Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 1 | /* Function return value location for Linux/SH ABI. |
Petr Machata | ba9e515 | 2014-06-20 22:59:43 +0200 | [diff] [blame] | 2 | Copyright (C) 2010, 2014 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 3 | This file is part of elfutils. |
Ulrich Drepper | 7880556 | 2010-04-13 13:11:14 -0700 | [diff] [blame] | 4 | Contributed by Matt Fleming <matt@console-pimps.org>. |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 5 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 8 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
| 25 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <assert.h> |
| 35 | #include <dwarf.h> |
| 36 | |
| 37 | #define BACKEND sh_ |
| 38 | #include "libebl_CPU.h" |
| 39 | |
| 40 | |
| 41 | /* This is the SVR4 ELF ABI convention, but AIX and Linux do not use it. */ |
| 42 | #define SVR4_STRUCT_RETURN 0 |
| 43 | |
| 44 | |
| 45 | /* r0, or pair r0, r1. */ |
| 46 | static const Dwarf_Op loc_intreg[] = |
| 47 | { |
| 48 | { .atom = DW_OP_reg0 }, { .atom = DW_OP_piece, .number = 4 }, |
| 49 | { .atom = DW_OP_reg1 }, { .atom = DW_OP_piece, .number = 4 }, |
| 50 | }; |
| 51 | #define nloc_intreg 1 |
| 52 | #define nloc_intregpair 4 |
| 53 | |
| 54 | /* fr0 or fr1. */ |
| 55 | static const Dwarf_Op loc_fpreg[] = |
| 56 | { |
| 57 | { .atom = DW_OP_reg25 }, { .atom = DW_OP_piece, .number = 4 }, |
| 58 | { .atom = DW_OP_reg26 }, { .atom = DW_OP_piece, .number = 4 }, |
| 59 | }; |
| 60 | #define nloc_fpreg 1 |
| 61 | #define nloc_fpregpair 2 |
| 62 | |
| 63 | int |
| 64 | sh_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp) |
| 65 | { |
| 66 | /* Start with the function's type, and get the DW_AT_type attribute, |
| 67 | which is the type of the return value. */ |
Petr Machata | ba9e515 | 2014-06-20 22:59:43 +0200 | [diff] [blame] | 68 | Dwarf_Die die_mem, *typedie = &die_mem; |
| 69 | int tag = dwarf_peeled_die_type (functypedie, typedie); |
| 70 | if (tag <= 0) |
| 71 | return tag; |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 72 | |
| 73 | Dwarf_Word size; |
| 74 | switch (tag) |
| 75 | { |
| 76 | case -1: |
| 77 | return -1; |
| 78 | |
| 79 | case DW_TAG_subrange_type: |
| 80 | if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size)) |
| 81 | { |
Petr Machata | ba9e515 | 2014-06-20 22:59:43 +0200 | [diff] [blame] | 82 | Dwarf_Attribute attr_mem, *attr; |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 83 | attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem); |
| 84 | typedie = dwarf_formref_die (attr, &die_mem); |
Mark Wielaard | 1d5037f | 2013-02-06 13:15:10 +0100 | [diff] [blame] | 85 | tag = DWARF_TAG_OR_RETURN (typedie); |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 86 | } |
| 87 | /* Fall through. */ |
| 88 | |
| 89 | case DW_TAG_base_type: |
| 90 | case DW_TAG_enumeration_type: |
| 91 | case DW_TAG_pointer_type: |
| 92 | case DW_TAG_ptr_to_member_type: |
Petr Machata | ba9e515 | 2014-06-20 22:59:43 +0200 | [diff] [blame] | 93 | { |
| 94 | Dwarf_Attribute attr_mem; |
| 95 | if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size, |
| 96 | &attr_mem), &size) != 0) |
| 97 | { |
| 98 | if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type) |
| 99 | size = 4; |
| 100 | else |
| 101 | return -1; |
| 102 | } |
| 103 | } |
| 104 | |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 105 | if (size <= 8) |
| 106 | { |
| 107 | if (tag == DW_TAG_base_type) |
| 108 | { |
Petr Machata | ba9e515 | 2014-06-20 22:59:43 +0200 | [diff] [blame] | 109 | Dwarf_Attribute attr_mem; |
Matt Fleming | d80f0b2 | 2010-04-10 19:13:37 -0700 | [diff] [blame] | 110 | Dwarf_Word encoding; |
| 111 | if (dwarf_formudata (dwarf_attr_integrate (typedie, |
| 112 | DW_AT_encoding, |
| 113 | &attr_mem), |
| 114 | &encoding) != 0) |
| 115 | return -1; |
| 116 | if (encoding == DW_ATE_float) |
| 117 | { |
| 118 | *locp = loc_fpreg; |
| 119 | return size <= 4 ? nloc_fpreg : nloc_fpregpair; |
| 120 | } |
| 121 | } |
| 122 | *locp = loc_intreg; |
| 123 | return size <= 4 ? nloc_intreg : nloc_intregpair; |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /* XXX We don't have a good way to return specific errors from ebl calls. |
| 128 | This value means we do not understand the type, but it is well-formed |
| 129 | DWARF and might be valid. */ |
| 130 | return -2; |
| 131 | } |