bfd/elf32-nds32.h

   1 /* NDS32-specific support for 32-bit ELF.
   2    Copyright (C) 2012-2023 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                  (1u << 31)
  35 /* Optimize for performance.  */
  36 #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG                       (1u << 30)
  37 /* Optimize for size.  Branch destination 4-byte adjustment
  38    may be disabled.  */
  39 #define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG             (1u << 29)
  40 /* To distinguish the assembly code generated by compiler
  41    or written manually.  */
  42 #define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG                       (1u << 28)
  43 /* Two bits for ICT to comply with files without directive.  */
  44 /* ICT small model.  */
  45 #define R_NDS32_RELAX_ENTRY_ICT_SMALL                           (0x2u << 4)
  46 /* ICT large model.  */
  47 #define R_NDS32_RELAX_ENTRY_ICT_LARGE                           (0x3u << 4)
  48 /* Mask for get ict bits.  */
  49 #define R_NDS32_RELAX_ENTRY_ICT_MASK                            (0x3u << 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                             (1u << 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                               (1u << 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                       (1u << 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                   (1u << 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                (1u << 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
  99 extern int         nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
 100 extern int         nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
 101 extern void        bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
 102                                                       int, int, FILE *,
 103                                                       int, int, int);
 104
 105 #define nds32_elf_hash_table(p) \
 106   ((is_elf_hash_table ((p)->hash)                                       \
 107     && elf_hash_table_id (elf_hash_table (p)) == NDS32_ELF_DATA)        \
 108    ? (struct elf_nds32_link_hash_table *) (p)->hash : NULL)
 109
 110 #define elf32_nds32_compute_jump_table_size(htab) \
 111   ((htab)->next_tls_desc_index * 4)
 112
 113 #define elf32_nds32_local_tlsdesc_gotent(bfd) \
 114   (elf_nds32_tdata (bfd)->local_tlsdesc_gotent)
 115
 116 /* Hash table structure for target nds32.  There are some members to
 117    save target options passed from nds32elf.em to bfd.  */
 118
 119 struct elf_nds32_link_hash_table
 120 {
 121   struct elf_link_hash_table root;
 122
 123   /* Target dependent options.  */
 124   int relax_fp_as_gp;           /* --mrelax-omit-fp.  */
 125   int eliminate_gc_relocs;      /* --meliminate-gc-relocs.  */
 126   FILE *sym_ld_script;          /* --mgen-symbol-ld-script=<file>.  */
 127   int hyper_relax;              /* Relax for symbol not in RW sections.  */
 128   int tls_desc_trampoline;      /* --m[no-]tlsdesc-trampoline.  */
 129   /* Disable if linking a dynamically linked executable.  */
 130   int load_store_relax;
 131
 132   /* Offset in .plt section of tls_nds32_trampoline.  */
 133   bfd_vma tls_trampoline;
 134
 135   /* The index of the next unused R_NDS32_TLS_DESC slot in .rel.plt.  */
 136   bfd_vma next_tls_desc_index;
 137
 138   /* How many R_NDS32_TLS_DESC relocations were generated so far.  */
 139   bfd_vma num_tls_desc;
 140
 141   /* The amount of space used by the reserved portion of the sgotplt
 142      section, plus whatever space is used by the jump slots.  */
 143   bfd_vma sgotplt_jump_table_size;
 144
 145   /* True if the target uses REL relocations.  */
 146   int use_rel;
 147 };
 148
 149 #ifdef __cplusplus
 150 }
 151 #endif
 152
 153 #endif /* ELF32_NDS32_H */