1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
10 * Wirzenius wrote this portably, Torvalds fucked it up :-)
14 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
15 * - changed to provide snprintf and vsnprintf functions
16 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
17 * - scnprintf and vscnprintf
21 #include <linux/build_bug.h>
22 #include <linux/clk.h>
23 #include <linux/clk-provider.h>
24 #include <linux/errname.h>
25 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */
26 #include <linux/types.h>
27 #include <linux/string.h>
28 #include <linux/ctype.h>
29 #include <linux/kernel.h>
30 #include <linux/kallsyms.h>
31 #include <linux/math64.h>
32 #include <linux/uaccess.h>
33 #include <linux/ioport.h>
34 #include <linux/dcache.h>
35 #include <linux/cred.h>
36 #include <linux/rtc.h>
37 #include <linux/time.h>
38 #include <linux/uuid.h>
40 #include <net/addrconf.h>
41 #include <linux/siphash.h>
42 #include <linux/compiler.h>
43 #include <linux/property.h>
45 #include <linux/blkdev.h>
48 #include "../mm/internal.h" /* For the trace_print_flags arrays */
50 #include <asm/page.h> /* for PAGE_SIZE */
51 #include <asm/byteorder.h> /* cpu_to_le16 */
53 #include <linux/string_helpers.h>
56 static unsigned long long simple_strntoull(const char *startp, size_t max_chars,
57 char **endp, unsigned int base)
60 unsigned long long result = 0ULL;
64 cp = _parse_integer_fixup_radix(startp, &base);
65 prefix_chars = cp - startp;
66 if (prefix_chars < max_chars) {
67 rv = _parse_integer_limit(cp, base, &result, max_chars - prefix_chars);
69 cp += (rv & ~KSTRTOX_OVERFLOW);
71 /* Field too short for prefix + digit, skip over without converting */
72 cp = startp + max_chars;
82 * simple_strtoull - convert a string to an unsigned long long
83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
87 * This function has caveats. Please use kstrtoull instead.
90 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
92 return simple_strntoull(cp, INT_MAX, endp, base);
94 EXPORT_SYMBOL(simple_strtoull);
97 * simple_strtoul - convert a string to an unsigned long
98 * @cp: The start of the string
99 * @endp: A pointer to the end of the parsed string will be placed here
100 * @base: The number base to use
102 * This function has caveats. Please use kstrtoul instead.
104 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
106 return simple_strtoull(cp, endp, base);
108 EXPORT_SYMBOL(simple_strtoul);
111 * simple_strtol - convert a string to a signed long
112 * @cp: The start of the string
113 * @endp: A pointer to the end of the parsed string will be placed here
114 * @base: The number base to use
116 * This function has caveats. Please use kstrtol instead.
118 long simple_strtol(const char *cp, char **endp, unsigned int base)
121 return -simple_strtoul(cp + 1, endp, base);
123 return simple_strtoul(cp, endp, base);
125 EXPORT_SYMBOL(simple_strtol);
127 static long long simple_strntoll(const char *cp, size_t max_chars, char **endp,
131 * simple_strntoull() safely handles receiving max_chars==0 in the
132 * case cp[0] == '-' && max_chars == 1.
133 * If max_chars == 0 we can drop through and pass it to simple_strntoull()
134 * and the content of *cp is irrelevant.
136 if (*cp == '-' && max_chars > 0)
137 return -simple_strntoull(cp + 1, max_chars - 1, endp, base);
139 return simple_strntoull(cp, max_chars, endp, base);
143 * simple_strtoll - convert a string to a signed long long
144 * @cp: The start of the string
145 * @endp: A pointer to the end of the parsed string will be placed here
146 * @base: The number base to use
148 * This function has caveats. Please use kstrtoll instead.
150 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
152 return simple_strntoll(cp, INT_MAX, endp, base);
154 EXPORT_SYMBOL(simple_strtoll);
156 static noinline_for_stack
157 int skip_atoi(const char **s)
162 i = i*10 + *((*s)++) - '0';
163 } while (isdigit(**s));
169 * Decimal conversion is by far the most typical, and is used for
170 * /proc and /sys data. This directly impacts e.g. top performance
171 * with many processes running. We optimize it for speed by emitting
172 * two characters at a time, using a 200 byte lookup table. This
173 * roughly halves the number of multiplications compared to computing
174 * the digits one at a time. Implementation strongly inspired by the
175 * previous version, which in turn used ideas described at
176 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
177 * from the author, Douglas W. Jones).
179 * It turns out there is precisely one 26 bit fixed-point
180 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
181 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
182 * range happens to be somewhat larger (x <= 1073741898), but that's
183 * irrelevant for our purpose.
185 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
186 * need a 32x32->64 bit multiply, so we simply use the same constant.
188 * For dividing a number in the range [100, 10^4-1] by 100, there are
189 * several options. The simplest is (x * 0x147b) >> 19, which is valid
190 * for all x <= 43698.
193 static const u16 decpair[100] = {
194 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
195 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
196 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
197 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
198 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
199 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
200 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
201 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
202 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
203 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
204 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
209 * This will print a single '0' even if r == 0, since we would
210 * immediately jump to out_r where two 0s would be written but only
211 * one of them accounted for in buf. This is needed by ip4_string
212 * below. All other callers pass a non-zero value of r.
214 static noinline_for_stack
215 char *put_dec_trunc8(char *buf, unsigned r)
223 /* 100 <= r < 10^8 */
224 q = (r * (u64)0x28f5c29) >> 32;
225 *((u16 *)buf) = decpair[r - 100*q];
232 /* 100 <= q < 10^6 */
233 r = (q * (u64)0x28f5c29) >> 32;
234 *((u16 *)buf) = decpair[q - 100*r];
241 /* 100 <= r < 10^4 */
242 q = (r * 0x147b) >> 19;
243 *((u16 *)buf) = decpair[r - 100*q];
250 *((u16 *)buf) = decpair[r];
251 buf += r < 10 ? 1 : 2;
255 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
256 static noinline_for_stack
257 char *put_dec_full8(char *buf, unsigned r)
262 q = (r * (u64)0x28f5c29) >> 32;
263 *((u16 *)buf) = decpair[r - 100*q];
267 r = (q * (u64)0x28f5c29) >> 32;
268 *((u16 *)buf) = decpair[q - 100*r];
272 q = (r * 0x147b) >> 19;
273 *((u16 *)buf) = decpair[r - 100*q];
277 *((u16 *)buf) = decpair[q];
282 static noinline_for_stack
283 char *put_dec(char *buf, unsigned long long n)
285 if (n >= 100*1000*1000)
286 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
287 /* 1 <= n <= 1.6e11 */
288 if (n >= 100*1000*1000)
289 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
291 return put_dec_trunc8(buf, n);
294 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
297 put_dec_full4(char *buf, unsigned r)
302 q = (r * 0x147b) >> 19;
303 *((u16 *)buf) = decpair[r - 100*q];
306 *((u16 *)buf) = decpair[q];
310 * Call put_dec_full4 on x % 10000, return x / 10000.
311 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
312 * holds for all x < 1,128,869,999. The largest value this
313 * helper will ever be asked to convert is 1,125,520,955.
314 * (second call in the put_dec code, assuming n is all-ones).
316 static noinline_for_stack
317 unsigned put_dec_helper4(char *buf, unsigned x)
319 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
321 put_dec_full4(buf, x - q * 10000);
325 /* Based on code by Douglas W. Jones found at
326 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
327 * (with permission from the author).
328 * Performs no 64-bit division and hence should be fast on 32-bit machines.
331 char *put_dec(char *buf, unsigned long long n)
333 uint32_t d3, d2, d1, q, h;
335 if (n < 100*1000*1000)
336 return put_dec_trunc8(buf, n);
338 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
341 d3 = (h >> 16); /* implicit "& 0xffff" */
343 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
344 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
345 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
346 q = put_dec_helper4(buf, q);
348 q += 7671 * d3 + 9496 * d2 + 6 * d1;
349 q = put_dec_helper4(buf+4, q);
351 q += 4749 * d3 + 42 * d2;
352 q = put_dec_helper4(buf+8, q);
357 buf = put_dec_trunc8(buf, q);
358 else while (buf[-1] == '0')
367 * Convert passed number to decimal string.
368 * Returns the length of string. On buffer overflow, returns 0.
370 * If speed is not important, use snprintf(). It's easy to read the code.
372 int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
374 /* put_dec requires 2-byte alignment of the buffer. */
375 char tmp[sizeof(num) * 3] __aligned(2);
378 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
383 len = put_dec(tmp, num) - tmp;
386 if (len > size || width > size)
391 for (idx = 0; idx < width; idx++)
397 for (idx = 0; idx < len; ++idx)
398 buf[idx + width] = tmp[len - idx - 1];
403 #define SIGN 1 /* unsigned/signed, must be 1 */
404 #define LEFT 2 /* left justified */
405 #define PLUS 4 /* show plus */
406 #define SPACE 8 /* space if plus */
407 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
408 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
409 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
411 static_assert(ZEROPAD == ('0' - ' '));
412 static_assert(SMALL == ' ');
415 FORMAT_TYPE_NONE, /* Just a string part */
417 FORMAT_TYPE_PRECISION,
421 FORMAT_TYPE_PERCENT_CHAR,
423 FORMAT_TYPE_LONG_LONG,
437 unsigned int type:8; /* format_type enum */
438 signed int field_width:24; /* width of output field */
439 unsigned int flags:8; /* flags to number() */
440 unsigned int base:8; /* number base, 8, 10 or 16 only */
441 signed int precision:16; /* # of digits/chars */
443 static_assert(sizeof(struct printf_spec) == 8);
445 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
446 #define PRECISION_MAX ((1 << 15) - 1)
448 static noinline_for_stack
449 char *number(char *buf, char *end, unsigned long long num,
450 struct printf_spec spec)
452 /* put_dec requires 2-byte alignment of the buffer. */
453 char tmp[3 * sizeof(num)] __aligned(2);
456 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
458 bool is_zero = num == 0LL;
459 int field_width = spec.field_width;
460 int precision = spec.precision;
462 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
463 * produces same digits or (maybe lowercased) letters */
464 locase = (spec.flags & SMALL);
465 if (spec.flags & LEFT)
466 spec.flags &= ~ZEROPAD;
468 if (spec.flags & SIGN) {
469 if ((signed long long)num < 0) {
471 num = -(signed long long)num;
473 } else if (spec.flags & PLUS) {
476 } else if (spec.flags & SPACE) {
488 /* generate full string in tmp[], in reverse order */
491 tmp[i++] = hex_asc_upper[num] | locase;
492 else if (spec.base != 10) { /* 8 or 16 */
493 int mask = spec.base - 1;
499 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
502 } else { /* base 10 */
503 i = put_dec(tmp, num) - tmp;
506 /* printing 100 using %2d gives "100", not "00" */
509 /* leading space padding */
510 field_width -= precision;
511 if (!(spec.flags & (ZEROPAD | LEFT))) {
512 while (--field_width >= 0) {
524 /* "0x" / "0" prefix */
526 if (spec.base == 16 || !is_zero) {
531 if (spec.base == 16) {
533 *buf = ('X' | locase);
537 /* zero or space padding */
538 if (!(spec.flags & LEFT)) {
539 char c = ' ' + (spec.flags & ZEROPAD);
541 while (--field_width >= 0) {
547 /* hmm even more zero padding? */
548 while (i <= --precision) {
553 /* actual digits of result */
559 /* trailing space padding */
560 while (--field_width >= 0) {
569 static noinline_for_stack
570 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
572 struct printf_spec spec;
574 spec.type = FORMAT_TYPE_PTR;
575 spec.field_width = 2 + 2 * size; /* 0x + hex */
576 spec.flags = SPECIAL | SMALL | ZEROPAD;
580 return number(buf, end, num, spec);
583 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
586 if (buf >= end) /* nowhere to put anything */
589 if (size <= spaces) {
590 memset(buf, ' ', size);
594 if (len > size - spaces)
596 memmove(buf + spaces, buf, len);
598 memset(buf, ' ', spaces);
602 * Handle field width padding for a string.
603 * @buf: current buffer position
604 * @n: length of string
605 * @end: end of output buffer
606 * @spec: for field width and flags
607 * Returns: new buffer position after padding.
609 static noinline_for_stack
610 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
614 if (likely(n >= spec.field_width))
616 /* we want to pad the sucker */
617 spaces = spec.field_width - n;
618 if (!(spec.flags & LEFT)) {
619 move_right(buf - n, end, n, spaces);
630 /* Handle string from a well known address. */
631 static char *string_nocheck(char *buf, char *end, const char *s,
632 struct printf_spec spec)
635 int lim = spec.precision;
646 return widen_string(buf, len, end, spec);
649 static char *err_ptr(char *buf, char *end, void *ptr,
650 struct printf_spec spec)
652 int err = PTR_ERR(ptr);
653 const char *sym = errname(err);
656 return string_nocheck(buf, end, sym, spec);
659 * Somebody passed ERR_PTR(-1234) or some other non-existing
660 * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
661 * printing it as its decimal representation.
665 return number(buf, end, err, spec);
668 /* Be careful: error messages must fit into the given buffer. */
669 static char *error_string(char *buf, char *end, const char *s,
670 struct printf_spec spec)
673 * Hard limit to avoid a completely insane messages. It actually
674 * works pretty well because most error messages are in
675 * the many pointer format modifiers.
677 if (spec.precision == -1)
678 spec.precision = 2 * sizeof(void *);
680 return string_nocheck(buf, end, s, spec);
684 * Do not call any complex external code here. Nested printk()/vsprintf()
685 * might cause infinite loops. Failures might break printk() and would
688 static const char *check_pointer_msg(const void *ptr)
693 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
699 static int check_pointer(char **buf, char *end, const void *ptr,
700 struct printf_spec spec)
704 err_msg = check_pointer_msg(ptr);
706 *buf = error_string(*buf, end, err_msg, spec);
713 static noinline_for_stack
714 char *string(char *buf, char *end, const char *s,
715 struct printf_spec spec)
717 if (check_pointer(&buf, end, s, spec))
720 return string_nocheck(buf, end, s, spec);
723 static char *pointer_string(char *buf, char *end,
725 struct printf_spec spec)
729 if (spec.field_width == -1) {
730 spec.field_width = 2 * sizeof(ptr);
731 spec.flags |= ZEROPAD;
734 return number(buf, end, (unsigned long int)ptr, spec);
737 /* Make pointers available for printing early in the boot sequence. */
738 static int debug_boot_weak_hash __ro_after_init;
740 static int __init debug_boot_weak_hash_enable(char *str)
742 debug_boot_weak_hash = 1;
743 pr_info("debug_boot_weak_hash enabled\n");
746 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
748 static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
749 static siphash_key_t ptr_key __read_mostly;
751 static void enable_ptr_key_workfn(struct work_struct *work)
753 get_random_bytes(&ptr_key, sizeof(ptr_key));
754 /* Needs to run from preemptible context */
755 static_branch_disable(¬_filled_random_ptr_key);
758 static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
760 static void fill_random_ptr_key(struct random_ready_callback *unused)
762 /* This may be in an interrupt handler. */
763 queue_work(system_unbound_wq, &enable_ptr_key_work);
766 static struct random_ready_callback random_ready = {
767 .func = fill_random_ptr_key
770 static int __init initialize_ptr_random(void)
772 int key_size = sizeof(ptr_key);
775 /* Use hw RNG if available. */
776 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
777 static_branch_disable(¬_filled_random_ptr_key);
781 ret = add_random_ready_callback(&random_ready);
784 } else if (ret == -EALREADY) {
785 /* This is in preemptible context */
786 enable_ptr_key_workfn(&enable_ptr_key_work);
792 early_initcall(initialize_ptr_random);
794 /* Maps a pointer to a 32 bit unique identifier. */
795 static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
797 unsigned long hashval;
799 if (static_branch_unlikely(¬_filled_random_ptr_key))
803 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
805 * Mask off the first 32 bits, this makes explicit that we have
806 * modified the address (and 32 bits is plenty for a unique ID).
808 hashval = hashval & 0xffffffff;
810 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
812 *hashval_out = hashval;
816 int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
818 return __ptr_to_hashval(ptr, hashval_out);
821 static char *ptr_to_id(char *buf, char *end, const void *ptr,
822 struct printf_spec spec)
824 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
825 unsigned long hashval;
829 * Print the real pointer value for NULL and error pointers,
830 * as they are not actual addresses.
832 if (IS_ERR_OR_NULL(ptr))
833 return pointer_string(buf, end, ptr, spec);
835 /* When debugging early boot use non-cryptographically secure hash. */
836 if (unlikely(debug_boot_weak_hash)) {
837 hashval = hash_long((unsigned long)ptr, 32);
838 return pointer_string(buf, end, (const void *)hashval, spec);
841 ret = __ptr_to_hashval(ptr, &hashval);
843 spec.field_width = 2 * sizeof(ptr);
844 /* string length must be less than default_width */
845 return error_string(buf, end, str, spec);
848 return pointer_string(buf, end, (const void *)hashval, spec);
851 int kptr_restrict __read_mostly;
853 static noinline_for_stack
854 char *restricted_pointer(char *buf, char *end, const void *ptr,
855 struct printf_spec spec)
857 switch (kptr_restrict) {
859 /* Handle as %p, hash and do _not_ leak addresses. */
860 return ptr_to_id(buf, end, ptr, spec);
862 const struct cred *cred;
865 * kptr_restrict==1 cannot be used in IRQ context
866 * because its test for CAP_SYSLOG would be meaningless.
868 if (in_irq() || in_serving_softirq() || in_nmi()) {
869 if (spec.field_width == -1)
870 spec.field_width = 2 * sizeof(ptr);
871 return error_string(buf, end, "pK-error", spec);
875 * Only print the real pointer value if the current
876 * process has CAP_SYSLOG and is running with the
877 * same credentials it started with. This is because
878 * access to files is checked at open() time, but %pK
879 * checks permission at read() time. We don't want to
880 * leak pointer values if a binary opens a file using
881 * %pK and then elevates privileges before reading it.
883 cred = current_cred();
884 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
885 !uid_eq(cred->euid, cred->uid) ||
886 !gid_eq(cred->egid, cred->gid))
892 /* Always print 0's for %pK */
897 return pointer_string(buf, end, ptr, spec);
900 static noinline_for_stack
901 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
904 const char *array[4], *s;
905 const struct dentry *p;
910 case '2': case '3': case '4':
911 depth = fmt[1] - '0';
918 for (i = 0; i < depth; i++, d = p) {
919 if (check_pointer(&buf, end, d, spec)) {
924 p = READ_ONCE(d->d_parent);
925 array[i] = READ_ONCE(d->d_name.name);
934 for (n = 0; n != spec.precision; n++, buf++) {
946 return widen_string(buf, n, end, spec);
949 static noinline_for_stack
950 char *file_dentry_name(char *buf, char *end, const struct file *f,
951 struct printf_spec spec, const char *fmt)
953 if (check_pointer(&buf, end, f, spec))
956 return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
959 static noinline_for_stack
960 char *bdev_name(char *buf, char *end, struct block_device *bdev,
961 struct printf_spec spec, const char *fmt)
965 if (check_pointer(&buf, end, bdev, spec))
969 buf = string(buf, end, hd->disk_name, spec);
970 if (bdev->bd_partno) {
971 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
976 buf = number(buf, end, bdev->bd_partno, spec);
982 static noinline_for_stack
983 char *symbol_string(char *buf, char *end, void *ptr,
984 struct printf_spec spec, const char *fmt)
987 #ifdef CONFIG_KALLSYMS
988 char sym[KSYM_SYMBOL_LEN];
992 ptr = __builtin_extract_return_addr(ptr);
993 value = (unsigned long)ptr;
995 #ifdef CONFIG_KALLSYMS
997 sprint_backtrace(sym, value);
998 else if (*fmt != 's')
999 sprint_symbol(sym, value);
1001 sprint_symbol_no_offset(sym, value);
1003 return string_nocheck(buf, end, sym, spec);
1005 return special_hex_number(buf, end, value, sizeof(void *));
1009 static const struct printf_spec default_str_spec = {
1014 static const struct printf_spec default_flag_spec = {
1017 .flags = SPECIAL | SMALL,
1020 static const struct printf_spec default_dec_spec = {
1025 static const struct printf_spec default_dec02_spec = {
1032 static const struct printf_spec default_dec04_spec = {
1039 static noinline_for_stack
1040 char *resource_string(char *buf, char *end, struct resource *res,
1041 struct printf_spec spec, const char *fmt)
1043 #ifndef IO_RSRC_PRINTK_SIZE
1044 #define IO_RSRC_PRINTK_SIZE 6
1047 #ifndef MEM_RSRC_PRINTK_SIZE
1048 #define MEM_RSRC_PRINTK_SIZE 10
1050 static const struct printf_spec io_spec = {
1052 .field_width = IO_RSRC_PRINTK_SIZE,
1054 .flags = SPECIAL | SMALL | ZEROPAD,
1056 static const struct printf_spec mem_spec = {
1058 .field_width = MEM_RSRC_PRINTK_SIZE,
1060 .flags = SPECIAL | SMALL | ZEROPAD,
1062 static const struct printf_spec bus_spec = {
1066 .flags = SMALL | ZEROPAD,
1068 static const struct printf_spec str_spec = {
1074 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
1075 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
1076 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
1077 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
1078 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
1079 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
1080 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
1081 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
1083 char *p = sym, *pend = sym + sizeof(sym);
1084 int decode = (fmt[0] == 'R') ? 1 : 0;
1085 const struct printf_spec *specp;
1087 if (check_pointer(&buf, end, res, spec))
1091 if (res->flags & IORESOURCE_IO) {
1092 p = string_nocheck(p, pend, "io ", str_spec);
1094 } else if (res->flags & IORESOURCE_MEM) {
1095 p = string_nocheck(p, pend, "mem ", str_spec);
1097 } else if (res->flags & IORESOURCE_IRQ) {
1098 p = string_nocheck(p, pend, "irq ", str_spec);
1099 specp = &default_dec_spec;
1100 } else if (res->flags & IORESOURCE_DMA) {
1101 p = string_nocheck(p, pend, "dma ", str_spec);
1102 specp = &default_dec_spec;
1103 } else if (res->flags & IORESOURCE_BUS) {
1104 p = string_nocheck(p, pend, "bus ", str_spec);
1107 p = string_nocheck(p, pend, "??? ", str_spec);
1111 if (decode && res->flags & IORESOURCE_UNSET) {
1112 p = string_nocheck(p, pend, "size ", str_spec);
1113 p = number(p, pend, resource_size(res), *specp);
1115 p = number(p, pend, res->start, *specp);
1116 if (res->start != res->end) {
1118 p = number(p, pend, res->end, *specp);
1122 if (res->flags & IORESOURCE_MEM_64)
1123 p = string_nocheck(p, pend, " 64bit", str_spec);
1124 if (res->flags & IORESOURCE_PREFETCH)
1125 p = string_nocheck(p, pend, " pref", str_spec);
1126 if (res->flags & IORESOURCE_WINDOW)
1127 p = string_nocheck(p, pend, " window", str_spec);
1128 if (res->flags & IORESOURCE_DISABLED)
1129 p = string_nocheck(p, pend, " disabled", str_spec);
1131 p = string_nocheck(p, pend, " flags ", str_spec);
1132 p = number(p, pend, res->flags, default_flag_spec);
1137 return string_nocheck(buf, end, sym, spec);
1140 static noinline_for_stack
1141 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1144 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
1145 negative value, fallback to the default */
1148 if (spec.field_width == 0)
1149 /* nothing to print */
1152 if (check_pointer(&buf, end, addr, spec))
1170 if (spec.field_width > 0)
1171 len = min_t(int, spec.field_width, 64);
1173 for (i = 0; i < len; ++i) {
1175 *buf = hex_asc_hi(addr[i]);
1178 *buf = hex_asc_lo(addr[i]);
1181 if (separator && i != len - 1) {
1191 static noinline_for_stack
1192 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1193 struct printf_spec spec, const char *fmt)
1195 const int CHUNKSZ = 32;
1196 int nr_bits = max_t(int, spec.field_width, 0);
1200 if (check_pointer(&buf, end, bitmap, spec))
1203 /* reused to print numbers */
1204 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1206 chunksz = nr_bits & (CHUNKSZ - 1);
1210 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1211 for (; i >= 0; i -= CHUNKSZ) {
1215 chunkmask = ((1ULL << chunksz) - 1);
1216 word = i / BITS_PER_LONG;
1217 bit = i % BITS_PER_LONG;
1218 val = (bitmap[word] >> bit) & chunkmask;
1227 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1228 buf = number(buf, end, val, spec);
1235 static noinline_for_stack
1236 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1237 struct printf_spec spec, const char *fmt)
1239 int nr_bits = max_t(int, spec.field_width, 0);
1240 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
1241 int cur, rbot, rtop;
1244 if (check_pointer(&buf, end, bitmap, spec))
1247 rbot = cur = find_first_bit(bitmap, nr_bits);
1248 while (cur < nr_bits) {
1250 cur = find_next_bit(bitmap, nr_bits, cur + 1);
1251 if (cur < nr_bits && cur <= rtop + 1)
1261 buf = number(buf, end, rbot, default_dec_spec);
1267 buf = number(buf, end, rtop, default_dec_spec);
1275 static noinline_for_stack
1276 char *mac_address_string(char *buf, char *end, u8 *addr,
1277 struct printf_spec spec, const char *fmt)
1279 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
1283 bool reversed = false;
1285 if (check_pointer(&buf, end, addr, spec))
1302 for (i = 0; i < 6; i++) {
1304 p = hex_byte_pack(p, addr[5 - i]);
1306 p = hex_byte_pack(p, addr[i]);
1308 if (fmt[0] == 'M' && i != 5)
1313 return string_nocheck(buf, end, mac_addr, spec);
1316 static noinline_for_stack
1317 char *ip4_string(char *p, const u8 *addr, const char *fmt)
1320 bool leading_zeros = (fmt[0] == 'i');
1345 for (i = 0; i < 4; i++) {
1346 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
1347 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1348 if (leading_zeros) {
1354 /* reverse the digits in the quad */
1356 *p++ = temp[digits];
1366 static noinline_for_stack
1367 char *ip6_compressed_string(char *p, const char *addr)
1370 unsigned char zerolength[8];
1375 bool needcolon = false;
1377 struct in6_addr in6;
1379 memcpy(&in6, addr, sizeof(struct in6_addr));
1381 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1383 memset(zerolength, 0, sizeof(zerolength));
1390 /* find position of longest 0 run */
1391 for (i = 0; i < range; i++) {
1392 for (j = i; j < range; j++) {
1393 if (in6.s6_addr16[j] != 0)
1398 for (i = 0; i < range; i++) {
1399 if (zerolength[i] > longest) {
1400 longest = zerolength[i];
1404 if (longest == 1) /* don't compress a single 0 */
1408 for (i = 0; i < range; i++) {
1409 if (i == colonpos) {
1410 if (needcolon || i == 0)
1421 /* hex u16 without leading 0s */
1422 word = ntohs(in6.s6_addr16[i]);
1427 p = hex_byte_pack(p, hi);
1429 *p++ = hex_asc_lo(hi);
1430 p = hex_byte_pack(p, lo);
1433 p = hex_byte_pack(p, lo);
1435 *p++ = hex_asc_lo(lo);
1442 p = ip4_string(p, &in6.s6_addr[12], "I4");
1449 static noinline_for_stack
1450 char *ip6_string(char *p, const char *addr, const char *fmt)
1454 for (i = 0; i < 8; i++) {
1455 p = hex_byte_pack(p, *addr++);
1456 p = hex_byte_pack(p, *addr++);
1457 if (fmt[0] == 'I' && i != 7)
1465 static noinline_for_stack
1466 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1467 struct printf_spec spec, const char *fmt)
1469 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1471 if (fmt[0] == 'I' && fmt[2] == 'c')
1472 ip6_compressed_string(ip6_addr, addr);
1474 ip6_string(ip6_addr, addr, fmt);
1476 return string_nocheck(buf, end, ip6_addr, spec);
1479 static noinline_for_stack
1480 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1481 struct printf_spec spec, const char *fmt)
1483 char ip4_addr[sizeof("255.255.255.255")];
1485 ip4_string(ip4_addr, addr, fmt);
1487 return string_nocheck(buf, end, ip4_addr, spec);
1490 static noinline_for_stack
1491 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1492 struct printf_spec spec, const char *fmt)
1494 bool have_p = false, have_s = false, have_f = false, have_c = false;
1495 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1496 sizeof(":12345") + sizeof("/123456789") +
1497 sizeof("%1234567890")];
1498 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1499 const u8 *addr = (const u8 *) &sa->sin6_addr;
1500 char fmt6[2] = { fmt[0], '6' };
1504 while (isalpha(*++fmt)) {
1521 if (have_p || have_s || have_f) {
1526 if (fmt6[0] == 'I' && have_c)
1527 p = ip6_compressed_string(ip6_addr + off, addr);
1529 p = ip6_string(ip6_addr + off, addr, fmt6);
1531 if (have_p || have_s || have_f)
1536 p = number(p, pend, ntohs(sa->sin6_port), spec);
1540 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1541 IPV6_FLOWINFO_MASK), spec);
1545 p = number(p, pend, sa->sin6_scope_id, spec);
1549 return string_nocheck(buf, end, ip6_addr, spec);
1552 static noinline_for_stack
1553 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1554 struct printf_spec spec, const char *fmt)
1556 bool have_p = false;
1557 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1558 char *pend = ip4_addr + sizeof(ip4_addr);
1559 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1560 char fmt4[3] = { fmt[0], '4', 0 };
1563 while (isalpha(*++fmt)) {
1577 p = ip4_string(ip4_addr, addr, fmt4);
1580 p = number(p, pend, ntohs(sa->sin_port), spec);
1584 return string_nocheck(buf, end, ip4_addr, spec);
1587 static noinline_for_stack
1588 char *ip_addr_string(char *buf, char *end, const void *ptr,
1589 struct printf_spec spec, const char *fmt)
1593 if (check_pointer(&buf, end, ptr, spec))
1598 return ip6_addr_string(buf, end, ptr, spec, fmt);
1600 return ip4_addr_string(buf, end, ptr, spec, fmt);
1603 struct sockaddr raw;
1604 struct sockaddr_in v4;
1605 struct sockaddr_in6 v6;
1608 switch (sa->raw.sa_family) {
1610 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1612 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1614 return error_string(buf, end, "(einval)", spec);
1618 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
1619 return error_string(buf, end, err_fmt_msg, spec);
1622 static noinline_for_stack
1623 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1628 unsigned int flags = 0;
1631 if (spec.field_width == 0)
1632 return buf; /* nothing to print */
1634 if (check_pointer(&buf, end, addr, spec))
1638 switch (fmt[count++]) {
1640 flags |= ESCAPE_ANY;
1643 flags |= ESCAPE_SPECIAL;
1646 flags |= ESCAPE_HEX;
1649 flags |= ESCAPE_NULL;
1652 flags |= ESCAPE_OCTAL;
1658 flags |= ESCAPE_SPACE;
1667 flags = ESCAPE_ANY_NP;
1669 len = spec.field_width < 0 ? 1 : spec.field_width;
1672 * string_escape_mem() writes as many characters as it can to
1673 * the given buffer, and returns the total size of the output
1674 * had the buffer been big enough.
1676 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1681 static char *va_format(char *buf, char *end, struct va_format *va_fmt,
1682 struct printf_spec spec, const char *fmt)
1686 if (check_pointer(&buf, end, va_fmt, spec))
1689 va_copy(va, *va_fmt->va);
1690 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1696 static noinline_for_stack
1697 char *uuid_string(char *buf, char *end, const u8 *addr,
1698 struct printf_spec spec, const char *fmt)
1700 char uuid[UUID_STRING_LEN + 1];
1703 const u8 *index = uuid_index;
1706 if (check_pointer(&buf, end, addr, spec))
1721 for (i = 0; i < 16; i++) {
1723 p = hex_byte_pack_upper(p, addr[index[i]]);
1725 p = hex_byte_pack(p, addr[index[i]]);
1738 return string_nocheck(buf, end, uuid, spec);
1741 static noinline_for_stack
1742 char *netdev_bits(char *buf, char *end, const void *addr,
1743 struct printf_spec spec, const char *fmt)
1745 unsigned long long num;
1748 if (check_pointer(&buf, end, addr, spec))
1753 num = *(const netdev_features_t *)addr;
1754 size = sizeof(netdev_features_t);
1757 return error_string(buf, end, "(%pN?)", spec);
1760 return special_hex_number(buf, end, num, size);
1763 static noinline_for_stack
1764 char *fourcc_string(char *buf, char *end, const u32 *fourcc,
1765 struct printf_spec spec, const char *fmt)
1767 char output[sizeof("0123 little-endian (0x01234567)")];
1772 if (fmt[1] != 'c' || fmt[2] != 'c')
1773 return error_string(buf, end, "(%p4?)", spec);
1775 if (check_pointer(&buf, end, fourcc, spec))
1778 val = *fourcc & ~BIT(31);
1780 for (i = 0; i < sizeof(*fourcc); i++) {
1781 unsigned char c = val >> (i * 8);
1783 /* Print non-control ASCII characters as-is, dot otherwise */
1784 *p++ = isascii(c) && isprint(c) ? c : '.';
1787 strcpy(p, *fourcc & BIT(31) ? " big-endian" : " little-endian");
1792 p = special_hex_number(p, output + sizeof(output) - 2, *fourcc, sizeof(u32));
1796 return string(buf, end, output, spec);
1799 static noinline_for_stack
1800 char *address_val(char *buf, char *end, const void *addr,
1801 struct printf_spec spec, const char *fmt)
1803 unsigned long long num;
1806 if (check_pointer(&buf, end, addr, spec))
1811 num = *(const dma_addr_t *)addr;
1812 size = sizeof(dma_addr_t);
1816 num = *(const phys_addr_t *)addr;
1817 size = sizeof(phys_addr_t);
1821 return special_hex_number(buf, end, num, size);
1824 static noinline_for_stack
1825 char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1827 int year = tm->tm_year + (r ? 0 : 1900);
1828 int mon = tm->tm_mon + (r ? 0 : 1);
1830 buf = number(buf, end, year, default_dec04_spec);
1835 buf = number(buf, end, mon, default_dec02_spec);
1840 return number(buf, end, tm->tm_mday, default_dec02_spec);
1843 static noinline_for_stack
1844 char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1846 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1851 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1856 return number(buf, end, tm->tm_sec, default_dec02_spec);
1859 static noinline_for_stack
1860 char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
1861 struct printf_spec spec, const char *fmt)
1863 bool have_t = true, have_d = true;
1864 bool raw = false, iso8601_separator = true;
1868 if (check_pointer(&buf, end, tm, spec))
1871 switch (fmt[count]) {
1883 switch (fmt[count++]) {
1888 iso8601_separator = false;
1897 buf = date_str(buf, end, tm, raw);
1898 if (have_d && have_t) {
1900 *buf = iso8601_separator ? 'T' : ' ';
1904 buf = time_str(buf, end, tm, raw);
1909 static noinline_for_stack
1910 char *time64_str(char *buf, char *end, const time64_t time,
1911 struct printf_spec spec, const char *fmt)
1913 struct rtc_time rtc_time;
1916 time64_to_tm(time, 0, &tm);
1918 rtc_time.tm_sec = tm.tm_sec;
1919 rtc_time.tm_min = tm.tm_min;
1920 rtc_time.tm_hour = tm.tm_hour;
1921 rtc_time.tm_mday = tm.tm_mday;
1922 rtc_time.tm_mon = tm.tm_mon;
1923 rtc_time.tm_year = tm.tm_year;
1924 rtc_time.tm_wday = tm.tm_wday;
1925 rtc_time.tm_yday = tm.tm_yday;
1927 rtc_time.tm_isdst = 0;
1929 return rtc_str(buf, end, &rtc_time, spec, fmt);
1932 static noinline_for_stack
1933 char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1938 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
1940 return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);
1942 return error_string(buf, end, "(%pt?)", spec);
1946 static noinline_for_stack
1947 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1950 if (!IS_ENABLED(CONFIG_HAVE_CLK))
1951 return error_string(buf, end, "(%pC?)", spec);
1953 if (check_pointer(&buf, end, clk, spec))
1959 #ifdef CONFIG_COMMON_CLK
1960 return string(buf, end, __clk_get_name(clk), spec);
1962 return ptr_to_id(buf, end, clk, spec);
1968 char *format_flags(char *buf, char *end, unsigned long flags,
1969 const struct trace_print_flags *names)
1973 for ( ; flags && names->name; names++) {
1975 if ((flags & mask) != mask)
1978 buf = string(buf, end, names->name, default_str_spec);
1989 buf = number(buf, end, flags, default_flag_spec);
1994 struct page_flags_fields {
1998 const struct printf_spec *spec;
2002 static const struct page_flags_fields pff[] = {
2003 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
2004 &default_dec_spec, "section"},
2005 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
2006 &default_dec_spec, "node"},
2007 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
2008 &default_dec_spec, "zone"},
2009 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
2010 &default_flag_spec, "lastcpupid"},
2011 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
2012 &default_flag_spec, "kasantag"},
2016 char *format_page_flags(char *buf, char *end, unsigned long flags)
2018 unsigned long main_flags = flags & (BIT(NR_PAGEFLAGS) - 1);
2019 bool append = false;
2022 /* Page flags from the main area. */
2024 buf = format_flags(buf, end, main_flags, pageflag_names);
2028 /* Page flags from the fields area */
2029 for (i = 0; i < ARRAY_SIZE(pff); i++) {
2030 /* Skip undefined fields. */
2034 /* Format: Flag Name + '=' (equals sign) + Number + '|' (separator) */
2041 buf = string(buf, end, pff[i].name, default_str_spec);
2045 buf = number(buf, end, (flags >> pff[i].shift) & pff[i].mask,
2054 static noinline_for_stack
2055 char *flags_string(char *buf, char *end, void *flags_ptr,
2056 struct printf_spec spec, const char *fmt)
2058 unsigned long flags;
2059 const struct trace_print_flags *names;
2061 if (check_pointer(&buf, end, flags_ptr, spec))
2066 return format_page_flags(buf, end, *(unsigned long *)flags_ptr);
2068 flags = *(unsigned long *)flags_ptr;
2069 names = vmaflag_names;
2072 flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
2073 names = gfpflag_names;
2076 return error_string(buf, end, "(%pG?)", spec);
2079 return format_flags(buf, end, flags, names);
2082 static noinline_for_stack
2083 char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
2088 /* Loop starting from the root node to the current node. */
2089 for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
2090 struct fwnode_handle *__fwnode =
2091 fwnode_get_nth_parent(fwnode, depth);
2093 buf = string(buf, end, fwnode_get_name_prefix(__fwnode),
2095 buf = string(buf, end, fwnode_get_name(__fwnode),
2098 fwnode_handle_put(__fwnode);
2104 static noinline_for_stack
2105 char *device_node_string(char *buf, char *end, struct device_node *dn,
2106 struct printf_spec spec, const char *fmt)
2108 char tbuf[sizeof("xxxx") + 1];
2111 char *buf_start = buf;
2112 struct property *prop;
2113 bool has_mult, pass;
2115 struct printf_spec str_spec = spec;
2116 str_spec.field_width = -1;
2119 return error_string(buf, end, "(%pO?)", spec);
2121 if (!IS_ENABLED(CONFIG_OF))
2122 return error_string(buf, end, "(%pOF?)", spec);
2124 if (check_pointer(&buf, end, dn, spec))
2127 /* simple case without anything any more format specifiers */
2129 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
2132 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
2141 case 'f': /* full_name */
2142 buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
2145 case 'n': /* name */
2146 p = fwnode_get_name(of_fwnode_handle(dn));
2147 precision = str_spec.precision;
2148 str_spec.precision = strchrnul(p, '@') - p;
2149 buf = string(buf, end, p, str_spec);
2150 str_spec.precision = precision;
2152 case 'p': /* phandle */
2153 buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);
2155 case 'P': /* path-spec */
2156 p = fwnode_get_name(of_fwnode_handle(dn));
2159 buf = string(buf, end, p, str_spec);
2161 case 'F': /* flags */
2162 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
2163 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
2164 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
2165 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
2167 buf = string_nocheck(buf, end, tbuf, str_spec);
2169 case 'c': /* major compatible string */
2170 ret = of_property_read_string(dn, "compatible", &p);
2172 buf = string(buf, end, p, str_spec);
2174 case 'C': /* full compatible string */
2176 of_property_for_each_string(dn, "compatible", prop, p) {
2178 buf = string_nocheck(buf, end, ",", str_spec);
2179 buf = string_nocheck(buf, end, "\"", str_spec);
2180 buf = string(buf, end, p, str_spec);
2181 buf = string_nocheck(buf, end, "\"", str_spec);
2191 return widen_string(buf, buf - buf_start, end, spec);
2194 static noinline_for_stack
2195 char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
2196 struct printf_spec spec, const char *fmt)
2198 struct printf_spec str_spec = spec;
2199 char *buf_start = buf;
2201 str_spec.field_width = -1;
2204 return error_string(buf, end, "(%pf?)", spec);
2206 if (check_pointer(&buf, end, fwnode, spec))
2212 case 'P': /* name */
2213 buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
2215 case 'f': /* full_name */
2217 buf = fwnode_full_name_string(fwnode, buf, end);
2221 return widen_string(buf, buf - buf_start, end, spec);
2224 /* Disable pointer hashing if requested */
2225 bool no_hash_pointers __ro_after_init;
2226 EXPORT_SYMBOL_GPL(no_hash_pointers);
2228 int __init no_hash_pointers_enable(char *str)
2230 if (no_hash_pointers)
2233 no_hash_pointers = true;
2235 pr_warn("**********************************************************\n");
2236 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2238 pr_warn("** This system shows unhashed kernel memory addresses **\n");
2239 pr_warn("** via the console, logs, and other interfaces. This **\n");
2240 pr_warn("** might reduce the security of your system. **\n");
2242 pr_warn("** If you see this message and you are not debugging **\n");
2243 pr_warn("** the kernel, report this immediately to your system **\n");
2244 pr_warn("** administrator! **\n");
2246 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2247 pr_warn("**********************************************************\n");
2251 early_param("no_hash_pointers", no_hash_pointers_enable);
2254 * Show a '%p' thing. A kernel extension is that the '%p' is followed
2255 * by an extra set of alphanumeric characters that are extended format
2258 * Please update scripts/checkpatch.pl when adding/removing conversion
2259 * characters. (Search for "check for vsprintf extension").
2261 * Right now we handle:
2263 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2264 * - 's' For symbolic direct pointers (or function descriptors) without offset
2265 * - '[Ss]R' as above with __builtin_extract_return_addr() translation
2266 * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
2267 * %ps and %pS. Be careful when re-using these specifiers.
2268 * - 'B' For backtraced symbolic direct pointers with offset
2269 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2270 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
2271 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2272 * width which must be explicitly specified either as part of the
2273 * format string '%32b[l]' or through '%*b[l]', [l] selects
2274 * range-list format instead of hex format
2275 * - 'M' For a 6-byte MAC address, it prints the address in the
2276 * usual colon-separated hex notation
2277 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
2278 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
2279 * with a dash-separated hex notation
2280 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
2281 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2282 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2283 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
2285 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2286 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2287 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2288 * IPv6 omits the colons (01020304...0f)
2289 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
2291 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2292 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2293 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2294 * - 'I[6S]c' for IPv6 addresses printed as specified by
2295 * https://tools.ietf.org/html/rfc5952
2296 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2297 * of the following flags (see string_escape_mem() for the
2300 * c - ESCAPE_SPECIAL
2306 * By default ESCAPE_ANY_NP is used.
2307 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2308 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2309 * Options for %pU are:
2310 * b big endian lower case hex (default)
2311 * B big endian UPPER case hex
2312 * l little endian lower case hex
2313 * L little endian UPPER case hex
2314 * big endian output byte order is:
2315 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2316 * little endian output byte order is:
2317 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
2318 * - 'V' For a struct va_format which contains a format string * and va_list *,
2319 * call vsnprintf(->format, *->va_list).
2320 * Implements a "recursive vsnprintf".
2321 * Do not use this feature without some mechanism to verify the
2322 * correctness of the format string and va_list arguments.
2323 * - 'K' For a kernel pointer that should be hidden from unprivileged users.
2324 * Use only for procfs, sysfs and similar files, not printk(); please
2325 * read the documentation (path below) first.
2326 * - 'NF' For a netdev_features_t
2327 * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
2328 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2329 * a certain separator (' ' by default):
2333 * The maximum supported length is 64 bytes of the input. Consider
2334 * to use print_hex_dump() for the larger input.
2335 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2336 * (default assumed to be phys_addr_t, passed by reference)
2337 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2338 * - 'D[234]' Same as 'd' but for a struct file
2339 * - 'g' For block_device name (gendisk + partition number)
2340 * - 't[RT][dt][r][s]' For time and date as represented by:
2343 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2344 * (legacy clock framework) of the clock
2345 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2346 * (legacy clock framework) of the clock
2347 * - 'G' For flags to be printed as a collection of symbolic strings that would
2348 * construct the specific value. Supported flags given by option:
2349 * p page flags (see struct page) given as pointer to unsigned long
2350 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2351 * v vma flags (VM_*) given as pointer to unsigned long
2352 * - 'OF[fnpPcCF]' For a device tree object
2353 * Without any optional arguments prints the full_name
2354 * f device node full_name
2355 * n device node name
2356 * p device node phandle
2357 * P device node path spec (name + @unit)
2358 * F device node flags
2359 * c major compatible string
2360 * C full compatible string
2361 * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
2362 * Without an option prints the full name of the node
2364 * P node name, including a possible unit address
2365 * - 'x' For printing the address unmodified. Equivalent to "%lx".
2366 * Please read the documentation (path below) before using!
2367 * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of
2368 * bpf_trace_printk() where [ku] prefix specifies either kernel (k)
2369 * or user (u) memory to probe, and:
2370 * s a string, equivalent to "%s" on direct vsnprintf() use
2372 * ** When making changes please also update:
2373 * Documentation/core-api/printk-formats.rst
2375 * Note: The default behaviour (unadorned %p) is to hash the address,
2376 * rendering it useful as a unique identifier.
2378 static noinline_for_stack
2379 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2380 struct printf_spec spec)
2385 ptr = dereference_symbol_descriptor(ptr);
2388 return symbol_string(buf, end, ptr, spec, fmt);
2391 return resource_string(buf, end, ptr, spec, fmt);
2393 return hex_string(buf, end, ptr, spec, fmt);
2397 return bitmap_list_string(buf, end, ptr, spec, fmt);
2399 return bitmap_string(buf, end, ptr, spec, fmt);
2401 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2402 case 'm': /* Contiguous: 000102030405 */
2404 /* [mM]R (Reverse order; Bluetooth) */
2405 return mac_address_string(buf, end, ptr, spec, fmt);
2406 case 'I': /* Formatted IP supported
2408 * 6: 0001:0203:...:0708
2409 * 6c: 1::708 or 1::1.2.3.4
2411 case 'i': /* Contiguous:
2412 * 4: 001.002.003.004
2415 return ip_addr_string(buf, end, ptr, spec, fmt);
2417 return escaped_string(buf, end, ptr, spec, fmt);
2419 return uuid_string(buf, end, ptr, spec, fmt);
2421 return va_format(buf, end, ptr, spec, fmt);
2423 return restricted_pointer(buf, end, ptr, spec);
2425 return netdev_bits(buf, end, ptr, spec, fmt);
2427 return fourcc_string(buf, end, ptr, spec, fmt);
2429 return address_val(buf, end, ptr, spec, fmt);
2431 return dentry_name(buf, end, ptr, spec, fmt);
2433 return time_and_date(buf, end, ptr, spec, fmt);
2435 return clock(buf, end, ptr, spec, fmt);
2437 return file_dentry_name(buf, end, ptr, spec, fmt);
2440 return bdev_name(buf, end, ptr, spec, fmt);
2444 return flags_string(buf, end, ptr, spec, fmt);
2446 return device_node_string(buf, end, ptr, spec, fmt + 1);
2448 return fwnode_string(buf, end, ptr, spec, fmt + 1);
2450 return pointer_string(buf, end, ptr, spec);
2452 /* %pe with a non-ERR_PTR gets treated as plain %p */
2455 return err_ptr(buf, end, ptr, spec);
2460 return string(buf, end, ptr, spec);
2462 return error_string(buf, end, "(einval)", spec);
2467 * default is to _not_ leak addresses, so hash before printing,
2468 * unless no_hash_pointers is specified on the command line.
2470 if (unlikely(no_hash_pointers))
2471 return pointer_string(buf, end, ptr, spec);
2473 return ptr_to_id(buf, end, ptr, spec);
2477 * Helper function to decode printf style format.
2478 * Each call decode a token from the format and return the
2479 * number of characters read (or likely the delta where it wants
2480 * to go on the next call).
2481 * The decoded token is returned through the parameters
2483 * 'h', 'l', or 'L' for integer fields
2484 * 'z' support added 23/7/1999 S.H.
2485 * 'z' changed to 'Z' --davidm 1/25/99
2486 * 'Z' changed to 'z' --adobriyan 2017-01-25
2487 * 't' added for ptrdiff_t
2489 * @fmt: the format string
2490 * @type of the token returned
2491 * @flags: various flags such as +, -, # tokens..
2492 * @field_width: overwritten width
2493 * @base: base of the number (octal, hex, ...)
2494 * @precision: precision of a number
2495 * @qualifier: qualifier of a number (long, size_t, ...)
2497 static noinline_for_stack
2498 int format_decode(const char *fmt, struct printf_spec *spec)
2500 const char *start = fmt;
2503 /* we finished early by reading the field width */
2504 if (spec->type == FORMAT_TYPE_WIDTH) {
2505 if (spec->field_width < 0) {
2506 spec->field_width = -spec->field_width;
2507 spec->flags |= LEFT;
2509 spec->type = FORMAT_TYPE_NONE;
2513 /* we finished early by reading the precision */
2514 if (spec->type == FORMAT_TYPE_PRECISION) {
2515 if (spec->precision < 0)
2516 spec->precision = 0;
2518 spec->type = FORMAT_TYPE_NONE;
2523 spec->type = FORMAT_TYPE_NONE;
2525 for (; *fmt ; ++fmt) {
2530 /* Return the current non-format string */
2531 if (fmt != start || !*fmt)
2537 while (1) { /* this also skips first '%' */
2543 case '-': spec->flags |= LEFT; break;
2544 case '+': spec->flags |= PLUS; break;
2545 case ' ': spec->flags |= SPACE; break;
2546 case '#': spec->flags |= SPECIAL; break;
2547 case '0': spec->flags |= ZEROPAD; break;
2548 default: found = false;
2555 /* get field width */
2556 spec->field_width = -1;
2559 spec->field_width = skip_atoi(&fmt);
2560 else if (*fmt == '*') {
2561 /* it's the next argument */
2562 spec->type = FORMAT_TYPE_WIDTH;
2563 return ++fmt - start;
2567 /* get the precision */
2568 spec->precision = -1;
2571 if (isdigit(*fmt)) {
2572 spec->precision = skip_atoi(&fmt);
2573 if (spec->precision < 0)
2574 spec->precision = 0;
2575 } else if (*fmt == '*') {
2576 /* it's the next argument */
2577 spec->type = FORMAT_TYPE_PRECISION;
2578 return ++fmt - start;
2583 /* get the conversion qualifier */
2585 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2586 *fmt == 'z' || *fmt == 't') {
2588 if (unlikely(qualifier == *fmt)) {
2589 if (qualifier == 'l') {
2592 } else if (qualifier == 'h') {
2603 spec->type = FORMAT_TYPE_CHAR;
2604 return ++fmt - start;
2607 spec->type = FORMAT_TYPE_STR;
2608 return ++fmt - start;
2611 spec->type = FORMAT_TYPE_PTR;
2612 return ++fmt - start;
2615 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2616 return ++fmt - start;
2618 /* integer number formats - set up the flags and "break" */
2624 spec->flags |= SMALL;
2633 spec->flags |= SIGN;
2640 * Since %n poses a greater security risk than
2641 * utility, treat it as any other invalid or
2642 * unsupported format specifier.
2647 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
2648 spec->type = FORMAT_TYPE_INVALID;
2652 if (qualifier == 'L')
2653 spec->type = FORMAT_TYPE_LONG_LONG;
2654 else if (qualifier == 'l') {
2655 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2656 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
2657 } else if (qualifier == 'z') {
2658 spec->type = FORMAT_TYPE_SIZE_T;
2659 } else if (qualifier == 't') {
2660 spec->type = FORMAT_TYPE_PTRDIFF;
2661 } else if (qualifier == 'H') {
2662 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2663 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
2664 } else if (qualifier == 'h') {
2665 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2666 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
2668 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2669 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
2672 return ++fmt - start;
2676 set_field_width(struct printf_spec *spec, int width)
2678 spec->field_width = width;
2679 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2680 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2685 set_precision(struct printf_spec *spec, int prec)
2687 spec->precision = prec;
2688 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2689 spec->precision = clamp(prec, 0, PRECISION_MAX);
2694 * vsnprintf - Format a string and place it in a buffer
2695 * @buf: The buffer to place the result into
2696 * @size: The size of the buffer, including the trailing null space
2697 * @fmt: The format string to use
2698 * @args: Arguments for the format string
2700 * This function generally follows C99 vsnprintf, but has some
2701 * extensions and a few limitations:
2703 * - ``%n`` is unsupported
2704 * - ``%p*`` is handled by pointer()
2706 * See pointer() or Documentation/core-api/printk-formats.rst for more
2707 * extensive description.
2709 * **Please update the documentation in both places when making changes**
2711 * The return value is the number of characters which would
2712 * be generated for the given input, excluding the trailing
2713 * '\0', as per ISO C99. If you want to have the exact
2714 * number of characters written into @buf as return value
2715 * (not including the trailing '\0'), use vscnprintf(). If the
2716 * return is greater than or equal to @size, the resulting
2717 * string is truncated.
2719 * If you're not already dealing with a va_list consider using snprintf().
2721 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2723 unsigned long long num;
2725 struct printf_spec spec = {0};
2727 /* Reject out-of-range values early. Large positive sizes are
2728 used for unknown buffer sizes. */
2729 if (WARN_ON_ONCE(size > INT_MAX))
2735 /* Make sure end is always >= buf */
2742 const char *old_fmt = fmt;
2743 int read = format_decode(fmt, &spec);
2747 switch (spec.type) {
2748 case FORMAT_TYPE_NONE: {
2751 if (copy > end - str)
2753 memcpy(str, old_fmt, copy);
2759 case FORMAT_TYPE_WIDTH:
2760 set_field_width(&spec, va_arg(args, int));
2763 case FORMAT_TYPE_PRECISION:
2764 set_precision(&spec, va_arg(args, int));
2767 case FORMAT_TYPE_CHAR: {
2770 if (!(spec.flags & LEFT)) {
2771 while (--spec.field_width > 0) {
2778 c = (unsigned char) va_arg(args, int);
2782 while (--spec.field_width > 0) {
2790 case FORMAT_TYPE_STR:
2791 str = string(str, end, va_arg(args, char *), spec);
2794 case FORMAT_TYPE_PTR:
2795 str = pointer(fmt, str, end, va_arg(args, void *),
2797 while (isalnum(*fmt))
2801 case FORMAT_TYPE_PERCENT_CHAR:
2807 case FORMAT_TYPE_INVALID:
2809 * Presumably the arguments passed gcc's type
2810 * checking, but there is no safe or sane way
2811 * for us to continue parsing the format and
2812 * fetching from the va_list; the remaining
2813 * specifiers and arguments would be out of
2819 switch (spec.type) {
2820 case FORMAT_TYPE_LONG_LONG:
2821 num = va_arg(args, long long);
2823 case FORMAT_TYPE_ULONG:
2824 num = va_arg(args, unsigned long);
2826 case FORMAT_TYPE_LONG:
2827 num = va_arg(args, long);
2829 case FORMAT_TYPE_SIZE_T:
2830 if (spec.flags & SIGN)
2831 num = va_arg(args, ssize_t);
2833 num = va_arg(args, size_t);
2835 case FORMAT_TYPE_PTRDIFF:
2836 num = va_arg(args, ptrdiff_t);
2838 case FORMAT_TYPE_UBYTE:
2839 num = (unsigned char) va_arg(args, int);
2841 case FORMAT_TYPE_BYTE:
2842 num = (signed char) va_arg(args, int);
2844 case FORMAT_TYPE_USHORT:
2845 num = (unsigned short) va_arg(args, int);
2847 case FORMAT_TYPE_SHORT:
2848 num = (short) va_arg(args, int);
2850 case FORMAT_TYPE_INT:
2851 num = (int) va_arg(args, int);
2854 num = va_arg(args, unsigned int);
2857 str = number(str, end, num, spec);
2869 /* the trailing null byte doesn't count towards the total */
2873 EXPORT_SYMBOL(vsnprintf);
2876 * vscnprintf - Format a string and place it in a buffer
2877 * @buf: The buffer to place the result into
2878 * @size: The size of the buffer, including the trailing null space
2879 * @fmt: The format string to use
2880 * @args: Arguments for the format string
2882 * The return value is the number of characters which have been written into
2883 * the @buf not including the trailing '\0'. If @size is == 0 the function
2886 * If you're not already dealing with a va_list consider using scnprintf().
2888 * See the vsnprintf() documentation for format string extensions over C99.
2890 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2894 i = vsnprintf(buf, size, fmt, args);
2896 if (likely(i < size))
2902 EXPORT_SYMBOL(vscnprintf);
2905 * snprintf - Format a string and place it in a buffer
2906 * @buf: The buffer to place the result into
2907 * @size: The size of the buffer, including the trailing null space
2908 * @fmt: The format string to use
2909 * @...: Arguments for the format string
2911 * The return value is the number of characters which would be
2912 * generated for the given input, excluding the trailing null,
2913 * as per ISO C99. If the return is greater than or equal to
2914 * @size, the resulting string is truncated.
2916 * See the vsnprintf() documentation for format string extensions over C99.
2918 int snprintf(char *buf, size_t size, const char *fmt, ...)
2923 va_start(args, fmt);
2924 i = vsnprintf(buf, size, fmt, args);
2929 EXPORT_SYMBOL(snprintf);
2932 * scnprintf - Format a string and place it in a buffer
2933 * @buf: The buffer to place the result into
2934 * @size: The size of the buffer, including the trailing null space
2935 * @fmt: The format string to use
2936 * @...: Arguments for the format string
2938 * The return value is the number of characters written into @buf not including
2939 * the trailing '\0'. If @size is == 0 the function returns 0.
2942 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2947 va_start(args, fmt);
2948 i = vscnprintf(buf, size, fmt, args);
2953 EXPORT_SYMBOL(scnprintf);
2956 * vsprintf - Format a string and place it in a buffer
2957 * @buf: The buffer to place the result into
2958 * @fmt: The format string to use
2959 * @args: Arguments for the format string
2961 * The function returns the number of characters written
2962 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2965 * If you're not already dealing with a va_list consider using sprintf().
2967 * See the vsnprintf() documentation for format string extensions over C99.
2969 int vsprintf(char *buf, const char *fmt, va_list args)
2971 return vsnprintf(buf, INT_MAX, fmt, args);
2973 EXPORT_SYMBOL(vsprintf);
2976 * sprintf - Format a string and place it in a buffer
2977 * @buf: The buffer to place the result into
2978 * @fmt: The format string to use
2979 * @...: Arguments for the format string
2981 * The function returns the number of characters written
2982 * into @buf. Use snprintf() or scnprintf() in order to avoid
2985 * See the vsnprintf() documentation for format string extensions over C99.
2987 int sprintf(char *buf, const char *fmt, ...)
2992 va_start(args, fmt);
2993 i = vsnprintf(buf, INT_MAX, fmt, args);
2998 EXPORT_SYMBOL(sprintf);
3000 #ifdef CONFIG_BINARY_PRINTF
3003 * vbin_printf() - VA arguments to binary data
3004 * bstr_printf() - Binary data to text string
3008 * vbin_printf - Parse a format string and place args' binary value in a buffer
3009 * @bin_buf: The buffer to place args' binary value
3010 * @size: The size of the buffer(by words(32bits), not characters)
3011 * @fmt: The format string to use
3012 * @args: Arguments for the format string
3014 * The format follows C99 vsnprintf, except %n is ignored, and its argument
3017 * The return value is the number of words(32bits) which would be generated for
3021 * If the return value is greater than @size, the resulting bin_buf is NOT
3022 * valid for bstr_printf().
3024 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
3026 struct printf_spec spec = {0};
3030 str = (char *)bin_buf;
3031 end = (char *)(bin_buf + size);
3033 #define save_arg(type) \
3035 unsigned long long value; \
3036 if (sizeof(type) == 8) { \
3037 unsigned long long val8; \
3038 str = PTR_ALIGN(str, sizeof(u32)); \
3039 val8 = va_arg(args, unsigned long long); \
3040 if (str + sizeof(type) <= end) { \
3041 *(u32 *)str = *(u32 *)&val8; \
3042 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
3046 unsigned int val4; \
3047 str = PTR_ALIGN(str, sizeof(type)); \
3048 val4 = va_arg(args, int); \
3049 if (str + sizeof(type) <= end) \
3050 *(typeof(type) *)str = (type)(long)val4; \
3051 value = (unsigned long long)val4; \
3053 str += sizeof(type); \
3058 int read = format_decode(fmt, &spec);
3062 switch (spec.type) {
3063 case FORMAT_TYPE_NONE:
3064 case FORMAT_TYPE_PERCENT_CHAR:
3066 case FORMAT_TYPE_INVALID:
3069 case FORMAT_TYPE_WIDTH:
3070 case FORMAT_TYPE_PRECISION:
3071 width = (int)save_arg(int);
3072 /* Pointers may require the width */
3074 set_field_width(&spec, width);
3077 case FORMAT_TYPE_CHAR:
3081 case FORMAT_TYPE_STR: {
3082 const char *save_str = va_arg(args, char *);
3083 const char *err_msg;
3086 err_msg = check_pointer_msg(save_str);
3090 len = strlen(save_str) + 1;
3091 if (str + len < end)
3092 memcpy(str, save_str, len);
3097 case FORMAT_TYPE_PTR:
3098 /* Dereferenced pointers must be done now */
3100 /* Dereference of functions is still OK */
3109 if (!isalnum(*fmt)) {
3113 str = pointer(fmt, str, end, va_arg(args, void *),
3118 end[-1] = '\0'; /* Must be nul terminated */
3120 /* skip all alphanumeric pointer suffixes */
3121 while (isalnum(*fmt))
3126 switch (spec.type) {
3128 case FORMAT_TYPE_LONG_LONG:
3129 save_arg(long long);
3131 case FORMAT_TYPE_ULONG:
3132 case FORMAT_TYPE_LONG:
3133 save_arg(unsigned long);
3135 case FORMAT_TYPE_SIZE_T:
3138 case FORMAT_TYPE_PTRDIFF:
3139 save_arg(ptrdiff_t);
3141 case FORMAT_TYPE_UBYTE:
3142 case FORMAT_TYPE_BYTE:
3145 case FORMAT_TYPE_USHORT:
3146 case FORMAT_TYPE_SHORT:
3156 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
3159 EXPORT_SYMBOL_GPL(vbin_printf);
3162 * bstr_printf - Format a string from binary arguments and place it in a buffer
3163 * @buf: The buffer to place the result into
3164 * @size: The size of the buffer, including the trailing null space
3165 * @fmt: The format string to use
3166 * @bin_buf: Binary arguments for the format string
3168 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
3169 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
3170 * a binary buffer that generated by vbin_printf.
3172 * The format follows C99 vsnprintf, but has some extensions:
3173 * see vsnprintf comment for details.
3175 * The return value is the number of characters which would
3176 * be generated for the given input, excluding the trailing
3177 * '\0', as per ISO C99. If you want to have the exact
3178 * number of characters written into @buf as return value
3179 * (not including the trailing '\0'), use vscnprintf(). If the
3180 * return is greater than or equal to @size, the resulting
3181 * string is truncated.
3183 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
3185 struct printf_spec spec = {0};
3187 const char *args = (const char *)bin_buf;
3189 if (WARN_ON_ONCE(size > INT_MAX))
3195 #define get_arg(type) \
3197 typeof(type) value; \
3198 if (sizeof(type) == 8) { \
3199 args = PTR_ALIGN(args, sizeof(u32)); \
3200 *(u32 *)&value = *(u32 *)args; \
3201 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
3203 args = PTR_ALIGN(args, sizeof(type)); \
3204 value = *(typeof(type) *)args; \
3206 args += sizeof(type); \
3210 /* Make sure end is always >= buf */
3217 const char *old_fmt = fmt;
3218 int read = format_decode(fmt, &spec);
3222 switch (spec.type) {
3223 case FORMAT_TYPE_NONE: {
3226 if (copy > end - str)
3228 memcpy(str, old_fmt, copy);
3234 case FORMAT_TYPE_WIDTH:
3235 set_field_width(&spec, get_arg(int));
3238 case FORMAT_TYPE_PRECISION:
3239 set_precision(&spec, get_arg(int));
3242 case FORMAT_TYPE_CHAR: {
3245 if (!(spec.flags & LEFT)) {
3246 while (--spec.field_width > 0) {
3252 c = (unsigned char) get_arg(char);
3256 while (--spec.field_width > 0) {
3264 case FORMAT_TYPE_STR: {
3265 const char *str_arg = args;
3266 args += strlen(str_arg) + 1;
3267 str = string(str, end, (char *)str_arg, spec);
3271 case FORMAT_TYPE_PTR: {
3272 bool process = false;
3274 /* Non function dereferences were already done */
3284 if (!isalnum(*fmt)) {
3288 /* Pointer dereference was already processed */
3290 len = copy = strlen(args);
3291 if (copy > end - str)
3293 memcpy(str, args, copy);
3299 str = pointer(fmt, str, end, get_arg(void *), spec);
3301 while (isalnum(*fmt))
3306 case FORMAT_TYPE_PERCENT_CHAR:
3312 case FORMAT_TYPE_INVALID:
3316 unsigned long long num;
3318 switch (spec.type) {
3320 case FORMAT_TYPE_LONG_LONG:
3321 num = get_arg(long long);
3323 case FORMAT_TYPE_ULONG:
3324 case FORMAT_TYPE_LONG:
3325 num = get_arg(unsigned long);
3327 case FORMAT_TYPE_SIZE_T:
3328 num = get_arg(size_t);
3330 case FORMAT_TYPE_PTRDIFF:
3331 num = get_arg(ptrdiff_t);
3333 case FORMAT_TYPE_UBYTE:
3334 num = get_arg(unsigned char);
3336 case FORMAT_TYPE_BYTE:
3337 num = get_arg(signed char);
3339 case FORMAT_TYPE_USHORT:
3340 num = get_arg(unsigned short);
3342 case FORMAT_TYPE_SHORT:
3343 num = get_arg(short);
3345 case FORMAT_TYPE_UINT:
3346 num = get_arg(unsigned int);
3352 str = number(str, end, num, spec);
3354 } /* switch(spec.type) */
3367 /* the trailing null byte doesn't count towards the total */
3370 EXPORT_SYMBOL_GPL(bstr_printf);
3373 * bprintf - Parse a format string and place args' binary value in a buffer
3374 * @bin_buf: The buffer to place args' binary value
3375 * @size: The size of the buffer(by words(32bits), not characters)
3376 * @fmt: The format string to use
3377 * @...: Arguments for the format string
3379 * The function returns the number of words(u32) written
3382 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3387 va_start(args, fmt);
3388 ret = vbin_printf(bin_buf, size, fmt, args);
3393 EXPORT_SYMBOL_GPL(bprintf);
3395 #endif /* CONFIG_BINARY_PRINTF */
3398 * vsscanf - Unformat a buffer into a list of arguments
3399 * @buf: input buffer
3400 * @fmt: format of buffer
3403 int vsscanf(const char *buf, const char *fmt, va_list args)
3405 const char *str = buf;
3413 unsigned long long u;
3419 /* skip any white space in format */
3420 /* white space in format matches any amount of
3421 * white space, including none, in the input.
3423 if (isspace(*fmt)) {
3424 fmt = skip_spaces(++fmt);
3425 str = skip_spaces(str);
3428 /* anything that is not a conversion must match exactly */
3429 if (*fmt != '%' && *fmt) {
3430 if (*fmt++ != *str++)
3439 /* skip this conversion.
3440 * advance both strings to next white space
3445 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3446 /* '%*[' not yet supported, invalid format */
3451 while (!isspace(*str) && *str)
3456 /* get field width */
3458 if (isdigit(*fmt)) {
3459 field_width = skip_atoi(&fmt);
3460 if (field_width <= 0)
3464 /* get conversion qualifier */
3466 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
3469 if (unlikely(qualifier == *fmt)) {
3470 if (qualifier == 'h') {
3473 } else if (qualifier == 'l') {
3484 /* return number of characters read so far */
3485 *va_arg(args, int *) = str - buf;
3499 char *s = (char *)va_arg(args, char*);
3500 if (field_width == -1)
3504 } while (--field_width > 0 && *str);
3510 char *s = (char *)va_arg(args, char *);
3511 if (field_width == -1)
3512 field_width = SHRT_MAX;
3513 /* first, skip leading white space in buffer */
3514 str = skip_spaces(str);
3516 /* now copy until next white space */
3517 while (*str && !isspace(*str) && field_width--)
3524 * Warning: This implementation of the '[' conversion specifier
3525 * deviates from its glibc counterpart in the following ways:
3526 * (1) It does NOT support ranges i.e. '-' is NOT a special
3528 * (2) It cannot match the closing bracket ']' itself
3529 * (3) A field width is required
3530 * (4) '%*[' (discard matching input) is currently not supported
3533 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3534 * buf1, buf2, buf3);
3540 char *s = (char *)va_arg(args, char *);
3541 DECLARE_BITMAP(set, 256) = {0};
3542 unsigned int len = 0;
3543 bool negate = (*fmt == '^');
3545 /* field width is required */
3546 if (field_width == -1)
3552 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3553 set_bit((u8)*fmt, set);
3555 /* no ']' or no character set found */
3561 bitmap_complement(set, set, 256);
3562 /* exclude null '\0' byte */
3566 /* match must be non-empty */
3567 if (!test_bit((u8)*str, set))
3570 while (test_bit((u8)*str, set) && field_width--)
3592 /* looking for '%' in str */
3597 /* invalid format; stop here */
3601 /* have some sort of integer conversion.
3602 * first, skip white space in buffer.
3604 str = skip_spaces(str);
3607 if (is_sign && digit == '-') {
3608 if (field_width == 1)
3615 || (base == 16 && !isxdigit(digit))
3616 || (base == 10 && !isdigit(digit))
3617 || (base == 8 && (!isdigit(digit) || digit > '7'))
3618 || (base == 0 && !isdigit(digit)))
3622 val.s = simple_strntoll(str,
3623 field_width >= 0 ? field_width : INT_MAX,
3626 val.u = simple_strntoull(str,
3627 field_width >= 0 ? field_width : INT_MAX,
3630 switch (qualifier) {
3631 case 'H': /* that's 'hh' in format */
3633 *va_arg(args, signed char *) = val.s;
3635 *va_arg(args, unsigned char *) = val.u;
3639 *va_arg(args, short *) = val.s;
3641 *va_arg(args, unsigned short *) = val.u;
3645 *va_arg(args, long *) = val.s;
3647 *va_arg(args, unsigned long *) = val.u;
3651 *va_arg(args, long long *) = val.s;
3653 *va_arg(args, unsigned long long *) = val.u;
3656 *va_arg(args, size_t *) = val.u;
3660 *va_arg(args, int *) = val.s;
3662 *va_arg(args, unsigned int *) = val.u;
3674 EXPORT_SYMBOL(vsscanf);
3677 * sscanf - Unformat a buffer into a list of arguments
3678 * @buf: input buffer
3679 * @fmt: formatting of buffer
3680 * @...: resulting arguments
3682 int sscanf(const char *buf, const char *fmt, ...)
3687 va_start(args, fmt);
3688 i = vsscanf(buf, fmt, args);
3693 EXPORT_SYMBOL(sscanf);