X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=cyclone68000.git;a=blobdiff_plain;f=Cyclone%2FMain.cpp;h=1f532a0d93d52ab597c467a8861d972cdd4cce77;hp=0e031697864af16d524bc719fbf036192ebbafc2;hb=d9d77995ec88700f438b3638df179a014bf4f6b3;hpb=7441f043a0ba83bd919db25bf3b8e35ae635012a diff --git a/Cyclone/Main.cpp b/Cyclone/Main.cpp index 0e03169..1f532a0 100644 --- a/Cyclone/Main.cpp +++ b/Cyclone/Main.cpp @@ -1,30 +1,104 @@ // This file is part of the Cyclone 68000 Emulator -// Copyright (c) 2011 FinalDave (emudave (at) gmail.com) +// Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com) +// Copyright (c) 2005-2011 Gražvydas "notaz" Ignotas (notasas (at) gmail.com) // This code is licensed under the GNU General Public License version 2.0 and the MAME License. // You can choose the license that has the most advantages for you. // SVN repository can be found at http://code.google.com/p/cyclone68000/ + #include "app.h" static FILE *AsmFile=NULL; -static int CycloneVer=0x0069; // Version number of library +static int CycloneVer=0x0099; // Version number of library int *CyJump=NULL; // Jump table -int ms=0; // If non-zero, output in Microsoft ARMASM format -char *Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2 -char *Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2 -int Cycles=0; // Current cycles for opcode -int Amatch=1; // If one, try to match A68K timing -int Accu=-1; // Accuracy -int Debug=0; // Debug info +int ms=USE_MS_SYNTAX; // If non-zero, output in Microsoft ARMASM format +const char * const Narm[4]={ "b", "h","",""}; // Normal ARM Extensions for operand sizes 0,1,2 +const char * const Sarm[4]={"sb","sh","",""}; // Sign-extend ARM Extensions for operand sizes 0,1,2 +int Cycles; // Current cycles for opcode +int pc_dirty; // something changed PC during processing +int arm_op_count; + +// opcodes often used by games +static const unsigned short hot_opcodes[] = { + 0x6701, // beq $3 + 0x6601, // bne $3 + 0x51c8, // dbra Dn, $2 + 0x4a38, // tst.b $0.w + 0xd040, // add.w Dn, Dn + 0x4a79, // tst.w $0.l + 0x0240, // andi.w #$0, D0 + 0x2038, // move.l $0.w, D0 + 0xb0b8, // cmp.l $0.w, D0 + 0x6001, // bra $3 + 0x30c0, // move.w D0, (A0)+ + 0x3028, // move.w ($0,A0), D0 + 0x0c40, // cmpi.w #$0, D0 + 0x0c79, // cmpi.w #$0, $0.l + 0x4e75, // rts + 0x4e71, // nop + 0x3000, // move.w D0, D0 + 0x0839, // btst #$0, $0.l + 0x7000, // moveq #$0, D0 + 0x3040, // movea.w D0, A0 + 0x0838, // btst #$0, $0.w + 0x4a39, // tst.b $0.l + 0x33d8, // move.w (A0)+, $0.l + 0x6700, // beq $2 + 0xb038, // cmp.b $0.w, D0 + 0x3039, // move.w $0.l, D0 + 0x4840, // swap D0 + 0x6101, // bsr $3 + 0x6100, // bsr $2 + 0x5e40, // addq.w #7, D0 + 0x1039, // move.b $0.l, D0 + 0x20c0, // move.l D0, (A0)+ + 0x1018, // move.b (A0)+, D0 + 0x30d0, // move.w (A0), (A0)+ + 0x3080, // move.w D0, (A0) + 0x3018, // move.w (A0)+, D0 + 0xc040, // and.w D0, D0 + 0x3180, // move.w D0, (A0,D0.w) + 0x1198, // move.b (A0)+, (A0,D0.w) + 0x6501, // bcs $3 + 0x6500, // bcs $2 + 0x6401, // bcc $3 + 0x6a01, // bpl $3 + 0x41f0, // lea (A0,D0.w), A0 + 0x4a28, // tst.b ($0,A0) + 0x0828, // btst #$0, ($0,A0) + 0x0640, // addi.w #$0, D0 + 0x10c0, // move.b D0, (A0)+ + 0x10d8, // move.b (A0)+, (A0)+ +}; +#define hot_opcode_count (int)(sizeof(hot_opcodes) / sizeof(hot_opcodes[0])) + +static int is_op_hot(int op) +{ + int i; + for (i = 0; i < hot_opcode_count; i++) + if (op == hot_opcodes[i]) + return 1; + return 0; +} void ot(const char *format, ...) { va_list valist; + int i, len; + + // notaz: stop me from leaving newlines in the middle of format string + // and generating bad code + for(i=0, len=strlen(format); i < len && format[i] != '\n'; i++); + if(i < len-1 && format[len-1] != '\n') printf("\nWARNING: possible improper newline placement:\n%s\n", format); + + if (format[0] == ' ' && format[1] == ' ' && format[2] != ' ' && format[2] != '.') + arm_op_count++; + va_start(valist,format); if (AsmFile) vfprintf(AsmFile,format,valist); va_end(valist); @@ -36,164 +110,990 @@ void ltorg() else ot(" .ltorg\n"); } -static void PrintException() +#if (CYCLONE_FOR_GENESIS == 2) +// r12=ptr to tas in table, trashes r0,r1 +static void ChangeTAS(int norm) { - ot(" ;@ Cause an Exception - Vector in [r7,#0x50]\n"); - ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n"); - ot(" sub r1,r4,r10 ;@ r1 = Old PC\n"); - OpPush32(); - OpPushSr(1); - ot(" ldr r0,[r7,#0x50] ;@ Get Vector\n"); - ot(";@ Read IRQ Vector:\n"); - MemHandler(0,2); - ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n"); - ot(" mov lr,pc\n"); - ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); - ot(" mov r4,r0\n"); - ot("\n"); - - // todo - make Interrupt code use this function as well + ot(" ldr r0,=Op4ad0%s\n",norm?"_":""); + ot(" mov r1,#8\n"); + ot("setrtas_loop%i0%s ;@ 4ad0-4ad7\n",norm,ms?"":":"); + ot(" subs r1,r1,#1\n"); + ot(" str r0,[r12],#4\n"); + ot(" bne setrtas_loop%i0\n",norm); + ot(" ldr r0,=Op4ad8%s\n",norm?"_":""); + ot(" mov r1,#7\n"); + ot("setrtas_loop%i1%s ;@ 4ad8-4ade\n",norm,ms?"":":"); + ot(" subs r1,r1,#1\n"); + ot(" str r0,[r12],#4\n"); + ot(" bne setrtas_loop%i1\n",norm); + ot(" ldr r0,=Op4adf%s\n",norm?"_":""); + ot(" str r0,[r12],#4\n"); + ot(" ldr r0,=Op4ae0%s\n",norm?"_":""); + ot(" mov r1,#7\n"); + ot("setrtas_loop%i2%s ;@ 4ae0-4ae6\n",norm,ms?"":":"); + ot(" subs r1,r1,#1\n"); + ot(" str r0,[r12],#4\n"); + ot(" bne setrtas_loop%i2\n",norm); + ot(" ldr r0,=Op4ae7%s\n",norm?"_":""); + ot(" str r0,[r12],#4\n"); + ot(" ldr r0,=Op4ae8%s\n",norm?"_":""); + ot(" mov r1,#8\n"); + ot("setrtas_loop%i3%s ;@ 4ae8-4aef\n",norm,ms?"":":"); + ot(" subs r1,r1,#1\n"); + ot(" str r0,[r12],#4\n"); + ot(" bne setrtas_loop%i3\n",norm); + ot(" ldr r0,=Op4af0%s\n",norm?"_":""); + ot(" mov r1,#8\n"); + ot("setrtas_loop%i4%s ;@ 4af0-4af7\n",norm,ms?"":":"); + ot(" subs r1,r1,#1\n"); + ot(" str r0,[r12],#4\n"); + ot(" bne setrtas_loop%i4\n",norm); + ot(" ldr r0,=Op4af8%s\n",norm?"_":""); + ot(" str r0,[r12],#4\n"); + ot(" ldr r0,=Op4af9%s\n",norm?"_":""); + ot(" str r0,[r12],#4\n"); } +#endif -// Trashes r0 -void CheckInterrupt() +#if EMULATE_ADDRESS_ERRORS_JUMP || EMULATE_ADDRESS_ERRORS_IO +static void AddressErrorWrapper(char rw, const char *dataprg, int iw) { - ot(";@ CheckInterrupt:\n"); - ot(" ldrb r0,[r7,#0x47] ;@ Get IRQ level\n"); - ot(" tst r0,r0\n"); - ot(" blne DoInterrupt\n"); + ot("ExceptionAddressError_%c_%s%s\n", rw, dataprg, ms?"":":"); + ot(" ldr r1,[r7,#0x44]\n"); + ot(" mov r6,#0x%02x\n", iw); + ot(" mov r11,r0\n"); + ot(" tst r1,#0x20\n"); + ot(" orrne r6,r6,#4\n"); + ot(" b ExceptionAddressError\n"); ot("\n"); } +#endif + +void FlushPC(void) +{ +#if MEMHANDLERS_NEED_PC + if (pc_dirty) + ot(" str r4,[r7,#0x40] ;@ Save PC\n"); +#endif + pc_dirty = 0; +} static void PrintFramework() { + int state_flags_to_check = 1; // stopped +#if EMULATE_TRACE + state_flags_to_check |= 2; // tracing +#endif +#if EMULATE_HALT + state_flags_to_check |= 0x10; // halted +#endif + ot(";@ --------------------------- Framework --------------------------\n"); if (ms) ot("CycloneRun\n"); else ot("CycloneRun:\n"); - ot(" stmdb sp!,{r4-r11,lr}\n"); + ot(" stmdb sp!,{r4-r8,r10,r11,lr}\n"); ot(" mov r7,r0 ;@ r7 = Pointer to Cpu Context\n"); ot(" ;@ r0-3 = Temporary registers\n"); - ot(" ldrb r9,[r7,#0x46] ;@ r9 = Flags (NZCV)\n"); - ot(" ldr r6,=JumpTab ;@ r6 = Opcode Jump table\n"); + ot(" ldrb r10,[r7,#0x46] ;@ r10 = Flags (NZCV)\n"); + ot(" ldr r6,=CycloneJumpTab ;@ r6 = Opcode Jump table\n"); ot(" ldr r5,[r7,#0x5c] ;@ r5 = Cycles\n"); ot(" ldr r4,[r7,#0x40] ;@ r4 = Current PC + Memory Base\n"); ot(" ;@ r8 = Current Opcode\n"); - ot(" mov r9,r9,lsl #28 ;@ r9 = Flags 0xf0000000, cpsr format\n"); - ot(" ;@ r10 = Source value / Memory Base\n"); + ot(" ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n"); + ot(" mov r10,r10,lsl #28;@ r10 = Flags 0xf0000000, cpsr format\n"); + ot(" ;@ r11 = Source value / Memory Base\n"); + ot(" str r6,[r7,#0x54] ;@ make a copy to avoid literal pools\n"); + ot("\n"); +#if (CYCLONE_FOR_GENESIS == 2) || EMULATE_TRACE + ot(" mov r2,#0\n"); + ot(" str r2,[r7,#0x98] ;@ clear custom CycloneEnd\n"); +#endif + ot(";@ CheckInterrupt:\n"); + ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47] + ot(" beq NoInts0\n"); + ot(" cmp r0,#6 ;@ irq>6 ?\n"); + ot(" andle r1,r1,#7 ;@ Get interrupt mask\n"); + ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n"); + ot(" bgt CycloneDoInterrupt\n"); + ot("NoInts0%s\n", ms?"":":"); + ot("\n"); + ot(";@ Check if our processor is in special state\n"); + ot(";@ and jump to opcode handler if not\n"); + ot(" ldr r0,[r7,#0x58] ;@ state_flags\n"); + ot(" ldrh r8,[r4],#2 ;@ Fetch first opcode\n"); + ot(" tst r0,#0x%02x ;@ special state?\n", state_flags_to_check); + ot(" ldreq pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); + ot("\n"); + ot("CycloneSpecial%s\n", ms?"":":"); +#if EMULATE_TRACE + ot(" tst r0,#2 ;@ tracing?\n"); + ot(" bne CycloneDoTrace\n"); +#endif + ot(";@ stopped or halted\n"); + ot(" mov r5,#0\n"); + ot(" str r5,[r7,#0x5C] ;@ eat all cycles\n"); + ot(" ldmia sp!,{r4-r8,r10,r11,pc} ;@ we are stopped, do nothing!\n"); ot("\n"); - CheckInterrupt(); - ot(";@ Check if interrupt used up all the cycles:\n"); - ot(" subs r5,r5,#0\n"); - ot(" blt CycloneEndNoBack\n"); - - OpFirst(); - ltorg(); ot("\n"); ot(";@ We come back here after execution\n"); ot("CycloneEnd%s\n", ms?"":":"); ot(" sub r4,r4,#2\n"); ot("CycloneEndNoBack%s\n", ms?"":":"); - ot(" mov r9,r9,lsr #28\n"); +#if (CYCLONE_FOR_GENESIS == 2) || EMULATE_TRACE + ot(" ldr r1,[r7,#0x98]\n"); + ot(" mov r10,r10,lsr #28\n"); + ot(" tst r1,r1\n"); + ot(" bxne r1 ;@ jump to alternative CycloneEnd\n"); +#else + ot(" mov r10,r10,lsr #28\n"); +#endif ot(" str r4,[r7,#0x40] ;@ Save Current PC + Memory Base\n"); ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n"); - ot(" strb r9,[r7,#0x46] ;@ Save Flags (NZCV)\n"); - ot(" ldmia sp!,{r4-r11,pc}\n"); + ot(" strb r10,[r7,#0x46] ;@ Save Flags (NZCV)\n"); + ot(" ldmia sp!,{r4-r8,r10,r11,pc}\n"); + ltorg(); ot("\n"); - - ot(";@ DoInterrupt - r0=IRQ number\n"); - ot("DoInterrupt%s\n", ms?"":":"); ot("\n"); - ot(" ldrb r1,[r7,#0x44] ;@ Get SR high: T_S__III\n"); - ot(" and r1,r1,#7 ;@ Get interrupt mask\n"); - ot(" cmp r0,#6 ;@ irq>6 ?\n"); - ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n"); - ot(" movle pc,lr ;@ irq<=6 and mask, not allowed\n"); + + ot("CycloneInit%s\n", ms?"":":"); +#if COMPRESS_JUMPTABLE + ot(";@ decompress jump table\n"); + ot(" ldr r12,=CycloneJumpTab\n"); + ot(" add r0,r12,#0xe000*4 ;@ ctrl code pointer\n"); + ot(" ldr r1,[r0,#-4]\n"); + ot(" tst r1,r1\n"); + ot(" movne pc,lr ;@ already uncompressed\n"); + ot(" add r3,r12,#0xa000*4 ;@ handler table pointer, r12=dest\n"); + ot("unc_loop%s\n", ms?"":":"); + ot(" ldrh r1,[r0],#2\n"); + ot(" and r2,r1,#0xf\n"); + ot(" bic r1,r1,#0xf\n"); + ot(" ldr r1,[r3,r1,lsr #2] ;@ r1=handler\n"); + ot(" cmp r2,#0xf\n"); + ot(" addeq r2,r2,#1 ;@ 0xf is really 0x10\n"); + ot(" tst r2,r2\n"); + ot(" ldreqh r2,[r0],#2 ;@ counter is in next word\n"); + ot(" tst r2,r2\n"); + ot(" beq unc_finish ;@ done decompressing\n"); + ot(" tst r1,r1\n"); + ot(" addeq r12,r12,r2,lsl #2 ;@ 0 handler means we should skip those bytes\n"); + ot(" beq unc_loop\n"); + ot("unc_loop_in%s\n", ms?"":":"); + ot(" subs r2,r2,#1\n"); + ot(" str r1,[r12],#4\n"); + ot(" bgt unc_loop_in\n"); + ot(" b unc_loop\n"); + ot("unc_finish%s\n", ms?"":":"); + ot(" ldr r12,=CycloneJumpTab\n"); + ot(" ;@ set a-line and f-line handlers\n"); + ot(" add r0,r12,#0xa000*4\n"); + ot(" ldr r1,[r0,#4] ;@ a-line handler\n"); + ot(" ldr r3,[r0,#8] ;@ f-line handler\n"); + ot(" mov r2,#0x1000\n"); + ot("unc_fill3%s\n", ms?"":":"); + ot(" subs r2,r2,#1\n"); + ot(" str r1,[r0],#4\n"); + ot(" bgt unc_fill3\n"); + ot(" add r0,r12,#0xf000*4\n"); + ot(" mov r2,#0x1000\n"); + ot("unc_fill4%s\n", ms?"":":"); + ot(" subs r2,r2,#1\n"); + ot(" str r3,[r0],#4\n"); + ot(" bgt unc_fill4\n"); + ot(" bx lr\n"); + ltorg(); +#else + ot(";@ do nothing\n"); + ot(" bx lr\n"); +#endif ot("\n"); - ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n"); - ot(" mov r11,lr ;@ Preserve ARM return address\n"); - ot(" sub r1,r4,r10 ;@ r1 = Old PC\n"); - OpPush32(); - OpPushSr(1); - ot(";@ Get IRQ Vector address:\n"); - ot(" ldrb r1,[r7,#0x47] ;@ IRQ\n"); - ot(" mov r0,r1,asl #2\n"); - ot(" add r0,r0,#0x60\n"); - ot(";@ Read IRQ Vector:\n"); + + // -------------- + ot("CycloneReset%s\n", ms?"":":"); + ot(" stmfd sp!,{r7,lr}\n"); + ot(" mov r7,r0\n"); + ot(" mov r0,#0\n"); + ot(" str r0,[r7,#0x58] ;@ state_flags\n"); + ot(" str r0,[r7,#0x48] ;@ OSP\n"); + ot(" mov r1,#0x27 ;@ Supervisor mode\n"); + ot(" strb r1,[r7,#0x44] ;@ set SR high\n"); + ot(" strb r0,[r7,#0x47] ;@ IRQ\n"); MemHandler(0,2); - ot(" add r0,r0,r10 ;@ r0 = Memory Base + New PC\n"); + ot(" str r0,[r7,#0x3c] ;@ Stack pointer\n"); + ot(" mov r0,#0\n"); + ot(" str r0,[r7,#0x60] ;@ Membase\n"); + ot(" mov r0,#4\n"); + MemHandler(0,2); +#ifdef MEMHANDLERS_DIRECT_PREFIX + ot(" bl %scheckpc ;@ Call checkpc()\n", MEMHANDLERS_DIRECT_PREFIX); +#else ot(" mov lr,pc\n"); ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); +#endif + ot(" str r0,[r7,#0x40] ;@ PC + base\n"); + ot(" ldmfd sp!,{r7,pc}\n"); + ot("\n"); + + // -------------- + // 68k: XNZVC, ARM: NZCV + ot("CycloneSetSr%s\n", ms?"":":"); + ot(" mov r2,r1,lsr #8\n"); +// ot(" ldrb r3,[r0,#0x44] ;@ get SR high\n"); +// ot(" eor r3,r3,r2\n"); +// ot(" tst r3,#0x20\n"); +#if EMULATE_TRACE + ot(" and r2,r2,#0xa7 ;@ only defined bits\n"); +#else + ot(" and r2,r2,#0x27 ;@ only defined bits\n"); +#endif + ot(" strb r2,[r0,#0x44] ;@ set SR high\n"); + ot(" mov r2,r1,lsl #25\n"); + ot(" str r2,[r0,#0x4c] ;@ the X flag\n"); + ot(" bic r2,r1,#0xf3\n"); + ot(" tst r1,#1\n"); + ot(" orrne r2,r2,#2\n"); + ot(" tst r1,#2\n"); + ot(" orrne r2,r2,#1\n"); + ot(" strb r2,[r0,#0x46] ;@ flags\n"); + ot(" bx lr\n"); + ot("\n"); + + // -------------- + ot("CycloneGetSr%s\n", ms?"":":"); + ot(" ldrb r1,[r0,#0x46] ;@ flags\n"); + ot(" bic r2,r1,#0xf3\n"); + ot(" tst r1,#1\n"); + ot(" orrne r2,r2,#2\n"); + ot(" tst r1,#2\n"); + ot(" orrne r2,r2,#1\n"); + ot(" ldr r1,[r0,#0x4c] ;@ the X flag\n"); + ot(" tst r1,#0x20000000\n"); + ot(" orrne r2,r2,#0x10\n"); + ot(" ldrb r1,[r0,#0x44] ;@ the SR high\n"); + ot(" orr r0,r2,r1,lsl #8\n"); + ot(" bx lr\n"); + ot("\n"); + + // -------------- + ot("CyclonePack%s\n", ms?"":":"); + ot(" stmfd sp!,{r4,r5,lr}\n"); ot(" mov r4,r0\n"); + ot(" mov r5,r1\n"); + ot(" mov r3,#16\n"); + ot(";@ 0x00-0x3f: DA registers\n"); + ot("c_pack_loop%s\n",ms?"":":"); + ot(" ldr r1,[r0],#4\n"); + ot(" subs r3,r3,#1\n"); + ot(" str r1,[r5],#4\n"); + ot(" bne c_pack_loop\n"); + ot(";@ 0x40: PC\n"); + ot(" ldr r0,[r4,#0x40] ;@ PC + Memory Base\n"); + ot(" ldr r1,[r4,#0x60] ;@ Memory base\n"); + ot(" sub r0,r0,r1\n"); + ot(" str r0,[r5],#4\n"); + ot(";@ 0x44: SR\n"); + ot(" mov r0,r4\n"); + ot(" bl CycloneGetSr\n"); + ot(" strh r0,[r5],#2\n"); + ot(";@ 0x46: IRQ level\n"); + ot(" ldrb r0,[r4,#0x47]\n"); + ot(" strb r0,[r5],#2\n"); + ot(";@ 0x48: other SP\n"); + ot(" ldr r0,[r4,#0x48]\n"); + ot(" str r0,[r5],#4\n"); + ot(";@ 0x4c: CPU state flags\n"); + ot(" ldr r0,[r4,#0x58]\n"); + ot(" str r0,[r5],#4\n"); + ot(" ldmfd sp!,{r4,r5,pc}\n"); + ot("\n"); + + // -------------- + ot("CycloneUnpack%s\n", ms?"":":"); + ot(" stmfd sp!,{r5,r7,lr}\n"); + ot(" mov r7,r0\n"); + ot(" movs r5,r1\n"); + ot(" beq c_unpack_do_pc\n"); + ot(" mov r3,#16\n"); + ot(";@ 0x00-0x3f: DA registers\n"); + ot("c_unpack_loop%s\n",ms?"":":"); + ot(" ldr r1,[r5],#4\n"); + ot(" subs r3,r3,#1\n"); + ot(" str r1,[r0],#4\n"); + ot(" bne c_unpack_loop\n"); + ot(";@ 0x40: PC\n"); + ot(" ldr r0,[r5],#4 ;@ PC\n"); + ot(" str r0,[r7,#0x40] ;@ handle later\n"); + ot(";@ 0x44: SR\n"); + ot(" ldrh r1,[r5],#2\n"); + ot(" mov r0,r7\n"); + ot(" bl CycloneSetSr\n"); + ot(";@ 0x46: IRQ level\n"); + ot(" ldrb r0,[r5],#2\n"); + ot(" strb r0,[r7,#0x47]\n"); + ot(";@ 0x48: other SP\n"); + ot(" ldr r0,[r5],#4\n"); + ot(" str r0,[r7,#0x48]\n"); + ot(";@ 0x4c: CPU state flags\n"); + ot(" ldr r0,[r5],#4\n"); + ot(" str r0,[r7,#0x58]\n"); + ot("c_unpack_do_pc%s\n",ms?"":":"); + ot(" ldr r0,[r7,#0x40] ;@ unbased PC\n"); +#if USE_CHECKPC_CALLBACK + ot(" mov r1,#0\n"); + ot(" str r1,[r7,#0x60] ;@ Memory base\n"); + #ifdef MEMHANDLERS_DIRECT_PREFIX + ot(" bl %scheckpc ;@ Call checkpc()\n", MEMHANDLERS_DIRECT_PREFIX); + #else + ot(" mov lr,pc\n"); + ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); + #endif +#else + ot(" ldr r1,[r7,#0x60] ;@ Memory base\n"); + ot(" add r0,r0,r1 ;@ r0 = Memory Base + New PC\n"); +#endif + ot(" str r0,[r7,#0x40] ;@ PC + Memory Base\n"); + ot(" ldmfd sp!,{r5,r7,pc}\n"); + ot("\n"); + + // -------------- + ot("CycloneFlushIrq%s\n", ms?"":":"); + ot(" ldr r1,[r0,#0x44] ;@ Get SR high T_S__III and irq level\n"); + ot(" mov r2,r1,lsr #24 ;@ Get IRQ level\n"); // same as ldrb r0,[r7,#0x47] + ot(" cmp r2,#6 ;@ irq>6 ?\n"); + ot(" andle r1,r1,#7 ;@ Get interrupt mask\n"); + ot(" cmple r2,r1 ;@ irq<=6: Is irq<=mask ?\n"); + ot(" movle r0,#0\n"); + ot(" bxle lr ;@ no ints\n"); + ot("\n"); + ot(" stmdb sp!,{r4,r5,r7,r8,r10,r11,lr}\n"); + ot(" mov r7,r0\n"); + ot(" mov r0,r2\n"); + ot(" ldrb r10,[r7,#0x46] ;@ r10 = Flags (NZCV)\n"); + ot(" mov r5,#0\n"); + ot(" ldr r4,[r7,#0x40] ;@ r4 = Current PC + Memory Base\n"); + ot(" mov r10,r10,lsl #28 ;@ r10 = Flags 0xf0000000, cpsr format\n"); + ot(" adr r2,CycloneFlushIrqEnd\n"); + ot(" str r2,[r7,#0x98] ;@ set custom CycloneEnd\n"); + ot(" b CycloneDoInterrupt\n"); + ot("\n"); + ot("CycloneFlushIrqEnd%s\n", ms?"":":"); + ot(" rsb r0,r5,#0\n"); + ot(" str r4,[r7,#0x40] ;@ Save Current PC + Memory Base\n"); + ot(" strb r10,[r7,#0x46] ;@ Save Flags (NZCV)\n"); + ot(" ldmia sp!,{r4,r5,r7,r8,r10,r11,lr}\n"); + ot(" bx lr\n"); + ot("\n"); + ot("\n"); + + // -------------- + ot("CycloneSetRealTAS%s\n", ms?"":":"); +#if (CYCLONE_FOR_GENESIS == 2) + ot(" ldr r12,=CycloneJumpTab\n"); + ot(" tst r0,r0\n"); + ot(" add r12,r12,#0x4a00*4\n"); + ot(" add r12,r12,#0x00d0*4\n"); + ot(" beq setrtas_off\n"); + ChangeTAS(1); + ot(" bx lr\n"); + ot("setrtas_off%s\n",ms?"":":"); + ChangeTAS(0); + ot(" bx lr\n"); + ltorg(); +#else + ot(" bx lr\n"); +#endif + ot("\n"); + + // -------------- + ot(";@ DoInterrupt - r0=IRQ level\n"); + ot("CycloneDoInterruptGoBack%s\n", ms?"":":"); + ot(" sub r4,r4,#2\n"); + ot("CycloneDoInterrupt%s\n", ms?"":":"); + ot(" bic r8,r8,#0xff000000\n"); + ot(" orr r8,r8,r0,lsl #29 ;@ abuse r8\n"); + + // Steps are from "M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL", p. 6-4 + // but their order is based on http://pasti.fxatari.com/68kdocs/68kPrefetch.html + // 1. Make a temporary copy of the status register and set the status register for exception processing. + ot(" ldr r2,[r7,#0x58] ;@ state flags\n"); + ot(" and r0,r0,#7\n"); + ot(" orr r3,r0,#0x20 ;@ Supervisor mode + IRQ level\n"); + ot(" bic r2,r2,#3 ;@ clear stopped and trace states\n"); +#if EMULATE_ADDRESS_ERRORS_JUMP || EMULATE_ADDRESS_ERRORS_IO + ot(" orr r2,r2,#4 ;@ set activity bit: 'not processing instruction'\n"); +#endif + ot(" str r2,[r7,#0x58]\n"); + ot(" ldrb r6,[r7,#0x44] ;@ Get old SR high, abuse r6\n"); + ot(" strb r3,[r7,#0x44] ;@ Put new SR high\n"); ot("\n"); - ot(";@ todo - swap OSP and A7 if not in Supervisor mode\n"); - ot(" ldrb r0,[r7,#0x47] ;@ IRQ\n"); - ot(" orr r0,r0,#0x20 ;@ Supervisor mode + IRQ number\n"); - ot(" strb r0,[r7,#0x44] ;@ Put SR high\n"); + + // 3. Save the current processor context. + ot(" ldr r1,[r7,#0x60] ;@ Get Memory base\n"); + ot(" ldr r11,[r7,#0x3c] ;@ Get A7\n"); + ot(" tst r6,#0x20\n"); + ot(";@ get our SP:\n"); + ot(" ldreq r2,[r7,#0x48] ;@ ...or OSP as our stack pointer\n"); + ot(" streq r11,[r7,#0x48]\n"); + ot(" moveq r11,r2\n"); + ot(";@ Push old PC onto stack\n"); + ot(" sub r0,r11,#4 ;@ Predecremented A7\n"); + ot(" sub r1,r4,r1 ;@ r1 = Old PC\n"); + MemHandler(1,2); + ot(";@ Push old SR:\n"); + ot(" ldr r0,[r7,#0x4c] ;@ X bit\n"); + ot(" mov r1,r10,lsr #28 ;@ ____NZCV\n"); + ot(" eor r2,r1,r1,ror #1 ;@ Bit 0=C^V\n"); + ot(" tst r2,#1 ;@ 1 if C!=V\n"); + ot(" eorne r1,r1,#3 ;@ ____NZVC\n"); + ot(" and r0,r0,#0x20000000\n"); + ot(" orr r1,r1,r0,lsr #25 ;@ ___XNZVC\n"); + ot(" orr r1,r1,r6,lsl #8 ;@ Include old SR high\n"); + ot(" sub r0,r11,#6 ;@ Predecrement A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,1,0,0); // already checked for address error by prev MemHandler ot("\n"); + + // 2. Obtain the exception vector. + ot(" mov r11,r8,lsr #29\n"); + ot(" mov r0,r11\n"); +#if USE_INT_ACK_CALLBACK + ot(";@ call IrqCallback if it is defined\n"); +#if INT_ACK_NEEDS_STUFF + ot(" str r4,[r7,#0x40] ;@ Save PC\n"); + ot(" mov r1,r10,lsr #28\n"); + ot(" strb r1,[r7,#0x46] ;@ Save Flags (NZCV)\n"); + ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n"); +#endif + ot(" ldr r3,[r7,#0x8c] ;@ IrqCallback\n"); + ot(" add lr,pc,#4*3\n"); + ot(" tst r3,r3\n"); + ot(" streqb r3,[r7,#0x47] ;@ just clear IRQ if there is no callback\n"); + ot(" mvneq r0,#0 ;@ and simulate -1 return\n"); + ot(" bxne r3\n"); +#if INT_ACK_CHANGES_CYCLES + ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n"); +#endif + ot(";@ get IRQ vector address:\n"); + ot(" cmn r0,#1 ;@ returned -1?\n"); + ot(" addeq r0,r11,#0x18 ;@ use autovector then\n"); + ot(" cmn r0,#2 ;@ returned -2?\n"); // should be safe as above add should never result in -2 + ot(" moveq r0,#0x18 ;@ use spurious interrupt then\n"); +#else // !USE_INT_ACK_CALLBACK ot(";@ Clear irq:\n"); - ot(" mov r0,#0\n"); - ot(" strb r0,[r7,#0x47]\n"); - ot(" subs r5,r5,#%d ;@ Subtract cycles\n",46); - ot(" mov pc,r11 ;@ Return\n"); + ot(" mov r2,#0\n"); + ot(" strb r2,[r7,#0x47]\n"); + ot(" add r0,r0,#0x18 ;@ use autovector\n"); +#endif + ot(" mov r0,r0,lsl #2 ;@ get vector address\n"); + ot("\n"); + ot(" ldr r11,[r7,#0x60] ;@ Get Memory base\n"); + ot(";@ Read IRQ Vector:\n"); + MemHandler(0,2,0,0); + ot(" tst r0,r0 ;@ uninitialized int vector?\n"); + ot(" moveq r0,#0x3c\n"); + #ifdef MEMHANDLERS_DIRECT_PREFIX + ot(" bleq %sread32 ;@ Call read32(r0) handler\n", MEMHANDLERS_DIRECT_PREFIX); + #else + ot(" moveq lr,pc\n"); + ot(" ldreq pc,[r7,#0x70] ;@ Call read32(r0) handler\n"); + #endif +#if USE_CHECKPC_CALLBACK + ot(" add lr,pc,#4\n"); + ot(" add r0,r0,r11 ;@ r0 = Memory Base + New PC\n"); + #ifdef MEMHANDLERS_DIRECT_PREFIX + ot(" bl %scheckpc ;@ Call checkpc()\n", MEMHANDLERS_DIRECT_PREFIX); + #else + ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); + #endif + #if EMULATE_ADDRESS_ERRORS_JUMP + ot(" mov r4,r0\n"); + #else + ot(" bic r4,r0,#1\n"); + #endif +#else + ot(" add r4,r0,r11 ;@ r4 = Memory Base + New PC\n"); + #if EMULATE_ADDRESS_ERRORS_JUMP + ot(" bic r4,r4,#1\n"); + #endif +#endif ot("\n"); - ot("Exception%s\n", ms?"":":"); + // 4. Obtain a new context and resume instruction processing. + // note: the obtain part was already done in previous steps +#if EMULATE_ADDRESS_ERRORS_JUMP + ot(" tst r4,#1\n"); + ot(" bne ExceptionAddressError_r_prg_r4\n"); +#endif + ot(" ldr r6,[r7,#0x54]\n"); + ot(" ldrh r8,[r4],#2 ;@ Fetch next opcode\n"); + ot(" subs r5,r5,#44 ;@ Subtract cycles\n"); + ot(" ldrge pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); + ot(" b CycloneEnd\n"); ot("\n"); + + // -------------- + // trashes all temp regs + ot("Exception%s\n", ms?"":":"); + ot(" ;@ Cause an Exception - Vector number in r0\n"); ot(" mov r11,lr ;@ Preserve ARM return address\n"); - PrintException(); - ot(" mov pc,r11 ;@ Return\n"); + ot(" bic r8,r8,#0xff000000\n"); + ot(" orr r8,r8,r0,lsl #24 ;@ abuse r8\n"); + + // 1. Make a temporary copy of the status register and set the status register for exception processing. + ot(" ldr r6,[r7,#0x44] ;@ Get old SR high, abuse r6\n"); + ot(" ldr r2,[r7,#0x58] ;@ state flags\n"); + ot(" and r3,r6,#0x27 ;@ clear trace and unused flags\n"); + ot(" orr r3,r3,#0x20 ;@ set supervisor mode\n"); + ot(" bic r2,r2,#3 ;@ clear stopped and trace states\n"); + ot(" str r2,[r7,#0x58]\n"); + ot(" strb r3,[r7,#0x44] ;@ Put new SR high\n"); + ot("\n"); + + // 3. Save the current processor context. + ot(" ldr r0,[r7,#0x3c] ;@ Get A7\n"); + ot(" tst r6,#0x20\n"); + ot(";@ get our SP:\n"); + ot(" ldreq r2,[r7,#0x48] ;@ ...or OSP as our stack pointer\n"); + ot(" streq r0,[r7,#0x48]\n"); + ot(" moveq r0,r2\n"); + ot(";@ Push old PC onto stack\n"); + ot(" ldr r1,[r7,#0x60] ;@ Get Memory base\n"); + ot(" sub r0,r0,#4 ;@ Predecremented A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + ot(" sub r1,r4,r1 ;@ r1 = Old PC\n"); + MemHandler(1,2); + ot(";@ Push old SR:\n"); + ot(" ldr r0,[r7,#0x4c] ;@ X bit\n"); + ot(" mov r1,r10,lsr #28 ;@ ____NZCV\n"); + ot(" eor r2,r1,r1,ror #1 ;@ Bit 0=C^V\n"); + ot(" tst r2,#1 ;@ 1 if C!=V\n"); + ot(" eorne r1,r1,#3 ;@ ____NZVC\n"); + ot(" and r0,r0,#0x20000000\n"); + ot(" orr r1,r1,r0,lsr #25 ;@ ___XNZVC\n"); + ot(" ldr r0,[r7,#0x3c] ;@ A7\n"); + ot(" orr r1,r1,r6,lsl #8 ;@ Include SR high\n"); + ot(" sub r0,r0,#2 ;@ Predecrement A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,1,0,0); + ot("\n"); + + // 2. Obtain the exception vector + ot(";@ Read Exception Vector:\n"); + ot(" mov r0,r8,lsr #24\n"); + ot(" mov r0,r0,lsl #2\n"); + MemHandler(0,2,0,0); + ot(" ldr r3,[r7,#0x60] ;@ Get Memory base\n"); +#if USE_CHECKPC_CALLBACK + ot(" add lr,pc,#4\n"); + ot(" add r0,r0,r3 ;@ r0 = Memory Base + New PC\n"); + #ifdef MEMHANDLERS_DIRECT_PREFIX + ot(" bl %scheckpc ;@ Call checkpc()\n", MEMHANDLERS_DIRECT_PREFIX); + #else + ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); + #endif + #if EMULATE_ADDRESS_ERRORS_JUMP + ot(" mov r4,r0\n"); + #else + ot(" bic r4,r0,#1\n"); + #endif +#else + ot(" add r4,r0,r3 ;@ r4 = Memory Base + New PC\n"); + #if EMULATE_ADDRESS_ERRORS_JUMP + ot(" bic r4,r4,#1\n"); + #endif +#endif ot("\n"); + + // 4. Resume execution. +#if EMULATE_ADDRESS_ERRORS_JUMP + ot(" tst r4,#1\n"); + ot(" bne ExceptionAddressError_r_prg_r4\n"); +#endif + ot(" ldr r6,[r7,#0x54]\n"); + ot(" bx r11 ;@ Return\n"); + ot("\n"); + + // -------------- +#if EMULATE_ADDRESS_ERRORS_JUMP || EMULATE_ADDRESS_ERRORS_IO + // first some wrappers: I see no point inlining this code, + // as it will be executed in really rare cases. + AddressErrorWrapper('r', "data", 0x11); + AddressErrorWrapper('r', "prg", 0x12); + AddressErrorWrapper('w', "data", 0x01); + // there are no program writes + // cpu space is only for bus errors? + ot("ExceptionAddressError_r_prg_r4%s\n", ms?"":":"); + ot(" ldr r1,[r7,#0x44]\n"); + ot(" ldr r3,[r7,#0x60] ;@ Get Memory base\n"); + ot(" mov r6,#0x12\n"); + ot(" sub r11,r4,r3\n"); + ot(" tst r1,#0x20\n"); + ot(" orrne r6,r6,#4\n"); + ot("\n"); + + ot("ExceptionAddressError%s\n", ms?"":":"); + ot(";@ r6 - info word (without instruction/not bit), r11 - faulting address\n"); + + // 1. Make a temporary copy of the status register and set the status register for exception processing. + ot(" ldrb r0,[r7,#0x44] ;@ Get old SR high\n"); + ot(" ldr r2,[r7,#0x58] ;@ state flags\n"); + ot(" and r3,r0,#0x27 ;@ clear trace and unused flags\n"); + ot(" orr r3,r3,#0x20 ;@ set supervisor mode\n"); + ot(" strb r3,[r7,#0x44] ;@ Put new SR high\n"); + ot(" bic r2,r2,#3 ;@ clear stopped and trace states\n"); + ot(" tst r2,#4\n"); + ot(" orrne r6,r6,#8 ;@ complete info word\n"); + ot(" orr r2,r2,#4 ;@ set activity bit: 'not processing instruction'\n"); +#if EMULATE_HALT + ot(" tst r2,#8\n"); + ot(" orrne r2,r2,#0x10 ;@ HALT\n"); + ot(" orr r2,r2,#8 ;@ processing address error\n"); + ot(" str r2,[r7,#0x58]\n"); + ot(" movne r5,#0\n"); + ot(" bne CycloneEndNoBack ;@ bye bye\n"); +#else + ot(" str r2,[r7,#0x58]\n"); +#endif + ot(" and r10,r10,#0xf0000000\n"); + ot(" orr r10,r10,r0,lsl #4 ;@ some preparations for SR push\n"); + ot("\n"); + + // 3. Save the current processor context + additional information. + ot(" ldr r0,[r7,#0x3c] ;@ Get A7\n"); + ot(" tst r10,#0x200\n"); + ot(";@ get our SP:\n"); + ot(" ldreq r2,[r7,#0x48] ;@ ...or OSP as our stack pointer\n"); + ot(" streq r0,[r7,#0x48]\n"); + ot(" moveq r0,r2\n"); + // PC + ot(";@ Push old PC onto stack\n"); + ot(" ldr r1,[r7,#0x60] ;@ Get Memory base\n"); + ot(" sub r0,r0,#4 ;@ Predecremented A7\n"); + ot(" sub r1,r4,r1 ;@ r1 = Old PC\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,2,0,EMULATE_HALT); + // SR + ot(";@ Push old SR:\n"); + ot(" ldr r0,[r7,#0x4c] ;@ X bit\n"); + ot(" mov r1,r10,ror #28 ;@ ____NZCV\n"); + ot(" eor r2,r1,r1,ror #1 ;@ Bit 0=C^V\n"); + ot(" tst r2,#1 ;@ 1 if C!=V\n"); + ot(" eorne r1,r1,#3 ;@ ____NZVC\n"); + ot(" and r0,r0,#0x20000000\n"); + ot(" orr r1,r1,r0,lsr #25 ;@ ___XNZVC\n"); + ot(" ldr r0,[r7,#0x3c] ;@ A7\n"); + ot(" and r10,r10,#0xf0000000\n"); + ot(" sub r0,r0,#2 ;@ Predecrement A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,1,0,0); + // IR (instruction register) + ot(";@ Push IR:\n"); + ot(" ldr r0,[r7,#0x3c] ;@ A7\n"); + ot(" mov r1,r8\n"); + ot(" sub r0,r0,#2 ;@ Predecrement A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,1,0,0); + // access address + ot(";@ Push address:\n"); + ot(" ldr r0,[r7,#0x3c] ;@ A7\n"); + ot(" mov r1,r11\n"); + ot(" sub r0,r0,#4 ;@ Predecrement A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,2,0,0); + // information word + ot(";@ Push info word:\n"); + ot(" ldr r0,[r7,#0x3c] ;@ A7\n"); + ot(" mov r1,r6\n"); + ot(" sub r0,r0,#2 ;@ Predecrement A7\n"); + ot(" str r0,[r7,#0x3c] ;@ Save A7\n"); + MemHandler(1,1,0,0); + ot("\n"); + + // 2. Obtain the exception vector + ot(";@ Read Exception Vector:\n"); + ot(" mov r0,#0x0c\n"); + MemHandler(0,2,0,0); + ot(" ldr r3,[r7,#0x60] ;@ Get Memory base\n"); +#if USE_CHECKPC_CALLBACK + ot(" add lr,pc,#4\n"); + ot(" add r0,r0,r3 ;@ r0 = Memory Base + New PC\n"); + #ifdef MEMHANDLERS_DIRECT_PREFIX + ot(" bl %scheckpc ;@ Call checkpc()\n", MEMHANDLERS_DIRECT_PREFIX); + #else + ot(" ldr pc,[r7,#0x64] ;@ Call checkpc()\n"); + #endif + ot(" mov r4,r0\n"); +#else + ot(" add r4,r0,r3 ;@ r4 = Memory Base + New PC\n"); +#endif + ot("\n"); + +#if EMULATE_ADDRESS_ERRORS_JUMP && EMULATE_HALT + ot(" tst r4,#1\n"); + ot(" bne ExceptionAddressError_r_prg_r4\n"); +#else + ot(" bic r4,r4,#1\n"); +#endif + + // 4. Resume execution. + ot(" ldr r6,[r7,#0x54]\n"); + ot(" ldrh r8,[r4],#2 ;@ Fetch next opcode\n"); + ot(" subs r5,r5,#50 ;@ Subtract cycles\n"); + ot(" ldrge pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); + ot(" b CycloneEnd\n"); + ot("\n"); +#endif + + // -------------- +#if EMULATE_TRACE + // expects srh and irq level in r1, next opcode already fetched to r8 + ot("CycloneDoTraceWithChecks%s\n", ms?"":":"); + ot(" ldr r0,[r7,#0x58]\n"); + ot(" cmp r5,#0\n"); + ot(" orr r0,r0,#2 ;@ go to trace mode\n"); + ot(" str r0,[r7,#0x58]\n"); + ot(" blt CycloneEnd\n"); // should take care of situation where we come here when already tracing + ot(";@ CheckInterrupt:\n"); + ot(" movs r0,r1,lsr #24 ;@ Get IRQ level\n"); + ot(" beq CycloneDoTrace\n"); + ot(" cmp r0,#6 ;@ irq>6 ?\n"); + ot(" andle r1,r1,#7 ;@ Get interrupt mask\n"); + ot(" cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n"); + ot(" bgt CycloneDoInterruptGoBack\n"); + ot("\n"); + + // expects next opcode to be already fetched to r8 + ot("CycloneDoTrace%s\n", ms?"":":"); + ot(" str r5,[r7,#0x9c] ;@ save cycles\n"); + ot(" ldr r1,[r7,#0x98]\n"); + ot(" mov r5,#0\n"); + ot(" str r1,[r7,#0xa0]\n"); + ot(" adr r0,TraceEnd\n"); + ot(" str r0,[r7,#0x98] ;@ store TraceEnd as CycloneEnd hadler\n"); + ot(" ldr pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); + ot("\n"); + + ot("TraceEnd%s\n", ms?"":":"); + ot(" ldr r2,[r7,#0x58]\n"); + ot(" ldr r0,[r7,#0x9c] ;@ restore cycles\n"); + ot(" ldr r1,[r7,#0xa0] ;@ old CycloneEnd handler\n"); + ot(" mov r10,r10,lsl #28\n"); + ot(" add r5,r0,r5\n"); + ot(" str r1,[r7,#0x98]\n"); + ot(";@ still tracing?\n"); // exception might have happend + ot(" tst r2,#2\n"); + ot(" beq TraceDisabled\n"); + ot(";@ trace exception\n"); +#if EMULATE_ADDRESS_ERRORS_JUMP || EMULATE_ADDRESS_ERRORS_IO + ot(" ldr r1,[r7,#0x58]\n"); + ot(" mov r0,#9\n"); + ot(" orr r1,r1,#4 ;@ set activity bit: 'not processing instruction'\n"); + ot(" str r1,[r7,#0x58]\n"); +#else + ot(" mov r0,#9\n"); +#endif + ot(" bl Exception\n"); + ot(" ldrh r8,[r4],#2 ;@ Fetch next opcode\n"); + ot(" subs r5,r5,#34 ;@ Subtract cycles\n"); + ot(" ldrge pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); + ot(" b CycloneEnd\n"); + ot("\n"); + ot("TraceDisabled%s\n", ms?"":":"); + ot(" ldrh r8,[r4],#2 ;@ Fetch next opcode\n"); + ot(" cmp r5,#0\n"); + ot(" ldrge pc,[r6,r8,asl #2] ;@ Jump to opcode handler\n"); + ot(" b CycloneEnd\n"); + ot("\n"); +#endif } // --------------------------------------------------------------------------- // Call Read(r0), Write(r0,r1) or Fetch(r0) -// Trashes r0-r3 -int MemHandler(int type,int size) +// Trashes r0-r3,r12,lr +int MemHandler(int type,int size,int addrreg,int need_addrerr_check) { - int func=0; - func=0x68+type*0xc+(size<<2); // Find correct offset + int func=0x68+type*0xc+(size<<2); // Find correct offset + char what[32]; - if (Debug&4) ot(" str r4,[r7,#0x40] ;@ Save PC\n"); - if (Debug&3) ot(" str r5,[r7,#0x5c] ;@ Save Cycles\n"); +#if MEMHANDLERS_NEED_FLAGS + ot(" mov r3,r10,lsr #28\n"); + ot(" strb r3,[r7,#0x46] ;@ Save Flags (NZCV)\n"); +#endif + FlushPC(); - ot(" mov lr,pc\n"); +#if (MEMHANDLERS_ADDR_MASK & 0xff000000) + ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0xff000000); + addrreg=0; +#endif +#if (MEMHANDLERS_ADDR_MASK & 0x00ff0000) + ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0x00ff0000); + addrreg=0; +#endif +#if (MEMHANDLERS_ADDR_MASK & 0x0000ff00) + ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0x0000ff00); + addrreg=0; +#endif +#if (MEMHANDLERS_ADDR_MASK & 0x000000ff) + ot(" bic r0,r%i,#0x%08x\n", addrreg, MEMHANDLERS_ADDR_MASK & 0x000000ff); + addrreg=0; +#endif + +#if EMULATE_ADDRESS_ERRORS_IO + if (size > 0 && need_addrerr_check) + { + ot(" add lr,pc,#4*%i\n", addrreg==0?2:3); // helps to prevent interlocks + if (addrreg != 0) ot(" mov r0,r%i\n", addrreg); + ot(" tst r0,#1 ;@ address error?\n"); + switch (type) { + case 0: ot(" bne ExceptionAddressError_r_data\n"); break; + case 1: ot(" bne ExceptionAddressError_w_data\n"); break; + case 2: ot(" bne ExceptionAddressError_r_prg\n"); break; + } + } + else +#endif + + sprintf(what, "%s%d", type==0 ? "read" : (type==1 ? "write" : "fetch"), 8<>12); fflush(stdout); } // Update progress - OpAny(op); + if (!is_op_hot(op)) + OpAny(op); } ot("\n"); @@ -201,41 +1101,146 @@ static void PrintOpcodes() printf("]\n"); } +// helper +static void ott(const char *str, int par, const char *nl, int nlp, int counter, int size) +{ + switch(size) { + case 0: if((counter&7)==0) ot(ms?" dcb ":" .byte "); break; + case 1: if((counter&7)==0) ot(ms?" dcw ":" .hword "); break; + case 2: if((counter&7)==0) ot(ms?" dcd ":" .long "); break; + } + ot(str, par); + if((counter&7)==7) ot(nl,nlp); else ot(","); +} + static void PrintJumpTable() { int i=0,op=0,len=0; ot(";@ -------------------------- Jump Table --------------------------\n"); - ot("JumpTab%s\n", ms?"":":"); - len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table - for (i=0;i=0; u--) if(op == CyJump[u]) break; // already done with this op? + if(u==-1 && op >= 0) { + ott("Op%.4x",op," ;@ %.4x\n",i,handlers,2); + indexes[op] = handlers; + handlers++; + } + } + if(handlers&7) { + fseek(AsmFile, -1, SEEK_CUR); // remove last comma + for(i = 8-(handlers&7); i > 0; i--) + ot(",000000"); + ot("\n"); + } + if(ms) { + for(i = (0x4000-handlers)/8; i > 0; i--) + ot(" dcd 0,0,0,0,0,0,0,0\n"); + } else { + ot(ms?"":" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x4000-handlers)/8); + } + printf("total distinct hanlers: %i\n",handlers); + // output data + for(i=0,ip=0; i < 0xf000; i++, ip++) { + op=CyJump[i]; + if(op == -2) { + // it must skip a-line area, because we keep our data there + ott("0x%.4x", handlers<<4, "\n",0,ip++,1); + ott("0x%.4x", 0x1000, "\n",0,ip,1); + i+=0xfff; + continue; + } + for(reps=1; i < 0xf000; i++, reps++) if(op != CyJump[i+1]) break; + if(op>=0) out=indexes[op]<<4; else out=0; // unrecognised + if(reps <= 0xe || reps==0x10) { + if(reps!=0x10) out|=reps; else out|=0xf; // 0xf means 0x10 (0xf appeared to be unused anyway) + ott("0x%.4x", out, "\n",0,ip,1); + } else { + ott("0x%.4x", out, "\n",0,ip++,1); + ott("0x%.4x", reps,"\n",0,ip,1); + } + } + if(ip&1) ott("0x%.4x", 0, "\n",0,ip++,1); + if(ip&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma + if(ip&7) { + for(i = 8-(ip&7); i > 0; i--) + ot(",0x0000"); + } + ot("\n"); + if(ms) { + for(i = (0x2000-ip/2)/8+1; i > 0; i--) + ot(" dcd 0,0,0,0,0,0,0,0\n"); + } else { + ot(" .rept 0x%x\n .long 0,0,0,0,0,0,0,0\n .endr\n", (0x2000-ip/2)/8+1); + } + ot("\n"); + free(indexes); +#else + ot("CycloneJumpTab%s\n", ms?"":":"); + len=0xfffe; // Hmmm, armasm 2.50.8684 messes up with a 0x10000 long jump table + // notaz: same thing with GNU as 2.9-psion-98r2 (reloc overflow) + // this is due to COFF objects using only 2 bytes for reloc count + + for (i=0;i=0) ott("Op%.4x",op," ;@ %.4x\n",i-7,i,2); + else if(op==-2) ott("Op__al",0, " ;@ %.4x\n",i-7,i,2); + else if(op==-3) ott("Op__fl",0, " ;@ %.4x\n",i-7,i,2); + else ott("Op____",0, " ;@ %.4x\n",i-7,i,2); + } + if(i&7) fseek(AsmFile, -1, SEEK_CUR); // remove last comma + + ot("\n"); + ot(";@ notaz: we don't want to crash if we run into those 2 missing opcodes\n"); + ot(";@ so we leave this pattern to patch it later\n"); + ot("%s 0x78563412\n", ms?" dcd":" .long"); + ot("%s 0x56341290\n", ms?" dcd":" .long"); +#endif } static int CycloneMake() { - char *name="Cyclone.s"; - + int i; + const char *name="Cyclone.s"; + const char *globl=ms?"export":".global"; + // Open the assembly file if (ms) name="Cyclone.asm"; AsmFile=fopen(name,"wt"); if (AsmFile==NULL) return 1; - + printf("Making %s...\n",name); ot("\n;@ Cyclone 68000 Emulator v%x.%.3x - Assembler Output\n\n",CycloneVer>>12,CycloneVer&0xfff); - ot(";@ Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\n\n"); + ot(";@ Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com)\n"); + ot(";@ Copyright (c) 2005-2011 Gražvydas \"notaz\" Ignotas (notasas (at) gmail.com)\n\n"); ot(";@ This code is licensed under the GNU General Public License version 2.0 and the MAME License.\n"); ot(";@ You can choose the license that has the most advantages for you.\n\n"); @@ -243,36 +1248,53 @@ static int CycloneMake() CyJump=(int *)malloc(0x40000); if (CyJump==NULL) return 1; memset(CyJump,0xff,0x40000); // Init to -1 + for(i=0xa000; i<0xb000; i++) CyJump[i] = -2; // a-line emulation + for(i=0xf000; i<0x10000; i++) CyJump[i] = -3; // f-line emulation - if (ms) - { - ot(" area |.text|, code\n"); - ot(" export CycloneRun\n"); - ot(" export CycloneVer\n"); - ot("\n"); - ot("CycloneVer dcd 0x%.4x\n",CycloneVer); - } - else - { - ot(" .global CycloneRun\n"); - ot(" .global CycloneVer\n"); - ot("CycloneVer: .long 0x%.4x\n",CycloneVer); - } + ot(ms?" area |.text|, code\n":" .text\n .align 4\n\n"); + ot(" %s CycloneInit\n",globl); + ot(" %s CycloneReset\n",globl); + ot(" %s CycloneRun\n",globl); + ot(" %s CycloneSetSr\n",globl); + ot(" %s CycloneGetSr\n",globl); + ot(" %s CycloneFlushIrq\n",globl); + ot(" %s CyclonePack\n",globl); + ot(" %s CycloneUnpack\n",globl); + ot(" %s CycloneVer\n",globl); +#if (CYCLONE_FOR_GENESIS == 2) + ot(" %s CycloneSetRealTAS\n",globl); + ot(" %s CycloneDoInterrupt\n",globl); + ot(" %s CycloneDoTrace\n",globl); + ot(" %s CycloneJumpTab\n",globl); + ot(" %s Op____\n",globl); + ot(" %s Op6001\n",globl); + ot(" %s Op6601\n",globl); + ot(" %s Op6701\n",globl); +#endif + ot("\n"); + ot(ms?"CycloneVer dcd 0x":"CycloneVer: .long 0x"); + ot("%.4x\n",CycloneVer); ot("\n"); PrintFramework(); + arm_op_count = 0; PrintOpcodes(); + printf("~%i ARM instructions used for opcode handlers\n", arm_op_count); PrintJumpTable(); if (ms) ot(" END\n"); + ot("\n\n;@ vim:filetype=armasm\n"); + fclose(AsmFile); AsmFile=NULL; +#if 0 printf("Assembling...\n"); // Assemble the file if (ms) system("armasm Cyclone.asm"); else system("as -o Cyclone.o Cyclone.s"); printf("Done!\n\n"); +#endif free(CyJump); return 0; @@ -282,7 +1304,8 @@ int main() { printf("\n Cyclone 68000 Emulator v%x.%.3x - Core Creator\n\n",CycloneVer>>12,CycloneVer&0xfff); - // Make GAS and ARMASM versions - for (ms=0;ms<2;ms++) CycloneMake(); + // Make GAS or ARMASM version + CycloneMake(); return 0; } +