mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
91e4b7516d
The ebreak instruction should generate a breakpoint exception. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Rick Chen <rick@andestech.com>
54 lines
1.3 KiB
C
54 lines
1.3 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_ebreak(struct cmd_tbl *cmdtp, int flag, int argc,
|
|
char *const argv[])
|
|
{
|
|
asm volatile ("ebreak\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
|
|
char *const argv[])
|
|
{
|
|
asm volatile (
|
|
"auipc a1, 0\n"
|
|
"ori a1, a1, 3\n"
|
|
"lw a2, (0)(a1)\n"
|
|
);
|
|
printf("The system supports unaligned access.\n");
|
|
return CMD_RET_SUCCESS;
|
|
}
|
|
|
|
static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
|
|
char *const argv[])
|
|
{
|
|
asm volatile (".word 0xffffffff\n");
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
static struct cmd_tbl cmd_sub[] = {
|
|
U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak,
|
|
"", ""),
|
|
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"
|
|
" ebreak - breakpoint\n"
|
|
" undefined - illegal instruction\n"
|
|
" unaligned - load address misaligned\n"
|
|
;
|
|
|
|
#include <exception.h>
|