8051_process_interrupt(0x23, i);
+ return;
+ }
+ /* Interrupt timer 2 */
+ if ((cpu8051_ReadD(_IE_) & 0x20) &&
+ ((cpu8051_ReadD(_IP_) & 0x20) ? i : !i) &&
+ (cpu8051_ReadD(_T2CON_) & 0x80)) {
+ cpu8051_process_interrupt(0x2B, i);
+ return;
+ }
+ }
}
- //-------------------------- Serial Interrupts -------------------------------
- if ( ( cpu8051_ReadD( _IE_ ) & 0x10 ) && ( ( cpu8051_ReadD( _IP_ ) & 0x10 ) ? i : !i ) && ( cpu8051_ReadD( _SCON_ ) & 0x03 ) ) {
- SP = cpu8051_ReadD( _SP_ );
- cpu8051_WriteI( ++SP, ( cpu8051.pc & 0xFF ) );
- cpu8051_WriteI( ++SP, ( cpu8051.pc >> 8 ) );
- cpu8051_WriteD( _SP_, SP );
- cpu8051.pc = 0x23;
- cpu8051.active_priority = i;
- return;
- }
- //-------------------------- Interrupt timer 2 -------------------------------
- if ( ( cpu8051_ReadD( _IE_ ) & 0x20 ) && ( ( cpu8051_ReadD( _IP_ ) & 0x20 ) ? i : !i ) && ( cpu8051_ReadD( _T2CON_ ) & 0x80 ) ) {
- SP = cpu8051_ReadD( _SP_ );
- cpu8051_WriteI( ++SP, ( cpu8051.pc & 0xFF ) );
- cpu8051_WriteI( ++SP, ( cpu8051.pc >> 8 ) );
- cpu8051_WriteD( _SP_, SP );
- cpu8051.pc = 0x2B;
- cpu8051.active_priority = i;
- return;
+}
+
+static void
+process_timer(uint8_t tl, uint8_t th, uint8_t tf_mask, uint8_t TR, uint8_t mode,
+ uint8_t GATE, uint32_t TimerCounter)
+{
+ unsigned int tmp;
+
+ switch (mode) {
+ case 0:
+ /* Mode 0, 13-bits counter. */
+ tmp = cpu8051_ReadD(th) * 0x100 + cpu8051_ReadD(tl);
+ tmp++;
+ tmp &= 0x1FFF; /* We keep only 13 bits */
+
+ if (tmp == 0) /* If overflow set TF0 */
+ cpu8051_WriteD(_TCON_, cpu8051_ReadD(_TCON_) | tf_mask);
+ cpu8051_WriteD(_TH0_, tmp / 0x100);
+ cpu8051_WriteD(_TL0_, tmp & 0xFF);
+ break;
+ case 1:
+ /* Mode 1, 16-bits counter */
+ tmp = cpu8051_ReadD(th) * 0x100 + cpu8051_ReadD(tl);
+ tmp++;
+ tmp &= 0xFFFF; /* We keep only 16 bits */
+ if (tmp == 0) /* If overflow set TF0 */
+ cpu8051_WriteD(_TCON_, cpu8051_ReadD(_TCON_) | tf_mask);
+ cpu8051_WriteD(_TH0_, (tmp / 0x100));
+ cpu8051_WriteD(_TL0_, (tmp & 0xFF));
+ break;
+ case 2:
+ /* Mode 2, 8-bits counter with Auto-Reload */
+ tmp = cpu8051_ReadD(tl);
+ tmp++;
+ tmp &= 0xFF;
+ if (tmp == 0) {
+ /* If overflow -> reload and set TF0 */
+ cpu8051_WriteD(_TCON_, cpu8051_ReadD(_TCON_) | tf_mask);
+ cpu8051_WriteD(tl, cpu8051_ReadD(th));
+ } else
+ cpu8051_WriteD(tl, tmp);
+ break;
+ case 3:
+ /* Mode 3 : inactive mode for timer 1 */
+ if (tl == _TL0_) {
+ /* TL0 and TH0 are 2 independents 8-bits timers. */
+ if (TR && !GATE && !TimerCounter) {
+ tmp = cpu8051_ReadD(tl);
+ tmp++;
+ tmp &= 0xFF;
+ if (tmp == 0) /* If TL0 overflow set TF0 */
+ cpu8051_WriteD(_TCON_,
+ cpu8051_ReadD(_TCON_) |
+ tf_mask);
+ cpu8051_WriteD(tl, tmp);
+ } /* TH0 utilise TR1 et TF1. */
+ TR = cpu8051_ReadD(_TCON_) & 0x40;
+ if (TR) {
+ tmp = cpu8051_ReadD(th);
+ tmp++;
+ tmp &= 0xFF;
+ if (tmp == 0) /* If TH0 overflow set TF1 */
+ cpu8051_WriteD(_TCON_,
+ cpu8051_ReadD(_TCON_) |
+ 0x80);
+ cpu8051_WriteD(_TH0_, tmp);
+ }
+ }
+ break;
}
- }
- }
}
+/* Run timers */
+static void
+cpu8051_DoTimers(void)
+{
+ unsigned int TR;
+ unsigned int MODE;
+ unsigned int GATE;
+ unsigned int TimerCounter;
+
+ /* Timer 0 */
+ TR = cpu8051_ReadD(_TCON_) & 0x10;
+ MODE = cpu8051_ReadD(_TMOD_) & 0x03;
+ GATE = cpu8051_ReadD(_TMOD_) & 0x08;
+ TimerCounter = cpu8051_ReadD(_TMOD_) & 0x04;
+
+ if ((TR && !GATE && !TimerCounter) || (MODE == 3))
+ process_timer(_TL0_, _TH0_, 0x20, TR, MODE, GATE, TimerCounter);
+
+ /* Timer 1 */
+ TR = cpu8051_ReadD(_TCON_) & 0x40;
+ MODE = (cpu8051_ReadD(_TMOD_) & 0x30) >> 4 ;
+ GATE = cpu8051_ReadD(_TMOD_) & 0x80;
+ TimerCounter = cpu8051_ReadD(_TMOD_) & 0x40;
+
+ if (TR && !GATE && !TimerCounter)
+ process_timer(_TL1_, _TH1_, 0x80, TR, MODE, GATE, TimerCounter);
+}
-//////////////////////////////////////////////////////////////////////////////
-// Execute les timers
-//////////////////////////////////////////////////////////////////////////////
+/* Execute at address cpu8051.pc from PGMMem */
void
-cpu8051_DoTimers( )
+cpu8051_Exec(void)
{
- unsigned int tmp;
- unsigned int TR;
- unsigned int MODE;
- unsigned int GATE;
- unsigned int TimerCounter;
-
- // ----- Timer 0
- TR = cpu8051_ReadD( _TCON_ ) & 0x10;
- MODE = cpu8051_ReadD( _TMOD_ ) & 0x03;
- GATE = cpu8051_ReadD( _TMOD_ ) & 0x08;
- TimerCounter = cpu8051_ReadD( _TMOD_ ) & 0x04;
-
- if ( ( TR && !GATE && !TimerCounter ) || ( MODE == 3 ) )
- switch( MODE ) {
- // Mode 0, compteur de 13 bits.
- case 0 :
- tmp = cpu8051_ReadD( _TH0_ ) * 0x100 + cpu8051_ReadD( _TL0_ );
-
- tmp++;
- tmp &= 0x1FFF; // On ne garde que 13 bits.
-
- if ( tmp == 0 ) // If overflow set TF0
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x20 );
- cpu8051_WriteD( _TH0_, tmp / 0x100 );
- cpu8051_WriteD( _TL0_, tmp & 0xFF );
- break;
-
- // Mode 1, compteur de 16 bits.
- case 1 :
- tmp = cpu8051_ReadD( _TH0_ ) * 0x100 + cpu8051_ReadD( _TL0_ );
- tmp++;
- tmp &= 0xFFFF; // On ne garde que 16 bits.
- if ( tmp == 0 ) // If overflow set TF0
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x20 );
- cpu8051_WriteD( _TH0_, ( tmp / 0x100 ) );
- cpu8051_WriteD( _TL0_, ( tmp & 0xFF ) );
- break;
-
- // Mode 2, Compteur de 8 bits avec Auto-Reload
- case 2 :
- tmp = cpu8051_ReadD( _TL0_ );
- tmp++;
- tmp &= 0xFF;
- if ( tmp == 0 ) { // If overflow -> reload et set TF0
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x20 );
- cpu8051_WriteD( _TL0_, cpu8051_ReadD( _TH0_ ) );
- }
- else
- cpu8051_WriteD( _TL0_, tmp );
- break;
-
- // Mode 3 : TL0 et TH0 sont 2 Timers independants de 8 bits chacuns.
- case 3 :
- if ( TR && !GATE && !TimerCounter ) {
- tmp = cpu8051_ReadD( _TL0_ );
- tmp++;
- tmp &= 0xFF;
- if ( tmp == 0 ) // If TL0 overflow set TF0
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x20 );
- cpu8051_WriteD( _TL0_, tmp );
- } // TH0 utilise TR1 et TF1.
- TR = cpu8051_ReadD( _TCON_ ) & 0x40;
- if ( TR ) {
- tmp = cpu8051_ReadD( _TH0_ );
- tmp++;
- tmp &= 0xFF;
- if ( tmp == 0 ) // If TH0 overflow set TF1
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x80 ); // TF1 = 1.
- cpu8051_WriteD( _TH0_, tmp );
- }
- break;
- };
-
-
- // ----- Timer 1
- TR = cpu8051_ReadD( _TCON_ ) & 0x40;
- MODE = ( cpu8051_ReadD( _TMOD_ ) & 0x30 ) >> 4 ;
- GATE = cpu8051_ReadD( _TMOD_ ) & 0x80;
- TimerCounter = cpu8051_ReadD( _TMOD_ ) & 0x40;
-
- if ( TR && !GATE && !TimerCounter )
- switch( MODE ) {
- // Mode 0, compteur de 13 bits.
- case 0 :
- tmp = cpu8051_ReadD( _TH1_ ) * 0x100 + cpu8051_ReadD( _TL1_ );
- tmp++;
- tmp &= 0x1FFF; // On ne garde que 13 bits.
- if ( tmp == 0 ) // If overflow set TF1
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x80 );
- cpu8051_WriteD( _TH1_, tmp / 0x100 );
- cpu8051_WriteD( _TL1_, tmp & 0xFF );
- break;
-
- // Mode 1, compteur de 16 bits.
- case 1 :
- tmp = cpu8051_ReadD( _TH1_ ) * 0x100 + cpu8051_ReadD( _TL1_ );
- tmp++;
- tmp &= 0xFFFF; // On ne garde que 16 bits.
- if ( tmp == 0 ) // If overflow set TF1
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x80 );
- cpu8051_WriteD( _TH1_, ( tmp / 0x100 ) );
- cpu8051_WriteD( _TL1_, ( tmp & 0xFF ) );
- break;
-
- // Mode 2, Compteur de 8 bits avec Auto-Reload
- case 2 :
- tmp = cpu8051_ReadD( _TL1_ );
- tmp++;
- tmp &= 0xFF;
- if ( tmp == 0 ) { // If overflow -> reload et set TF1
- cpu8051_WriteD( _TCON_, cpu8051_ReadD( _TCON_ ) | 0x80 );
- cpu8051_WriteD( _TL1_, cpu8051_ReadD( _TH1_ ) );
- }
- else
- cpu8051_WriteD( _TL1_, tmp );
- break;
-
- // Mode 3 : mode inactif: retient la valeur de TH1 et TL1.
- // Equivalent a TR1 = 0.
- case 3 :
- break;
-
- };
+ int i;
+ unsigned char opcode;
+ int insttiming;
+
+ opcode = memory_read8(PGM_MEM_ID, cpu8051.pc);
+ cpu8051.pc++;
+ insttiming = (*opcode_table[opcode])(); /* Function callback. */
+
+ for (i = 0; i < insttiming; i++) {
+ cpu8051_CheckInterrupts();
+ cpu8051_DoTimers();
+ cpu8051.clock++;
+ }
}
-
-// Addressing modes defined in the order as they appear in disasm.hpp
-// from table argstext[]
+/*
+ * Addressing modes defined in the order as they appear in disasm.h
+ * from table argstext[]
+ */
#define ADDR11 0
#define ADDR16 1
#define DIRECT 3
#define DATA16 22
#define CBITADDR 23
-// SFR Memory map [80h - FFh]
-// ---------------------------------------------------------------
-// F8 | | | | | | | | | FF
-// F0 | B | | | | | | | | F7
-// E8 | | | | | | | | | EF
-// E0 | ACC | | | | | | | | E7
-// D8 | | | | | | | | | DF
-// D0 | PSW | | | | | | | | D7
-// C8 | T2CON| |RCAP2L|RCAP2H| TL2 | TH2 | | | CF
-// C0 | | | | | | | | | C7
-// B8 | IP | | | | | | | | BF
-// B0 | P3 | | | | | | | | B7
-// A8 | IE | | | | | | | | AF
-// A0 | P2 | | | | | | | | A7
-// 98 | SCON | SBUF | | | | | | | 9F
-// 90 | P1 | | | | | | | | 97
-// 88 | TCON | TMOD | TL0 | TL1 | TH0 | TH1 | | | 8F
-// 80 | P0 | SP | DPL | DPH | | | | PCON | 87
-// ---------------------------------------------------------------
-
-
-//////////////////////////////////////////////////////////////////////////////
-// Return as Text the name of the SFR register at Address if any
-//////////////////////////////////////////////////////////////////////////////
-int
-cpu8051_SFRMemInfo( unsigned int Address, char *Text )
+/*
+ * SFR Memory map [80h - FFh]
+ * ---------------------------------------------------------------
+ * F8 | | | | | | | | | FF
+ * F0 | B | | | | | | | | F7
+ * E8 | | | | | | | | | EF
+ * E0 | ACC | | | | | | | | E7
+ * D8 | | | | | | | | | DF
+ * D0 | PSW | | | | | | | | D7
+ * C8 | T2CON| |RCAP2L|RCAP2H| TL2 | TH2 | | | CF
+ * C0 | | | | | | | | | C7
+ * B8 | IP | | | | | | | | BF
+ * B0 | P3 | | | | | | | | B7
+ * A8 | IE | | | | | | | | AF
+ * A0 | P2 | | | | | | | | A7
+ * 98 | SCON | SBUF | | | | | | | 9F
+ * 90 | P1 | | | | | | | | 97
+ * 88 | TCON | TMOD | TL0 | TL1 | TH0 | TH1 | | | 8F
+ * 80 | P0 | SP | DPL | DPH | | | | PCON | 87
+ * ---------------------------------------------------------------
+ */
+
+/* Return as Text the name of the SFR register at Address if any */
+static int
+cpu8051_SFRMemInfo(unsigned int Address, char *Text)
{
- switch( Address ) {
- case 0x80 : return sprintf( Text, "P0" );
- case 0x81 : return sprintf( Text, "SP" );
- case 0x82 : return sprintf( Text, "DPL" );
- case 0x83 : return sprintf( Text, "DPH" );
- case 0x87 : return sprintf( Text, "PCON" );
- case 0x88 : return sprintf( Text, "TCON" );
- case 0x89 : return sprintf( Text, "TMOD" );
- case 0x8A : return sprintf( Text, "TL0" );
- case 0x8B : return sprintf( Text, "TL1" );
- case 0x8C : return sprintf( Text, "TH0" );
- case 0x8D : return sprintf( Text, "TH1" );
- case 0x90 : return sprintf( Text, "P1" );
- case 0x98 : return sprintf( Text, "SCON" );
- case 0x99 : return sprintf( Text, "SBUF" );
- case 0xA0 : return sprintf( Text, "P2" );
- case 0xA8 : return sprintf( Text, "IE" );
- case 0xB0 : return sprintf( Text, "P3" );
- case 0xB8 : return sprintf( Text, "IP" );
- case 0xC8 : return sprintf( Text, "T2CON" );
- case 0xCA : return sprintf( Text, "RCAP2L" );
- case 0xCB : return sprintf( Text, "RCAP2H" );
- case 0xCC : return sprintf( Text, "TL2" );
- case 0xCD : return sprintf( Text, "TH2" );
- case 0xD0 : return sprintf( Text, "PSW" );
- case 0xE0 : return sprintf( Text, "ACC" );
- case 0xF0 : return sprintf( Text, "B" );
- default : return sprintf( Text, "%.2XH", Address );
- }
+ switch (Address) {
+ case 0x80: return sprintf(Text, "P0");
+ case 0x81: return sprintf(Text, "SP");
+ case 0x82: return sprintf(Text, "DPL");
+ case 0x83: return sprintf(Text, "DPH");
+ case 0x87: return sprintf(Text, "PCON");
+ case 0x88: return sprintf(Text, "TCON");
+ case 0x89: return sprintf(Text, "TMOD");
+ case 0x8A: return sprintf(Text, "TL0");
+ case 0x8B: return sprintf(Text, "TL1");
+ case 0x8C: return sprintf(Text, "TH0");
+ case 0x8D: return sprintf(Text, "TH1");
+ case 0x90: return sprintf(Text, "P1");
+ case 0x98: return sprintf(Text, "SCON");
+ case 0x99: return sprintf(Text, "SBUF");
+ case 0xA0: return sprintf(Text, "P2");
+ case 0xA8: return sprintf(Text, "IE");
+ case 0xB0: return sprintf(Text, "P3");
+ case 0xB8: return sprintf(Text, "IP");
+ case 0xC8: return sprintf(Text, "T2CON");
+ case 0xCA: return sprintf(Text, "RCAP2L");
+ case 0xCB: return sprintf(Text, "RCAP2H");
+ case 0xCC: return sprintf(Text, "TL2");
+ case 0xCD: return sprintf(Text, "TH2");
+ case 0xD0: return sprintf(Text, "PSW");
+ case 0xE0: return sprintf(Text, "ACC");
+ case 0xF0: return sprintf(Text, "B");
+ default: return sprintf(Text, "%.2XH", Address);
+ }
}
-
-//////////////////////////////////////////////////////////////////////////////
-// Return as Text the decoded BitAddress
-//////////////////////////////////////////////////////////////////////////////
-void
-cpu8051_IntMemBitInfo( unsigned int BitAddress, char *Text )
+/* Return as Text the decoded BitAddress */
+static void
+cpu8051_IntMemBitInfo(uint8_t bit_address, char *text)
{
- unsigned int ByteAddress, BitNumber;
- int TextLength;
-
- if ( BitAddress > 0x7F ) {
- // SFR 80-FF
- ByteAddress = BitAddress & 0xF8;
- BitNumber = BitAddress & 0x07;
- }
- else {
- // 20-2F
- ByteAddress = ( BitAddress >> 3 ) + 0x20;
- BitNumber = BitAddress & 0x07;
- }
-
- TextLength = cpu8051_SFRMemInfo( ByteAddress, Text );
- // sprintf( &Text[ TextLength ], ".%X" );
- // Modified by Hugo Villeneuve to remove compilation warning
- sprintf( &Text[ TextLength ], ".%X", BitAddress );
-}
+ uint8_t byte_address;
+ uint8_t bit_number;
+ int len;
+
+ cpu8051_convert_bit_address(bit_address, &byte_address, &bit_number);
+ len = cpu8051_SFRMemInfo(byte_address, text);
+ sprintf(&text[len], ".%X", bit_address);
+}
-//////////////////////////////////////////////////////////////////////////////
-// Disasm one instruction at Address into a Text string
-//////////////////////////////////////////////////////////////////////////////
+/* Disasm one instruction at Address into a Text string */
int
-cpu8051_Disasm( unsigned int Address, char *Text )
+cpu8051_Disasm(unsigned int Address, char *Text)
{
- int TextLength=0;
- char TextTmp[20];
- unsigned char OpCode;
- int ArgTblOfs;
- int InstSize;
- int i;
-
- OpCode = memory_read8( PGM_MEM_ID, Address );
- InstSize = InstSizesTbl[ OpCode ];
- //printf("%.4X\n", Address);
-
- TextLength += sprintf( Text, " %.4X ", Address );
-
- for (i = 0; i < InstSize; i++ )
- TextLength += sprintf( &Text[TextLength], " %.2X", memory_read8( PGM_MEM_ID, Address + i ) );
-
- Address++;
-
- for (; TextLength < 17; ) TextLength += sprintf( &Text[ TextLength ], " " );
-
- TextLength += sprintf( &Text[ TextLength ], "%s ", InstTextTbl[ InstTypesTbl[ OpCode ] ] );
- ArgTblOfs = OpCode << 2;
-
- for (; TextLength < 25; ) TextLength += sprintf( &Text[ TextLength ], " " );
-
- // MOV direct, direct (OpCode 85h) is peculiar, the operands are inverted
- if ( OpCode == 0x85 ) {
- cpu8051_SFRMemInfo( memory_read8( PGM_MEM_ID, Address + 1 ), TextTmp );
- TextLength += sprintf( &Text[ TextLength ], "%s,", TextTmp );
- cpu8051_SFRMemInfo( memory_read8( PGM_MEM_ID, Address ), TextTmp );
- TextLength += sprintf( &Text[ TextLength ], "%s", TextTmp );
- Address += 2;
- return InstSize;
- }
-
- for ( i = 1; i <= InstArgTbl[ ArgTblOfs ]; i++ ) {
- switch( InstArgTbl[ ArgTblOfs + i ] ) {
- case ADDR11 : {
- TextLength += sprintf( &Text[ TextLength ], "%.4XH", ( ( OpCode << 3) & 0xF00 ) + ( memory_read8( PGM_MEM_ID, Address ) ) );
- Address++;
- break;
- }
- case ADDR16 : {
- TextLength += sprintf( &Text[ TextLength ], "%.4XH", ( ( memory_read8( PGM_MEM_ID, Address ) << 8 ) + memory_read8( PGM_MEM_ID, Address + 1 ) ) );
- Address += 2;
- break;
- }
- case DIRECT : {
- cpu8051_SFRMemInfo( memory_read8( PGM_MEM_ID, Address ), TextTmp );
- TextLength += sprintf( &Text[ TextLength ], "%s", TextTmp );
- Address++;
- break;
- }
- case BITADDR : {
- cpu8051_IntMemBitInfo( ( memory_read8( PGM_MEM_ID, Address ) & 0xF8 ), TextTmp );
- TextLength += sprintf( &Text[ TextLength ], "%s.%X" , TextTmp, ( memory_read8( PGM_MEM_ID, Address ) & 7 ) );
- Address++;
- break;
- }
- case RELADDR : {
- Address++;
- TextLength += sprintf( &Text[ TextLength ], "%.4XH", ( Address & 0xFF00 ) + ( ( ( Address & 0xFF ) + memory_read8( PGM_MEM_ID, Address - 1 ) ) & 0xFF ) );
- break;
- }
- case DATAIMM : {
- TextLength += sprintf( &Text[ TextLength ], "#%.2XH", memory_read8( PGM_MEM_ID, Address ) );
- Address++;
- break;
- }
- case DATA16 : {
- TextLength += sprintf( &Text[ TextLength ],"#%.4XH", ( ( memory_read8( PGM_MEM_ID, Address ) << 8 ) + memory_read8( PGM_MEM_ID, Address+1 ) ) );
- Address += 2;
- break;
- }
- case CBITADDR : {
- cpu8051_IntMemBitInfo( ( memory_read8( PGM_MEM_ID, Address ) & 0xF8 ), TextTmp );
- TextLength += sprintf( &Text[ TextLength ], "/%s.%X", TextTmp, ( memory_read8( PGM_MEM_ID, Address ) & 7 ) );
- Address++;
- break;
- }
- default : {
- TextLength += sprintf( &Text[ TextLength ],"%s", ArgsTextTbl[ InstArgTbl[ ArgTblOfs + i ] ] );
- }
- }
- if (i < InstArgTbl[ ArgTblOfs ]) { TextLength += sprintf( &Text[ TextLength ], "," ); }
- }
-
- return InstSize;
+ int len = 0;
+ char TextTmp[20];
+ unsigned char OpCode;
+ int ArgTblOfs;
+ int InstSize;
+ int i;
+
+ OpCode = memory_read8(PGM_MEM_ID, Address);
+ InstSize = InstSizesTbl[OpCode];
+
+ len += sprintf(Text, " %.4X ", Address);
+
+ for (i = 0; i < InstSize; i++)
+ len += sprintf(&Text[len], " %.2X",
+ memory_read8(PGM_MEM_ID, Address + i));
+
+ Address++;
+
+ for (; len < 17;)
+ len += sprintf(&Text[len], " ");
+
+ len += sprintf(&Text[len], "%s ",
+ InstTextTbl[InstTypesTbl[OpCode]]);
+ ArgTblOfs = OpCode << 2;
+
+ for (; len < 25;)
+ len += sprintf(&Text[len], " ");
+
+ /*
+ * MOV direct, direct (OpCode 85h) is peculiar, the operands
+ * are inverted
+ */
+ if (OpCode == 0x85) {
+ cpu8051_SFRMemInfo(memory_read8(PGM_MEM_ID, Address + 1),
+ TextTmp);
+ len += sprintf(&Text[len], "%s,", TextTmp);
+ cpu8051_SFRMemInfo(memory_read8(PGM_MEM_ID, Address),
+ TextTmp);
+ len += sprintf(&Text[len], "%s", TextTmp);
+ Address += 2;
+ return InstSize;
+ }
+
+ for (i = 1; i <= InstArgTbl[ArgTblOfs]; i++) {
+ switch (InstArgTbl[ArgTblOfs + i]) {
+ case ADDR11: {
+ len += sprintf(&Text[len],
+ "%.4XH", ((OpCode << 3) & 0xF00) +
+ (memory_read8(PGM_MEM_ID, Address)));
+ Address++;
+ break;
+ }
+ case ADDR16: {
+ len += sprintf(
+ &Text[len], "%.4XH",
+ ((memory_read8(PGM_MEM_ID, Address) << 8) +
+ memory_read8(PGM_MEM_ID, Address + 1)));
+ Address += 2;
+ break;
+ }
+ case DIRECT: {
+ cpu8051_SFRMemInfo(memory_read8(PGM_MEM_ID, Address),
+ TextTmp);
+ len += sprintf(&Text[len], "%s", TextTmp);
+ Address++;
+ break;
+ }
+ case BITADDR: {
+ cpu8051_IntMemBitInfo(
+ (memory_read8(PGM_MEM_ID, Address) & 0xF8),
+ TextTmp);
+ len += sprintf(&Text[len], "%s.%X" , TextTmp,
+ (memory_read8(PGM_MEM_ID, Address) & 7));
+ Address++;
+ break;
+ }
+ case RELADDR: {
+ Address++;
+ len += sprintf(&Text[len], "%.4XH", (Address & 0xFF00) +
+ (((Address & 0xFF) +
+ memory_read8(PGM_MEM_ID,
+ Address - 1)) & 0xFF));
+ break;
+ }
+ case DATAIMM: {
+ len += sprintf(&Text[len], "#%.2XH",
+ memory_read8(PGM_MEM_ID, Address));
+ Address++;
+ break;
+ }
+ case DATA16: {
+ len += sprintf(&Text[len], "#%.4XH",
+ ((memory_read8(PGM_MEM_ID,
+ Address) << 8) +
+ memory_read8(PGM_MEM_ID, Address+1)));
+ Address += 2;
+ break;
+ }
+ case CBITADDR: {
+ cpu8051_IntMemBitInfo((memory_read8(PGM_MEM_ID,
+ Address) & 0xF8),
+ TextTmp);
+ len += sprintf(&Text[len], "/%s.%X", TextTmp,
+ (memory_read8(PGM_MEM_ID, Address) & 7));
+ Address++;
+ break;
+ }
+ default: {
+ len += sprintf(&Text[len], "%s",
+ ArgsTextTbl[InstArgTbl[ArgTblOfs + i]]);
+ }
+ }
+ if (i < InstArgTbl[ArgTblOfs])
+ len += sprintf(&Text[len], ",");
+ }
+
+ return InstSize;
}
projects / emu8051.git / blobdiff