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-rw-r--r--src/arch/arm64/stage_entry.S29
1 files changed, 26 insertions, 3 deletions
diff --git a/src/arch/arm64/stage_entry.S b/src/arch/arm64/stage_entry.S
index 0f49c40e2d..c18c9cfeaa 100644
--- a/src/arch/arm64/stage_entry.S
+++ b/src/arch/arm64/stage_entry.S
@@ -20,6 +20,29 @@
#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)
/* Set all bits in SCTLR_EL3 to 0 except RES1 and RES0 */
mrs x0, SCTLR_EL3
@@ -37,7 +60,7 @@ ENTRY(arm64_el3_startup)
isb
/* Load up the stack if non-zero. */
- ldr x0, .stack
+ ldr x0, .stack_top
cmp x0, #0
b.eq 1f
mov sp, x0
@@ -58,10 +81,10 @@ ENTRY(arm64_el3_startup)
* to the Kconfig option for cpu0. However, this code can be relocated
* and reused to start up secondary cpus.
*/
- .stack:
+ .stack_top:
.quad _estack
.entry:
- .quad arm64_init
+ .quad seed_stack
ENDPROC(arm64_el3_startup)
.global arm64_el3_startup_end
arm64_el3_startup_end: