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arm64: Seed the stack at stage_entry 

Seed the stack in order to avoid boot process from complaining false stack
overflow.

BUG=chrome-os-partner:30824
BRANCH=None
TEST=Compiles successfully for rush and stack overflow error fixed in boot flow

Change-Id: I5d29d24eb5270d38a35a32171881b1aab8bf32e5
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 26e53568e82ad8418c20c2410f0cbc5c444c9917
Original-Change-Id: Ie51e1bcd263e3b886feb2e0e9c7d544f23c3444e
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/210594
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/8942
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Furquan Shaikh 2014-07-30 18:56:52 -07:00 committed by Patrick Georgi
parent eb5e588259
commit e8ab775c81
1 changed files with 26 additions and 3 deletions
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29
src/arch/arm64/stage_entry.S
View File

@ -20,6 +20,29 @@
#include <arch/asm.h> #include <arch/asm.h>
ENTRY(seed_stack)
/*
* Initialize the stack to a known value. This is used to check for
* stack overflow later in the boot process.
*/
ldr x0, .stack_bottom
ldr x1, .stack_top
ldr x2, =0xdeadbeefdeadbeef
ldr x3, =0x8
init_stack_loop:
str x2, [x0]
add x0, x0, x3
cmp x0, x1
bne init_stack_loop
load_stack:
b arm64_init
.align 4
.stack_bottom:
.quad _stack
ENDPROC(seed_stack)
ENTRY(arm64_el3_startup) ENTRY(arm64_el3_startup)
/* Set all bits in SCTLR_EL3 to 0 except RES1 and RES0 */ /* Set all bits in SCTLR_EL3 to 0 except RES1 and RES0 */
mrs x0, SCTLR_EL3 mrs x0, SCTLR_EL3
@ -37,7 +60,7 @@ ENTRY(arm64_el3_startup)
isb isb
/* Load up the stack if non-zero. */ /* Load up the stack if non-zero. */
ldr x0, .stack ldr x0, .stack_top
cmp x0, #0 cmp x0, #0
b.eq 1f b.eq 1f
mov sp, x0 mov sp, x0
@ -58,10 +81,10 @@ ENTRY(arm64_el3_startup)
* to the Kconfig option for cpu0. However, this code can be relocated * to the Kconfig option for cpu0. However, this code can be relocated
* and reused to start up secondary cpus. * and reused to start up secondary cpus.
*/ */
.stack: .stack_top:
.quad _estack .quad _estack
.entry: .entry:
.quad arm64_init .quad seed_stack
ENDPROC(arm64_el3_startup) ENDPROC(arm64_el3_startup)
.global arm64_el3_startup_end .global arm64_el3_startup_end
arm64_el3_startup_end: arm64_el3_startup_end: