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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * The 'exception' command can be used for testing exception handling.
- *
- * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
- */
- #include <common.h>
- #include <command.h>
- static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- /*
- * The LDRD instruction requires the data source to be four byte aligned
- * even if strict alignment fault checking is disabled in the system
- * control register.
- */
- asm volatile (
- "MOV r5, sp\n"
- "ADD r5, #1\n"
- "LDRD r6, r7, [r5]\n");
- return CMD_RET_FAILURE;
- }
- static int do_breakpoint(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- asm volatile ("BKPT #123\n");
- return CMD_RET_FAILURE;
- }
- static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
- char *const argv[])
- {
- /*
- * 0xe7f...f. is undefined in ARM mode
- * 0xde.. is undefined in Thumb mode
- */
- asm volatile (".word 0xe7f7defb\n");
- return CMD_RET_FAILURE;
- }
- static struct cmd_tbl cmd_sub[] = {
- U_BOOT_CMD_MKENT(breakpoint, CONFIG_SYS_MAXARGS, 1, do_breakpoint,
- "", ""),
- U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
- "", ""),
- U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
- "", ""),
- };
- static char exception_help_text[] =
- "<ex>\n"
- " The following exceptions are available:\n"
- " breakpoint - prefetch abort\n"
- " unaligned - data abort\n"
- " undefined - undefined instruction\n"
- ;
- #include <exception.h>
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