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
20 #include <linux/stdarg.h>
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 */
52 #include <asm/unaligned.h>
54 #include <linux/string_helpers.h>
57 /* Disable pointer hashing if requested */
58 bool no_hash_pointers __ro_after_init;
59 EXPORT_SYMBOL_GPL(no_hash_pointers);
61 static noinline unsigned long long simple_strntoull(const char *startp, size_t max_chars, char **endp, unsigned int base)
64 unsigned long long result = 0ULL;
68 cp = _parse_integer_fixup_radix(startp, &base);
69 prefix_chars = cp - startp;
70 if (prefix_chars < max_chars) {
71 rv = _parse_integer_limit(cp, base, &result, max_chars - prefix_chars);
73 cp += (rv & ~KSTRTOX_OVERFLOW);
75 /* Field too short for prefix + digit, skip over without converting */
76 cp = startp + max_chars;
86 * simple_strtoull - convert a string to an unsigned long long
87 * @cp: The start of the string
88 * @endp: A pointer to the end of the parsed string will be placed here
89 * @base: The number base to use
91 * This function has caveats. Please use kstrtoull instead.
94 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
96 return simple_strntoull(cp, INT_MAX, endp, base);
98 EXPORT_SYMBOL(simple_strtoull);
101 * simple_strtoul - convert a string to an unsigned long
102 * @cp: The start of the string
103 * @endp: A pointer to the end of the parsed string will be placed here
104 * @base: The number base to use
106 * This function has caveats. Please use kstrtoul instead.
108 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
110 return simple_strtoull(cp, endp, base);
112 EXPORT_SYMBOL(simple_strtoul);
115 * simple_strtol - convert a string to a signed long
116 * @cp: The start of the string
117 * @endp: A pointer to the end of the parsed string will be placed here
118 * @base: The number base to use
120 * This function has caveats. Please use kstrtol instead.
122 long simple_strtol(const char *cp, char **endp, unsigned int base)
125 return -simple_strtoul(cp + 1, endp, base);
127 return simple_strtoul(cp, endp, base);
129 EXPORT_SYMBOL(simple_strtol);
131 static long long simple_strntoll(const char *cp, size_t max_chars, char **endp,
135 * simple_strntoull() safely handles receiving max_chars==0 in the
136 * case cp[0] == '-' && max_chars == 1.
137 * If max_chars == 0 we can drop through and pass it to simple_strntoull()
138 * and the content of *cp is irrelevant.
140 if (*cp == '-' && max_chars > 0)
141 return -simple_strntoull(cp + 1, max_chars - 1, endp, base);
143 return simple_strntoull(cp, max_chars, endp, base);
147 * simple_strtoll - convert a string to a signed long long
148 * @cp: The start of the string
149 * @endp: A pointer to the end of the parsed string will be placed here
150 * @base: The number base to use
152 * This function has caveats. Please use kstrtoll instead.
154 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
156 return simple_strntoll(cp, INT_MAX, endp, base);
158 EXPORT_SYMBOL(simple_strtoll);
160 static noinline_for_stack
161 int skip_atoi(const char **s)
166 i = i*10 + *((*s)++) - '0';
167 } while (isdigit(**s));
173 * Decimal conversion is by far the most typical, and is used for
174 * /proc and /sys data. This directly impacts e.g. top performance
175 * with many processes running. We optimize it for speed by emitting
176 * two characters at a time, using a 200 byte lookup table. This
177 * roughly halves the number of multiplications compared to computing
178 * the digits one at a time. Implementation strongly inspired by the
179 * previous version, which in turn used ideas described at
180 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
181 * from the author, Douglas W. Jones).
183 * It turns out there is precisely one 26 bit fixed-point
184 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
185 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
186 * range happens to be somewhat larger (x <= 1073741898), but that's
187 * irrelevant for our purpose.
189 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
190 * need a 32x32->64 bit multiply, so we simply use the same constant.
192 * For dividing a number in the range [100, 10^4-1] by 100, there are
193 * several options. The simplest is (x * 0x147b) >> 19, which is valid
194 * for all x <= 43698.
197 static const u16 decpair[100] = {
198 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
199 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
200 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
201 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
202 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
203 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
204 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
205 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
206 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
207 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
208 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
213 * This will print a single '0' even if r == 0, since we would
214 * immediately jump to out_r where two 0s would be written but only
215 * one of them accounted for in buf. This is needed by ip4_string
216 * below. All other callers pass a non-zero value of r.
218 static noinline_for_stack
219 char *put_dec_trunc8(char *buf, unsigned r)
227 /* 100 <= r < 10^8 */
228 q = (r * (u64)0x28f5c29) >> 32;
229 *((u16 *)buf) = decpair[r - 100*q];
236 /* 100 <= q < 10^6 */
237 r = (q * (u64)0x28f5c29) >> 32;
238 *((u16 *)buf) = decpair[q - 100*r];
245 /* 100 <= r < 10^4 */
246 q = (r * 0x147b) >> 19;
247 *((u16 *)buf) = decpair[r - 100*q];
254 *((u16 *)buf) = decpair[r];
255 buf += r < 10 ? 1 : 2;
259 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
260 static noinline_for_stack
261 char *put_dec_full8(char *buf, unsigned r)
266 q = (r * (u64)0x28f5c29) >> 32;
267 *((u16 *)buf) = decpair[r - 100*q];
271 r = (q * (u64)0x28f5c29) >> 32;
272 *((u16 *)buf) = decpair[q - 100*r];
276 q = (r * 0x147b) >> 19;
277 *((u16 *)buf) = decpair[r - 100*q];
281 *((u16 *)buf) = decpair[q];
286 static noinline_for_stack
287 char *put_dec(char *buf, unsigned long long n)
289 if (n >= 100*1000*1000)
290 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
291 /* 1 <= n <= 1.6e11 */
292 if (n >= 100*1000*1000)
293 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
295 return put_dec_trunc8(buf, n);
298 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
301 put_dec_full4(char *buf, unsigned r)
306 q = (r * 0x147b) >> 19;
307 *((u16 *)buf) = decpair[r - 100*q];
310 *((u16 *)buf) = decpair[q];
314 * Call put_dec_full4 on x % 10000, return x / 10000.
315 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
316 * holds for all x < 1,128,869,999. The largest value this
317 * helper will ever be asked to convert is 1,125,520,955.
318 * (second call in the put_dec code, assuming n is all-ones).
320 static noinline_for_stack
321 unsigned put_dec_helper4(char *buf, unsigned x)
323 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
325 put_dec_full4(buf, x - q * 10000);
329 /* Based on code by Douglas W. Jones found at
330 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
331 * (with permission from the author).
332 * Performs no 64-bit division and hence should be fast on 32-bit machines.
335 char *put_dec(char *buf, unsigned long long n)
337 uint32_t d3, d2, d1, q, h;
339 if (n < 100*1000*1000)
340 return put_dec_trunc8(buf, n);
342 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
345 d3 = (h >> 16); /* implicit "& 0xffff" */
347 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
348 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
349 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
350 q = put_dec_helper4(buf, q);
352 q += 7671 * d3 + 9496 * d2 + 6 * d1;
353 q = put_dec_helper4(buf+4, q);
355 q += 4749 * d3 + 42 * d2;
356 q = put_dec_helper4(buf+8, q);
361 buf = put_dec_trunc8(buf, q);
362 else while (buf[-1] == '0')
371 * Convert passed number to decimal string.
372 * Returns the length of string. On buffer overflow, returns 0.
374 * If speed is not important, use snprintf(). It's easy to read the code.
376 int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
378 /* put_dec requires 2-byte alignment of the buffer. */
379 char tmp[sizeof(num) * 3] __aligned(2);
382 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
387 len = put_dec(tmp, num) - tmp;
390 if (len > size || width > size)
395 for (idx = 0; idx < width; idx++)
401 for (idx = 0; idx < len; ++idx)
402 buf[idx + width] = tmp[len - idx - 1];
407 #define SIGN 1 /* unsigned/signed, must be 1 */
408 #define LEFT 2 /* left justified */
409 #define PLUS 4 /* show plus */
410 #define SPACE 8 /* space if plus */
411 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
412 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
413 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
415 static_assert(SIGN == 1);
416 static_assert(ZEROPAD == ('0' - ' '));
417 static_assert(SMALL == ('a' ^ 'A'));
420 FORMAT_TYPE_NONE, /* Just a string part */
422 FORMAT_TYPE_PRECISION,
426 FORMAT_TYPE_PERCENT_CHAR,
428 FORMAT_TYPE_LONG_LONG,
442 unsigned int type:8; /* format_type enum */
443 signed int field_width:24; /* width of output field */
444 unsigned int flags:8; /* flags to number() */
445 unsigned int base:8; /* number base, 8, 10 or 16 only */
446 signed int precision:16; /* # of digits/chars */
448 static_assert(sizeof(struct printf_spec) == 8);
450 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
451 #define PRECISION_MAX ((1 << 15) - 1)
453 static noinline_for_stack
454 char *number(char *buf, char *end, unsigned long long num,
455 struct printf_spec spec)
457 /* put_dec requires 2-byte alignment of the buffer. */
458 char tmp[3 * sizeof(num)] __aligned(2);
461 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
463 bool is_zero = num == 0LL;
464 int field_width = spec.field_width;
465 int precision = spec.precision;
467 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
468 * produces same digits or (maybe lowercased) letters */
469 locase = (spec.flags & SMALL);
470 if (spec.flags & LEFT)
471 spec.flags &= ~ZEROPAD;
473 if (spec.flags & SIGN) {
474 if ((signed long long)num < 0) {
476 num = -(signed long long)num;
478 } else if (spec.flags & PLUS) {
481 } else if (spec.flags & SPACE) {
493 /* generate full string in tmp[], in reverse order */
496 tmp[i++] = hex_asc_upper[num] | locase;
497 else if (spec.base != 10) { /* 8 or 16 */
498 int mask = spec.base - 1;
504 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
507 } else { /* base 10 */
508 i = put_dec(tmp, num) - tmp;
511 /* printing 100 using %2d gives "100", not "00" */
514 /* leading space padding */
515 field_width -= precision;
516 if (!(spec.flags & (ZEROPAD | LEFT))) {
517 while (--field_width >= 0) {
529 /* "0x" / "0" prefix */
531 if (spec.base == 16 || !is_zero) {
536 if (spec.base == 16) {
538 *buf = ('X' | locase);
542 /* zero or space padding */
543 if (!(spec.flags & LEFT)) {
544 char c = ' ' + (spec.flags & ZEROPAD);
546 while (--field_width >= 0) {
552 /* hmm even more zero padding? */
553 while (i <= --precision) {
558 /* actual digits of result */
564 /* trailing space padding */
565 while (--field_width >= 0) {
574 static noinline_for_stack
575 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
577 struct printf_spec spec;
579 spec.type = FORMAT_TYPE_PTR;
580 spec.field_width = 2 + 2 * size; /* 0x + hex */
581 spec.flags = SPECIAL | SMALL | ZEROPAD;
585 return number(buf, end, num, spec);
588 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
591 if (buf >= end) /* nowhere to put anything */
594 if (size <= spaces) {
595 memset(buf, ' ', size);
599 if (len > size - spaces)
601 memmove(buf + spaces, buf, len);
603 memset(buf, ' ', spaces);
607 * Handle field width padding for a string.
608 * @buf: current buffer position
609 * @n: length of string
610 * @end: end of output buffer
611 * @spec: for field width and flags
612 * Returns: new buffer position after padding.
614 static noinline_for_stack
615 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
619 if (likely(n >= spec.field_width))
621 /* we want to pad the sucker */
622 spaces = spec.field_width - n;
623 if (!(spec.flags & LEFT)) {
624 move_right(buf - n, end, n, spaces);
635 /* Handle string from a well known address. */
636 static char *string_nocheck(char *buf, char *end, const char *s,
637 struct printf_spec spec)
640 int lim = spec.precision;
651 return widen_string(buf, len, end, spec);
654 static char *err_ptr(char *buf, char *end, void *ptr,
655 struct printf_spec spec)
657 int err = PTR_ERR(ptr);
658 const char *sym = errname(err);
661 return string_nocheck(buf, end, sym, spec);
664 * Somebody passed ERR_PTR(-1234) or some other non-existing
665 * Efoo - or perhaps CONFIG_SYMBOLIC_ERRNAME=n. Fall back to
666 * printing it as its decimal representation.
670 return number(buf, end, err, spec);
673 /* Be careful: error messages must fit into the given buffer. */
674 static char *error_string(char *buf, char *end, const char *s,
675 struct printf_spec spec)
678 * Hard limit to avoid a completely insane messages. It actually
679 * works pretty well because most error messages are in
680 * the many pointer format modifiers.
682 if (spec.precision == -1)
683 spec.precision = 2 * sizeof(void *);
685 return string_nocheck(buf, end, s, spec);
689 * Do not call any complex external code here. Nested printk()/vsprintf()
690 * might cause infinite loops. Failures might break printk() and would
693 static const char *check_pointer_msg(const void *ptr)
698 if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
704 static int check_pointer(char **buf, char *end, const void *ptr,
705 struct printf_spec spec)
709 err_msg = check_pointer_msg(ptr);
711 *buf = error_string(*buf, end, err_msg, spec);
718 static noinline_for_stack
719 char *string(char *buf, char *end, const char *s,
720 struct printf_spec spec)
722 if (check_pointer(&buf, end, s, spec))
725 return string_nocheck(buf, end, s, spec);
728 static char *pointer_string(char *buf, char *end,
730 struct printf_spec spec)
734 if (spec.field_width == -1) {
735 spec.field_width = 2 * sizeof(ptr);
736 spec.flags |= ZEROPAD;
739 return number(buf, end, (unsigned long int)ptr, spec);
742 /* Make pointers available for printing early in the boot sequence. */
743 static int debug_boot_weak_hash __ro_after_init;
745 static int __init debug_boot_weak_hash_enable(char *str)
747 debug_boot_weak_hash = 1;
748 pr_info("debug_boot_weak_hash enabled\n");
751 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
753 static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
754 static siphash_key_t ptr_key __read_mostly;
756 static void enable_ptr_key_workfn(struct work_struct *work)
758 get_random_bytes(&ptr_key, sizeof(ptr_key));
759 /* Needs to run from preemptible context */
760 static_branch_disable(¬_filled_random_ptr_key);
763 static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
765 static void fill_random_ptr_key(struct random_ready_callback *unused)
767 /* This may be in an interrupt handler. */
768 queue_work(system_unbound_wq, &enable_ptr_key_work);
771 static struct random_ready_callback random_ready = {
772 .func = fill_random_ptr_key
775 static int __init initialize_ptr_random(void)
777 int key_size = sizeof(ptr_key);
780 /* Use hw RNG if available. */
781 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
782 static_branch_disable(¬_filled_random_ptr_key);
786 ret = add_random_ready_callback(&random_ready);
789 } else if (ret == -EALREADY) {
790 /* This is in preemptible context */
791 enable_ptr_key_workfn(&enable_ptr_key_work);
797 early_initcall(initialize_ptr_random);
799 /* Maps a pointer to a 32 bit unique identifier. */
800 static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
802 unsigned long hashval;
804 if (static_branch_unlikely(¬_filled_random_ptr_key))
808 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
810 * Mask off the first 32 bits, this makes explicit that we have
811 * modified the address (and 32 bits is plenty for a unique ID).
813 hashval = hashval & 0xffffffff;
815 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
817 *hashval_out = hashval;
821 int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
823 return __ptr_to_hashval(ptr, hashval_out);
826 static char *ptr_to_id(char *buf, char *end, const void *ptr,
827 struct printf_spec spec)
829 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
830 unsigned long hashval;
834 * Print the real pointer value for NULL and error pointers,
835 * as they are not actual addresses.
837 if (IS_ERR_OR_NULL(ptr))
838 return pointer_string(buf, end, ptr, spec);
840 /* When debugging early boot use non-cryptographically secure hash. */
841 if (unlikely(debug_boot_weak_hash)) {
842 hashval = hash_long((unsigned long)ptr, 32);
843 return pointer_string(buf, end, (const void *)hashval, spec);
846 ret = __ptr_to_hashval(ptr, &hashval);
848 spec.field_width = 2 * sizeof(ptr);
849 /* string length must be less than default_width */
850 return error_string(buf, end, str, spec);
853 return pointer_string(buf, end, (const void *)hashval, spec);
856 static char *default_pointer(char *buf, char *end, const void *ptr,
857 struct printf_spec spec)
860 * default is to _not_ leak addresses, so hash before printing,
861 * unless no_hash_pointers is specified on the command line.
863 if (unlikely(no_hash_pointers))
864 return pointer_string(buf, end, ptr, spec);
866 return ptr_to_id(buf, end, ptr, spec);
869 int kptr_restrict __read_mostly;
871 static noinline_for_stack
872 char *restricted_pointer(char *buf, char *end, const void *ptr,
873 struct printf_spec spec)
875 switch (kptr_restrict) {
877 /* Handle as %p, hash and do _not_ leak addresses. */
878 return default_pointer(buf, end, ptr, spec);
880 const struct cred *cred;
883 * kptr_restrict==1 cannot be used in IRQ context
884 * because its test for CAP_SYSLOG would be meaningless.
886 if (in_irq() || in_serving_softirq() || in_nmi()) {
887 if (spec.field_width == -1)
888 spec.field_width = 2 * sizeof(ptr);
889 return error_string(buf, end, "pK-error", spec);
893 * Only print the real pointer value if the current
894 * process has CAP_SYSLOG and is running with the
895 * same credentials it started with. This is because
896 * access to files is checked at open() time, but %pK
897 * checks permission at read() time. We don't want to
898 * leak pointer values if a binary opens a file using
899 * %pK and then elevates privileges before reading it.
901 cred = current_cred();
902 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
903 !uid_eq(cred->euid, cred->uid) ||
904 !gid_eq(cred->egid, cred->gid))
910 /* Always print 0's for %pK */
915 return pointer_string(buf, end, ptr, spec);
918 static noinline_for_stack
919 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
922 const char *array[4], *s;
923 const struct dentry *p;
928 case '2': case '3': case '4':
929 depth = fmt[1] - '0';
936 for (i = 0; i < depth; i++, d = p) {
937 if (check_pointer(&buf, end, d, spec)) {
942 p = READ_ONCE(d->d_parent);
943 array[i] = READ_ONCE(d->d_name.name);
952 for (n = 0; n != spec.precision; n++, buf++) {
964 return widen_string(buf, n, end, spec);
967 static noinline_for_stack
968 char *file_dentry_name(char *buf, char *end, const struct file *f,
969 struct printf_spec spec, const char *fmt)
971 if (check_pointer(&buf, end, f, spec))
974 return dentry_name(buf, end, f->f_path.dentry, spec, fmt);
977 static noinline_for_stack
978 char *bdev_name(char *buf, char *end, struct block_device *bdev,
979 struct printf_spec spec, const char *fmt)
983 if (check_pointer(&buf, end, bdev, spec))
987 buf = string(buf, end, hd->disk_name, spec);
988 if (bdev->bd_partno) {
989 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
994 buf = number(buf, end, bdev->bd_partno, spec);
1000 static noinline_for_stack
1001 char *symbol_string(char *buf, char *end, void *ptr,
1002 struct printf_spec spec, const char *fmt)
1004 unsigned long value;
1005 #ifdef CONFIG_KALLSYMS
1006 char sym[KSYM_SYMBOL_LEN];
1010 ptr = __builtin_extract_return_addr(ptr);
1011 value = (unsigned long)ptr;
1013 #ifdef CONFIG_KALLSYMS
1014 if (*fmt == 'B' && fmt[1] == 'b')
1015 sprint_backtrace_build_id(sym, value);
1016 else if (*fmt == 'B')
1017 sprint_backtrace(sym, value);
1018 else if (*fmt == 'S' && (fmt[1] == 'b' || (fmt[1] == 'R' && fmt[2] == 'b')))
1019 sprint_symbol_build_id(sym, value);
1020 else if (*fmt != 's')
1021 sprint_symbol(sym, value);
1023 sprint_symbol_no_offset(sym, value);
1025 return string_nocheck(buf, end, sym, spec);
1027 return special_hex_number(buf, end, value, sizeof(void *));
1031 static const struct printf_spec default_str_spec = {
1036 static const struct printf_spec default_flag_spec = {
1039 .flags = SPECIAL | SMALL,
1042 static const struct printf_spec default_dec_spec = {
1047 static const struct printf_spec default_dec02_spec = {
1054 static const struct printf_spec default_dec04_spec = {
1061 static noinline_for_stack
1062 char *resource_string(char *buf, char *end, struct resource *res,
1063 struct printf_spec spec, const char *fmt)
1065 #ifndef IO_RSRC_PRINTK_SIZE
1066 #define IO_RSRC_PRINTK_SIZE 6
1069 #ifndef MEM_RSRC_PRINTK_SIZE
1070 #define MEM_RSRC_PRINTK_SIZE 10
1072 static const struct printf_spec io_spec = {
1074 .field_width = IO_RSRC_PRINTK_SIZE,
1076 .flags = SPECIAL | SMALL | ZEROPAD,
1078 static const struct printf_spec mem_spec = {
1080 .field_width = MEM_RSRC_PRINTK_SIZE,
1082 .flags = SPECIAL | SMALL | ZEROPAD,
1084 static const struct printf_spec bus_spec = {
1088 .flags = SMALL | ZEROPAD,
1090 static const struct printf_spec str_spec = {
1096 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
1097 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
1098 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
1099 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
1100 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
1101 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
1102 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
1103 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
1105 char *p = sym, *pend = sym + sizeof(sym);
1106 int decode = (fmt[0] == 'R') ? 1 : 0;
1107 const struct printf_spec *specp;
1109 if (check_pointer(&buf, end, res, spec))
1113 if (res->flags & IORESOURCE_IO) {
1114 p = string_nocheck(p, pend, "io ", str_spec);
1116 } else if (res->flags & IORESOURCE_MEM) {
1117 p = string_nocheck(p, pend, "mem ", str_spec);
1119 } else if (res->flags & IORESOURCE_IRQ) {
1120 p = string_nocheck(p, pend, "irq ", str_spec);
1121 specp = &default_dec_spec;
1122 } else if (res->flags & IORESOURCE_DMA) {
1123 p = string_nocheck(p, pend, "dma ", str_spec);
1124 specp = &default_dec_spec;
1125 } else if (res->flags & IORESOURCE_BUS) {
1126 p = string_nocheck(p, pend, "bus ", str_spec);
1129 p = string_nocheck(p, pend, "??? ", str_spec);
1133 if (decode && res->flags & IORESOURCE_UNSET) {
1134 p = string_nocheck(p, pend, "size ", str_spec);
1135 p = number(p, pend, resource_size(res), *specp);
1137 p = number(p, pend, res->start, *specp);
1138 if (res->start != res->end) {
1140 p = number(p, pend, res->end, *specp);
1144 if (res->flags & IORESOURCE_MEM_64)
1145 p = string_nocheck(p, pend, " 64bit", str_spec);
1146 if (res->flags & IORESOURCE_PREFETCH)
1147 p = string_nocheck(p, pend, " pref", str_spec);
1148 if (res->flags & IORESOURCE_WINDOW)
1149 p = string_nocheck(p, pend, " window", str_spec);
1150 if (res->flags & IORESOURCE_DISABLED)
1151 p = string_nocheck(p, pend, " disabled", str_spec);
1153 p = string_nocheck(p, pend, " flags ", str_spec);
1154 p = number(p, pend, res->flags, default_flag_spec);
1159 return string_nocheck(buf, end, sym, spec);
1162 static noinline_for_stack
1163 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1166 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
1167 negative value, fallback to the default */
1170 if (spec.field_width == 0)
1171 /* nothing to print */
1174 if (check_pointer(&buf, end, addr, spec))
1192 if (spec.field_width > 0)
1193 len = min_t(int, spec.field_width, 64);
1195 for (i = 0; i < len; ++i) {
1197 *buf = hex_asc_hi(addr[i]);
1200 *buf = hex_asc_lo(addr[i]);
1203 if (separator && i != len - 1) {
1213 static noinline_for_stack
1214 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1215 struct printf_spec spec, const char *fmt)
1217 const int CHUNKSZ = 32;
1218 int nr_bits = max_t(int, spec.field_width, 0);
1222 if (check_pointer(&buf, end, bitmap, spec))
1225 /* reused to print numbers */
1226 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1228 chunksz = nr_bits & (CHUNKSZ - 1);
1232 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1233 for (; i >= 0; i -= CHUNKSZ) {
1237 chunkmask = ((1ULL << chunksz) - 1);
1238 word = i / BITS_PER_LONG;
1239 bit = i % BITS_PER_LONG;
1240 val = (bitmap[word] >> bit) & chunkmask;
1249 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1250 buf = number(buf, end, val, spec);
1257 static noinline_for_stack
1258 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1259 struct printf_spec spec, const char *fmt)
1261 int nr_bits = max_t(int, spec.field_width, 0);
1265 if (check_pointer(&buf, end, bitmap, spec))
1268 for_each_set_bitrange(rbot, rtop, bitmap, nr_bits) {
1276 buf = number(buf, end, rbot, default_dec_spec);
1277 if (rtop == rbot + 1)
1282 buf = number(++buf, end, rtop - 1, default_dec_spec);
1287 static noinline_for_stack
1288 char *mac_address_string(char *buf, char *end, u8 *addr,
1289 struct printf_spec spec, const char *fmt)
1291 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
1295 bool reversed = false;
1297 if (check_pointer(&buf, end, addr, spec))
1314 for (i = 0; i < 6; i++) {
1316 p = hex_byte_pack(p, addr[5 - i]);
1318 p = hex_byte_pack(p, addr[i]);
1320 if (fmt[0] == 'M' && i != 5)
1325 return string_nocheck(buf, end, mac_addr, spec);
1328 static noinline_for_stack
1329 char *ip4_string(char *p, const u8 *addr, const char *fmt)
1332 bool leading_zeros = (fmt[0] == 'i');
1357 for (i = 0; i < 4; i++) {
1358 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
1359 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1360 if (leading_zeros) {
1366 /* reverse the digits in the quad */
1368 *p++ = temp[digits];
1378 static noinline_for_stack
1379 char *ip6_compressed_string(char *p, const char *addr)
1382 unsigned char zerolength[8];
1387 bool needcolon = false;
1389 struct in6_addr in6;
1391 memcpy(&in6, addr, sizeof(struct in6_addr));
1393 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1395 memset(zerolength, 0, sizeof(zerolength));
1402 /* find position of longest 0 run */
1403 for (i = 0; i < range; i++) {
1404 for (j = i; j < range; j++) {
1405 if (in6.s6_addr16[j] != 0)
1410 for (i = 0; i < range; i++) {
1411 if (zerolength[i] > longest) {
1412 longest = zerolength[i];
1416 if (longest == 1) /* don't compress a single 0 */
1420 for (i = 0; i < range; i++) {
1421 if (i == colonpos) {
1422 if (needcolon || i == 0)
1433 /* hex u16 without leading 0s */
1434 word = ntohs(in6.s6_addr16[i]);
1439 p = hex_byte_pack(p, hi);
1441 *p++ = hex_asc_lo(hi);
1442 p = hex_byte_pack(p, lo);
1445 p = hex_byte_pack(p, lo);
1447 *p++ = hex_asc_lo(lo);
1454 p = ip4_string(p, &in6.s6_addr[12], "I4");
1461 static noinline_for_stack
1462 char *ip6_string(char *p, const char *addr, const char *fmt)
1466 for (i = 0; i < 8; i++) {
1467 p = hex_byte_pack(p, *addr++);
1468 p = hex_byte_pack(p, *addr++);
1469 if (fmt[0] == 'I' && i != 7)
1477 static noinline_for_stack
1478 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1479 struct printf_spec spec, const char *fmt)
1481 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1483 if (fmt[0] == 'I' && fmt[2] == 'c')
1484 ip6_compressed_string(ip6_addr, addr);
1486 ip6_string(ip6_addr, addr, fmt);
1488 return string_nocheck(buf, end, ip6_addr, spec);
1491 static noinline_for_stack
1492 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1493 struct printf_spec spec, const char *fmt)
1495 char ip4_addr[sizeof("255.255.255.255")];
1497 ip4_string(ip4_addr, addr, fmt);
1499 return string_nocheck(buf, end, ip4_addr, spec);
1502 static noinline_for_stack
1503 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1504 struct printf_spec spec, const char *fmt)
1506 bool have_p = false, have_s = false, have_f = false, have_c = false;
1507 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1508 sizeof(":12345") + sizeof("/123456789") +
1509 sizeof("%1234567890")];
1510 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1511 const u8 *addr = (const u8 *) &sa->sin6_addr;
1512 char fmt6[2] = { fmt[0], '6' };
1516 while (isalpha(*++fmt)) {
1533 if (have_p || have_s || have_f) {
1538 if (fmt6[0] == 'I' && have_c)
1539 p = ip6_compressed_string(ip6_addr + off, addr);
1541 p = ip6_string(ip6_addr + off, addr, fmt6);
1543 if (have_p || have_s || have_f)
1548 p = number(p, pend, ntohs(sa->sin6_port), spec);
1552 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1553 IPV6_FLOWINFO_MASK), spec);
1557 p = number(p, pend, sa->sin6_scope_id, spec);
1561 return string_nocheck(buf, end, ip6_addr, spec);
1564 static noinline_for_stack
1565 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1566 struct printf_spec spec, const char *fmt)
1568 bool have_p = false;
1569 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1570 char *pend = ip4_addr + sizeof(ip4_addr);
1571 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1572 char fmt4[3] = { fmt[0], '4', 0 };
1575 while (isalpha(*++fmt)) {
1589 p = ip4_string(ip4_addr, addr, fmt4);
1592 p = number(p, pend, ntohs(sa->sin_port), spec);
1596 return string_nocheck(buf, end, ip4_addr, spec);
1599 static noinline_for_stack
1600 char *ip_addr_string(char *buf, char *end, const void *ptr,
1601 struct printf_spec spec, const char *fmt)
1605 if (check_pointer(&buf, end, ptr, spec))
1610 return ip6_addr_string(buf, end, ptr, spec, fmt);
1612 return ip4_addr_string(buf, end, ptr, spec, fmt);
1615 struct sockaddr raw;
1616 struct sockaddr_in v4;
1617 struct sockaddr_in6 v6;
1620 switch (sa->raw.sa_family) {
1622 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1624 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1626 return error_string(buf, end, "(einval)", spec);
1630 err_fmt_msg = fmt[0] == 'i' ? "(%pi?)" : "(%pI?)";
1631 return error_string(buf, end, err_fmt_msg, spec);
1634 static noinline_for_stack
1635 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1640 unsigned int flags = 0;
1643 if (spec.field_width == 0)
1644 return buf; /* nothing to print */
1646 if (check_pointer(&buf, end, addr, spec))
1650 switch (fmt[count++]) {
1652 flags |= ESCAPE_ANY;
1655 flags |= ESCAPE_SPECIAL;
1658 flags |= ESCAPE_HEX;
1661 flags |= ESCAPE_NULL;
1664 flags |= ESCAPE_OCTAL;
1670 flags |= ESCAPE_SPACE;
1679 flags = ESCAPE_ANY_NP;
1681 len = spec.field_width < 0 ? 1 : spec.field_width;
1684 * string_escape_mem() writes as many characters as it can to
1685 * the given buffer, and returns the total size of the output
1686 * had the buffer been big enough.
1688 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1693 static char *va_format(char *buf, char *end, struct va_format *va_fmt,
1694 struct printf_spec spec, const char *fmt)
1698 if (check_pointer(&buf, end, va_fmt, spec))
1701 va_copy(va, *va_fmt->va);
1702 buf += vsnprintf(buf, end > buf ? end - buf : 0, va_fmt->fmt, va);
1708 static noinline_for_stack
1709 char *uuid_string(char *buf, char *end, const u8 *addr,
1710 struct printf_spec spec, const char *fmt)
1712 char uuid[UUID_STRING_LEN + 1];
1715 const u8 *index = uuid_index;
1718 if (check_pointer(&buf, end, addr, spec))
1733 for (i = 0; i < 16; i++) {
1735 p = hex_byte_pack_upper(p, addr[index[i]]);
1737 p = hex_byte_pack(p, addr[index[i]]);
1750 return string_nocheck(buf, end, uuid, spec);
1753 static noinline_for_stack
1754 char *netdev_bits(char *buf, char *end, const void *addr,
1755 struct printf_spec spec, const char *fmt)
1757 unsigned long long num;
1760 if (check_pointer(&buf, end, addr, spec))
1765 num = *(const netdev_features_t *)addr;
1766 size = sizeof(netdev_features_t);
1769 return error_string(buf, end, "(%pN?)", spec);
1772 return special_hex_number(buf, end, num, size);
1775 static noinline_for_stack
1776 char *fourcc_string(char *buf, char *end, const u32 *fourcc,
1777 struct printf_spec spec, const char *fmt)
1779 char output[sizeof("0123 little-endian (0x01234567)")];
1784 if (fmt[1] != 'c' || fmt[2] != 'c')
1785 return error_string(buf, end, "(%p4?)", spec);
1787 if (check_pointer(&buf, end, fourcc, spec))
1790 orig = get_unaligned(fourcc);
1791 val = orig & ~BIT(31);
1793 for (i = 0; i < sizeof(u32); i++) {
1794 unsigned char c = val >> (i * 8);
1796 /* Print non-control ASCII characters as-is, dot otherwise */
1797 *p++ = isascii(c) && isprint(c) ? c : '.';
1800 strcpy(p, orig & BIT(31) ? " big-endian" : " little-endian");
1805 p = special_hex_number(p, output + sizeof(output) - 2, orig, sizeof(u32));
1809 return string(buf, end, output, spec);
1812 static noinline_for_stack
1813 char *address_val(char *buf, char *end, const void *addr,
1814 struct printf_spec spec, const char *fmt)
1816 unsigned long long num;
1819 if (check_pointer(&buf, end, addr, spec))
1824 num = *(const dma_addr_t *)addr;
1825 size = sizeof(dma_addr_t);
1829 num = *(const phys_addr_t *)addr;
1830 size = sizeof(phys_addr_t);
1834 return special_hex_number(buf, end, num, size);
1837 static noinline_for_stack
1838 char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1840 int year = tm->tm_year + (r ? 0 : 1900);
1841 int mon = tm->tm_mon + (r ? 0 : 1);
1843 buf = number(buf, end, year, default_dec04_spec);
1848 buf = number(buf, end, mon, default_dec02_spec);
1853 return number(buf, end, tm->tm_mday, default_dec02_spec);
1856 static noinline_for_stack
1857 char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1859 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1864 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1869 return number(buf, end, tm->tm_sec, default_dec02_spec);
1872 static noinline_for_stack
1873 char *rtc_str(char *buf, char *end, const struct rtc_time *tm,
1874 struct printf_spec spec, const char *fmt)
1876 bool have_t = true, have_d = true;
1877 bool raw = false, iso8601_separator = true;
1881 if (check_pointer(&buf, end, tm, spec))
1884 switch (fmt[count]) {
1896 switch (fmt[count++]) {
1901 iso8601_separator = false;
1910 buf = date_str(buf, end, tm, raw);
1911 if (have_d && have_t) {
1913 *buf = iso8601_separator ? 'T' : ' ';
1917 buf = time_str(buf, end, tm, raw);
1922 static noinline_for_stack
1923 char *time64_str(char *buf, char *end, const time64_t time,
1924 struct printf_spec spec, const char *fmt)
1926 struct rtc_time rtc_time;
1929 time64_to_tm(time, 0, &tm);
1931 rtc_time.tm_sec = tm.tm_sec;
1932 rtc_time.tm_min = tm.tm_min;
1933 rtc_time.tm_hour = tm.tm_hour;
1934 rtc_time.tm_mday = tm.tm_mday;
1935 rtc_time.tm_mon = tm.tm_mon;
1936 rtc_time.tm_year = tm.tm_year;
1937 rtc_time.tm_wday = tm.tm_wday;
1938 rtc_time.tm_yday = tm.tm_yday;
1940 rtc_time.tm_isdst = 0;
1942 return rtc_str(buf, end, &rtc_time, spec, fmt);
1945 static noinline_for_stack
1946 char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1951 return rtc_str(buf, end, (const struct rtc_time *)ptr, spec, fmt);
1953 return time64_str(buf, end, *(const time64_t *)ptr, spec, fmt);
1955 return error_string(buf, end, "(%pt?)", spec);
1959 static noinline_for_stack
1960 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1963 if (!IS_ENABLED(CONFIG_HAVE_CLK))
1964 return error_string(buf, end, "(%pC?)", spec);
1966 if (check_pointer(&buf, end, clk, spec))
1972 #ifdef CONFIG_COMMON_CLK
1973 return string(buf, end, __clk_get_name(clk), spec);
1975 return ptr_to_id(buf, end, clk, spec);
1981 char *format_flags(char *buf, char *end, unsigned long flags,
1982 const struct trace_print_flags *names)
1986 for ( ; flags && names->name; names++) {
1988 if ((flags & mask) != mask)
1991 buf = string(buf, end, names->name, default_str_spec);
2002 buf = number(buf, end, flags, default_flag_spec);
2007 struct page_flags_fields {
2011 const struct printf_spec *spec;
2015 static const struct page_flags_fields pff[] = {
2016 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SECTIONS_MASK,
2017 &default_dec_spec, "section"},
2018 {NODES_WIDTH, NODES_PGSHIFT, NODES_MASK,
2019 &default_dec_spec, "node"},
2020 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MASK,
2021 &default_dec_spec, "zone"},
2022 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHIFT, LAST_CPUPID_MASK,
2023 &default_flag_spec, "lastcpupid"},
2024 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, KASAN_TAG_MASK,
2025 &default_flag_spec, "kasantag"},
2029 char *format_page_flags(char *buf, char *end, unsigned long flags)
2031 unsigned long main_flags = flags & PAGEFLAGS_MASK;
2032 bool append = false;
2035 buf = number(buf, end, flags, default_flag_spec);
2040 /* Page flags from the main area. */
2042 buf = format_flags(buf, end, main_flags, pageflag_names);
2046 /* Page flags from the fields area */
2047 for (i = 0; i < ARRAY_SIZE(pff); i++) {
2048 /* Skip undefined fields. */
2052 /* Format: Flag Name + '=' (equals sign) + Number + '|' (separator) */
2059 buf = string(buf, end, pff[i].name, default_str_spec);
2063 buf = number(buf, end, (flags >> pff[i].shift) & pff[i].mask,
2075 static noinline_for_stack
2076 char *flags_string(char *buf, char *end, void *flags_ptr,
2077 struct printf_spec spec, const char *fmt)
2079 unsigned long flags;
2080 const struct trace_print_flags *names;
2082 if (check_pointer(&buf, end, flags_ptr, spec))
2087 return format_page_flags(buf, end, *(unsigned long *)flags_ptr);
2089 flags = *(unsigned long *)flags_ptr;
2090 names = vmaflag_names;
2093 flags = (__force unsigned long)(*(gfp_t *)flags_ptr);
2094 names = gfpflag_names;
2097 return error_string(buf, end, "(%pG?)", spec);
2100 return format_flags(buf, end, flags, names);
2103 static noinline_for_stack
2104 char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
2109 /* Loop starting from the root node to the current node. */
2110 for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
2111 struct fwnode_handle *__fwnode =
2112 fwnode_get_nth_parent(fwnode, depth);
2114 buf = string(buf, end, fwnode_get_name_prefix(__fwnode),
2116 buf = string(buf, end, fwnode_get_name(__fwnode),
2119 fwnode_handle_put(__fwnode);
2125 static noinline_for_stack
2126 char *device_node_string(char *buf, char *end, struct device_node *dn,
2127 struct printf_spec spec, const char *fmt)
2129 char tbuf[sizeof("xxxx") + 1];
2132 char *buf_start = buf;
2133 struct property *prop;
2134 bool has_mult, pass;
2136 struct printf_spec str_spec = spec;
2137 str_spec.field_width = -1;
2140 return error_string(buf, end, "(%pO?)", spec);
2142 if (!IS_ENABLED(CONFIG_OF))
2143 return error_string(buf, end, "(%pOF?)", spec);
2145 if (check_pointer(&buf, end, dn, spec))
2148 /* simple case without anything any more format specifiers */
2150 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
2153 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
2162 case 'f': /* full_name */
2163 buf = fwnode_full_name_string(of_fwnode_handle(dn), buf,
2166 case 'n': /* name */
2167 p = fwnode_get_name(of_fwnode_handle(dn));
2168 precision = str_spec.precision;
2169 str_spec.precision = strchrnul(p, '@') - p;
2170 buf = string(buf, end, p, str_spec);
2171 str_spec.precision = precision;
2173 case 'p': /* phandle */
2174 buf = number(buf, end, (unsigned int)dn->phandle, default_dec_spec);
2176 case 'P': /* path-spec */
2177 p = fwnode_get_name(of_fwnode_handle(dn));
2180 buf = string(buf, end, p, str_spec);
2182 case 'F': /* flags */
2183 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
2184 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
2185 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
2186 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
2188 buf = string_nocheck(buf, end, tbuf, str_spec);
2190 case 'c': /* major compatible string */
2191 ret = of_property_read_string(dn, "compatible", &p);
2193 buf = string(buf, end, p, str_spec);
2195 case 'C': /* full compatible string */
2197 of_property_for_each_string(dn, "compatible", prop, p) {
2199 buf = string_nocheck(buf, end, ",", str_spec);
2200 buf = string_nocheck(buf, end, "\"", str_spec);
2201 buf = string(buf, end, p, str_spec);
2202 buf = string_nocheck(buf, end, "\"", str_spec);
2212 return widen_string(buf, buf - buf_start, end, spec);
2215 static noinline_for_stack
2216 char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
2217 struct printf_spec spec, const char *fmt)
2219 struct printf_spec str_spec = spec;
2220 char *buf_start = buf;
2222 str_spec.field_width = -1;
2225 return error_string(buf, end, "(%pf?)", spec);
2227 if (check_pointer(&buf, end, fwnode, spec))
2233 case 'P': /* name */
2234 buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
2236 case 'f': /* full_name */
2238 buf = fwnode_full_name_string(fwnode, buf, end);
2242 return widen_string(buf, buf - buf_start, end, spec);
2245 int __init no_hash_pointers_enable(char *str)
2247 if (no_hash_pointers)
2250 no_hash_pointers = true;
2252 pr_warn("**********************************************************\n");
2253 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2255 pr_warn("** This system shows unhashed kernel memory addresses **\n");
2256 pr_warn("** via the console, logs, and other interfaces. This **\n");
2257 pr_warn("** might reduce the security of your system. **\n");
2259 pr_warn("** If you see this message and you are not debugging **\n");
2260 pr_warn("** the kernel, report this immediately to your system **\n");
2261 pr_warn("** administrator! **\n");
2263 pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
2264 pr_warn("**********************************************************\n");
2268 early_param("no_hash_pointers", no_hash_pointers_enable);
2271 * Show a '%p' thing. A kernel extension is that the '%p' is followed
2272 * by an extra set of alphanumeric characters that are extended format
2275 * Please update scripts/checkpatch.pl when adding/removing conversion
2276 * characters. (Search for "check for vsprintf extension").
2278 * Right now we handle:
2280 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2281 * - 's' For symbolic direct pointers (or function descriptors) without offset
2282 * - '[Ss]R' as above with __builtin_extract_return_addr() translation
2283 * - 'S[R]b' as above with module build ID (for use in backtraces)
2284 * - '[Ff]' %pf and %pF were obsoleted and later removed in favor of
2285 * %ps and %pS. Be careful when re-using these specifiers.
2286 * - 'B' For backtraced symbolic direct pointers with offset
2287 * - 'Bb' as above with module build ID (for use in backtraces)
2288 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2289 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
2290 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2291 * width which must be explicitly specified either as part of the
2292 * format string '%32b[l]' or through '%*b[l]', [l] selects
2293 * range-list format instead of hex format
2294 * - 'M' For a 6-byte MAC address, it prints the address in the
2295 * usual colon-separated hex notation
2296 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
2297 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
2298 * with a dash-separated hex notation
2299 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
2300 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2301 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2302 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
2304 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2305 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2306 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2307 * IPv6 omits the colons (01020304...0f)
2308 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
2310 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2311 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2312 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2313 * - 'I[6S]c' for IPv6 addresses printed as specified by
2314 * https://tools.ietf.org/html/rfc5952
2315 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2316 * of the following flags (see string_escape_mem() for the
2319 * c - ESCAPE_SPECIAL
2325 * By default ESCAPE_ANY_NP is used.
2326 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2327 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2328 * Options for %pU are:
2329 * b big endian lower case hex (default)
2330 * B big endian UPPER case hex
2331 * l little endian lower case hex
2332 * L little endian UPPER case hex
2333 * big endian output byte order is:
2334 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2335 * little endian output byte order is:
2336 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
2337 * - 'V' For a struct va_format which contains a format string * and va_list *,
2338 * call vsnprintf(->format, *->va_list).
2339 * Implements a "recursive vsnprintf".
2340 * Do not use this feature without some mechanism to verify the
2341 * correctness of the format string and va_list arguments.
2342 * - 'K' For a kernel pointer that should be hidden from unprivileged users.
2343 * Use only for procfs, sysfs and similar files, not printk(); please
2344 * read the documentation (path below) first.
2345 * - 'NF' For a netdev_features_t
2346 * - '4cc' V4L2 or DRM FourCC code, with endianness and raw numerical value.
2347 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2348 * a certain separator (' ' by default):
2352 * The maximum supported length is 64 bytes of the input. Consider
2353 * to use print_hex_dump() for the larger input.
2354 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2355 * (default assumed to be phys_addr_t, passed by reference)
2356 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2357 * - 'D[234]' Same as 'd' but for a struct file
2358 * - 'g' For block_device name (gendisk + partition number)
2359 * - 't[RT][dt][r][s]' For time and date as represented by:
2362 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2363 * (legacy clock framework) of the clock
2364 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2365 * (legacy clock framework) of the clock
2366 * - 'G' For flags to be printed as a collection of symbolic strings that would
2367 * construct the specific value. Supported flags given by option:
2368 * p page flags (see struct page) given as pointer to unsigned long
2369 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2370 * v vma flags (VM_*) given as pointer to unsigned long
2371 * - 'OF[fnpPcCF]' For a device tree object
2372 * Without any optional arguments prints the full_name
2373 * f device node full_name
2374 * n device node name
2375 * p device node phandle
2376 * P device node path spec (name + @unit)
2377 * F device node flags
2378 * c major compatible string
2379 * C full compatible string
2380 * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
2381 * Without an option prints the full name of the node
2383 * P node name, including a possible unit address
2384 * - 'x' For printing the address unmodified. Equivalent to "%lx".
2385 * Please read the documentation (path below) before using!
2386 * - '[ku]s' For a BPF/tracing related format specifier, e.g. used out of
2387 * bpf_trace_printk() where [ku] prefix specifies either kernel (k)
2388 * or user (u) memory to probe, and:
2389 * s a string, equivalent to "%s" on direct vsnprintf() use
2391 * ** When making changes please also update:
2392 * Documentation/core-api/printk-formats.rst
2394 * Note: The default behaviour (unadorned %p) is to hash the address,
2395 * rendering it useful as a unique identifier.
2397 static noinline_for_stack
2398 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2399 struct printf_spec spec)
2404 ptr = dereference_symbol_descriptor(ptr);
2407 return symbol_string(buf, end, ptr, spec, fmt);
2410 return resource_string(buf, end, ptr, spec, fmt);
2412 return hex_string(buf, end, ptr, spec, fmt);
2416 return bitmap_list_string(buf, end, ptr, spec, fmt);
2418 return bitmap_string(buf, end, ptr, spec, fmt);
2420 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2421 case 'm': /* Contiguous: 000102030405 */
2423 /* [mM]R (Reverse order; Bluetooth) */
2424 return mac_address_string(buf, end, ptr, spec, fmt);
2425 case 'I': /* Formatted IP supported
2427 * 6: 0001:0203:...:0708
2428 * 6c: 1::708 or 1::1.2.3.4
2430 case 'i': /* Contiguous:
2431 * 4: 001.002.003.004
2434 return ip_addr_string(buf, end, ptr, spec, fmt);
2436 return escaped_string(buf, end, ptr, spec, fmt);
2438 return uuid_string(buf, end, ptr, spec, fmt);
2440 return va_format(buf, end, ptr, spec, fmt);
2442 return restricted_pointer(buf, end, ptr, spec);
2444 return netdev_bits(buf, end, ptr, spec, fmt);
2446 return fourcc_string(buf, end, ptr, spec, fmt);
2448 return address_val(buf, end, ptr, spec, fmt);
2450 return dentry_name(buf, end, ptr, spec, fmt);
2452 return time_and_date(buf, end, ptr, spec, fmt);
2454 return clock(buf, end, ptr, spec, fmt);
2456 return file_dentry_name(buf, end, ptr, spec, fmt);
2459 return bdev_name(buf, end, ptr, spec, fmt);
2463 return flags_string(buf, end, ptr, spec, fmt);
2465 return device_node_string(buf, end, ptr, spec, fmt + 1);
2467 return fwnode_string(buf, end, ptr, spec, fmt + 1);
2469 return pointer_string(buf, end, ptr, spec);
2471 /* %pe with a non-ERR_PTR gets treated as plain %p */
2473 return default_pointer(buf, end, ptr, spec);
2474 return err_ptr(buf, end, ptr, spec);
2479 return string(buf, end, ptr, spec);
2481 return error_string(buf, end, "(einval)", spec);
2484 return default_pointer(buf, end, ptr, spec);
2489 * Helper function to decode printf style format.
2490 * Each call decode a token from the format and return the
2491 * number of characters read (or likely the delta where it wants
2492 * to go on the next call).
2493 * The decoded token is returned through the parameters
2495 * 'h', 'l', or 'L' for integer fields
2496 * 'z' support added 23/7/1999 S.H.
2497 * 'z' changed to 'Z' --davidm 1/25/99
2498 * 'Z' changed to 'z' --adobriyan 2017-01-25
2499 * 't' added for ptrdiff_t
2501 * @fmt: the format string
2502 * @type of the token returned
2503 * @flags: various flags such as +, -, # tokens..
2504 * @field_width: overwritten width
2505 * @base: base of the number (octal, hex, ...)
2506 * @precision: precision of a number
2507 * @qualifier: qualifier of a number (long, size_t, ...)
2509 static noinline_for_stack
2510 int format_decode(const char *fmt, struct printf_spec *spec)
2512 const char *start = fmt;
2515 /* we finished early by reading the field width */
2516 if (spec->type == FORMAT_TYPE_WIDTH) {
2517 if (spec->field_width < 0) {
2518 spec->field_width = -spec->field_width;
2519 spec->flags |= LEFT;
2521 spec->type = FORMAT_TYPE_NONE;
2525 /* we finished early by reading the precision */
2526 if (spec->type == FORMAT_TYPE_PRECISION) {
2527 if (spec->precision < 0)
2528 spec->precision = 0;
2530 spec->type = FORMAT_TYPE_NONE;
2535 spec->type = FORMAT_TYPE_NONE;
2537 for (; *fmt ; ++fmt) {
2542 /* Return the current non-format string */
2543 if (fmt != start || !*fmt)
2549 while (1) { /* this also skips first '%' */
2555 case '-': spec->flags |= LEFT; break;
2556 case '+': spec->flags |= PLUS; break;
2557 case ' ': spec->flags |= SPACE; break;
2558 case '#': spec->flags |= SPECIAL; break;
2559 case '0': spec->flags |= ZEROPAD; break;
2560 default: found = false;
2567 /* get field width */
2568 spec->field_width = -1;
2571 spec->field_width = skip_atoi(&fmt);
2572 else if (*fmt == '*') {
2573 /* it's the next argument */
2574 spec->type = FORMAT_TYPE_WIDTH;
2575 return ++fmt - start;
2579 /* get the precision */
2580 spec->precision = -1;
2583 if (isdigit(*fmt)) {
2584 spec->precision = skip_atoi(&fmt);
2585 if (spec->precision < 0)
2586 spec->precision = 0;
2587 } else if (*fmt == '*') {
2588 /* it's the next argument */
2589 spec->type = FORMAT_TYPE_PRECISION;
2590 return ++fmt - start;
2595 /* get the conversion qualifier */
2597 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2598 *fmt == 'z' || *fmt == 't') {
2600 if (unlikely(qualifier == *fmt)) {
2601 if (qualifier == 'l') {
2604 } else if (qualifier == 'h') {
2615 spec->type = FORMAT_TYPE_CHAR;
2616 return ++fmt - start;
2619 spec->type = FORMAT_TYPE_STR;
2620 return ++fmt - start;
2623 spec->type = FORMAT_TYPE_PTR;
2624 return ++fmt - start;
2627 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2628 return ++fmt - start;
2630 /* integer number formats - set up the flags and "break" */
2636 spec->flags |= SMALL;
2645 spec->flags |= SIGN;
2652 * Since %n poses a greater security risk than
2653 * utility, treat it as any other invalid or
2654 * unsupported format specifier.
2659 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
2660 spec->type = FORMAT_TYPE_INVALID;
2664 if (qualifier == 'L')
2665 spec->type = FORMAT_TYPE_LONG_LONG;
2666 else if (qualifier == 'l') {
2667 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2668 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
2669 } else if (qualifier == 'z') {
2670 spec->type = FORMAT_TYPE_SIZE_T;
2671 } else if (qualifier == 't') {
2672 spec->type = FORMAT_TYPE_PTRDIFF;
2673 } else if (qualifier == 'H') {
2674 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2675 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
2676 } else if (qualifier == 'h') {
2677 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2678 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
2680 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2681 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
2684 return ++fmt - start;
2688 set_field_width(struct printf_spec *spec, int width)
2690 spec->field_width = width;
2691 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2692 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2697 set_precision(struct printf_spec *spec, int prec)
2699 spec->precision = prec;
2700 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2701 spec->precision = clamp(prec, 0, PRECISION_MAX);
2706 * vsnprintf - Format a string and place it in a buffer
2707 * @buf: The buffer to place the result into
2708 * @size: The size of the buffer, including the trailing null space
2709 * @fmt: The format string to use
2710 * @args: Arguments for the format string
2712 * This function generally follows C99 vsnprintf, but has some
2713 * extensions and a few limitations:
2715 * - ``%n`` is unsupported
2716 * - ``%p*`` is handled by pointer()
2718 * See pointer() or Documentation/core-api/printk-formats.rst for more
2719 * extensive description.
2721 * **Please update the documentation in both places when making changes**
2723 * The return value is the number of characters which would
2724 * be generated for the given input, excluding the trailing
2725 * '\0', as per ISO C99. If you want to have the exact
2726 * number of characters written into @buf as return value
2727 * (not including the trailing '\0'), use vscnprintf(). If the
2728 * return is greater than or equal to @size, the resulting
2729 * string is truncated.
2731 * If you're not already dealing with a va_list consider using snprintf().
2733 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2735 unsigned long long num;
2737 struct printf_spec spec = {0};
2739 /* Reject out-of-range values early. Large positive sizes are
2740 used for unknown buffer sizes. */
2741 if (WARN_ON_ONCE(size > INT_MAX))
2747 /* Make sure end is always >= buf */
2754 const char *old_fmt = fmt;
2755 int read = format_decode(fmt, &spec);
2759 switch (spec.type) {
2760 case FORMAT_TYPE_NONE: {
2763 if (copy > end - str)
2765 memcpy(str, old_fmt, copy);
2771 case FORMAT_TYPE_WIDTH:
2772 set_field_width(&spec, va_arg(args, int));
2775 case FORMAT_TYPE_PRECISION:
2776 set_precision(&spec, va_arg(args, int));
2779 case FORMAT_TYPE_CHAR: {
2782 if (!(spec.flags & LEFT)) {
2783 while (--spec.field_width > 0) {
2790 c = (unsigned char) va_arg(args, int);
2794 while (--spec.field_width > 0) {
2802 case FORMAT_TYPE_STR:
2803 str = string(str, end, va_arg(args, char *), spec);
2806 case FORMAT_TYPE_PTR:
2807 str = pointer(fmt, str, end, va_arg(args, void *),
2809 while (isalnum(*fmt))
2813 case FORMAT_TYPE_PERCENT_CHAR:
2819 case FORMAT_TYPE_INVALID:
2821 * Presumably the arguments passed gcc's type
2822 * checking, but there is no safe or sane way
2823 * for us to continue parsing the format and
2824 * fetching from the va_list; the remaining
2825 * specifiers and arguments would be out of
2831 switch (spec.type) {
2832 case FORMAT_TYPE_LONG_LONG:
2833 num = va_arg(args, long long);
2835 case FORMAT_TYPE_ULONG:
2836 num = va_arg(args, unsigned long);
2838 case FORMAT_TYPE_LONG:
2839 num = va_arg(args, long);
2841 case FORMAT_TYPE_SIZE_T:
2842 if (spec.flags & SIGN)
2843 num = va_arg(args, ssize_t);
2845 num = va_arg(args, size_t);
2847 case FORMAT_TYPE_PTRDIFF:
2848 num = va_arg(args, ptrdiff_t);
2850 case FORMAT_TYPE_UBYTE:
2851 num = (unsigned char) va_arg(args, int);
2853 case FORMAT_TYPE_BYTE:
2854 num = (signed char) va_arg(args, int);
2856 case FORMAT_TYPE_USHORT:
2857 num = (unsigned short) va_arg(args, int);
2859 case FORMAT_TYPE_SHORT:
2860 num = (short) va_arg(args, int);
2862 case FORMAT_TYPE_INT:
2863 num = (int) va_arg(args, int);
2866 num = va_arg(args, unsigned int);
2869 str = number(str, end, num, spec);
2881 /* the trailing null byte doesn't count towards the total */
2885 EXPORT_SYMBOL(vsnprintf);
2888 * vscnprintf - Format a string and place it in a buffer
2889 * @buf: The buffer to place the result into
2890 * @size: The size of the buffer, including the trailing null space
2891 * @fmt: The format string to use
2892 * @args: Arguments for the format string
2894 * The return value is the number of characters which have been written into
2895 * the @buf not including the trailing '\0'. If @size is == 0 the function
2898 * If you're not already dealing with a va_list consider using scnprintf().
2900 * See the vsnprintf() documentation for format string extensions over C99.
2902 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2906 i = vsnprintf(buf, size, fmt, args);
2908 if (likely(i < size))
2914 EXPORT_SYMBOL(vscnprintf);
2917 * snprintf - Format a string and place it in a buffer
2918 * @buf: The buffer to place the result into
2919 * @size: The size of the buffer, including the trailing null space
2920 * @fmt: The format string to use
2921 * @...: Arguments for the format string
2923 * The return value is the number of characters which would be
2924 * generated for the given input, excluding the trailing null,
2925 * as per ISO C99. If the return is greater than or equal to
2926 * @size, the resulting string is truncated.
2928 * See the vsnprintf() documentation for format string extensions over C99.
2930 int snprintf(char *buf, size_t size, const char *fmt, ...)
2935 va_start(args, fmt);
2936 i = vsnprintf(buf, size, fmt, args);
2941 EXPORT_SYMBOL(snprintf);
2944 * scnprintf - Format a string and place it in a buffer
2945 * @buf: The buffer to place the result into
2946 * @size: The size of the buffer, including the trailing null space
2947 * @fmt: The format string to use
2948 * @...: Arguments for the format string
2950 * The return value is the number of characters written into @buf not including
2951 * the trailing '\0'. If @size is == 0 the function returns 0.
2954 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2959 va_start(args, fmt);
2960 i = vscnprintf(buf, size, fmt, args);
2965 EXPORT_SYMBOL(scnprintf);
2968 * vsprintf - Format a string and place it in a buffer
2969 * @buf: The buffer to place the result into
2970 * @fmt: The format string to use
2971 * @args: Arguments for the format string
2973 * The function returns the number of characters written
2974 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2977 * If you're not already dealing with a va_list consider using sprintf().
2979 * See the vsnprintf() documentation for format string extensions over C99.
2981 int vsprintf(char *buf, const char *fmt, va_list args)
2983 return vsnprintf(buf, INT_MAX, fmt, args);
2985 EXPORT_SYMBOL(vsprintf);
2988 * sprintf - Format a string and place it in a buffer
2989 * @buf: The buffer to place the result into
2990 * @fmt: The format string to use
2991 * @...: Arguments for the format string
2993 * The function returns the number of characters written
2994 * into @buf. Use snprintf() or scnprintf() in order to avoid
2997 * See the vsnprintf() documentation for format string extensions over C99.
2999 int sprintf(char *buf, const char *fmt, ...)
3004 va_start(args, fmt);
3005 i = vsnprintf(buf, INT_MAX, fmt, args);
3010 EXPORT_SYMBOL(sprintf);
3012 #ifdef CONFIG_BINARY_PRINTF
3015 * vbin_printf() - VA arguments to binary data
3016 * bstr_printf() - Binary data to text string
3020 * vbin_printf - Parse a format string and place args' binary value in a buffer
3021 * @bin_buf: The buffer to place args' binary value
3022 * @size: The size of the buffer(by words(32bits), not characters)
3023 * @fmt: The format string to use
3024 * @args: Arguments for the format string
3026 * The format follows C99 vsnprintf, except %n is ignored, and its argument
3029 * The return value is the number of words(32bits) which would be generated for
3033 * If the return value is greater than @size, the resulting bin_buf is NOT
3034 * valid for bstr_printf().
3036 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
3038 struct printf_spec spec = {0};
3042 str = (char *)bin_buf;
3043 end = (char *)(bin_buf + size);
3045 #define save_arg(type) \
3047 unsigned long long value; \
3048 if (sizeof(type) == 8) { \
3049 unsigned long long val8; \
3050 str = PTR_ALIGN(str, sizeof(u32)); \
3051 val8 = va_arg(args, unsigned long long); \
3052 if (str + sizeof(type) <= end) { \
3053 *(u32 *)str = *(u32 *)&val8; \
3054 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
3058 unsigned int val4; \
3059 str = PTR_ALIGN(str, sizeof(type)); \
3060 val4 = va_arg(args, int); \
3061 if (str + sizeof(type) <= end) \
3062 *(typeof(type) *)str = (type)(long)val4; \
3063 value = (unsigned long long)val4; \
3065 str += sizeof(type); \
3070 int read = format_decode(fmt, &spec);
3074 switch (spec.type) {
3075 case FORMAT_TYPE_NONE:
3076 case FORMAT_TYPE_PERCENT_CHAR:
3078 case FORMAT_TYPE_INVALID:
3081 case FORMAT_TYPE_WIDTH:
3082 case FORMAT_TYPE_PRECISION:
3083 width = (int)save_arg(int);
3084 /* Pointers may require the width */
3086 set_field_width(&spec, width);
3089 case FORMAT_TYPE_CHAR:
3093 case FORMAT_TYPE_STR: {
3094 const char *save_str = va_arg(args, char *);
3095 const char *err_msg;
3098 err_msg = check_pointer_msg(save_str);
3102 len = strlen(save_str) + 1;
3103 if (str + len < end)
3104 memcpy(str, save_str, len);
3109 case FORMAT_TYPE_PTR:
3110 /* Dereferenced pointers must be done now */
3112 /* Dereference of functions is still OK */
3121 if (!isalnum(*fmt)) {
3125 str = pointer(fmt, str, end, va_arg(args, void *),
3130 end[-1] = '\0'; /* Must be nul terminated */
3132 /* skip all alphanumeric pointer suffixes */
3133 while (isalnum(*fmt))
3138 switch (spec.type) {
3140 case FORMAT_TYPE_LONG_LONG:
3141 save_arg(long long);
3143 case FORMAT_TYPE_ULONG:
3144 case FORMAT_TYPE_LONG:
3145 save_arg(unsigned long);
3147 case FORMAT_TYPE_SIZE_T:
3150 case FORMAT_TYPE_PTRDIFF:
3151 save_arg(ptrdiff_t);
3153 case FORMAT_TYPE_UBYTE:
3154 case FORMAT_TYPE_BYTE:
3157 case FORMAT_TYPE_USHORT:
3158 case FORMAT_TYPE_SHORT:
3168 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
3171 EXPORT_SYMBOL_GPL(vbin_printf);
3174 * bstr_printf - Format a string from binary arguments and place it in a buffer
3175 * @buf: The buffer to place the result into
3176 * @size: The size of the buffer, including the trailing null space
3177 * @fmt: The format string to use
3178 * @bin_buf: Binary arguments for the format string
3180 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
3181 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
3182 * a binary buffer that generated by vbin_printf.
3184 * The format follows C99 vsnprintf, but has some extensions:
3185 * see vsnprintf comment for details.
3187 * The return value is the number of characters which would
3188 * be generated for the given input, excluding the trailing
3189 * '\0', as per ISO C99. If you want to have the exact
3190 * number of characters written into @buf as return value
3191 * (not including the trailing '\0'), use vscnprintf(). If the
3192 * return is greater than or equal to @size, the resulting
3193 * string is truncated.
3195 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
3197 struct printf_spec spec = {0};
3199 const char *args = (const char *)bin_buf;
3201 if (WARN_ON_ONCE(size > INT_MAX))
3207 #define get_arg(type) \
3209 typeof(type) value; \
3210 if (sizeof(type) == 8) { \
3211 args = PTR_ALIGN(args, sizeof(u32)); \
3212 *(u32 *)&value = *(u32 *)args; \
3213 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
3215 args = PTR_ALIGN(args, sizeof(type)); \
3216 value = *(typeof(type) *)args; \
3218 args += sizeof(type); \
3222 /* Make sure end is always >= buf */
3229 const char *old_fmt = fmt;
3230 int read = format_decode(fmt, &spec);
3234 switch (spec.type) {
3235 case FORMAT_TYPE_NONE: {
3238 if (copy > end - str)
3240 memcpy(str, old_fmt, copy);
3246 case FORMAT_TYPE_WIDTH:
3247 set_field_width(&spec, get_arg(int));
3250 case FORMAT_TYPE_PRECISION:
3251 set_precision(&spec, get_arg(int));
3254 case FORMAT_TYPE_CHAR: {
3257 if (!(spec.flags & LEFT)) {
3258 while (--spec.field_width > 0) {
3264 c = (unsigned char) get_arg(char);
3268 while (--spec.field_width > 0) {
3276 case FORMAT_TYPE_STR: {
3277 const char *str_arg = args;
3278 args += strlen(str_arg) + 1;
3279 str = string(str, end, (char *)str_arg, spec);
3283 case FORMAT_TYPE_PTR: {
3284 bool process = false;
3286 /* Non function dereferences were already done */
3296 if (!isalnum(*fmt)) {
3300 /* Pointer dereference was already processed */
3302 len = copy = strlen(args);
3303 if (copy > end - str)
3305 memcpy(str, args, copy);
3311 str = pointer(fmt, str, end, get_arg(void *), spec);
3313 while (isalnum(*fmt))
3318 case FORMAT_TYPE_PERCENT_CHAR:
3324 case FORMAT_TYPE_INVALID:
3328 unsigned long long num;
3330 switch (spec.type) {
3332 case FORMAT_TYPE_LONG_LONG:
3333 num = get_arg(long long);
3335 case FORMAT_TYPE_ULONG:
3336 case FORMAT_TYPE_LONG:
3337 num = get_arg(unsigned long);
3339 case FORMAT_TYPE_SIZE_T:
3340 num = get_arg(size_t);
3342 case FORMAT_TYPE_PTRDIFF:
3343 num = get_arg(ptrdiff_t);
3345 case FORMAT_TYPE_UBYTE:
3346 num = get_arg(unsigned char);
3348 case FORMAT_TYPE_BYTE:
3349 num = get_arg(signed char);
3351 case FORMAT_TYPE_USHORT:
3352 num = get_arg(unsigned short);
3354 case FORMAT_TYPE_SHORT:
3355 num = get_arg(short);
3357 case FORMAT_TYPE_UINT:
3358 num = get_arg(unsigned int);
3364 str = number(str, end, num, spec);
3366 } /* switch(spec.type) */
3379 /* the trailing null byte doesn't count towards the total */
3382 EXPORT_SYMBOL_GPL(bstr_printf);
3385 * bprintf - Parse a format string and place args' binary value in a buffer
3386 * @bin_buf: The buffer to place args' binary value
3387 * @size: The size of the buffer(by words(32bits), not characters)
3388 * @fmt: The format string to use
3389 * @...: Arguments for the format string
3391 * The function returns the number of words(u32) written
3394 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3399 va_start(args, fmt);
3400 ret = vbin_printf(bin_buf, size, fmt, args);
3405 EXPORT_SYMBOL_GPL(bprintf);
3407 #endif /* CONFIG_BINARY_PRINTF */
3410 * vsscanf - Unformat a buffer into a list of arguments
3411 * @buf: input buffer
3412 * @fmt: format of buffer
3415 int vsscanf(const char *buf, const char *fmt, va_list args)
3417 const char *str = buf;
3425 unsigned long long u;
3431 /* skip any white space in format */
3432 /* white space in format matches any amount of
3433 * white space, including none, in the input.
3435 if (isspace(*fmt)) {
3436 fmt = skip_spaces(++fmt);
3437 str = skip_spaces(str);
3440 /* anything that is not a conversion must match exactly */
3441 if (*fmt != '%' && *fmt) {
3442 if (*fmt++ != *str++)
3451 /* skip this conversion.
3452 * advance both strings to next white space
3457 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3458 /* '%*[' not yet supported, invalid format */
3463 while (!isspace(*str) && *str)
3468 /* get field width */
3470 if (isdigit(*fmt)) {
3471 field_width = skip_atoi(&fmt);
3472 if (field_width <= 0)
3476 /* get conversion qualifier */
3478 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
3481 if (unlikely(qualifier == *fmt)) {
3482 if (qualifier == 'h') {
3485 } else if (qualifier == 'l') {
3496 /* return number of characters read so far */
3497 *va_arg(args, int *) = str - buf;
3511 char *s = (char *)va_arg(args, char*);
3512 if (field_width == -1)
3516 } while (--field_width > 0 && *str);
3522 char *s = (char *)va_arg(args, char *);
3523 if (field_width == -1)
3524 field_width = SHRT_MAX;
3525 /* first, skip leading white space in buffer */
3526 str = skip_spaces(str);
3528 /* now copy until next white space */
3529 while (*str && !isspace(*str) && field_width--)
3536 * Warning: This implementation of the '[' conversion specifier
3537 * deviates from its glibc counterpart in the following ways:
3538 * (1) It does NOT support ranges i.e. '-' is NOT a special
3540 * (2) It cannot match the closing bracket ']' itself
3541 * (3) A field width is required
3542 * (4) '%*[' (discard matching input) is currently not supported
3545 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3546 * buf1, buf2, buf3);
3552 char *s = (char *)va_arg(args, char *);
3553 DECLARE_BITMAP(set, 256) = {0};
3554 unsigned int len = 0;
3555 bool negate = (*fmt == '^');
3557 /* field width is required */
3558 if (field_width == -1)
3564 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3565 __set_bit((u8)*fmt, set);
3567 /* no ']' or no character set found */
3573 bitmap_complement(set, set, 256);
3574 /* exclude null '\0' byte */
3575 __clear_bit(0, set);
3578 /* match must be non-empty */
3579 if (!test_bit((u8)*str, set))
3582 while (test_bit((u8)*str, set) && field_width--)
3604 /* looking for '%' in str */
3609 /* invalid format; stop here */
3613 /* have some sort of integer conversion.
3614 * first, skip white space in buffer.
3616 str = skip_spaces(str);
3619 if (is_sign && digit == '-') {
3620 if (field_width == 1)
3627 || (base == 16 && !isxdigit(digit))
3628 || (base == 10 && !isdigit(digit))
3629 || (base == 8 && (!isdigit(digit) || digit > '7'))
3630 || (base == 0 && !isdigit(digit)))
3634 val.s = simple_strntoll(str,
3635 field_width >= 0 ? field_width : INT_MAX,
3638 val.u = simple_strntoull(str,
3639 field_width >= 0 ? field_width : INT_MAX,
3642 switch (qualifier) {
3643 case 'H': /* that's 'hh' in format */
3645 *va_arg(args, signed char *) = val.s;
3647 *va_arg(args, unsigned char *) = val.u;
3651 *va_arg(args, short *) = val.s;
3653 *va_arg(args, unsigned short *) = val.u;
3657 *va_arg(args, long *) = val.s;
3659 *va_arg(args, unsigned long *) = val.u;
3663 *va_arg(args, long long *) = val.s;
3665 *va_arg(args, unsigned long long *) = val.u;
3668 *va_arg(args, size_t *) = val.u;
3672 *va_arg(args, int *) = val.s;
3674 *va_arg(args, unsigned int *) = val.u;
3686 EXPORT_SYMBOL(vsscanf);
3689 * sscanf - Unformat a buffer into a list of arguments
3690 * @buf: input buffer
3691 * @fmt: formatting of buffer
3692 * @...: resulting arguments
3694 int sscanf(const char *buf, const char *fmt, ...)
3699 va_start(args, fmt);
3700 i = vsscanf(buf, fmt, args);
3705 EXPORT_SYMBOL(sscanf);