578 lines
18 KiB
C
Executable File
578 lines
18 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/patches.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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u64 chronoWhenSplashLoaded = 0;
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static inline void patchExceptionHandlersInstall(u8 *arm9Section)
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{
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static const u8 pattern[] = {
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0x18, 0x10, 0x80, 0xE5,
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0x10, 0x10, 0x80, 0xE5,
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0x20, 0x10, 0x80, 0xE5,
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0x28, 0x10, 0x80, 0xE5,
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}; //i.e when it stores ldr pc, [pc, #-4]
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u32* off = (u32 *)(memsearch(arm9Section, pattern, section[2].size, sizeof(pattern)));
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if(off == NULL) return;
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off += sizeof(pattern)/4;
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u32 r0 = 0x08000000;
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for(; *off != 0xE3A01040; off++) //until mov r1, #0x40
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{
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if((*off >> 26) != 0x39 || ((*off >> 16) & 0xf) != 0 || ((*off >> 25) & 1) != 0 || ((*off >> 20) & 5) != 0)
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continue; //discard everything that's not str rX, [r0, #imm](!)
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int rD = (*off >> 12) & 0xf;
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int offset = (*off & 0xfff) * ((((*off >> 23) & 1) == 0) ? -1 : 1);
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int writeback = (*off >> 21) & 1, pre = (*off >> 24) & 1;
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u32 addr = r0 + ((pre || !writeback) ? offset : 0);
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if(addr != 0x08000014 && addr != 0x08000004)
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*off = 0xE1A00000; //nop
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else
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*off = 0xE5800000 | (rD << 12) | (addr & 0xfff); //preserve IRQ and svc handlers
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if(!pre) addr += offset;
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if(writeback) r0 = addr;
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}
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}
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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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startChrono(0); //Start the chronometer. It shouldn't be reset.
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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))
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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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//Update pressed buttons
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pressed = HID_PAD;
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}
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u32 devMode = CONFIG(5);
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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--;
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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 payload button or A/L/R are pressed
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or the no-forcing flag is set */
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else if(!(pressed & OVERRIDE_BUTTONS) && !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--;
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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++;
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nandType = 0;
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firmSource = 0;
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needConfig--;
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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(8)) chronoWhenSplashLoaded = (u64) loadSplash();
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if(chronoWhenSplashLoaded) chronoWhenSplashLoaded = chrono();
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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++;
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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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getEmunandSect(&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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getEmunandSect(&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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patchExceptionHandlersInstall((u8 *)firm + section[2].offset);
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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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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 patchKernelFCRAMAndVRAMMappingPermissions(u8* arm11Section1)
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{
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static const u8 MMUConfigPattern[] = {
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0xC4, 0xDD, 0xFA, 0x1F,
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0x16, 0x64, 0x01, 0x00,
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0xBC, 0xDD, 0xFA, 0x1F,
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0x00, 0x50, 0xFF, 0x1F
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};
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u32* off = (u32 *)memsearch(arm11Section1, MMUConfigPattern, section[1].size, sizeof(MMUConfigPattern));
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if(off != NULL) off[1] &= ~(1 << 4); //clear XN bit
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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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u8 *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 = 1;
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break;
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default:
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nativeFirmType = 2;
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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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if(nativeFirmType || nandType || a9lhMode == 2)
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{
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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(nandType) patchEmuNAND(arm9Section, proc9Offset, emuHeader);
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//Apply FIRM reboot patches, not on 9.0 FIRM as it breaks firmlaunchhax
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if(nativeFirmType || a9lhMode == 2) patchReboots(arm9Section, proc9Offset);
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}
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//Apply FIRM0/1 writes patches on sysNAND to protect A9LH
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if(a9lhMode && !nandType) patchFirmWrites(arm9Section, 1);
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//Apply signature checks patches
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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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if(CONFIG(5))
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{
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//Apply UNITINFO patch
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u8 *unitInfoOffset = getUnitInfoValueSet(arm9Section, section[2].size);
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*unitInfoOffset = unitInfoPatch;
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//Make FCRAM (and VRAM as a side effect) globally executable from arm11 kernel
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patchKernelFCRAMAndVRAMMappingPermissions(arm11Section1);
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}
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reimplementSvcBackdoor(arm11Section1); //Does nothing if svcBackdoor is still there
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//Replace the FIRM loader with the injector while copying section0
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copySection0AndInjectLoader();
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}
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static inline void patchEmuNAND(u8 *arm9Section, u8 *proc9Offset, u32 emuHeader)
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{
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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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static inline void patchReboots(u8 *arm9Section, u8 *proc9Offset)
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{
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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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}
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static inline void reimplementSvcBackdoor(u8 *arm11Section1)
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{
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u32 *exceptionsPage = getExceptionVectorsPage(arm11Section1, section[1].size);
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if(exceptionsPage == NULL) return;
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u32 low24 = (exceptionsPage[2] & 0x00FFFFFF) << 2;
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u32 signMask = (u32)(-(low24 >> 25)) & 0xFC000000; //Sign extension
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int offset = (int)(low24 | signMask) + 8; //Branch offset + 8 for prefetch
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u32* svcTable = (u32 *)(arm11Section1 + *(u32 *)(arm11Section1 + 0xFFFF0008 + offset - 0xFFF00000 + 8) - 0xFFF00000); //svc handler address
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while(*svcTable != 0) svcTable++; //svc0 = NULL
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if(svcTable[0x7B] != 0) return;
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u32 *freeSpace = exceptionsPage;
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while(freeSpace < exceptionsPage + 0x400 - 0xA && (freeSpace[0] != 0xFFFFFFFF || freeSpace[1] != 0xFFFFFFFF))
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freeSpace++;
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if(freeSpace >= exceptionsPage + 0x400 - 0xA) return;
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//Official implementation of svcBackdoor
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freeSpace[0] = 0xE3CD10FF; //bic r1, sp, #0xff
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freeSpace[1] = 0xE3811C0F; //orr r1, r1, #0xf00
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freeSpace[2] = 0xE2811028; //add r1, r1, #0x28
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freeSpace[3] = 0xE5912000; //ldr r2, [r1]
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freeSpace[4] = 0xE9226000; //stmdb r2!, {sp, lr}
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freeSpace[5] = 0xE1A0D002; //mov sp, r2
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freeSpace[6] = 0xE12FFF30; //blx r0
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freeSpace[7] = 0xE8BD0003; //pop {r0, r1}
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freeSpace[8] = 0xE1A0D000; //mov sp, r0
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freeSpace[9] = 0xE12FFF11; //bx r1
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svcTable[0x7B] = 0xFFFF0000 + ((u8 *)freeSpace - (u8 *) exceptionsPage);
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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 patchLegacyFirm(u32 firmType)
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{
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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((u8 *)firm + section[3].offset, 0);
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firm->arm9Entry = (u8 *)0x801301C;
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}
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const patchData twlPatches[] = {
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{{0x1650C0, 0x165D64}, {{ 6, 0x00, 0x20, 0x4E, 0xB0, 0x70, 0xBD }}, 0},
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{{0x173A0E, 0x17474A}, { .type1 = 0x2001 }, 1},
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{{0x174802, 0x17553E}, { .type1 = 0x2000 }, 2},
|
|
{{0x174964, 0x1756A0}, { .type1 = 0x2000 }, 2},
|
|
{{0x174D52, 0x175A8E}, { .type1 = 0x2001 }, 2},
|
|
{{0x174D5E, 0x175A9A}, { .type1 = 0x2001 }, 2},
|
|
{{0x174D6A, 0x175AA6}, { .type1 = 0x2001 }, 2},
|
|
{{0x174E56, 0x175B92}, { .type1 = 0x2001 }, 1},
|
|
{{0x174E58, 0x175B94}, { .type1 = 0x4770 }, 1}
|
|
},
|
|
agbPatches[] = {
|
|
{{0x9D2A8, 0x9DF64}, {{ 6, 0x00, 0x20, 0x4E, 0xB0, 0x70, 0xBD }}, 0},
|
|
{{0xD7A12, 0xD8B8A}, { .type1 = 0xEF26 }, 1}
|
|
};
|
|
|
|
/* Calculate the amount of patches to apply. Only count the boot screen patch for AGB_FIRM
|
|
if the matching option was enabled (keep it as last) */
|
|
u32 numPatches = firmType == 1 ? (sizeof(twlPatches) / sizeof(patchData)) :
|
|
(sizeof(agbPatches) / sizeof(patchData) - !CONFIG(7));
|
|
const patchData *patches = firmType == 1 ? twlPatches : agbPatches;
|
|
|
|
//Patch
|
|
for(u32 i = 0; i < numPatches; i++)
|
|
{
|
|
switch(patches[i].type)
|
|
{
|
|
case 0:
|
|
memcpy((u8 *)firm + patches[i].offset[console], patches[i].patch.type0 + 1, patches[i].patch.type0[0]);
|
|
break;
|
|
case 2:
|
|
*(u16 *)((u8 *)firm + patches[i].offset[console] + 2) = 0;
|
|
case 1:
|
|
*(u16 *)((u8 *)firm + patches[i].offset[console]) = patches[i].patch.type1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void patchSafeFirm(void)
|
|
{
|
|
u8 *arm9Section = (u8 *)firm + section[2].offset;
|
|
|
|
if(console)
|
|
{
|
|
//Decrypt ARM9Bin and patch ARM9 entrypoint to skip arm9loader
|
|
arm9Loader(arm9Section, 0);
|
|
firm->arm9Entry = (u8 *)0x801B01C;
|
|
}
|
|
|
|
//Apply FIRM0/1 writes patches to protect A9LH
|
|
patchFirmWrites(arm9Section, console);
|
|
}
|
|
|
|
static void patchFirmWrites(u8 *arm9Section, u32 mode)
|
|
{
|
|
if(mode)
|
|
{
|
|
u16 *writeOffset = getFirmWrite(arm9Section, section[2].size);
|
|
*writeOffset = writeBlock[0];
|
|
*(writeOffset + 1) = writeBlock[1];
|
|
}
|
|
else
|
|
{
|
|
u16 *writeOffset = getFirmWriteSafe(arm9Section, section[2].size);
|
|
*writeOffset = writeBlockSafe[0];
|
|
*(writeOffset + 1) = writeBlockSafe[1];
|
|
}
|
|
}
|
|
|
|
static inline void launchFirm(u32 firstSectionToCopy, u32 bootType)
|
|
{
|
|
//Copy FIRM sections to respective memory locations
|
|
for(u32 i = firstSectionToCopy; i < 4 && section[i].size; i++)
|
|
memcpy(section[i].address, (u8 *)firm + section[i].offset, section[i].size);
|
|
|
|
while(chronoWhenSplashLoaded && chrono() - chronoWhenSplashLoaded < 3 * TICKS_PER_SEC);
|
|
stopChrono();
|
|
|
|
//Determine the ARM11 entry to use
|
|
vu32 *arm11;
|
|
if(bootType) arm11 = (u32 *)0x1FFFFFFC;
|
|
else
|
|
{
|
|
deinitScreens();
|
|
arm11 = (u32 *)0x1FFFFFF8;
|
|
}
|
|
|
|
//Set ARM11 kernel entrypoint
|
|
*arm11 = (u32)firm->arm11Entry;
|
|
|
|
//Final jump to ARM9 kernel
|
|
((void (*)())firm->arm9Entry)();
|
|
}
|