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-rw-r--r--src/codehandler.cpp439
1 files changed, 439 insertions, 0 deletions
diff --git a/src/codehandler.cpp b/src/codehandler.cpp
new file mode 100644
index 0000000..b1d67d2
--- /dev/null
+++ b/src/codehandler.cpp
@@ -0,0 +1,439 @@
+#include <common.h>
+
+u8 frozen_value = 0;
+u32 regbuffer[72] = {0};
+u32 dwordbuffer[2] = {0};
+u32 bpbuffer[4] = {0};
+u8 cmd;
+
+/*FIXME
+ * u32 register_to_match = 0;
+ * u32 register_value = 0;
+ * u32 bplist[40] = {0};
+ */
+
+#define PACKET_SIZE 0xF800
+
+extern "C" void writebranch(u32 source, u32 destination);
+extern "C" void bphandler();
+
+// return true if remainder
+bool _packetdivide(u32 memrange, u32 size, u32* full, u32* remainder) {
+ *full = memrange / size;
+ *remainder = memrange % size;
+ return (*remainder) ? true : false;
+}
+
+u32 checkexisend(u32 EXI_command) {
+ //OSReport("checkexisend(0x%08x);\n", EXI_command);
+ *(u32*)0xCD006814 = 0xD0;
+ *(u32*)0xCD006824 = EXI_command;
+ *(u32*)0xCD006820 = 0x19;
+
+ u32 exi_chan1cr = 1;
+ while((exi_chan1cr)&1) {
+ exi_chan1cr = *(u32*)0xCD006820;
+ exi_chan1cr &= 1;
+ }
+
+ *(u32*)0xCD006814 = exi_chan1cr;
+ return *(u32*)0xCD006824;
+}
+
+struct exidata {
+ unsigned bits0to3 : 4;
+ unsigned bit4 : 1;
+ unsigned bit5 : 1;
+ unsigned bit6 : 1;
+ unsigned bit7 : 1;
+ unsigned data : 8;
+ unsigned bottom : 16;
+};
+
+bool exichecktx() {
+ *(u32*)0xCD006814 = 0xD0;
+ *(u32*)0xCD006824 = 0xC0000000;
+ *(u32*)0xCD006820 = 0x09;
+
+ u32 exi_chan1cr = 1;
+ while((exi_chan1cr)&1) {
+ exi_chan1cr = *(u32*)0xCD006820;
+ exi_chan1cr &= 1;
+ }
+
+ *(u32*)0xCD006814 = exi_chan1cr;
+ u32 ret = *(u32*)0xCD006824;
+ struct exidata* dat = (exidata*)&ret;
+ return (dat->bit5) ? true : false;
+}
+
+bool exireceivebyte(u8* byte) {
+ //OSReport("exireceivebyte()\n");
+ u32 ret = checkexisend(0xA0000000);
+ struct exidata * dat = (exidata*)&ret;
+ *byte = dat->data;
+ return (dat->bit4) ? true : false;
+}
+
+bool exicheckreceive() {
+ bool ret = false;
+ while(!ret) {
+ u32 foo = checkexisend(0xD0000000);
+ struct exidata* dat = (exidata*)&foo;
+ ret = dat->bit5;
+ }
+ return ret;
+}
+
+void exireceivebuffer(u32 counter, u8* buffer) {
+ for(u32 ii=0; ii<counter; ii++) {
+ u8 byte;
+ bool ret = false;
+ while(!ret) {
+ exicheckreceive();
+ exicheckreceive();
+ ret = exireceivebyte(&byte);
+ }
+ buffer[ii] = byte;
+ }
+}
+
+bool exisendbyte(u8 byte) {
+ u32 sendbyte = byte << 20;
+ sendbyte |= 0xB0000000;
+
+ u32 ret = checkexisend(sendbyte);
+ struct exidata* dat = (exidata*)&ret;
+ return (dat->bit5) ? true : false;
+}
+
+void exisendbuffer(u32 counter, u8* buffer) {
+ bool ret = false;
+ for(u32 ii=0; ii<counter; ii++) {
+ while(!ret) {
+ ret = exichecktx();
+ }
+ ret = false;
+ while(!ret) {
+ ret = exisendbyte( buffer[ii] );
+ }
+ //OSReport("Sent byte from buffer\n");
+ }
+}
+
+void versionnumber() {
+ // send 0x80 for wii
+ exisendbyte(0x80);
+}
+
+void pausestatus() {
+ exisendbyte(frozen_value);
+}
+
+void freezegame() {
+ frozen_value = 1;
+ //OSReport("frozen_value: %d\n", frozen_value);
+}
+
+void unfreezegame() {
+ frozen_value = 0;
+ //OSReport("frozen_value: %d\n", frozen_value);
+}
+
+u8 get_frozenvalue() {
+ return frozen_value;
+}
+
+void writedword() {
+ exireceivebuffer(8, (u8*)dwordbuffer);
+
+ u32 location = dwordbuffer[0];
+ u32 value = dwordbuffer[1];
+ *(u32*)location = value;
+
+ asm("dcbf 0, %0; sync; icbi 0, %0; isync" : : "b"(location));
+}
+
+void writeword() {
+ exireceivebuffer(8, (u8*)dwordbuffer);
+
+ u32 location = dwordbuffer[0];
+ u32 value = dwordbuffer[1];
+ *(u16*)location = (u16)value;
+
+ asm("dcbf 0, %0; sync; icbi 0, %0; isync" : : "b"(location));
+}
+
+void writebyte() {
+ exireceivebuffer(8, (u8*)dwordbuffer);
+
+ u32 location = dwordbuffer[0];
+ u32 value = dwordbuffer[1];
+ *(u8*)location = (u8)value;
+
+ asm("dcbf 0, %0; sync; icbi 0, %0; isync" : : "b"(location));
+}
+
+//FIXME removed upload
+/*
+void upbpdata() {
+ exisendbyte(0xAA);
+ upload(regbuffer, 40*4);
+}
+*/
+
+void getbpdata() {
+ exisendbuffer(72*4, (u8*)regbuffer);
+}
+
+//returns false if we need to go to resume and not finish
+bool breakpoints(u8 type) {
+ //FIXME
+ u32 _bphandler = (u32)bphandler;
+ writebranch(0x80000300, _bphandler);
+ writebranch(0x80000D00, _bphandler);
+ writebranch(0x80001300, _bphandler);
+
+ bpbuffer[0] = 0; //clears inst bp
+ bpbuffer[1] = 0; //clears data bp
+ bpbuffer[2] = 0; //clears alignment
+
+ u32 SRR1 = regbuffer[6]; // SRR1
+
+ if(frozen_value != 2) { // not on breakpoint
+ bpbuffer[3] = 0; // clear broken on address
+ }else if(type == 0x44) { // step
+ bpbuffer[3] = frozen_value; // set broken on address to frozen_value
+ if(frozen_value == 2) {
+ regbuffer[6] = SRR1 | 0x400;
+ unfreezegame();
+ //FIXME need to go to resume and not finish
+ return false;
+ }
+ }
+
+ //cmpwi cr6,r29,0x10 # 0x10=instruction, 0x09/0x89=data
+ //cmpwi cr5,r29,0x44 # 0x44=step
+
+ regbuffer[6] = SRR1 & 0xffffbfff;
+ if(type != 0x44) {
+ u32 value1, value2;
+ exireceivebuffer(4, (u8*)&value1);
+ if(type == 0x10) {
+ bpbuffer[0] = value1; // instbp = value1;
+ }else{
+ bpbuffer[1] = value1; // databp = value1;
+ }
+
+ if(type == 0x89) {
+ exireceivebuffer(4, (u8*)&value2);
+ bpbuffer[2] = value2;
+ }
+
+ u32 IABR = bpbuffer[0]; // IABR = instbp
+ u32 DABR = bpbuffer[1]; // DABR = databp
+ asm("mtspr 1010, %0; mtspr 1013, %1" : : "b"(IABR), "b"(DABR));
+ }
+ return true;
+}
+
+void cancelbreakpoints() {
+ u32 x = 0;
+ asm("mtspr 1013, %0; mtspr 1010, %0" : "=r"(x) : );
+
+ // clears bit 21 of SRR1
+ regbuffer[6] = regbuffer[6] & 0xfffffbff;
+}
+
+void readmem() {
+ exisendbyte(0xAA);
+
+ exireceivebuffer(8, (u8*)dwordbuffer);
+
+ u32 start_location = dwordbuffer[0];
+ u32 end_location = dwordbuffer[1];
+ u32 memrange = end_location - start_location;
+
+ u32 full, remainder;
+ bool ret = _packetdivide(memrange, PACKET_SIZE, &full, &remainder);
+
+ u32 location = start_location;
+ while(full) {
+ exisendbuffer(PACKET_SIZE, (u8*)location);
+
+ bool ret2 = false;
+ bool ret3 = false;
+ u8 byte;
+ while(!ret3) {
+ while(!ret2) {
+ exicheckreceive();
+ exicheckreceive();
+ ret2 = exireceivebyte(&byte);
+ }
+
+ if(byte == 0xCC) {
+ goto done_readmem;
+ }else if(byte == 0xBB) {
+ ret3 = true;
+ }else if(byte == 0xAA) {
+ location += PACKET_SIZE;
+ full--;
+ ret3 = true;
+ }
+ }
+ }
+ while(remainder) {
+ exisendbuffer(remainder, (u8*)location);
+
+ //OSReport("Buffer sent\n");
+ bool ret2 = false;
+ bool ret3 = false;
+ u8 byte;
+ while(!ret3) {
+ while(!ret2) {
+ exicheckreceive();
+ exicheckreceive();
+ ret2 = exireceivebyte(&byte);
+ }
+
+ if(byte == 0xCC) {
+ goto done_readmem;
+ }else if(byte == 0xBB) {
+ ret3 = true;
+ }else if(byte == 0xAA) {
+ location += remainder;
+ remainder = 0;
+ ret3 = true;
+ }
+ }
+ }
+done_readmem:
+ asm("nop");
+}
+
+bool command_handler() {
+ cmd = 0;
+ bool ret = exireceivebyte(&cmd);
+ if(!ret)
+ return true;
+
+ switch(cmd) {
+ case 0x1:
+ writebyte();
+ break;
+ case 0x2:
+ writeword();
+ break;
+ case 0x3:
+ writedword();
+ break;
+ case 0x4:
+ readmem();
+ break;
+ case 0x6:
+ freezegame();
+ break;
+ case 0x7:
+ unfreezegame();
+ break;
+ case 0x8: // resume
+ return false;
+ break;
+ case 0x9:
+ return breakpoints(cmd);
+ break;
+ case 0x10:
+ return breakpoints(cmd);
+ break;
+ case 0x2F: // NOT IMPLEMENTED
+ break;
+ case 0x30:
+ getbpdata();
+ break;
+ case 0x38:
+ cancelbreakpoints();
+ break;
+ case 0x40: // NOT IMPLEMENTED
+ break;
+ case 0x41: // NOT IMPLEMENTED
+ break;
+ case 0x44:
+ return breakpoints(cmd);
+ break;
+ case 0x50:
+ pausestatus();
+ break;
+ case 0x60: // NOT IMPLEMENTED
+ break;
+ case 0x89:
+ return breakpoints(cmd);
+ break;
+ case 0x99:
+ versionnumber();
+ break;
+ default:
+ break;
+ };
+ return true;
+}
+
+//FIXME
+bool handle_bps() {
+ return false;
+}
+
+#if 0 // DEFAULT IABR BPHANDLER
+ bpregs[0x0C] = r3
+ bpregs[0x10] = r4
+ bpregs[0x14] = r5
+ bpregs[0x80] = CR
+ bpregs[0x84] = LR
+ bpregs[0x88] = CTR
+ bpregs[0x8C] = XER
+ bpregs[0x198] = SRR0
+ bpregs[0x19C] = SRR1
+ 80000300 7C9043A6 mtsprg 0,r4
+ 80000304 808000C0 lwz r4,0xC0(r0)
+ 80000308 9064000C stw r3,0xC(r4)
+ 8000030c 7C7042A6 mfsprg r3,0
+ 80000310 90640010 stw r3,0x10(r4)
+ 80000314 90A40014 stw r5,0x14(r4)
+ 80000318 A06401A2 lhz r3,0x1A2(r4)
+ 8000031c 60630002 ori r3,r3,2
+ 80000320 B06401A2 sth r3,0x1A2(r4)
+ 80000324 7C600026 mfcr r3
+ 80000328 90640080 stw r3,0x80(r4)
+ 8000032c 7C6802A6 mflr r3
+ 80000330 90640084 stw r3,0x84(r4)
+ 80000334 7C6902A6 mfctr r3
+ 80000338 90640088 stw r3,0x88(r4)
+ 8000033c 7C6102A6 mfxer r3
+ 80000340 9064008C stw r3,0x8C(r4)
+ 80000344 7C7A02A6 mfsrr0 r3
+ 80000348 90640198 stw r3,0x198(r4)
+ 8000034c 7C7B02A6 mfsrr1 r3
+ 80000350 9064019C stw r3,0x19C(r4)
+ 80000354 7C651B78 mr r5,r3
+ 80000358 60000000 nop
+ 8000035c 7C6000A6 mfmsr r3
+ 80000360 60630030 ori r3,r3,0x30
+ 80000364 7C7B03A6 mtsrr1 r3
+ 80000368 38600002 li r3,2
+ 8000036c 808000D4 lwz r4,0xD4(r0)
+ 80000370 54A507BD rlwinm. r5,r5,0,30,30
+ 80000374 40820014 bne- 0x80000388
+ 80000378 3CA0801B lis r5,0x801B
+ 8000037c 38A5B0F0 subi r5,r5,20240 #0x801AB0F0
+ 80000380 7CBA03A6 mtsrr0 r5
+ 80000384 4C000064 rfi
+ 80000388 546515BA rlwinm r5,r3,2,22,29
+ 8000038c 80A53000 lwz r5,0x3000(r5)
+ 80000390 7CBA03A6 mtsrr0 r5
+ 80000394 4C000064 rfi
+ 80000398 60A5E040 ori r5,r5,0xE040
+ 8000039c 54A500BE rlwinm r5,r5,0,2,31
+ 800003a0 546315BA rlwinm r3,r3,2,22,29
+ 800003a4 7CA3282E lwzx r5,r3,r5
+ 800003a8 7CBA03A6 mtsrr0 r5
+ 800003ac 4C000064 rfi
+#endif
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