bfd/elf32-nds32.h

   1 /* NDS32-specific support for 32-bit ELF.
   2    Copyright (C) 2012-2016 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
  26 extern "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                  (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
  38    may be disabled.  */
  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)
  49
  50
  51 /* Relocation flags for R_NDS32_INSN16.  */
  52
  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)
  60
  61 /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END.  */
  62
  63 /* OMIT_FP_FLAG marks the region for applying fp-as-gp
  64    optimization.  */
  65 #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG                       (1 << 0)
  66 /* NOT_OMIT_FP_FLAG is set if this region is not worth
  67    for fp-as-gp.  */
  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)
  74
  75 /* Tag range for LOADSTORE relocation.  */
  76 enum
  77 {
  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
  85 };
  86
  87 /* Relax tag for nds32_elf_relax_section, we have to specify which
  88    optimization do in this round.  */
  89 enum
  90 {
  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
  97 };
  98
  99 /* Optimization status mask.  */
 100 #define NDS32_RELAX_JUMP_IFC_DONE       (1 << 0)
 101 #define NDS32_RELAX_EX9_DONE            (1 << 1)
 102
 103 /* Optimization turn on mask.  */
 104 #define NDS32_RELAX_JUMP_IFC_ON         (1 << 0)
 105 #define NDS32_RELAX_EX9_ON              (1 << 1)
 106 \f
 107 extern void nds32_insertion_sort
 108   (void *, size_t, size_t, int (*) (const void *, const void *));
 109
 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 *,
 116                                                       FILE *, int, int,
 117                                                       bfd_boolean, bfd_boolean);
 118
 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)
 123
 124 /* Hash table structure for target nds32.  There are some members to
 125    save target options passed from nds32elf.em to bfd.  */
 126
 127 struct elf_nds32_link_hash_table
 128 {
 129   struct elf_link_hash_table root;
 130
 131   /* Short-cuts to get to dynamic linker sections.  */
 132   asection *sgot;
 133   asection *sgotplt;
 134   asection *srelgot;
 135   asection *splt;
 136   asection *srelplt;
 137   asection *sdynbss;
 138   asection *srelbss;
 139
 140   /* Small local sym to section mapping cache.  */
 141   struct sym_cache sym_cache;
 142
 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.  */
 155   int ex9_limit;
 156   bfd_boolean ex9_loop_aware;   /* Ignore ex9 if inside a loop.  */
 157   bfd_boolean ifc_loop_aware;   /* Ignore ifc if inside a loop.  */
 158 };
 159
 160 #ifdef __cplusplus
 161 }
 162 #endif
 163
 164 #endif