137 lines
3.9 KiB
ArmAsm
137 lines
3.9 KiB
ArmAsm
/*
|
|
* This file is part of the libpayload project.
|
|
*
|
|
* Copyright 2014 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.
|
|
*/
|
|
|
|
#define __ASSEMBLY__
|
|
#include <arch/lib_helpers.h>
|
|
|
|
.text
|
|
|
|
/* Macro for exception entry
|
|
* Store x30 before any branch
|
|
* Branch to exception_prologue to save rest of the registers
|
|
* Move exception id into x1
|
|
* Branch to exception_handler
|
|
*/
|
|
.macro eentry lbl id
|
|
.align 7
|
|
\lbl:
|
|
stp x30, xzr, [sp, #-16]!
|
|
bl exception_prologue
|
|
mov x1, \id
|
|
bl exception_handler
|
|
.endm
|
|
|
|
/* Exception table has 16 entries and each of 128 bytes
|
|
* Hence, 16 * 128 = 2048. Thus, 11 passed as parameter
|
|
* to align
|
|
*/
|
|
|
|
.align 11
|
|
.global exception_table
|
|
exception_table:
|
|
|
|
eentry sync_sp0,#0
|
|
eentry irq_sp0,#1
|
|
eentry fiq_sp0,#2
|
|
eentry serror_sp0,#3
|
|
eentry sync_spx,#4
|
|
eentry irq_spx,#5
|
|
eentry fiq_spx,#6
|
|
eentry serror_spx,#7
|
|
eentry sync_elx_64,#8
|
|
eentry irq_elx_64,#9
|
|
eentry fiq_elx_64,#10
|
|
eentry serror_elx_64,#11
|
|
eentry sync_elx_32,#12
|
|
eentry irq_elx_32,#13
|
|
eentry fiq_elx_32,#14
|
|
eentry serror_elx_32,#15
|
|
|
|
exception_prologue:
|
|
/* Save all registers x0-x29 */
|
|
stp x28, x29, [sp, #-16]!
|
|
stp x26, x27, [sp, #-16]!
|
|
stp x24, x25, [sp, #-16]!
|
|
stp x22, x23, [sp, #-16]!
|
|
stp x20, x21, [sp, #-16]!
|
|
stp x18, x19, [sp, #-16]!
|
|
stp x16, x17, [sp, #-16]!
|
|
stp x14, x15, [sp, #-16]!
|
|
stp x12, x13, [sp, #-16]!
|
|
stp x10, x11, [sp, #-16]!
|
|
stp x8, x9, [sp, #-16]!
|
|
stp x6, x7, [sp, #-16]!
|
|
stp x4, x5, [sp, #-16]!
|
|
stp x2, x3, [sp, #-16]!
|
|
stp x0, x1, [sp, #-16]!
|
|
|
|
/* Save the exception reason on stack */
|
|
read_current x1, esr
|
|
|
|
/* Save the return address on stack */
|
|
read_current x0, elr
|
|
stp x0, x1, [sp, #-16]!
|
|
|
|
ret
|
|
|
|
exception_handler:
|
|
/* Save address of saved registers into x0
|
|
* This acts as first argument to exception_dispatch
|
|
*/
|
|
mov x0, sp
|
|
bl exception_dispatch
|
|
|
|
/* Pop return address saved on stack */
|
|
ldp x0, x1, [sp], #16
|
|
write_current elr, x0, x2
|
|
write_current esr, x1, x2
|
|
/* Pop exception reason saved on stack, followed by regs x0-x30 */
|
|
ldp x0, x1, [sp], #16
|
|
ldp x2, x3, [sp], #16
|
|
ldp x4, x5, [sp], #16
|
|
ldp x6, x7, [sp], #16
|
|
ldp x8, x9, [sp], #16
|
|
ldp x10, x11, [sp], #16
|
|
ldp x12, x13, [sp], #16
|
|
ldp x14, x15, [sp], #16
|
|
ldp x16, x17, [sp], #16
|
|
ldp x18, x19, [sp], #16
|
|
ldp x20, x21, [sp], #16
|
|
ldp x22, x23, [sp], #16
|
|
ldp x24, x25, [sp], #16
|
|
ldp x26, x27, [sp], #16
|
|
ldp x28, x29, [sp], #16
|
|
ldp x30, xzr, [sp], #16
|
|
eret
|
|
|
|
.global set_vbar
|
|
set_vbar:
|
|
write_current vbar, x0, x1
|
|
ret
|