1/* AVR-specific support for 32-bit ELF. 2 Copyright (C) 2006-2024 Free Software Foundation, Inc. 3 4 Written by Bjoern Haase <bjoern.m.haase@web.de> 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, 21 Boston, MA 02110-1301, USA. */ 22 23 24/* These four functions will be called from the ld back-end. */ 25 26extern void 27elf32_avr_setup_params (struct bfd_link_info *, bfd *, asection *, 28 bool, bool, bool, bfd_vma, bool); 29 30extern int 31elf32_avr_setup_section_lists (bfd *, struct bfd_link_info *); 32 33extern bool 34elf32_avr_size_stubs (bfd *, struct bfd_link_info *, bool); 35 36extern bool 37elf32_avr_build_stubs (struct bfd_link_info *); 38 39/* The name of the section into which the property records are stored. */ 40#define AVR_PROPERTY_RECORD_SECTION_NAME ".avr.prop" 41 42/* The current version number for the format of the property records. */ 43#define AVR_PROPERTY_RECORDS_VERSION 1 44 45/* The size of the header that is written to the property record section 46 before the property records are written out. */ 47#define AVR_PROPERTY_SECTION_HEADER_SIZE 4 48 49/* This holds a single property record in memory, the structure of this 50 data when written out to the ELF section is more compressed. */ 51 52struct avr_property_record 53{ 54 /* The section and offset for this record. */ 55 asection *section; 56 bfd_vma offset; 57 58 /* The type of this record. */ 59 enum { 60 RECORD_ORG = 0, 61 RECORD_ORG_AND_FILL = 1, 62 RECORD_ALIGN = 2, 63 RECORD_ALIGN_AND_FILL = 3 64 } type; 65 66 /* Type specific data. */ 67 union 68 { 69 /* RECORD_ORG and RECORD_ORG_AND_FILL. */ 70 struct 71 { 72 unsigned long fill; 73 } org; 74 75 /* RECORD_ALIGN and RECORD_ALIGN_AND_FILL. */ 76 struct 77 { 78 unsigned long bytes; 79 unsigned long fill; 80 81 /* This field is used during linker relaxation to track the number of 82 bytes that have been opened up before this alignment directive. 83 When we have enough bytes available it is possible to move the 84 re-align this directive backwards while still maintaining the 85 alignment requirement. */ 86 unsigned long preceding_deleted; 87 } align; 88 } data; 89}; 90 91struct avr_property_record_list 92{ 93 /* The version number tells us the structure of the property record data 94 within the section. See AVR_PROPERTY_RECORDS_VERSION. */ 95 bfd_byte version; 96 97 /* The flags field is currently unused. This should be set to 0. */ 98 bfd_byte flags; 99 100 /* The number of property records. This is stored as a 2-byte value in 101 the section contents. */ 102 unsigned long record_count; 103 104 /* The section from which the property records were loaded. This is the 105 actual section containing the records, not the section(s) to which the 106 records apply. */ 107 asection *section; 108 109 /* The actual property records. */ 110 struct avr_property_record *records; 111}; 112 113/* Load the property records from ABFD, return NULL if there are non 114 found, otherwise return pointer to dynamically allocated memory. The 115 memory for the header and all of the records are allocated in a single 116 block, as such only the header needs to be freed. */ 117 118extern struct avr_property_record_list *avr_elf32_load_property_records (bfd *abfd); 119 120/* Return a string that is the name of the property record pointed to by REC. */ 121extern const char *avr_elf32_property_record_name (struct avr_property_record *rec); 122