| 1 | /* XSTORMY16 opcode support. -*- C -*- |
| 2 | Copyright 2011 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Red Hat Inc; |
| 5 | |
| 6 | This file is part of the GNU Binutils. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | /* This file is an addendum to xstormy16.cpu. Heavy use of C code isn't |
| 24 | appropriate in .cpu files, so it resides here. This especially applies |
| 25 | to assembly/disassembly where parsing/printing can be quite involved. |
| 26 | Such things aren't really part of the specification of the cpu, per se, |
| 27 | so .cpu files provide the general framework and .opc files handle the |
| 28 | nitty-gritty details as necessary. |
| 29 | |
| 30 | Each section is delimited with start and end markers. |
| 31 | |
| 32 | <arch>-opc.h additions use: "-- opc.h" |
| 33 | <arch>-opc.c additions use: "-- opc.c" |
| 34 | <arch>-asm.c additions use: "-- asm.c" |
| 35 | <arch>-dis.c additions use: "-- dis.c" |
| 36 | <arch>-ibd.h additions use: "-- ibd.h". */ |
| 37 | \f |
| 38 | /* -- opc.h */ |
| 39 | |
| 40 | /* Allows reason codes to be output when assembler errors occur. */ |
| 41 | #define CGEN_VERBOSE_ASSEMBLER_ERRORS |
| 42 | |
| 43 | /* We can't use the default hash size because many bits are used by |
| 44 | operands. */ |
| 45 | #define CGEN_DIS_HASH_SIZE 1 |
| 46 | #define CGEN_DIS_HASH(buf, value) 0 |
| 47 | /* -- */ |
| 48 | \f |
| 49 | /* -- asm.c */ |
| 50 | |
| 51 | /* The machine-independent code doesn't know how to disambiguate |
| 52 | mov (foo),r3 |
| 53 | and |
| 54 | mov (r2),r3 |
| 55 | where 'foo' is a label. This helps it out. */ |
| 56 | |
| 57 | static const char * |
| 58 | parse_mem8 (CGEN_CPU_DESC cd, |
| 59 | const char **strp, |
| 60 | int opindex, |
| 61 | unsigned long *valuep) |
| 62 | { |
| 63 | if (**strp == '(') |
| 64 | { |
| 65 | const char *s = *strp; |
| 66 | |
| 67 | if (s[1] == '-' && s[2] == '-') |
| 68 | return _("Bad register in preincrement"); |
| 69 | |
| 70 | while (ISALNUM (*++s)) |
| 71 | ; |
| 72 | if (s[0] == '+' && s[1] == '+' && (s[2] == ')' || s[2] == ',')) |
| 73 | return _("Bad register in postincrement"); |
| 74 | if (s[0] == ',' || s[0] == ')') |
| 75 | return _("Bad register name"); |
| 76 | } |
| 77 | else if (cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, |
| 78 | (long *) valuep) == NULL) |
| 79 | return _("Label conflicts with register name"); |
| 80 | else if (strncasecmp (*strp, "rx,", 3) == 0 |
| 81 | || strncasecmp (*strp, "rxl,", 3) == 0 |
| 82 | || strncasecmp (*strp, "rxh,", 3) == 0) |
| 83 | return _("Label conflicts with `Rx'"); |
| 84 | else if (**strp == '#') |
| 85 | return _("Bad immediate expression"); |
| 86 | |
| 87 | return cgen_parse_unsigned_integer (cd, strp, opindex, valuep); |
| 88 | } |
| 89 | |
| 90 | /* For the add and subtract instructions, there are two immediate forms, |
| 91 | one for small operands and one for large ones. We want to use |
| 92 | the small one when possible, but we do not want to generate relocs |
| 93 | of the small size. This is somewhat tricky. */ |
| 94 | |
| 95 | static const char * |
| 96 | parse_small_immediate (CGEN_CPU_DESC cd, |
| 97 | const char **strp, |
| 98 | int opindex, |
| 99 | unsigned long *valuep) |
| 100 | { |
| 101 | bfd_vma value; |
| 102 | enum cgen_parse_operand_result result; |
| 103 | const char *errmsg; |
| 104 | |
| 105 | if (**strp == '@') |
| 106 | return _("No relocation for small immediate"); |
| 107 | |
| 108 | errmsg = (* cd->parse_operand_fn) |
| 109 | (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE, |
| 110 | & result, & value); |
| 111 | |
| 112 | if (errmsg) |
| 113 | return errmsg; |
| 114 | |
| 115 | if (result != CGEN_PARSE_OPERAND_RESULT_NUMBER) |
| 116 | return _("Small operand was not an immediate number"); |
| 117 | |
| 118 | *valuep = value; |
| 119 | return NULL; |
| 120 | } |
| 121 | |
| 122 | /* Literal scan be either a normal literal, a @hi() or @lo relocation. */ |
| 123 | |
| 124 | static const char * |
| 125 | parse_immediate16 (CGEN_CPU_DESC cd, |
| 126 | const char **strp, |
| 127 | int opindex, |
| 128 | unsigned long *valuep) |
| 129 | { |
| 130 | const char *errmsg; |
| 131 | enum cgen_parse_operand_result result; |
| 132 | bfd_reloc_code_real_type code = BFD_RELOC_NONE; |
| 133 | bfd_vma value; |
| 134 | |
| 135 | if (strncmp (*strp, "@hi(", 4) == 0) |
| 136 | { |
| 137 | *strp += 4; |
| 138 | code = BFD_RELOC_HI16; |
| 139 | } |
| 140 | else |
| 141 | if (strncmp (*strp, "@lo(", 4) == 0) |
| 142 | { |
| 143 | *strp += 4; |
| 144 | code = BFD_RELOC_LO16; |
| 145 | } |
| 146 | |
| 147 | if (code == BFD_RELOC_NONE) |
| 148 | errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep); |
| 149 | else |
| 150 | { |
| 151 | errmsg = cgen_parse_address (cd, strp, opindex, code, &result, &value); |
| 152 | if ((errmsg == NULL) && |
| 153 | (result != CGEN_PARSE_OPERAND_RESULT_QUEUED)) |
| 154 | errmsg = _("Operand is not a symbol"); |
| 155 | |
| 156 | *valuep = value; |
| 157 | if ((code == BFD_RELOC_HI16 || code == BFD_RELOC_LO16) |
| 158 | && **strp == ')') |
| 159 | *strp += 1; |
| 160 | else |
| 161 | { |
| 162 | errmsg = _("Syntax error: No trailing ')'"); |
| 163 | return errmsg; |
| 164 | } |
| 165 | } |
| 166 | return errmsg; |
| 167 | } |
| 168 | /* -- */ |