[PATCH 19/33] x86/asm/efi: Create a stack frame in efi_call()

[Josh Poimboeuf]

efi_call() is a callable non-leaf function which doesn't honor
CONFIG_FRAME_POINTER, which can result in bad stack traces.

Create a stack frame for it when CONFIG_FRAME_POINTER is enabled.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Reviewed-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
---
 arch/x86/platform/efi/efi_stub_64.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/platform/efi/efi_stub_64.S b/arch/x86/platform/efi/efi_stub_64.S
index 32020cb..92723ae 100644
--- a/arch/x86/platform/efi/efi_stub_64.S
+++ b/arch/x86/platform/efi/efi_stub_64.S
@@ -11,6 +11,7 @@
 #include <asm/msr.h>
 #include <asm/processor-flags.h>
 #include <asm/page_types.h>
+#include <asm/frame.h>
 
 #define SAVE_XMM			\
 	mov %rsp, %rax;			\
@@ -39,6 +40,7 @@
 	mov (%rsp), %rsp
 
 ENTRY(efi_call)
+	FRAME_BEGIN
 	SAVE_XMM
 	mov (%rsp), %rax
 	mov 8(%rax), %rax
@@ -51,5 +53,6 @@ ENTRY(efi_call)
 	call *%rdi
 	addq $48, %rsp
 	RESTORE_XMM
+	FRAME_END
 	ret
 ENDPROC(efi_call)
-- 
2.4.3