mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Vladimir Kondratiev](/assets/img/avatar_default.png)
Introduce print_hex_dump_debug() that can be dynamically controlled, similar to pr_debug. Also, make print_hex_dump_bytes() dynamically controlled Implement only 'p' flag (_DPRINTK_FLAGS_PRINT) to keep it simple since hex dump prints multiple lines and long prefix would impact readability. To provide line/file etc. information, use pr_debug or similar before/after print_hex_dump_debug() Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
251 lines
7.1 KiB
C
251 lines
7.1 KiB
C
/*
|
|
* lib/hexdump.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation. See README and COPYING for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
|
|
const char hex_asc[] = "0123456789abcdef";
|
|
EXPORT_SYMBOL(hex_asc);
|
|
|
|
/**
|
|
* hex_to_bin - convert a hex digit to its real value
|
|
* @ch: ascii character represents hex digit
|
|
*
|
|
* hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
|
|
* input.
|
|
*/
|
|
int hex_to_bin(char ch)
|
|
{
|
|
if ((ch >= '0') && (ch <= '9'))
|
|
return ch - '0';
|
|
ch = tolower(ch);
|
|
if ((ch >= 'a') && (ch <= 'f'))
|
|
return ch - 'a' + 10;
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(hex_to_bin);
|
|
|
|
/**
|
|
* hex2bin - convert an ascii hexadecimal string to its binary representation
|
|
* @dst: binary result
|
|
* @src: ascii hexadecimal string
|
|
* @count: result length
|
|
*
|
|
* Return 0 on success, -1 in case of bad input.
|
|
*/
|
|
int hex2bin(u8 *dst, const char *src, size_t count)
|
|
{
|
|
while (count--) {
|
|
int hi = hex_to_bin(*src++);
|
|
int lo = hex_to_bin(*src++);
|
|
|
|
if ((hi < 0) || (lo < 0))
|
|
return -1;
|
|
|
|
*dst++ = (hi << 4) | lo;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(hex2bin);
|
|
|
|
/**
|
|
* hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
|
|
* @buf: data blob to dump
|
|
* @len: number of bytes in the @buf
|
|
* @rowsize: number of bytes to print per line; must be 16 or 32
|
|
* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
|
|
* @linebuf: where to put the converted data
|
|
* @linebuflen: total size of @linebuf, including space for terminating NUL
|
|
* @ascii: include ASCII after the hex output
|
|
*
|
|
* hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
|
|
* 16 or 32 bytes of input data converted to hex + ASCII output.
|
|
*
|
|
* Given a buffer of u8 data, hex_dump_to_buffer() converts the input data
|
|
* to a hex + ASCII dump at the supplied memory location.
|
|
* The converted output is always NUL-terminated.
|
|
*
|
|
* E.g.:
|
|
* hex_dump_to_buffer(frame->data, frame->len, 16, 1,
|
|
* linebuf, sizeof(linebuf), true);
|
|
*
|
|
* example output buffer:
|
|
* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
|
|
*/
|
|
void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
|
|
int groupsize, char *linebuf, size_t linebuflen,
|
|
bool ascii)
|
|
{
|
|
const u8 *ptr = buf;
|
|
u8 ch;
|
|
int j, lx = 0;
|
|
int ascii_column;
|
|
|
|
if (rowsize != 16 && rowsize != 32)
|
|
rowsize = 16;
|
|
|
|
if (!len)
|
|
goto nil;
|
|
if (len > rowsize) /* limit to one line at a time */
|
|
len = rowsize;
|
|
if ((len % groupsize) != 0) /* no mixed size output */
|
|
groupsize = 1;
|
|
|
|
switch (groupsize) {
|
|
case 8: {
|
|
const u64 *ptr8 = buf;
|
|
int ngroups = len / groupsize;
|
|
|
|
for (j = 0; j < ngroups; j++)
|
|
lx += scnprintf(linebuf + lx, linebuflen - lx,
|
|
"%s%16.16llx", j ? " " : "",
|
|
(unsigned long long)*(ptr8 + j));
|
|
ascii_column = 17 * ngroups + 2;
|
|
break;
|
|
}
|
|
|
|
case 4: {
|
|
const u32 *ptr4 = buf;
|
|
int ngroups = len / groupsize;
|
|
|
|
for (j = 0; j < ngroups; j++)
|
|
lx += scnprintf(linebuf + lx, linebuflen - lx,
|
|
"%s%8.8x", j ? " " : "", *(ptr4 + j));
|
|
ascii_column = 9 * ngroups + 2;
|
|
break;
|
|
}
|
|
|
|
case 2: {
|
|
const u16 *ptr2 = buf;
|
|
int ngroups = len / groupsize;
|
|
|
|
for (j = 0; j < ngroups; j++)
|
|
lx += scnprintf(linebuf + lx, linebuflen - lx,
|
|
"%s%4.4x", j ? " " : "", *(ptr2 + j));
|
|
ascii_column = 5 * ngroups + 2;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
for (j = 0; (j < len) && (lx + 3) <= linebuflen; j++) {
|
|
ch = ptr[j];
|
|
linebuf[lx++] = hex_asc_hi(ch);
|
|
linebuf[lx++] = hex_asc_lo(ch);
|
|
linebuf[lx++] = ' ';
|
|
}
|
|
if (j)
|
|
lx--;
|
|
|
|
ascii_column = 3 * rowsize + 2;
|
|
break;
|
|
}
|
|
if (!ascii)
|
|
goto nil;
|
|
|
|
while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
|
|
linebuf[lx++] = ' ';
|
|
for (j = 0; (j < len) && (lx + 2) < linebuflen; j++) {
|
|
ch = ptr[j];
|
|
linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
|
|
}
|
|
nil:
|
|
linebuf[lx++] = '\0';
|
|
}
|
|
EXPORT_SYMBOL(hex_dump_to_buffer);
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
/**
|
|
* print_hex_dump - print a text hex dump to syslog for a binary blob of data
|
|
* @level: kernel log level (e.g. KERN_DEBUG)
|
|
* @prefix_str: string to prefix each line with;
|
|
* caller supplies trailing spaces for alignment if desired
|
|
* @prefix_type: controls whether prefix of an offset, address, or none
|
|
* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
|
|
* @rowsize: number of bytes to print per line; must be 16 or 32
|
|
* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
|
|
* @buf: data blob to dump
|
|
* @len: number of bytes in the @buf
|
|
* @ascii: include ASCII after the hex output
|
|
*
|
|
* Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump
|
|
* to the kernel log at the specified kernel log level, with an optional
|
|
* leading prefix.
|
|
*
|
|
* print_hex_dump() works on one "line" of output at a time, i.e.,
|
|
* 16 or 32 bytes of input data converted to hex + ASCII output.
|
|
* print_hex_dump() iterates over the entire input @buf, breaking it into
|
|
* "line size" chunks to format and print.
|
|
*
|
|
* E.g.:
|
|
* print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
|
|
* 16, 1, frame->data, frame->len, true);
|
|
*
|
|
* Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
|
|
* 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
|
|
* Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
|
|
* ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~.
|
|
*/
|
|
void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
|
|
int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii)
|
|
{
|
|
const u8 *ptr = buf;
|
|
int i, linelen, remaining = len;
|
|
unsigned char linebuf[32 * 3 + 2 + 32 + 1];
|
|
|
|
if (rowsize != 16 && rowsize != 32)
|
|
rowsize = 16;
|
|
|
|
for (i = 0; i < len; i += rowsize) {
|
|
linelen = min(remaining, rowsize);
|
|
remaining -= rowsize;
|
|
|
|
hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
|
|
linebuf, sizeof(linebuf), ascii);
|
|
|
|
switch (prefix_type) {
|
|
case DUMP_PREFIX_ADDRESS:
|
|
printk("%s%s%p: %s\n",
|
|
level, prefix_str, ptr + i, linebuf);
|
|
break;
|
|
case DUMP_PREFIX_OFFSET:
|
|
printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
|
|
break;
|
|
default:
|
|
printk("%s%s%s\n", level, prefix_str, linebuf);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(print_hex_dump);
|
|
|
|
#if !defined(CONFIG_DYNAMIC_DEBUG)
|
|
/**
|
|
* print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
|
|
* @prefix_str: string to prefix each line with;
|
|
* caller supplies trailing spaces for alignment if desired
|
|
* @prefix_type: controls whether prefix of an offset, address, or none
|
|
* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
|
|
* @buf: data blob to dump
|
|
* @len: number of bytes in the @buf
|
|
*
|
|
* Calls print_hex_dump(), with log level of KERN_DEBUG,
|
|
* rowsize of 16, groupsize of 1, and ASCII output included.
|
|
*/
|
|
void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
|
|
const void *buf, size_t len)
|
|
{
|
|
print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1,
|
|
buf, len, true);
|
|
}
|
|
EXPORT_SYMBOL(print_hex_dump_bytes);
|
|
#endif /* !defined(CONFIG_DYNAMIC_DEBUG) */
|
|
#endif /* defined(CONFIG_PRINTK) */
|