[PATCH 1/2][MIPS] Emit .note.GNU-stack for soft-float linux targets.

[Dragan Mladjenovic]

From: "Dragan Mladjenovic" <dmladjenovic@wavecomp.com>

gcc/ChangeLog:

2019-08-05  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>

	* config/mips/linux.h (NEED_INDICATE_EXEC_STACK): Define to
	TARGET_SOFT_FLOAT.
	* config/mips/mips.c (TARGET_ASM_FILE_END): Define to ...
	(mips_asm_file_end): New function. Delegate to
	file_end_indicate_exec_stack if NEED_INDICATE_EXEC_STACK is true.
	* config/mips/mips.h (NEED_INDICATE_EXEC_STACK): Define to 0.

libgcc/ChangeLog:

2019-08-05  Dragan Mladjenovic  <dmladjenovic@wavecomp.com>

	* config/mips/gnustack.h: New file.
	* config/mips/crti.S: Include gnustack.h.
	* config/mips/crtn.S: Likewise.
	* config/mips/mips16.S: Likewise.
	* config/mips/vr4120-div.S: Likewise.
---
 gcc/config/mips/linux.h         |  4 ++++
 gcc/config/mips/mips.c          | 11 +++++++++++
 gcc/config/mips/mips.h          |  2 ++
 libgcc/config/mips/crti.S       |  3 +++
 libgcc/config/mips/crtn.S       |  3 +++
 libgcc/config/mips/gnustack.h   |  7 +++++++
 libgcc/config/mips/mips16.S     |  3 +++
 libgcc/config/mips/vr4120-div.S |  3 +++
 8 files changed, 36 insertions(+)
 create mode 100644 libgcc/config/mips/gnustack.h

diff --git a/gcc/config/mips/linux.h b/gcc/config/mips/linux.h
index 6f79ac9..1fa72ef 100644
--- a/gcc/config/mips/linux.h
+++ b/gcc/config/mips/linux.h
@@ -50,3 +50,7 @@ along with GCC; see the file COPYING3.  If not see
 #define GNU_USER_DYNAMIC_LINKERN32 \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERN32, UCLIBC_DYNAMIC_LINKERN32, \
                          BIONIC_DYNAMIC_LINKERN32, MUSL_DYNAMIC_LINKERN32)
+
+#undef NEED_INDICATE_EXEC_STACK
+
+#define NEED_INDICATE_EXEC_STACK TARGET_SOFT_FLOAT
diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
index e0535b1..66ef23a 100644
--- a/gcc/config/mips/mips.c
+++ b/gcc/config/mips/mips.c
@@ -22522,6 +22522,13 @@ mips_starting_frame_offset (void)
     return 0;
   return crtl->outgoing_args_size + MIPS_GP_SAVE_AREA_SIZE;
 }
+
+static void
+mips_asm_file_end (void)
+{
+  if (NEED_INDICATE_EXEC_STACK)
+    file_end_indicate_exec_stack ();
+}
 

 /* Initialize the GCC target structure.  */
 #undef TARGET_ASM_ALIGNED_HI_OP
@@ -22829,6 +22836,10 @@ mips_starting_frame_offset (void)
 #undef TARGET_STARTING_FRAME_OFFSET
 #define TARGET_STARTING_FRAME_OFFSET mips_starting_frame_offset
 
+#undef TARGET_ASM_FILE_END
+#define TARGET_ASM_FILE_END mips_asm_file_end
+
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 

 #include "gt-mips.h"
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index a5be7fa3..22a1b3c 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -3461,3 +3461,5 @@ struct GTY(())  machine_function {
   (TARGET_LOAD_STORE_PAIRS \
    && (TUNE_P5600 || TUNE_I6400 || TUNE_P6600) \
    && !TARGET_MICROMIPS && !TARGET_FIX_24K)
+
+#define NEED_INDICATE_EXEC_STACK 0
diff --git a/libgcc/config/mips/crti.S b/libgcc/config/mips/crti.S
index 44409c7..8733415 100644
--- a/libgcc/config/mips/crti.S
+++ b/libgcc/config/mips/crti.S
@@ -21,6 +21,9 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+/* An executable stack is *not* required for these functions.  */
+#include "gnustack.h"
+
 /* 4 slots for argument spill area.  1 for cpreturn, 1 for stack.
    Return spill offset of 40 and 20.  Aligned to 16 bytes for n32.  */
 
diff --git a/libgcc/config/mips/crtn.S b/libgcc/config/mips/crtn.S
index b56d77c..f897906 100644
--- a/libgcc/config/mips/crtn.S
+++ b/libgcc/config/mips/crtn.S
@@ -21,6 +21,9 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+/* An executable stack is *not* required for these functions.  */
+#include "gnustack.h"
+
 /* 4 slots for argument spill area.  1 for cpreturn, 1 for stack.
    Return spill offset of 40 and 20.  Aligned to 16 bytes for n32.  */
 
diff --git a/libgcc/config/mips/gnustack.h b/libgcc/config/mips/gnustack.h
new file mode 100644
index 0000000..6d5f618
--- /dev/null
+++ b/libgcc/config/mips/gnustack.h
@@ -0,0 +1,7 @@
+#include "config.h"
+#if defined(__ELF__) && defined(__linux__)
+#if defined (__mips_soft_float)
+        .section .note.GNU-stack,"",%progbits
+        .previous
+#endif
+#endif
diff --git a/libgcc/config/mips/mips16.S b/libgcc/config/mips/mips16.S
index 8cfd9e4..1f4df43 100644
--- a/libgcc/config/mips/mips16.S
+++ b/libgcc/config/mips/mips16.S
@@ -21,6 +21,9 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+/* An executable stack is *not* required for these functions.  */
+#include "gnustack.h"
+
 #include "auto-host.h"
 
 #if defined(__mips_micromips) || defined(__mips_soft_float) \
diff --git a/libgcc/config/mips/vr4120-div.S b/libgcc/config/mips/vr4120-div.S
index 7f6729d..783b59e 100644
--- a/libgcc/config/mips/vr4120-div.S
+++ b/libgcc/config/mips/vr4120-div.S
@@ -22,6 +22,9 @@ a copy of the GCC Runtime Library Exception along with this program;
 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 <http://www.gnu.org/licenses/>.  */
 
+/* An executable stack is *not* required for these functions.  */
+#include "gnustack.h"
+
 /* This file contains functions which implement divsi3 and modsi3 for
    -mfix-vr4120.  div and ddiv do not give the correct result when one
    of the operands is negative.  */
-- 
1.9.1