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/* tc-i960.h - Basic 80960 instruction formats.
Copyright (C) 1989-2014 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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,
or (at your option) any later version.
GAS 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 GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#ifndef TC_I960
#define TC_I960 1
#ifdef OBJ_ELF
#define TARGET_FORMAT "elf32-i960"
#define TARGET_ARCH bfd_arch_i960
#endif
#define TARGET_BYTES_BIG_ENDIAN 0
#define WORKING_DOT_WORD
/*
* The 'COJ' instructions are actually COBR instructions with the 'b' in
* the mnemonic replaced by a 'j'; they are ALWAYS "de-optimized" if necessary:
* if the displacement will not fit in 13 bits, the assembler will replace them
* with the corresponding compare and branch instructions.
*
* All of the 'MEMn' instructions are the same format; the 'n' in the name
* indicates the default index scale factor (the size of the datum operated on).
*
* The FBRA formats are not actually an instruction format. They are the
* "convenience directives" for branching on floating-point comparisons,
* each of which generates 2 instructions (a 'bno' and one other branch).
*
* The CALLJ format is not actually an instruction format. It indicates that
* the instruction generated (a CTRL-format 'call') should have its relocation
* specially flagged for link-time replacement with a 'bal' or 'calls' if
* appropriate.
*/
/* tailor gas */
#define LOCAL_LABELS_FB 1
#define BITFIELD_CONS_EXPRESSIONS
/* tailor the coff format */
#define COFF_MAGIC I960ROMAGIC
#define OBJ_COFF_MAX_AUXENTRIES (2)
/* MEANING OF 'n_other' in the symbol record.
*
* If non-zero, the 'n_other' fields indicates either a leaf procedure or
* a system procedure, as follows:
*
* 1 <= n_other <= 32 :
* The symbol is the entry point to a system procedure.
* 'n_value' is the address of the entry, as for any other
* procedure. The system procedure number (which can be used in
* a 'calls' instruction) is (n_other-1). These entries come from
* '.sysproc' directives.
*
* n_other == N_CALLNAME
* the symbol is the 'call' entry point to a leaf procedure.
* The *next* symbol in the symbol table must be the corresponding
* 'bal' entry point to the procedure (see following). These
* entries come from '.leafproc' directives in which two different
* symbols are specified (the first one is represented here).
*
*
* n_other == N_BALNAME
* the symbol is the 'bal' entry point to a leaf procedure.
* These entries result from '.leafproc' directives in which only
* one symbol is specified, or in which the same symbol is
* specified twice.
*
* Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
* but not every N_BALNAME entry must have an N_CALLNAME entry.
*/
#define N_CALLNAME ((char)-1)
#define N_BALNAME ((char)-2)
/* i960 uses a custom relocation record. */
/* let obj-aout.h know */
#define CUSTOM_RELOC_FORMAT 1
/* let aout_gnu.h know */
#define N_RELOCATION_INFO_DECLARED 1
struct relocation_info
{
int r_address; /* File address of item to be relocated */
unsigned
r_index:24, /* Index of symbol on which relocation is based*/
r_pcrel:1, /* 1 => relocate PC-relative; else absolute
* On i960, pc-relative implies 24-bit
* address, absolute implies 32-bit.
*/
r_length:2, /* Number of bytes to relocate:
* 0 => 1 byte
* 1 => 2 bytes
* 2 => 4 bytes -- only value used for i960
*/
r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */
r_disp:1, /* Something for the GNU NS32K assembler */
r_callj:1, /* 1 if relocation target is an i960 'callj' */
nuthin:1; /* Unused */
};
/* No shared lib support, so we don't need to ensure externally
visible symbols can be overridden. */
#define EXTERN_FORCE_RELOC 0
/* Makes no sense to use the difference of 2 arbitrary symbols
as the target of a call instruction. */
#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
((FIX)->fx_tcbit \
|| ! SEG_NORMAL (SEG) \
|| TC_FORCE_RELOCATION (FIX))
/* reloc_callj() may replace a 'call' with a 'calls' or a
'bal', in which cases it modifies *fixP as appropriate.
In the case of a 'calls', no further work is required. */
extern int reloc_callj (struct fix *);
#define TC_FORCE_RELOCATION_ABS(FIX) \
(TC_FORCE_RELOCATION (FIX) \
|| reloc_callj (FIX))
#define TC_FORCE_RELOCATION_LOCAL(FIX) \
(!(FIX)->fx_pcrel \
|| TC_FORCE_RELOCATION (FIX) \
|| reloc_callj (FIX))
#ifdef OBJ_COFF
/* We store the bal information in the sy_tc field. */
#define TC_SYMFIELD_TYPE symbolS *
#endif
extern int i960_validate_fix (struct fix *, segT);
#define TC_VALIDATE_FIX(FIX,SEGTYPE,LABEL) \
if (!i960_validate_fix (FIX, SEGTYPE)) goto LABEL
#define tc_fix_adjustable(FIX) ((FIX)->fx_bsr == 0)
#ifndef OBJ_ELF
/* Values passed to md_apply_fix sometimes include symbol values. */
#define MD_APPLY_SYM_VALUE(FIX) tc_fix_adjustable (FIX)
#else
/* Values passed to md_apply_fix don't include the symbol value. */
#define MD_APPLY_SYM_VALUE(FIX) 0
#endif
extern void brtab_emit (void);
#define md_end() brtab_emit ()
extern void tc_set_bal_of_call (symbolS *, symbolS *);
extern struct symbol *tc_get_bal_of_call (symbolS *);
extern void i960_handle_align (struct frag *);
#define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG)
#define NO_RELOC -1
#define md_operand(x)
extern const struct relax_type md_relax_table[];
#define TC_GENERIC_RELAX_TABLE md_relax_table
#define LINKER_RELAXING_SHRINKS_ONLY
#define TC_FIX_TYPE struct { unsigned bsr : 1; }
#define fx_bsr tc_fix_data.bsr
#define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0)
#endif
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