235 lines
8.1 KiB
C
235 lines
8.1 KiB
C
/* tc-mmix.h -- Header file for tc-mmix.c.
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Copyright (C) 2001-2020 Free Software Foundation, Inc.
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Written by Hans-Peter Nilsson (hp@bitrange.com).
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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_MMIX
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/* See gas/doc/internals.texi for explanation of these macros. */
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#define TARGET_FORMAT "elf64-mmix"
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#define TARGET_ARCH bfd_arch_mmix
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#define TARGET_BYTES_BIG_ENDIAN 1
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extern const char mmix_comment_chars[];
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#define tc_comment_chars mmix_comment_chars
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extern const char mmix_symbol_chars[];
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#define tc_symbol_chars mmix_symbol_chars
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/* "@" is a synonym for ".". */
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#define LEX_AT (LEX_BEGIN_NAME)
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extern int mmix_label_without_colon_this_line (void);
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#define LABELS_WITHOUT_COLONS mmix_label_without_colon_this_line ()
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extern int mmix_next_semicolon_is_eoln;
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#define TC_EOL_IN_INSN(p) (*(p) == ';' && ! mmix_next_semicolon_is_eoln)
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/* This is one direction we can get mmixal compatibility. */
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extern void mmix_handle_mmixal (void);
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#define md_start_line_hook mmix_handle_mmixal
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extern void mmix_md_begin (void);
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#define md_begin mmix_md_begin
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extern void mmix_md_end (void);
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#define md_end mmix_md_end
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extern int mmix_current_location \
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(void (*fn) (expressionS *), expressionS *);
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extern int mmix_parse_predefined_name (char *, expressionS *);
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extern char *mmix_current_prefix;
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/* A bit ugly, since we "know" that there's a static function
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current_location that does what we want. We also strip off a leading
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':' in another ugly way.
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The [DVWIOUZX]_Handler symbols are provided when-used. */
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extern int mmix_gnu_syntax;
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#define md_parse_name(name, exp, mode, cpos) \
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(! mmix_gnu_syntax \
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&& (name[0] == '@' \
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? (! is_part_of_name (name[1]) \
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&& mmix_current_location (current_location, exp)) \
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: ((name[0] == ':' || ISUPPER (name[0])) \
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&& mmix_parse_predefined_name (name, exp))))
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extern char *mmix_prefix_name (char *);
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/* We implement when *creating* a symbol, we also need to strip a ':' or
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prepend a prefix. */
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#define tc_canonicalize_symbol_name(x) \
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(mmix_current_prefix == NULL && (x)[0] != ':' ? (x) : mmix_prefix_name (x))
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#define md_undefined_symbol(x) NULL
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extern void mmix_fb_label (expressionS *);
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/* Since integer_constant is local to expr.c, we have to make this a
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macro. FIXME: Do it cleaner. */
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#define md_operand(exp) \
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do \
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{ \
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if (input_line_pointer[0] == '#') \
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{ \
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input_line_pointer++; \
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integer_constant (16, (exp)); \
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} \
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else if (input_line_pointer[0] == '&' \
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&& input_line_pointer[1] != '&') \
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as_bad (_("`&' serial number operator is not supported")); \
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else \
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mmix_fb_label (exp); \
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} \
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while (0)
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/* Gas dislikes the 2ADD, 8ADD etc. insns, so we have to assemble them in
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the error-recovery loop. Hopefully there are no significant
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differences. Also, space on a line isn't gracefully handled. */
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extern int mmix_assemble_return_nonzero (char *);
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#define tc_unrecognized_line(c) \
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((c) == ' ' \
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|| (((c) == '1' || (c) == '2' || (c) == '4' || (c) == '8') \
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&& mmix_assemble_return_nonzero (input_line_pointer - 1)))
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#define md_number_to_chars number_to_chars_bigendian
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#define WORKING_DOT_WORD
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extern const struct relax_type mmix_relax_table[];
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#define TC_GENERIC_RELAX_TABLE mmix_relax_table
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/* We use the relax table for everything except the GREG frags and PUSHJ. */
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extern long mmix_md_relax_frag (segT, fragS *, long);
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#define md_relax_frag mmix_md_relax_frag
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#define tc_fix_adjustable(FIX) \
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(((FIX)->fx_addsy == NULL \
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|| S_GET_SEGMENT ((FIX)->fx_addsy) != reg_section) \
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&& (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT \
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&& (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY \
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&& (FIX)->fx_r_type != BFD_RELOC_MMIX_LOCAL)
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/* Adjust symbols which are registers. */
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#define tc_adjust_symtab() mmix_adjust_symtab ()
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extern void mmix_adjust_symtab (void);
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/* Here's where we make all symbols global, when so requested.
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We must avoid doing that for expression symbols or section symbols,
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though. */
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extern int mmix_globalize_symbols;
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#define tc_frob_symbol(sym, punt) \
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do \
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{ \
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if (S_GET_SEGMENT (sym) == reg_section) \
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{ \
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if (S_GET_NAME (sym)[0] != '$' \
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&& S_GET_VALUE (sym) < 256) \
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{ \
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if (mmix_globalize_symbols) \
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S_SET_EXTERNAL (sym); \
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else \
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symbol_mark_used_in_reloc (sym); \
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} \
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} \
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else if (mmix_globalize_symbols \
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&& ! symbol_section_p (sym) \
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&& sym != section_symbol (absolute_section) \
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&& ! S_IS_LOCAL (sym)) \
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S_SET_EXTERNAL (sym); \
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} \
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while (0)
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/* No shared lib support, so we don't need to ensure externally
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visible symbols can be overridden. */
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#define EXTERN_FORCE_RELOC 0
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/* When relaxing, we need to emit various relocs we otherwise wouldn't. */
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#define TC_FORCE_RELOCATION(fix) mmix_force_relocation (fix)
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extern int mmix_force_relocation (struct fix *);
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/* Call md_pcrel_from_section(), not md_pcrel_from(). */
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#define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
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extern long md_pcrel_from_section (struct fix *, segT);
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#define md_section_align(seg, size) (size)
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#define LISTING_HEADER "GAS for MMIX"
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/* The default of 4 means Bcc expansion looks like it's missing a line. */
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#define LISTING_LHS_CONT_LINES 5
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extern fragS *mmix_opcode_frag;
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#define TC_FRAG_TYPE fragS *
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#define TC_FRAG_INIT(frag, max_bytes) (frag)->tc_frag_data = mmix_opcode_frag
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/* We need to associate each section symbol with a list of GREGs defined
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for that section/segment and sorted on offset, between the point where
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all symbols have been evaluated and all frags mapped, and when the
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fixups are done and relocs are output. Similarly for each unknown
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symbol. */
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extern void mmix_frob_file (void);
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#define tc_frob_file_before_fix() \
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do \
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{ \
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int i = 0; \
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\
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/* It's likely mmix_frob_file changed (removed) sections, so make \
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sure sections are correctly numbered as per renumber_sections, \
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(static to write.c where this macro is called). */ \
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mmix_frob_file (); \
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bfd_map_over_sections (stdoutput, renumber_sections, &i); \
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} \
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while (0)
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/* Used by mmix_frob_file. Hangs on section symbols and unknown symbols. */
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struct mmix_symbol_gregs;
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#define TC_SYMFIELD_TYPE struct mmix_symbol_gregs *
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/* Used by relaxation, counting maximum needed PUSHJ stubs for a section. */
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struct mmix_segment_info_type
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{
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/* We only need to keep track of the last stubbable frag because
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there's no less hackish way to keep track of different relaxation
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rounds. */
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fragS *last_stubfrag;
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bfd_size_type nstubs;
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};
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#define TC_SEGMENT_INFO_TYPE struct mmix_segment_info_type
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extern void mmix_md_elf_section_change_hook (void);
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#define md_elf_section_change_hook mmix_md_elf_section_change_hook
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extern void mmix_md_do_align (int, char *, int, int);
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#define md_do_align(n, fill, len, max, label) \
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mmix_md_do_align (n, fill, len, max)
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/* Each insn is a tetrabyte (4 bytes) long, but if there are BYTE
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sequences sprinkled in, we can get unaligned DWARF2 offsets, so let's
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explicitly say one byte. */
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#define DWARF2_LINE_MIN_INSN_LENGTH 1
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/* This target is buggy, and sets fix size too large. */
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#define TC_FX_SIZE_SLACK(FIX) 6
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/* MMIX has global register symbols. */
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#define TC_GLOBAL_REGISTER_SYMBOL_OK
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