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cmd: exception: unaligned data access on RISC-V

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The command 'exception' can be used to test the handling of exceptions.

Currently the exception command only allows to create an illegal
instruction exception on RISC-V.

Provide a sub-command 'exception unaligned' to cause a misaligned load
address exception.

Adjust the online help for 'exception undefined'.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Rick Chen <rick@andestech.com>
This commit is contained in:
Heinrich Schuchardt 2020-08-06 12:34:59 +02:00 committed by Andes
parent 3a85e03f83
commit db3585d181
1 changed files with 16 additions and 1 deletions
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17
cmd/riscv/exception.c
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@ -8,6 +8,18 @@
#include <common.h> #include <common.h>
#include <command.h> #include <command.h>
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, static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[]) char *const argv[])
{ {
@ -16,6 +28,8 @@ static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
} }
static struct cmd_tbl cmd_sub[] = { static struct cmd_tbl cmd_sub[] = {
U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
"", ""),
U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined, U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
"", ""), "", ""),
}; };
@ -23,7 +37,8 @@ static struct cmd_tbl cmd_sub[] = {
static char exception_help_text[] = static char exception_help_text[] =
"<ex>\n" "<ex>\n"
" The following exceptions are available:\n" " The following exceptions are available:\n"
" undefined - undefined instruction\n" " undefined - illegal instruction\n"
" unaligned - load address misaligned\n"
; ;
#include <exception.h> #include <exception.h>