Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/backends/ppc64_retval.c b/backends/ppc64_retval.c
new file mode 100644
index 0000000..eb1c11e
--- /dev/null
+++ b/backends/ppc64_retval.c
@@ -0,0 +1,195 @@
+/* Function return value location for Linux/PPC64 ABI.
+ Copyright (C) 2005-2010, 2014 Red Hat, Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#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
+
+/* vr2. */
+static const Dwarf_Op loc_vmxreg[] =
+ {
+ { .atom = DW_OP_regx, .number = 1124 + 2 }
+ };
+#define nloc_vmxreg 1
+
+/* 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_Die die_mem, *typedie = &die_mem;
+ int tag = dwarf_peeled_die_type (functypedie, typedie);
+ if (tag <= 0)
+ return tag;
+
+ Dwarf_Word size;
+ switch (tag)
+ {
+ case -1:
+ return -1;
+
+ case DW_TAG_subrange_type:
+ if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
+ {
+ Dwarf_Attribute attr_mem, *attr;
+ attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+ typedie = dwarf_formref_die (attr, &die_mem);
+ tag = DWARF_TAG_OR_RETURN (typedie);
+ }
+ FALLTHROUGH;
+
+ case DW_TAG_base_type:
+ case DW_TAG_enumeration_type:
+ case DW_TAG_pointer_type:
+ case DW_TAG_ptr_to_member_type:
+ {
+ Dwarf_Attribute attr_mem;
+ if (dwarf_formudata (dwarf_attr_integrate (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_Attribute attr_mem;
+ Dwarf_Word encoding;
+ if (dwarf_formudata (dwarf_attr_integrate (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;
+ }
+
+ FALLTHROUGH;
+ 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_array_type:
+ {
+ Dwarf_Attribute attr_mem;
+ bool is_vector;
+ if (dwarf_formflag (dwarf_attr_integrate (typedie, DW_AT_GNU_vector,
+ &attr_mem), &is_vector) == 0
+ && is_vector)
+ {
+ *locp = loc_vmxreg;
+ return nloc_vmxreg;
+ }
+ }
+ FALLTHROUGH;
+
+ case DW_TAG_string_type:
+ if (dwarf_aggregate_size (typedie, &size) == 0 && size <= 8)
+ {
+ if (tag == DW_TAG_array_type)
+ {
+ /* Check if it's a character array. */
+ Dwarf_Attribute attr_mem, *attr;
+ attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+ typedie = dwarf_formref_die (attr, &die_mem);
+ tag = DWARF_TAG_OR_RETURN (typedie);
+ if (tag != DW_TAG_base_type)
+ goto aggregate;
+ if (dwarf_formudata (dwarf_attr_integrate (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;
+}