116 lines
2.8 KiB
ArmAsm
116 lines
2.8 KiB
ArmAsm
|
/*
|
||
|
|
* This file is part of the libpayload project.
|
||
|
|
*
|
||
|
|
* Copyright 2013 Google Inc.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. The name of the author may not be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
exception_stack:
|
||
|
|
.align 5
|
||
|
|
.skip 0x2000, 0xa5
|
||
|
|
exception_stack_end:
|
||
|
|
.word exception_stack_end
|
||
|
|
|
||
|
|
exception_handler:
|
||
|
|
.word 0
|
||
|
|
|
||
|
|
|
||
|
|
.align 6
|
||
|
|
.arm
|
||
|
|
.global exception_table
|
||
|
|
exception_table:
|
||
|
|
b 1f
|
||
|
|
b 2f
|
||
|
|
b 3f
|
||
|
|
b 4f
|
||
|
|
b 5f
|
||
|
|
b 6f
|
||
|
|
b 7f
|
||
|
|
b 8f
|
||
|
|
|
||
|
|
1:
|
||
|
|
ldr sp, _not_used
|
||
|
|
b exception_common
|
||
|
|
2:
|
||
|
|
ldr sp, _undefined_instruction
|
||
|
|
b exception_common
|
||
|
|
3:
|
||
|
|
ldr sp, _software_interrupt
|
||
|
|
b exception_common
|
||
|
|
4:
|
||
|
|
ldr sp, _prefetch_abort
|
||
|
|
b exception_common
|
||
|
|
5:
|
||
|
|
ldr sp, _data_abort
|
||
|
|
b exception_common
|
||
|
|
6:
|
||
|
|
ldr sp, _not_used
|
||
|
|
b exception_common
|
||
|
|
7:
|
||
|
|
ldr sp, _irq
|
||
|
|
b exception_common
|
||
|
|
8:
|
||
|
|
ldr sp, _fiq
|
||
|
|
b exception_common
|
||
|
|
|
||
|
|
exception_common:
|
||
|
|
str sp, exception_handler
|
||
|
|
ldr sp, exception_stack_end
|
||
|
|
push { lr }
|
||
|
|
sub sp, sp, $8
|
||
|
|
push { r0 - r12 }
|
||
|
|
mov r0, sp
|
||
|
|
mov lr, pc
|
||
|
|
ldr pc, exception_handler
|
||
|
|
pop { r0 - r12 }
|
||
|
|
add sp, sp, $8
|
||
|
|
ldm sp!, { pc }^
|
||
|
|
|
||
|
|
|
||
|
|
_undefined_instruction: .word exception_undefined_instruction
|
||
|
|
_software_interrupt: .word exception_software_interrupt
|
||
|
|
_prefetch_abort: .word exception_prefetch_abort
|
||
|
|
_data_abort: .word exception_data_abort
|
||
|
|
_not_used: .word exception_not_used
|
||
|
|
_irq: .word exception_irq
|
||
|
|
_fiq: .word exception_fiq
|
||
|
|
|
||
|
|
.thumb
|
||
|
|
.global set_vbar
|
||
|
|
.thumb_func
|
||
|
|
set_vbar:
|
||
|
|
mcr p15, 0, r0, c12, c0, 0
|
||
|
|
bx lr
|
||
|
|
|
||
|
|
.global exception_test
|
||
|
|
.thumb_func
|
||
|
|
exception_test:
|
||
|
|
mov r1, $1
|
||
|
|
mov r0, pc
|
||
|
|
add r0, $3
|
||
|
|
ldr r1, [r1]
|
||
|
|
bx lr
|
||
|
|
|