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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>
This commit is contained in:
Heinrich Schuchardt 2020-11-12 00:29:57 +01:00 committed by Simon Glass
parent b46f30a378
commit 3a5ec03578
4 changed files with 46 additions and 1 deletions
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2
cmd/Kconfig
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@ -1691,7 +1691,7 @@ config CMD_EFIDEBUG
config CMD_EXCEPTION
bool "exception - raise exception"
depends on ARM || RISCV || X86
depends on ARM || RISCV || SANDBOX || X86
help
Enable the 'exception' command which allows to raise an exception.

1
cmd/Makefile
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@ -193,6 +193,7 @@ obj-$(CONFIG_CMD_AVB) += avb.o
obj-$(CONFIG_ARM) += arm/
obj-$(CONFIG_RISCV) += riscv/
obj-$(CONFIG_SANDBOX) += sandbox/
obj-$(CONFIG_X86) += x86/
obj-$(CONFIG_ARCH_MVEBU) += mvebu/

3
cmd/sandbox/Makefile Normal file
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@ -0,0 +1,3 @@
# SPDX-License-Identifier: GPL-2.0+
obj-$(CONFIG_CMD_EXCEPTION) += exception.o

41
cmd/sandbox/exception.c Normal file
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@ -0,0 +1,41 @@
// 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>