[proxmark3-svn] / bootrom / flash-reset.s

@-----------------------------------------------------------------------------
@ 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	.
Commit	Line	Data
bd20f8f4	1	@-----------------------------------------------------------------------------
	2	@ This code is licensed to you under the terms of the GNU GPL, version 2 or,
	3	@ at your option, any later version. See the LICENSE.txt file for the text of
	4	@ the license.
	5	@-----------------------------------------------------------------------------
	6	@ Reset vector for running from FLASH
	7	@-----------------------------------------------------------------------------
	8
15c4dc5a	9	.section .startup,"ax"
86d31955	10
86d31955	11	.arm
15c4dc5a	12
	13	.global flashstart
	14	flashstart:
86d31955	15	b reset
	16	b undefined_instruction
	17	b software_interrupt
	18	b prefetch_abort
	19	b data_abort
	20	b . @reserved
2c3685c2	21	ldr pc, [pc,#-0xF20] @ IRQ - read the AIC
86d31955	22	b fiq
	23
	24	reset:
	25	ldr sp, =_stack_end @ initialize stack pointer to top of RAM
	26
	27	@ copy bootloader to RAM (in case the user re-flashes the bootloader)
	28	ldr r0, =__bootphase2_src_start__
	29	ldr r1, =__bootphase2_start__
	30	ldr r2, =__bootphase2_end__
	31	1:
	32	ldr r3, [r0], #4
	33	str r3, [r1], #4
	34	cmp r1, r2
	35	blo 1b
	36
	37	ldr r3, =ram_start @ start address of RAM bootloader
	38	bx r3 @ jump to it
	39
	40	.ltorg
	41
	42	undefined_instruction:
	43	b .
	44	software_interrupt:
	45	b .
	46	prefetch_abort:
	47	b .
	48	data_abort:
	49	b .
86d31955	50	fiq:
86d31955	51	b .