diff options
| -rw-r--r-- | src/arch/arm64/stage_entry.S | 29 |
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: |