263 lines
8.3 KiB
C
Executable File
263 lines
8.3 KiB
C
Executable File
/*
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* firm.c
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* by Reisyukaku
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* Copyright (c) 2015 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 "loader.h"
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firmHeader *firmLocation = (firmHeader *)0x24000000;
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firmSectionHeader *section;
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u32 firmSize = 0,
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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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updatedSys = 0,
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usePatchedFirm = 0;
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u16 pressed;
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char *firmPathPatched = NULL;
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void setupCFW(void){
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//Determine if booting with A9LH via PDN_SPI_CNT
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u8 a9lhBoot = (*(u8 *)0x101401C0 == 0x0) ? 1 : 0;
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//Retrieve the last booted FIRM via CFG_BOOTENV
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u8 previousFirm = *(u8 *)0x10010000;
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u32 overrideConfig = 0;
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const char lastConfigPath[] = "rei/lastbootcfg";
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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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pressed = HID_PAD;
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//Determine if A9LH is installed
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if(a9lhBoot || fileExists("/rei/installeda9lh")){
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a9lhSetup = 1;
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//Check flag for > 9.2 SysNAND
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if(fileExists("/rei/updatedsysnand")) updatedSys = 1;
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}
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//If booting with A9LH and it's a MCU reboot, try to force boot options
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if(a9lhBoot && previousFirm && fileExists(lastConfigPath)){
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u8 tempConfig;
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fileRead(&tempConfig, lastConfigPath, 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 = tempConfig & 0x1;
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overrideConfig = 1;
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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 = tempConfig & 0x1;
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emuNAND = (tempConfig >> 1) & 0x1;
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overrideConfig = 1;
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}
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}
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if(!overrideConfig){
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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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//Check if it's a no-screen-init A9LH boot via PDN_GPU_CNT
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if(*(u8 *)0x10141200 != 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))) emuNAND = 1;
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//Write the current boot options on A9LH
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if(a9lhBoot){
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u8 tempConfig = (mode | (emuNAND << 1)) & 0x3;
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fileWrite(&tempConfig, lastConfigPath, 1);
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}
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}
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if(mode) firmPathPatched = emuNAND ? "/rei/patched_firmware_emu.bin" :
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"/rei/patched_firmware_sys.bin";
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//Skip decrypting and patching FIRM
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if(fileExists("/rei/usepatchedfw")){
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//Only needed with this flag
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if(!mode) firmPathPatched = "/rei/patched_firmware90.bin";
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if(fileExists(firmPathPatched)) usePatchedFirm = 1;
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}
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}
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//Load firm into FCRAM
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u32 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) return 0;
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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 ? firmPathPatched :
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(mode ? "/rei/firmware.bin" : "/rei/firmware90.bin");
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firmSize = fileSize(path);
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if(!firmSize) return 0;
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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)) return 0;
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if(console && !usePatchedFirm)
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decArm9Bin((u8 *)firmLocation + section[2].offset, mode);
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return 1;
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}
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//Nand redirection
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u32 loadEmu(void){
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u32 emuOffset = 0,
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emuHeader = 0,
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emuRead = 0,
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emuWrite = 0,
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sdmmcOffset = 0,
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mpuOffset = 0,
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emuCodeOffset = 0;
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//Read emunand code from SD
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const char path[] = "/rei/emunand/emunand.bin";
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u32 size = fileSize(path);
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if(!size) return 0;
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if(!console || !mode) nandRedir[5] = 0xA4;
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//Find offset for emuNAND code from the offset in nandRedir
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emuCodeOffset = *(u32 *)(nandRedir + 4) - (u32)section[2].address +
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section[2].offset + (u32)firmLocation;
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fileRead((u8 *)emuCodeOffset, path, size);
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//Find and patch emunand related offsets
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u32 *pos_sdmmc = (u32 *)memsearch((void *)emuCodeOffset, "SDMC", size, 4);
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u32 *pos_offset = (u32 *)memsearch((void *)emuCodeOffset, "NAND", size, 4);
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u32 *pos_header = (u32 *)memsearch((void *)emuCodeOffset, "NCSD", size, 4);
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getSDMMC(firmLocation, &sdmmcOffset, firmSize);
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getEmunandSect(&emuOffset, &emuHeader);
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getEmuRW(firmLocation, firmSize, &emuRead, &emuWrite);
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getMPU(firmLocation, &mpuOffset, firmSize);
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*pos_sdmmc = sdmmcOffset;
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*pos_offset = emuOffset;
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*pos_header = emuHeader;
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//Patch emuNAND code in memory for O3DS and 9.0 N3DS
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if(!console || !mode){
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void *pos_instr = memsearch((void *)emuCodeOffset, "\xA6\x01\x08\x30", size, 4);
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memcpy(pos_instr, emuInstr, sizeof(emuInstr));
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}
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//Add emunand hooks
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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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memcpy((void *)mpuOffset, mpu, sizeof(mpu));
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return 1;
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}
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//Patches
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u32 patchFirm(void){
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//Skip patching
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if(usePatchedFirm) return 1;
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//Apply emuNAND patches
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if(emuNAND){
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if(!loadEmu()) return 0;
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}
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else if(a9lhSetup){
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//Patch FIRM partitions writes on SysNAND to protect A9LH
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u32 writeOffset = 0;
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getFIRMWrite(firmLocation, firmSize, &writeOffset);
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memcpy((void *)writeOffset, FIRMblock, sizeof(FIRMblock));
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}
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//Disable signature checks
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u32 sigOffset = 0,
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sigOffset2 = 0;
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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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u32 *arm9 = (u32 *)&firmLocation->arm9Entry;
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*arm9 = 0x801B01C;
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}
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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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u32 rebootOffset = 0,
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fOpenOffset = 0;
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//Read reboot code from SD
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const char path[] = "/rei/reboot/reboot.bin";
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u32 size = fileSize(path);
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if(!size) return 0;
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getReboot(firmLocation, firmSize, &rebootOffset);
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fileRead((u8 *)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((void *)rebootOffset, "OPEN", size, 4);
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getfOpen(firmLocation, firmSize, &fOpenOffset);
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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((void *)rebootOffset, L"sy", size, 4);
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memcpy(pos_path, L"emu", 5);
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}
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}
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//Write patched FIRM to SD if needed
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if(firmPathPatched)
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if(!fileWrite((u8 *)firmLocation, firmPathPatched, firmSize)) return 0;
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return 1;
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}
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void launchFirm(void){
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if(console && mode) setKeyXs((u8 *)firmLocation + section[2].offset);
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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, (u8 *)firmLocation + section[2].offset, section[2].size);
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//Run ARM11 screen stuff
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vu32 *arm11 = (vu32 *)0x1FFFFFF8;
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*arm11 = (u32)shutdownLCD;
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while(*arm11);
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//Set ARM11 kernel
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*arm11 = (u32)firmLocation->arm11Entry;
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//Final jump to arm9 binary
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((void (*)())firmLocation->arm9Entry)();
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} |