1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * The 'exception' command can be used for testing exception handling.
4 *
5 * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
6 */
7
8 #include <common.h>
9 #include <command.h>
10
do_ebreak(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])11 static int do_ebreak(struct cmd_tbl *cmdtp, int flag, int argc,
12 char *const argv[])
13 {
14 asm volatile ("ebreak\n");
15 return CMD_RET_FAILURE;
16 }
17
do_unaligned(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])18 static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
19 char *const argv[])
20 {
21 asm volatile (
22 "auipc a1, 0\n"
23 "ori a1, a1, 3\n"
24 "lw a2, (0)(a1)\n"
25 );
26 printf("The system supports unaligned access.\n");
27 return CMD_RET_SUCCESS;
28 }
29
do_undefined(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])30 static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
31 char *const argv[])
32 {
33 asm volatile (".word 0xffffffff\n");
34 return CMD_RET_FAILURE;
35 }
36
37 static struct cmd_tbl cmd_sub[] = {
38 U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak,
39 "", ""),
40 U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
41 "", ""),
42 U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
43 "", ""),
44 };
45
46 static char exception_help_text[] =
47 "<ex>\n"
48 " The following exceptions are available:\n"
49 " ebreak - breakpoint\n"
50 " undefined - illegal instruction\n"
51 " unaligned - load address misaligned\n"
52 ;
53
54 #include <exception.h>
55