proxmark3/bootrom/flash-reset.s

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@-----------------------------------------------------------------------------
@ This code is licensed to you under the terms of the GNU GPL, version 2 or,
@ at your option, any later version. See the LICENSE.txt file for the text of
@ the license.
@-----------------------------------------------------------------------------
@ Reset vector for running from FLASH
@-----------------------------------------------------------------------------
.section .startup,"ax"
.arm
.global flashstart
flashstart:
b reset
b undefined_instruction
b software_interrupt
b prefetch_abort
b data_abort
b . @reserved
ldr pc, [pc,#-0xF20] @ IRQ - read the AIC
b fiq
reset:
ldr sp, =_stack_end @ initialize stack pointer to top of RAM
@ copy bootloader to RAM (in case the user re-flashes the bootloader)
ldr r0, =__bootphase2_src_start__
ldr r1, =__bootphase2_start__
ldr r2, =__bootphase2_end__
1:
ldr r3, [r0], #4
str r3, [r1], #4
cmp r1, r2
blo 1b
ldr r3, =ram_start @ start address of RAM bootloader
bx r3 @ jump to it
.ltorg
undefined_instruction:
b .
software_interrupt:
b .
prefetch_abort:
b .
data_abort:
b .
fiq:
b .