[PATCH v3 12/59] x86/entry: Align SYM_CODE_START() variants

Peter Zijlstra
2022-09-15T11:42:44Z

From: Thomas Gleixner <tglx@linutronix.de>

Explicitly align a bunch of commonly called SYM_CODE_START() symbols.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/entry/entry_64.S | 12 ++++++++----
arch/x86/entry/thunk_64.S | 4 ++--
2 files changed, 10 insertions(+), 6 deletions(-)

--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -284,7 +284,8 @@ SYM_FUNC_END(__switch_to_asm)
* r12: kernel thread arg
*/
.pushsection .text, "ax"
-SYM_CODE_START(ret_from_fork)
+ __FUNC_ALIGN
+SYM_CODE_START_NOALIGN(ret_from_fork)
UNWIND_HINT_EMPTY
ANNOTATE_NOENDBR // copy_thread
movq %rax, %rdi
@@ -828,7 +829,8 @@ EXPORT_SYMBOL(asm_load_gs_index)
*
* C calling convention: exc_xen_hypervisor_callback(struct *pt_regs)
*/
-SYM_CODE_START_LOCAL(exc_xen_hypervisor_callback)
+ __FUNC_ALIGN
+SYM_CODE_START_LOCAL_NOALIGN(exc_xen_hypervisor_callback)

/*
* Since we don't modify %rdi, evtchn_do_upall(struct *pt_regs) will
@@ -856,7 +858,8 @@ SYM_CODE_END(exc_xen_hypervisor_callback
* We distinguish between categories by comparing each saved segment register
* with its current contents: any discrepancy means we in category 1.
*/
-SYM_CODE_START(xen_failsafe_callback)
+ __FUNC_ALIGN
+SYM_CODE_START_NOALIGN(xen_failsafe_callback)
UNWIND_HINT_EMPTY
ENDBR
movl %ds, %ecx
@@ -1516,7 +1519,8 @@ SYM_CODE_END(ignore_sysret)
#endif

.pushsection .text, "ax"
-SYM_CODE_START(rewind_stack_and_make_dead)
+ __FUNC_ALIGN
+SYM_CODE_START_NOALIGN(rewind_stack_and_make_dead)
UNWIND_HINT_FUNC
/* Prevent any naive code from trying to unwind to our caller. */
xorl %ebp, %ebp
--- a/arch/x86/entry/thunk_64.S
+++ b/arch/x86/entry/thunk_64.S
@@ -11,7 +11,7 @@

/* rdi: arg1 ... normal C conventions. rax is saved/restored. */
.macro THUNK name, func
-SYM_FUNC_START_NOALIGN(\name)
+SYM_FUNC_START(\name)
pushq %rbp
movq %rsp, %rbp

@@ -36,7 +36,7 @@ SYM_FUNC_END(\name)
EXPORT_SYMBOL(preempt_schedule_thunk)
EXPORT_SYMBOL(preempt_schedule_notrace_thunk)

-SYM_CODE_START_LOCAL_NOALIGN(__thunk_restore)
+SYM_CODE_START_LOCAL(__thunk_restore)
popq %r11
popq %r10
popq %r9