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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/*
* picasm -- pic12bit.c
*/
#include <stdio.h>
#include "picasm.h"
/*
* Assemble 12-bit PIC code
*
*/
int
assemble_12bit_mnemonic(int op)
{
long val;
struct symbol *sym;
char *cp;
int t, symtype;
switch(op) {
case KW_ANDLW:
case KW_IORLW:
case KW_XORLW:
val = get_expression();
if(expr_error)
return FAIL;
if(val < -0x80 || val > 0xff)
error(1, "8-bit literal out of range");
val &= 0xff; /* this assumes 2-complement negative numbers */
switch(op) {
case KW_ANDLW: gen_code(0xe00 | val); break;
case KW_IORLW: gen_code(0xd00 | val); break;
case KW_XORLW: gen_code(0xf00 | val); break;
}
break;
case KW_MOVLW:
if(gen_byte_c(0xc00) != OK)
return FAIL;
break;
case KW_ADDWF:
case KW_SUBWF:
case KW_ANDWF:
case KW_IORWF:
case KW_XORWF:
case KW_COMF:
case KW_DECF:
case KW_INCF:
case KW_MOVF:
case KW_DECFSZ:
case KW_INCFSZ:
case KW_RLF:
case KW_RRF:
case KW_SWAPF:
val = get_expression();
if(expr_error)
return FAIL;
if(val < 0 || val > 0x1f)
error(0, "Register file address out of range");
t = 1;
if(token_type == TOK_COMMA) {
get_token();
t = get_expression();
if(expr_error)
return FAIL;
} else {
if(warnmode)
warning("Destination speficier omitted");
}
val = (val & 0x1f) | (t != 0 ? 0x20 : 0);
switch(op) {
case KW_ADDWF: gen_code(0x1c0 | val); break;
case KW_SUBWF: gen_code(0x080 | val); break;
case KW_ANDWF: gen_code(0x140 | val); break;
case KW_IORWF: gen_code(0x100 | val); break;
case KW_XORWF: gen_code(0x180 | val); break;
case KW_COMF: gen_code(0x240 | val); break;
case KW_DECF: gen_code(0x0c0 | val); break;
case KW_INCF: gen_code(0x280 | val); break;
case KW_MOVF: gen_code(0x200 | val); break;
case KW_DECFSZ: gen_code(0x2c0 | val); break;
case KW_INCFSZ: gen_code(0x3c0 | val); break;
case KW_RLF: gen_code(0x340 | val); break;
case KW_RRF: gen_code(0x300 | val); break;
case KW_SWAPF: gen_code(0x380 | val); break;
}
break;
case KW_CLRF:
case KW_MOVWF:
val = get_expression();
if(expr_error)
return FAIL;
if(val < 0 || val > 0x1f)
error(0, "Register file address out of range");
switch(op) {
case KW_CLRF: gen_code(0x060 | val); break;
case KW_MOVWF: gen_code(0x020 | val); break;
}
break;
case KW_BCF:
case KW_BSF:
case KW_BTFSC:
case KW_BTFSS:
val = get_expression();
if(expr_error)
return FAIL;
if(val < 0 || val > 0x1f)
error(0, "Register file address out of range");
if(token_type != TOK_COMMA) {
error(1, "',' expected");
return FAIL;
}
get_token();
t = get_expression();
if(expr_error)
return FAIL;
if(t < 0 || t > 7) {
error(0, "Bit number out of range");
}
val |= (t << 5);
switch(op) {
case KW_BCF: gen_code(0x400 | val); break;
case KW_BSF: gen_code(0x500 | val); break;
case KW_BTFSC: gen_code(0x600 | val); break;
case KW_BTFSS: gen_code(0x700 | val); break;
}
break;
case KW_CALL:
case KW_GOTO:
t = 0;
if(token_type == TOK_IDENTIFIER || token_type == TOK_LOCAL_ID) {
symtype =
(token_type == TOK_IDENTIFIER ? SYMTAB_GLOBAL : SYMTAB_LOCAL);
if(symtype == SYMTAB_LOCAL && local_level == 0) {
error(1, "Local symbol outside a LOCAL block");
return FAIL;
}
sym = lookup_symbol(token_string, symtype);
if(sym == NULL || sym->type == SYM_FORWARD) {
if(sym == NULL) {
sym = add_symbol(token_string, symtype);
sym->type = SYM_FORWARD;
}
val = 0;
add_patch(symtype, sym,
(op == KW_CALL ? PATCH8 : PATCH9));
t = 1;
get_token();
goto gen_goto_call;
}
}
val = get_expression();
if(expr_error)
return FAIL;
if(val < 0 || val >= prog_mem_size)
error(0, "GOTO/CALL address out of range");
if(op == KW_CALL && (val & 0x100) != 0)
error(0, "CALL address in upper half of a page");
gen_goto_call:
switch(op) {
case KW_CALL: gen_code(0x900 | (val & 0xff)); break;
case KW_GOTO: gen_code(0xa00 | (val & 0x1ff)); break;
}
if(t)
list_flags |= LIST_FORWARD;
break;
case KW_TRIS:
t = get_expression();
if(expr_error)
return FAIL;
if(t != 5 && t != 6 && t != 7)
error(0, "Invalid register address for TRIS");
gen_code(0x000 | t);
break;
/*
* RETLW allows multiple parameters/strings, for generating lookup tables
*/
case KW_RETLW:
for(;;) {
if(token_type == TOK_STRCONST) {
for(cp = token_string; *cp != '\0'; cp++)
gen_code(0x800 | (int)((unsigned char)(*cp)));
get_token();
} else {
if(gen_byte_c(0x800) != OK)
return FAIL;
}
if(token_type != TOK_COMMA)
break;
get_token();
}
break;
case KW_NOP:
gen_code(0x000);
break;
case KW_CLRW:
gen_code(0x040);
break;
case KW_OPTION:
gen_code(0x002);
break;
case KW_SLEEP:
gen_code(0x003);
break;
case KW_CLRWDT:
gen_code(0x004);
break;
case KW_RETURN:
case KW_RETFIE:
case KW_ADDLW:
case KW_SUBLW:
error(1, "Unimplemented instruction for PIC%s", pic_type->name);
return FAIL;
default:
error(1, "Syntax error");
return FAIL;
}
return OK;
}
|
