c-common.c (enum attrs): Add A_NO_LIMIT_STACK.

* c-common.c (enum attrs): Add A_NO_LIMIT_STACK.
(init_attributes): Add A_NO_LIMIT_STACK.
(decl_attributes): Handle A_NO_LIMIT_STACK.
* c-decl.c (duplicate_decls): Handle DECL_NO_LIMIT_STACK.
* explow.c (allocate_dynamic_stack_space) [!HAVE_allocate_stack]:
Handle stack bounds checking.
* flags.h (flag_stack_check): Use the word 'probe' rather than
'check', because the flag doesn't actually cause any checking to
be done.
* function.c (expand_function_start): Set
current_function_limit_stack.
* function.h (struct function): Add limit_stack.
(current_function_limit_stack): Define.
* invoke.texi (Code Gen Options): Document new options.
* rtl.h: Declare stack_limit_rtx.
* toplev.c (stack_limit_rtx): New variable.
(decode_f_option): Handle new options -fstack-limit-register=REG,
-fstack-limit-symbol=IDENT, -fno-stack-limit.
(main): Add stack_limit_rtx as GC root.
* tree.h (DECL_NO_LIMIT_STACK): New macro.
(struct tree_decl): New member no_limit_stack.

* config/rs6000/rs6000.c (rs6000_allocate_stack_space): Handle
stack_limit_rtx.
* config/rs6000/rs6000.md (allocate_stack): Handle stack_limit_rtx.
(conditional_trap+1): Get new mnemonic correct.
(conditional_trap+2): New pattern for DImode traps.

* config/m68k/m68k.c (output_function_prologue): Handle
stack_limit_rtx.
* config/m68k/m68k.md (trap): New insn.
(conditional_trap): New insn.
* md.texi (Standard Names): Document `trap' and
`conditional_trap'.
* optabs.c (gen_cond_trap): Use start_sequence()/end_sequence()
so a cc0 setter doesn't get emitted at some random place in the
function.

* config/i960/i960.md (trap): New insn.
(conditional_trap): New expander.
(conditional_trap+1, conditional_trap+2): New insns for signed
and unsigned cases.
* config/i960/i960.c (i960_function_prologue): Use
STARTING_FRAME_OFFSET.  Handle stack_limit_rtx.

Co-Authored-By: Greg McGary <gkm@gnu.org>

From-SVN: r30771

1 files changed, 47 insertions, 0 deletions

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 250c8cd..a8db6d0 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4176,6 +4176,53 @@ rs6000_allocate_stack_space (file, size, copy_r12)
      int copy_r12;
 {
   int neg_size = -size;
+
+  if (current_function_limit_stack)
+    {
+      if (REG_P (stack_limit_rtx)
+	  && REGNO (stack_limit_rtx) > 1 
+	  && REGNO (stack_limit_rtx) <= 31)
+	{
+	  if (size <= 32767)
+	    asm_fprintf (file, "\t{cal %s,%d(%s)|addi %s,%s,%d}\n",
+			 reg_names[0], reg_names[REGNO (stack_limit_rtx)], 
+			 size);
+	  else
+	    {
+	      asm_fprintf (file, "\t{cau|addis} %s,%s,0x%x\n",
+			   reg_names[0], reg_names[REGNO (stack_limit_rtx)], 
+			   ((size + 0x8000) >> 16) & 0xffff);
+	      asm_fprintf (file, "\t{ai|addic} %s,%s,%d\n",
+			   reg_names[0], reg_names[0], 
+			   (size & 0x7fff) | -(size & 0x8000));
+	    }
+	  if (TARGET_32BIT)
+	    asm_fprintf (file, "\t{t|tw}llt %s,%s\n", 
+			 reg_names[1], reg_names[0]);
+	  else
+	    asm_fprintf (file, "\ttdllt %s,%s\n", reg_names[1], reg_names[0]);
+	}
+      else if (GET_CODE (stack_limit_rtx) == SYMBOL_REF
+	       && (DEFAULT_ABI == ABI_V4 || DEFAULT_ABI == ABI_SOLARIS))
+	{
+	  char * l_name = XSTR (stack_limit_rtx, 0);
+	  const char * stripped_name;
+
+	  STRIP_NAME_ENCODING (stripped_name, l_name);
+	  asm_fprintf (file, "\t{liu|lis} %s,%s@ha+%d\n",
+		       reg_names[0], stripped_name, size);
+	  asm_fprintf (file, "\t{ai|addic} %s,%s,%s@l+%d\n",
+		       reg_names[0], reg_names[0], stripped_name, size);
+	  if (TARGET_32BIT)
+	    asm_fprintf (file, "\t{t|tw}llt %s,%s\n", 
+			 reg_names[1], reg_names[0]);
+	  else
+	    asm_fprintf (file, "\ttdllt %s,%s\n", reg_names[1], reg_names[0]);
+	}
+      else
+	warning ("stack limit expression is not supported");
+    }
+
   if (TARGET_UPDATE)
     {
       if (size < 32767)