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https://github.com/autc04/Retro68.git
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165 lines
3.9 KiB
C
165 lines
3.9 KiB
C
/* OpenRISC opcode support. -*- C -*-
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Copyright 2000, 2001, 2003, 2005, 2011 Free Software Foundation, Inc.
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Contributed by Red Hat Inc;
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This file is part of the GNU Binutils.
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This program 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 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* This file is an addendum to or32.cpu. Heavy use of C code isn't
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appropriate in .cpu files, so it resides here. This especially applies
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to assembly/disassembly where parsing/printing can be quite involved.
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Such things aren't really part of the specification of the cpu, per se,
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so .cpu files provide the general framework and .opc files handle the
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nitty-gritty details as necessary.
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Each section is delimited with start and end markers.
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<arch>-opc.h additions use: "-- opc.h"
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<arch>-opc.c additions use: "-- opc.c"
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<arch>-asm.c additions use: "-- asm.c"
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<arch>-dis.c additions use: "-- dis.c"
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<arch>-ibd.h additions use: "-- ibd.h" */
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/* -- opc.h */
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#undef CGEN_DIS_HASH_SIZE
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#define CGEN_DIS_HASH_SIZE 64
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#undef CGEN_DIS_HASH
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#define CGEN_DIS_HASH(buffer, value) (((unsigned char *) (buffer))[0] >> 2)
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extern long openrisc_sign_extend_16bit (long);
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/* -- */
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/* -- opc.c */
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/* -- */
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/* -- asm.c */
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static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
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#define CGEN_VERBOSE_ASSEMBLER_ERRORS
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long
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openrisc_sign_extend_16bit (long value)
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{
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return ((value & 0xffff) ^ 0x8000) - 0x8000;
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}
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/* Handle hi(). */
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static const char *
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parse_hi16 (CGEN_CPU_DESC cd, const char ** strp, int opindex, long * valuep)
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{
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const char *errmsg;
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enum cgen_parse_operand_result result_type;
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unsigned long ret;
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if (**strp == '#')
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++*strp;
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if (strncasecmp (*strp, "hi(", 3) == 0)
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{
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bfd_vma value;
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*strp += 3;
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errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
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& result_type, & value);
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if (**strp != ')')
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return MISSING_CLOSING_PARENTHESIS;
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++*strp;
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if (errmsg == NULL
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&& result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
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value >>= 16;
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ret = value;
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}
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else
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{
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if (**strp == '-')
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{
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long value;
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errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value);
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ret = value;
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}
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else
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{
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unsigned long value;
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errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
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ret = value;
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}
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}
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*valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000;
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return errmsg;
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}
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/* Handle lo(). */
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static const char *
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parse_lo16 (CGEN_CPU_DESC cd, const char ** strp, int opindex, long * valuep)
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{
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const char *errmsg;
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enum cgen_parse_operand_result result_type;
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unsigned long ret;
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if (**strp == '#')
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++*strp;
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if (strncasecmp (*strp, "lo(", 3) == 0)
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{
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bfd_vma value;
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*strp += 3;
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errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
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& result_type, & value);
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if (**strp != ')')
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return MISSING_CLOSING_PARENTHESIS;
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++*strp;
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ret = value;
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}
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else
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{
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if (**strp == '-')
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{
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long value;
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errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value);
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ret = value;
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}
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else
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{
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unsigned long value;
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errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
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ret = value;
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}
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}
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*valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000;
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return errmsg;
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}
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/* -- */
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/* -- ibd.h */
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extern long openrisc_sign_extend_16bit (long);
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/* -- */
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