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-rw-r--r--src/arch/x86/c_start.S7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/arch/x86/c_start.S b/src/arch/x86/c_start.S
index 3fbdac11b3..86147ecdc7 100644
--- a/src/arch/x86/c_start.S
+++ b/src/arch/x86/c_start.S
@@ -19,9 +19,11 @@
.global _stack
.global _estack
+/* Stack alignment is not enforced with rmodule loader, reserve one
+ * extra CPU such that alignment can be enforced on entry. */
.align CONFIG_STACK_SIZE
_stack:
-.space CONFIG_MAX_CPUS*CONFIG_STACK_SIZE
+.space (CONFIG_MAX_CPUS+1)*CONFIG_STACK_SIZE
_estack:
#if IS_ENABLED(CONFIG_COOP_MULTITASKING)
.global thread_stacks
@@ -70,8 +72,9 @@ _start:
rep
stosl
- /* set new stack */
+ /* Set new stack with enforced alignment. */
movl $_estack, %esp
+ andl $(~(CONFIG_STACK_SIZE-1)), %esp
#if IS_ENABLED(CONFIG_COOP_MULTITASKING)
/* Push the thread pointer. */