1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/* XSTORMY16 opcode support. -*- C -*-
Copyright 2011 Free Software Foundation, Inc.
Contributed by Red Hat Inc;
This file is part of the GNU Binutils.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* This file is an addendum to xstormy16.cpu. Heavy use of C code isn't
appropriate in .cpu files, so it resides here. This especially applies
to assembly/disassembly where parsing/printing can be quite involved.
Such things aren't really part of the specification of the cpu, per se,
so .cpu files provide the general framework and .opc files handle the
nitty-gritty details as necessary.
Each section is delimited with start and end markers.
<arch>-opc.h additions use: "-- opc.h"
<arch>-opc.c additions use: "-- opc.c"
<arch>-asm.c additions use: "-- asm.c"
<arch>-dis.c additions use: "-- dis.c"
<arch>-ibd.h additions use: "-- ibd.h". */
/* -- opc.h */
/* Allows reason codes to be output when assembler errors occur. */
#define CGEN_VERBOSE_ASSEMBLER_ERRORS
/* We can't use the default hash size because many bits are used by
operands. */
#define CGEN_DIS_HASH_SIZE 1
#define CGEN_DIS_HASH(buf, value) 0
/* -- */
/* -- asm.c */
/* The machine-independent code doesn't know how to disambiguate
mov (foo),r3
and
mov (r2),r3
where 'foo' is a label. This helps it out. */
static const char *
parse_mem8 (CGEN_CPU_DESC cd,
const char **strp,
int opindex,
unsigned long *valuep)
{
if (**strp == '(')
{
const char *s = *strp;
if (s[1] == '-' && s[2] == '-')
return _("Bad register in preincrement");
while (ISALNUM (*++s))
;
if (s[0] == '+' && s[1] == '+' && (s[2] == ')' || s[2] == ','))
return _("Bad register in postincrement");
if (s[0] == ',' || s[0] == ')')
return _("Bad register name");
}
else if (cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names,
(long *) valuep) == NULL)
return _("Label conflicts with register name");
else if (strncasecmp (*strp, "rx,", 3) == 0
|| strncasecmp (*strp, "rxl,", 3) == 0
|| strncasecmp (*strp, "rxh,", 3) == 0)
return _("Label conflicts with `Rx'");
else if (**strp == '#')
return _("Bad immediate expression");
return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
}
/* For the add and subtract instructions, there are two immediate forms,
one for small operands and one for large ones. We want to use
the small one when possible, but we do not want to generate relocs
of the small size. This is somewhat tricky. */
static const char *
parse_small_immediate (CGEN_CPU_DESC cd,
const char **strp,
int opindex,
unsigned long *valuep)
{
bfd_vma value;
enum cgen_parse_operand_result result;
const char *errmsg;
if (**strp == '@')
return _("No relocation for small immediate");
errmsg = (* cd->parse_operand_fn)
(cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
& result, & value);
if (errmsg)
return errmsg;
if (result != CGEN_PARSE_OPERAND_RESULT_NUMBER)
return _("Small operand was not an immediate number");
*valuep = value;
return NULL;
}
/* Literal scan be either a normal literal, a @hi() or @lo relocation. */
static const char *
parse_immediate16 (CGEN_CPU_DESC cd,
const char **strp,
int opindex,
unsigned long *valuep)
{
const char *errmsg;
enum cgen_parse_operand_result result;
bfd_reloc_code_real_type code = BFD_RELOC_NONE;
bfd_vma value;
if (strncmp (*strp, "@hi(", 4) == 0)
{
*strp += 4;
code = BFD_RELOC_HI16;
}
else
if (strncmp (*strp, "@lo(", 4) == 0)
{
*strp += 4;
code = BFD_RELOC_LO16;
}
if (code == BFD_RELOC_NONE)
errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
else
{
errmsg = cgen_parse_address (cd, strp, opindex, code, &result, &value);
if ((errmsg == NULL) &&
(result != CGEN_PARSE_OPERAND_RESULT_QUEUED))
errmsg = _("Operand is not a symbol");
*valuep = value;
if ((code == BFD_RELOC_HI16 || code == BFD_RELOC_LO16)
&& **strp == ')')
*strp += 1;
else
{
errmsg = _("Syntax error: No trailing ')'");
return errmsg;
}
}
return errmsg;
}
/* -- */
|
