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Diffstat (limited to 'gas/config/tc-i960.h')
| -rw-r--r-- | gas/config/tc-i960.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/gas/config/tc-i960.h b/gas/config/tc-i960.h new file mode 100644 index 0000000..f606967 --- /dev/null +++ b/gas/config/tc-i960.h @@ -0,0 +1,171 @@ +/* tc-i960.h - Basic 80960 instruction formats. + Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 96, 97, 1998 + 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 2, + 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, 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#ifndef TC_I960 +#define TC_I960 1 + +#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 SYMBOLS_NEED_BACKPOINTERS +#define LOCAL_LABELS_FB 1 +#define BITFIELD_CONS_EXPRESSIONS + +/* tailor the coff format */ +#define BFD_ARCH bfd_arch_i960 +#define COFF_FLAGS F_AR32WR +#define COFF_MAGIC I960ROMAGIC +#define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT +#define OBJ_COFF_MAX_AUXENTRIES (2) +#define TC_COUNT_RELOC(FIXP) (!(FIXP)->fx_done) +#define TC_COFF_FIX2RTYPE(FIXP) tc_coff_fix2rtype(FIXP) +#define TC_COFF_SIZEMACHDEP(FRAGP) tc_coff_sizemachdep(FRAGP) +#define TC_COFF_SET_MACHINE(HDRS) tc_headers_hook (HDRS) +extern void tc_headers_hook (); +extern short tc_coff_fix2rtype (); +extern int tc_coff_sizemachdep (); + +/* 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 */ + }; + +#ifdef OBJ_COFF + +/* We store the bal information in the sy_tc field. */ +#define TC_SYMFIELD_TYPE struct symbol * + +#define TC_ADJUST_RELOC_COUNT(FIXP,COUNT) \ + { fixS *tcfixp = (FIXP); \ + for (;tcfixp;tcfixp=tcfixp->fx_next) \ + if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \ + ++(COUNT); \ + } +#endif + +extern int i960_validate_fix PARAMS ((struct fix *, segT, struct symbol **)); +#define TC_VALIDATE_FIX(FIXP,SEGTYPE,LABEL) \ + if (i960_validate_fix (FIXP, SEGTYPE, &add_symbolP) != 0) goto LABEL + +#define tc_fix_adjustable(FIXP) ((FIXP)->fx_bsr == 0) + +extern void brtab_emit PARAMS ((void)); +#define md_end() brtab_emit () + +extern void reloc_callj (); + +extern void tc_set_bal_of_call PARAMS ((struct symbol *, struct symbol *)); + +extern struct symbol *tc_get_bal_of_call PARAMS ((struct symbol *)); + +extern void i960_handle_align (); +#define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG) +#define NEED_FX_R_TYPE +#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 + +/* end of tc-i960.h */ |