bfd/elf32-nds32.h

   1 /* NDS32-specific support for 32-bit ELF.
   2    Copyright (C) 2012-2018 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 /* Two bits for ICT to comply with files without directive.  */
  50 /* ICT small model.  */
  51 #define R_NDS32_RELAX_ENTRY_ICT_SMALL                           (0x2 << 4)
  52 /* ICT large model.  */
  53 #define R_NDS32_RELAX_ENTRY_ICT_LARGE                           (0x3 << 4)
  54 /* Mask for get ict bits.  */
  55 #define R_NDS32_RELAX_ENTRY_ICT_MASK                            (0x3 << 4)
  56
  57
  58 /* Relocation flags for R_NDS32_INSN16.  */
  59
  60 /* Tag the nop16 can be removed.  */
  61 #define R_NDS32_INSN16_CONVERT_FLAG                             (1 << 0)
  62 /* Convert a gp-relative access (e.g., lwi.gp)
  63    to fp-as-gp access (lwi37.fp).
  64    This value is used by linker internally only.
  65    It's fine to change the vlaue.  */
  66 #define R_NDS32_INSN16_FP7U2_FLAG                               (1 << 1)
  67
  68 /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END.  */
  69
  70 /* OMIT_FP_FLAG marks the region for applying fp-as-gp
  71    optimization.  */
  72 #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG                       (1 << 0)
  73 /* NOT_OMIT_FP_FLAG is set if this region is not worth
  74    for fp-as-gp.  */
  75 #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG                   (1 << 1)
  76 /* Suppress EX9 optimization in the region.  */
  77 #define R_NDS32_RELAX_REGION_NO_EX9_FLAG                        (1 << 2)
  78 /* A Innermost loop region.  Some optimizations is suppressed
  79    in this region due to performance drop.  */
  80 #define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG                (1 << 4)
  81
  82 /* Tag range for LOADSTORE relocation.  */
  83 enum
  84 {
  85   NDS32_LOADSTORE_NONE = 0x0,
  86   NDS32_LOADSTORE_BYTE = 0x1,
  87   NDS32_LOADSTORE_HALF = 0x2,
  88   NDS32_LOADSTORE_WORD = 0x4,
  89   NDS32_LOADSTORE_FLOAT_S = 0x8,
  90   NDS32_LOADSTORE_FLOAT_D = 0x10,
  91   NDS32_LOADSTORE_IMM = 0x20
  92 };
  93
  94 /* Relax tag for nds32_elf_relax_section, we have to specify which
  95    optimization do in this round.  */
  96 enum
  97 {
  98   NDS32_RELAX_NONE_ROUND = 0,
  99   NDS32_RELAX_NORMAL_ROUND,
 100   NDS32_RELAX_JUMP_IFC_ROUND,
 101   NDS32_RELAX_EX9_BUILD_ROUND,
 102   NDS32_RELAX_EX9_REPLACE_ROUND,
 103   NDS32_RELAX_EMPTY_ROUND
 104 };
 105
 106 /* Optimization status mask.  */
 107 #define NDS32_RELAX_JUMP_IFC_DONE       (1 << 0)
 108 #define NDS32_RELAX_EX9_DONE            (1 << 1)
 109
 110 /* Optimization turn on mask.  */
 111 #define NDS32_RELAX_JUMP_IFC_ON         (1 << 0)
 112 #define NDS32_RELAX_EX9_ON              (1 << 1)
 113 \f
 114 extern void nds32_insertion_sort
 115   (void *, size_t, size_t, int (*) (const void *, const void *));
 116
 117 extern int         nds32_elf_ex9_init (void);
 118 extern int         nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
 119 extern int         nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
 120 extern void        bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
 121                                                       int, int, FILE *, int,
 122                                                       int, int, int, FILE *,
 123                                                       FILE *, int, int,
 124                                                       bfd_boolean, bfd_boolean);
 125
 126 #define nds32_elf_hash_table(info) \
 127   (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
 128    == NDS32_ELF_DATA ? \
 129    ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
 130
 131 /* Hash table structure for target nds32.  There are some members to
 132    save target options passed from nds32elf.em to bfd.  */
 133
 134 struct elf_nds32_link_hash_table
 135 {
 136   struct elf_link_hash_table root;
 137
 138   /* Short-cuts to get to dynamic linker sections.  */
 139   asection *sdynbss;
 140   asection *srelbss;
 141
 142   /* Small local sym to section mapping cache.  */
 143   struct sym_cache sym_cache;
 144
 145   /* Target dependent options.  */
 146   int relax_fp_as_gp;           /* --mrelax-omit-fp  */
 147   int eliminate_gc_relocs;      /* --meliminate-gc-relocs  */
 148   FILE *sym_ld_script;          /* --mgen-symbol-ld-script=<file>  */
 149   /* Disable if linking a dynamically linked executable.  */
 150   int load_store_relax;
 151   int target_optimize;          /* Switch optimization.  */
 152   int relax_status;             /* Finished optimization.  */
 153   int relax_round;              /* Going optimization.  */
 154   FILE *ex9_export_file;        /* --mexport-ex9=<file>  */
 155   FILE *ex9_import_file;        /* --mimport-ex9=<file>  */
 156   int update_ex9_table;         /* --mupdate-ex9.  */
 157   int ex9_limit;
 158   bfd_boolean ex9_loop_aware;   /* Ignore ex9 if inside a loop.  */
 159   bfd_boolean ifc_loop_aware;   /* Ignore ifc if inside a loop.  */
 160 };
 161
 162 #ifdef __cplusplus
 163 }
 164 #endif
 165
 166 #endif