bfd/elf32-nds32.h

   1 /* NDS32-specific support for 32-bit ELF.
   2    Copyright (C) 2012-2014 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.  */
  72 enum
  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 \f
  92 extern void nds32_insertion_sort
  93   (void *, size_t, size_t, int (*) (const void *, const void *));
  94
  95 extern int         nds32_elf_ex9_init (void);
  96 extern void        nds32_elf_ex9_reloc_jmp (struct bfd_link_info *);
  97 extern void        nds32_elf_ex9_finish (struct bfd_link_info *);
  98 extern bfd_boolean nds32_elf_ex9_itb_base (struct bfd_link_info *);
  99 extern void        nds32_elf_ex9_import_table (struct bfd_link_info *);
 100 extern bfd_boolean nds32_elf_ifc_reloc (void);
 101 extern bfd_boolean nds32_elf_ifc_finish (struct bfd_link_info *);
 102 extern int         nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
 103 extern int         nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
 104 extern 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
 115 struct 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