Hi Again,
Le 05/08/2020 à 16:03, Segher Boessenkool a écrit :
Hi!
On Wed, Aug 05, 2020 at 07:09:23AM +0000, Christophe Leroy wrote:
+/*
+ * The macros sets two stack frames, one for the caller and one for the callee
+ * because there are no requirement for the caller to set a stack frame when
+ * calling VDSO so it may have omitted to set one, especially on PPC64
+ */
If the caller follows the ABI, there always is a stack frame. So what
is going on?
Looks like it is not the case. See discussion at
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/2a67c333893454868bbfda773ba4b01c20272a5d.1588079622.git.christophe.leroy@xxxxxx/
Seems like GCC uses the redzone and doesn't set a stack frame. I guess
it doesn't know that the inline assembly contains a function call so it
doesn't set the frame.
Christophe
