280 lines
9.6 KiB
C
Executable File
280 lines
9.6 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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//FIRM patches version
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#define PATCH_VER 1
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static firmHeader *const firmLocation = (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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mode = 1,
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console = 1,
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emuNAND = 0,
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a9lhSetup = 0,
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usePatchedFirm = 0,
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selectedFirm = 0;
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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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if(PDN_MPCORE_CFG == 1) console = 0;
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//Get pressed buttons
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u16 pressed = HID_PAD;
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u32 updatedSys = 0;
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//Attempt to read the configuration file
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const char configPath[] = "aurei/config.bin";
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u16 config = 0;
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u32 needConfig = fileRead((u8 *)&config, configPath, 2) ? 1 : 2;
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//Determine if A9LH is installed
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if(a9lhBoot || (config >> 2) & 0x1){
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a9lhSetup = 1;
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//Check setting for > 9.2 SysNAND
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updatedSys = config & 0x1;
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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 == 0x7){
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if(!updatedSys) mode = (config >> 8) & 0x1;
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needConfig = 0;
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//Else, force the last used boot options unless A is pressed
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} else if(!(pressed & BUTTON_A)){
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mode = (config >> 8) & 0x1;
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emuNAND = (config >> 9) & 0x1;
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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 R are pressed, chainload an external payload
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if(a9lhBoot && (pressed & BUTTON_L1R1) == BUTTON_L1R1) 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);
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//If screens are inited, load splash screen
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if(PDN_GPU_CNT != 0x1) loadSplash();
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/* If L is pressed, and on an updated SysNAND setup the SAFE MODE combo
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is not pressed, boot 9.0 FIRM */
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if((pressed & BUTTON_L1) && !(updatedSys && pressed == SAFEMODE)) mode = 0;
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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) && pressed != SAFEMODE))) ||
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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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if(mode && (pressed & BUTTON_B)) emuNAND = 2;
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else emuNAND = 1;
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}
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/* If tha FIRM patches version is different or user switched to/from A9LH,
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and "Use pre-patched FIRMs" is set, delete all patched FIRMs */
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u16 bootConfig = (PATCH_VER << 11) | (!a9lhSetup << 10);
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if ((config >> 1) & 0x1 && bootConfig != (config & 0xFC00))
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deleteFirms(patchedFirms, sizeof(patchedFirms) / sizeof(char *));
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//We also need to remember the used boot mode on A9LH
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if(a9lhBoot) bootConfig |= (mode << 8) | (emuNAND << 9);
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//If boot configuration is different from previously, overwrite it
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if(bootConfig != (config & 0xFF00)){
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//Preserve user settings (first byte)
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u16 tempConfig = ((config & 0xFF) | bootConfig);
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fileWrite((u8 *)&tempConfig, configPath, 2);
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}
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}
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if(mode) selectedFirm = emuNAND ? (emuNAND == 1 ? 2 : 3) : 1;
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//Skip decrypting and patching FIRM
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if((config >> 1) & 0x1){
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//Only needed with this setting
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if(!mode) selectedFirm = 4;
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if(fileExists(patchedFirms[selectedFirm - 1])) usePatchedFirm = 1;
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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 *)firmLocation, firmSize, console);
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//Check for correct decryption
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if(memcmp(firmLocation, "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((u8 *)firmLocation, path, firmSize);
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}
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section = firmLocation->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 *)firmLocation + 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 void loadEmu(u8 *proc9Offset){
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u32 emuOffset = 1,
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emuHeader = 1,
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emuRead,
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emuWrite;
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//Read emunand code from SD
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const char path[] = "/aurei/patches/emunand.bin";
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u32 size = fileSize(path);
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if(!size) error("aurei/patches/emunand.bin doesn't exist");
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u8 *emuCodeOffset = getEmuCode(arm9Section, section[2].size, proc9Offset);
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fileRead(emuCodeOffset, path, size);
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//Look for emuNAND
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getEmunandSect(&emuOffset, &emuHeader, emuNAND);
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//No emuNAND detected
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if(!emuHeader) error("No emuNAND has been detected");
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//Place emuNAND data
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u32 *pos_offset = (u32 *)memsearch(emuCodeOffset, "NAND", size, 4);
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u32 *pos_header = (u32 *)memsearch(emuCodeOffset, "NCSD", size, 4);
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*pos_offset = emuOffset;
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*pos_header = emuHeader;
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//Find and place the SDMMC struct
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u32 *pos_sdmmc = (u32 *)memsearch(emuCodeOffset, "SDMC", 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 *)(nandRedir + 4) = (u32)emuCodeOffset - (u32)firmLocation -
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section[2].offset + (u32)section[2].address;
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//Add emunand hooks
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getEmuRW(arm9Section, section[2].size, &emuRead, &emuWrite);
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memcpy((void *)emuRead, nandRedir, sizeof(nandRedir));
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memcpy((void *)emuWrite, nandRedir, sizeof(nandRedir));
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//Set MPU for emu code region
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void *mpuOffset = getMPU(arm9Section, section[2].size);
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memcpy(mpuOffset, mpu, sizeof(mpu));
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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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//Read reboot code from SD
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const char path[] = "/aurei/patches/reboot.bin";
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u32 size = fileSize(path);
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if(!size) error("aurei/patches/reboot.bin doesn't exist");
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u8 *rebootOffset = getReboot(arm9Section, section[2].size);
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fileRead(rebootOffset, path, size);
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//Calculate the fOpen offset and put it in the right location
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u32 *pos_fopen = (u32 *)memsearch(rebootOffset, "OPEN", size, 4);
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*pos_fopen = getfOpen(arm9Section, section[2].size, proc9Offset);
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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", 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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void *writeOffset = getFirmWrite(arm9Section, section[2].size);
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memcpy(writeOffset, writeBlock, sizeof(writeBlock));
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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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getSignatures(firmLocation, firmSize, &sigOffset, &sigOffset2);
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memcpy((void *)sigOffset, sigPat1, sizeof(sigPat1));
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memcpy((void *)sigOffset2, sigPat2, sizeof(sigPat2));
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//Patch ARM9 entrypoint on N3DS to skip arm9loader
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if(console)
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firmLocation->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((u8 *)firmLocation, 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 *)firmLocation + section[0].offset, section[0].size);
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memcpy(section[1].address, (u8 *)firmLocation + 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)firmLocation->arm11Entry;
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//Final jump to arm9 kernel
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((void (*)())firmLocation->arm9Entry)();
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} |