1/* NDS32-specific support for 32-bit ELF.
2   Copyright (C) 2012-2024 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
26extern "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.  */
75enum
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
86struct section_id_list_t
87{
88  int id;
89  struct section_id_list_t *next;
90};
91
92extern struct section_id_list_t *elf32_nds32_lookup_section_id
93  (int, struct section_id_list_t **);
94extern int elf32_nds32_check_relax_group (bfd *, asection *);
95extern int elf32_nds32_unify_relax_group (bfd *, asection *);
96extern int nds32_elf_unify_tls_model (bfd *, asection *, bfd_byte *,
97				      struct bfd_link_info *);
98
99extern int	   nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
100extern int	   nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
101extern 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
119struct 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 */
154