bfd/elf32-nds32.h

   1 /* NDS32-specific support for 32-bit ELF.
   2    Copyright (C) 2012-2019 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 /* Two bits for ICT to comply with files without directive.  */
  44 /* ICT small model.  */
  45 #define R_NDS32_RELAX_ENTRY_ICT_SMALL                           (0x2 << 4)
  46 /* ICT large model.  */
  47 #define R_NDS32_RELAX_ENTRY_ICT_LARGE                           (0x3 << 4)
  48 /* Mask for get ict bits.  */
  49 #define R_NDS32_RELAX_ENTRY_ICT_MASK                            (0x3 << 4)
  50
  51
  52 /* Relocation flags for R_NDS32_INSN16.  */
  53
  54 /* Tag the nop16 can be removed.  */
  55 #define R_NDS32_INSN16_CONVERT_FLAG                             (1 << 0)
  56 /* Convert a gp-relative access (e.g., lwi.gp)
  57    to fp-as-gp access (lwi37.fp).
  58    This value is used by linker internally only.
  59    It's fine to change the vlaue.  */
  60 #define R_NDS32_INSN16_FP7U2_FLAG                               (1 << 1)
  61
  62 /* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END.  */
  63
  64 /* OMIT_FP_FLAG marks the region for applying fp-as-gp
  65    optimization.  */
  66 #define R_NDS32_RELAX_REGION_OMIT_FP_FLAG                       (1 << 0)
  67 /* NOT_OMIT_FP_FLAG is set if this region is not worth
  68    for fp-as-gp.  */
  69 #define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG                   (1 << 1)
  70 /* A Innermost loop region.  Some optimizations is suppressed
  71    in this region due to performance drop.  */
  72 #define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG                (1 << 4)
  73
  74 /* Tag range for LOADSTORE relocation.  */
  75 enum
  76 {
  77   NDS32_LOADSTORE_NONE = 0x0,
  78   NDS32_LOADSTORE_BYTE = 0x1,
  79   NDS32_LOADSTORE_HALF = 0x2,
  80   NDS32_LOADSTORE_WORD = 0x4,
  81   NDS32_LOADSTORE_FLOAT_S = 0x8,
  82   NDS32_LOADSTORE_FLOAT_D = 0x10,
  83   NDS32_LOADSTORE_IMM = 0x20
  84 };
  85
  86 struct section_id_list_t
  87 {
  88   int id;
  89   struct section_id_list_t *next;
  90 };
  91
  92 extern struct section_id_list_t *elf32_nds32_lookup_section_id
  93   (int, struct section_id_list_t **);
  94 extern int elf32_nds32_check_relax_group (bfd *, asection *);
  95 extern int elf32_nds32_unify_relax_group (bfd *, asection *);
  96 extern int nds32_elf_unify_tls_model (bfd *, asection *, bfd_byte *,
  97                                       struct bfd_link_info *);
  98 extern void nds32_insertion_sort
  99 (void *, size_t, size_t, int (*) (const void *, const void *));
 100
 101 extern int         nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
 102 extern int         nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
 103 extern void        bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
 104                                                       int, int, FILE *,
 105                                                       int, int, int);
 106
 107 #define nds32_elf_hash_table(info) \
 108   (elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
 109    == NDS32_ELF_DATA ? \
 110    ((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
 111
 112 #define elf32_nds32_compute_jump_table_size(htab) \
 113   ((htab)->next_tls_desc_index * 4)
 114
 115 #define elf32_nds32_local_tlsdesc_gotent(bfd) \
 116   (elf_nds32_tdata (bfd)->local_tlsdesc_gotent)
 117
 118 /* Hash table structure for target nds32.  There are some members to
 119    save target options passed from nds32elf.em to bfd.  */
 120
 121 struct elf_nds32_link_hash_table
 122 {
 123   struct elf_link_hash_table root;
 124
 125   /* Short-cuts to get to dynamic linker sections.  */
 126   asection *sdynbss;
 127   asection *srelbss;
 128
 129   /* Small local sym to section mapping cache.  */
 130   struct sym_cache sym_cache;
 131
 132   /* Target dependent options.  */
 133   int relax_fp_as_gp;           /* --mrelax-omit-fp.  */
 134   int eliminate_gc_relocs;      /* --meliminate-gc-relocs.  */
 135   FILE *sym_ld_script;          /* --mgen-symbol-ld-script=<file>.  */
 136   bfd_boolean hyper_relax;      /* Relax for symbol not in RW sections.  */
 137   int tls_desc_trampoline;      /* --m[no-]tlsdesc-trampoline.  */
 138   /* Disable if linking a dynamically linked executable.  */
 139   int load_store_relax;
 140
 141   /* The offset into splt of the PLT entry for the TLS descriptor
 142      resolver.  Special values are 0, if not necessary (or not found
 143      to be necessary yet), and -1 if needed but not determined
 144      yet.  */
 145   bfd_vma dt_tlsdesc_plt;
 146
 147   /* The offset into sgot of the GOT entry used by the PLT entry
 148      above.  */
 149   bfd_vma dt_tlsdesc_got;
 150
 151   /* Offset in .plt section of tls_nds32_trampoline.  */
 152   bfd_vma tls_trampoline;
 153
 154   /* The index of the next unused R_NDS32_TLS_DESC slot in .rel.plt.  */
 155   bfd_vma next_tls_desc_index;
 156
 157   /* How many R_NDS32_TLS_DESC relocations were generated so far.  */
 158   bfd_vma num_tls_desc;
 159
 160   /* The amount of space used by the reserved portion of the sgotplt
 161      section, plus whatever space is used by the jump slots.  */
 162   bfd_vma sgotplt_jump_table_size;
 163
 164   /* True if the target uses REL relocations.  */
 165   int use_rel;
 166 };
 167
 168 #ifdef __cplusplus
 169 }
 170 #endif
 171
 172 #endif /* ELF32_NDS32_H */