1 /* NDS32-specific support for 32-bit ELF.
2 Copyright (C) 2012-2016 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 /* EX9 and link-time IFC must be explicitly enabled, so we
44 won't mess up handcraft assembly code. */
45 /* Enable EX9 optimization for this section. */
46 #define R_NDS32_RELAX_ENTRY_EX9_FLAG (1 << 2)
47 /* Enable IFC optimization for this section. */
48 #define R_NDS32_RELAX_ENTRY_IFC_FLAG (1 << 3)
51 /* Relocation flags for R_NDS32_INSN16. */
53 /* Tag the nop16 can be removed. */
54 #define R_NDS32_INSN16_CONVERT_FLAG (1 << 0)
55 /* Convert a gp-relative access (e.g., lwi.gp)
56 to fp-as-gp access (lwi37.fp).
57 This value is used by linker internally only.
58 It's fine to change the vlaue. */
59 #define R_NDS32_INSN16_FP7U2_FLAG (1 << 1)
61 /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END. */
63 /* OMIT_FP_FLAG marks the region for applying fp-as-gp
65 #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG (1 << 0)
66 /* NOT_OMIT_FP_FLAG is set if this region is not worth
68 #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG (1 << 1)
69 /* Suppress EX9 optimization in the region. */
70 #define R_NDS32_RELAX_REGION_NO_EX9_FLAG (1 << 2)
71 /* A Innermost loop region. Some optimizations is suppressed
72 in this region due to performance drop. */
73 #define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG (1 << 4)
75 /* Tag range for LOADSTORE relocation. */
78 NDS32_LOADSTORE_NONE = 0x0,
79 NDS32_LOADSTORE_BYTE = 0x1,
80 NDS32_LOADSTORE_HALF = 0x2,
81 NDS32_LOADSTORE_WORD = 0x4,
82 NDS32_LOADSTORE_FLOAT_S = 0x8,
83 NDS32_LOADSTORE_FLOAT_D = 0x10,
84 NDS32_LOADSTORE_IMM = 0x20
87 /* Relax tag for nds32_elf_relax_section, we have to specify which
88 optimization do in this round. */
91 NDS32_RELAX_NONE_ROUND = 0,
92 NDS32_RELAX_NORMAL_ROUND,
93 NDS32_RELAX_JUMP_IFC_ROUND,
94 NDS32_RELAX_EX9_BUILD_ROUND,
95 NDS32_RELAX_EX9_REPLACE_ROUND,
96 NDS32_RELAX_EMPTY_ROUND
99 /* Optimization status mask. */
100 #define NDS32_RELAX_JUMP_IFC_DONE (1 << 0)
101 #define NDS32_RELAX_EX9_DONE (1 << 1)
103 /* Optimization turn on mask. */
104 #define NDS32_RELAX_JUMP_IFC_ON (1 << 0)
105 #define NDS32_RELAX_EX9_ON (1 << 1)
107 extern void nds32_insertion_sort
108 (void *, size_t, size_t, int (*) (const void *, const void *));
110 extern int nds32_elf_ex9_init (void);
111 extern int nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
112 extern int nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
113 extern void bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
114 int, int, FILE *, int,
115 int, int, int, FILE *,
117 bfd_boolean, bfd_boolean);
119 #define nds32_elf_hash_table(info) \
120 (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
121 == NDS32_ELF_DATA ? \
122 ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
124 /* Hash table structure for target nds32. There are some members to
125 save target options passed from nds32elf.em to bfd. */
127 struct elf_nds32_link_hash_table
129 struct elf_link_hash_table root;
131 /* Short-cuts to get to dynamic linker sections. */
140 /* Small local sym to section mapping cache. */
141 struct sym_cache sym_cache;
143 /* Target dependent options. */
144 int relax_fp_as_gp; /* --mrelax-omit-fp */
145 int eliminate_gc_relocs; /* --meliminate-gc-relocs */
146 FILE *sym_ld_script; /* --mgen-symbol-ld-script=<file> */
147 /* Disable if linking a dynamically linked executable. */
148 int load_store_relax;
149 int target_optimize; /* Switch optimization. */
150 int relax_status; /* Finished optimization. */
151 int relax_round; /* Going optimization. */
152 FILE *ex9_export_file; /* --mexport-ex9=<file> */
153 FILE *ex9_import_file; /* --mimport-ex9=<file> */
154 int update_ex9_table; /* --mupdate-ex9. */
156 bfd_boolean ex9_loop_aware; /* Ignore ex9 if inside a loop. */
157 bfd_boolean ifc_loop_aware; /* Ignore ifc if inside a loop. */