diff options
Diffstat (limited to 'lib/hexdump.c')
| -rw-r--r-- | lib/hexdump.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/lib/hexdump.c b/lib/hexdump.c new file mode 100644 index 00000000000..33e3e6e5182 --- /dev/null +++ b/lib/hexdump.c @@ -0,0 +1,187 @@ +// 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 <vsprintf.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 */ |