Commit QuarkTheAwesome's data breakpoints attempt (slightly modified)

src/system/exception_handler.cpp

@@ -125,11 +125,11 @@ static unsigned char exceptionCallback(void *c, unsigned char exception_type) {
 	return 1;
 }
 
-static unsigned char dsi_exception_cb(void *context) {
+unsigned char dsi_exception_cb(void *context) {
 	return exceptionCallback(context, 0);
 }
 
-static unsigned char isi_exception_cb(void *context) {
+unsigned char isi_exception_cb(void *context) {
 	return exceptionCallback(context, 1);
 }
 

src/system/exception_handler.h

@@ -78,6 +78,10 @@ typedef struct _framerec {
 
 void setup_os_exceptions(void);
 
+unsigned char dsi_exception_cb(void *context);
+unsigned char isi_exception_cb(void *context);
+unsigned char program_exception_cb(void *context);
+
 #ifdef __cplusplus
 }
 #endif

src/tcpgecko/hardware_breakpoints.S

@@ -0,0 +1,17 @@
+#include "../utils/ppc_asm.h"
+
+.set dabr, 0x3F5
+
+# .section text
+
+.global KernelSetDABR
+KernelSetDABR:
+    mtspr dabr, r3
+    blr
+
+.global SC0x2D_KernelSetDABR
+SC0x2D_KernelSetDABR:
+    li r0, 0x2D00
+    sc
+    nop
+    blr

src/tcpgecko/hardware_breakpoints.h

@@ -1,13 +1,105 @@
-#include "stringify.h"
+#include <stdbool.h>
 #include "../dynamic_libs/os_functions.h"
-#include "threads.h"
+#include "../system/exception_handler.h"
+#include "../kernel/syscalls.h"
+#include "../common/common.h"
 #include "../utils/logger.h"
-#include "main.h"
-#include "utilities.h"
 #include "software_breakpoints.h"
 
-#ifndef TCPGECKO_BREAKPOINTS_H
-#define TCPGECKO_BREAKPOINTS_H
+#ifndef TCPGECKO_HARDWARE_BREAKPOINTS_H
+#define TCPGECKO_HARDWARE_BREAKPOINTS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*	Fix a gap in exception_handler.h
+    Yes, this is the dsisr.
+*/
+#define dsisr exception_specific0
+#define DSISR_DABR_MATCH 0x400000
+
+extern /* kernelmode */ void KernelSetDABR(unsigned int dabr);
+
+extern void SC0x2D_KernelSetDABR(unsigned int dabr);
+
+static void RegisterDataBreakpointHandler(unsigned char (*breakpointHandler)(OSContext *ctx));
+
+static void DataBreakpoints_Install();
+
+static unsigned char DataBreakpoints_DSIHandler(void *ctx);
+
+static unsigned char (*bHandler)(OSContext *ctx);
+
+static void RegisterDataBreakpointHandler(unsigned char (*breakpointHandler)(OSContext *ctx)) {
+	bHandler = breakpointHandler;
+}
+
+static inline int getDABRAddress(void *interruptedContext) {
+	OSContext *context = (OSContext *) interruptedContext;
+	return (int) context->srr0; // Offset 0xA4
+}
+
+unsigned char basicDABRBreakpointHandler(OSContext *context) {
+	log_print("Getting DABR address\n");
+	int address = getDABRAddress(context);
+	log_printf("Got DABR address: %08x\n", address);
+
+	if (OSIsAddressValid((const void *) address)) {
+		log_printf("Data breakpoint address: %x08\n", address);
+	} else {
+		log_printf("Data breakpoint invalid address: %x08\n", address);
+	}
+
+	return 0;
+}
+
+static void SetDataBreakpoint(unsigned int address, bool read, bool write) {
+	log_print("Before installing...\n");
+	DataBreakpoints_Install();
+	log_print("After installing...\n");
+	RegisterDataBreakpointHandler(basicDABRBreakpointHandler);
+	log_print("After registering...\n");
+
+	unsigned int dabr = address & ~0b00000111; //GCC \o/
+	log_printf("DABR 1: %08x\n", dabr);
+	dabr |= 0b00000100; //enable translation
+	log_printf("DABR 2: %08x\n", dabr);
+	if (read) {
+		dabr |= 0b00000001; //break on read
+		log_printf("DABR 3: %08x\n", dabr);
+	}
+	if (write) {
+		dabr |= 0b00000010; //break on write
+		log_printf("DABR 4: %08x\n", dabr);
+	}
+
+	log_print("Setting DABR...\n");
+	SC0x2D_KernelSetDABR(dabr);
+	log_print("DABR set!\n");
+}
+
+static unsigned char DataBreakpoints_DSIHandler(void *ctx) {
+	log_print("DSI handler\n");
+	OSContext *context = (OSContext *) ctx;
+	if (context->dsisr & DSISR_DABR_MATCH) {
+		log_print("Running BP handler\n");
+		return bHandler(context);
+	}
+
+	log_print("DSI exception\n");
+	return dsi_exception_cb(ctx);
+}
+
+static void DataBreakpoints_Install() {
+	kern_write((void *) (OS_SPECIFICS->addr_KernSyscallTbl1 + (0x2D * 4)), (unsigned int) &KernelSetDABR);
+	kern_write((void *) (OS_SPECIFICS->addr_KernSyscallTbl2 + (0x2D * 4)), (unsigned int) &KernelSetDABR);
+	kern_write((void *) (OS_SPECIFICS->addr_KernSyscallTbl3 + (0x2D * 4)), (unsigned int) &KernelSetDABR);
+	kern_write((void *) (OS_SPECIFICS->addr_KernSyscallTbl4 + (0x2D * 4)), (unsigned int) &KernelSetDABR);
+	kern_write((void *) (OS_SPECIFICS->addr_KernSyscallTbl5 + (0x2D * 4)), (unsigned int) &KernelSetDABR);
+
+	OSSetExceptionCallback((u8) OS_EXCEPTION_DSI, &DataBreakpoints_DSIHandler);
+}
 
 // Special purpose registers
 #define IABR 0x3F2
@@ -44,11 +136,6 @@ static inline int getIABRAddress() {
 	return mfspr(IABR);
 }
 
-static inline int getDABRAddress(void *interruptedContext) {
-	OSContext *context = (OSContext *) interruptedContext;
-	return (int) context->srr0; // Offset 0xA4
-}
-
 static inline int getIABRMatch(void *interruptedContext) {
 	OSContext *context = (OSContext *) interruptedContext;
 	return (int) context->exception_specific1; // Offset 0x98
@@ -145,4 +232,8 @@ unsigned char breakPointHandler(void *interruptedContext) {
 	return 0;
 }
 
-#endif
+#ifdef __cplusplus
+} //extern "C"
+#endif
+
+#endif //TCPGECKO_HARDWARE_BREAKPOINTS_H

src/tcpgecko/tcp_gecko.cpp

@@ -14,7 +14,7 @@
 #include "../dynamic_libs/gx2_functions.h"
 #include "../dynamic_libs/fs_functions.h"
 #include "../utils/logger.h"
-#include "hardware_breakpoints.hpp"
+#include "hardware_breakpoints.h"
 #include "linked_list.h"
 #include "address.h"
 #include "stack.h"
@@ -23,6 +23,8 @@
 #include "../patcher/function_patcher_gx2.h"
 #include "raw_assembly_cheats.h"
 #include "sd_cheats.h"
+#include "threads.h"
+#include "software_breakpoints.h"
 
 void *client;
 void *commandBlock;
@@ -199,6 +201,12 @@ unsigned int receiveString(struct pygecko_bss_t *bss,
 	OSScreenFlipBuffersEx(1);
 }*/
 
+
+/* TODO
+ 		https://github.com/dimok789/ddd/blob/ca33ad1c759a0b67db33eedcf7fc4537198aad9c/src/discdumper.c#L667-L693
+		int ret = FSBindMount(pClient, pCmd, metaDir, "/vol/meta", -1);
+		FSBindUnmount(pClient, pCmd, metaDir, -1);
+	*/
 void considerInitializingFileSystem() {
 	if (!client) {
 		// Initialize the file system
@@ -1324,7 +1332,8 @@ static int processCommands(struct pygecko_bss_t *bss, int clientfd) {
 				bufferIndex += sizeof(bool);
 				bool write = buffer[bufferIndex];
 				bufferIndex += sizeof(bool);
-				setDataBreakpoint(address, read, write);
+				SetDataBreakpoint(address, read, write);
+				// setDataBreakpoint(address, read, write);
 
 				break;
 			}
@@ -1570,4 +1579,4 @@ void startTCPGecko() {
 	OSResumeThread(thread);
 
 	log_print("TCP Gecko started...\n");
-}
+}

src/utils/ppc_asm.h

@@ -0,0 +1,62 @@
+#ifndef PPC_ASM_H
+#define PPC_ASM_H
+/*
+ *
+ * Definitions used by various bits of low-level assembly code on PowerPC.
+ *
+ * Copyright (C) 1995-1999 Gary Thomas, Paul Mackerras, Cort Dougan.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ */
+
+/* Condition Register Bit Fields */
+
+#define	cr0	0
+#define	cr1	1
+#define	cr2	2
+#define	cr3	3
+#define	cr4	4
+#define	cr5	5
+#define	cr6	6
+#define	cr7	7
+
+
+/* General Purpose Registers (GPRs) */
+
+#define	r0	0
+#define	r1	1
+#define	r2	2
+#define	r3	3
+#define	r4	4
+#define	r5	5
+#define	r6	6
+#define	r7	7
+#define	r8	8
+#define	r9	9
+#define	r10	10
+#define	r11	11
+#define	r12	12
+#define	r13	13
+#define	r14	14
+#define	r15	15
+#define	r16	16
+#define	r17	17
+#define	r18	18
+#define	r19	19
+#define	r20	20
+#define	r21	21
+#define	r22	22
+#define	r23	23
+#define	r24	24
+#define	r25	25
+#define	r26	26
+#define	r27	27
+#define	r28	28
+#define	r29	29
+#define	r30	30
+#define	r31	31
+
+#endif /* PPC_ASM_H */