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dab8788a HS |
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 <[email protected]> | |
6 | */ | |
7 | ||
dab8788a HS |
8 | #include <command.h> |
9 | ||
09140113 SG |
10 | static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc, |
11 | char *const argv[]) | |
dab8788a HS |
12 | { |
13 | /* | |
14 | * The LDRD instruction requires the data source to be four byte aligned | |
15 | * even if strict alignment fault checking is disabled in the system | |
16 | * control register. | |
17 | */ | |
18 | asm volatile ( | |
19 | "MOV r5, sp\n" | |
20 | "ADD r5, #1\n" | |
21 | "LDRD r6, r7, [r5]\n"); | |
22 | return CMD_RET_FAILURE; | |
23 | } | |
24 | ||
09140113 SG |
25 | static int do_breakpoint(struct cmd_tbl *cmdtp, int flag, int argc, |
26 | char *const argv[]) | |
dab8788a HS |
27 | { |
28 | asm volatile ("BKPT #123\n"); | |
29 | return CMD_RET_FAILURE; | |
30 | } | |
31 | ||
09140113 SG |
32 | static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc, |
33 | char *const argv[]) | |
dab8788a HS |
34 | { |
35 | /* | |
36 | * 0xe7f...f. is undefined in ARM mode | |
37 | * 0xde.. is undefined in Thumb mode | |
38 | */ | |
39 | asm volatile (".word 0xe7f7defb\n"); | |
40 | return CMD_RET_FAILURE; | |
41 | } | |
42 | ||
09140113 | 43 | static struct cmd_tbl cmd_sub[] = { |
dab8788a HS |
44 | U_BOOT_CMD_MKENT(breakpoint, CONFIG_SYS_MAXARGS, 1, do_breakpoint, |
45 | "", ""), | |
46 | U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned, | |
47 | "", ""), | |
48 | U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined, | |
49 | "", ""), | |
50 | }; | |
51 | ||
52 | static char exception_help_text[] = | |
53 | "<ex>\n" | |
54 | " The following exceptions are available:\n" | |
55 | " breakpoint - prefetch abort\n" | |
56 | " unaligned - data abort\n" | |
57 | " undefined - undefined instruction\n" | |
58 | ; | |
59 | ||
60 | #include <exception.h> |