Added function for installing syscall 0x25 (KernelCopyData)

source/fs/FSUtils.cpp

@@ -5,6 +5,7 @@
 #include <fcntl.h>
 #include "FSUtils.h"
 #include "CFile.hpp"
+#include "utils/logger.h"
 
 s32 FSUtils::LoadFileToMem(const char *filepath, u8 **inbuffer, u32 *size){
     //! always initialze input
@@ -143,6 +144,7 @@ bool FSUtils::saveBufferToFile(const char * path, void * buffer, u32 size){
     close(res);
     CFile file(path, CFile::WriteOnly);
     if (!file.isOpen()){
+        DEBUG_FUNCTION_LINE("Failed to open %s\n",path);
         return false;
     }
     file.write((const u8*) buffer,size);

source/kernel/kernel_utils.c

@@ -0,0 +1,146 @@
+#include <dynamic_libs/os_defs.h>
+#include <dynamic_libs/os_functions.h>
+
+static void KernelCopyData(unsigned int addr, unsigned int src, unsigned int len){
+    /*
+     * Setup a DBAT access with cache inhibited to write through and read directly from memory
+     */
+    unsigned int dbatu0, dbatl0, dbatu1, dbatl1;
+    // save the original DBAT value
+    asm volatile("mfdbatu %0, 0" : "=r" (dbatu0));
+    asm volatile("mfdbatl %0, 0" : "=r" (dbatl0));
+    asm volatile("mfdbatu %0, 1" : "=r" (dbatu1));
+    asm volatile("mfdbatl %0, 1" : "=r" (dbatl1));
+
+    unsigned int target_dbatu0 = 0;
+    unsigned int target_dbatl0 = 0;
+    unsigned int target_dbatu1 = 0;
+    unsigned int target_dbatl1 = 0;
+
+    unsigned char *dst_p = (unsigned char*)addr;
+    unsigned char *src_p = (unsigned char*)src;
+
+    // we only need DBAT modification for addresses out of our own DBAT range
+    // as our own DBAT is available everywhere for user and supervisor
+    // since our own DBAT is on DBAT5 position we don't collide here
+    if(addr < 0x00800000 || addr >= 0x01000000)
+    {
+        target_dbatu0 = (addr & 0x00F00000) | 0xC0000000 | 0x1F;
+        target_dbatl0 = (addr & 0xFFF00000) | 0x32;
+        asm volatile("mtdbatu 0, %0" : : "r" (target_dbatu0));
+        asm volatile("mtdbatl 0, %0" : : "r" (target_dbatl0));
+        dst_p = (unsigned char*)((addr & 0xFFFFFF) | 0xC0000000);
+    }
+    if(src < 0x00800000 || src >= 0x01000000)
+    {
+        target_dbatu1 = (src & 0x00F00000) | 0xB0000000 | 0x1F;
+        target_dbatl1 = (src & 0xFFF00000) | 0x32;
+
+        asm volatile("mtdbatu 1, %0" : : "r" (target_dbatu1));
+        asm volatile("mtdbatl 1, %0" : : "r" (target_dbatl1));
+        src_p = (unsigned char*)((src & 0xFFFFFF) | 0xB0000000);
+    }
+
+    asm volatile("eieio; isync");
+
+    unsigned int i;
+    for(i = 0; i < len; i++)
+    {
+        // if we are on the edge to next chunk
+        if((target_dbatu0 != 0) && (((unsigned int)dst_p & 0x00F00000) != (target_dbatu0 & 0x00F00000)))
+        {
+            target_dbatu0 = ((addr + i) & 0x00F00000) | 0xC0000000 | 0x1F;
+            target_dbatl0 = ((addr + i) & 0xFFF00000) | 0x32;
+            dst_p = (unsigned char*)(((addr + i) & 0xFFFFFF) | 0xC0000000);
+
+            asm volatile("eieio; isync");
+            asm volatile("mtdbatu 0, %0" : : "r" (target_dbatu0));
+            asm volatile("mtdbatl 0, %0" : : "r" (target_dbatl0));
+            asm volatile("eieio; isync");
+        }
+        if((target_dbatu1 != 0) && (((unsigned int)src_p & 0x00F00000) != (target_dbatu1 & 0x00F00000)))
+        {
+            target_dbatu1 = ((src + i) & 0x00F00000) | 0xB0000000 | 0x1F;
+            target_dbatl1 = ((src + i) & 0xFFF00000) | 0x32;
+            src_p = (unsigned char*)(((src + i) & 0xFFFFFF) | 0xB0000000);
+
+            asm volatile("eieio; isync");
+            asm volatile("mtdbatu 1, %0" : : "r" (target_dbatu1));
+            asm volatile("mtdbatl 1, %0" : : "r" (target_dbatl1));
+            asm volatile("eieio; isync");
+        }
+
+        *dst_p = *src_p;
+
+        ++dst_p;
+        ++src_p;
+    }
+
+    /*
+     * Restore original DBAT value
+     */
+    asm volatile("eieio; isync");
+    asm volatile("mtdbatu 0, %0" : : "r" (dbatu0));
+    asm volatile("mtdbatl 0, %0" : : "r" (dbatl0));
+    asm volatile("mtdbatu 1, %0" : : "r" (dbatu1));
+    asm volatile("mtdbatl 1, %0" : : "r" (dbatl1));
+    asm volatile("eieio; isync");
+}
+
+/* Read a 32-bit word with kernel permissions */
+uint32_t __attribute__ ((noinline)) kern_read(const void *addr)
+{
+	uint32_t result;
+	asm volatile (
+		"li 3,1\n"
+		"li 4,0\n"
+		"li 5,0\n"
+		"li 6,0\n"
+		"li 7,0\n"
+		"lis 8,1\n"
+		"mr 9,%1\n"
+		"li 0,0x3400\n"
+		"mr %0,1\n"
+		"sc\n"
+		"nop\n"
+		"mr 1,%0\n"
+		"mr %0,3\n"
+		:	"=r"(result)
+		:	"b"(addr)
+		:	"memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10",
+			"11", "12"
+	);
+
+	return result;
+}
+
+/* Write a 32-bit word with kernel permissions */
+void __attribute__ ((noinline)) kern_write(void *addr, uint32_t value)
+{
+	asm volatile (
+		"li 3,1\n"
+		"li 4,0\n"
+		"mr 5,%1\n"
+		"li 6,0\n"
+		"li 7,0\n"
+		"lis 8,1\n"
+		"mr 9,%0\n"
+		"mr %1,1\n"
+		"li 0,0x3500\n"
+		"sc\n"
+		"nop\n"
+		"mr 1,%1\n"
+		:
+		:	"r"(addr), "r"(value)
+		:	"memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10",
+			"11", "12"
+		);
+}
+
+void init_kernel_syscalls(){
+    kern_write((void*)(OS_SPECIFICS->addr_KernSyscallTbl1 + (0x25 * 4)), (unsigned int)KernelCopyData);
+    kern_write((void*)(OS_SPECIFICS->addr_KernSyscallTbl2 + (0x25 * 4)), (unsigned int)KernelCopyData);
+    kern_write((void*)(OS_SPECIFICS->addr_KernSyscallTbl3 + (0x25 * 4)), (unsigned int)KernelCopyData);
+    kern_write((void*)(OS_SPECIFICS->addr_KernSyscallTbl4 + (0x25 * 4)), (unsigned int)KernelCopyData);
+    kern_write((void*)(OS_SPECIFICS->addr_KernSyscallTbl5 + (0x25 * 4)), (unsigned int)KernelCopyData);
+}

source/kernel/kernel_utils.h

@@ -0,0 +1,14 @@
+#ifndef __KERNEL_UTILS_H_
+#define __KERNEL_UTILS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void init_kernel_syscalls();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __KERNEL_UTILS_H_