mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
dab8788a8c
The 'exception' command allows to test exception handling. This implementation supports ARM, x86, RISC-V and the following exceptions: * 'breakpoint' - prefetch abort exception (ARM 32bit only) * 'unaligned' - data abort exception (ARM only) * 'undefined' - undefined instruction exception Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
// 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>
|