Fix broken implementation of NOEXECSTACK flag for MIPS architectures for gcc-linaro-4.8

This patch ensures that libgcc_s.so properly honours the NOEXECSTACK flag
for MIPS builds, when gcc-linaro-4.8 or 4.9 is the chosen C compiler.

Signed-off-by: Andrew McDonnell <bugs@andrewmcdonnell.net>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42769 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 235 insertions, 0 deletions

diff --git a/toolchain/gcc/patches/4.8-linaro/930-fix-mips-noexecstack.patch b/toolchain/gcc/patches/4.8-linaro/930-fix-mips-noexecstack.patch
new file mode 100644
index 0000000000..e1f1a896b9
--- /dev/null
+++ b/toolchain/gcc/patches/4.8-linaro/930-fix-mips-noexecstack.patch
@@ -0,0 +1,124 @@
+From da45b3fde60095756f5f6030f6012c23a3d34429 Mon Sep 17 00:00:00 2001
+From: Andrew McDonnell <bugs@andrewmcdonnell.net>
+Date: Fri, 3 Oct 2014 19:09:00 +0930
+Subject: Add .note.GNU-stack section
+
+See http://lists.busybox.net/pipermail/uclibc/2014-October/048671.html
+Below copied from https://gcc.gnu.org/ml/gcc-patches/2014-09/msg02430.html
+
+Re: [Patch, MIPS] Add .note.GNU-stack section
+
+    From: Steve Ellcey <sellcey at mips dot com>
+
+On Wed, 2014-09-10 at 10:15 -0700, Eric Christopher wrote:
+>
+>
+> On Wed, Sep 10, 2014 at 9:27 AM, <pinskia@gmail.com> wrote:
+
+>         This works except you did not update the assembly files in
+>         libgcc or glibc. We (Cavium) have the same patch in our tree
+>         for a few released versions.
+
+> Mind just checking yours in then Andrew?
+
+> Thanks!
+> -eric
+
+I talked to Andrew about what files he changed in GCC and created and
+tested this new patch.  Andrew also mentioned changing some assembly
+files in glibc but I don't see any use of '.section .note.GNU-stack' in
+any assembly files in glibc (for any platform) so I wasn't planning on
+creating a glibc to add them to mips glibc assembly language files.
+
+OK to check in this patch?
+
+Steve Ellcey
+sellcey@mips.com
+
+
+
+2014-09-26  Steve Ellcey  <sellcey@mips.com>
+---
+ gcc/config/mips/mips.c          | 3 +++
+ libgcc/config/mips/crti.S       | 4 ++++
+ libgcc/config/mips/crtn.S       | 3 +++
+ libgcc/config/mips/mips16.S     | 4 ++++
+ libgcc/config/mips/vr4120-div.S | 4 ++++
+ 5 files changed, 18 insertions(+)
+
+diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
+index 41c5d6b..33d9793 100644
+--- a/gcc/config/mips/mips.c
++++ b/gcc/config/mips/mips.c
+@@ -18223,6 +18223,9 @@ mips_expand_vec_minmax (rtx target, rtx op0, rtx op1,
+ #undef TARGET_VECTORIZE_VEC_PERM_CONST_OK
+ #define TARGET_VECTORIZE_VEC_PERM_CONST_OK mips_vectorize_vec_perm_const_ok
+ 
++#undef TARGET_ASM_FILE_END
++#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
++
+ struct gcc_target targetm = TARGET_INITIALIZER;
+ 
+ #include "gt-mips.h"
+diff --git a/libgcc/config/mips/crti.S b/libgcc/config/mips/crti.S
+index c7418db..e5f2762 100644
+--- a/libgcc/config/mips/crti.S
++++ b/libgcc/config/mips/crti.S
+@@ -21,6 +21,10 @@ 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.  */
++	.section .note.GNU-stack,"",%progbits
++
+ /* 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 59d1a90..5cc03bf 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.  */
++	.section .note.GNU-stack,"",%progbits
++
+ /* 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/mips16.S b/libgcc/config/mips/mips16.S
+index ab3a794..4ded5da 100644
+--- a/libgcc/config/mips/mips16.S
++++ b/libgcc/config/mips/mips16.S
+@@ -27,6 +27,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+    values using the soft-float calling convention, but do the actual
+    operation using the hard floating point instructions.  */
+ 
++/* An executable stack is *not* required for these functions.  */
++	.section .note.GNU-stack,"",%progbits
++	.previous
++
+ #if defined _MIPS_SIM && (_MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIO64)
+ 
+ /* This file contains 32-bit assembly code.  */
+diff --git a/libgcc/config/mips/vr4120-div.S b/libgcc/config/mips/vr4120-div.S
+index 6e9242a..1e260cd 100644
+--- a/libgcc/config/mips/vr4120-div.S
++++ b/libgcc/config/mips/vr4120-div.S
+@@ -26,6 +26,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+    -mfix-vr4120.  div and ddiv do not give the correct result when one
+    of the operands is negative.  */
+ 
++/* An executable stack is *not* required for these functions.  */
++	.section .note.GNU-stack,"",%progbits
++	.previous
++
+ 	.set	nomips16
+ 
+ #define DIV								\
+-- 
+1.9.1
+
diff --git a/toolchain/gcc/patches/4.9-linaro/930-fix-mips-noexecstack.patch b/toolchain/gcc/patches/4.9-linaro/930-fix-mips-noexecstack.patch
new file mode 100644
index 0000000000..72bacc1320
--- /dev/null
+++ b/toolchain/gcc/patches/4.9-linaro/930-fix-mips-noexecstack.patch
@@ -0,0 +1,111 @@
+From da45b3fde60095756f5f6030f6012c23a3d34429 Mon Sep 17 00:00:00 2001
+From: Andrew McDonnell <bugs@andrewmcdonnell.net>
+Date: Fri, 3 Oct 2014 19:09:00 +0930
+Subject: Add .note.GNU-stack section
+
+See http://lists.busybox.net/pipermail/uclibc/2014-October/048671.html
+Below copied from https://gcc.gnu.org/ml/gcc-patches/2014-09/msg02430.html
+
+Re: [Patch, MIPS] Add .note.GNU-stack section
+
+    From: Steve Ellcey <sellcey at mips dot com>
+
+On Wed, 2014-09-10 at 10:15 -0700, Eric Christopher wrote:
+>
+>
+> On Wed, Sep 10, 2014 at 9:27 AM, <pinskia@gmail.com> wrote:
+
+>         This works except you did not update the assembly files in
+>         libgcc or glibc. We (Cavium) have the same patch in our tree
+>         for a few released versions.
+
+> Mind just checking yours in then Andrew?
+
+> Thanks!
+> -eric
+
+I talked to Andrew about what files he changed in GCC and created and
+tested this new patch.  Andrew also mentioned changing some assembly
+files in glibc but I don't see any use of '.section .note.GNU-stack' in
+any assembly files in glibc (for any platform) so I wasn't planning on
+creating a glibc to add them to mips glibc assembly language files.
+
+OK to check in this patch?
+
+Steve Ellcey
+sellcey@mips.com
+
+
+
+2014-09-26  Steve Ellcey  <sellcey@mips.com>
+---
+ gcc/config/mips/mips.c          | 3 +++
+ libgcc/config/mips/crti.S       | 4 ++++
+ libgcc/config/mips/crtn.S       | 3 +++
+ libgcc/config/mips/mips16.S     | 4 ++++
+ libgcc/config/mips/vr4120-div.S | 4 ++++
+ 5 files changed, 18 insertions(+)
+
+--- a/gcc/config/mips/mips.c
++++ b/gcc/config/mips/mips.c
+@@ -19134,6 +19134,9 @@ mips_atomic_assign_expand_fenv (tree *ho
+ #undef TARGET_ATOMIC_ASSIGN_EXPAND_FENV
+ #define TARGET_ATOMIC_ASSIGN_EXPAND_FENV mips_atomic_assign_expand_fenv
+ 
++#undef TARGET_ASM_FILE_END
++#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
++
+ struct gcc_target targetm = TARGET_INITIALIZER;
+ 
+ #include "gt-mips.h"
+--- a/libgcc/config/mips/crti.S
++++ b/libgcc/config/mips/crti.S
+@@ -21,6 +21,10 @@ a copy of the GCC Runtime Library Except
+ 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.  */
++	.section .note.GNU-stack,"",%progbits
++
+ /* 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.  */
+ 
+--- a/libgcc/config/mips/crtn.S
++++ b/libgcc/config/mips/crtn.S
+@@ -21,6 +21,9 @@ a copy of the GCC Runtime Library Except
+ 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.  */
++	.section .note.GNU-stack,"",%progbits
++
+ /* 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.  */
+ 
+--- a/libgcc/config/mips/mips16.S
++++ b/libgcc/config/mips/mips16.S
+@@ -31,6 +31,10 @@ see the files COPYING3 and COPYING.RUNTI
+    values using the soft-float calling convention, but do the actual
+    operation using the hard floating point instructions.  */
+ 
++/* An executable stack is *not* required for these functions.  */
++	.section .note.GNU-stack,"",%progbits
++	.previous
++
+ #if defined _MIPS_SIM && (_MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIO64)
+ 
+ /* This file contains 32-bit assembly code.  */
+--- a/libgcc/config/mips/vr4120-div.S
++++ b/libgcc/config/mips/vr4120-div.S
+@@ -26,6 +26,10 @@ see the files COPYING3 and COPYING.RUNTI
+    -mfix-vr4120.  div and ddiv do not give the correct result when one
+    of the operands is negative.  */
+ 
++/* An executable stack is *not* required for these functions.  */
++	.section .note.GNU-stack,"",%progbits
++	.previous
++
+ 	.set	nomips16
+ 
+ #define DIV								\