Often during debugging session it's very interesting to see what data we were dealing with. For example what we write or read to/from memory or peripherals.

This change introduces functions that allow to dump binary data with one simple function invocation like: ------------------->8---------------- print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf, len); ------------------->8----------------

which gives us the following: ------------------->8---------------- 00000000: f2 b7 c9 88 62 61 75 64 72 61 74 65 3d 31 31 35 ....baudrate=115 00000010: 32 30 30 00 62 6f 6f 74 61 72 67 73 3d 63 6f 6e 200.bootargs=con 00000020: 73 6f 6c 65 3d 74 74 79 53 33 2c 31 31 35 32 30 sole=ttyS3,11520 00000030: 30 6e 38 00 62 6f 6f 74 64 65 6c 61 79 3d 33 00 0n8.bootdelay=3. 00000040: 62 6f 6f 74 66 69 6c 65 3d 75 49 6d 61 67 65 00 bootfile=uImage. 00000050: 66 64 74 63 6f 6e 74 72 6f 6c 61 64 64 72 3d 39 fdtcontroladdr=9 00000060: 66 66 62 31 62 61 30 00 6c 6f 61 64 61 64 64 72 ffb1ba0.loadaddr 00000070: 3d 30 78 38 32 30 30 30 30 30 30 00 73 74 64 65 =0x82000000.stde 00000080: 72 72 3d 73 65 72 69 61 6c 30 40 65 30 30 32 32 rr=serial0@e0022 00000090: 30 30 30 00 73 74 64 69 6e 3d 73 65 72 69 61 6c 000.stdin=serial 000000a0: 30 40 65 30 30 32 32 30 30 30 00 73 74 64 6f 75 0@e0022000.stdou 000000b0: 74 3d 73 65 72 69 61 6c 30 40 65 30 30 32 32 30 t=serial0@e00220 000000c0: 30 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00.............. ... ------------------->8----------------

Source of hexdump.c was copied from Linux kernel v4.7-rc2.

Signed-off-by: Alexey Brodkin abrodkin@synopsys.com Reviewed-by: Stefan Roese sr@denx.de Cc: Tom Rini trini@konsulko.com

---

Changes v1 -> v2: * Move hexdump definitions to a separate header. * Move helper funcions to the header so they might be used even if CONFIG_HEXDUMP is not enabled and if not used they will not occupy extra bytes of memory being "static inline" ones. * While at it replace its own hex_asc[], hex_asc_{lo|hi}() and pack_hex_byte() in lib/vsprintf.c with generic ones from hexdump. * In print_hex_dump() revert back first parametr for debug level, otherwise existing users of the function will be broken.

include/common.h | 1 + include/hexdump.h | 108 +++++++++++++++++++++++ include/linux/compat.h | 1 - lib/Kconfig | 5 ++ lib/Makefile | 1 + lib/hexdump.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++++ lib/vsprintf.c | 17 +--- 7 files changed, 351 insertions(+), 15 deletions(-) create mode 100644 include/hexdump.h create mode 100644 lib/hexdump.c

diff --git a/include/common.h b/include/common.h index f9f4605..51a438c 100644 --- a/include/common.h +++ b/include/common.h @@ -23,6 +23,7 @@ typedef volatile unsigned char vu_char; #include <linux/stringify.h> #include <asm/ptrace.h> #include <stdarg.h> +#include <hexdump.h> #include <linux/kernel.h> #if defined(CONFIG_PCI) && defined(CONFIG_4xx) #include <pci.h> diff --git a/include/hexdump.h b/include/hexdump.h new file mode 100644 index 0000000..de2e565 --- /dev/null +++ b/include/hexdump.h @@ -0,0 +1,108 @@ +/* + * Copyright (C) 2016 Synopsys, Inc. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef HEXDUMP_H +#define HEXDUMP_H + +#include <linux/ctype.h> + +enum { + DUMP_PREFIX_NONE, + DUMP_PREFIX_ADDRESS, + DUMP_PREFIX_OFFSET +}; + +extern const char hex_asc[]; +#define hex_asc_lo(x) hex_asc[((x) & 0x0f)] +#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] + +static inline char *hex_byte_pack(char *buf, u8 byte) +{ + *buf++ = hex_asc_hi(byte); + *buf++ = hex_asc_lo(byte); + return buf; +} + +/** + * 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. + */ +static inline 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; +} + +/** + * 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. + */ +static inline 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; +} + +/** + * bin2hex - convert binary data to an ascii hexadecimal string + * @dst: ascii hexadecimal result + * @src: binary data + * @count: binary data length + */ +static inline char *bin2hex(char *dst, const void *src, size_t count) +{ + const unsigned char *_src = src; + + while (count--) + dst = hex_byte_pack(dst, *_src++); + return dst; +} + + +#ifdef CONFIG_HEXDUMP +int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize, + char *linebuf, size_t linebuflen, bool ascii); +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); +void print_hex_dump_bytes(const char *prefix_str, int prefix_type, + const void *buf, size_t len); +#else /* !CONFIG_HEXDUMP */ +/* + * Some code in U-Boot copy-pasted from Linux kernel uses both + * functions below so to keep stuff compilable we keep these stubs here. + */ +static inline 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) +{ +} +static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type, + const void *buf, size_t len) +{ +} +#endif /* CONFIG_HEXDUMP */ + +#endif /* HEXDUMP_H */ diff --git a/include/linux/compat.h b/include/linux/compat.h index 0ce7d65..074a85e 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -193,7 +193,6 @@ typedef unsigned long blkcnt_t; #define init_waitqueue_head(...) do { } while (0) #define wait_event_interruptible(...) 0 #define wake_up_interruptible(...) do { } while (0) -#define print_hex_dump(...) do { } while (0) #define dump_stack(...) do { } while (0)

#define task_pid_nr(x) 0 diff --git a/lib/Kconfig b/lib/Kconfig index 2b97c2b..a563b5e 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -128,6 +128,11 @@ config ERRNO_STR - if errno is null or positive number - a pointer to "Success" message - if errno is negative - a pointer to errno related message

+config HEXDUMP + bool "Enable hexdump" + help + This enables functions for printing dumps of binary data. + config OF_LIBFDT bool "Enable the FDT library" default y if OF_CONTROL diff --git a/lib/Makefile b/lib/Makefile index 02dfa29..1bf7c37 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -76,6 +76,7 @@ obj-y += membuff.o obj-$(CONFIG_REGEX) += slre.o obj-y += string.o obj-y += time.o +obj-y += hexdump.o obj-$(CONFIG_TRACE) += trace.o obj-$(CONFIG_LIB_UUID) += uuid.o obj-$(CONFIG_LIB_RAND) += rand.o diff --git a/lib/hexdump.c b/lib/hexdump.c new file mode 100644 index 0000000..ffee5ce --- /dev/null +++ b/lib/hexdump.c @@ -0,0 +1,233 @@ +/* + * 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 <common.h> +#include <linux/ctype.h> +#include <linux/compat.h> +#include <linux/log2.h> +#include <asm/unaligned.h> + +const char hex_asc[] = "0123456789abcdef"; +const char hex_asc_upper[] = "0123456789ABCDEF"; + +#ifdef CONFIG_HEXDUMP +/** + * 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 + * + * Return: + * The amount of bytes placed in the buffer without terminating NUL. If the + * output was truncated, then the return value is the number of bytes + * (excluding the terminating NUL) which would have been written to the final + * string if enough space had been available. + */ +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 != 16 && rowsize != 32) + rowsize = 16; + + 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; +} + +/** + * 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; + 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: + printf("%s%p: %s\n", prefix_str, 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; + } + } +} + +/** + * 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); +} + +#endif /* CONFIG_HEXDUMP */ diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 874a295..c0a0aaa 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -271,17 +271,6 @@ static char *string(char *buf, char *end, char *s, int field_width, }

#ifdef CONFIG_CMD_NET -static const char hex_asc[] = "0123456789abcdef"; -#define hex_asc_lo(x) hex_asc[((x) & 0x0f)] -#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4] - -static inline char *pack_hex_byte(char *buf, u8 byte) -{ - *buf++ = hex_asc_hi(byte); - *buf++ = hex_asc_lo(byte); - return buf; -} - static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, int precision, int flags) { @@ -291,7 +280,7 @@ static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width, int i;

for (i = 0; i < 6; i++) { - p = pack_hex_byte(p, addr[i]); + p = hex_byte_pack(p, addr[i]); if (!(flags & SPECIAL) && i != 5) *p++ = ':'; } @@ -310,8 +299,8 @@ static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width, int i;

for (i = 0; i < 8; i++) { - p = pack_hex_byte(p, addr[2 * i]); - p = pack_hex_byte(p, addr[2 * i + 1]); + p = hex_byte_pack(p, addr[2 * i]); + p = hex_byte_pack(p, addr[2 * i + 1]); if (!(flags & SPECIAL) && i != 7) *p++ = ':'; }