cmd: exception: unaligned data access on RISC-V
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>
diff --git a/cmd/riscv/exception.c b/cmd/riscv/exception.c
index 3c8dbbe..9687cec 100644
--- a/cmd/riscv/exception.c
+++ b/cmd/riscv/exception.c
@@ -8,6 +8,18 @@
#include <common.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,
char *const argv[])
{
@@ -16,6 +28,8 @@
}
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,
"", ""),
};
@@ -23,7 +37,8 @@
static char exception_help_text[] =
"<ex>\n"
" The following exceptions are available:\n"
- " undefined - undefined instruction\n"
+ " undefined - illegal instruction\n"
+ " unaligned - load address misaligned\n"
;
#include <exception.h>