configure.ac [spu-*-*]: Do not set skipdirs.

ChangeLog:

2008-10-29  Stefan Schulze Frielinghaus  <xxschulz@de.ibm.com>

	* configure.ac [spu-*-*]: Do not set skipdirs.
	* configure: Re-generate.

gcc/ChangeLog:

2008-10-29  Stefan Schulze Frielinghaus  <xxschulz@de.ibm.com>

	* config/spu/spu.h (FRAME_GROWS_DOWNWARD): Define.
	(INITIAL_FRAME_POINTER_OFFSET): Remove.
	* config/spu/spu.c (spu_initial_elimination_offset): Calculate new
	offset if eliminating soft frame pointer.
	* config/spu/spu.md (stack_protect_set, stack_protect_test)
	(stack_protect_test_si): Add initial machine description
	for Stack Smashing Protector

From-SVN: r141437

4 files changed, 72 insertions, 12 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dc5ab3b..bf3467d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2008-10-29  Stefan Schulze Frielinghaus  <xxschulz@de.ibm.com>
+
+	* config/spu/spu.h (FRAME_GROWS_DOWNWARD): Define.
+	(INITIAL_FRAME_POINTER_OFFSET): Remove.
+	* config/spu/spu.c (spu_initial_elimination_offset): Calculate new
+	offset if eliminating soft frame pointer.
+	* config/spu/spu.md (stack_protect_set, stack_protect_test)
+	(stack_protect_test_si): Add initial machine description
+	for Stack Smashing Protector
+
 2008-10-29  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	PR 11492
diff --git a/gcc/config/spu/spu.c b/gcc/config/spu/spu.c
index e3781d5..cd7f6ed 100644
--- a/gcc/config/spu/spu.c
+++ b/gcc/config/spu/spu.c
@@ -1759,8 +1759,8 @@ direct_return (void)
    The stack frame looks like this:
          +-------------+
          |  incoming   | 
-      AP |    args     | 
-         +-------------+
+         |    args     | 
+   AP -> +-------------+
          | $lr save    |
          +-------------+
  prev SP | back chain  | 
@@ -1770,10 +1770,10 @@ direct_return (void)
          +-------------+
          |    ...      | 
          | saved regs  | spu_saved_regs_size() bytes
-         +-------------+
+   FP -> +-------------+
          |    ...      | 
-      FP |   vars      | get_frame_size()  bytes
-         +-------------+
+         |   vars      | get_frame_size()  bytes
+  HFP -> +-------------+
          |    ...      | 
          |  outgoing   | 
          |    args     | crtl->outgoing_args_size bytes
@@ -1781,8 +1781,8 @@ direct_return (void)
          | $lr of next |
          |   frame     | 
          +-------------+
-      SP | back chain  | 
-         +-------------+
+         | back chain  | 
+   SP -> +-------------+
 
 */
 void
@@ -3671,15 +3671,16 @@ spu_initial_elimination_offset (int from, int to)
       || get_frame_size () || saved_regs_size)
     sp_offset = STACK_POINTER_OFFSET;
   if (from == FRAME_POINTER_REGNUM && to == STACK_POINTER_REGNUM)
-    return (sp_offset + crtl->outgoing_args_size);
+    return get_frame_size () + crtl->outgoing_args_size + sp_offset;
   else if (from == FRAME_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM)
-    return 0;
+    return get_frame_size ();
   else if (from == ARG_POINTER_REGNUM && to == STACK_POINTER_REGNUM)
     return sp_offset + crtl->outgoing_args_size
       + get_frame_size () + saved_regs_size + STACK_POINTER_OFFSET;
   else if (from == ARG_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM)
     return get_frame_size () + saved_regs_size + sp_offset;
-  return 0;
+  else
+    gcc_unreachable ();
 }
 
 rtx
diff --git a/gcc/config/spu/spu.h b/gcc/config/spu/spu.h
index 4789c10..f93a0e6 100644
--- a/gcc/config/spu/spu.h
+++ b/gcc/config/spu/spu.h
@@ -251,6 +251,8 @@ targetm.resolve_overloaded_builtin = spu_resolve_overloaded_builtin;	\
 
 #define STACK_GROWS_DOWNWARD
 
+#define FRAME_GROWS_DOWNWARD 1
+
 #define STARTING_FRAME_OFFSET (0)
 
 #define STACK_POINTER_OFFSET 32
@@ -312,8 +314,6 @@ targetm.resolve_overloaded_builtin = spu_resolve_overloaded_builtin;	\
 
 #define FRAME_POINTER_REQUIRED 0
 
-#define INITIAL_FRAME_POINTER_OFFSET(DEPTH) ((DEPTH) = 0)
-
 #define ELIMINABLE_REGS  \
   {{ARG_POINTER_REGNUM,	 STACK_POINTER_REGNUM},				\
   {ARG_POINTER_REGNUM,	 HARD_FRAME_POINTER_REGNUM},			\
diff --git a/gcc/config/spu/spu.md b/gcc/config/spu/spu.md
index d1fa6f0..e7b48f5 100644
--- a/gcc/config/spu/spu.md
+++ b/gcc/config/spu/spu.md
@@ -155,6 +155,8 @@
  (UNSPEC_DFTSV		 51)
  (UNSPEC_FLOAT_EXTEND	 52)
  (UNSPEC_FLOAT_TRUNCATE	 53)
+ (UNSPEC_SP_SET         54)
+ (UNSPEC_SP_TEST        55) 
 ])
 
 (include "predicates.md")
@@ -5188,4 +5190,51 @@ DONE;
   DONE;
 }")
 
+(define_insn "stack_protect_set"
+  [(set (match_operand:SI 0 "spu_mem_operand" "=m")
+        (unspec:SI [(match_operand:SI 1 "spu_mem_operand" "m")] UNSPEC_SP_SET))
+   (set (match_scratch:SI 2 "=&r") (const_int 0))]
+  ""
+  "lq%p1\t%2,%1\;stq%p0\t%2,%0\;xor\t%2,%2,%2"
+  [(set_attr "length" "12")
+   (set_attr "type" "multi1")]
+)
+
+(define_expand "stack_protect_test"
+  [(match_operand 0 "spu_mem_operand" "")
+   (match_operand 1 "spu_mem_operand" "")
+   (match_operand 2 "" "")]
+  ""
+{
+  rtx compare_result;
+  rtx bcomp, loc_ref;
+
+  compare_result = gen_reg_rtx (SImode);
+
+  emit_insn (gen_stack_protect_test_si (compare_result,
+                                        operands[0],
+                                        operands[1]));
+
+  bcomp = gen_rtx_NE (SImode, compare_result, const0_rtx);
+
+  loc_ref = gen_rtx_LABEL_REF (VOIDmode, operands[2]);
+
+  emit_jump_insn (gen_rtx_SET (VOIDmode, pc_rtx,
+                                   gen_rtx_IF_THEN_ELSE (VOIDmode, bcomp,
+                                                         loc_ref, pc_rtx)));
+
+  DONE;
+})
+
+(define_insn "stack_protect_test_si"
+  [(set (match_operand:SI 0 "spu_reg_operand" "=&r")
+        (unspec:SI [(match_operand:SI 1 "spu_mem_operand" "m")
+                    (match_operand:SI 2 "spu_mem_operand" "m")]
+                   UNSPEC_SP_TEST))
+   (set (match_scratch:SI 3 "=&r") (const_int 0))]
+  ""
+  "lq%p1\t%0,%1\;lq%p2\t%3,%2\;ceq\t%0,%0,%3\;xor\t%3,%3,%3"
+  [(set_attr "length" "16")
+   (set_attr "type" "multi1")]
+)