Mercurial > hg > Members > kono > os9 > sbc09
annotate src/v09.c @ 84:9b661787d5ed
2Mbyte
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Sat, 11 Aug 2018 18:16:04 +0900 |
| parents | 2e3d4b54ec2d |
| children | 4652761a60f9 |
| rev | line source |
|---|---|
| 0 | 1 /* 6809 Simulator V09. |
| 2 | |
| 3 Copyright 1994, L.C. Benschop, Eidnhoven The Netherlands. | |
| 4 This version of the program is distributed under the terms and conditions | |
| 5 of the GNU General Public License version 2. See the file COPYING. | |
| 6 THERE IS NO WARRANTY ON THIS PROGRAM!!! | |
| 7 | |
| 8 This program simulates a 6809 processor. | |
| 9 | |
| 10 System dependencies: short must be 16 bits. | |
| 11 char must be 8 bits. | |
| 12 long must be more than 16 bits. | |
| 13 arrays up to 65536 bytes must be supported. | |
| 14 machine must be twos complement. | |
| 15 Most Unix machines will work. For MSODS you need long pointers | |
| 16 and you may have to malloc() the mem array of 65536 bytes. | |
| 17 | |
| 18 Define BIG_ENDIAN if you have a big-endian machine (680x0 etc) | |
| 19 | |
| 20 Special instructions: | |
| 21 SWI2 writes char to stdout from register B. | |
| 22 SWI3 reads char from stdout to register B, sets carry at EOF. | |
| 23 (or when no key available when using term control). | |
| 24 SWI retains its normal function. | |
| 25 CWAI and SYNC stop simulator. | |
| 26 | |
| 27 */ | |
| 28 | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <strings.h> | |
| 33 #include <sys/stat.h> | |
| 34 | |
| 35 #define engine extern | |
| 36 | |
| 37 #include "v09.h" | |
| 38 | |
| 39 FILE *tracefile; | |
| 40 | |
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41 extern FILE *disk[]; |
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42 extern FILE *fp; // for disasm |
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43 extern char *prog; // for disasm |
| 0 | 44 extern void disasm(int,int); |
| 16 | 45 extern void do_mmu(Word,Byte); |
| 20 | 46 extern void init_term(void) ; |
| 64 | 47 #ifdef USE_VDISK |
| 48 extern int setVdisk(int drv,char *name) ; | |
| 49 #endif | |
| 50 | |
| 20 | 51 |
| 0 | 52 |
| 53 void do_trace(FILE *tracefile) | |
| 54 { | |
| 55 Word pc=pcreg; | |
| 56 Byte ir; | |
| 57 // fprintf(tracefile,"pc=%04x ",pc); | |
| 58 // ir=mem[pc++]; | |
| 59 // fprintf(tracefile,"i=%02x ",ir); if((ir&0xfe)==0x10) fprintf(tracefile,"%02x ",mem[pc]);else | |
| 60 // fprintf(tracefile," "); | |
| 61 fprintf(tracefile,"x=%04x y=%04x u=%04x s=%04x a=%02x b=%02x cc=%02x pc=", | |
| 62 xreg,yreg,ureg,sreg,*areg,*breg,ccreg); | |
| 63 fp = tracefile; | |
| 64 disasm(pc,pc); | |
| 65 } | |
| 66 | |
| 67 char *romfile = "v09.rom"; | |
| 9 | 68 long romstart = 0x8000; |
| 0 | 69 |
| 70 long | |
| 71 filesize(FILE *image) | |
| 72 { | |
| 73 struct stat buf; | |
| 74 fstat(fileno(image),&buf); | |
| 75 return buf.st_size; | |
| 76 } | |
| 77 | |
| 78 | |
| 79 void | |
| 80 read_image() | |
| 81 { | |
| 82 FILE *image; | |
| 83 if((image=fopen(romfile,"rb"))==NULL) | |
| 84 if((image=fopen("../v09.rom","rb"))==NULL) | |
| 85 if((image=fopen("..\\v09.rom","rb"))==NULL) { | |
| 86 perror("v09, image file"); | |
| 87 exit(2); | |
| 88 } | |
| 89 long len = filesize(image); | |
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90 /* |
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91 * |
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92 * 0x0000-0xdfff normal mem |
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93 * 0xxxxx-0xdfff rom |
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94 * 0xe000-0xe100 i/o |
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95 * 0xe000-0xffff rom |
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96 * |
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97 * discless boot |
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98 * rom image will be copyied from 0xed00-0x1xxxx |
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99 * boot copies 0x10000-0x1xxxx to os9's boot memory |
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100 */ |
| 16 | 101 #ifdef USE_MMU |
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102 /* |
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103 * In case of Coco, there is no ROM (switched out after boot ) |
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104 * 0x00000-0x0fdff normal mem |
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105 * 0x0fe00-0x0ffff ram fixed address ram including io |
| 84 | 106 * 0x10000-0x1fffff ram (2MB memory ) |
| 107 * >0x200000 lapround | |
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108 * |
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109 * discless boot |
| 84 | 110 * rom image will be copyied from 0x7eed00-0x7fxxxx (all ram) |
| 111 * boot copies 0x800000-0x8xxxx to os9's boot memory (ususally done by rel.asm ) | |
| 112 * (original system copies it from fd or hd) | |
| 113 * after that 0x800000-0x8xxxx will be all free | |
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114 */ |
| 84 | 115 phymem = malloc(memsize ); |
| 116 rommemsize = memsize ; | |
| 117 mem = phymem + 0x38*0x2000; | |
| 24 | 118 mmu = &mem[0xffa0]; |
| 16 | 119 prog = (char*)mem; |
| 9 | 120 if (romstart==0x8000) { |
| 33 | 121 romstart = memsize ; // full 512kb mem |
| 16 | 122 } |
| 84 | 123 fread(mem+ 0xe000,len,1,image); |
| 124 mem[0xff90] = 0; | |
| 33 | 125 mem[0xffa7] = 0x3f; |
| 9 | 126 #else |
| 16 | 127 if (romstart==0x8000) { |
| 9 | 128 romstart = 0x10000 - len; |
| 16 | 129 } |
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130 fread(mem+(romstart&0xffff),len,1,image); |
| 9 | 131 #endif |
| 0 | 132 fclose(image); |
| 133 } | |
| 134 | |
| 135 void usage(void) | |
| 136 { | |
| 9 | 137 fprintf(stderr,"Usage: v09 [-rom rom-image] [-l romstart] [-t tracefile [-tl addr] [-nt]" |
| 64 | 138 "[-[01] disk-image ] " |
| 139 #ifdef USE_VDISK | |
| 140 "[v vdisk-base-dir ] " | |
| 141 #endif | |
| 0 | 142 "[-th addr] ]\n[-e escchar] \n"); |
| 143 exit(1); | |
| 144 } | |
| 145 | |
| 146 | |
| 147 #define CHECKARG if(i==argc)usage();else i++; | |
| 148 | |
| 149 int | |
| 150 main(int argc,char *argv[]) | |
| 151 { | |
| 152 char *imagename=0; | |
| 153 int i; | |
| 154 int setterm = 1; | |
| 55 | 155 timerirq = 2; // use FIRQ default |
| 84 | 156 memsize = 512*1024*4; // full 2 mbute |
| 0 | 157 escchar='\x1d'; |
| 158 tracelo=0;tracehi=0xffff; | |
| 159 for(i=1;i<argc;i++) { | |
| 160 if (strcmp(argv[i],"-t")==0) { | |
| 161 i++; | |
| 162 if((tracefile=fopen(argv[i],"w"))==NULL) { | |
| 163 perror("v09, tracefile"); | |
| 164 exit(2); | |
| 165 } | |
| 166 tracing=1;attention=1; | |
| 167 } else if (strcmp(argv[i],"-rom")==0) { | |
| 168 i++; | |
| 61 | 169 timer = 3; // non standard rom image, don't start timer, and timder start call enabled |
| 55 | 170 timerirq = 1 ; // os9 cannot handle FIRQ |
| 0 | 171 romfile = argv[i]; |
| 9 | 172 |
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173 } else if (strcmp(argv[i],"-0")==0) { |
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174 i++; |
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175 disk[0] = fopen(argv[i],"r+"); |
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176 } else if (strcmp(argv[i],"-1")==0) { |
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177 i++; |
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178 disk[1] = fopen(argv[i],"r+"); |
| 64 | 179 #ifdef USE_VDISK |
| 180 } else if (strcmp(argv[i],"-v")==0) { | |
| 181 i++; | |
| 182 setVdisk(0,argv[i]); | |
| 183 #endif | |
| 0 | 184 } else if (strcmp(argv[i],"-tl")==0) { |
| 185 i++; | |
| 186 tracelo=strtol(argv[i],(char**)0,0); | |
| 187 } else if (strcmp(argv[i],"-th")==0) { | |
| 188 i++; | |
| 189 tracehi=strtol(argv[i],(char**)0,0); | |
| 190 } else if (strcmp(argv[i],"-e")==0) { | |
| 191 i++; | |
| 192 escchar=strtol(argv[i],(char**)0,0); | |
| 193 } else if (strcmp(argv[i],"-l")==0) { | |
| 194 i++; | |
| 195 romstart=strtol(argv[i],(char**)0,0); | |
| 1 | 196 } else if (strcmp(argv[i],"-nt")==0) { // start debugger at the start |
| 0 | 197 attention = escape = 1; |
| 61 | 198 timer = 1; // desable default timer interrupt and don't start timer on timer start IO |
| 4 | 199 } else if (strcmp(argv[i],"-m")==0) { |
| 200 i++; | |
| 201 memsize=strtol(argv[i],(char**)0,0) & ~0xffff; | |
| 202 if (memsize < 512*1024) memsize = 512*1024; | |
| 0 | 203 } else usage(); |
| 204 } | |
| 205 #ifdef MSDOS | |
| 206 if((mem=farmalloc(65535))==0) { | |
| 207 fprintf(stderr,"Not enough memory\n"); | |
| 208 exit(2); | |
| 209 } | |
| 210 #endif | |
| 211 read_image(); | |
| 20 | 212 init_term(); |
| 0 | 213 if (setterm) set_term(escchar); |
| 214 pcreg=(mem[0xfffe]<<8)+mem[0xffff]; | |
| 16 | 215 prog = (char*)mem; // for disasm |
| 0 | 216 interpr(); |
| 217 return 0; | |
| 218 } | |
| 219 |