1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
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
205
206
207
208
|
/*
* (C) Copyright 2003
* Tait Electronics Limited, Christchurch, New Zealand
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* 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>
#include <mapmem.h>
#include <asm/io.h>
#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;
static const op_tbl_t op_table [] = {
{ "-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)
{
long l = 0;
unsigned long addr;
void *buf;
/* if the parameter starts with a * then assume is a pointer to the value we want */
if (s[0] == '*') {
addr = simple_strtoul(&s[1], NULL, 16);
buf = map_physmem(addr, w, MAP_WRBACK);
if (!buf && addr) {
puts("Failed to map physical memory\n");
return 0;
}
switch (w) {
case 1:
l = (long)(*(u8 *)buf);
break;
case 2:
l = (long)(*(u16 *)buf);
break;
case 4:
l = (long)(*(u32 *)buf);
break;
}
unmap_physmem(buf, w);
return l;
} else {
l = simple_strtoul(s, NULL, 16);
}
/* avoid overflow on mask calculus */
return (w >= sizeof(long)) ? l : (l & ((1UL << (w * 8)) - 1));
}
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);
} 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]);
} else {
return s;
}
}
static int stringcomp(char *s, char *t, int op)
{
int p;
char *l, *r;
l = evalstr(s);
r = evalstr(t);
p = strcmp(l, r);
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);
}
static int binary_test(char *op, char *arg1, char *arg2, int w)
{
int len, i;
const op_tbl_t *optp;
len = strlen(op);
for (optp = (op_tbl_t *)&op_table, i = 0;
i < ARRAY_SIZE(op_table);
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 */
static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int value, w;
/* Validate arguments */
if ((argc != 4))
return CMD_RET_USAGE;
/* 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,
"return true/false on integer compare",
"[.b, .w, .l, .s] [*]value1 <op> [*]value2"
);
|
