mirror of
https://github.com/wiiu-env/MochaLite.git
synced 2024-11-01 02:25:10 +01:00
115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
/* Patch for MCP_LoadFile (ioctl 0x53).
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*
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* Reference for most of the types and whatever:
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* https://github.com/exjam/decaf-emu/tree/ios/src/libdecaf/src/ios/mcp
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*
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* This is a proof of concept, and shouldn't be used until it's cleaned up a bit.
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* Co-authored by exjam, Maschell and QuarkTheAwesome
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*
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* Flow of calls:
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* - kernel loads system libraries, app rpx or user calls OSDynLoad
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* - goes to loader.elf, which will call ioctl 0x53
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* - with fileType = LOAD_FILE_CAFE_OS
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* - on failure, again with LOAD_FILE_PROCESS_CODE
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* - on failure, again with LOAD_FILE_SYS_DATA_CODE
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* - each request routes here where we can do whatever
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*/
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#include "logger.h"
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#include "ipc_types.h"
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typedef enum {
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//Load from the process's code directory (process title id)/code/%s
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LOAD_FILE_PROCESS_CODE = 0,
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//Load from the CafeOS directory (00050010-1000400A)/code/%s
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LOAD_FILE_CAFE_OS = 1,
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//Load from a system data title's content directory (0005001B-x)/content/%s
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LOAD_FILE_SYS_DATA_CONTENT = 2,
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//Load from a system data title's code directory (0005001B-x)/content/%s
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LOAD_FILE_SYS_DATA_CODE = 3,
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} MCPFileType;
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typedef struct {
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unsigned char unk[0x10];
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unsigned int pos;
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MCPFileType type;
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unsigned int cafe_pid;
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unsigned char unk2[0xC];
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char name[0x40];
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unsigned char unk3[0x12D8 - 0x68];
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} MCPLoadFileRequest;
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//sizeof(MCPLoadFileRequest) = 0x12D8
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int (*const real_MCP_LoadFile)(ipcmessage* msg) = (void*)0x0501CAA8 + 1; //+1 for thumb
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int (*const MCP_DoLoadFile)(const char* path, const char* path2, void* outputBuffer, u32 outLength, u32 pos, int* bytesRead, u32 unk) = (void*)0x05017248 + 1;
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int (*const MCP_UnknownStuff)(const char* path, u32 pos, void* outputBuffer, u32 outLength, u32 outLength2, u32 unk) = (void*)0x05014CAC + 1;
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int _MCP_LoadFile_patch(ipcmessage* msg) {
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if (!msg->ioctl.buffer_in) {
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log_printf("MCP_LoadFile: !msg->ioctl.buffer_in\n");
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return -29;
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}
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if (msg->ioctl.length_in != 0x12D8) {
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log_printf("MCP_LoadFile: Unexpected msg->ioctl.length_in = %u\n", msg->ioctl.length_in);
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return -29;
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}
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if (!msg->ioctl.buffer_io) {
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log_printf("MCP_LoadFile: !msg->ioctl.buffer_io\n");
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return -29;
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}
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if (!msg->ioctl.length_io) {
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log_printf("MCP_LoadFile: !msg->ioctl.length_io\n");
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return -29;
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}
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MCPLoadFileRequest* request = (MCPLoadFileRequest*)msg->ioctl.buffer_in;
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log_printf("MCP_LoadFile: msg->ioctl.buffer_io = %p, msg->ioctl.length_io = 0x%X\n", msg->ioctl.buffer_io, msg->ioctl.length_io);
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log_printf("MCP_LoadFile: request->type = %d, request->pos = %d, request->name = \"%s\"\n", request->type, request->pos, request->name);
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/* NOTE: removed LOAD_FILE_CAFE_OS check, since FIXME struct definition appears wrong for MCPLoadFileRequest->type */
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if (request->name[0] == '*') {
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char path[0x40];
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// Translate request->name to a path by replacing * with /
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for (int i = 0; i < 0x40; ++i) {
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if (request->name[i] == '*') {
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path[i] = '/';
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} else {
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path[i] = request->name[i];
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}
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}
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log_printf("MCP_LoadFile: Load custom path \"%s\"\n", path);
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/* TODO: If this fails, try last argument as 1 */
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int bytesRead = 0;
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int result = MCP_DoLoadFile(path, NULL, msg->ioctl.buffer_io, msg->ioctl.length_io, request->pos, &bytesRead, 0);
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log_printf("MCP_LoadFile: MCP_DoLoadFile returned %d, bytesRead = %d\n", result, bytesRead);
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if (result >= 0) {
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if (!bytesRead) {
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return 0;
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}
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/* TODO: If this fails, try last argument as 1 */
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result = MCP_UnknownStuff(path, request->pos, msg->ioctl.buffer_io, msg->ioctl.length_io, msg->ioctl.length_io, 0);
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log_printf("MCP_LoadFile: MCP_UnknownStuff returned %d\n", result);
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if (result < 0) {
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return result;
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} else {
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return bytesRead;
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}
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}
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}
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return real_MCP_LoadFile(msg);
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}
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