Update new test after merge.

1 files changed, 168 insertions, 0 deletions

diff --git a/backends/ppc64_retval.c b/backends/ppc64_retval.c
new file mode 100644
index 00000000..81852915
--- /dev/null
+++ b/backends/ppc64_retval.c
@@ -0,0 +1,168 @@
+/* Function return value location for Linux/PPC64 ABI.
+   Copyright (C) 2005 Red Hat, Inc.
+
+   This program is Open Source software; you can redistribute it and/or
+   modify it under the terms of the Open Software License version 1.0 as
+   published by the Open Source Initiative.
+
+   You should have received a copy of the Open Software License along
+   with this program; if not, you may obtain a copy of the Open Software
+   License version 1.0 from http://www.opensource.org/licenses/osl.php or
+   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
+   3001 King Ranch Road, Ukiah, CA 95482.   */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+
+#define BACKEND ppc64_
+#include "libebl_CPU.h"
+
+
+/* r3.  */
+static const Dwarf_Op loc_intreg[] =
+  {
+    { .atom = DW_OP_reg3 }
+  };
+#define nloc_intreg	1
+
+/* f1, or f1:f2, or f1:f4.  */
+static const Dwarf_Op loc_fpreg[] =
+  {
+    { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_regx, .number = 36 }, { .atom = DW_OP_piece, .number = 8 },
+  };
+#define nloc_fpreg	1
+#define nloc_fp2regs	4
+#define nloc_fp4regs	8
+
+/* The return value is a structure and is actually stored in stack space
+   passed in a hidden argument by the caller.  But, the compiler
+   helpfully returns the address of that space in r3.  */
+static const Dwarf_Op loc_aggregate[] =
+  {
+    { .atom = DW_OP_breg3, .number = 0 }
+  };
+#define nloc_aggregate 1
+
+int
+ppc64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
+{
+  /* Start with the function's type, and get the DW_AT_type attribute,
+     which is the type of the return value.  */
+
+  Dwarf_Attribute attr_mem;
+  Dwarf_Attribute *attr = dwarf_attr (functypedie, DW_AT_type, &attr_mem);
+  if (attr == NULL)
+    /* The function has no return value, like a `void' function in C.  */
+    return 0;
+
+  Dwarf_Die die_mem;
+  Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
+  int tag = dwarf_tag (typedie);
+
+  /* Follow typedefs and qualifiers to get to the actual type.  */
+  while (tag == DW_TAG_typedef
+	 || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
+	 || tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
+    {
+      attr = dwarf_attr (typedie, DW_AT_type, &attr_mem);
+      typedie = dwarf_formref_die (attr, &die_mem);
+      tag = dwarf_tag (typedie);
+    }
+
+  Dwarf_Word size;
+  switch (tag)
+    {
+    case -1:
+      return -1;
+
+    case DW_TAG_subrange_type:
+      if (! dwarf_hasattr (typedie, DW_AT_byte_size))
+	{
+	  attr = dwarf_attr (typedie, DW_AT_type, &attr_mem);
+	  typedie = dwarf_formref_die (attr, &die_mem);
+	  tag = dwarf_tag (typedie);
+	}
+      /* Fall through.  */
+
+    case DW_TAG_base_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_pointer_type:
+    case DW_TAG_ptr_to_member_type:
+      if (dwarf_formudata (dwarf_attr (typedie, DW_AT_byte_size,
+				       &attr_mem), &size) != 0)
+	{
+	  if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
+	    size = 8;
+	  else
+	    return -1;
+	}
+      if (tag == DW_TAG_base_type)
+	{
+	  Dwarf_Word encoding;
+	  if (dwarf_formudata (dwarf_attr (typedie, DW_AT_encoding,
+					   &attr_mem), &encoding) != 0)
+	    return -1;
+
+	  if (encoding == DW_ATE_float || encoding == DW_ATE_complex_float)
+	    {
+	      *locp = loc_fpreg;
+	      if (size <= 8)
+		return nloc_fpreg;
+	      if (size <= 16)
+		return nloc_fp2regs;
+	      if (size <= 32)
+		return nloc_fp4regs;
+	    }
+	}
+      if (size <= 8)
+	{
+	intreg:
+	  *locp = loc_intreg;
+	  return nloc_intreg;
+	}
+
+      /* Else fall through.  */
+    case DW_TAG_structure_type:
+    case DW_TAG_class_type:
+    case DW_TAG_union_type:
+    aggregate:
+      *locp = loc_aggregate;
+      return nloc_aggregate;
+
+    case DW_TAG_string_type:
+    case DW_TAG_array_type:
+      if (dwarf_formudata (dwarf_attr (typedie, DW_AT_byte_size,
+				       &attr_mem), &size) == 0
+	  && size <= 8)
+	{
+	  if (tag == DW_TAG_array_type)
+	    {
+	      /* Check if it's a character array.  */
+	      attr = dwarf_attr (typedie, DW_AT_type, &attr_mem);
+	      typedie = dwarf_formref_die (attr, &die_mem);
+	      tag = dwarf_tag (typedie);
+	      if (tag != DW_TAG_base_type)
+		goto aggregate;
+	      if (dwarf_formudata (dwarf_attr (typedie, DW_AT_byte_size,
+					       &attr_mem), &size) != 0)
+		return -1;
+	      if (size != 1)
+		goto aggregate;
+	    }
+	  goto intreg;
+	}
+      goto aggregate;
+    }
+
+  /* XXX We don't have a good way to return specific errors from ebl calls.
+     This value means we do not understand the type, but it is well-formed
+     DWARF and might be valid.  */
+  return -2;
+}