source: mainline/src/debug/print.c@ 73838ed

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 73838ed was e83a9f7, checked in by Josef Cejka <malyzelenyhnus@…>, 21 years ago

Created fmath as basic tool for IEEE 754 floating point numbers.
Added option $F for printf for printing "double" type.
  • Property mode set to 100644
File size: 8.4 KB
Line 
1/*
2 * Copyright (C) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <putchar.h>
30#include <print.h>
31#include <synch/spinlock.h>
32#include <arch/arg.h>
33#include <arch/asm.h>
34#include <arch/fmath.h>
35
36#include <arch.h>
37
38static char digits[] = "0123456789abcdef"; /**< Hexadecimal characters */
39static spinlock_t printflock; /**< printf spinlock */
40
41#define DEFAULT_DOUBLE_PRECISION 16
42#define DEFAULT_DOUBLE_BUFFER_SIZE 128
43
44void print_double(double num, __u16 precision)
45{
46 double intval,intval2;
47 int counter;
48 int exponent,exponenttmp;
49 unsigned char buf[DEFAULT_DOUBLE_BUFFER_SIZE];
50 unsigned long in1,in2;
51 /*
52 if (fmath_is_nan(num)) {
53 print_str("NaN");
54 return;
55 }
56 */
57
58 if (fmath_is_negative(num)) {
59 putchar('-');
60 }
61
62 num=fmath_abs(num);
63
64 /*
65 if (fmath_is_infinity(num)) {
66 print_str("Inf");
67 }
68 */
69 //TODO: rounding constant - when we got fraction >= 0.5, we must increment last printed number
70
71 /* Here is problem with cumulative error while printing big double values -> we will divide
72 the number with a power of 10, print new number with better method for small numbers and then print decimal point at correct position */
73
74 fmath_fint(fmath_get_decimal_exponent(num),&intval);
75
76 exponent=(intval>0.0?intval:0);
77
78 precision+=exponent;
79
80 if (exponent>0) num = num / ((fmath_dpow(10.0,exponent)));
81
82 num=fmath_fint(num,&intval);
83
84 if (precision>0) {
85 counter=precision-1;
86 if (exponent>0) counter++;
87
88 if (counter>=DEFAULT_DOUBLE_BUFFER_SIZE) {
89 counter=DEFAULT_DOUBLE_BUFFER_SIZE;
90 }
91 exponenttmp=exponent;
92 while(counter>=0) {
93 num *= 10.0;
94 num = fmath_fint(num,&intval2);
95 buf[counter--]=((int)intval2)+'0';
96 exponenttmp--;
97 if ((exponenttmp==0)&&(counter>=0)) buf[counter--]='.';
98 }
99 counter=precision;
100 if ((exponent==0)&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) buf[counter]='.';
101 counter++;
102 } else {
103 counter=0;
104 }
105
106 if (intval==0.0) {
107 if (counter<DEFAULT_DOUBLE_BUFFER_SIZE) buf[counter++]='0';
108 } else {
109 in1=intval;
110 while(( in1>0 )&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) {
111
112 in2=in1;
113 in1/=10;
114 buf[counter]=in2-in1*10 + '0';
115 counter++;
116 }
117 }
118
119 counter = (counter>=DEFAULT_DOUBLE_BUFFER_SIZE?DEFAULT_DOUBLE_BUFFER_SIZE:counter);
120 while (counter>0) {
121 putchar(buf[--counter]);
122 };
123 return;
124}
125
126/** Print NULL terminated string
127 *
128 * Print characters from str using putchar() until
129 * \x00 character is reached.
130 *
131 * @param str Characters to print.
132 *
133 */
134void print_str(const char *str)
135{
136 int i = 0;
137 char c;
138
139 while (c = str[i++])
140 putchar(c);
141}
142
143
144/** Print hexadecimal digits
145 *
146 * Print fixed count of hexadecimal digits from
147 * the number num. The digits are printed in
148 * natural left-to-right order starting with
149 * the width-th digit.
150 *
151 * @param num Number containing digits.
152 * @param width Count of digits to print.
153 *
154 */
155void print_fixed_hex(const __u64 num, const int width)
156{
157 int i;
158
159 for (i = width*8 - 4; i >= 0; i -= 4)
160 putchar(digits[(num>>i) & 0xf]);
161}
162
163
164/** Print number in given base
165 *
166 * Print significant digits of a number in given
167 * base.
168 *
169 * @param num Number to print.
170 * @param base Base to print the number in (should
171 * be in range 2 .. 16).
172 *
173 */
174void print_number(const __native num, const unsigned int base)
175{
176 int val = num;
177 char d[sizeof(__native)*8+1]; /* this is good enough even for base == 2 */
178 int i = sizeof(__native)*8-1;
179
180 do {
181 d[i--] = digits[val % base];
182 } while (val /= base);
183
184 d[sizeof(__native)*8] = 0;
185 print_str(&d[i + 1]);
186}
187
188
189/** General formatted text print
190 *
191 * Print text formatted according the fmt parameter
192 * and variant arguments. Each formatting directive
193 * begins with % (percentage) character and one of the
194 * following character:
195 *
196 * % Prints the percentage character.
197 * s The next variant argument is treated as char*
198 * and printed as a NULL terminated string.
199 * c The next variant argument is treated as a single char.
200 * p The next variant argument is treated as a maximum
201 * bit-width integer with respect to architecture
202 * and printed in full hexadecimal width.
203 * P As with 'p', but '0x' is prefixed.
204 * q The next variant argument is treated as a 64b integer
205 * and printed in full hexadecimal width.
206 * Q As with 'q', but '0x' is prefixed.
207 * l The next variant argument is treated as a 32b integer
208 * and printed in full hexadecimal width.
209 * L As with 'l', but '0x' is prefixed.
210 * w The next variant argument is treated as a 16b integer
211 * and printed in full hexadecimal width.
212 * W As with 'w', but '0x' is prefixed.
213 * b The next variant argument is treated as a 8b integer
214 * and printed in full hexadecimal width.
215 * N As with 'b', but '0x' is prefixed.
216 * d The next variant argument is treated as integer
217 * and printed in standard decimal format (only significant
218 * digits).
219 * x The next variant argument is treated as integer
220 * and printed in standard hexadecimal format (only significant
221 * digits).
222 * X As with 'x', but '0x' is prefixed.
223 *
224 * All other characters from fmt except the formatting directives
225 * are printed in verbatim.
226 *
227 * @param fmt Formatting NULL terminated string.
228 *
229 */
230void printf(const char *fmt, ...)
231{
232 int irqpri, i = 0;
233 va_list ap;
234 char c;
235
236 va_start(ap, fmt);
237
238 irqpri = cpu_priority_high();
239 spinlock_lock(&printflock);
240
241 while (c = fmt[i++]) {
242 switch (c) {
243
244 /* control character */
245 case '%':
246 switch (c = fmt[i++]) {
247
248 /* percentile itself */
249 case '%':
250 break;
251
252 /*
253 * String and character conversions.
254 */
255 case 's':
256 print_str(va_arg(ap, char_ptr));
257 goto loop;
258
259 case 'c':
260 c = (char) va_arg(ap, int);
261 break;
262
263 /*
264 * Hexadecimal conversions with fixed width.
265 */
266 case 'P':
267 print_str("0x");
268 case 'p':
269 print_fixed_hex(va_arg(ap, __native), sizeof(__native));
270 goto loop;
271
272 case 'Q':
273 print_str("0x");
274 case 'q':
275 print_fixed_hex(va_arg(ap, __u64), INT64);
276 goto loop;
277
278 case 'L':
279 print_str("0x");
280 case 'l':
281 print_fixed_hex(va_arg(ap, __native), INT32);
282 goto loop;
283
284 case 'W':
285 print_str("0x");
286 case 'w':
287 print_fixed_hex(va_arg(ap, __native), INT16);
288 goto loop;
289
290 case 'B':
291 print_str("0x");
292 case 'b':
293 print_fixed_hex(va_arg(ap, __native), INT8);
294 goto loop;
295
296 /*
297 * Floating point conversions.
298 */
299
300 case 'F':
301 case 'f':
302 print_double(va_arg(ap, double),DEFAULT_DOUBLE_PRECISION);
303 goto loop;
304 /*
305 * Decimal and hexadecimal conversions.
306 */
307 case 'd':
308 print_number(va_arg(ap, __native), 10);
309 goto loop;
310
311 case 'X':
312 print_str("0x");
313 case 'x':
314 print_number(va_arg(ap, __native), 16);
315 goto loop;
316
317 /*
318 * Bad formatting.
319 */
320 default:
321 goto out;
322 }
323
324 default: putchar(c);
325 }
326
327loop:
328 ;
329 }
330
331out:
332 spinlock_unlock(&printflock);
333 cpu_priority_restore(irqpri);
334
335 va_end(ap);
336}
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