1 /* NDS32-specific support for 32-bit ELF.
2 Copyright (C) 2012-2018 Free Software Foundation, Inc.
3 Contributed by Andes Technology Corporation.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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
29 /* Relocation flags encoded in r_addend. */
31 /* Relocation flags for R_NDS32_ERLAX_ENTRY. */
33 /* Set if relax on this section is done or disabled. */
34 #define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG (1 << 31)
35 /* Optimize for performance. */
36 #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG (1 << 30)
37 /* Optimize for size. Branch destination 4-byte adjustment
39 #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG (1 << 29)
40 /* To distinguish the assembly code generated by compiler
41 or written manually. */
42 #define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG (1 << 28)
43 /* Two bits for ICT to comply with files without directive. */
44 /* ICT small model. */
45 #define R_NDS32_RELAX_ENTRY_ICT_SMALL (0x2 << 4)
46 /* ICT large model. */
47 #define R_NDS32_RELAX_ENTRY_ICT_LARGE (0x3 << 4)
48 /* Mask for get ict bits. */
49 #define R_NDS32_RELAX_ENTRY_ICT_MASK (0x3 << 4)
52 /* Relocation flags for R_NDS32_INSN16. */
54 /* Tag the nop16 can be removed. */
55 #define R_NDS32_INSN16_CONVERT_FLAG (1 << 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 (1 << 1)
62 /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END. */
64 /* OMIT_FP_FLAG marks the region for applying fp-as-gp
66 #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG (1 << 0)
67 /* NOT_OMIT_FP_FLAG is set if this region is not worth
69 #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG (1 << 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 (1 << 4)
74 /* Tag range for LOADSTORE relocation. */
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
86 struct section_id_list_t
89 struct section_id_list_t *next;
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 extern void nds32_insertion_sort
99 (void *, size_t, size_t, int (*) (const void *, const void *));
101 extern int nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
102 extern int nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
103 extern void bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
107 #define nds32_elf_hash_table(info) \
108 (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
109 == NDS32_ELF_DATA ? \
110 ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
112 #define elf32_nds32_compute_jump_table_size(htab) \
113 ((htab)->next_tls_desc_index * 4)
115 #define elf32_nds32_local_tlsdesc_gotent(bfd) \
116 (elf_nds32_tdata (bfd)->local_tlsdesc_gotent)
118 /* Hash table structure for target nds32. There are some members to
119 save target options passed from nds32elf.em to bfd. */
121 struct elf_nds32_link_hash_table
123 struct elf_link_hash_table root;
125 /* Short-cuts to get to dynamic linker sections. */
129 /* Small local sym to section mapping cache. */
130 struct sym_cache sym_cache;
132 /* Target dependent options. */
133 int relax_fp_as_gp; /* --mrelax-omit-fp. */
134 int eliminate_gc_relocs; /* --meliminate-gc-relocs. */
135 FILE *sym_ld_script; /* --mgen-symbol-ld-script=<file>. */
136 bfd_boolean hyper_relax; /* Relax for symbol not in RW sections. */
137 int tls_desc_trampoline; /* --m[no-]tlsdesc-trampoline. */
138 /* Disable if linking a dynamically linked executable. */
139 int load_store_relax;
141 /* The offset into splt of the PLT entry for the TLS descriptor
142 resolver. Special values are 0, if not necessary (or not found
143 to be necessary yet), and -1 if needed but not determined
145 bfd_vma dt_tlsdesc_plt;
147 /* The offset into sgot of the GOT entry used by the PLT entry
149 bfd_vma dt_tlsdesc_got;
151 /* Offset in .plt section of tls_nds32_trampoline. */
152 bfd_vma tls_trampoline;
154 /* The index of the next unused R_NDS32_TLS_DESC slot in .rel.plt. */
155 bfd_vma next_tls_desc_index;
157 /* How many R_NDS32_TLS_DESC relocations were generated so far. */
158 bfd_vma num_tls_desc;
160 /* The amount of space used by the reserved portion of the sgotplt
161 section, plus whatever space is used by the jump slots. */
162 bfd_vma sgotplt_jump_table_size;
164 /* True if the target uses REL relocations. */
172 #endif /* ELF32_NDS32_H */