source: mainline/src/debug/print.c@ 3156582

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3156582 was b0edf3b2, checked in by Jakub Jermar <jakub@…>, 20 years ago

Add comments for new floating point modifiers to print.c.
Remove left-over comments from AMD64 and IA-32 page.c.
Coding style clean up.
  • Property mode set to 100644
File size: 9.8 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, __u8 modifier, __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
53 if (fmath_is_nan(num)) {
54 print_str("NaN");
55 return;
56 }
57
58 if (num<0.0) {
59 putchar('-');
60 num=num*-1.0;
61 }
62
63
64 if (fmath_is_infinity(num)) {
65 print_str("Inf");
66 return;
67 }
68
69 if ((modifier=='E')||(modifier=='e')) {
70 intval2=fmath_fint(fmath_get_decimal_exponent(num),&intval);
71 exponent=intval;
72 if ((intval2<0.0)) exponent--;
73 num = num / ((fmath_dpow(10.0,exponent)));
74
75 print_double(num,modifier+1,precision); /* modifier+1 = E => F or e => f */
76 putchar(modifier);
77 if (exponent<0) {
78 putchar('-');
79 exponent*=-1;
80 }
81 print_number(exponent,10);
82 return;
83 }
84
85 /* TODO: rounding constant - when we got fraction >= 0.5, we must increment last printed number */
86
87 /*
88 * Here is a problem with cumulative error while printing big double values -> we will divide
89 * the number with a power of 10, print new number with better method for small numbers and
90 * then print decimal point at correct position.
91 */
92
93 fmath_fint(fmath_get_decimal_exponent(num),&intval);
94
95 exponent=(intval>0.0?intval:0);
96
97 precision+=exponent;
98
99 if (exponent>0) num = num / ((fmath_dpow(10.0,exponent)));
100
101 num=fmath_fint(num,&intval);
102
103 if (precision>0) {
104 counter=precision-1;
105 if (exponent>0) counter++;
106
107 if (counter>=DEFAULT_DOUBLE_BUFFER_SIZE) {
108 counter=DEFAULT_DOUBLE_BUFFER_SIZE;
109 }
110 exponenttmp=exponent;
111 while(counter>=0) {
112 num *= 10.0;
113 num = fmath_fint(num,&intval2);
114 buf[counter--]=((int)intval2)+'0';
115 exponenttmp--;
116 if ((exponenttmp==0)&&(counter>=0)) buf[counter--]='.';
117 }
118 counter=precision;
119 if ((exponent==0)&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) buf[counter]='.';
120 counter++;
121 } else {
122 counter=0;
123 }
124
125 in1=intval;
126 if (in1==0.0) {
127 if (counter<DEFAULT_DOUBLE_BUFFER_SIZE) buf[counter++]='0';
128 } else {
129 while(( in1>0 )&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) {
130
131 in2=in1;
132 in1/=10;
133 buf[counter]=in2-in1*10 + '0';
134 counter++;
135 }
136 }
137
138 counter = (counter>=DEFAULT_DOUBLE_BUFFER_SIZE?DEFAULT_DOUBLE_BUFFER_SIZE:counter);
139 while (counter>0) {
140 putchar(buf[--counter]);
141 }
142 return;
143}
144
145/** Print NULL terminated string
146 *
147 * Print characters from str using putchar() until
148 * \x00 character is reached.
149 *
150 * @param str Characters to print.
151 *
152 */
153void print_str(const char *str)
154{
155 int i = 0;
156 char c;
157
158 while (c = str[i++])
159 putchar(c);
160}
161
162
163/** Print hexadecimal digits
164 *
165 * Print fixed count of hexadecimal digits from
166 * the number num. The digits are printed in
167 * natural left-to-right order starting with
168 * the width-th digit.
169 *
170 * @param num Number containing digits.
171 * @param width Count of digits to print.
172 *
173 */
174void print_fixed_hex(const __u64 num, const int width)
175{
176 int i;
177
178 for (i = width*8 - 4; i >= 0; i -= 4)
179 putchar(digits[(num>>i) & 0xf]);
180}
181
182
183/** Print number in given base
184 *
185 * Print significant digits of a number in given
186 * base.
187 *
188 * @param num Number to print.
189 * @param base Base to print the number in (should
190 * be in range 2 .. 16).
191 *
192 */
193void print_number(const __native num, const unsigned int base)
194{
195 int val = num;
196 char d[sizeof(__native)*8+1]; /* this is good enough even for base == 2 */
197 int i = sizeof(__native)*8-1;
198
199 do {
200 d[i--] = digits[val % base];
201 } while (val /= base);
202
203 d[sizeof(__native)*8] = 0;
204 print_str(&d[i + 1]);
205}
206
207
208/** General formatted text print
209 *
210 * Print text formatted according the fmt parameter
211 * and variant arguments. Each formatting directive
212 * begins with % (percentage) character and one of the
213 * following character:
214 *
215 * % Prints the percentage character.
216 * s The next variant argument is treated as char*
217 * and printed as a NULL terminated string.
218 * c The next variant argument is treated as a single char.
219 * p The next variant argument is treated as a maximum
220 * bit-width integer with respect to architecture
221 * and printed in full hexadecimal width.
222 * P As with 'p', but '0x' is prefixed.
223 * q The next variant argument is treated as a 64b integer
224 * and printed in full hexadecimal width.
225 * Q As with 'q', but '0x' is prefixed.
226 * l The next variant argument is treated as a 32b integer
227 * and printed in full hexadecimal width.
228 * L As with 'l', but '0x' is prefixed.
229 * w The next variant argument is treated as a 16b integer
230 * and printed in full hexadecimal width.
231 * W As with 'w', but '0x' is prefixed.
232 * b The next variant argument is treated as a 8b integer
233 * and printed in full hexadecimal width.
234 * N As with 'b', but '0x' is prefixed.
235 * d The next variant argument is treated as integer
236 * and printed in standard decimal format (only significant
237 * digits).
238 * x The next variant argument is treated as integer
239 * and printed in standard hexadecimal format (only significant
240 * digits).
241 * X As with 'x', but '0x' is prefixed.
242 * . The decimal number following period will be treated as precision
243 * for printing floating point numbers. One of 'e', 'E', 'f' or 'F'
244 * must follow.
245 * e The next variant argument is treated as double precision float
246 * and printed in exponent notation with only one digit before decimal point
247 * in specified precision. The exponent sign is printed as 'e'.
248 * E As with 'e', but the exponent sign is printed as 'E'.
249 * f The next variant argument is treated as double precision float
250 * and printed in decimal notation in specified precision.
251 * F As with 'f'.
252 *
253 * All other characters from fmt except the formatting directives
254 * are printed in verbatim.
255 *
256 * @param fmt Formatting NULL terminated string.
257 *
258 */
259void printf(const char *fmt, ...)
260{
261 int irqpri, i = 0;
262 va_list ap;
263 char c;
264
265 __u16 precision;
266
267 va_start(ap, fmt);
268
269 irqpri = cpu_priority_high();
270 spinlock_lock(&printflock);
271
272 while (c = fmt[i++]) {
273 switch (c) {
274
275 /* control character */
276 case '%':
277 precision = DEFAULT_DOUBLE_PRECISION;
278 if (fmt[i]=='.') {
279 precision=0;
280 c=fmt[++i];
281 while((c>='0')&&(c<='9')) {
282 precision = precision*10 + c - '0';
283 c=fmt[++i];
284 }
285 }
286
287 switch (c = fmt[i++]) {
288
289 /* percentile itself */
290 case '%':
291 break;
292
293 /*
294 * String and character conversions.
295 */
296 case 's':
297 print_str(va_arg(ap, char_ptr));
298 goto loop;
299
300 case 'c':
301 c = (char) va_arg(ap, int);
302 break;
303
304 /*
305 * Hexadecimal conversions with fixed width.
306 */
307 case 'P':
308 print_str("0x");
309 case 'p':
310 print_fixed_hex(va_arg(ap, __native), sizeof(__native));
311 goto loop;
312
313 case 'Q':
314 print_str("0x");
315 case 'q':
316 print_fixed_hex(va_arg(ap, __u64), INT64);
317 goto loop;
318
319 case 'L':
320 print_str("0x");
321 case 'l':
322 print_fixed_hex(va_arg(ap, __native), INT32);
323 goto loop;
324
325 case 'W':
326 print_str("0x");
327 case 'w':
328 print_fixed_hex(va_arg(ap, __native), INT16);
329 goto loop;
330
331 case 'B':
332 print_str("0x");
333 case 'b':
334 print_fixed_hex(va_arg(ap, __native), INT8);
335 goto loop;
336
337 /*
338 * Floating point conversions.
339 */
340 case 'F':
341 print_double(va_arg(ap, double),'F',precision);
342 goto loop;
343
344 case 'f':
345 print_double(va_arg(ap, double),'f',precision);
346 goto loop;
347
348 case 'E':
349 print_double(va_arg(ap, double),'E',precision);
350 goto loop;
351 case 'e':
352 print_double(va_arg(ap, double),'e',precision);
353 goto loop;
354
355 /*
356 * Decimal and hexadecimal conversions.
357 */
358 case 'd':
359 print_number(va_arg(ap, __native), 10);
360 goto loop;
361
362 case 'X':
363 print_str("0x");
364 case 'x':
365 print_number(va_arg(ap, __native), 16);
366 goto loop;
367
368 /*
369 * Bad formatting.
370 */
371 default:
372 goto out;
373 }
374
375 default: putchar(c);
376 }
377
378loop:
379 ;
380 }
381
382out:
383 spinlock_unlock(&printflock);
384 cpu_priority_restore(irqpri);
385
386 va_end(ap);
387}
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