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206 lines
6.9 KiB
C
206 lines
6.9 KiB
C
/* tc-i960.h - Basic 80960 instruction formats.
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Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1998, 1999,
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2000, 2002, 2003
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Free Software Foundation, Inc.
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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
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published by the Free Software Foundation; either version 2,
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or (at your option) any later version.
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GAS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the 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, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef TC_I960
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#define TC_I960 1
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#ifdef OBJ_ELF
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#define TARGET_FORMAT "elf32-i960"
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#define TARGET_ARCH bfd_arch_i960
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#endif
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#define TARGET_BYTES_BIG_ENDIAN 0
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#define WORKING_DOT_WORD
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/*
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* The 'COJ' instructions are actually COBR instructions with the 'b' in
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* the mnemonic replaced by a 'j'; they are ALWAYS "de-optimized" if necessary:
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* if the displacement will not fit in 13 bits, the assembler will replace them
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* with the corresponding compare and branch instructions.
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*
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* All of the 'MEMn' instructions are the same format; the 'n' in the name
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* indicates the default index scale factor (the size of the datum operated on).
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*
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* The FBRA formats are not actually an instruction format. They are the
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* "convenience directives" for branching on floating-point comparisons,
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* each of which generates 2 instructions (a 'bno' and one other branch).
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*
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* The CALLJ format is not actually an instruction format. It indicates that
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* the instruction generated (a CTRL-format 'call') should have its relocation
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* specially flagged for link-time replacement with a 'bal' or 'calls' if
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* appropriate.
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*/
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/* tailor gas */
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#define SYMBOLS_NEED_BACKPOINTERS
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#define LOCAL_LABELS_FB 1
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#define BITFIELD_CONS_EXPRESSIONS
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/* tailor the coff format */
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#define BFD_ARCH bfd_arch_i960
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#define COFF_FLAGS F_AR32WR
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#define COFF_MAGIC I960ROMAGIC
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#define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT
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#define OBJ_COFF_MAX_AUXENTRIES (2)
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#define TC_COUNT_RELOC(FIX) (!(FIX)->fx_done)
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#define TC_COFF_FIX2RTYPE(FIX) tc_coff_fix2rtype (FIX)
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#define TC_COFF_SIZEMACHDEP(FRAGP) tc_coff_sizemachdep (FRAGP)
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#define TC_COFF_SET_MACHINE(HDRS) tc_headers_hook (HDRS)
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extern int tc_coff_sizemachdep PARAMS ((struct frag *));
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/* MEANING OF 'n_other' in the symbol record.
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*
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* If non-zero, the 'n_other' fields indicates either a leaf procedure or
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* a system procedure, as follows:
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*
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* 1 <= n_other <= 32 :
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* The symbol is the entry point to a system procedure.
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* 'n_value' is the address of the entry, as for any other
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* procedure. The system procedure number (which can be used in
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* a 'calls' instruction) is (n_other-1). These entries come from
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* '.sysproc' directives.
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*
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* n_other == N_CALLNAME
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* the symbol is the 'call' entry point to a leaf procedure.
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* The *next* symbol in the symbol table must be the corresponding
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* 'bal' entry point to the procedure (see following). These
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* entries come from '.leafproc' directives in which two different
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* symbols are specified (the first one is represented here).
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*
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*
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* n_other == N_BALNAME
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* the symbol is the 'bal' entry point to a leaf procedure.
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* These entries result from '.leafproc' directives in which only
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* one symbol is specified, or in which the same symbol is
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* specified twice.
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*
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* Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
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* but not every N_BALNAME entry must have an N_CALLNAME entry.
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*/
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#define N_CALLNAME ((char)-1)
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#define N_BALNAME ((char)-2)
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/* i960 uses a custom relocation record. */
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/* let obj-aout.h know */
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#define CUSTOM_RELOC_FORMAT 1
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/* let aout_gnu.h know */
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#define N_RELOCATION_INFO_DECLARED 1
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struct relocation_info
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{
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int r_address; /* File address of item to be relocated */
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unsigned
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r_index:24, /* Index of symbol on which relocation is based*/
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r_pcrel:1, /* 1 => relocate PC-relative; else absolute
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* On i960, pc-relative implies 24-bit
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* address, absolute implies 32-bit.
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*/
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r_length:2, /* Number of bytes to relocate:
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* 0 => 1 byte
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* 1 => 2 bytes
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* 2 => 4 bytes -- only value used for i960
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*/
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r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */
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r_disp:1, /* Something for the GNU NS32K assembler */
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r_callj:1, /* 1 if relocation target is an i960 'callj' */
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nuthin:1; /* Unused */
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};
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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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/* Makes no sense to use the difference of 2 arbitrary symbols
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as the target of a call instruction. */
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#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
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((FIX)->fx_tcbit \
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|| ! SEG_NORMAL (SEG) \
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|| TC_FORCE_RELOCATION (FIX))
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/* reloc_callj() may replace a 'call' with a 'calls' or a
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'bal', in which cases it modifies *fixP as appropriate.
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In the case of a 'calls', no further work is required. */
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extern int reloc_callj PARAMS ((struct fix *));
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#define TC_FORCE_RELOCATION_ABS(FIX) \
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(TC_FORCE_RELOCATION (FIX) \
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|| reloc_callj (FIX))
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#define TC_FORCE_RELOCATION_LOCAL(FIX) \
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(!(FIX)->fx_pcrel \
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|| (FIX)->fx_plt \
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|| TC_FORCE_RELOCATION (FIX) \
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|| reloc_callj (FIX))
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#ifdef OBJ_COFF
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/* We store the bal information in the sy_tc field. */
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#define TC_SYMFIELD_TYPE symbolS *
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#define TC_ADJUST_RELOC_COUNT(FIX,COUNT) \
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{ fixS *tcfixp = (FIX); \
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for (;tcfixp;tcfixp=tcfixp->fx_next) \
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if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \
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++(COUNT); \
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}
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#endif
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extern int i960_validate_fix PARAMS ((struct fix *, segT));
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#define TC_VALIDATE_FIX(FIX,SEGTYPE,LABEL) \
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if (!i960_validate_fix (FIX, SEGTYPE)) goto LABEL
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#define tc_fix_adjustable(FIX) ((FIX)->fx_bsr == 0)
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#ifndef OBJ_ELF
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/* Values passed to md_apply_fix3 sometimes include symbol values. */
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#define MD_APPLY_SYM_VALUE(FIX) tc_fix_adjustable (FIX)
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#else
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/* Values passed to md_apply_fix3 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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extern void brtab_emit PARAMS ((void));
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#define md_end() brtab_emit ()
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extern void tc_set_bal_of_call PARAMS ((symbolS *, symbolS *));
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extern struct symbol *tc_get_bal_of_call PARAMS ((symbolS *));
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extern void i960_handle_align PARAMS ((struct frag *));
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#define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG)
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#define NEED_FX_R_TYPE
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#define NO_RELOC -1
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#define md_operand(x)
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extern const struct relax_type md_relax_table[];
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#define TC_GENERIC_RELAX_TABLE md_relax_table
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#define LINKER_RELAXING_SHRINKS_ONLY
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#define TC_FIX_TYPE struct { unsigned bsr : 1; }
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#define fx_bsr tc_fix_data.bsr
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#define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0)
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#endif
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