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https://github.com/brain-hackers/u-boot-brain
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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>
62 lines
1.4 KiB
C
62 lines
1.4 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_unaligned(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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/*
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* The LDRD instruction requires the data source to be four byte aligned
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* even if strict alignment fault checking is disabled in the system
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* control register.
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*/
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asm volatile (
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"MOV r5, sp\n"
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"ADD r5, #1\n"
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"LDRD r6, r7, [r5]\n");
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return CMD_RET_FAILURE;
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}
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static int do_breakpoint(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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asm volatile ("BKPT #123\n");
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return CMD_RET_FAILURE;
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}
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static int do_undefined(cmd_tbl_t *cmdtp, int flag, int argc,
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char * const argv[])
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{
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/*
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* 0xe7f...f. is undefined in ARM mode
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* 0xde.. is undefined in Thumb mode
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*/
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asm volatile (".word 0xe7f7defb\n");
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return CMD_RET_FAILURE;
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}
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static cmd_tbl_t cmd_sub[] = {
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U_BOOT_CMD_MKENT(breakpoint, CONFIG_SYS_MAXARGS, 1, do_breakpoint,
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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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" breakpoint - prefetch abort\n"
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" unaligned - data abort\n"
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" undefined - undefined instruction\n"
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;
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#include <exception.h>
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