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lxdream.org :: lxdream/src/sh4/sh4.c
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4.c
changeset 412:d58e4d69de16
prev401:f79327f39818
next418:b9b14afa0959
author nkeynes
date Mon Oct 01 11:51:25 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Fix fr_bank on save file load
file annotate diff log raw
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/**
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 * $Id: sh4.c,v 1.3 2007-10-01 11:51:25 nkeynes Exp $
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 * 
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 * SH4 parent module for all CPU modes and SH4 peripheral
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 * modules.
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#define MODULE sh4_module
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#include <math.h>
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#include "dream.h"
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#include "sh4/sh4core.h"
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#include "sh4/sh4mmio.h"
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#include "sh4/intc.h"
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#include "mem.h"
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#include "clock.h"
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#include "syscall.h"
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#define EXV_EXCEPTION    0x100  /* General exception vector */
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#define EXV_TLBMISS      0x400  /* TLB-miss exception vector */
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#define EXV_INTERRUPT    0x600  /* External interrupt vector */
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void sh4_init( void );
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void sh4_reset( void );
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void sh4_start( void );
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void sh4_stop( void );
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void sh4_save_state( FILE *f );
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int sh4_load_state( FILE *f );
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uint32_t sh4_run_slice( uint32_t );
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uint32_t sh4_xlat_run_slice( uint32_t );
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struct dreamcast_module sh4_module = { "SH4", sh4_init, sh4_reset, 
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				       NULL, sh4_run_slice, sh4_stop,
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				       sh4_save_state, sh4_load_state };
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struct sh4_registers sh4r;
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struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];
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int sh4_breakpoint_count = 0;
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void sh4_set_use_xlat( gboolean use )
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{
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    if( use ) {
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	xlat_cache_init();
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	sh4_x86_init();
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	sh4_module.run_time_slice = sh4_xlat_run_slice;
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    } else {
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	sh4_module.run_time_slice = sh4_run_slice;
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    }
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}
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void sh4_init(void)
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{
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    register_io_regions( mmio_list_sh4mmio );
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    MMU_init();
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    sh4_reset();
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}
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void sh4_reset(void)
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{
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    /* zero everything out, for the sake of having a consistent state. */
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    memset( &sh4r, 0, sizeof(sh4r) );
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    /* Resume running if we were halted */
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    sh4r.sh4_state = SH4_STATE_RUNNING;
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    sh4r.pc    = 0xA0000000;
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    sh4r.new_pc= 0xA0000002;
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    sh4r.vbr   = 0x00000000;
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    sh4r.fpscr = 0x00040001;
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    sh4r.sr    = 0x700000F0;
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    sh4r.fr_bank = &sh4r.fr[0][0];
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    /* Mem reset will do this, but if we want to reset _just_ the SH4... */
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    MMIO_WRITE( MMU, EXPEVT, EXC_POWER_RESET );
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    /* Peripheral modules */
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    CPG_reset();
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    INTC_reset();
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    MMU_reset();
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    TMU_reset();
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    SCIF_reset();
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    sh4_stats_reset();
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}
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void sh4_stop(void)
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{
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}
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void sh4_save_state( FILE *f )
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{
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    if(	sh4_module.run_time_slice == sh4_xlat_run_slice ) {
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	/* If we were running with the translator, update new_pc and in_delay_slot */
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	sh4r.new_pc = sh4r.pc+2;
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	sh4r.in_delay_slot = FALSE;
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    }
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    fwrite( &sh4r, sizeof(sh4r), 1, f );
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    MMU_save_state( f );
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    INTC_save_state( f );
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    TMU_save_state( f );
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    SCIF_save_state( f );
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}
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int sh4_load_state( FILE * f )
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{
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    fread( &sh4r, sizeof(sh4r), 1, f );
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    sh4r.fr_bank = &sh4r.fr[(sh4r.fpscr&FPSCR_FR)>>21][0]; // Fixup internal FR pointer
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    MMU_load_state( f );
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    INTC_load_state( f );
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    TMU_load_state( f );
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    return SCIF_load_state( f );
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}
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void sh4_set_breakpoint( uint32_t pc, int type )
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{
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    sh4_breakpoints[sh4_breakpoint_count].address = pc;
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    sh4_breakpoints[sh4_breakpoint_count].type = type;
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    sh4_breakpoint_count++;
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}
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gboolean sh4_clear_breakpoint( uint32_t pc, int type )
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{
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    int i;
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    for( i=0; i<sh4_breakpoint_count; i++ ) {
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	if( sh4_breakpoints[i].address == pc && 
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	    sh4_breakpoints[i].type == type ) {
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	    while( ++i < sh4_breakpoint_count ) {
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		sh4_breakpoints[i-1].address = sh4_breakpoints[i].address;
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		sh4_breakpoints[i-1].type = sh4_breakpoints[i].type;
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	    }
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	    sh4_breakpoint_count--;
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	    return TRUE;
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	}
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    }
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    return FALSE;
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}
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int sh4_get_breakpoint( uint32_t pc )
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{
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    int i;
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    for( i=0; i<sh4_breakpoint_count; i++ ) {
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	if( sh4_breakpoints[i].address == pc )
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	    return sh4_breakpoints[i].type;
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    }
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    return 0;
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}
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void sh4_set_pc( int pc )
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{
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    sh4r.pc = pc;
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    sh4r.new_pc = pc+2;
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}
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/******************************* Support methods ***************************/
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static void sh4_switch_banks( )
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{
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    uint32_t tmp[8];
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    memcpy( tmp, sh4r.r, sizeof(uint32_t)*8 );
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    memcpy( sh4r.r, sh4r.r_bank, sizeof(uint32_t)*8 );
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    memcpy( sh4r.r_bank, tmp, sizeof(uint32_t)*8 );
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}
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void sh4_write_sr( uint32_t newval )
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{
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    if( (newval ^ sh4r.sr) & SR_RB )
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        sh4_switch_banks();
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    sh4r.sr = newval;
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    sh4r.t = (newval&SR_T) ? 1 : 0;
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    sh4r.s = (newval&SR_S) ? 1 : 0;
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    sh4r.m = (newval&SR_M) ? 1 : 0;
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    sh4r.q = (newval&SR_Q) ? 1 : 0;
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    intc_mask_changed();
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}
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uint32_t sh4_read_sr( void )
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{
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    /* synchronize sh4r.sr with the various bitflags */
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    sh4r.sr &= SR_MQSTMASK;
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    if( sh4r.t ) sh4r.sr |= SR_T;
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    if( sh4r.s ) sh4r.sr |= SR_S;
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    if( sh4r.m ) sh4r.sr |= SR_M;
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    if( sh4r.q ) sh4r.sr |= SR_Q;
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    return sh4r.sr;
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}
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#define RAISE( x, v ) do{			\
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    if( sh4r.vbr == 0 ) { \
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        ERROR( "%08X: VBR not initialized while raising exception %03X, halting", sh4r.pc, x ); \
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        dreamcast_stop(); return FALSE;	\
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    } else { \
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        sh4r.spc = sh4r.pc;	\
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        sh4r.ssr = sh4_read_sr(); \
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        sh4r.sgr = sh4r.r[15]; \
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        MMIO_WRITE(MMU,EXPEVT,x); \
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        sh4r.pc = sh4r.vbr + v; \
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        sh4r.new_pc = sh4r.pc + 2; \
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        sh4_write_sr( sh4r.ssr |SR_MD|SR_BL|SR_RB ); \
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	if( sh4r.in_delay_slot ) { \
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	    sh4r.in_delay_slot = 0; \
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	    sh4r.spc -= 2; \
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	} \
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    } \
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    return TRUE; } while(0)
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/**
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 * Raise a general CPU exception for the specified exception code.
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 * (NOT for TRAPA or TLB exceptions)
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 */
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gboolean sh4_raise_exception( int code )
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{
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    RAISE( code, EXV_EXCEPTION );
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}
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gboolean sh4_raise_trap( int trap )
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{
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    MMIO_WRITE( MMU, TRA, trap<<2 );
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    return sh4_raise_exception( EXC_TRAP );
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}
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gboolean sh4_raise_slot_exception( int normal_code, int slot_code ) {
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    if( sh4r.in_delay_slot ) {
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	return sh4_raise_exception(slot_code);
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    } else {
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	return sh4_raise_exception(normal_code);
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    }
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}
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gboolean sh4_raise_tlb_exception( int code )
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{
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    RAISE( code, EXV_TLBMISS );
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}
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void sh4_accept_interrupt( void )
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{
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    uint32_t code = intc_accept_interrupt();
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    sh4r.ssr = sh4_read_sr();
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    sh4r.spc = sh4r.pc;
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    sh4r.sgr = sh4r.r[15];
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    sh4_write_sr( sh4r.ssr|SR_BL|SR_MD|SR_RB );
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    MMIO_WRITE( MMU, INTEVT, code );
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    sh4r.pc = sh4r.vbr + 0x600;
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    sh4r.new_pc = sh4r.pc + 2;
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    //    WARN( "Accepting interrupt %03X, from %08X => %08X", code, sh4r.spc, sh4r.pc );
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}
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void signsat48( void )
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{
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    if( ((int64_t)sh4r.mac) < (int64_t)0xFFFF800000000000LL )
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	sh4r.mac = 0xFFFF800000000000LL;
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    else if( ((int64_t)sh4r.mac) > (int64_t)0x00007FFFFFFFFFFFLL )
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	sh4r.mac = 0x00007FFFFFFFFFFFLL;
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}
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void sh4_fsca( uint32_t anglei, float *fr )
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{
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    float angle = (((float)(anglei&0xFFFF))/65536.0) * 2 * M_PI;
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    *fr++ = cosf(angle);
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    *fr = sinf(angle);
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}
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void sh4_sleep(void)
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{
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    if( MMIO_READ( CPG, STBCR ) & 0x80 ) {
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	sh4r.sh4_state = SH4_STATE_STANDBY;
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    } else {
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	sh4r.sh4_state = SH4_STATE_SLEEP;
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    }
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}
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/**
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 * Compute the matrix tranform of fv given the matrix xf.
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 * Both fv and xf are word-swapped as per the sh4r.fr banks
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 */
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void sh4_ftrv( float *target, float *xf )
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{
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    float fv[4] = { target[1], target[0], target[3], target[2] };
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    target[1] = xf[1] * fv[0] + xf[5]*fv[1] +
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	xf[9]*fv[2] + xf[13]*fv[3];
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    target[0] = xf[0] * fv[0] + xf[4]*fv[1] +
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	xf[8]*fv[2] + xf[12]*fv[3];
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    target[3] = xf[3] * fv[0] + xf[7]*fv[1] +
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	xf[11]*fv[2] + xf[15]*fv[3];
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    target[2] = xf[2] * fv[0] + xf[6]*fv[1] +
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	xf[10]*fv[2] + xf[14]*fv[3];
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}
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.