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367 lines
9.9 KiB
367 lines
9.9 KiB
/* Function return value location for IA64 ABI.
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Copyright (C) 2006-2010, 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <dwarf.h>
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#define BACKEND ia64_
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#include "libebl_CPU.h"
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/* r8, or pair r8, r9, or aggregate up to r8-r11. */
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static const Dwarf_Op loc_intreg[] =
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{
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{ .atom = DW_OP_reg8 }, { .atom = DW_OP_piece, .number = 8 },
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{ .atom = DW_OP_reg9 }, { .atom = DW_OP_piece, .number = 8 },
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{ .atom = DW_OP_reg10 }, { .atom = DW_OP_piece, .number = 8 },
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{ .atom = DW_OP_reg11 }, { .atom = DW_OP_piece, .number = 8 },
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};
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#define nloc_intreg 1
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#define nloc_intregs(n) (2 * (n))
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/* f8, or aggregate up to f8-f15. */
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#define DEFINE_FPREG(size) \
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static const Dwarf_Op loc_fpreg_##size[] = \
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{ \
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{ .atom = DW_OP_regx, .number = 128 + 8 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 9 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 10 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 11 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 12 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 13 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 14 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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{ .atom = DW_OP_regx, .number = 128 + 15 }, \
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{ .atom = DW_OP_piece, .number = size }, \
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}
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#define nloc_fpreg 1
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#define nloc_fpregs(n) (2 * (n))
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DEFINE_FPREG (4);
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DEFINE_FPREG (8);
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DEFINE_FPREG (10);
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#undef DEFINE_FPREG
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/* The return value is a structure and is actually stored in stack space
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passed in a hidden argument by the caller. But, the compiler
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helpfully returns the address of that space in r8. */
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static const Dwarf_Op loc_aggregate[] =
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{
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{ .atom = DW_OP_breg8, .number = 0 }
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};
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#define nloc_aggregate 1
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static inline int
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compute_hfa (const Dwarf_Op *loc, int nregs,
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const Dwarf_Op **locp, int fpregs_used)
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{
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if (fpregs_used == 0)
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*locp = loc;
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else if (*locp != loc)
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return 9;
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return fpregs_used + nregs;
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}
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/* If this type is an HFA small enough to be returned in FP registers,
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return the number of registers to use. Otherwise 9, or -1 for errors. */
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static int
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hfa_type (Dwarf_Die *typedie, Dwarf_Word size,
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const Dwarf_Op **locp, int fpregs_used)
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{
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/* Descend the type structure, counting elements and finding their types.
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If we find a datum that's not an FP type (and not quad FP), punt.
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If we find a datum that's not the same FP type as the first datum, punt.
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If we count more than eight total homogeneous FP data, punt. */
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int tag = DWARF_TAG_OR_RETURN (typedie);
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switch (tag)
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{
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Dwarf_Attribute attr_mem;
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case -1:
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return -1;
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case DW_TAG_base_type:;
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Dwarf_Word encoding;
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if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
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&attr_mem), &encoding) != 0)
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return -1;
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#define hfa(loc, nregs) compute_hfa(loc, nregs, locp, fpregs_used)
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switch (encoding)
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{
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case DW_ATE_float:
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switch (size)
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{
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case 4: /* float */
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return hfa (loc_fpreg_4, 1);
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case 8: /* double */
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return hfa (loc_fpreg_8, 1);
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case 10: /* x86-style long double, not really used */
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return hfa (loc_fpreg_10, 1);
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}
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break;
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case DW_ATE_complex_float:
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switch (size)
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{
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case 4 * 2: /* complex float */
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return hfa (loc_fpreg_4, 2);
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case 8 * 2: /* complex double */
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return hfa (loc_fpreg_8, 2);
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case 10 * 2: /* complex long double (x86-style) */
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return hfa (loc_fpreg_10, 2);
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}
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break;
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}
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break;
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case DW_TAG_structure_type:
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case DW_TAG_class_type:
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case DW_TAG_union_type:;
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Dwarf_Die child_mem;
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switch (dwarf_child (typedie, &child_mem))
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{
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default:
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return -1;
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case 1: /* No children: empty struct. */
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break;
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case 0:; /* Look at each element. */
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int max_used = fpregs_used;
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do
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switch (dwarf_tag (&child_mem))
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{
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case -1:
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return -1;
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case DW_TAG_member:;
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Dwarf_Die child_type_mem;
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Dwarf_Die *child_typedie
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= dwarf_formref_die (dwarf_attr_integrate (&child_mem,
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DW_AT_type,
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&attr_mem),
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&child_type_mem);
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Dwarf_Word child_size;
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if (dwarf_aggregate_size (child_typedie, &child_size) != 0)
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return -1;
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if (tag == DW_TAG_union_type)
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{
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int used = hfa_type (child_typedie, child_size,
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locp, fpregs_used);
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if (used < 0 || used > 8)
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return used;
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if (used > max_used)
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max_used = used;
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}
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else
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{
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fpregs_used = hfa_type (child_typedie, child_size,
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locp, fpregs_used);
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if (fpregs_used < 0 || fpregs_used > 8)
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return fpregs_used;
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}
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}
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while (dwarf_siblingof (&child_mem, &child_mem) == 0);
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if (tag == DW_TAG_union_type)
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fpregs_used = max_used;
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break;
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}
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break;
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case DW_TAG_array_type:
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if (size == 0)
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break;
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Dwarf_Die base_type_mem;
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Dwarf_Die *base_typedie
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= dwarf_formref_die (dwarf_attr_integrate (typedie, DW_AT_type,
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&attr_mem),
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&base_type_mem);
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Dwarf_Word base_size;
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if (dwarf_aggregate_size (base_typedie, &base_size) != 0)
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return -1;
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int used = hfa_type (base_typedie, base_size, locp, 0);
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if (used < 0 || used > 8)
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return used;
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if (size % (*locp)[1].number != 0)
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return 0;
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fpregs_used += used * (size / (*locp)[1].number);
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break;
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default:
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return 9;
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}
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return fpregs_used;
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}
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int
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ia64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
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{
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/* Start with the function's type, and get the DW_AT_type attribute,
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which is the type of the return value. */
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Dwarf_Die die_mem, *typedie = &die_mem;
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int tag = dwarf_peeled_die_type (functypedie, typedie);
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if (tag <= 0)
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return tag;
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Dwarf_Word size;
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switch (tag)
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{
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case -1:
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return -1;
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case DW_TAG_subrange_type:
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if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
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{
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Dwarf_Attribute attr_mem, *attr;
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attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
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typedie = dwarf_formref_die (attr, &die_mem);
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tag = DWARF_TAG_OR_RETURN (typedie);
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}
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FALLTHROUGH;
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case DW_TAG_base_type:
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case DW_TAG_enumeration_type:
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case DW_TAG_pointer_type:
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case DW_TAG_ptr_to_member_type:
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{
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Dwarf_Attribute attr_mem;
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if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
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&attr_mem), &size) != 0)
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{
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if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
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size = 8;
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else
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return -1;
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}
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}
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if (tag == DW_TAG_base_type)
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{
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Dwarf_Attribute attr_mem;
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Dwarf_Word encoding;
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if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
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&attr_mem),
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&encoding) != 0)
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return -1;
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switch (encoding)
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{
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case DW_ATE_float:
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switch (size)
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{
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case 4: /* float */
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*locp = loc_fpreg_4;
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return nloc_fpreg;
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case 8: /* double */
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*locp = loc_fpreg_8;
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return nloc_fpreg;
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case 10: /* x86-style long double, not really used */
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*locp = loc_fpreg_10;
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return nloc_fpreg;
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case 16: /* long double, IEEE quad format */
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*locp = loc_intreg;
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return nloc_intregs (2);
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}
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return -2;
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case DW_ATE_complex_float:
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switch (size)
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{
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case 4 * 2: /* complex float */
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*locp = loc_fpreg_4;
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return nloc_fpregs (2);
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case 8 * 2: /* complex double */
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*locp = loc_fpreg_8;
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return nloc_fpregs (2);
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case 10 * 2: /* complex long double (x86-style) */
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*locp = loc_fpreg_10;
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return nloc_fpregs (2);
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case 16 * 2: /* complex long double (IEEE quad) */
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*locp = loc_intreg;
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return nloc_intregs (4);
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}
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return -2;
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}
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}
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intreg:
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*locp = loc_intreg;
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if (size <= 8)
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return nloc_intreg;
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if (size <= 32)
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return nloc_intregs ((size + 7) / 8);
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large:
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*locp = loc_aggregate;
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return nloc_aggregate;
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case DW_TAG_structure_type:
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case DW_TAG_class_type:
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case DW_TAG_union_type:
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case DW_TAG_array_type:
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if (dwarf_aggregate_size (typedie, &size) != 0)
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return -1;
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/* If this qualifies as an homogeneous floating-point aggregate
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(HFA), then it should be returned in FP regs. */
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int nfpreg = hfa_type (typedie, size, locp, 0);
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if (nfpreg < 0)
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return nfpreg;
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else if (nfpreg > 0 && nfpreg <= 8)
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return nfpreg == 1 ? nloc_fpreg : nloc_fpregs (nfpreg);
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if (size > 32)
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goto large;
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goto intreg;
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}
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/* XXX We don't have a good way to return specific errors from ebl calls.
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This value means we do not understand the type, but it is well-formed
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DWARF and might be valid. */
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return -2;
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}
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