From 36e170203e7f09f6c23c7378f835e21c402b57c9 Mon Sep 17 00:00:00 2001
From: Venkataramanan Kumar <venkataramanan.kumar@linaro.org>
Date: Wed, 23 Apr 2014 17:01:39 +0000
Subject: [PATCH] [AARCH64] Use standard patterns for stack protection.

From-SVN: r209712
---
 gcc/ChangeLog                 |  6 ++++
 gcc/config/aarch64/aarch64.md | 63 +++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 724fa3b8589..638c0da2d29 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2014-04-23 Venkataramanan Kumar  <venkataramanan.kumar@linaro.org>
+
+	* config/aarch64/aarch64.md (stack_protect_set, stack_protect_test)
+	(stack_protect_set_<mode>, stack_protect_test_<mode>): Add
+	machine descriptions for Stack Smashing Protector.
+
 2014-04-23  Richard Earnshaw  <rearnsha@arm.com>
 
 	* aarch64.md (<optab>_rol<mode>3): New pattern.
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 1c017e7d6b6..7965db4c9c7 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -103,6 +103,8 @@
     UNSPEC_USHL_2S
     UNSPEC_USHR64
     UNSPEC_VSTRUCTDUMMY
+    UNSPEC_SP_SET
+    UNSPEC_SP_TEST
 ])
 
 (define_c_enum "unspecv" [
@@ -3800,6 +3802,67 @@
   DONE;
 })
 
+;; Named patterns for stack smashing protection.
+(define_expand "stack_protect_set"
+  [(match_operand 0 "memory_operand")
+   (match_operand 1 "memory_operand")]
+  ""
+{
+  enum machine_mode mode = GET_MODE (operands[0]);
+
+  emit_insn ((mode == DImode
+	      ? gen_stack_protect_set_di
+	      : gen_stack_protect_set_si) (operands[0], operands[1]));
+  DONE;
+})
+
+(define_insn "stack_protect_set_<mode>"
+  [(set (match_operand:PTR 0 "memory_operand" "=m")
+	(unspec:PTR [(match_operand:PTR 1 "memory_operand" "m")]
+	 UNSPEC_SP_SET))
+   (set (match_scratch:PTR 2 "=&r") (const_int 0))]
+  ""
+  "ldr\\t%x2, %1\;str\\t%x2, %0\;mov\t%x2,0"
+  [(set_attr "length" "12")
+   (set_attr "type" "multiple")])
+
+(define_expand "stack_protect_test"
+  [(match_operand 0 "memory_operand")
+   (match_operand 1 "memory_operand")
+   (match_operand 2)]
+  ""
+{
+
+  rtx result = gen_reg_rtx (Pmode);
+
+  enum machine_mode mode = GET_MODE (operands[0]);
+
+  emit_insn ((mode == DImode
+	      ? gen_stack_protect_test_di
+	      : gen_stack_protect_test_si) (result,
+					    operands[0],
+					    operands[1]));
+
+  if (mode == DImode)
+    emit_jump_insn (gen_cbranchdi4 (gen_rtx_EQ (VOIDmode, result, const0_rtx),
+				    result, const0_rtx, operands[2]));
+  else
+    emit_jump_insn (gen_cbranchsi4 (gen_rtx_EQ (VOIDmode, result, const0_rtx),
+				    result, const0_rtx, operands[2]));
+  DONE;
+})
+
+(define_insn "stack_protect_test_<mode>"
+  [(set (match_operand:PTR 0 "register_operand")
+	(unspec:PTR [(match_operand:PTR 1 "memory_operand" "m")
+		     (match_operand:PTR 2 "memory_operand" "m")]
+	 UNSPEC_SP_TEST))
+   (clobber (match_scratch:PTR 3 "=&r"))]
+  ""
+  "ldr\t%x3, %x1\;ldr\t%x0, %x2\;eor\t%x0, %x3, %x0"
+  [(set_attr "length" "12")
+   (set_attr "type" "multiple")])
+
 ;; AdvSIMD Stuff
 (include "aarch64-simd.md")
 
-- 
2.30.2