Título: Alguien me explica este codigo
Publicado por: daniel7885 en 3 Marzo 2015, 01:59 am
no entiendo mucho en ensamblador es un codigo de c/c++ es de un emulador de sega llamado gens que emula el procesador 68k este es star_68k.h /* ** Starscream 680x0 emulation library ** Copyright 1997, 1998, 1999 Neill Corlett ** ** Refer to STARDOC.TXT for terms of use, API reference, and directions on ** how to compile. */
#ifndef __STARCPU_H__ #define __STARCPU_H__
#ifdef __cplusplus extern "C" { #endif
/* Remember to byte-swap these regions. (read STARDOC.TXT for details) */ struct STARSCREAM_PROGRAMREGION { unsigned lowaddr; unsigned highaddr; unsigned offset; };
struct STARSCREAM_DATAREGION { unsigned lowaddr; unsigned highaddr; void *memorycall; void *userdata; };
/* Memory structures for 16-bit data path */ #define STARSCREAM_CONTEXTINFO_MEM16 \ struct STARSCREAM_PROGRAMREGION *fetch; \ struct STARSCREAM_DATAREGION *readbyte; \ struct STARSCREAM_DATAREGION *readword; \ struct STARSCREAM_DATAREGION *writebyte; \ struct STARSCREAM_DATAREGION *writeword; \ struct STARSCREAM_PROGRAMREGION *s_fetch; \ struct STARSCREAM_DATAREGION *s_readbyte; \ struct STARSCREAM_DATAREGION *s_readword; \ struct STARSCREAM_DATAREGION *s_writebyte; \ struct STARSCREAM_DATAREGION *s_writeword; \ struct STARSCREAM_PROGRAMREGION *u_fetch; \ struct STARSCREAM_DATAREGION *u_readbyte; \ struct STARSCREAM_DATAREGION *u_readword; \ struct STARSCREAM_DATAREGION *u_writebyte; \ struct STARSCREAM_DATAREGION *u_writeword; \
/* Memory structures for 16-bit data path with function code support */ #define STARSCREAM_CONTEXTINFO_MEM16FC \ unsigned (*f_readbyte) (unsigned f, unsigned a); \ unsigned (*f_readword) (unsigned f, unsigned a); \ unsigned (*f_writebyte)(unsigned f, unsigned a); \ unsigned (*f_writeword)(unsigned f, unsigned a); \
/* Memory structures for 32-bit sizable data path */ #define STARSCREAM_CONTEXTINFO_MEM32 \ struct STARSCREAM_PROGRAMREGION *fetch; \ struct STARSCREAM_DATAREGION *readbus; \ struct STARSCREAM_DATAREGION *writebus; \ struct STARSCREAM_PROGRAMREGION *s_fetch; \ struct STARSCREAM_DATAREGION *s_readbus; \ struct STARSCREAM_DATAREGION *s_writebus; \ struct STARSCREAM_PROGRAMREGION *u_fetch; \ struct STARSCREAM_DATAREGION *u_readbus; \ struct STARSCREAM_DATAREGION *u_writebus; \ unsigned (*f_readbus) (unsigned f, unsigned a); \ unsigned (*f_writebus)(unsigned f, unsigned a); \
/* Common context info for all 680x0 types */ #define STARSCREAM_CONTEXTINFO_COMMON \ void (*resethandler)(void); \ unsigned dreg[8]; \ unsigned areg[8]; \ unsigned asp; \ unsigned pc; \ unsigned odometer; \ unsigned char interrupts[8]; \ unsigned short sr; \
/* 68000-specific context info */ #define STARSCREAM_CONTEXTINFO_68000SPECIFIC \ unsigned short contextfiller00; \
struct S68000CONTEXT { STARSCREAM_CONTEXTINFO_MEM16 STARSCREAM_CONTEXTINFO_COMMON STARSCREAM_CONTEXTINFO_68000SPECIFIC };
#define STARSCREAM_IDENTIFIERS(SNC,SN) \ \ extern struct SNC##CONTEXT SN##context; \ \ int SN##init (void); \ unsigned SN##reset (void); \ unsigned SN##exec (int n); \ int SN##interrupt (int level, int vector); \ void SN##flushInterrupts (void); \ int SN##GetContextSize (void); \ void SN##GetContext (void *context); \ void SN##SetContext (void *context); \ int SN##fetch (unsigned address); \ unsigned SN##readOdometer (void); \ unsigned SN##tripOdometer (void); \ unsigned SN##controlOdometer (int n); \ void SN##releaseTimeslice (void); \ void SN##releaseCycles (void); \ void SN##addCycles (int cycles); \ unsigned SN##readPC (void); \
STARSCREAM_IDENTIFIERS(S68000, main68k_) STARSCREAM_IDENTIFIERS(S68000, sub68k_)
#ifdef __cplusplus } #endif
#endif este es cpu_68k.h #include "star_68k.h"
#ifndef _CPU_68K_H #define _CPU_68K_H
extern struct S68000CONTEXT Context_68K; int M68K_Init(); int S68K_Init(); void M68K_Reset(int System_ID); void S68K_Reset(); void M68K_Reset_CPU(); void S68K_Reset_CPU(); void M68K_32X_Mode(); void M68K_Set_32X_Rom_Bank(); void M68K_Set_Prg_Ram(); void MS68K_Set_Word_Ram();
#endif este es cpu_g8k.c #include <stdio.h> #include <string.h> #include "port.h" #include "cpu_68k.h" #include "mem_m68k.h" #include "mem_s68k.h" #include "mem_sh2.h" #include "save.h" #include "ym2612.h" #include "misc.h" #include "gfx_cd.h"
#include "io.h" #include "cd_sys.h"
#define GENESIS 0 #define _32X 1 #define SEGACD 2
/*** global variables ***/
struct S68000CONTEXT Context_68K;
struct STARSCREAM_PROGRAMREGION M68K_Fetch[] = { {0x000000, 0x3FFFFF, (unsigned) 0x000000}, {0xFF0000, 0xFFFFFF, (unsigned) &Ram_68k[0] - 0xFF0000}, {0xF00000, 0xF0FFFF, (unsigned) &Ram_68k[0] - 0xF00000}, {0xEF0000, 0xEFFFFF, (unsigned) &Ram_68k[0] - 0xEF0000}, {-1, -1, (unsigned) NULL}, {-1, -1, (unsigned) NULL}, {-1, -1, (unsigned) NULL} };
struct STARSCREAM_DATAREGION M68K_Read_Byte[5] = { {0x000000, 0x3FFFFF, NULL, NULL}, {0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]}, {0x400000, 0xFEFFFF, (void *) M68K_RB, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_DATAREGION M68K_Read_Word[5] = { {0x000000, 0x3FFFFF, NULL, NULL}, {0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]}, {0x400000, 0xFEFFFF, (void *) M68K_RW, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_DATAREGION M68K_Write_Byte[] = { {0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]}, {0x000000, 0xFEFFFF, (void *) M68K_WB, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_DATAREGION M68K_Write_Word[] = { {0xFF0000, 0xFFFFFF, NULL, &Ram_68k[0]}, {0x000000, 0xFEFFFF, (void *) M68K_WW, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_PROGRAMREGION S68K_Fetch[] = { {0x000000, 0x07FFFF, (unsigned) &Ram_Prg[0]}, {-1, -1, (unsigned) NULL}, {-1, -1, (unsigned) NULL} };
struct STARSCREAM_DATAREGION S68K_Read_Byte[] = { {0x000000, 0x07FFFF, NULL, &Ram_Prg[0]}, {0x080000, 0xFFFFFF, (void *) S68K_RB, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_DATAREGION S68K_Read_Word[] = { {0x000000, 0x07FFFF, NULL, &Ram_Prg[0]}, {0x080000, 0xFFFFFF, (void *) S68K_RW, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_DATAREGION S68K_Write_Byte[] = { {0x000000, 0x07FFFF, NULL, &Ram_Prg[0]}, {0x080000, 0xFFFFFF, (void *) S68K_WB, NULL}, {-1, -1, NULL, NULL} };
struct STARSCREAM_DATAREGION S68K_Write_Word[] = { {0x000000, 0x07FFFF, NULL, &Ram_Prg[0]}, {0x080000, 0xFFFFFF, (void *) S68K_WW, NULL}, {-1, -1, NULL, NULL} };
void M68K_Reset_Handler () { // Init_Memory_M68K(GENESIS); }
void S68K_Reset_Handler () { // Init_Memory_M68K(SEGACD); }
/*** M68K_Init - initialise the main 68K ***/
int M68K_Init (void) { memset (&Context_68K, 0, sizeof (Context_68K));
Context_68K.s_fetch = Context_68K.u_fetch = Context_68K.fetch = M68K_Fetch; Context_68K.s_readbyte = Context_68K.u_readbyte = Context_68K.readbyte = M68K_Read_Byte; Context_68K.s_readword = Context_68K.u_readword = Context_68K.readword = M68K_Read_Word; Context_68K.s_writebyte = Context_68K.u_writebyte = Context_68K.writebyte = M68K_Write_Byte; Context_68K.s_writeword = Context_68K.u_writeword = Context_68K.writeword = M68K_Write_Word; Context_68K.resethandler = (void *) M68K_Reset_Handler;
main68k_SetContext (&Context_68K); main68k_init ();
return 1; }
/*** S68K_Init - initialise the sub 68K ***/
int S68K_Init (void) { memset (&Context_68K, 0, sizeof (Context_68K));
Context_68K.s_fetch = Context_68K.u_fetch = Context_68K.fetch = S68K_Fetch; Context_68K.s_readbyte = Context_68K.u_readbyte = Context_68K.readbyte = S68K_Read_Byte; Context_68K.s_readword = Context_68K.u_readword = Context_68K.readword = S68K_Read_Word; Context_68K.s_writebyte = Context_68K.u_writebyte = Context_68K.writebyte = S68K_Write_Byte; Context_68K.s_writeword = Context_68K.u_writeword = Context_68K.writeword = S68K_Write_Word; Context_68K.resethandler = (void *) S68K_Reset_Handler;
sub68k_SetContext (&Context_68K); sub68k_init ();
return 1; }
/*** M68K_Reset - general reset of the main 68K CPU ***/
void M68K_Reset (int System_ID) { memset (Ram_68k, 0, 64 * 1024);
M68K_Fetch[0].lowaddr = 0x000000; M68K_Fetch[0].highaddr = Rom_Size - 1; M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x000000;
M68K_Fetch[1].lowaddr = 0xFF0000; M68K_Fetch[1].highaddr = 0xFFFFFF; M68K_Fetch[1].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
if (System_ID == GENESIS) { M68K_Fetch[2].lowaddr = 0xF00000; M68K_Fetch[2].highaddr = 0xF0FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[3].lowaddr = 0xEF0000; M68K_Fetch[3].highaddr = 0xEFFFFF; M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[4].lowaddr = -1; M68K_Fetch[4].highaddr = -1; M68K_Fetch[4].offset = (unsigned) NULL;
} else if (System_ID == _32X) { Bank_SH2 = 0;
M68K_Fetch[2].lowaddr = 0xF00000; M68K_Fetch[2].highaddr = 0xF0FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[3].lowaddr = 0xEF0000; M68K_Fetch[3].highaddr = 0xEFFFFF; M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[4].lowaddr = -1; M68K_Fetch[4].highaddr = -1; M68K_Fetch[4].offset = (unsigned) NULL; } else if (System_ID == SEGACD) { Bank_M68K = 0;
MS68K_Set_Word_Ram ();
M68K_Fetch[3].lowaddr = 0x020000; M68K_Fetch[3].highaddr = 0x03FFFF; M68K_Set_Prg_Ram ();
M68K_Fetch[4].lowaddr = 0xF00000; M68K_Fetch[4].highaddr = 0xF0FFFF; M68K_Fetch[4].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[5].lowaddr = 0xEF0000; M68K_Fetch[5].highaddr = 0xEFFFFF; M68K_Fetch[5].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[6].lowaddr = -1; M68K_Fetch[6].highaddr = -1; M68K_Fetch[6].offset = (unsigned) NULL; }
main68k_reset ();
Init_Memory_M68K (System_ID); }
/*** S68K_Reset - general reset of the sub 68K CPU ***/
void S68K_Reset (void) { memset (Ram_Prg, 0, 512 * 1024); memset (Ram_Word_2M, 0, 256 * 1024); memset (Ram_Word_1M, 0, 256 * 1024);
memset (COMM.Command, 0, 8 * 5); memset (COMM.Status, 0, 8 * 5);
LED_Status = S68K_State = S68K_Mem_WP = S68K_Mem_PM = Ram_Word_State = 0; COMM.Flag = Init_Timer_INT3 = Timer_INT3 = Int_Mask_S68K = 0; Font_COLOR = Font_BITS = 0;
MS68K_Set_Word_Ram ();
sub68k_reset (); }
/*** M68K_32X_Mode - modify 32x mode *** *** - Called only during 32X emulation - ***/
void M68K_32X_Mode () { // if (_32X_ADEN && !_32X_RV) // 32X ON if (_32X_ADEN) // 32X ON { if (!_32X_RV) // ROM MOVED { M68K_Fetch[0].lowaddr = 0x880000; M68K_Fetch[0].highaddr = 0x8FFFFF; M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x880000;
M68K_Fetch[1].lowaddr = 0x900000; M68K_Fetch[1].highaddr = 0x9FFFFF; M68K_Set_32X_Rom_Bank ();
M68K_Fetch[2].lowaddr = 0xFF0000; M68K_Fetch[2].highaddr = 0xFFFFFF; M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
M68K_Fetch[3].lowaddr = 0x00; M68K_Fetch[3].highaddr = 0xFF; M68K_Fetch[3].offset = (unsigned) &_32X_Genesis_Rom[0] - 0x000000;
M68K_Fetch[4].lowaddr = 0xEF0000; M68K_Fetch[4].highaddr = 0xEFFFFF; M68K_Fetch[4].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[5].lowaddr = 0xF00000; M68K_Fetch[5].highaddr = 0xF0FFFF; M68K_Fetch[5].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[6].lowaddr = -1; M68K_Fetch[6].highaddr = -1; M68K_Fetch[6].offset = (unsigned) NULL;
M68K_Read_Byte_Table[0] = _32X_M68K_Read_Byte_Table[4 * 2]; M68K_Read_Word_Table[0] = _32X_M68K_Read_Word_Table[4 * 2]; } else // ROM NOT MOVED BUT BIOS PRESENT { M68K_Fetch[0].lowaddr = 0x000100; M68K_Fetch[0].highaddr = Rom_Size - 1; M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x000000;
M68K_Fetch[1].lowaddr = 0xFF0000; M68K_Fetch[1].highaddr = 0xFFFFFF; M68K_Fetch[1].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
M68K_Fetch[2].lowaddr = 0x00; M68K_Fetch[2].highaddr = 0xFF; M68K_Fetch[2].offset = (unsigned) &_32X_Genesis_Rom[0] - 0x000000;
M68K_Fetch[3].lowaddr = 0xF00000; M68K_Fetch[3].highaddr = 0xF0FFFF; M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[4].lowaddr = 0xEF0000; M68K_Fetch[4].highaddr = 0xEFFFFF; M68K_Fetch[4].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[5].lowaddr = -1; M68K_Fetch[5].highaddr = -1; M68K_Fetch[5].offset = (unsigned) NULL;
M68K_Read_Byte_Table[0] = _32X_M68K_Read_Byte_Table[4 * 2 + 1]; M68K_Read_Word_Table[0] = _32X_M68K_Read_Word_Table[4 * 2 + 1]; } } else { M68K_Fetch[0].lowaddr = 0x000000; M68K_Fetch[0].highaddr = Rom_Size - 1; M68K_Fetch[0].offset = (unsigned) &Rom_Data[0] - 0x000000;
M68K_Fetch[1].lowaddr = 0xFF0000; M68K_Fetch[1].highaddr = 0xFFFFFF; M68K_Fetch[1].offset = (unsigned) &Ram_68k[0] - 0xFF0000;
M68K_Fetch[2].lowaddr = 0xF00000; M68K_Fetch[2].highaddr = 0xF0FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_68k[0] - 0xF00000;
M68K_Fetch[3].lowaddr = 0xEF0000; M68K_Fetch[3].highaddr = 0xEFFFFF; M68K_Fetch[3].offset = (unsigned) &Ram_68k[0] - 0xEF0000;
M68K_Fetch[4].lowaddr = -1; M68K_Fetch[4].highaddr = -1; M68K_Fetch[4].offset = (unsigned) NULL;
M68K_Read_Byte_Table[0] = _32X_M68K_Read_Byte_Table[0]; M68K_Read_Word_Table[0] = _32X_M68K_Read_Word_Table[0]; } }
/*** M68K_Set_32X_Rom_Bank - modify 32x rom bank *** *** - Called only during 32X emulation - ***/
void M68K_Set_32X_Rom_Bank () { if (_32X_ADEN && !_32X_RV) { M68K_Fetch[1].offset = (unsigned) &Rom_Data[Bank_SH2 << 20] - 0x900000;
M68K_Read_Byte_Table[(9 * 2) + 0] = _32X_M68K_Read_Byte_Table[(Bank_SH2 << 1) + 0]; M68K_Read_Byte_Table[(9 * 2) + 1] = _32X_M68K_Read_Byte_Table[(Bank_SH2 << 1) + 1]; M68K_Read_Word_Table[(9 * 2) + 0] = _32X_M68K_Read_Word_Table[(Bank_SH2 << 1) + 0]; M68K_Read_Word_Table[(9 * 2) + 1] = _32X_M68K_Read_Word_Table[(Bank_SH2 << 1) + 1]; } else {
} }
/*** M68K_Set_Prg_Ram - modify bank Prg_Ram fetch *** *** - Called only during SEGA CD emulation - ***/
void M68K_Set_Prg_Ram () { M68K_Fetch[3].offset = (unsigned) &Ram_Prg[Bank_M68K] - 0x020000; }
/*** MS68K_Set_Word_Ram - modify bank Word_Ram fetch *** *** - Called only during SEGA CD emulation - ***/
void MS68K_Set_Word_Ram (void) { switch (Ram_Word_State) { case 0: // Mode 2M -> Assigned to Main CPU M68K_Fetch[2].lowaddr = 0x200000; M68K_Fetch[2].highaddr = 0x23FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_Word_2M[0] - 0x200000;
// S68K_Fetch[1].lowaddr = -1; // S68K_Fetch[1].highaddr = -1; // S68K_Fetch[1].offset = (unsigned) NULL;
S68K_Fetch[1].lowaddr = 0x080000; // why not after all... S68K_Fetch[1].highaddr = 0x0BFFFF; S68K_Fetch[1].offset = (unsigned) &Ram_Word_2M[0] - 0x080000; break;
case 1: // Mode 2M -> Assigned to Sub CPU // M68K_Fetch[2].lowaddr = -1; // M68K_Fetch[2].highaddr = -1; // M68K_Fetch[2].offset = (unsigned) NULL;
M68K_Fetch[2].lowaddr = 0x200000; // why not after all... M68K_Fetch[2].highaddr = 0x23FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_Word_2M[0] - 0x200000;
S68K_Fetch[1].lowaddr = 0x080000; S68K_Fetch[1].highaddr = 0x0BFFFF; S68K_Fetch[1].offset = (unsigned) &Ram_Word_2M[0] - 0x080000; break;
case 2: // Mode 1M -> Bank 0 to Main CPU M68K_Fetch[2].lowaddr = 0x200000; // Bank 0 M68K_Fetch[2].highaddr = 0x21FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_Word_1M[0] - 0x200000;
S68K_Fetch[1].lowaddr = 0x0C0000; // Bank 1 S68K_Fetch[1].highaddr = 0x0DFFFF; S68K_Fetch[1].offset = (unsigned) &Ram_Word_1M[0x20000] - 0x0C0000; break;
case 3: // Mode 1M -> Bank 0 to Sub CPU M68K_Fetch[2].lowaddr = 0x200000; // Bank 1 M68K_Fetch[2].highaddr = 0x21FFFF; M68K_Fetch[2].offset = (unsigned) &Ram_Word_1M[0x20000] - 0x200000;
S68K_Fetch[1].lowaddr = 0x0C0000; // Bank 0 S68K_Fetch[1].highaddr = 0x0DFFFF; S68K_Fetch[1].offset = (unsigned) &Ram_Word_1M[0] - 0x0C0000; break; } }
/*** M68K_Reset_CPU - just reset the main 68K cpu ***/
void M68K_Reset_CPU () { main68k_reset (); }
/*** S68K_Reset_CPU - just reset the sub 68K cpu ***/
void S68K_Reset_CPU () { sub68k_reset (); }
void _M68K_Set_32X_Rom_Bank () __attribute__ ((alias ("M68K_Set_32X_Rom_Bank"))); void _M68K_Set_Prg_Ram () __attribute__ ((alias ("M68K_Set_Prg_Ram"))); void _M68K_32X_Mode () __attribute__ ((alias ("M68K_32X_Mode"))); void _MS68K_Set_Word_Ram (void) __attribute__ ((alias ("MS68K_Set_Word_Ram")));
Título: Re: Alguien me explica este codigo
Publicado por: eferion en 3 Marzo 2015, 08:32 am
Yo pensaba que el día de los inocentes era en diciembre.
¿En serio pretendes que nos estudiemos ese código para dártelo mascado?
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