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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>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'exception' command can be used for testing exception handling.
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*
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* Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#include <common.h>
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#include <command.h>
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static int do_ebreak(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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asm volatile ("ebreak\n");
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return CMD_RET_FAILURE;
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}
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static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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asm volatile (
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"auipc a1, 0\n"
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"ori a1, a1, 3\n"
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"lw a2, (0)(a1)\n"
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);
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printf("The system supports unaligned access.\n");
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return CMD_RET_SUCCESS;
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}
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static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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asm volatile (".word 0xffffffff\n");
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return CMD_RET_FAILURE;
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}
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static struct cmd_tbl cmd_sub[] = {
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U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak,
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"", ""),
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U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
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"", ""),
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U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
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"", ""),
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};
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static char exception_help_text[] =
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"<ex>\n"
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" The following exceptions are available:\n"
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" ebreak - breakpoint\n"
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" undefined - illegal instruction\n"
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" unaligned - load address misaligned\n"
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;
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#include <exception.h>
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