x86: Disable stack protector for naked functions

Since naked functions should not enable stack protector, define
TARGET_STACK_PROTECT_RUNTIME_ENABLED_P to disable stack protector
for naked functions.

gcc/

	PR target/116962
	* config/i386/i386.cc (ix86_stack_protect_runtime_enabled_p): New
	function.
	(TARGET_STACK_PROTECT_RUNTIME_ENABLED_P): New.

gcc/testsuite/

	PR target/116962
	* gcc.target/i386/pr116962.c: New file.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 7d2845da112214f064e7b24531cc67e256b5177e)

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 882de00610ffed850608a28ecc7515b1c83c8f3f..2087f8633eb8066bd829b6190091854efc6bf632 100644 (file)
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -22644,6 +22644,13 @@ ix86_stack_protect_guard (void)
   return default_stack_protect_guard ();
 }
 
+static bool
+ix86_stack_protect_runtime_enabled_p (void)
+{
+  /* Naked functions should not enable stack protector.  */
+  return !ix86_function_naked (current_function_decl);
+}
+
 /* For 32-bit code we can save PIC register setup by using
    __stack_chk_fail_local hidden function instead of calling
    __stack_chk_fail directly.  64-bit code doesn't need to setup any PIC
@@ -24650,6 +24657,10 @@ ix86_libgcc_floating_mode_supported_p
 #undef TARGET_STACK_PROTECT_GUARD
 #define TARGET_STACK_PROTECT_GUARD ix86_stack_protect_guard
 
+#undef TARGET_STACK_PROTECT_RUNTIME_ENABLED_P
+#define TARGET_STACK_PROTECT_RUNTIME_ENABLED_P \
+  ix86_stack_protect_runtime_enabled_p
+
 #if !TARGET_MACHO
 #undef TARGET_STACK_PROTECT_FAIL
 #define TARGET_STACK_PROTECT_FAIL ix86_stack_protect_fail

diff --git a/gcc/testsuite/gcc.target/i386/pr116962.c b/gcc/testsuite/gcc.target/i386/pr116962.c
new file mode 100644 (file)
index 0000000..ced16ee
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr116962.c
@@ -0,0 +1,10 @@
+/* { dg-do compile { target fstack_protector } } */
+/* { dg-options "-O2 -fstack-protector-all" } */
+/* { dg-final { scan-assembler-not "__stack_chk_fail" } } */
+
+__attribute__ ((naked))
+void
+foo (void)
+{
+  asm ("ret");
+}