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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
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19990502 sourceware importbinu_ss_19990502
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+/* 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 */