xref: /netbsd/external/gpl3/binutils/dist/bfd/elf32-nds32.h (revision f22f0ef4)

/* NDS32-specific support for 32-bit ELF.
   Copyright (C) 2012-2022 Free Software Foundation, Inc.
   Contributed by Andes Technology Corporation.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.*/

#ifndef ELF32_NDS32_H
#define ELF32_NDS32_H

#ifdef __cplusplus
extern "C" {
#endif

/* Relocation flags encoded in r_addend.  */

/* Relocation flags for R_NDS32_ERLAX_ENTRY.  */

/* Set if relax on this section is done or disabled.  */
#define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG			(1u << 31)
/* Optimize for performance.  */
#define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG			(1u << 30)
/* Optimize for size.  Branch destination 4-byte adjustment
   may be disabled.  */
#define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG		(1u << 29)
/* To distinguish the assembly code generated by compiler
   or written manually.  */
#define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG			(1u << 28)
/* Two bits for ICT to comply with files without directive.  */
/* ICT small model.  */
#define R_NDS32_RELAX_ENTRY_ICT_SMALL                           (0x2u << 4)
/* ICT large model.  */
#define R_NDS32_RELAX_ENTRY_ICT_LARGE                           (0x3u << 4)
/* Mask for get ict bits.  */
#define R_NDS32_RELAX_ENTRY_ICT_MASK                            (0x3u << 4)


/* Relocation flags for R_NDS32_INSN16.  */

/* Tag the nop16 can be removed.  */
#define R_NDS32_INSN16_CONVERT_FLAG				(1u << 0)
/* Convert a gp-relative access (e.g., lwi.gp)
   to fp-as-gp access (lwi37.fp).
   This value is used by linker internally only.
   It's fine to change the vlaue.  */
#define R_NDS32_INSN16_FP7U2_FLAG				(1u << 1)

/* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END.  */

/* OMIT_FP_FLAG marks the region for applying fp-as-gp
   optimization.  */
#define R_NDS32_RELAX_REGION_OMIT_FP_FLAG			(1u << 0)
/* NOT_OMIT_FP_FLAG is set if this region is not worth
   for fp-as-gp.  */
#define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG			(1u << 1)
/* A Innermost loop region.  Some optimizations is suppressed
   in this region due to performance drop.  */
#define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG		(1u << 4)

/* Tag range for LOADSTORE relocation.  */
enum
{
  NDS32_LOADSTORE_NONE = 0x0,
  NDS32_LOADSTORE_BYTE = 0x1,
  NDS32_LOADSTORE_HALF = 0x2,
  NDS32_LOADSTORE_WORD = 0x4,
  NDS32_LOADSTORE_FLOAT_S = 0x8,
  NDS32_LOADSTORE_FLOAT_D = 0x10,
  NDS32_LOADSTORE_IMM = 0x20
};

struct section_id_list_t
{
  int id;
  struct section_id_list_t *next;
};

extern struct section_id_list_t *elf32_nds32_lookup_section_id
  (int, struct section_id_list_t **);
extern int elf32_nds32_check_relax_group (bfd *, asection *);
extern int elf32_nds32_unify_relax_group (bfd *, asection *);
extern int nds32_elf_unify_tls_model (bfd *, asection *, bfd_byte *,
				      struct bfd_link_info *);

extern int	   nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
extern int	   nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
extern void	   bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
						      int, int, FILE *,
						      int, int, int);

#define nds32_elf_hash_table(p) \
  ((is_elf_hash_table ((p)->hash)					\
    && elf_hash_table_id (elf_hash_table (p)) == NDS32_ELF_DATA)	\
   ? (struct elf_nds32_link_hash_table *) (p)->hash : NULL)

#define elf32_nds32_compute_jump_table_size(htab) \
  ((htab)->next_tls_desc_index * 4)

#define elf32_nds32_local_tlsdesc_gotent(bfd) \
  (elf_nds32_tdata (bfd)->local_tlsdesc_gotent)

/* Hash table structure for target nds32.  There are some members to
   save target options passed from nds32elf.em to bfd.  */

struct elf_nds32_link_hash_table
{
  struct elf_link_hash_table root;

  /* Target dependent options.  */
  int relax_fp_as_gp;		/* --mrelax-omit-fp.  */
  int eliminate_gc_relocs;	/* --meliminate-gc-relocs.  */
  FILE *sym_ld_script;		/* --mgen-symbol-ld-script=<file>.  */
  int hyper_relax;		/* Relax for symbol not in RW sections.  */
  int tls_desc_trampoline;	/* --m[no-]tlsdesc-trampoline.  */
  /* Disable if linking a dynamically linked executable.  */
  int load_store_relax;

  /* Offset in .plt section of tls_nds32_trampoline.  */
  bfd_vma tls_trampoline;

  /* The index of the next unused R_NDS32_TLS_DESC slot in .rel.plt.  */
  bfd_vma next_tls_desc_index;

  /* How many R_NDS32_TLS_DESC relocations were generated so far.  */
  bfd_vma num_tls_desc;

  /* The amount of space used by the reserved portion of the sgotplt
     section, plus whatever space is used by the jump slots.  */
  bfd_vma sgotplt_jump_table_size;

  /* True if the target uses REL relocations.  */
  int use_rel;
};

#ifdef __cplusplus
}
#endif

#endif /* ELF32_NDS32_H */