cmd/itest.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2003
   4  * Tait Electronics Limited, Christchurch, New Zealand
   5  */
   6
   7 /*
   8  * This file provides a shell like 'test' function to return
   9  * true/false from an integer or string compare of two memory
  10  * locations or a location and a scalar/literal.
  11  * A few parts were lifted from bash 'test' command
  12  */
  13
  14 #include <common.h>
  15 #include <config.h>
  16 #include <command.h>
  17 #include <env.h>
  18 #include <mapmem.h>
  19
  20 #include <asm/io.h>
  21
  22 #define EQ      0
  23 #define NE      1
  24 #define LT      2
  25 #define GT      3
  26 #define LE      4
  27 #define GE      5
  28
  29 struct op_tbl_s {
  30         char    *op;            /* operator string */
  31         int     opcode;         /* internal representation of opcode */
  32 };
  33
  34 typedef struct op_tbl_s op_tbl_t;
  35
  36 static const op_tbl_t op_table [] = {
  37         { "-lt", LT },
  38         { "<"  , LT },
  39         { "-gt", GT },
  40         { ">"  , GT },
  41         { "-eq", EQ },
  42         { "==" , EQ },
  43         { "-ne", NE },
  44         { "!=" , NE },
  45         { "<>" , NE },
  46         { "-ge", GE },
  47         { ">=" , GE },
  48         { "-le", LE },
  49         { "<=" , LE },
  50 };
  51
  52 static long evalexp(char *s, int w)
  53 {
  54         long l = 0;
  55         unsigned long addr;
  56         void *buf;
  57
  58         /* if the parameter starts with a * then assume is a pointer to the value we want */
  59         if (s[0] == '*') {
  60                 addr = simple_strtoul(&s[1], NULL, 16);
  61                 buf = map_physmem(addr, w, MAP_WRBACK);
  62                 if (!buf && addr) {
  63                         puts("Failed to map physical memory\n");
  64                         return 0;
  65                 }
  66                 switch (w) {
  67                 case 1:
  68                         l = (long)(*(u8 *)buf);
  69                         break;
  70                 case 2:
  71                         l = (long)(*(u16 *)buf);
  72                         break;
  73                 case 4:
  74                         l = (long)(*(u32 *)buf);
  75                         break;
  76 #ifdef CONFIG_PHYS_64BIT
  77                 case 8:
  78                         l = (long)(*(unsigned long *)buf);
  79                         break;
  80 #endif
  81                 }
  82                 unmap_physmem(buf, w);
  83                 return l;
  84         } else {
  85                 l = simple_strtoul(s, NULL, 16);
  86         }
  87
  88         /* avoid overflow on mask calculus */
  89         return (w >= sizeof(long)) ? l : (l & ((1UL << (w * 8)) - 1));
  90 }
  91
  92 static char * evalstr(char *s)
  93 {
  94         /* if the parameter starts with a * then assume a string pointer else its a literal */
  95         if (s[0] == '*') {
  96                 return (char *)simple_strtoul(&s[1], NULL, 16);
  97         } else if (s[0] == '$') {
  98                 int i = 2;
  99
 100                 if (s[1] != '{')
 101                         return NULL;
 102
 103                 while (s[i] != '}') {
 104                         if (s[i] == 0)
 105                                 return NULL;
 106                         i++;
 107                 }
 108                 s[i] = 0;
 109                 return  env_get((const char *)&s[2]);
 110         } else {
 111                 return s;
 112         }
 113 }
 114
 115 static int stringcomp(char *s, char *t, int op)
 116 {
 117         int p;
 118         char *l, *r;
 119
 120         l = evalstr(s);
 121         r = evalstr(t);
 122
 123         p = strcmp(l, r);
 124         switch (op) {
 125         case EQ: return (p == 0);
 126         case NE: return (p != 0);
 127         case LT: return (p < 0);
 128         case GT: return (p > 0);
 129         case LE: return (p <= 0);
 130         case GE: return (p >= 0);
 131         }
 132         return (0);
 133 }
 134
 135 static int arithcomp (char *s, char *t, int op, int w)
 136 {
 137         long l, r;
 138
 139         l = evalexp (s, w);
 140         r = evalexp (t, w);
 141
 142         switch (op) {
 143         case EQ: return (l == r);
 144         case NE: return (l != r);
 145         case LT: return (l < r);
 146         case GT: return (l > r);
 147         case LE: return (l <= r);
 148         case GE: return (l >= r);
 149         }
 150         return (0);
 151 }
 152
 153 static int binary_test(char *op, char *arg1, char *arg2, int w)
 154 {
 155         int len, i;
 156         const op_tbl_t *optp;
 157
 158         len = strlen(op);
 159
 160         for (optp = (op_tbl_t *)&op_table, i = 0;
 161              i < ARRAY_SIZE(op_table);
 162              optp++, i++) {
 163
 164                 if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
 165                         if (w == 0) {
 166                                 return (stringcomp(arg1, arg2, optp->opcode));
 167                         } else {
 168                                 return (arithcomp (arg1, arg2, optp->opcode, w));
 169                         }
 170                 }
 171         }
 172
 173         printf("Unknown operator '%s'\n", op);
 174         return 0;       /* op code not found */
 175 }
 176
 177 /* command line interface to the shell test */
 178 static int do_itest(struct cmd_tbl *cmdtp, int flag, int argc,
 179                     char *const argv[])
 180 {
 181         int     value, w;
 182
 183         /* Validate arguments */
 184         if ((argc != 4))
 185                 return CMD_RET_USAGE;
 186
 187         /* Check for a data width specification.
 188          * Defaults to long (4) if no specification.
 189          * Uses -2 as 'width' for .s (string) so as not to upset existing code
 190          */
 191         switch (w = cmd_get_data_size(argv[0], 4)) {
 192         case 1:
 193         case 2:
 194         case 4:
 195 #ifdef CONFIG_PHYS_64BIT
 196         case 8:
 197 #endif
 198                 value = binary_test (argv[2], argv[1], argv[3], w);
 199                 break;
 200         case -2:
 201                 value = binary_test (argv[2], argv[1], argv[3], 0);
 202                 break;
 203         case -1:
 204         default:
 205                 puts("Invalid data width specifier\n");
 206                 value = 0;
 207                 break;
 208         }
 209
 210         return !value;
 211 }
 212
 213 U_BOOT_CMD(
 214         itest, 4, 0, do_itest,
 215         "return true/false on integer compare",
 216 #ifdef CONFIG_PHYS_64BIT
 217         "[.b, .w, .l, .q, .s] [*]value1 <op> [*]value2"
 218 #else
 219         "[.b, .w, .l, .s] [*]value1 <op> [*]value2"
 220 #endif
 221 );