vsprintf.c 66.6 KB
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/*
 *  linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
 * Wirzenius wrote this portably, Torvalds fucked it up :-)
 */

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/*
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 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
 * - changed to provide snprintf and vsnprintf functions
 * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
 * - scnprintf and vscnprintf
 */

#include <stdarg.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/module.h>	/* for KSYM_SYMBOL_LEN */
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#include <linux/types.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/kernel.h>
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#include <linux/kallsyms.h>
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#include <linux/math64.h>
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#include <linux/uaccess.h>
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#include <linux/ioport.h>
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#include <linux/dcache.h>
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#include <linux/cred.h>
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#include <linux/uuid.h>
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#include <net/addrconf.h>
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#ifdef CONFIG_BLOCK
#include <linux/blkdev.h>
#endif
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#include "../mm/internal.h"	/* For the trace_print_flags arrays */

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#include <asm/page.h>		/* for PAGE_SIZE */
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#include <asm/sections.h>	/* for dereference_function_descriptor() */
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#include <asm/byteorder.h>	/* cpu_to_le16 */
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#include <linux/string_helpers.h>
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#include "kstrtox.h"
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/**
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 * simple_strtoull - convert a string to an unsigned long long
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 * @cp: The start of the string
 * @endp: A pointer to the end of the parsed string will be placed here
 * @base: The number base to use
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 *
 * This function is obsolete. Please use kstrtoull instead.
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 */
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unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
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{
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	unsigned long long result;
	unsigned int rv;
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	cp = _parse_integer_fixup_radix(cp, &base);
	rv = _parse_integer(cp, base, &result);
	/* FIXME */
	cp += (rv & ~KSTRTOX_OVERFLOW);
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	if (endp)
		*endp = (char *)cp;
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	return result;
}
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EXPORT_SYMBOL(simple_strtoull);
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/**
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 * simple_strtoul - convert a string to an unsigned long
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 * @cp: The start of the string
 * @endp: A pointer to the end of the parsed string will be placed here
 * @base: The number base to use
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 *
 * This function is obsolete. Please use kstrtoul instead.
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 */
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unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
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{
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	return simple_strtoull(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtoul);
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/**
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 * simple_strtol - convert a string to a signed long
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 * @cp: The start of the string
 * @endp: A pointer to the end of the parsed string will be placed here
 * @base: The number base to use
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 *
 * This function is obsolete. Please use kstrtol instead.
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 */
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long simple_strtol(const char *cp, char **endp, unsigned int base)
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{
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	if (*cp == '-')
		return -simple_strtoul(cp + 1, endp, base);
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	return simple_strtoul(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtol);
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/**
 * simple_strtoll - convert a string to a signed long long
 * @cp: The start of the string
 * @endp: A pointer to the end of the parsed string will be placed here
 * @base: The number base to use
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 *
 * This function is obsolete. Please use kstrtoll instead.
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 */
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long long simple_strtoll(const char *cp, char **endp, unsigned int base)
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{
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	if (*cp == '-')
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		return -simple_strtoull(cp + 1, endp, base);
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	return simple_strtoull(cp, endp, base);
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}
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EXPORT_SYMBOL(simple_strtoll);
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static noinline_for_stack
int skip_atoi(const char **s)
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{
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	int i = 0;
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	do {
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		i = i*10 + *((*s)++) - '0';
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	} while (isdigit(**s));
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	return i;
}

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/*
 * Decimal conversion is by far the most typical, and is used for
 * /proc and /sys data. This directly impacts e.g. top performance
 * with many processes running. We optimize it for speed by emitting
 * two characters at a time, using a 200 byte lookup table. This
 * roughly halves the number of multiplications compared to computing
 * the digits one at a time. Implementation strongly inspired by the
 * previous version, which in turn used ideas described at
 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
 * from the author, Douglas W. Jones).
 *
 * It turns out there is precisely one 26 bit fixed-point
 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
 * range happens to be somewhat larger (x <= 1073741898), but that's
 * irrelevant for our purpose.
 *
 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
 * need a 32x32->64 bit multiply, so we simply use the same constant.
 *
 * For dividing a number in the range [100, 10^4-1] by 100, there are
 * several options. The simplest is (x * 0x147b) >> 19, which is valid
 * for all x <= 43698.
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 */
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static const u16 decpair[100] = {
#define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
	_( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
	_(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
	_(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
	_(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
	_(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
	_(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
	_(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
	_(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
	_(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
	_(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
#undef _
};

/*
 * This will print a single '0' even if r == 0, since we would
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 * immediately jump to out_r where two 0s would be written but only
 * one of them accounted for in buf. This is needed by ip4_string
 * below. All other callers pass a non-zero value of r.
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*/
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static noinline_for_stack
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char *put_dec_trunc8(char *buf, unsigned r)
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{
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	unsigned q;

	/* 1 <= r < 10^8 */
	if (r < 100)
		goto out_r;

	/* 100 <= r < 10^8 */
	q = (r * (u64)0x28f5c29) >> 32;
	*((u16 *)buf) = decpair[r - 100*q];
	buf += 2;

	/* 1 <= q < 10^6 */
	if (q < 100)
		goto out_q;

	/*  100 <= q < 10^6 */
	r = (q * (u64)0x28f5c29) >> 32;
	*((u16 *)buf) = decpair[q - 100*r];
	buf += 2;

	/* 1 <= r < 10^4 */
	if (r < 100)
		goto out_r;

	/* 100 <= r < 10^4 */
	q = (r * 0x147b) >> 19;
	*((u16 *)buf) = decpair[r - 100*q];
	buf += 2;
out_q:
	/* 1 <= q < 100 */
	r = q;
out_r:
	/* 1 <= r < 100 */
	*((u16 *)buf) = decpair[r];
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	buf += r < 10 ? 1 : 2;
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	return buf;
}
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#if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
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static noinline_for_stack
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char *put_dec_full8(char *buf, unsigned r)
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{
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	unsigned q;

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	/* 0 <= r < 10^8 */
	q = (r * (u64)0x28f5c29) >> 32;
	*((u16 *)buf) = decpair[r - 100*q];
	buf += 2;
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	/* 0 <= q < 10^6 */
	r = (q * (u64)0x28f5c29) >> 32;
	*((u16 *)buf) = decpair[q - 100*r];
	buf += 2;
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	/* 0 <= r < 10^4 */
	q = (r * 0x147b) >> 19;
	*((u16 *)buf) = decpair[r - 100*q];
	buf += 2;
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	/* 0 <= q < 100 */
	*((u16 *)buf) = decpair[q];
	buf += 2;
	return buf;
}
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static noinline_for_stack
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char *put_dec(char *buf, unsigned long long n)
{
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	if (n >= 100*1000*1000)
		buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
	/* 1 <= n <= 1.6e11 */
	if (n >= 100*1000*1000)
		buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
	/* 1 <= n < 1e8 */
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	return put_dec_trunc8(buf, n);
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}
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#elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
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static void
put_dec_full4(char *buf, unsigned r)
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{
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	unsigned q;

	/* 0 <= r < 10^4 */
	q = (r * 0x147b) >> 19;
	*((u16 *)buf) = decpair[r - 100*q];
	buf += 2;
	/* 0 <= q < 100 */
	*((u16 *)buf) = decpair[q];
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}

/*
 * Call put_dec_full4 on x % 10000, return x / 10000.
 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
 * holds for all x < 1,128,869,999.  The largest value this
 * helper will ever be asked to convert is 1,125,520,955.
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 * (second call in the put_dec code, assuming n is all-ones).
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 */
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static noinline_for_stack
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unsigned put_dec_helper4(char *buf, unsigned x)
{
        uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;

        put_dec_full4(buf, x - q * 10000);
        return q;
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}

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/* Based on code by Douglas W. Jones found at
 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
 * (with permission from the author).
 * Performs no 64-bit division and hence should be fast on 32-bit machines.
 */
static
char *put_dec(char *buf, unsigned long long n)
{
	uint32_t d3, d2, d1, q, h;

	if (n < 100*1000*1000)
		return put_dec_trunc8(buf, n);

	d1  = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
	h   = (n >> 32);
	d2  = (h      ) & 0xffff;
	d3  = (h >> 16); /* implicit "& 0xffff" */

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	/* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
	     = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
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	q   = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
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	q = put_dec_helper4(buf, q);

	q += 7671 * d3 + 9496 * d2 + 6 * d1;
	q = put_dec_helper4(buf+4, q);

	q += 4749 * d3 + 42 * d2;
	q = put_dec_helper4(buf+8, q);
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	q += 281 * d3;
	buf += 12;
	if (q)
		buf = put_dec_trunc8(buf, q);
	else while (buf[-1] == '0')
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		--buf;

	return buf;
}

#endif

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/*
 * Convert passed number to decimal string.
 * Returns the length of string.  On buffer overflow, returns 0.
 *
 * If speed is not important, use snprintf(). It's easy to read the code.
 */
int num_to_str(char *buf, int size, unsigned long long num)
{
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	/* put_dec requires 2-byte alignment of the buffer. */
	char tmp[sizeof(num) * 3] __aligned(2);
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	int idx, len;

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	/* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
	if (num <= 9) {
		tmp[0] = '0' + num;
		len = 1;
	} else {
		len = put_dec(tmp, num) - tmp;
	}
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	if (len > size)
		return 0;
	for (idx = 0; idx < len; ++idx)
		buf[idx] = tmp[len - idx - 1];
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	return len;
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}

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#define SIGN	1		/* unsigned/signed, must be 1 */
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#define LEFT	2		/* left justified */
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#define PLUS	4		/* show plus */
#define SPACE	8		/* space if plus */
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#define ZEROPAD	16		/* pad with zero, must be 16 == '0' - ' ' */
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#define SMALL	32		/* use lowercase in hex (must be 32 == 0x20) */
#define SPECIAL	64		/* prefix hex with "0x", octal with "0" */
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enum format_type {
	FORMAT_TYPE_NONE, /* Just a string part */
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	FORMAT_TYPE_WIDTH,
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	FORMAT_TYPE_PRECISION,
	FORMAT_TYPE_CHAR,
	FORMAT_TYPE_STR,
	FORMAT_TYPE_PTR,
	FORMAT_TYPE_PERCENT_CHAR,
	FORMAT_TYPE_INVALID,
	FORMAT_TYPE_LONG_LONG,
	FORMAT_TYPE_ULONG,
	FORMAT_TYPE_LONG,
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	FORMAT_TYPE_UBYTE,
	FORMAT_TYPE_BYTE,
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	FORMAT_TYPE_USHORT,
	FORMAT_TYPE_SHORT,
	FORMAT_TYPE_UINT,
	FORMAT_TYPE_INT,
	FORMAT_TYPE_SIZE_T,
	FORMAT_TYPE_PTRDIFF
};

struct printf_spec {
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	unsigned int	type:8;		/* format_type enum */
	signed int	field_width:24;	/* width of output field */
	unsigned int	flags:8;	/* flags to number() */
	unsigned int	base:8;		/* number base, 8, 10 or 16 only */
	signed int	precision:16;	/* # of digits/chars */
} __packed;
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#define FIELD_WIDTH_MAX ((1 << 23) - 1)
#define PRECISION_MAX ((1 << 15) - 1)
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static noinline_for_stack
char *number(char *buf, char *end, unsigned long long num,
	     struct printf_spec spec)
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{
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	/* put_dec requires 2-byte alignment of the buffer. */
	char tmp[3 * sizeof(num)] __aligned(2);
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	char sign;
	char locase;
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	int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
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	int i;
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	bool is_zero = num == 0LL;
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	int field_width = spec.field_width;
	int precision = spec.precision;
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	BUILD_BUG_ON(sizeof(struct printf_spec) != 8);

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	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
	 * produces same digits or (maybe lowercased) letters */
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	locase = (spec.flags & SMALL);
	if (spec.flags & LEFT)
		spec.flags &= ~ZEROPAD;
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	sign = 0;
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	if (spec.flags & SIGN) {
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		if ((signed long long)num < 0) {
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			sign = '-';
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			num = -(signed long long)num;
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			field_width--;
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		} else if (spec.flags & PLUS) {
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			sign = '+';
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			field_width--;
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		} else if (spec.flags & SPACE) {
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			sign = ' ';
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			field_width--;
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		}
	}
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	if (need_pfx) {
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		if (spec.base == 16)
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			field_width -= 2;
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		else if (!is_zero)
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			field_width--;
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	}
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	/* generate full string in tmp[], in reverse order */
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	i = 0;
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	if (num < spec.base)
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		tmp[i++] = hex_asc_upper[num] | locase;
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	else if (spec.base != 10) { /* 8 or 16 */
		int mask = spec.base - 1;
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		int shift = 3;
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		if (spec.base == 16)
			shift = 4;
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		do {
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			tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
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			num >>= shift;
		} while (num);
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	} else { /* base 10 */
		i = put_dec(tmp, num) - tmp;
	}
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	/* printing 100 using %2d gives "100", not "00" */
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	if (i > precision)
		precision = i;
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	/* leading space padding */
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	field_width -= precision;
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	if (!(spec.flags & (ZEROPAD | LEFT))) {
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		while (--field_width >= 0) {
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			if (buf < end)
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				*buf = ' ';
			++buf;
		}
	}
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	/* sign */
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	if (sign) {
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		if (buf < end)
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			*buf = sign;
		++buf;
	}
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	/* "0x" / "0" prefix */
	if (need_pfx) {
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		if (spec.base == 16 || !is_zero) {
			if (buf < end)
				*buf = '0';
			++buf;
		}
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		if (spec.base == 16) {
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			if (buf < end)
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				*buf = ('X' | locase);
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			++buf;
		}
	}
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	/* zero or space padding */
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	if (!(spec.flags & LEFT)) {
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		char c = ' ' + (spec.flags & ZEROPAD);
		BUILD_BUG_ON(' ' + ZEROPAD != '0');
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		while (--field_width >= 0) {
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			if (buf < end)
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				*buf = c;
			++buf;
		}
	}
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	/* hmm even more zero padding? */
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	while (i <= --precision) {
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		if (buf < end)
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			*buf = '0';
		++buf;
	}
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	/* actual digits of result */
	while (--i >= 0) {
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		if (buf < end)
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			*buf = tmp[i];
		++buf;
	}
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	/* trailing space padding */
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	while (--field_width >= 0) {
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		if (buf < end)
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			*buf = ' ';
		++buf;
	}
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	return buf;
}

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static noinline_for_stack
char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
{
	struct printf_spec spec;

	spec.type = FORMAT_TYPE_PTR;
	spec.field_width = 2 + 2 * size;	/* 0x + hex */
	spec.flags = SPECIAL | SMALL | ZEROPAD;
	spec.base = 16;
	spec.precision = -1;

	return number(buf, end, num, spec);
}

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static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
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{
	size_t size;
	if (buf >= end)	/* nowhere to put anything */
		return;
	size = end - buf;
	if (size <= spaces) {
		memset(buf, ' ', size);
		return;
	}
	if (len) {
		if (len > size - spaces)
			len = size - spaces;
		memmove(buf + spaces, buf, len);
	}
	memset(buf, ' ', spaces);
}

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/*
 * Handle field width padding for a string.
 * @buf: current buffer position
 * @n: length of string
 * @end: end of output buffer
 * @spec: for field width and flags
 * Returns: new buffer position after padding.
 */
static noinline_for_stack
char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
{
	unsigned spaces;

	if (likely(n >= spec.field_width))
		return buf;
	/* we want to pad the sucker */
	spaces = spec.field_width - n;
	if (!(spec.flags & LEFT)) {
		move_right(buf - n, end, n, spaces);
		return buf + spaces;
	}
	while (spaces--) {
		if (buf < end)
			*buf = ' ';
		++buf;
	}
	return buf;
}

582 583 584
static noinline_for_stack
char *string(char *buf, char *end, const char *s, struct printf_spec spec)
{
585 586
	int len = 0;
	size_t lim = spec.precision;
587 588 589 590

	if ((unsigned long)s < PAGE_SIZE)
		s = "(null)";

591 592 593 594
	while (lim--) {
		char c = *s++;
		if (!c)
			break;
595
		if (buf < end)
596
			*buf = c;
597
		++buf;
598
		++len;
599
	}
600
	return widen_string(buf, len, end, spec);
601 602
}

603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
static noinline_for_stack
char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
		  const char *fmt)
{
	const char *array[4], *s;
	const struct dentry *p;
	int depth;
	int i, n;

	switch (fmt[1]) {
		case '2': case '3': case '4':
			depth = fmt[1] - '0';
			break;
		default:
			depth = 1;
	}

	rcu_read_lock();
	for (i = 0; i < depth; i++, d = p) {
		p = ACCESS_ONCE(d->d_parent);
		array[i] = ACCESS_ONCE(d->d_name.name);
		if (p == d) {
			if (i)
				array[i] = "";
			i++;
			break;
		}
	}
	s = array[--i];
	for (n = 0; n != spec.precision; n++, buf++) {
		char c = *s++;
		if (!c) {
			if (!i)
				break;
			c = '/';
			s = array[--i];
		}
		if (buf < end)
			*buf = c;
	}
	rcu_read_unlock();
644
	return widen_string(buf, n, end, spec);
645 646
}

647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
#ifdef CONFIG_BLOCK
static noinline_for_stack
char *bdev_name(char *buf, char *end, struct block_device *bdev,
		struct printf_spec spec, const char *fmt)
{
	struct gendisk *hd = bdev->bd_disk;
	
	buf = string(buf, end, hd->disk_name, spec);
	if (bdev->bd_part->partno) {
		if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
			if (buf < end)
				*buf = 'p';
			buf++;
		}
		buf = number(buf, end, bdev->bd_part->partno, spec);
	}
	return buf;
}
#endif

667 668
static noinline_for_stack
char *symbol_string(char *buf, char *end, void *ptr,
669
		    struct printf_spec spec, const char *fmt)
670
{
671
	unsigned long value;
672 673
#ifdef CONFIG_KALLSYMS
	char sym[KSYM_SYMBOL_LEN];
674 675 676 677 678 679 680 681
#endif

	if (fmt[1] == 'R')
		ptr = __builtin_extract_return_addr(ptr);
	value = (unsigned long)ptr;

#ifdef CONFIG_KALLSYMS
	if (*fmt == 'B')
682
		sprint_backtrace(sym, value);
683
	else if (*fmt != 'f' && *fmt != 's')
684 685
		sprint_symbol(sym, value);
	else
686
		sprint_symbol_no_offset(sym, value);
687

688
	return string(buf, end, sym, spec);
689
#else
690
	return special_hex_number(buf, end, value, sizeof(void *));
691 692 693
#endif
}

694 695 696
static noinline_for_stack
char *resource_string(char *buf, char *end, struct resource *res,
		      struct printf_spec spec, const char *fmt)
697 698
{
#ifndef IO_RSRC_PRINTK_SIZE
699
#define IO_RSRC_PRINTK_SIZE	6
700 701 702
#endif

#ifndef MEM_RSRC_PRINTK_SIZE
703
#define MEM_RSRC_PRINTK_SIZE	10
704
#endif
705
	static const struct printf_spec io_spec = {
706
		.base = 16,
707
		.field_width = IO_RSRC_PRINTK_SIZE,
708 709 710
		.precision = -1,
		.flags = SPECIAL | SMALL | ZEROPAD,
	};
711 712 713 714 715 716
	static const struct printf_spec mem_spec = {
		.base = 16,
		.field_width = MEM_RSRC_PRINTK_SIZE,
		.precision = -1,
		.flags = SPECIAL | SMALL | ZEROPAD,
	};
717 718 719 720 721 722
	static const struct printf_spec bus_spec = {
		.base = 16,
		.field_width = 2,
		.precision = -1,
		.flags = SMALL | ZEROPAD,
	};
723
	static const struct printf_spec dec_spec = {
724 725 726 727
		.base = 10,
		.precision = -1,
		.flags = 0,
	};
728
	static const struct printf_spec str_spec = {
729 730 731 732
		.field_width = -1,
		.precision = 10,
		.flags = LEFT,
	};
733
	static const struct printf_spec flag_spec = {
734 735 736 737
		.base = 16,
		.precision = -1,
		.flags = SPECIAL | SMALL,
	};
738 739 740 741 742

	/* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
	 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
#define RSRC_BUF_SIZE		((2 * sizeof(resource_size_t)) + 4)
#define FLAG_BUF_SIZE		(2 * sizeof(res->flags))
743
#define DECODED_BUF_SIZE	sizeof("[mem - 64bit pref window disabled]")
744 745 746 747
#define RAW_BUF_SIZE		sizeof("[mem - flags 0x]")
	char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
		     2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];

748
	char *p = sym, *pend = sym + sizeof(sym);
749
	int decode = (fmt[0] == 'R') ? 1 : 0;
750
	const struct printf_spec *specp;
751 752

	*p++ = '[';
753
	if (res->flags & IORESOURCE_IO) {
754
		p = string(p, pend, "io  ", str_spec);
755 756
		specp = &io_spec;
	} else if (res->flags & IORESOURCE_MEM) {
757
		p = string(p, pend, "mem ", str_spec);
758 759
		specp = &mem_spec;
	} else if (res->flags & IORESOURCE_IRQ) {
760
		p = string(p, pend, "irq ", str_spec);
761 762
		specp = &dec_spec;
	} else if (res->flags & IORESOURCE_DMA) {
763
		p = string(p, pend, "dma ", str_spec);
764
		specp = &dec_spec;
765 766 767
	} else if (res->flags & IORESOURCE_BUS) {
		p = string(p, pend, "bus ", str_spec);
		specp = &bus_spec;
768
	} else {
769
		p = string(p, pend, "??? ", str_spec);
770
		specp = &mem_spec;
771
		decode = 0;
772
	}
773 774 775 776 777 778 779 780 781
	if (decode && res->flags & IORESOURCE_UNSET) {
		p = string(p, pend, "size ", str_spec);
		p = number(p, pend, resource_size(res), *specp);
	} else {
		p = number(p, pend, res->start, *specp);
		if (res->start != res->end) {
			*p++ = '-';
			p = number(p, pend, res->end, *specp);
		}
782
	}
783
	if (decode) {
784 785 786 787
		if (res->flags & IORESOURCE_MEM_64)
			p = string(p, pend, " 64bit", str_spec);
		if (res->flags & IORESOURCE_PREFETCH)
			p = string(p, pend, " pref", str_spec);
788 789
		if (res->flags & IORESOURCE_WINDOW)
			p = string(p, pend, " window", str_spec);
790 791
		if (res->flags & IORESOURCE_DISABLED)
			p = string(p, pend, " disabled", str_spec);
792 793 794
	} else {
		p = string(p, pend, " flags ", str_spec);
		p = number(p, pend, res->flags, flag_spec);
795
	}
796
	*p++ = ']';
797
	*p = '\0';
798

799
	return string(buf, end, sym, spec);
800 801
}

802 803 804 805
static noinline_for_stack
char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
		 const char *fmt)
{
806
	int i, len = 1;		/* if we pass '%ph[CDN]', field width remains
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
				   negative value, fallback to the default */
	char separator;

	if (spec.field_width == 0)
		/* nothing to print */
		return buf;

	if (ZERO_OR_NULL_PTR(addr))
		/* NULL pointer */
		return string(buf, end, NULL, spec);

	switch (fmt[1]) {
	case 'C':
		separator = ':';
		break;
	case 'D':
		separator = '-';
		break;
	case 'N':
		separator = 0;
		break;
	default:
		separator = ' ';
		break;
	}

	if (spec.field_width > 0)
		len = min_t(int, spec.field_width, 64);

836 837 838 839 840 841 842
	for (i = 0; i < len; ++i) {
		if (buf < end)
			*buf = hex_asc_hi(addr[i]);
		++buf;
		if (buf < end)
			*buf = hex_asc_lo(addr[i]);
		++buf;
843

844 845 846 847 848
		if (separator && i != len - 1) {
			if (buf < end)
				*buf = separator;
			++buf;
		}
849 850 851 852 853
	}

	return buf;
}

854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
static noinline_for_stack
char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
		    struct printf_spec spec, const char *fmt)
{
	const int CHUNKSZ = 32;
	int nr_bits = max_t(int, spec.field_width, 0);
	int i, chunksz;
	bool first = true;

	/* reused to print numbers */
	spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };

	chunksz = nr_bits & (CHUNKSZ - 1);
	if (chunksz == 0)
		chunksz = CHUNKSZ;

	i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
	for (; i >= 0; i -= CHUNKSZ) {
		u32 chunkmask, val;
		int word, bit;

		chunkmask = ((1ULL << chunksz) - 1);
		word = i / BITS_PER_LONG;
		bit = i % BITS_PER_LONG;
		val = (bitmap[word] >> bit) & chunkmask;

		if (!first) {
			if (buf < end)
				*buf = ',';
			buf++;
		}
		first = false;

		spec.field_width = DIV_ROUND_UP(chunksz, 4);
		buf = number(buf, end, val, spec);

		chunksz = CHUNKSZ;
	}
	return buf;
}

static noinline_for_stack
char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
			 struct printf_spec spec, const char *fmt)
{
	int nr_bits = max_t(int, spec.field_width, 0);
	/* current bit is 'cur', most recently seen range is [rbot, rtop] */
	int cur, rbot, rtop;
	bool first = true;

	/* reused to print numbers */
	spec = (struct printf_spec){ .base = 10 };

	rbot = cur = find_first_bit(bitmap, nr_bits);
	while (cur < nr_bits) {
		rtop = cur;
		cur = find_next_bit(bitmap, nr_bits, cur + 1);
		if (cur < nr_bits && cur <= rtop + 1)
			continue;

		if (!first) {
			if (buf < end)
				*buf = ',';
			buf++;
		}
		first = false;

		buf = number(buf, end, rbot, spec);
		if (rbot < rtop) {
			if (buf < end)
				*buf = '-';
			buf++;

			buf = number(buf, end, rtop, spec);
		}

		rbot = cur;
	}
	return buf;
}

935 936 937
static noinline_for_stack
char *mac_address_string(char *buf, char *end, u8 *addr,
			 struct printf_spec spec, const char *fmt)
938
{
939
	char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
940 941
	char *p = mac_addr;
	int i;
942
	char separator;
943
	bool reversed = false;
944

945 946
	switch (fmt[1]) {
	case 'F':
947
		separator = '-';
948 949 950 951 952 953 954
		break;

	case 'R':
		reversed = true;
		/* fall through */

	default:
955
		separator = ':';
956
		break;
957
	}
958 959

	for (i = 0; i < 6; i++) {
960 961 962 963 964
		if (reversed)
			p = hex_byte_pack(p, addr[5 - i]);
		else
			p = hex_byte_pack(p, addr[i]);

965
		if (fmt[0] == 'M' && i != 5)
966
			*p++ = separator;
967 968 969
	}
	*p = '\0';

970
	return string(buf, end, mac_addr, spec);
971 972
}

973 974
static noinline_for_stack
char *ip4_string(char *p, const u8 *addr, const char *fmt)
975 976
{
	int i;
977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
	bool leading_zeros = (fmt[0] == 'i');
	int index;
	int step;

	switch (fmt[2]) {
	case 'h':
#ifdef __BIG_ENDIAN
		index = 0;
		step = 1;
#else
		index = 3;
		step = -1;
#endif
		break;
	case 'l':
		index = 3;
		step = -1;
		break;
	case 'n':
	case 'b':
	default:
		index = 0;
		step = 1;
		break;
	}
1002
	for (i = 0; i < 4; i++) {
1003
		char temp[4] __aligned(2);	/* hold each IP quad in reverse order */
1004
		int digits = put_dec_trunc8(temp, addr[index]) - temp;
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015
		if (leading_zeros) {
			if (digits < 3)
				*p++ = '0';
			if (digits < 2)
				*p++ = '0';
		}
		/* reverse the digits in the quad */
		while (digits--)
			*p++ = temp[digits];
		if (i < 3)
			*p++ = '.';
1016
		index += step;
1017 1018
	}
	*p = '\0';
1019

1020 1021 1022
	return p;
}

1023 1024
static noinline_for_stack
char *ip6_compressed_string(char *p, const char *addr)
1025
{
1026
	int i, j, range;
1027 1028 1029 1030
	unsigned char zerolength[8];
	int longest = 1;
	int colonpos = -1;
	u16 word;
1031
	u8 hi, lo;
1032
	bool needcolon = false;
1033 1034 1035 1036 1037 1038
	bool useIPv4;
	struct in6_addr in6;

	memcpy(&in6, addr, sizeof(struct in6_addr));

	useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049

	memset(zerolength, 0, sizeof(zerolength));

	if (useIPv4)
		range = 6;
	else
		range = 8;

	/* find position of longest 0 run */
	for (i = 0; i < range; i++) {
		for (j = i; j < range; j++) {
1050
			if (in6.s6_addr16[j] != 0)
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
				break;
			zerolength[i]++;
		}
	}
	for (i = 0; i < range; i++) {
		if (zerolength[i] > longest) {
			longest = zerolength[i];
			colonpos = i;
		}
	}
1061 1062
	if (longest == 1)		/* don't compress a single 0 */
		colonpos = -1;
1063

1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	/* emit address */
	for (i = 0; i < range; i++) {
		if (i == colonpos) {
			if (needcolon || i == 0)
				*p++ = ':';
			*p++ = ':';
			needcolon = false;
			i += longest - 1;
			continue;
		}
		if (needcolon) {
			*p++ = ':';
			needcolon = false;
		}
		/* hex u16 without leading 0s */
1079
		word = ntohs(in6.s6_addr16[i]);
1080 1081 1082 1083
		hi = word >> 8;
		lo = word & 0xff;
		if (hi) {
			if (hi > 0x0f)
1084
				p = hex_byte_pack(p, hi);
1085 1086
			else
				*p++ = hex_asc_lo(hi);
1087
			p = hex_byte_pack(p, lo);
1088
		}
1089
		else if (lo > 0x0f)
1090
			p = hex_byte_pack(p, lo);
1091 1092 1093 1094 1095 1096 1097 1098
		else
			*p++ = hex_asc_lo(lo);
		needcolon = true;
	}

	if (useIPv4) {
		if (needcolon)
			*p++ = ':';
1099
		p = ip4_string(p, &in6.s6_addr[12], "I4");
1100 1101
	}
	*p = '\0';
1102

1103 1104 1105
	return p;
}

1106 1107
static noinline_for_stack
char *ip6_string(char *p, const char *addr, const char *fmt)
1108 1109
{
	int i;
1110

1111
	for (i = 0; i < 8; i++) {
1112 1113
		p = hex_byte_pack(p, *addr++);
		p = hex_byte_pack(p, *addr++);
1114
		if (fmt[0] == 'I' && i != 7)
1115 1116 1117
			*p++ = ':';
	}
	*p = '\0';
1118

1119 1120 1121
	return p;
}

1122 1123 1124
static noinline_for_stack
char *ip6_addr_string(char *buf, char *end, const u8 *addr,
		      struct printf_spec spec, const char *fmt)
1125 1126 1127 1128
{
	char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];

	if (fmt[0] == 'I' && fmt[2] == 'c')
1129
		ip6_compressed_string(ip6_addr, addr);
1130
	else
1131
		ip6_string(ip6_addr, addr, fmt);
1132

1133
	return string(buf, end, ip6_addr, spec);
1134 1135
}

1136 1137 1138
static noinline_for_stack
char *ip4_addr_string(char *buf, char *end, const u8 *addr,
		      struct printf_spec spec, const char *fmt)
1139
{
1140
	char ip4_addr[sizeof("255.255.255.255")];
1141

1142
	ip4_string(ip4_addr, addr, fmt);
1143

1144
	return string(buf, end, ip4_addr, spec);
1145 1146
}

1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
static noinline_for_stack
char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
			 struct printf_spec spec, const char *fmt)
{
	bool have_p = false, have_s = false, have_f = false, have_c = false;
	char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
		      sizeof(":12345") + sizeof("/123456789") +
		      sizeof("%1234567890")];
	char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
	const u8 *addr = (const u8 *) &sa->sin6_addr;
	char fmt6[2] = { fmt[0], '6' };
	u8 off = 0;

	fmt++;
	while (isalpha(*++fmt)) {
		switch (*fmt) {
		case 'p':
			have_p = true;
			break;
		case 'f':
			have_f = true;
			break;
		case 's':
			have_s = true;
			break;
		case 'c':
			have_c = true;
			break;
		}
	}

	if (have_p || have_s || have_f) {
		*p = '[';
		off = 1;
	}

	if (fmt6[0] == 'I' && have_c)
		p = ip6_compressed_string(ip6_addr + off, addr);
	else
		p = ip6_string(ip6_addr + off, addr, fmt6);

	if (have_p || have_s || have_f)
		*p++ = ']';

	if (have_p) {
		*p++ = ':';
		p = number(p, pend, ntohs(sa->sin6_port), spec);
	}
	if (have_f) {
		*p++ = '/';
		p = number(p, pend, ntohl(sa->sin6_flowinfo &
					  IPV6_FLOWINFO_MASK), spec);
	}
	if (have_s) {
		*p++ = '%';
		p = number(p, pend, sa->sin6_scope_id, spec);
	}
	*p = '\0';

	return string(buf, end, ip6_addr, spec);
}

static noinline_for_stack
char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
			 struct printf_spec spec, const char *fmt)
{
	bool have_p = false;
	char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
	char *pend = ip4_addr + sizeof(ip4_addr);
	const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
	char fmt4[3] = { fmt[0], '4', 0 };

	fmt++;
	while (isalpha(*++fmt)) {
		switch (*fmt) {
		case 'p':
			have_p = true;
			break;
		case 'h':
		case 'l':
		case 'n':
		case 'b':
			fmt4[2] = *fmt;
			break;
		}
	}

	p = ip4_string(ip4_addr, addr, fmt4);
	if (have_p) {
		*p++ = ':';
		p = number(p, pend, ntohs(sa->sin_port), spec);
	}
	*p = '\0';

	return string(buf, end, ip4_addr, spec);
}

1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
static noinline_for_stack
char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
		     const char *fmt)
{
	bool found = true;
	int count = 1;
	unsigned int flags = 0;
	int len;

	if (spec.field_width == 0)
		return buf;				/* nothing to print */

	if (ZERO_OR_NULL_PTR(addr))
		return string(buf, end, NULL, spec);	/* NULL pointer */


	do {
		switch (fmt[count++]) {
		case 'a':
			flags |= ESCAPE_ANY;
			break;
		case 'c':
			flags |= ESCAPE_SPECIAL;
			break;
		case 'h':
			flags |= ESCAPE_HEX;
			break;
		case 'n':
			flags |= ESCAPE_NULL;
			break;
		case 'o':
			flags |= ESCAPE_OCTAL;
			break;
		case 'p':
			flags |= ESCAPE_NP;
			break;
		case 's':
			flags |= ESCAPE_SPACE;
			break;
		default:
			found = false;
			break;
		}
	} while (found);

	if (!flags)
		flags = ESCAPE_ANY_NP;

	len = spec.field_width < 0 ? 1 : spec.field_width;

1294 1295 1296 1297 1298 1299
	/*
	 * string_escape_mem() writes as many characters as it can to
	 * the given buffer, and returns the total size of the output
	 * had the buffer been big enough.
	 */
	buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1300 1301 1302 1303

	return buf;
}

1304 1305 1306
static noinline_for_stack
char *uuid_string(char *buf, char *end, const u8 *addr,
		  struct printf_spec spec, const char *fmt)
1307
{
1308
	char uuid[UUID_STRING_LEN + 1];
1309 1310
	char *p = uuid;
	int i;
1311
	const u8 *index = uuid_be_index;
1312 1313 1314 1315 1316 1317
	bool uc = false;

	switch (*(++fmt)) {
	case 'L':
		uc = true;		/* fall-through */
	case 'l':
1318
		index = uuid_le_index;
1319 1320 1321 1322 1323 1324 1325
		break;
	case 'B':
		uc = true;
		break;
	}

	for (i = 0; i < 16; i++) {
1326 1327 1328 1329
		if (uc)
			p = hex_byte_pack_upper(p, addr[index[i]]);
		else
			p = hex_byte_pack(p, addr[index[i]]);
1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
		switch (i) {
		case 3:
		case 5:
		case 7:
		case 9:
			*p++ = '-';
			break;
		}
	}

	*p = 0;

	return string(buf, end, uuid, spec);
}

1345 1346
static noinline_for_stack
char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt)
1347
{
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
	unsigned long long num;
	int size;

	switch (fmt[1]) {
	case 'F':
		num = *(const netdev_features_t *)addr;
		size = sizeof(netdev_features_t);
		break;
	default:
		num = (unsigned long)addr;
		size = sizeof(unsigned long);
		break;
	}
1361

1362
	return special_hex_number(buf, end, num, size);
1363 1364
}

1365
static noinline_for_stack
1366
char *address_val(char *buf, char *end, const void *addr, const char *fmt)
1367 1368
{
	unsigned long long num;
1369
	int size;
1370 1371 1372 1373

	switch (fmt[1]) {
	case 'd':
		num = *(const dma_addr_t *)addr;
1374
		size = sizeof(dma_addr_t);
1375 1376 1377 1378
		break;
	case 'p':
	default:
		num = *(const phys_addr_t *)addr;
1379
		size = sizeof(phys_addr_t);
1380 1381 1382
		break;
	}

1383
	return special_hex_number(buf, end, num, size);
1384 1385
}

1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
static noinline_for_stack
char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
	    const char *fmt)
{
	if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
		return string(buf, end, NULL, spec);

	switch (fmt[1]) {
	case 'n':
	default:
#ifdef CONFIG_COMMON_CLK
		return string(buf, end, __clk_get_name(clk), spec);
#else
1399
		return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long));
1400 1401 1402 1403
#endif
	}
}

1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
static
char *format_flags(char *buf, char *end, unsigned long flags,
					const struct trace_print_flags *names)
{
	unsigned long mask;
	const struct printf_spec strspec = {
		.field_width = -1,
		.precision = -1,
	};
	const struct printf_spec numspec = {
		.flags = SPECIAL|SMALL,
		.field_width = -1,
		.precision = -1,
		.base = 16,
	};

	for ( ; flags && names->name; names++) {
		mask = names->mask;
		if ((flags & mask) != mask)
			continue;

		buf = string(buf, end, names->name, strspec);

		flags &= ~mask;
		if (flags) {
			if (buf < end)
				*buf = '|';
			buf++;
		}
	}

	if (flags)
		buf = number(buf, end, flags, numspec);

	return buf;
}

static noinline_for_stack
char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
{
	unsigned long flags;
	const struct trace_print_flags *names;

	switch (fmt[1]) {
	case 'p':
		flags = *(unsigned long *)flags_ptr;
		/* Remove zone id */
		flags &= (1UL << NR_PAGEFLAGS) - 1;
		names = pageflag_names;
		break;
	case 'v':
		flags = *(unsigned long *)flags_ptr;
		names = vmaflag_names;
		break;
	case 'g':
		flags = *(gfp_t *)flags_ptr;
		names = gfpflag_names;
		break;
	default:
		WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]);
		return buf;
	}

	return format_flags(buf, end, flags, names);
}

1470
int kptr_restrict __read_mostly;
1471

1472 1473 1474 1475 1476
/*
 * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 * by an extra set of alphanumeric characters that are extended format
 * specifiers.
 *
1477 1478
 * Right now we handle:
 *
1479 1480
 * - 'F' For symbolic function descriptor pointers with offset
 * - 'f' For simple symbolic function names without offset
1481 1482
 * - 'S' For symbolic direct pointers with offset
 * - 's' For symbolic direct pointers without offset
1483
 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1484
 * - 'B' For backtraced symbolic direct pointers with offset
1485 1486
 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1487 1488 1489 1490
 * - 'b[l]' For a bitmap, the number of bits is determined by the field
 *       width which must be explicitly specified either as part of the
 *       format string '%32b[l]' or through '%*b[l]', [l] selects
 *       range-list format instead of hex format
1491 1492
 * - 'M' For a 6-byte MAC address, it prints the address in the
 *       usual colon-separated hex notation
1493
 * - 'm' For a 6-byte MAC address, it prints the hex address without colons