u-boot/cmd/sandbox/exception.c
Heinrich Schuchardt 3a5ec03578 cmd: sandbox: implement exception command
Implement the commands

* exception undefined - execute an illegal instruction
* exception sigsegv - cause a segment violation

Here is a possible output:

    => exception undefined
    Illegal instruction
    pc = 0x55eb8d0a7575, pc_reloc = 0x57575
    Resetting ...

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-12-13 07:58:17 -07:00

41 lines
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C

// SPDX-License-Identifier: GPL-2.0+
/*
* The 'exception' command can be used for testing exception handling.
*
* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
*/
#include <common.h>
#include <command.h>
static int do_sigsegv(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
u8 *ptr = NULL;
*ptr = 0;
return CMD_RET_FAILURE;
}
static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
asm volatile (".word 0xffff\n");
return CMD_RET_FAILURE;
}
static struct cmd_tbl cmd_sub[] = {
U_BOOT_CMD_MKENT(sigsegv, CONFIG_SYS_MAXARGS, 1, do_sigsegv,
"", ""),
U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
"", ""),
};
static char exception_help_text[] =
"<ex>\n"
" The following exceptions are available:\n"
" undefined - undefined instruction\n"
" sigsegv - illegal memory access\n"
;
#include <exception.h>