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![Stephen Warren](/assets/img/avatar_default.png)
On some systems, RAM starts at address 0. If the user executes itest
against address 0 on such a system, it will call map_physmem(0, ...)
which will return 0 back; mapping only changes the address on sandbox.
This causes itest to believe map_physmem() has failed, and hence fails
the comparison.
Fix itest so that it allows map_physmem() to return 0 /if/ the orignal
address passed to it was also 0.
This fixes "tegra-uboot-flasher flash" on Tegra20.
This has the disadvantage that on sandbox, failed mapping attempts for
address 0 are not detected. Instead, should the code only call
map_physmem() on sandbox? Or, should map_physmem() return its error status
some other way. Or, should the special case only be allowed on systems
where the base of RAM is 0 somehow?
Fixes: 7861204c9a
("itest: make memory access work under sandbox")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
208 lines
3.9 KiB
C
208 lines
3.9 KiB
C
/*
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* (C) Copyright 2003
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* Tait Electronics Limited, Christchurch, New Zealand
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* This file provides a shell like 'test' function to return
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* true/false from an integer or string compare of two memory
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* locations or a location and a scalar/literal.
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* A few parts were lifted from bash 'test' command
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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#include <mapmem.h>
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#include <asm/io.h>
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#define EQ 0
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#define NE 1
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#define LT 2
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#define GT 3
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#define LE 4
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#define GE 5
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struct op_tbl_s {
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char *op; /* operator string */
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int opcode; /* internal representation of opcode */
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};
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typedef struct op_tbl_s op_tbl_t;
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static const op_tbl_t op_table [] = {
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{ "-lt", LT },
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{ "<" , LT },
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{ "-gt", GT },
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{ ">" , GT },
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{ "-eq", EQ },
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{ "==" , EQ },
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{ "-ne", NE },
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{ "!=" , NE },
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{ "<>" , NE },
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{ "-ge", GE },
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{ ">=" , GE },
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{ "-le", LE },
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{ "<=" , LE },
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};
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static long evalexp(char *s, int w)
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{
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long l = 0;
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unsigned long addr;
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void *buf;
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/* if the parameter starts with a * then assume is a pointer to the value we want */
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if (s[0] == '*') {
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addr = simple_strtoul(&s[1], NULL, 16);
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buf = map_physmem(addr, w, MAP_WRBACK);
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if (!buf && addr) {
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puts("Failed to map physical memory\n");
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return 0;
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}
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switch (w) {
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case 1:
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l = (long)(*(unsigned char *)buf);
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break;
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case 2:
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l = (long)(*(unsigned short *)buf);
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break;
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case 4:
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l = (long)(*(unsigned long *)buf);
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break;
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}
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unmap_physmem(buf, w);
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return l;
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} else {
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l = simple_strtoul(s, NULL, 16);
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}
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return l & ((1UL << (w * 8)) - 1);
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}
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static char * evalstr(char *s)
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{
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/* if the parameter starts with a * then assume a string pointer else its a literal */
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if (s[0] == '*') {
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return (char *)simple_strtoul(&s[1], NULL, 16);
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} else if (s[0] == '$') {
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int i = 2;
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if (s[1] != '{')
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return NULL;
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while (s[i] != '}') {
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if (s[i] == 0)
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return NULL;
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i++;
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}
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s[i] = 0;
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return getenv((const char *)&s[2]);
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} else {
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return s;
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}
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}
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static int stringcomp(char *s, char *t, int op)
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{
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int p;
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char *l, *r;
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l = evalstr(s);
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r = evalstr(t);
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p = strcmp(l, r);
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switch (op) {
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case EQ: return (p == 0);
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case NE: return (p != 0);
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case LT: return (p < 0);
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case GT: return (p > 0);
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case LE: return (p <= 0);
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case GE: return (p >= 0);
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}
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return (0);
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}
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static int arithcomp (char *s, char *t, int op, int w)
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{
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long l, r;
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l = evalexp (s, w);
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r = evalexp (t, w);
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switch (op) {
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case EQ: return (l == r);
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case NE: return (l != r);
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case LT: return (l < r);
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case GT: return (l > r);
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case LE: return (l <= r);
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case GE: return (l >= r);
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}
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return (0);
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}
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static int binary_test(char *op, char *arg1, char *arg2, int w)
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{
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int len, i;
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const op_tbl_t *optp;
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len = strlen(op);
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for (optp = (op_tbl_t *)&op_table, i = 0;
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i < ARRAY_SIZE(op_table);
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optp++, i++) {
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if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
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if (w == 0) {
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return (stringcomp(arg1, arg2, optp->opcode));
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} else {
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return (arithcomp (arg1, arg2, optp->opcode, w));
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}
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}
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}
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printf("Unknown operator '%s'\n", op);
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return 0; /* op code not found */
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}
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/* command line interface to the shell test */
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static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int value, w;
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/* Validate arguments */
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if ((argc != 4))
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return CMD_RET_USAGE;
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/* Check for a data width specification.
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* Defaults to long (4) if no specification.
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* Uses -2 as 'width' for .s (string) so as not to upset existing code
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*/
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switch (w = cmd_get_data_size(argv[0], 4)) {
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case 1:
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case 2:
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case 4:
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value = binary_test (argv[2], argv[1], argv[3], w);
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break;
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case -2:
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value = binary_test (argv[2], argv[1], argv[3], 0);
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break;
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case -1:
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default:
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puts("Invalid data width specifier\n");
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value = 0;
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break;
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}
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return !value;
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}
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U_BOOT_CMD(
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itest, 4, 0, do_itest,
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"return true/false on integer compare",
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"[.b, .w, .l, .s] [*]value1 <op> [*]value2"
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);
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