elf32-nds32.h revision 1.1.1.1 
1/* NDS32-specific support for 32-bit ELF.
2   Copyright (C) 2012-2013 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#define R_NDS32_INSN16_CONVERT_FLAG				(1 << 0)
50/* Convert a gp-relative access (e.g., lwi.gp)
51   to fp-as-gp access (lwi37.fp).
52   This value is used by linker internally only.
53   It's fine to change the vlaue.  */
54#define R_NDS32_INSN16_FP7U2_FLAG				(1 << 1)
55
56/* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END.  */
57
58/* OMIT_FP_FLAG marks the region for applying fp-as-gp
59   optimization.  */
60#define R_NDS32_RELAX_REGION_OMIT_FP_FLAG			(1 << 0)
61/* NOT_OMIT_FP_FLAG is set if this region is not worth
62   for fp-as-gp.  */
63#define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG			(1 << 1)
64/* Suppress EX9 optimization in the region.  */
65#define R_NDS32_RELAX_REGION_NO_EX9_FLAG			(1 << 2)
66/* A Innermost loop region.  Some optimizations is suppressed
67   in this region due to performance drop.  */
68#define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG		(1 << 4)
69
70/* Relax tag for nds32_elf_relax_section, we have to specify which
71   optimization do in this round.  */
72enum
73{
74  NDS32_RELAX_NONE_ROUND = 0,
75  NDS32_RELAX_JUMP_IFC_ROUND = 1,
76  NDS32_RELAX_EX9_BUILD_ROUND,
77  NDS32_RELAX_EX9_REPLACE_ROUND
78
79};
80
81/* Optimization status mask.  */
82#define NDS32_RELAX_JUMP_IFC_DONE	(1 << 0)
83#define NDS32_RELAX_EX9_DONE		(1 << 1)
84
85/* Optimization turn on mask.  */
86#define NDS32_RELAX_JUMP_IFC_ON		(1 << 0)
87#define NDS32_RELAX_EX9_ON		(1 << 1)
88
89/* The break 0xea defined for ex9 table to keep for trace32 to use 0xeaea.  */
90#define INSN_BREAK_EA   0x64001d4a
91
92extern void nds32_insertion_sort
93  (void *, size_t, size_t, int (*) (const void *, const void *));
94
95extern int         nds32_elf_ex9_init (void);
96extern void        nds32_elf_ex9_reloc_jmp (struct bfd_link_info *);
97extern void        nds32_elf_ex9_finish (struct bfd_link_info *);
98extern bfd_boolean nds32_elf_ex9_itb_base (struct bfd_link_info *);
99extern void        nds32_elf_ex9_import_table (struct bfd_link_info *);
100extern bfd_boolean nds32_elf_ifc_reloc (void);
101extern bfd_boolean nds32_elf_ifc_finish (struct bfd_link_info *);
102extern int         nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
103extern int         nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
104extern void        bfd_elf32_nds32_set_target_option (struct bfd_link_info *, int, int,
105						      FILE *, int, int, int, int, FILE *, FILE *,
106						      int, int, bfd_boolean, bfd_boolean);
107
108#define nds32_elf_hash_table(info) \
109  (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
110   == NDS32_ELF_DATA ? ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
111
112/* Hash table structure for target nds32.  There are some members to
113   save target options passed from nds32elf.em to bfd.  */
114
115struct elf_nds32_link_hash_table
116{
117  struct elf_link_hash_table root;
118
119  /* Short-cuts to get to dynamic linker sections.  */
120  asection *sgot;
121  asection *sgotplt;
122  asection *srelgot;
123  asection *splt;
124  asection *srelplt;
125  asection *sdynbss;
126  asection *srelbss;
127
128  /* Small local sym to section mapping cache.  */
129  struct sym_cache sym_cache;
130
131  /* Target dependent options.  */
132  int relax_fp_as_gp;		/* --mrelax-omit-fp  */
133  int eliminate_gc_relocs;	/* --meliminate-gc-relocs  */
134  FILE *sym_ld_script;		/* --mgen-symbol-ld-script=<file>  */
135  /* Disable if linking a dynamically linked executable.  */
136  int load_store_relax;
137  int target_optimize;		/* Switch optimization.  */
138  int relax_status;		/* Finished optimization.  */
139  int relax_round;		/* Going optimization.  */
140  FILE *ex9_export_file;	/* --mexport-ex9=<file>  */
141  FILE *ex9_import_file;	/* --mimport-ex9=<file>  */
142  int update_ex9_table;		/* --mupdate-ex9.  */
143  int ex9_limit;
144  bfd_boolean ex9_loop_aware;	/* Ignore ex9 if inside a loop.  */
145  bfd_boolean ifc_loop_aware;	/* Ignore ifc if inside a loop.  */
146};
147#endif
148