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1c8f6a4d1f
Refactor each relaxation pattern to raise the maintainability.
In origin, all patterns is analysed in nds32_elf_relax_section,
so it is hard to debug and maintain. Therefore, we classify all
patterns into different functions in this patch.
Moreover, we adjust all optimizations into nds32_elf_relax_section
to take these optimizations in turn. This can promise all relaxation
being done after calling gld${EMULATION_NAME}_after_allocation.
156 lines
5.4 KiB
C
156 lines
5.4 KiB
C
/* NDS32-specific support for 32-bit ELF.
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Copyright (C) 2012-2014 Free Software Foundation, Inc.
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Contributed by Andes Technology Corporation.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA.*/
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#ifndef ELF32_NDS32_H
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#define ELF32_NDS32_H
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/* Relocation flags encoded in r_addend. */
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/* Relocation flags for R_NDS32_ERLAX_ENTRY. */
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/* Set if relax on this section is done or disabled. */
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#define R_NDS32_RELAX_ENTRY_DISABLE_RELAX_FLAG (1 << 31)
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/* Optimize for performance. */
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#define R_NDS32_RELAX_ENTRY_OPTIMIZE_FLAG (1 << 30)
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/* Optimize for size. Branch destination 4-byte adjustment
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may be disabled. */
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#define R_NDS32_RELAX_ENTRY_OPTIMIZE_FOR_SPACE_FLAG (1 << 29)
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/* To distinguish the assembly code generated by compiler
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or written manually. */
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#define R_NDS32_RELAX_ENTRY_VERBATIM_FLAG (1 << 28)
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/* EX9 and link-time IFC must be explicitly enabled, so we
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won't mess up handcraft assembly code. */
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/* Enable EX9 optimization for this section. */
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#define R_NDS32_RELAX_ENTRY_EX9_FLAG (1 << 2)
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/* Enable IFC optimization for this section. */
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#define R_NDS32_RELAX_ENTRY_IFC_FLAG (1 << 3)
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/* Relocation flags for R_NDS32_INSN16. */
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/* Tag the nop16 can be removed. */
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#define R_NDS32_INSN16_CONVERT_FLAG (1 << 0)
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/* Convert a gp-relative access (e.g., lwi.gp)
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to fp-as-gp access (lwi37.fp).
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This value is used by linker internally only.
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It's fine to change the vlaue. */
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#define R_NDS32_INSN16_FP7U2_FLAG (1 << 1)
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/* Relocation flags for R_NDS32_RELAX_REGION_OMIT_FP_START/END. */
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/* OMIT_FP_FLAG marks the region for applying fp-as-gp
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optimization. */
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#define R_NDS32_RELAX_REGION_OMIT_FP_FLAG (1 << 0)
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/* NOT_OMIT_FP_FLAG is set if this region is not worth
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for fp-as-gp. */
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#define R_NDS32_RELAX_REGION_NOT_OMIT_FP_FLAG (1 << 1)
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/* Suppress EX9 optimization in the region. */
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#define R_NDS32_RELAX_REGION_NO_EX9_FLAG (1 << 2)
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/* A Innermost loop region. Some optimizations is suppressed
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in this region due to performance drop. */
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#define R_NDS32_RELAX_REGION_INNERMOST_LOOP_FLAG (1 << 4)
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/* Tag range for LOADSTORE relocation. */
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enum
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{
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NDS32_LOADSTORE_NONE = 0x0,
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NDS32_LOADSTORE_BYTE = 0x1,
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NDS32_LOADSTORE_HALF = 0x2,
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NDS32_LOADSTORE_WORD = 0x4,
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NDS32_LOADSTORE_FLOAT_S = 0x8,
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NDS32_LOADSTORE_FLOAT_D = 0x10,
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NDS32_LOADSTORE_IMM = 0x20
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};
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/* Relax tag for nds32_elf_relax_section, we have to specify which
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optimization do in this round. */
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enum
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{
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NDS32_RELAX_NONE_ROUND = 0,
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NDS32_RELAX_NORMAL_ROUND,
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NDS32_RELAX_JUMP_IFC_ROUND,
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NDS32_RELAX_EX9_BUILD_ROUND,
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NDS32_RELAX_EX9_REPLACE_ROUND,
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NDS32_RELAX_EMPTY_ROUND
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};
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/* Optimization status mask. */
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#define NDS32_RELAX_JUMP_IFC_DONE (1 << 0)
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#define NDS32_RELAX_EX9_DONE (1 << 1)
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/* Optimization turn on mask. */
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#define NDS32_RELAX_JUMP_IFC_ON (1 << 0)
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#define NDS32_RELAX_EX9_ON (1 << 1)
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extern void nds32_insertion_sort
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(void *, size_t, size_t, int (*) (const void *, const void *));
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extern int nds32_elf_ex9_init (void);
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extern int nds32_convert_32_to_16 (bfd *, uint32_t, uint16_t *, int *);
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extern int nds32_convert_16_to_32 (bfd *, uint16_t, uint32_t *);
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extern void bfd_elf32_nds32_set_target_option (struct bfd_link_info *,
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int, int, FILE *, int,
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int, int, int, FILE *,
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FILE *, int, int,
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bfd_boolean, bfd_boolean);
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#define nds32_elf_hash_table(info) \
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(elf_hash_table_id ((struct elf_link_hash_table *) ((info)->hash)) \
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== NDS32_ELF_DATA ? \
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((struct elf_nds32_link_hash_table *) ((info)->hash)) : NULL)
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/* Hash table structure for target nds32. There are some members to
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save target options passed from nds32elf.em to bfd. */
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struct elf_nds32_link_hash_table
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{
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struct elf_link_hash_table root;
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/* Short-cuts to get to dynamic linker sections. */
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asection *sgot;
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asection *sgotplt;
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asection *srelgot;
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asection *splt;
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asection *srelplt;
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asection *sdynbss;
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asection *srelbss;
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/* Small local sym to section mapping cache. */
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struct sym_cache sym_cache;
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/* Target dependent options. */
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int relax_fp_as_gp; /* --mrelax-omit-fp */
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int eliminate_gc_relocs; /* --meliminate-gc-relocs */
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FILE *sym_ld_script; /* --mgen-symbol-ld-script=<file> */
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/* Disable if linking a dynamically linked executable. */
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int load_store_relax;
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int target_optimize; /* Switch optimization. */
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int relax_status; /* Finished optimization. */
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int relax_round; /* Going optimization. */
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FILE *ex9_export_file; /* --mexport-ex9=<file> */
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FILE *ex9_import_file; /* --mimport-ex9=<file> */
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int update_ex9_table; /* --mupdate-ex9. */
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int ex9_limit;
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bfd_boolean ex9_loop_aware; /* Ignore ex9 if inside a loop. */
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bfd_boolean ifc_loop_aware; /* Ignore ifc if inside a loop. */
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};
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#endif
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