[COMMITTED] xtensa: add .note.GNU-stack section on linux

[Max Filippov via Gcc-patches]

gcc/
        * config/xtensa/linux.h (TARGET_ASM_FILE_END): New macro.

libgcc/
        * config/xtensa/crti.S: Add .note.GNU-stack section on linux.
        * config/xtensa/crtn.S: Likewise.
        * config/xtensa/lib1funcs.S: Likewise.
        * config/xtensa/lib2funcs.S: Likewise.
---
 gcc/config/xtensa/linux.h        | 2 ++
 libgcc/config/xtensa/crti.S      | 6 ++++++
 libgcc/config/xtensa/crtn.S      | 6 ++++++
 libgcc/config/xtensa/lib1funcs.S | 6 ++++++
 libgcc/config/xtensa/lib2funcs.S | 6 ++++++
 5 files changed, 26 insertions(+)

diff --git a/gcc/config/xtensa/linux.h b/gcc/config/xtensa/linux.h
index dc4d547fc5fd..e684e7deebf9 100644
--- a/gcc/config/xtensa/linux.h
+++ b/gcc/config/xtensa/linux.h
@@ -69,3 +69,5 @@ along with GCC; see the file COPYING3.  If not see
 #define XTENSA_ALWAYS_PIC 1
 
 #undef DEBUGGER_REGNO
+
+#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
diff --git a/libgcc/config/xtensa/crti.S b/libgcc/config/xtensa/crti.S
index b88df50207b6..637203500c41 100644
--- a/libgcc/config/xtensa/crti.S
+++ b/libgcc/config/xtensa/crti.S
@@ -26,6 +26,12 @@
 
 #include "xtensa-config-builtin.h"
 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
+
        .section .init
        .globl _init
        .type _init,@function
diff --git a/libgcc/config/xtensa/crtn.S b/libgcc/config/xtensa/crtn.S
index 7f271660f942..15c13ea03d0d 100644
--- a/libgcc/config/xtensa/crtn.S
+++ b/libgcc/config/xtensa/crtn.S
@@ -27,6 +27,12 @@
 
 #include "xtensa-config-builtin.h"
 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
+
        .section .init
 #if XCHAL_HAVE_WINDOWED && !__XTENSA_CALL0_ABI__
        retw
diff --git a/libgcc/config/xtensa/lib1funcs.S b/libgcc/config/xtensa/lib1funcs.S
index a3f17b6b2cbc..5baf2df1d20e 100644
--- a/libgcc/config/xtensa/lib1funcs.S
+++ b/libgcc/config/xtensa/lib1funcs.S
@@ -25,6 +25,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If 
not, see
 
 #include "xtensa-config-builtin.h"
 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
+
 /* Define macros for the ABS and ADDX* instructions to handle cases
    where they are not included in the Xtensa processor configuration.  */
 
diff --git a/libgcc/config/xtensa/lib2funcs.S b/libgcc/config/xtensa/lib2funcs.S
index e038e41eb6f1..992f712238c4 100644
--- a/libgcc/config/xtensa/lib2funcs.S
+++ b/libgcc/config/xtensa/lib2funcs.S
@@ -25,6 +25,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If 
not, see
 
 #include "xtensa-config-builtin.h"
 
+/* An executable stack is *not* required for these functions.  */
+#if defined(__ELF__) && defined(__linux__)
+.section .note.GNU-stack,"",%progbits
+.previous
+#endif
+
 /* __xtensa_libgcc_window_spill: This function flushes out all but the
    current register window.  This is used to set up the stack so that
    arbitrary frames can be accessed.  */
-- 
2.30.2