itest.c 3.9 KB
Newer Older
1 2 3 4
/*
 * (C) Copyright 2003
 * Tait Electronics Limited, Christchurch, New Zealand
 *
5
 * SPDX-License-Identifier:	GPL-2.0+
6 7 8 9 10 11 12 13 14 15 16 17
 */

/*
 * This file provides a shell like 'test' function to return
 * true/false from an integer or string compare of two memory
 * locations or a location and a scalar/literal.
 * A few parts were lifted from bash 'test' command
 */

#include <common.h>
#include <config.h>
#include <command.h>
18 19 20
#include <mapmem.h>

#include <asm/io.h>
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35

#define EQ	0
#define NE	1
#define LT	2
#define GT	3
#define LE	4
#define GE	5

struct op_tbl_s {
	char	*op;		/* operator string */
	int	opcode;		/* internal representation of opcode */
};

typedef struct op_tbl_s op_tbl_t;

36
static const op_tbl_t op_table [] = {
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
	{ "-lt", LT },
	{ "<"  , LT },
	{ "-gt", GT },
	{ ">"  , GT },
	{ "-eq", EQ },
	{ "==" , EQ },
	{ "-ne", NE },
	{ "!=" , NE },
	{ "<>" , NE },
	{ "-ge", GE },
	{ ">=" , GE },
	{ "-le", LE },
	{ "<=" , LE },
};

static long evalexp(char *s, int w)
{
54
	long l = 0;
55 56
	unsigned long addr;
	void *buf;
57 58 59

	/* if the parameter starts with a * then assume is a pointer to the value we want */
	if (s[0] == '*') {
60 61
		addr = simple_strtoul(&s[1], NULL, 16);
		buf = map_physmem(addr, w, MAP_WRBACK);
62
		if (!buf && addr) {
63 64 65
			puts("Failed to map physical memory\n");
			return 0;
		}
66
		switch (w) {
67 68 69 70 71 72 73 74 75
		case 1:
			l = (long)(*(unsigned char *)buf);
			break;
		case 2:
			l = (long)(*(unsigned short *)buf);
			break;
		case 4:
			l = (long)(*(unsigned long *)buf);
			break;
76
		}
77 78
		unmap_physmem(buf, w);
		return l;
79 80 81 82
	} else {
		l = simple_strtoul(s, NULL, 16);
	}

Simon Glass's avatar
Simon Glass committed
83
	return l & ((1UL << (w * 8)) - 1);
84 85 86 87 88 89 90
}

static char * evalstr(char *s)
{
	/* if the parameter starts with a * then assume a string pointer else its a literal */
	if (s[0] == '*') {
		return (char *)simple_strtoul(&s[1], NULL, 16);
91 92 93 94 95 96 97 98 99 100 101 102 103
	} else if (s[0] == '$') {
		int i = 2;

		if (s[1] != '{')
			return NULL;

		while (s[i] != '}') {
			if (s[i] == 0)
				return NULL;
			i++;
		}
		s[i] = 0;
		return  getenv((const char *)&s[2]);
104 105 106 107 108 109 110
	} else {
		return s;
	}
}

static int stringcomp(char *s, char *t, int op)
{
111
	int p;
112 113 114 115 116
	char *l, *r;

	l = evalstr(s);
	r = evalstr(t);

117
	p = strcmp(l, r);
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
	switch (op) {
	case EQ: return (p == 0);
	case NE: return (p != 0);
	case LT: return (p < 0);
	case GT: return (p > 0);
	case LE: return (p <= 0);
	case GE: return (p >= 0);
	}
	return (0);
}

static int arithcomp (char *s, char *t, int op, int w)
{
	long l, r;

	l = evalexp (s, w);
	r = evalexp (t, w);

	switch (op) {
	case EQ: return (l == r);
	case NE: return (l != r);
	case LT: return (l < r);
	case GT: return (l > r);
	case LE: return (l <= r);
	case GE: return (l >= r);
	}
	return (0);
}

Kim Phillips's avatar
Kim Phillips committed
147
static int binary_test(char *op, char *arg1, char *arg2, int w)
148 149
{
	int len, i;
150
	const op_tbl_t *optp;
151 152 153 154

	len = strlen(op);

	for (optp = (op_tbl_t *)&op_table, i = 0;
155
	     i < ARRAY_SIZE(op_table);
156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
	     optp++, i++) {

		if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
			if (w == 0) {
				return (stringcomp(arg1, arg2, optp->opcode));
			} else {
				return (arithcomp (arg1, arg2, optp->opcode, w));
			}
		}
	}

	printf("Unknown operator '%s'\n", op);
	return 0;	/* op code not found */
}

/* command line interface to the shell test */
Kim Phillips's avatar
Kim Phillips committed
172
static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
173
{
174
	int	value, w;
175

176
	/* Validate arguments */
177
	if ((argc != 4))
178
		return CMD_RET_USAGE;
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204

	/* Check for a data width specification.
	 * Defaults to long (4) if no specification.
	 * Uses -2 as 'width' for .s (string) so as not to upset existing code
	 */
	switch (w = cmd_get_data_size(argv[0], 4)) {
	case 1:
	case 2:
	case 4:
		value = binary_test (argv[2], argv[1], argv[3], w);
		break;
	case -2:
		value = binary_test (argv[2], argv[1], argv[3], 0);
		break;
	case -1:
	default:
		puts("Invalid data width specifier\n");
		value = 0;
		break;
	}

	return !value;
}

U_BOOT_CMD(
	itest, 4, 0, do_itest,
Peter Tyser's avatar
Peter Tyser committed
205
	"return true/false on integer compare",
Wolfgang Denk's avatar
Wolfgang Denk committed
206
	"[.b, .w, .l, .s] [*]value1 <op> [*]value2"
207
);