1 /* NDS32-specific support for 32-bit ELF.
2 Copyright (C) 2012-2023 Free Software Foundation, Inc.
3 Contributed by Andes Technology Corporation.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA.*/
21
22 #ifndef ELF32_NDS32_H
23 #define ELF32_NDS32_H
24
25 #ifdef __cplusplus
26 extern "C" {
27 #endif
28
29 /* Relocation flags encoded in r_addend. */
30
31 /* Relocation flags for R_NDS32_ERLAX_ENTRY. */
32
33 /* Set if relax on this section is done or disabled. */
34 #define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG (1u << 31)
35 /* Optimize for performance. */
36 #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG (1u << 30)
37 /* Optimize for size. Branch destination 4-byte adjustment
38 may be disabled. */
39 #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG (1u << 29)
40 /* To distinguish the assembly code generated by compiler
41 or written manually. */
42 #define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG (1u << 28)
43 /* Two bits for ICT to comply with files without directive. */
44 /* ICT small model. */
45 #define R_NDS32_RELAX_ENTRY_ICT_SMALL (0x2u << 4)
46 /* ICT large model. */
47 #define R_NDS32_RELAX_ENTRY_ICT_LARGE (0x3u << 4)
48 /* Mask for get ict bits. */
49 #define R_NDS32_RELAX_ENTRY_ICT_MASK (0x3u << 4)
50
51
52 /* Relocation flags for R_NDS32_INSN16. */
53
54 /* Tag the nop16 can be removed. */
55 #define R_NDS32_INSN16_CONVERT_FLAG (1u << 0)
56 /* Convert a gp-relative access (e.g., lwi.gp)
57 to fp-as-gp access (lwi37.fp).
58 This value is used by linker internally only.
59 It's fine to change the vlaue. */
60 #define R_NDS32_INSN16_FP7U2_FLAG (1u << 1)
61
62 /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END. */
63
64 /* OMIT_FP_FLAG marks the region for applying fp-as-gp
65 optimization. */
66 #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG (1u << 0)
67 /* NOT_OMIT_FP_FLAG is set if this region is not worth
68 for fp-as-gp. */
69 #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG (1u << 1)
70 /* A Innermost loop region. Some optimizations is suppressed
71 in this region due to performance drop. */
72 #define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG (1u << 4)
73
74 /* Tag range for LOADSTORE relocation. */
75 enum
76 {
77 NDS32_LOADSTORE_NONE = 0x0,
78 NDS32_LOADSTORE_BYTE = 0x1,
79 NDS32_LOADSTORE_HALF = 0x2,
80 NDS32_LOADSTORE_WORD = 0x4,
81 NDS32_LOADSTORE_FLOAT_S = 0x8,
82 NDS32_LOADSTORE_FLOAT_D = 0x10,
83 NDS32_LOADSTORE_IMM = 0x20
84 };
85
86 struct section_id_list_t
87 {
88 int id;
89 struct section_id_list_t *next;
90 };
91
92 extern struct section_id_list_t *elf32_nds32_lookup_section_id
93 (int, struct section_id_list_t **);
94 extern int elf32_nds32_check_relax_group (bfd *, asection *);
95 extern int elf32_nds32_unify_relax_group (bfd *, asection *);
96 extern int nds32_elf_unify_tls_model (bfd *, asection *, bfd_byte *,
97 struct bfd_link_info *);
98
99 extern int nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
100 extern int nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
101 extern void bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
102 int, int, FILE *,
103 int, int, int);
104
105 #define nds32_elf_hash_table(p) \
106 ((is_elf_hash_table ((p)->hash) \
107 && elf_hash_table_id (elf_hash_table (p)) == NDS32_ELF_DATA) \
108 ? (struct elf_nds32_link_hash_table *) (p)->hash : NULL)
109
110 #define elf32_nds32_compute_jump_table_size(htab) \
111 ((htab)->next_tls_desc_index * 4)
112
113 #define elf32_nds32_local_tlsdesc_gotent(bfd) \
114 (elf_nds32_tdata (bfd)->local_tlsdesc_gotent)
115
116 /* Hash table structure for target nds32. There are some members to
117 save target options passed from nds32elf.em to bfd. */
118
119 struct elf_nds32_link_hash_table
120 {
121 struct elf_link_hash_table root;
122
123 /* Target dependent options. */
124 int relax_fp_as_gp; /* --mrelax-omit-fp. */
125 int eliminate_gc_relocs; /* --meliminate-gc-relocs. */
126 FILE *sym_ld_script; /* --mgen-symbol-ld-script=<file>. */
127 int hyper_relax; /* Relax for symbol not in RW sections. */
128 int tls_desc_trampoline; /* --m[no-]tlsdesc-trampoline. */
129 /* Disable if linking a dynamically linked executable. */
130 int load_store_relax;
131
132 /* Offset in .plt section of tls_nds32_trampoline. */
133 bfd_vma tls_trampoline;
134
135 /* The index of the next unused R_NDS32_TLS_DESC slot in .rel.plt. */
136 bfd_vma next_tls_desc_index;
137
138 /* How many R_NDS32_TLS_DESC relocations were generated so far. */
139 bfd_vma num_tls_desc;
140
141 /* The amount of space used by the reserved portion of the sgotplt
142 section, plus whatever space is used by the jump slots. */
143 bfd_vma sgotplt_jump_table_size;
144
145 /* True if the target uses REL relocations. */
146 int use_rel;
147 };
148
149 #ifdef __cplusplus
150 }
151 #endif
152
153 #endif /* ELF32_NDS32_H */