/* NDS32-specific support for 32-bit ELF.
Copyright (C) 2012-2020 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 void nds32_insertion_sort
(void *, size_t, size_t, int (*) (const void *, const void *));
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(info) \
(elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
== NDS32_ELF_DATA ? \
((struct elf_nds32_link_hash_table *) ((info)->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;
/* Short-cuts to get to dynamic linker sections. */
asection *sdynbss;
asection *srelbss;
/* Small local sym to section mapping cache. */
struct sym_cache sym_cache;
/* 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>. */
bfd_boolean 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;
/* The offset into splt of the PLT entry for the TLS descriptor
resolver. Special values are 0, if not necessary (or not found
to be necessary yet), and -1 if needed but not determined
yet. */
bfd_vma dt_tlsdesc_plt;
/* The offset into sgot of the GOT entry used by the PLT entry
above. */
bfd_vma dt_tlsdesc_got;
/* 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 */