[J-u-boot.git] / cmd / arm / exception.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * The 'exception' command can be used for testing exception handling.
 *
 * Copyright (c) 2018, Heinrich Schuchardt <[email protected]>
 */

#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>
Commit	Line	Data
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>
dab8788a HS	9
09140113 SG	10	static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	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,
09140113 SG	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,
09140113 SG	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>