elf32-nds32.h revision 1.1.1.2 
1/* NDS32-specific support for 32-bit ELF.
2   Copyright (C) 2012-2015 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/* Relocation flags encoded in r_addend.  */
26
27/* Relocation flags for R_NDS32_ERLAX_ENTRY.  */
28
29/* Set if relax on this section is done or disabled.  */
30#define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG			(1 << 31)
31/* Optimize for performance.  */
32#define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG			(1 << 30)
33/* Optimize for size.  Branch destination 4-byte adjustment
34   may be disabled.  */
35#define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG		(1 << 29)
36/* To distinguish the assembly code generated by compiler
37   or written manually.  */
38#define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG			(1 << 28)
39/* EX9 and link-time IFC must be explicitly enabled, so we
40   won't mess up handcraft assembly code.  */
41/* Enable EX9 optimization for this section.  */
42#define R_NDS32_RELAX_ENTRY_EX9_FLAG				(1 << 2)
43/* Enable IFC optimization for this section.  */
44#define R_NDS32_RELAX_ENTRY_IFC_FLAG				(1 << 3)
45
46
47/* Relocation flags for R_NDS32_INSN16.  */
48
49/* Tag the nop16 can be removed.  */
50#define R_NDS32_INSN16_CONVERT_FLAG				(1 << 0)
51/* Convert a gp-relative access (e.g., lwi.gp)
52   to fp-as-gp access (lwi37.fp).
53   This value is used by linker internally only.
54   It's fine to change the vlaue.  */
55#define R_NDS32_INSN16_FP7U2_FLAG				(1 << 1)
56
57/* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END.  */
58
59/* OMIT_FP_FLAG marks the region for applying fp-as-gp
60   optimization.  */
61#define R_NDS32_RELAX_REGION_OMIT_FP_FLAG			(1 << 0)
62/* NOT_OMIT_FP_FLAG is set if this region is not worth
63   for fp-as-gp.  */
64#define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG			(1 << 1)
65/* Suppress EX9 optimization in the region.  */
66#define R_NDS32_RELAX_REGION_NO_EX9_FLAG			(1 << 2)
67/* A Innermost loop region.  Some optimizations is suppressed
68   in this region due to performance drop.  */
69#define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG		(1 << 4)
70
71/* Tag range for LOADSTORE relocation.  */
72enum
73{
74  NDS32_LOADSTORE_NONE = 0x0,
75  NDS32_LOADSTORE_BYTE = 0x1,
76  NDS32_LOADSTORE_HALF = 0x2,
77  NDS32_LOADSTORE_WORD = 0x4,
78  NDS32_LOADSTORE_FLOAT_S = 0x8,
79  NDS32_LOADSTORE_FLOAT_D = 0x10,
80  NDS32_LOADSTORE_IMM = 0x20
81};
82
83/* Relax tag for nds32_elf_relax_section, we have to specify which
84   optimization do in this round.  */
85enum
86{
87  NDS32_RELAX_NONE_ROUND = 0,
88  NDS32_RELAX_NORMAL_ROUND,
89  NDS32_RELAX_JUMP_IFC_ROUND,
90  NDS32_RELAX_EX9_BUILD_ROUND,
91  NDS32_RELAX_EX9_REPLACE_ROUND,
92  NDS32_RELAX_EMPTY_ROUND
93};
94
95/* Optimization status mask.  */
96#define NDS32_RELAX_JUMP_IFC_DONE	(1 << 0)
97#define NDS32_RELAX_EX9_DONE		(1 << 1)
98
99/* Optimization turn on mask.  */
100#define NDS32_RELAX_JUMP_IFC_ON		(1 << 0)
101#define NDS32_RELAX_EX9_ON		(1 << 1)
102
103extern void nds32_insertion_sort
104  (void *, size_t, size_t, int (*) (const void *, const void *));
105
106extern int         nds32_elf_ex9_init (void);
107extern int         nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
108extern int         nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
109extern void        bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
110						      int, int, FILE *, int,
111						      int, int, int, FILE *,
112						      FILE *, int, int,
113						      bfd_boolean, bfd_boolean);
114
115#define nds32_elf_hash_table(info) \
116  (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
117   == NDS32_ELF_DATA ? \
118   ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
119
120/* Hash table structure for target nds32.  There are some members to
121   save target options passed from nds32elf.em to bfd.  */
122
123struct elf_nds32_link_hash_table
124{
125  struct elf_link_hash_table root;
126
127  /* Short-cuts to get to dynamic linker sections.  */
128  asection *sgot;
129  asection *sgotplt;
130  asection *srelgot;
131  asection *splt;
132  asection *srelplt;
133  asection *sdynbss;
134  asection *srelbss;
135
136  /* Small local sym to section mapping cache.  */
137  struct sym_cache sym_cache;
138
139  /* Target dependent options.  */
140  int relax_fp_as_gp;		/* --mrelax-omit-fp  */
141  int eliminate_gc_relocs;	/* --meliminate-gc-relocs  */
142  FILE *sym_ld_script;		/* --mgen-symbol-ld-script=<file>  */
143  /* Disable if linking a dynamically linked executable.  */
144  int load_store_relax;
145  int target_optimize;		/* Switch optimization.  */
146  int relax_status;		/* Finished optimization.  */
147  int relax_round;		/* Going optimization.  */
148  FILE *ex9_export_file;	/* --mexport-ex9=<file>  */
149  FILE *ex9_import_file;	/* --mimport-ex9=<file>  */
150  int update_ex9_table;		/* --mupdate-ex9.  */
151  int ex9_limit;
152  bfd_boolean ex9_loop_aware;	/* Ignore ex9 if inside a loop.  */
153  bfd_boolean ifc_loop_aware;	/* Ignore ifc if inside a loop.  */
154};
155#endif
156