binop.c
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// SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <command.h>
#include <env.h>
#include <hexdump.h>
#include <malloc.h>
#include <mapmem.h>
#include <linux/ctype.h>
enum {
OP_ID_XOR,
OP_ID_AND,
OP_ID_OR,
};
void write_to_env_var(char *varname, u8 *result, ulong len)
{
char *str_output;
char *str_ptr;
int i;
str_output = malloc(len * 2 + 1);
str_ptr = str_output;
for (i = 0; i < len; i++) {
sprintf(str_ptr, "%02x", result[i]);
str_ptr += 2;
}
*str_ptr = '\0';
env_set(varname, str_output);
free(str_output);
}
void read_from_env_var(char *varname, u8 *result)
{
char *str_value;
str_value = env_get(varname);
if (str_value)
hex2bin(result, str_value, strlen(str_value) / 2);
else
hex2bin(result, varname, strlen(varname) / 2);
}
void read_from_mem(ulong addr, u8 *result, ulong len)
{
u8 *src;
src = map_sysmem(addr, len);
memcpy(result, src, len);
unmap_sysmem(src);
}
void write_to_mem(char *varname, u8 *result, ulong len)
{
ulong addr;
u8 *buf;
addr = simple_strtoul(varname, NULL, 16);
buf = map_sysmem(addr, len);
memcpy(buf, result, len);
unmap_sysmem(buf);
}
static int do_binop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
ulong len;
u8 *result, *src1, *src2;
char *oparg, *lenarg, *src1arg, *src2arg, *destarg;
int i, op;
if (argc < 5)
return CMD_RET_USAGE;
oparg = argv[1];
lenarg = argv[2];
src1arg = argv[3];
src2arg = argv[4];
if (!strcmp(oparg, "xor"))
op = OP_ID_XOR;
else if (!strcmp(oparg, "or"))
op = OP_ID_OR;
else if (!strcmp(oparg, "and"))
op = OP_ID_AND;
else
return CMD_RET_USAGE;
len = simple_strtoul(lenarg, NULL, 10);
src1 = malloc(len);
src2 = malloc(len);
if (*src1arg == '*')
read_from_mem(simple_strtoul(src1arg + 1, NULL, 16), src1, len);
else
read_from_env_var(src1arg, src1);
if (*src2arg == '*')
read_from_mem(simple_strtoul(src2arg + 1, NULL, 16), src2, len);
else
read_from_env_var(src2arg, src2);
result = malloc(len);
switch (op) {
case OP_ID_XOR:
for (i = 0; i < len; i++)
result[i] = src1[i] ^ src2[i];
break;
case OP_ID_OR:
for (i = 0; i < len; i++)
result[i] = src1[i] | src2[i];
break;
case OP_ID_AND:
for (i = 0; i < len; i++)
result[i] = src1[i] & src2[i];
break;
}
if (argc == 5) {
for (i = 0; i < len; i++) {
printf("%02x ", result[i]);
if (i % 16 == 15)
puts("\n");
}
puts("\n");
goto exit;
}
destarg = argv[5];
if (*destarg == '*')
write_to_mem(destarg + 1, result, len); /* Skip asterisk */
else
write_to_env_var(destarg, result, len);
exit:
free(result);
free(src2);
free(src1);
return 0;
}
U_BOOT_CMD(
binop, 6, 1, do_binop,
"compute binary operation",
"op count [*]src1 [*]src2 [[*]dest]\n"
" - compute binary operation of data at/in src1 and\n src2 (either *memaddr, env var name or hex string)\n and store result in/at dest, where op is one of\n xor, or, and."
);