exception.c
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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(cmd_tbl_t *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(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
asm volatile ("BKPT #123\n");
return CMD_RET_FAILURE;
}
static int do_undefined(cmd_tbl_t *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 cmd_tbl_t 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>