diff options
Diffstat (limited to 'src/backends/x86_64_retval.c')
| -rw-r--r-- | src/backends/x86_64_retval.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/src/backends/x86_64_retval.c b/src/backends/x86_64_retval.c deleted file mode 100644 index b3799ae0..00000000 --- a/src/backends/x86_64_retval.c +++ /dev/null @@ -1,194 +0,0 @@ -/* Function return value location for Linux/x86-64 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 x86_64_ -#include "libebl_CPU.h" - - -/* %rax, or pair %rax, %rdx. */ -static const Dwarf_Op loc_intreg[] = - { - { .atom = DW_OP_reg0 }, { .atom = DW_OP_piece, .number = 8 }, - { .atom = DW_OP_reg1 }, { .atom = DW_OP_piece, .number = 8 }, - }; -#define nloc_intreg 1 -#define nloc_intregpair 4 - -/* %st(0), or pair %st(0), %st(1). */ -static const Dwarf_Op loc_x87reg[] = - { - { .atom = DW_OP_regx, .number = 33 }, - { .atom = DW_OP_piece, .number = 10 }, - { .atom = DW_OP_regx, .number = 34 }, - { .atom = DW_OP_piece, .number = 10 }, - }; -#define nloc_x87reg 1 -#define nloc_x87regpair 4 - -/* %xmm0, or pair %xmm0, %xmm1. */ -static const Dwarf_Op loc_ssereg[] = - { - { .atom = DW_OP_reg17 }, { .atom = DW_OP_piece, .number = 16 }, - { .atom = DW_OP_reg18 }, { .atom = DW_OP_piece, .number = 16 }, - }; -#define nloc_ssereg 1 -#define nloc_sseregpair 4 - -/* 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 %rax. */ -static const Dwarf_Op loc_aggregate[] = - { - { .atom = DW_OP_breg0, .number = 0 } - }; -#define nloc_aggregate 1 - - -int -x86_64_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); - } - /* Fall through. */ - - 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; - - switch (encoding) - { - case DW_ATE_complex_float: - switch (size) - { - case 4 * 2: /* complex float */ - case 8 * 2: /* complex double */ - *locp = loc_ssereg; - return nloc_sseregpair; - case 16 * 2: /* complex long double */ - *locp = loc_x87reg; - return nloc_x87regpair; - } - return -2; - - case DW_ATE_float: - switch (size) - { - case 4: /* float */ - case 8: /* double */ - *locp = loc_ssereg; - return nloc_ssereg; - case 16: /* long double */ - /* XXX distinguish __float128, which is sseregpair?? */ - *locp = loc_x87reg; - return nloc_x87reg; - } - return -2; - } - } - - intreg: - *locp = loc_intreg; - if (size <= 8) - return nloc_intreg; - if (size <= 16) - return nloc_intregpair; - - large: - *locp = loc_aggregate; - return nloc_aggregate; - - case DW_TAG_structure_type: - case DW_TAG_class_type: - case DW_TAG_union_type: - case DW_TAG_array_type: - if (dwarf_aggregate_size (typedie, &size) != 0) - goto large; - if (size > 16) - goto large; - - /* XXX - Must examine the fields in picayune ways to determine the - actual answer. This will be right for small C structs - containing integer types and similarly simple cases. - */ - - goto intreg; - } - - /* 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; -} |