X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=cpu%2FCyclone%2FMain.cpp;h=a85aebcef924414327e2219d338b3c877c6304e7;hb=d5d119243c9e1086e1e6cb34ea05bfd6ab18c200;hp=2f92c5cfd67672e084b9980fc6960730881cceb8;hpb=cc68a136aa179a5f32fe40208371eb9c2b0aadae;p=picodrive.git

diff --git a/cpu/Cyclone/Main.cpp b/cpu/Cyclone/Main.cpp
index 2f92c5c..a85aebc 100644
--- a/cpu/Cyclone/Main.cpp
+++ b/cpu/Cyclone/Main.cpp
@@ -32,6 +32,51 @@ void ltorg()
   else    ot("  .ltorg\n");
 }
 
+#if CYCLONE_FOR_GENESIS
+// r12=ptr to tas in table, trashes r0,r1
+static void ChangeTAS(int norm)
+{
+  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 all temp regs
 static void PrintException(int ints)
 {
@@ -86,14 +131,13 @@ static void PrintException(int ints)
 void CheckInterrupt(int op)
 {
   ot(";@ CheckInterrupt:\n");
-  ot("  ldr r0,[r7,#0x44]\n"); // same as  ldrb r0,[r7,#0x47]
-  ot("  movs r0,r0,lsr #24 ;@ Get IRQ level (loading word is faster)\n");
+  ot("  ldr r1,[r7,#0x44] ;@ Get SR high T_S__III and irq level\n");
+  ot("  movs r0,r1,lsr #24 ;@ Get IRQ level\n"); // same as  ldrb r0,[r7,#0x47]
   ot("  beq NoInts%x\n",op);
   ot("  cmp r0,#6 ;@ irq>6 ?\n");
-  ot("  ldrleb r1,[r7,#0x44] ;@ Get SR high: T_S__III\n");
   ot("  andle r1,r1,#7 ;@ Get interrupt mask\n");
   ot("  cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");
-  ot("  blgt DoInterrupt\n");
+  ot("  blgt CycloneDoInterrupt\n");
   ot("NoInts%x%s\n", op,ms?"":":");
   ot("\n");
 }
@@ -109,22 +153,21 @@ static void PrintFramework()
   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("  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("  ldr r0,[r7,#0x44]\n");
+  ot("  ldr r1,[r7,#0x44]  ;@ Get SR high T_S__III and irq level\n");
   ot("  mov r9,r9,lsl #28  ;@ r9 = Flags 0xf0000000, cpsr format\n");
   ot("                     ;@ r10 = Source value / Memory Base\n");
   ot("\n");
   ot(";@ CheckInterrupt:\n");
-  ot("  movs r0,r0,lsr #24 ;@ Get IRQ level\n"); // same as  ldrb r0,[r7,#0x47]
+  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("  ldrleb r1,[r7,#0x44] ;@ Get SR high: T_S__III\n");
   ot("  andle r1,r1,#7 ;@ Get interrupt mask\n");
   ot("  cmple r0,r1 ;@ irq<=6: Is irq<=mask ?\n");
-  ot("  blgt DoInterrupt\n");
+  ot("  blgt CycloneDoInterrupt\n");
   ot(";@ Check if interrupt used up all the cycles:\n");
   ot("  subs r5,r5,#0\n");
   ot("  blt CycloneEndNoBack\n");
@@ -143,7 +186,14 @@ static void PrintFramework()
   ot("CycloneEnd%s\n", ms?"":":");
   ot("  sub r4,r4,#2\n");
   ot("CycloneEndNoBack%s\n", ms?"":":");
+#ifdef CYCLONE_FOR_PICODRIVE
+  ot("  ldr r1,[r7,#0x54]\n");
+  ot("  mov r9,r9,lsr #28\n");
+  ot("  tst r1,r1\n");
+  ot("  bxne r1            ;@ jump to alternative CycloneEnd\n");
+#else
   ot("  mov r9,r9,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");
@@ -161,7 +211,7 @@ static void PrintFramework()
     ot(";@ uncompress jump table\n");
     if (ms) ot("CycloneInit\n");
     else    ot("CycloneInit:\n");
-    ot("  ldr r12,=JumpTab\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");
@@ -187,7 +237,7 @@ static void PrintFramework()
     ot("  bgt unc_loop_in\n");
     ot("  b unc_loop\n");
     ot("unc_finish%s\n", ms?"":":");
-    ot("  ldr r12,=JumpTab\n");
+    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");
@@ -254,8 +304,28 @@ static void PrintFramework()
   ot("  bx lr\n");
   ot("\n");
 
+  if (ms) ot("CycloneSetRealTAS\n");
+  else    ot("CycloneSetRealTAS:\n");
+#if CYCLONE_FOR_GENESIS
+  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();
+  ot("\n");
+#else
+  ot("  bx lr\n");
+  ot("\n");
+#endif
+
   ot(";@ DoInterrupt - r0=IRQ number\n");
-  ot("DoInterrupt%s\n", ms?"":":");
+  ot("CycloneDoInterrupt%s\n", ms?"":":");
   ot("  stmdb sp!,{lr} ;@ Push ARM return address\n");
 
   ot(";@ Get IRQ Vector address:\n");
@@ -465,6 +535,9 @@ static void PrintJumpTable()
 
   ot(";@ -------------------------- Jump Table --------------------------\n");
 
+  // space for decompressed table
+  ot(ms?"  area |.data|, data\n":"  .data\n  .align 4\n\n");
+
 #if COMPRESS_JUMPTABLE
     int handlers=0,reps=0,*indexes,ip,u,out;
     // use some weird compression on the jump table
@@ -472,10 +545,7 @@ static void PrintJumpTable()
 	if(!indexes) { printf("ERROR: out of memory\n"); exit(1); }
 	len=0x10000;
 
-	// space for decompressed table
-	ot(ms?"  area |.data|, data\n":"  .data\n  .align 4\n\n");
-
-	ot("JumpTab%s\n", ms?"":":");
+	ot("CycloneJumpTab%s\n", ms?"":":");
 	if(ms) {
 	  for(i = 0; i < 0xa000/8; i++)
 	    ot("  dcd 0,0,0,0,0,0,0,0\n");
@@ -548,7 +618,7 @@ static void PrintJumpTable()
 	ot("\n");
 	free(indexes);
 #else
-	ot("JumpTab%s\n", ms?"":":");
+	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
@@ -602,6 +672,7 @@ static int CycloneMake()
     ot("  export CycloneRun\n");
     ot("  export CycloneSetSr\n");
     ot("  export CycloneGetSr\n");
+    ot("  export CycloneSetRealTAS\n");
     ot("  export CycloneVer\n");
     ot("\n");
     ot("CycloneVer dcd 0x%.4x\n",CycloneVer);
@@ -612,7 +683,12 @@ static int CycloneMake()
     ot("  .global CycloneRun\n");
     ot("  .global CycloneSetSr\n");
     ot("  .global CycloneGetSr\n");
+    ot("  .global CycloneSetRealTAS\n");
     ot("  .global CycloneVer\n");
+#ifdef CYCLONE_FOR_PICODRIVE
+    ot("  .global CycloneDoInterrupt\n");
+    ot("  .global CycloneJumpTab\n");
+#endif
     ot("CycloneVer: .long 0x%.4x\n",CycloneVer);
   }
   ot("\n");
@@ -623,6 +699,8 @@ static int CycloneMake()
 
   if (ms) ot("  END\n");
 
+  ot("\n\n;@ vim:filetype=armasm\n");
+
   fclose(AsmFile); AsmFile=NULL;
 
 #if 0