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src/sdk/modulemgr_patches.c

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+/*
+ * PSP Software Development Kit - http://www.pspdev.org
+ * -----------------------------------------------------------------------
+ * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
+ *
+ * modulemgr_patches.c - Patches for sceModuleManager libraries.
+ *
+ * Copyright (c) 2005 Marcus R. Brown <mrbrown@ocgnet.org>
+ * Copyright (c) 2005 James Forshaw <tyranid@gmail.com>
+ * Copyright (c) 2005 John Kelley <ps2dev@kelley.ca>
+ *
+ * $Id: modulemgr_patches.c 2166 2007-02-04 10:52:49Z tyranid $
+ */
+
+#include <psptypes.h>
+#include <psploadcore.h>
+#include <pspkerror.h>
+#include <psputils.h>
+#include <pspsdk.h>
+#include <string.h>
+
+#define MM_MODNAME "sceModuleManager"
+
+#ifdef F_InstallNoDeviceCheckPatch
+
+#define IOFILEMGR_LIBNAME "IoFileMgrForKernel"
+#define IOCTL_NID 0x63632449
+#define JR_RA_INSN 0x03e00008
+#define MOVE_V0_0_INSN 0x00001021
+
+/* Nullify sceModuleMangager's LoadDeviceCheck() (and related calls). */
+int pspSdkInstallNoDeviceCheckPatch(void)
+{
+	SceModule *mm_module;
+	SceLibraryStubTable *libstubtable;
+	int found, i;
+
+	mm_module = sceKernelFindModuleByName(MM_MODNAME);
+	if (mm_module == NULL) {
+		return SCE_KERNEL_ERROR_UNKNOWN_MODULE;
+	}
+
+	libstubtable = (SceLibraryStubTable *) mm_module->stub_top;
+	found = 0;
+	/* Find the stub entry table for IoFileMgrForKernel. */
+	while ((u32) libstubtable < ((u32) mm_module->stub_top + mm_module->stub_size)) {
+		if (strcmp(libstubtable->libname, IOFILEMGR_LIBNAME) == 0) {
+			found = 1;
+			break;
+		}
+
+		libstubtable = (SceLibraryStubTable *) ((u32) libstubtable + (libstubtable->len * 4));
+	}
+
+	if (!found) {
+		return SCE_KERNEL_ERROR_LIBRARY_NOTFOUND;
+	}
+
+	/* Find the NID for sceIoIoctl, and it's offset within the function stub table. */
+	for (i = 0; i < libstubtable->stubcount; i++) {
+		if (libstubtable->nidtable[i] == IOCTL_NID) {
+			/* Found it, so patch the stub to return 0 so that all device checks pass. */
+			u32 *ioctl_stub = (u32 *) ((u32) libstubtable->stubtable + (i * 8));
+
+			ioctl_stub[0] = JR_RA_INSN;
+			ioctl_stub[1] = MOVE_V0_0_INSN;
+			return 0;
+		}
+	} 
+
+	/* We couldn't find the stub entry. */
+	return SCE_KERNEL_ERROR_ERROR;
+}
+#endif /* F_InstallNoDeviceCheckPatch */
+
+#ifdef F_InstallNoPlainModuleCheckPatch
+
+#define LOAD_EXEC_PLAIN_CHECK 0x4000B000 /* mfc0 *, $22 */
+#define LOAD_EXEC_PLAIN_PATCH 0x34000001 /* li   *, 1 */
+
+
+extern u32 sceKernelProbeExecutableObject;
+extern u32 sceKernelCheckPspConfig;
+
+int pspSdkInstallNoPlainModuleCheckPatch(void)
+{
+    u32 *addr;
+    int i;
+
+    addr = (u32*) (0x80000000 | ((sceKernelProbeExecutableObject & 0x03FFFFFF) << 2));
+    //printf("sceKernelProbeExecutableObject %p\n", addr);
+    for(i = 0; i < 100; i++)
+    {
+        if((addr[i] & 0xFFE0FFFF) == LOAD_EXEC_PLAIN_CHECK)
+        {
+            //printf("Found instruction %p\n", &addr[i]);
+            addr[i] = (LOAD_EXEC_PLAIN_PATCH | (addr[i] & ~0xFFE0FFFF));
+        }
+    }
+
+    addr = (u32*) (0x80000000 | ((sceKernelCheckPspConfig & 0x03FFFFFF) << 2));
+    //printf("sceCheckPspConfig %p\n", addr);
+    for(i = 0; i < 100; i++)
+    {
+        if((addr[i] & 0xFFE0FFFF) == LOAD_EXEC_PLAIN_CHECK)
+        {
+            //printf("Found instruction %p\n", &addr[i]);
+            addr[i] = (LOAD_EXEC_PLAIN_PATCH | (addr[i] & ~0xFFE0FFFF));
+        }
+    }
+
+    sceKernelDcacheWritebackAll();
+
+    return 0;
+}
+#endif /* F_InstallNoPlainModuleCheckPatch */
+
+#ifdef F_InstallKernelLoadModulePatch
+
+#define LOAD_MODULE_KERN_CHECK 0x001BDC02 /* srl $k1, 16 */
+#define LOAD_MODULE_KERN_PATCH 0x0000d821 /* move $k1, $0 */
+
+extern u32 sceKernelLoadModuleWithApitype;
+void sceKernelIcacheInvalidateAll();
+
+int pspSdkInstallKernelLoadModulePatch(void)
+{
+    u32 *addr;
+    int i;
+
+    addr = (u32*) (0x80000000 | ((sceKernelLoadModuleWithApitype & 0x03FFFFFF) << 2));
+    for(i = 0; i < 100; i++)
+    {
+        if(addr[i] == LOAD_MODULE_KERN_CHECK)
+        {
+            addr[i] = LOAD_MODULE_KERN_PATCH;
+        }
+    }
+
+	sceKernelDcacheWritebackInvalidateAll();
+	sceKernelIcacheInvalidateAll();
+
+    return 0;
+}
+#endif