320 lines
11 KiB
C
Executable File
320 lines
11 KiB
C
Executable File
/*
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* firm.c
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* by Reisyukaku / Aurora Wright
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* Copyright (c) 2016 All Rights Reserved
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*/
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#include "firm.h"
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#include "patches.h"
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#include "memory.h"
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#include "fs.h"
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#include "emunand.h"
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#include "crypto.h"
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#include "draw.h"
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#include "screeninit.h"
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#include "loader.h"
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#include "utils.h"
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#include "buttons.h"
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#include "../build/patches.h"
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//FIRM patches version
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#define PATCH_VER 3
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static firmHeader *const firm = (firmHeader *)0x24000000;
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static const firmSectionHeader *section;
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static u8 *arm9Section;
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static const char *patchedFirms[] = { "/aurei/patched_firmware_sys.bin",
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"/aurei/patched_firmware_emu.bin",
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"/aurei/patched_firmware_em2.bin",
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"/aurei/patched_firmware90.bin" };
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static u32 firmSize,
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console,
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mode,
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emuNAND,
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a9lhSetup,
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selectedFirm,
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usePatchedFirm,
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emuOffset,
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emuHeader;
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void setupCFW(void){
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//Determine if booting with A9LH
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u32 a9lhBoot = (PDN_SPI_CNT == 0x0) ? 1 : 0;
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//Retrieve the last booted FIRM
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u8 previousFirm = CFG_BOOTENV;
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//Detect the console being used
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console = (PDN_MPCORE_CFG == 1) ? 0 : 1;
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//Get pressed buttons
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u16 pressed = HID_PAD;
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//Attempt to read the configuration file
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const char configPath[] = "aurei/config.bin";
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u32 config = 0,
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tempConfig = (PATCH_VER << 17) | (a9lhSetup << 16);
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u32 needConfig = fileRead(&config, configPath, 3) ? 1 : 2;
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//Determine if A9LH is installed and the user has an updated sysNAND
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u32 updatedSys;
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if(a9lhBoot || (config >> 2) & 1){
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if(pressed == SAFE_MODE)
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error("Using Safe Mode would brick you, or remove A9LH!");
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a9lhSetup = 1;
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//Check setting for > 9.2 sysNAND
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updatedSys = config & 1;
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} else{
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a9lhSetup = 0;
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updatedSys = 0;
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}
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/* If booting with A9LH, it's a MCU reboot and a previous configuration exists,
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try to force boot options */
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if(a9lhBoot && previousFirm && needConfig == 1){
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//Always force a sysNAND boot when quitting AGB_FIRM
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if(previousFirm == 7){
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mode = updatedSys ? 1 : (config >> 12) & 1;
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emuNAND = 0;
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tempConfig |= 1 << 15;
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needConfig = 0;
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//Else, force the last used boot options unless A, L or R are pressed
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} else if(!(pressed & OPTION_BUTTONS) && ((config >> 15) & 1)){
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mode = (config >> 12) & 1;
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emuNAND = (config >> 13) & 3;
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needConfig = 0;
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}
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}
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if(needConfig){
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/* If L and one of the payload buttons are pressed, and if not using A9LH
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the Safe Mode combo is not pressed, chainload an external payload */
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if((pressed & BUTTON_L1) && (pressed & PAYLOAD_BUTTONS) &&
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pressed != SAFE_MODE) loadPayload();
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//If no configuration file exists or SELECT is held, load configuration menu
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if(needConfig == 2 || (pressed & BUTTON_SELECT))
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configureCFW(configPath, patchedFirms[3]);
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//If screens are inited, load splash screen
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if(PDN_GPU_CNT != 1) loadSplash();
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/* If L is pressed, boot 9.0 FIRM */
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mode = ((config >> 3) & 1) ? ((!(pressed & BUTTON_L1R1)) ? 0 : 1) :
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((pressed & BUTTON_L1) ? 0 : 1);
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/* If L or R aren't pressed on a 9.0/9.2 sysNAND, or the 9.0 FIRM is selected
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or R is pressed on a > 9.2 sysNAND, boot emuNAND */
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if((updatedSys && (!mode || (pressed & BUTTON_R1))) ||
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(!updatedSys && mode && !(pressed & BUTTON_R1))){
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//If not 9.0 FIRM and B is pressed, attempt booting the second emuNAND
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emuNAND = (mode && ((!(pressed & BUTTON_B)) == ((config >> 4) & 1))) ? 2 : 1;
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} else emuNAND = 0;
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/* If tha FIRM patches version is different or user switched to/from A9LH,
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delete all patched FIRMs */
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if((tempConfig & 0xFF0000) != (config & 0xFF0000))
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deleteFirms(patchedFirms, sizeof(patchedFirms) / sizeof(char *));
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}
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u32 usePatchedFirmSet = ((config >> 1) & 1);
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while(1){
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/* Determine which patched FIRM we need to write or attempt to use (if any).
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Patched 9.0 FIRM is only needed if "Use pre-patched FIRMs" is set */
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selectedFirm = mode ? (emuNAND ? (emuNAND == 1 ? 2 : 3) : 1) :
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(usePatchedFirmSet ? 4 : 0);
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//If "Use pre-patched FIRMs" is set and the appropriate FIRM exists, use it
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if(usePatchedFirmSet && fileExists(patchedFirms[selectedFirm - 1]))
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usePatchedFirm = 1;
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//Detect EmuNAND
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else if(emuNAND){
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getEmunandSect(&emuOffset, &emuHeader, &emuNAND);
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//If none exists, force SysNAND + 9.6/10.x FIRM and re-detect patched FIRMs
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if(!emuNAND){
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mode = 1;
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continue;
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}
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}
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break;
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}
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tempConfig |= (emuNAND << 13) | (mode << 12);
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//If the boot configuration is different from previously, overwrite it
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if(tempConfig != (config & 0xFFF000)){
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//Preserve user settings (first 12 bits)
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tempConfig |= config & 0xFFF;
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fileWrite(&tempConfig, configPath, 3);
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}
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}
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//Load FIRM into FCRAM
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void loadFirm(void){
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//If not using an A9LH setup or the patched FIRM, load 9.0 FIRM from NAND
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if(!usePatchedFirm && !a9lhSetup && !mode){
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//Read FIRM from NAND and write to FCRAM
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firmSize = console ? 0xF2000 : 0xE9000;
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nandFirm0((u8 *)firm, firmSize, console);
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//Check for correct decryption
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if(memcmp(firm, "FIRM", 4) != 0)
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error("Couldn't decrypt NAND FIRM0 (O3DS not on 9.x?)");
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}
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//Load FIRM from SD
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else{
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const char *path = usePatchedFirm ? patchedFirms[selectedFirm - 1] :
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(mode ? "/aurei/firmware.bin" : "/aurei/firmware90.bin");
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firmSize = fileSize(path);
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if(!firmSize) error("aurei/firmware(90).bin doesn't exist");
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fileRead(firm, path, firmSize);
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}
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section = firm->section;
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//Check that the loaded FIRM matches the console
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if((((u32)section[2].address >> 8) & 0xFF) != (console ? 0x60 : 0x68))
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error("aurei/firmware(90).bin doesn't match this\nconsole, or it's encrypted");
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arm9Section = (u8 *)firm + section[2].offset;
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if(console && !usePatchedFirm) decryptArm9Bin(arm9Section, mode);
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}
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//NAND redirection
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static inline void loadEmu(u8 *proc9Offset){
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//Copy emuNAND code
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void *emuCodeOffset = getEmuCode(proc9Offset);
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memcpy(emuCodeOffset, emunand, emunand_size);
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//Add the data of the found emuNAND
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u32 *pos_offset = (u32 *)memsearch(emuCodeOffset, "NAND", emunand_size, 4);
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u32 *pos_header = (u32 *)memsearch(emuCodeOffset, "NCSD", emunand_size, 4);
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*pos_offset = emuOffset;
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*pos_header = emuHeader;
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//Find and add the SDMMC struct
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u32 *pos_sdmmc = (u32 *)memsearch(emuCodeOffset, "SDMC", emunand_size, 4);
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*pos_sdmmc = getSDMMC(arm9Section, section[2].size);
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//Calculate offset for the hooks
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u32 branchOffset = (u32)emuCodeOffset - (u32)firm -
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section[2].offset + (u32)section[2].address;
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//Add emunand hooks
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u32 emuRead,
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emuWrite;
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getEmuRW(arm9Section, section[2].size, &emuRead, &emuWrite);
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*(u16 *)emuRead = nandRedir[0];
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*((u16 *)emuRead + 1) = nandRedir[1];
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*((u32 *)emuRead + 1) = branchOffset;
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*(u16 *)emuWrite = nandRedir[0];
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*((u16 *)emuWrite + 1) = nandRedir[1];
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*((u32 *)emuWrite + 1) = branchOffset;
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//Set MPU for emu code region
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u32 *mpuOffset = getMPU(arm9Section, section[2].size);
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*mpuOffset = mpuPatch[0];
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*(mpuOffset + 6) = mpuPatch[1];
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*(mpuOffset + 9) = mpuPatch[2];
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}
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//Patches
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void patchFirm(void){
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//Skip patching
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if(usePatchedFirm) return;
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if(mode || emuNAND){
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//Find the Process9 NCCH location
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u8 *proc9Offset = getProc9(arm9Section, section[2].size);
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//Apply emuNAND patches
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if(emuNAND) loadEmu(proc9Offset);
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//Patch FIRM reboots, not on 9.0 FIRM as it breaks firmlaunchhax
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if(mode){
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//Calculate offset for the firmlaunch code
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void *rebootOffset = getReboot(arm9Section, section[2].size);
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//Calculate offset for the fOpen function
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u32 fOpenOffset = getfOpen(proc9Offset, rebootOffset);
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//Copy firmlaunch code
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memcpy(rebootOffset, reboot, reboot_size);
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//Put the fOpen offset in the right location
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u32 *pos_fopen = (u32 *)memsearch(rebootOffset, "OPEN", reboot_size, 4);
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*pos_fopen = fOpenOffset;
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//Patch path for emuNAND-patched FIRM
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if(emuNAND){
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void *pos_path = memsearch(rebootOffset, L"sy", reboot_size, 4);
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memcpy(pos_path, emuNAND == 1 ? L"emu" : L"em2", 5);
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}
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}
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}
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if(a9lhSetup && !emuNAND){
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//Patch FIRM partitions writes on sysNAND to protect A9LH
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u16 *writeOffset = getFirmWrite(arm9Section, section[2].size);
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*writeOffset = writeBlock[0];
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*(writeOffset + 1) = writeBlock[1];
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}
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//Disable signature checks
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u32 sigOffset,
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sigOffset2;
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getSigChecks(arm9Section, section[2].size, &sigOffset, &sigOffset2);
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*(u16 *)sigOffset = sigPatch[0];
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*(u16 *)sigOffset2 = sigPatch[0];
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*((u16 *)sigOffset2 + 1) = sigPatch[1];
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//Replace the FIRM loader with the injector
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u32 loaderOffset,
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loaderSize;
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getLoader((u8 *)firm + section[0].offset, section[0].size, &loaderOffset, &loaderSize);
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//Check that the injector CXI isn't larger than the original
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if(injector_size <= (int)loaderSize){
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memset((void *)loaderOffset, 0, loaderSize);
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memcpy((void *)loaderOffset, injector, injector_size);
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//Patch content size and ExeFS size to match the repaced loader's ones
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*((u32 *)loaderOffset + 0x41) = loaderSize / 0x200;
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*((u32 *)loaderOffset + 0x69) = loaderSize / 0x200 - 5;
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}
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//Patch ARM9 entrypoint on N3DS to skip arm9loader
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if(console)
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firm->arm9Entry = (u8 *)0x801B01C;
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//Write patched FIRM to SD if needed
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if(selectedFirm)
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if(!fileWrite(firm, patchedFirms[selectedFirm - 1], firmSize))
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error("Couldn't write the patched FIRM (no free space?)");
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}
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void launchFirm(void){
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if(console && mode) setKeyXs(arm9Section);
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//Copy firm partitions to respective memory locations
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memcpy(section[0].address, (u8 *)firm + section[0].offset, section[0].size);
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memcpy(section[1].address, (u8 *)firm + section[1].offset, section[1].size);
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memcpy(section[2].address, arm9Section, section[2].size);
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//Fixes N3DS 3D
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deinitScreens();
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//Set ARM11 kernel entrypoint
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*(vu32 *)0x1FFFFFF8 = (u32)firm->arm11Entry;
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//Final jump to arm9 kernel
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((void (*)())firm->arm9Entry)();
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} |