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arm64: Initialize exception stack

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Initialize the exception stack on stage_entry

BUG=chrome-os-partner:31515
BRANCH=None
TEST=Exception handling works fine

Change-Id: I0b6fb95c660c68fb47a30e905acb910b0e2eafea
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/213673
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
This commit is contained in:
Furquan Shaikh 2014-08-21 12:52:06 -07:00 • committed by chrome-internal-fetch
commit a21d0a432e
1 changed files with 12 additions and 0 deletions
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12
src/arch/arm64/stage_entry.S
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@ -55,6 +55,16 @@ ENTRY(arm64_el3_startup)
and x0, x0, x1
msr SCR_EL3, x0
/* Initialize SP_EL3 as exception stack */
ldr x0, .exception_stack_top
cmp x0, #0
b.eq 2f
msr SPSel, #1
isb
mov sp, x0
2:
/* Have stack pointer use SP_EL0. */
msr SPSel, #0
isb
@ -81,6 +91,8 @@ ENTRY(arm64_el3_startup)
* to the Kconfig option for cpu0. However, this code can be relocated
* and reused to start up secondary cpus.
*/
.exception_stack_top:
.quad CONFIG_EXCEPTION_STACK_TOP
.stack_top:
.quad _estack
.entry: