430 lines
13 KiB
C
Executable File
430 lines
13 KiB
C
Executable File
/*
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* firm.c
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*/
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#include "firm.h"
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#include "config.h"
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#include "utils.h"
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#include "fs.h"
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#include "patches.h"
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#include "memory.h"
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#include "emunand.h"
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#include "crypto.h"
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#include "exceptions.h"
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#include "draw.h"
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#include "screeninit.h"
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#include "buttons.h"
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#include "../build/injector.h"
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static firmHeader *const firm = (firmHeader *)0x24000000;
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static const firmSectionHeader *section;
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u32 config,
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console,
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firmSource,
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emuOffset;
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void main(void)
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{
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u32 bootType,
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firmType,
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nandType,
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a9lhMode,
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updatedSys,
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needConfig,
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newConfig,
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emuHeader,
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chronoStarted = 0;
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//Detect the console being used
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console = PDN_MPCORE_CFG == 7;
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//Mount filesystems. CTRNAND will be mounted only if/when needed
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mountFs();
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const char configPath[] = "/luma/config.bin";
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//Attempt to read the configuration file
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needConfig = fileRead(&config, configPath) ? 1 : 2;
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//Determine if this is a firmlaunch boot
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if(*(vu8 *)0x23F00005)
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{
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if(needConfig == 2) mcuReboot();
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bootType = 1;
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//'0' = NATIVE_FIRM, '1' = TWL_FIRM, '2' = AGB_FIRM
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firmType = *(vu8 *)0x23F00009 == '3' ? 3 : *(vu8 *)0x23F00005 - '0';
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nandType = BOOTCONFIG(0, 3);
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firmSource = BOOTCONFIG(2, 1);
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a9lhMode = BOOTCONFIG(3, 1);
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updatedSys = a9lhMode && CONFIG(1);
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}
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else
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{
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//Get pressed buttons
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u32 pressed = HID_PAD;
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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) && !(pressed & BUTTON_L1)))
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{
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configureCFW(configPath);
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//Zero the last booted FIRM flag
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CFG_BOOTENV = 0;
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chronoStarted = 1;
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chrono(0);
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chrono(2);
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//Update pressed buttons
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pressed = HID_PAD;
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}
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if(DEVMODE)
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{
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detectAndProcessExceptionDumps();
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installArm9Handlers();
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}
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bootType = 0;
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firmType = 0;
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//Determine if booting with A9LH
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u32 a9lhBoot = !PDN_SPI_CNT;
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//Determine if A9LH is installed and the user has an updated sysNAND
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if(a9lhBoot || CONFIG(2))
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{
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a9lhMode = 1;
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updatedSys = CONFIG(1);
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}
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else
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{
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a9lhMode = 0;
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updatedSys = 0;
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}
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newConfig = a9lhMode << 3;
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if(a9lhBoot)
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{
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//Retrieve the last booted FIRM
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u32 previousFirm = CFG_BOOTENV;
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//If it's a MCU reboot, try to force boot options
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if(previousFirm)
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{
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//Always force a sysNAND boot when quitting AGB_FIRM
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if(previousFirm == 7)
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{
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nandType = 0;
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firmSource = updatedSys ? 0 : BOOTCONFIG(2, 1);
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needConfig = 0;
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//Flag to prevent multiple boot options-forcing
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newConfig |= 1 << 4;
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}
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/* Else, force the last used boot options unless a button is pressed
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or the no-forcing flag is set */
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else if(!pressed && !BOOTCONFIG(4, 1))
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{
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nandType = BOOTCONFIG(0, 3);
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firmSource = BOOTCONFIG(2, 1);
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needConfig = 0;
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}
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}
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//If the SAFE MODE combo is held, force a sysNAND boot
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else if(pressed == SAFE_MODE)
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{
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a9lhMode = 2;
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nandType = 0;
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firmSource = 0;
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needConfig = 0;
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}
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}
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//Boot options aren't being forced
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if(needConfig)
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{
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/* If L and R/A/Select or one of the single payload buttons are pressed,
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chainload an external payload */
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if(DEVMODE || (pressed & SINGLE_PAYLOAD_BUTTONS) || ((pressed & BUTTON_L1) && (pressed & L_PAYLOAD_BUTTONS)))
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loadPayload(pressed);
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//If screens are inited or the corresponding option is set, load splash screen
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if((PDN_GPU_CNT != 1 || CONFIG(7)) && loadSplash())
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{
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chronoStarted = 2;
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chrono(0);
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}
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//If R is pressed, boot the non-updated NAND with the FIRM of the opposite one
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if(pressed & BUTTON_R1)
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{
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nandType = updatedSys;
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firmSource = !nandType;
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}
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/* Else, boot the NAND the user set to autoboot or the opposite one, depending on L,
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with their own FIRM */
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else
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{
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nandType = CONFIG(0) != !(pressed & BUTTON_L1);
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firmSource = nandType;
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}
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/* If we're booting emuNAND the second emuNAND is set as default and B isn't pressed,
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or vice-versa, boot the second emuNAND */
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if(nandType && (CONFIG(3) == !(pressed & BUTTON_B))) nandType = 2;
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}
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}
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//If we need to boot emuNAND, make sure it exists
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if(nandType)
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{
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locateEmuNAND(&emuOffset, &emuHeader, &nandType);
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if(!nandType) firmSource = 0;
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}
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//Same if we're using emuNAND as the FIRM source
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else if(firmSource)
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locateEmuNAND(&emuOffset, &emuHeader, &firmSource);
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if(!bootType)
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{
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newConfig |= nandType | (firmSource << 2);
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/* If the boot configuration is different from previously, overwrite it.
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Just the no-forcing flag being set is not enough */
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if((newConfig & 0x2F) != (config & 0x3F))
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{
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//Preserve user settings (last 26 bits)
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newConfig |= config & 0xFFFFFFC0;
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fileWrite(&newConfig, configPath, 4);
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}
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}
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loadFirm(firmType, !firmType && updatedSys == !firmSource);
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switch(firmType)
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{
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case 0:
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patchNativeFirm(nandType, emuHeader, a9lhMode);
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break;
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case 3:
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patchSafeFirm();
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break;
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default:
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patchLegacyFirm(firmType);
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break;
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}
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if(chronoStarted)
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{
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if(chronoStarted == 2) chrono(3);
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stopChrono();
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}
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launchFirm(firmType, bootType);
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}
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static inline void loadFirm(u32 firmType, u32 externalFirm)
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{
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section = firm->section;
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u32 externalFirmLoaded = externalFirm &&
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fileRead(firm, "/luma/firmware.bin") &&
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(((u32)section[2].address >> 8) & 0xFF) == (console ? 0x60 : 0x68);
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/* If the conditions to load the external FIRM aren't met, or reading fails, or the FIRM
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doesn't match the console, load FIRM from CTRNAND */
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if(!externalFirmLoaded)
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{
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const char *firmFolders[4][2] = {{ "00000002", "20000002" },
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{ "00000102", "20000102" },
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{ "00000202", "20000202" },
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{ "00000003", "20000003" }};
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firmRead(firm, firmFolders[firmType][console]);
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decryptExeFs((u8 *)firm);
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}
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}
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static inline void patchNativeFirm(u32 nandType, u32 emuHeader, u32 a9lhMode)
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{
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u8 *arm9Section = (u8 *)firm + section[2].offset,
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*arm11Section1 = (u8 *)firm + section[1].offset;
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u32 nativeFirmType;
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if(console)
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{
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//Determine the NATIVE_FIRM version
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switch(arm9Section[0x53])
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{
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case 0xFF:
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nativeFirmType = 0;
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break;
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case '1':
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nativeFirmType = 2;
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break;
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default:
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nativeFirmType = 1;
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break;
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}
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//Decrypt ARM9Bin and patch ARM9 entrypoint to skip arm9loader
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arm9Loader(arm9Section, nativeFirmType);
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firm->arm9Entry = (u8 *)0x801B01C;
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}
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else
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{
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//Determine if we're booting the 9.0 FIRM
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u8 firm90Hash[0x10] = {0x27, 0x2D, 0xFE, 0xEB, 0xAF, 0x3F, 0x6B, 0x3B, 0xF5, 0xDE, 0x4C, 0x41, 0xDE, 0x95, 0x27, 0x6A};
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nativeFirmType = memcmp(section[2].hash, firm90Hash, 0x10) != 0;
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}
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//Find the Process9 .code location, size and memory address
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u32 process9Size,
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process9MemAddr;
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u8 *process9Offset = getProcess9(arm9Section + 0x15000, section[2].size - 0x15000, &process9Size, &process9MemAddr);
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//Apply signature patches
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patchSignatureChecks(process9Offset, process9Size);
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//Apply emuNAND patches
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if(nandType)
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{
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u32 branchAdditive = (u32)firm + section[2].offset - (u32)section[2].address;
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patchEmuNAND(arm9Section, section[2].size, process9Offset, process9Size, emuOffset, emuHeader, branchAdditive);
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}
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//Apply FIRM0/1 writes patches on sysNAND to protect A9LH
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else if(a9lhMode) patchFirmWrites(process9Offset, process9Size);
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//Apply firmlaunch patches, not on 9.0 FIRM as it breaks firmlaunchhax
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if(nativeFirmType || a9lhMode == 2) patchFirmlaunches(process9Offset, process9Size, process9MemAddr);
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if(nativeFirmType == 1)
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{
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//Apply anti-anti-DG patches for >= 11.0 firmwares
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patchTitleInstallMinVersionCheck(process9Offset, process9Size);
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//Does nothing if svcBackdoor is still there
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reimplementSvcBackdoor(arm11Section1, section[1].size);
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}
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if(DEVMODE)
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{
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//Apply UNITINFO patch
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if(DEVMODE == 2) patchUnitInfoValueSet(arm9Section, section[2].size);
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//Install arm11 exception handlers
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u32 stackAddress, codeSetOffset;
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u32 *exceptionsPage = getInfoForArm11ExceptionHandlers(arm11Section1, section[1].size, &stackAddress, &codeSetOffset);
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installArm11Handlers(exceptionsPage, stackAddress, codeSetOffset);
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//Kernel9/Process9 debugging
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patchExceptionHandlersInstall(arm9Section, section[2].size);
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patchSvcBreak9(arm9Section, section[2].size, (u32)(section[2].address));
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//Stub svcBreak11 with "bkpt 65535"
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patchSvcBreak11(arm11Section1, section[1].size);
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//Make FCRAM (and VRAM as a side effect) globally executable from arm11 kernel
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patchKernelFCRAMAndVRAMMappingPermissions(arm11Section1, section[1].size);
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}
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}
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static inline void patchLegacyFirm(u32 firmType)
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{
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u8 *arm9Section = (u8 *)firm + section[3].offset;
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//On N3DS, decrypt ARM9Bin and patch ARM9 entrypoint to skip arm9loader
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if(console)
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{
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arm9Loader(arm9Section, 0);
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firm->arm9Entry = (u8 *)0x801301C;
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}
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if(DEVMODE)
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{
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//Kernel9/Process9 debugging
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patchExceptionHandlersInstall(arm9Section, section[3].size);
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patchSvcBreak9(arm9Section, section[3].size, (u32)(section[3].address));
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}
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applyLegacyFirmPatches((u8 *)firm, firmType, console);
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}
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static inline void patchSafeFirm(void)
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{
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u8 *arm9Section = (u8 *)firm + section[2].offset;
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if(console)
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{
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//Decrypt ARM9Bin and patch ARM9 entrypoint to skip arm9loader
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arm9Loader(arm9Section, 0);
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firm->arm9Entry = (u8 *)0x801B01C;
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patchFirmWrites(arm9Section, section[2].size);
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}
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if(DEVMODE)
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{
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//Kernel9/Process9 debugging
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patchExceptionHandlersInstall(arm9Section, section[2].size);
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patchSvcBreak9(arm9Section, section[2].size, (u32)(section[2].address));
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}
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else patchFirmWriteSafe(arm9Section, section[2].size);
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}
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static inline void copySection0AndInjectLoader(void)
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{
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u8 *arm11Section0 = (u8 *)firm + section[0].offset;
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u32 loaderSize;
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u32 loaderOffset = getLoader(arm11Section0, &loaderSize);
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memcpy(section[0].address, arm11Section0, loaderOffset);
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memcpy(section[0].address + loaderOffset, injector, injector_size);
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memcpy(section[0].address + loaderOffset + injector_size, arm11Section0 + loaderOffset + loaderSize, section[0].size - (loaderOffset + loaderSize));
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}
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static inline void launchFirm(u32 firmType, u32 bootType)
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{
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//If we're booting NATIVE_FIRM, section0 needs to be copied separately to inject 3ds_injector
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u32 sectionNum;
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if(!firmType)
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{
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copySection0AndInjectLoader();
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sectionNum = 1;
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}
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else sectionNum = 0;
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//Copy FIRM sections to respective memory locations
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for(; sectionNum < 4 && section[sectionNum].size; sectionNum++)
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memcpy(section[sectionNum].address, (u8 *)firm + section[sectionNum].offset, section[sectionNum].size);
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//Determine the ARM11 entry to use
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vu32 *arm11;
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if(bootType) arm11 = (u32 *)0x1FFFFFFC;
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else
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{
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deinitScreens();
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arm11 = (u32 *)0x1FFFFFF8;
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}
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//Set ARM11 kernel entrypoint
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*arm11 = (u32)firm->arm11Entry;
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//Final jump to ARM9 kernel
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((void (*)())firm->arm9Entry)();
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} |