391 lines
12 KiB
C
391 lines
12 KiB
C
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/* This file is tc-arm.h
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Copyright (C) 1994-2022 Free Software Foundation, Inc.
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Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
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Modified by David Taylor (dtaylor@armltd.co.uk)
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This file is part of GAS, the GNU Assembler.
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GAS 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, or (at your option)
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any later version.
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GAS 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 GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#define TC_ARM 1
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#ifndef TARGET_BYTES_BIG_ENDIAN
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#define TARGET_BYTES_BIG_ENDIAN 0
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#endif
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#define WORKING_DOT_WORD
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#define COFF_MAGIC ARMMAGIC
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#define TARGET_ARCH bfd_arch_arm
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#define DIFF_EXPR_OK
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#ifdef LITTLE_ENDIAN
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#undef LITTLE_ENDIAN
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#endif
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#ifdef BIG_ENDIAN
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#undef BIG_ENDIAN
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#endif
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#define LITTLE_ENDIAN 1234
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#define BIG_ENDIAN 4321
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struct fix;
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#if defined OBJ_COFF
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# define ARM_BI_ENDIAN
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# if defined TE_PE
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# if defined TE_WINCE
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# define TARGET_FORMAT (target_big_endian ? "pe-arm-wince-big" : "pe-arm-wince-little")
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# else
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# define TARGET_FORMAT (target_big_endian ? "pe-arm-big" : "pe-arm-little")
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# endif
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# else
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# define TARGET_FORMAT (target_big_endian ? "coff-arm-big" : "coff-arm-little")
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# endif
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#elif defined OBJ_ELF
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# define ARM_BI_ENDIAN
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# define TARGET_FORMAT elf32_arm_target_format ()
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#endif
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/* We support double slash line-comments for compatibility with the ARM AArch64 Assembler. */
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#define DOUBLESLASH_LINE_COMMENTS
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/* We conditionally support labels without a colon. */
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#define LABELS_WITHOUT_COLONS codecomposer_syntax
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extern bool codecomposer_syntax;
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#define tc_symbol_chars arm_symbol_chars
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extern const char arm_symbol_chars[];
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#define TC_FORCE_RELOCATION(FIX) arm_force_relocation (FIX)
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extern unsigned int arm_frag_max_var (struct frag *);
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#define md_frag_max_var arm_frag_max_var
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#define md_relax_frag(segment, fragp, stretch) \
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arm_relax_frag (segment, fragp, stretch)
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extern int arm_relax_frag (asection *, struct frag *, long);
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#define md_optimize_expr(l,o,r) arm_optimize_expr (l, o, r)
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extern bool arm_optimize_expr (expressionS *, operatorT, expressionS *);
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#define md_cleanup() arm_cleanup ()
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#define md_start_line_hook() arm_start_line_hook ()
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#define TC_START_LABEL_WITHOUT_COLON(NUL_CHAR, NEXT_CHAR) \
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tc_start_label_without_colon ()
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extern bool tc_start_label_without_colon (void);
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#define tc_frob_label(S) arm_frob_label (S)
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/* We also need to mark assembler created symbols: */
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#define tc_frob_fake_label(S) arm_frob_label (S)
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#ifdef OBJ_ELF
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#define md_end arm_md_end
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extern void arm_md_end (void);
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bool arm_is_eabi (void);
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#define md_post_relax_hook arm_md_post_relax ()
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extern void arm_md_post_relax (void);
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#endif
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/* NOTE: The fake label creation in stabs.c:s_stab_generic() has
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deliberately not been updated to mark assembler created stabs
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symbols as Thumb. */
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#define TC_FIX_TYPE int
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#define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = 0)
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/* We need to keep some local information on symbols. */
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#define TC_SYMFIELD_TYPE unsigned int
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#define ARM_GET_FLAG(s) (*symbol_get_tc (s))
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#define ARM_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v))
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#define ARM_RESET_FLAG(s,v) (*symbol_get_tc (s) &= ~(v))
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#define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */
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#define ARM_FLAG_INTERWORK (1 << 1) /* The symbol is attached to code that supports interworking. */
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#define THUMB_FLAG_FUNC (1 << 2) /* The symbol is attached to the start of a Thumb function. */
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#define ARM_IS_THUMB(s) (ARM_GET_FLAG (s) & ARM_FLAG_THUMB)
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#define ARM_IS_INTERWORK(s) (ARM_GET_FLAG (s) & ARM_FLAG_INTERWORK)
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#ifdef OBJ_ELF
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/* For ELF objects THUMB_IS_FUNC is inferred from
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ARM_IS_THUMB and the function type. */
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#define THUMB_IS_FUNC(s) \
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((s) != NULL \
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&& ((arm_is_eabi () \
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&& (ARM_IS_THUMB (s)) \
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&& (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)) \
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|| (ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)))
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#define ARM_IS_FUNC(s) \
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(((s) != NULL \
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&& arm_is_eabi () \
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&& !(ARM_IS_THUMB (s)) \
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/* && !(THUMB_FLAG_FUNC & ARM_GET_FLAG (s)) \ */ \
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&& (symbol_get_bfdsym (s)->flags & BSF_FUNCTION)))
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#else
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#define THUMB_IS_FUNC(s) ((s) && ARM_GET_FLAG (s) & THUMB_FLAG_FUNC)
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#define ARM_IS_FUNC(s) (!THUMB_IS_FUNC (s) \
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&& (s) && (symbol_get_bfdsym (s)->flags & BSF_FUNCTION))
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#endif
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#define ARM_SET_THUMB(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_THUMB) : ARM_RESET_FLAG (s, ARM_FLAG_THUMB))
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#define ARM_SET_INTERWORK(s,t) ((t) ? ARM_SET_FLAG (s, ARM_FLAG_INTERWORK) : ARM_RESET_FLAG (s, ARM_FLAG_INTERWORK))
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#define THUMB_SET_FUNC(s,t) ((t) ? ARM_SET_FLAG (s, THUMB_FLAG_FUNC) : ARM_RESET_FLAG (s, THUMB_FLAG_FUNC))
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void arm_copy_symbol_attributes (symbolS *, symbolS *);
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#ifndef TC_COPY_SYMBOL_ATTRIBUTES
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#define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
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(arm_copy_symbol_attributes (DEST, SRC))
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#endif
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#define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR) \
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(NEXT_CHAR == ':' || (NEXT_CHAR == '/' && arm_data_in_code ()))
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#define tc_canonicalize_symbol_name(str) arm_canonicalize_symbol_name (str);
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#define obj_adjust_symtab() arm_adjust_symtab ()
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#define LISTING_HEADER "ARM GAS "
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#define OPTIONAL_REGISTER_PREFIX '%'
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#define LOCAL_LABEL(name) (name[0] == '.' && name[1] == 'L')
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#define LOCAL_LABELS_FB 1
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/* This expression evaluates to true if the relocation is for a local
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object for which we still want to do the relocation at runtime.
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False if we are willing to perform this relocation while building
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the .o file. GOTOFF does not need to be checked here because it is
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not pcrel. I am not sure if some of the others are ever used with
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pcrel, but it is easier to be safe than sorry. */
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#define TC_FORCE_RELOCATION_LOCAL(FIX) \
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(GENERIC_FORCE_RELOCATION_LOCAL (FIX) \
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|| (FIX)->fx_r_type == BFD_RELOC_ARM_GOT32 \
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|| (FIX)->fx_r_type == BFD_RELOC_32 \
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|| ((FIX)->fx_addsy != NULL \
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&& S_IS_WEAK ((FIX)->fx_addsy)))
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/* Force output of R_ARM_REL32 relocations against thumb function symbols.
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This is needed to ensure the low bit is handled correctly. */
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#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
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(GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEG) \
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|| THUMB_IS_FUNC ((FIX)->fx_addsy))
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#define TC_FORCE_RELOCATION_ABS(FIX) \
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(((FIX)->fx_pcrel \
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&& (FIX)->fx_r_type != BFD_RELOC_32 \
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&& (FIX)->fx_r_type != BFD_RELOC_ARM_GOT32) \
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|| TC_FORCE_RELOCATION(FIX))
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#define TC_CONS_FIX_NEW cons_fix_new_arm
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#define MAX_MEM_ALIGNMENT_BYTES 6
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#define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << MAX_MEM_ALIGNMENT_BYTES) - 1)
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/* For frags in code sections we need to record whether they contain
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ARM code or THUMB code. This is that if they have to be aligned,
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they can contain the correct type of no-op instruction. */
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struct arm_frag_type
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{
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int thumb_mode;
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#ifdef OBJ_ELF
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/* If there is a mapping symbol at offset 0 in this frag,
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it will be saved in FIRST_MAP. If there are any mapping
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symbols in this frag, the last one will be saved in
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LAST_MAP. */
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symbolS *first_map, *last_map;
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#endif
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};
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static inline int
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arm_min (int am_p1, int am_p2)
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{
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return am_p1 < am_p2 ? am_p1 : am_p2;
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}
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#define TC_FRAG_TYPE struct arm_frag_type
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#define TC_FRAG_INIT(fragp, max_bytes) arm_init_frag (fragp, max_bytes)
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#define TC_ALIGN_ZERO_IS_DEFAULT 1
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#define HANDLE_ALIGN(fragp) arm_handle_align (fragp)
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/* PR gas/19276: COFF/PE segment alignment is already handled in coff_frob_section(). */
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#ifndef TE_PE
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#define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
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((!(FRCHAIN)->frch_next && subseg_text_p (SEG)) \
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? arm_min (2, get_recorded_alignment (SEG)) : 0)
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#endif
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#define md_do_align(N, FILL, LEN, MAX, LABEL) \
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if (FILL == NULL && (N) != 0 && ! need_pass_2 && subseg_text_p (now_seg)) \
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{ \
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arm_frag_align_code (N, MAX); \
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goto LABEL; \
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}
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#define DWARF2_LINE_MIN_INSN_LENGTH 2
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/* The lr register is r14. */
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#define DWARF2_DEFAULT_RETURN_COLUMN 14
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/* Registers are generally saved at negative offsets to the CFA. */
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#define DWARF2_CIE_DATA_ALIGNMENT (-4)
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/* State variables for predication block handling. */
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enum pred_state
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{
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OUTSIDE_PRED_BLOCK, MANUAL_PRED_BLOCK, AUTOMATIC_PRED_BLOCK
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};
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enum pred_type {
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SCALAR_PRED, VECTOR_PRED
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};
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struct current_pred
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{
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int mask;
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enum pred_state state;
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int cc;
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int block_length;
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char *insn;
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int state_handled;
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int warn_deprecated;
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int insn_cond;
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enum pred_type type;
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};
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#ifdef OBJ_ELF
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# define obj_frob_symbol(sym, punt) armelf_frob_symbol ((sym), & (punt))
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# define md_elf_section_change_hook() arm_elf_change_section ()
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# define md_elf_section_type(str, len) arm_elf_section_type (str, len)
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# define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
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# define TC_SEGMENT_INFO_TYPE struct arm_segment_info_type
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/* This is not really an alignment operation, but it's something we
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need to do at the same time: whenever we are figuring out the
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alignment for data, we should check whether a $d symbol is
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necessary. */
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# define md_cons_align(nbytes) mapping_state (MAP_DATA)
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enum mstate
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{
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MAP_UNDEFINED = 0, /* Must be zero, for seginfo in new sections. */
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MAP_DATA,
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MAP_ARM,
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MAP_THUMB
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};
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void mapping_state (enum mstate);
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struct arm_segment_info_type
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{
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enum mstate mapstate;
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/* Bit N indicates that an R_ARM_NONE relocation has been output for
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__aeabi_unwind_cpp_prN already if set. This enables dependencies to be
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emitted only once per section, to save unnecessary bloat. */
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unsigned int marked_pr_dependency;
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struct current_pred current_pred;
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};
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/* We want .cfi_* pseudo-ops for generating unwind info. */
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#define TARGET_USE_CFIPOP 1
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/* CFI hooks. */
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#define tc_regname_to_dw2regnum tc_arm_regname_to_dw2regnum
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#define tc_cfi_frame_initial_instructions tc_arm_frame_initial_instructions
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#else /* Not OBJ_ELF. */
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#define GLOBAL_OFFSET_TABLE_NAME "__GLOBAL_OFFSET_TABLE_"
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#endif
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#if defined OBJ_ELF || defined OBJ_COFF
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# define EXTERN_FORCE_RELOC 1
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# define tc_fix_adjustable(FIX) arm_fix_adjustable (FIX)
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#endif
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#ifdef OBJ_ELF
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/* Values passed to md_apply_fix don't include the symbol value. */
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# define MD_APPLY_SYM_VALUE(FIX) arm_apply_sym_value (FIX, this_segment)
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#endif
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#ifdef OBJ_COFF
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# define TC_VALIDATE_FIX(FIX, SEGTYPE, LABEL) arm_validate_fix (FIX)
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/* Values passed to md_apply_fix don't include the symbol value. */
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# define MD_APPLY_SYM_VALUE(FIX) 0
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#endif
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#define MD_PCREL_FROM_SECTION(F,S) md_pcrel_from_section(F,S)
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extern void arm_frag_align_code (int, int);
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extern void arm_validate_fix (struct fix *);
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extern const char * elf32_arm_target_format (void);
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extern void arm_elf_change_section (void);
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extern int arm_force_relocation (struct fix *);
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extern void arm_cleanup (void);
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extern void arm_start_line_hook (void);
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extern void arm_frob_label (symbolS *);
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extern bool arm_data_in_code (void);
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extern char * arm_canonicalize_symbol_name (char *);
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extern void arm_adjust_symtab (void);
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extern void armelf_frob_symbol (symbolS *, int *);
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extern void cons_fix_new_arm (fragS *, int, int, expressionS *,
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bfd_reloc_code_real_type);
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extern void arm_init_frag (struct frag *, int);
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extern void arm_handle_align (struct frag *);
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extern bool arm_fix_adjustable (struct fix *);
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extern int arm_elf_section_type (const char *, size_t);
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extern int tc_arm_regname_to_dw2regnum (char *regname);
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extern void tc_arm_frame_initial_instructions (void);
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#ifdef TE_PE
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||
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||
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#define O_secrel O_md1
|
||
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||
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#define TC_DWARF2_EMIT_OFFSET tc_pe_dwarf2_emit_offset
|
||
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void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
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||
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||
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#endif /* TE_PE */
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||
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||
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#ifdef OBJ_ELF
|
||
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#define CONVERT_SYMBOLIC_ATTRIBUTE(name) arm_convert_symbolic_attribute (name)
|
||
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extern int arm_convert_symbolic_attribute (const char *);
|
||
|
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extern int arm_apply_sym_value (struct fix *, segT);
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||
|
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#endif
|
||
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|
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|
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#define tc_comment_chars arm_comment_chars
|
||
|
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extern char arm_comment_chars[];
|
||
|
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|
||
|
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#define tc_line_separator_chars arm_line_separator_chars
|
||
|
|
extern char arm_line_separator_chars[];
|
||
|
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|
||
|
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#define TC_EQUAL_IN_INSN(c, s) arm_tc_equal_in_insn ((c), (s))
|
||
|
|
extern bool arm_tc_equal_in_insn (int, char *);
|
||
|
|
|
||
|
|
#define TC_LARGEST_EXPONENT_IS_NORMAL(PRECISION) \
|
||
|
|
arm_is_largest_exponent_ok ((PRECISION))
|
||
|
|
int arm_is_largest_exponent_ok (int precision);
|