license info at top of Cyclone source files

[cyclone68000.git] / Cyclone / Main.cpp

\r
// This file is part of the Cyclone 68000 Emulator\r
\r
// This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r
// You can choose the license that has the most advantages for you.\r
\r
// SVN repository can be found at http://code.google.com/p/cyclone68000/\r
\r
#include "app.h"\r
\r
static FILE *AsmFile=NULL;\r
\r
static int CycloneVer=0x0069; // Version number of library\r
int *CyJump=NULL; // Jump table\r
int ms=0; // If non-zero, output in Microsoft ARMASM format\r
char *Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2\r
char *Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2\r
int Cycles=0; // Current cycles for opcode\r
int Amatch=1; // If one, try to match A68K timing\r
int Accu=-1; // Accuracy\r
int Debug=0; // Debug info\r
\r
void ot(char *format, ...)\r
{\r
  va_list valist=NULL;\r
  va_start(valist,format);\r
  if (AsmFile) vfprintf(AsmFile,format,valist);\r
  va_end(valist);\r
}\r
\r
void ltorg()\r
{\r
  if (ms) ot("  LTORG\n");\r
  else    ot("  .ltorg\n");\r
}\r
\r
static void PrintException()\r
{\r
  ot("  ;@ Cause an Exception - Vector in [r7,#0x50]\n");\r
  ot("  ldr r10,[r7,#0x60] ;@ Get Memory base\n");\r
  ot("  sub r1,r4,r10 ;@ r1 = Old PC\n");\r
  OpPush32();\r
  OpPushSr(1);\r
  ot("  ldr r0,[r7,#0x50] ;@ Get Vector\n");\r
  ot(";@ Read IRQ Vector:\n");\r
  MemHandler(0,2);\r
  ot("  add r0,r0,r10 ;@ r0 = Memory Base + New PC\n");\r
  ot("  mov lr,pc\n");\r
  ot("  ldr pc,[r7,#0x64] ;@ Call checkpc()\n");\r
  ot("  mov r4,r0\n");\r
  ot("\n");\r
\r
  // todo - make Interrupt code use this function as well\r
}\r
\r
// Trashes r0\r
void CheckInterrupt()\r
{\r
  ot(";@ CheckInterrupt:\n");\r
  ot("  ldrb r0,[r7,#0x47] ;@ Get IRQ level\n");\r
  ot("  tst r0,r0\n");\r
  ot("  blne DoInterrupt\n");\r
  ot("\n");\r
}\r
\r
static void PrintFramework()\r
{\r
  ot(";@ --------------------------- Framework --------------------------\n");\r
  if (ms) ot("CycloneRun\n");\r
  else    ot("CycloneRun:\n");\r
\r
  ot("  stmdb sp!,{r4-r11,lr}\n");\r
\r
  ot("  mov r7,r0          ;@ r7 = Pointer to Cpu Context\n");\r
  ot("                     ;@ r0-3 = Temporary registers\n");\r
  ot("  ldrb r9,[r7,#0x46] ;@ r9 = Flags (NZCV)\n");\r
  ot("  ldr r6,=JumpTab    ;@ r6 = Opcode Jump table\n");\r
  ot("  ldr r5,[r7,#0x5c]  ;@ r5 = Cycles\n");\r
  ot("  ldr r4,[r7,#0x40]  ;@ r4 = Current PC + Memory Base\n");\r
  ot("                     ;@ r8 = Current Opcode\n");\r
  ot("  mov r9,r9,lsl #28  ;@ r9 = Flags 0xf0000000, cpsr format\n");\r
  ot("                     ;@ r10 = Source value / Memory Base\n");\r
  ot("\n");\r
  CheckInterrupt();\r
  ot(";@ Check if interrupt used up all the cycles:\n");\r
  ot("  subs r5,r5,#0\n");\r
  ot("  blt CycloneEndNoBack\n");\r
\r
  OpFirst();\r
  ltorg();\r
  ot("\n");\r
\r
  ot(";@ We come back here after execution\n");\r
  ot("CycloneEnd%s\n", ms?"":":");\r
  ot("  sub r4,r4,#2\n");\r
  ot("CycloneEndNoBack%s\n", ms?"":":");\r
  ot("  mov r9,r9,lsr #28\n");\r
  ot("  str r4,[r7,#0x40]  ;@ Save Current PC + Memory Base\n");\r
  ot("  str r5,[r7,#0x5c]  ;@ Save Cycles\n");\r
  ot("  strb r9,[r7,#0x46] ;@ Save Flags (NZCV)\n");\r
  ot("  ldmia sp!,{r4-r11,pc}\n");\r
  ot("\n");\r
\r
  ot(";@ DoInterrupt - r0=IRQ number\n");\r
  ot("DoInterrupt%s\n", ms?"":":");\r
  ot("\n");\r
  ot("  ldrb r1,[r7,#0x44] ;@ Get SR high: T_S__III\n");\r
  ot("  and r1,r1,#7 ;@ Get interrupt mask\n");\r
  ot("  cmp r0,#6 ;@ irq>6 ?\n");\r
  ot("  cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");\r
  ot("  movle pc,lr ;@ irq<=6 and mask, not allowed\n");\r
  ot("\n");\r
  ot("  ldr r10,[r7,#0x60] ;@ Get Memory base\n");\r
  ot("  mov r11,lr ;@ Preserve ARM return address\n");\r
  ot("  sub r1,r4,r10 ;@ r1 = Old PC\n");\r
  OpPush32();\r
  OpPushSr(1);\r
  ot(";@ Get IRQ Vector address:\n");\r
  ot("  ldrb r1,[r7,#0x47] ;@ IRQ\n");\r
  ot("  mov r0,r1,asl #2\n");\r
  ot("  add r0,r0,#0x60\n");\r
  ot(";@ Read IRQ Vector:\n");\r
  MemHandler(0,2);\r
  ot("  add r0,r0,r10 ;@ r0 = Memory Base + New PC\n");\r
  ot("  mov lr,pc\n");\r
  ot("  ldr pc,[r7,#0x64] ;@ Call checkpc()\n");\r
  ot("  mov r4,r0\n");\r
  ot("\n");\r
  ot(";@ todo - swap OSP and A7 if not in Supervisor mode\n");\r
  ot("  ldrb r0,[r7,#0x47] ;@ IRQ\n");\r
  ot("  orr r0,r0,#0x20 ;@ Supervisor mode + IRQ number\n");\r
  ot("  strb r0,[r7,#0x44] ;@ Put SR high\n");\r
  ot("\n");\r
  ot(";@ Clear irq:\n");\r
  ot("  mov r0,#0\n");\r
  ot("  strb r0,[r7,#0x47]\n");\r
  ot("  subs r5,r5,#%d ;@ Subtract cycles\n",46);\r
  ot("  mov pc,r11 ;@ Return\n");\r
  ot("\n");\r
\r
  ot("Exception%s\n", ms?"":":");\r
  ot("\n");\r
  ot("  mov r11,lr ;@ Preserve ARM return address\n");\r
  PrintException();\r
  ot("  mov pc,r11 ;@ Return\n");\r
  ot("\n");\r
}\r
\r
// ---------------------------------------------------------------------------\r
// Call Read(r0), Write(r0,r1) or Fetch(r0)\r
// Trashes r0-r3\r
int MemHandler(int type,int size)\r
{\r
  int func=0;\r
  func=0x68+type*0xc+(size<<2); // Find correct offset\r
\r
  if (Debug&4) ot("  str r4,[r7,#0x40] ;@ Save PC\n");\r
  if (Debug&3) ot("  str r5,[r7,#0x5c] ;@ Save Cycles\n");\r
\r
  ot("  mov lr,pc\n");\r
  ot("  ldr pc,[r7,#0x%x] ;@ Call ",func);\r
\r
  // Document what we are calling:\r
  if (type==0) ot("read");\r
  if (type==1) ot("write");\r
  if (type==2) ot("fetch");\r
\r
  if (type==1) ot("%d(r0,r1)",8<<size);\r
  else         ot("%d(r0)",   8<<size);\r
  ot(" handler\n");\r
\r
  if (Debug&2) ot("  ldr r5,[r7,#0x5c] ;@ Load Cycles\n");\r
  return 0;\r
}\r
\r
static void PrintOpcodes()\r
{\r
  int op=0;\r
 \r
  printf("Creating Opcodes: [");\r
\r
  ot(";@ ---------------------------- Opcodes ---------------------------\n");\r
\r
  // Emit null opcode:\r
  ot("Op____%s ;@ Called if an opcode is not recognised\n", ms?"":":");\r
  OpStart(-1); Cycles=4; OpEnd(); //test\r
\r
  ot("  b CycloneEnd\n\n");\r
\r
  for (op=0;op<0x10000;op++)\r
  {\r
    if ((op&0xfff)==0) { printf("%x",op>>12); fflush(stdout); } // Update progress\r
\r
    OpAny(op);\r
  }\r
\r
  ot("\n");\r
\r
  printf("]\n");\r
}\r
\r
static void PrintJumpTable()\r
{\r
  int i=0,op=0,len=0;\r
\r
  ot(";@ -------------------------- Jump Table --------------------------\n");\r
  ot("JumpTab%s\n", ms?"":":");\r
\r
  len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table\r
  for (i=0;i<len;i++)\r
  {\r
    op=CyJump[i];\r
\r
    if ((i&7)==0) ot(ms?"  dcd ":"  .long ");\r
    if (op<0) ot("Op____"); else ot("Op%.4x",op);\r
    \r
    if ((i&7)==7) ot(" ;@ %.4x\n",i-7);\r
    else if (i+1<len) ot(",");\r
  }\r
\r
  ot("\n");\r
}\r
\r
static int CycloneMake()\r
{\r
  char *name="Cyclone.s";\r
  \r
  // Open the assembly file\r
  if (ms) name="Cyclone.asm";\r
  AsmFile=fopen(name,"wt"); if (AsmFile==NULL) return 1;\r
  \r
  printf("Making %s...\n",name);\r
\r
  ot("\n;@ Cyclone 68000 Emulator v%x.%.3x - Assembler Output\n\n",CycloneVer>>12,CycloneVer&0xfff);\r
\r
  ot(";@ This code is licensed under the GNU General Public License version 2.0 and the MAME License.\n");\r
  ot(";@ You can choose the license that has the most advantages for you.\n\n");\r
  ot(";@ SVN repository can be found at http://code.google.com/p/cyclone68000/\n\n");\r
\r
  CyJump=(int *)malloc(0x40000); if (CyJump==NULL) return 1;\r
  memset(CyJump,0xff,0x40000); // Init to -1\r
\r
  if (ms)\r
  {\r
    ot("  area |.text|, code\n");\r
    ot("  export CycloneRun\n");\r
    ot("  export CycloneVer\n");\r
    ot("\n");\r
    ot("CycloneVer dcd 0x%.4x\n",CycloneVer);\r
  }\r
  else\r
  {\r
    ot("  .global CycloneRun\n");\r
    ot("  .global CycloneVer\n");\r
    ot("CycloneVer: .long 0x%.4x\n",CycloneVer);\r
  }\r
  ot("\n");\r
\r
  PrintFramework();\r
  PrintOpcodes();\r
  PrintJumpTable();\r
\r
  if (ms) ot("  END\n");\r
\r
  fclose(AsmFile); AsmFile=NULL;\r
\r
  printf("Assembling...\n");\r
  // Assemble the file\r
  if (ms) system("armasm Cyclone.asm");\r
  else    system("as -o Cyclone.o Cyclone.s");\r
  printf("Done!\n\n");\r
\r
  free(CyJump);\r
  return 0;\r
}\r
\r
int main()\r
{\r
  printf("\n  Cyclone 68000 Emulator v%x.%.3x - Core Creator\n\n",CycloneVer>>12,CycloneVer&0xfff);\r
\r
  // Make GAS and ARMASM versions\r
  for (ms=0;ms<2;ms++) CycloneMake();\r
  return 0;\r
}\r