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// SPDX-License-Identifier: GPL-2.0+
/*
* 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 <hexdump.h>
#include <mapmem.h>
#include <stdio.h>
#include <linux/ctype.h>
#include <linux/compat.h>
#include <linux/log2.h>
#include <asm/unaligned.h>
#define MAX_LINE_LENGTH_BYTES 64
const char hex_asc[] = "0123456789abcdef";
const char hex_asc_upper[] = "0123456789ABCDEF";
#if CONFIG_IS_ENABLED(HEXDUMP)
int 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;
int ngroups;
u8 ch;
int j, lx = 0;
int ascii_column;
int ret;
if (!rowsize)
rowsize = 16;
else
rowsize = min(rowsize, MAX_LINE_LENGTH_BYTES);
if (len > rowsize) /* limit to one line at a time */
len = rowsize;
if (!is_power_of_2(groupsize) || groupsize > 8)
groupsize = 1;
if ((len % groupsize) != 0) /* no mixed size output */
groupsize = 1;
ngroups = len / groupsize;
ascii_column = rowsize * 2 + rowsize / groupsize + 1;
if (!linebuflen)
goto overflow1;
if (!len)
goto nil;
if (groupsize == 8) {
const u64 *ptr8 = buf;
for (j = 0; j < ngroups; j++) {
ret = snprintf(linebuf + lx, linebuflen - lx,
"%s%16.16llx", j ? " " : "",
get_unaligned(ptr8 + j));
if (ret >= linebuflen - lx)
goto overflow1;
lx += ret;
}
} else if (groupsize == 4) {
const u32 *ptr4 = buf;
for (j = 0; j < ngroups; j++) {
ret = snprintf(linebuf + lx, linebuflen - lx,
"%s%8.8x", j ? " " : "",
get_unaligned(ptr4 + j));
if (ret >= linebuflen - lx)
goto overflow1;
lx += ret;
}
} else if (groupsize == 2) {
const u16 *ptr2 = buf;
for (j = 0; j < ngroups; j++) {
ret = snprintf(linebuf + lx, linebuflen - lx,
"%s%4.4x", j ? " " : "",
get_unaligned(ptr2 + j));
if (ret >= linebuflen - lx)
goto overflow1;
lx += ret;
}
} else {
for (j = 0; j < len; j++) {
if (linebuflen < lx + 2)
goto overflow2;
ch = ptr[j];
linebuf[lx++] = hex_asc_hi(ch);
if (linebuflen < lx + 2)
goto overflow2;
linebuf[lx++] = hex_asc_lo(ch);
if (linebuflen < lx + 2)
goto overflow2;
linebuf[lx++] = ' ';
}
if (j)
lx--;
}
if (!ascii)
goto nil;
while (lx < ascii_column) {
if (linebuflen < lx + 2)
goto overflow2;
linebuf[lx++] = ' ';
}
for (j = 0; j < len; j++) {
if (linebuflen < lx + 2)
goto overflow2;
ch = ptr[j];
linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
}
nil:
linebuf[lx] = '\0';
return lx;
overflow2:
linebuf[lx++] = '\0';
overflow1:
return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
}
int print_hex_dump(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;
char linebuf[MAX_LINE_LENGTH_BYTES * 3 + 2 + MAX_LINE_LENGTH_BYTES + 1];
if (!rowsize)
rowsize = 16;
else
rowsize = min(rowsize, MAX_LINE_LENGTH_BYTES);
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:
printf("%s%0*lx: %s\n", prefix_str,
IS_ENABLED(CONFIG_PHYS_64BIT) ? 16 : 8,
(ulong)map_to_sysmem(ptr) + i, linebuf);
break;
case DUMP_PREFIX_OFFSET:
printf("%s%.8x: %s\n", prefix_str, i, linebuf);
break;
default:
printf("%s%s\n", prefix_str, linebuf);
break;
}
if (!IS_ENABLED(CONFIG_SPL_BUILD) && ctrlc())
return -EINTR;
}
return 0;
}
void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
const void *buf, size_t len)
{
print_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true);
}
#else
/*
* Some code in U-Boot copy-pasted from Linux kernel uses both
* functions below so to keep stuff compilable we keep these stubs here.
*/
int print_hex_dump(const char *prefix_str, int prefix_type, int rowsize,
int groupsize, const void *buf, size_t len, bool ascii)
{
return -ENOSYS;
}
void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
const void *buf, size_t len)
{
}
#endif /* CONFIG_HEXDUMP */
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