arm.c (arm_get_frame_offsets): Set offsets->locals_base to avoid negative stack size.

gcc/ChangeLog:

2007-06-19  Seongbae Park  <seongbae.park@gmail.com>

	* config/arm/arm.c (arm_get_frame_offsets): Set
	offsets->locals_base to avoid negative stack size.
	(thumb1_expand_prologue): Assert on negative stack size.

gcc/testsuite/ChangeLog:

2007-06-19  Seongbae Park  <seongbae.park@gmail.com>

	* gcc.target/arm/stack-corruption.c: New test.

From-SVN: r125856

gcc/ChangeLog

+2007-06-19  Seongbae Park  <seongbae.park@gmail.com>
+
+	* config/arm/arm.c (arm_get_frame_offsets): Set
+	offsets->locals_base to avoid negative stack size.
+	(thumb1_expand_prologue): Assert on negative stack size.
+
 2007-04-11  Sebastian Pop  <sebpop@gmail.com>
 
 	PR tree-optimization/32367

gcc/config/arm/arm.c

@@ -11101,6 +11101,7 @@ arm_get_frame_offsets (void)
   if (leaf && frame_size == 0)
     {
       offsets->outgoing_args = offsets->soft_frame;
+      offsets->locals_base = offsets->soft_frame;
       return offsets;
     }
 
@@ -14662,6 +14663,7 @@ thumb1_expand_epilogue (void)
       amount = offsets->locals_base - offsets->saved_regs;
     }
 
+  gcc_assert (amount >= 0);
   if (amount)
     {
       if (amount < 512)

gcc/testsuite/ChangeLog

+2007-06-19  Seongbae Park  <seongbae.park@gmail.com>
+
+	* gcc.target/arm/stack-corruption.c: New test.
+
 2007-06-19  Richard Guenther  <rguenther@suse.de>
 
 	* g++.dg/torture/pr30252.C: New testcase.

gcc/testsuite/gcc.target/arm/stack-corruption.c

+/* { dg-do compile } */
+/* { dg-options "-O -mthumb -fno-omit-frame-pointer" } */
+
+int main() {
+  return 0;
+}
+
+/* { dg-final { scan-assembler-not "\tadd\tr7, sp, #8\n" } } */