diff options
Diffstat (limited to 'src/arch/x86/c_start.S')
| -rw-r--r-- | src/arch/x86/c_start.S | 7 |
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. */ |