1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * The 'exception' command can be used for testing exception handling.
4 *
5 * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
6 */
7
8 #include <command.h>
9
do_compressed(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])10 static int do_compressed(struct cmd_tbl *cmdtp, int flag, int argc,
11 char *const argv[])
12 {
13 /* c.li a0, 0; c.li a0, 0 */
14 asm volatile (".long 0x45014501\n");
15 printf("The system supports compressed instructions.\n");
16 return CMD_RET_SUCCESS;
17 }
18
do_ebreak(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])19 static int do_ebreak(struct cmd_tbl *cmdtp, int flag, int argc,
20 char *const argv[])
21 {
22 asm volatile ("ebreak\n");
23 return CMD_RET_FAILURE;
24 }
25
do_ialign16(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])26 static int do_ialign16(struct cmd_tbl *cmdtp, int flag, int argc,
27 char *const argv[])
28 {
29 asm volatile (
30 /* jump skipping 2 bytes */
31 ".long 0x0060006f\n"
32 ".long 0x006f0000\n"
33 ".long 0x00000060\n"
34 );
35 printf("The system supports 16 bit aligned instructions.\n");
36 return CMD_RET_SUCCESS;
37 }
38
do_rdcycle(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])39 static int do_rdcycle(struct cmd_tbl *cmdtp, int flag, int argc,
40 char *const argv[])
41 {
42 printf("cycle = 0x%lx\n", csr_read(CSR_CYCLE));
43
44 return CMD_RET_SUCCESS;
45 }
46
do_unaligned(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])47 static int do_unaligned(struct cmd_tbl *cmdtp, int flag, int argc,
48 char *const argv[])
49 {
50 asm volatile (
51 "auipc a1, 0\n"
52 "ori a1, a1, 3\n"
53 "lw a2, (0)(a1)\n"
54 );
55 printf("The system supports unaligned access.\n");
56 return CMD_RET_SUCCESS;
57 }
58
do_undefined(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])59 static int do_undefined(struct cmd_tbl *cmdtp, int flag, int argc,
60 char *const argv[])
61 {
62 asm volatile (".word 0xffffffff\n");
63 return CMD_RET_FAILURE;
64 }
65
66 static struct cmd_tbl cmd_sub[] = {
67 U_BOOT_CMD_MKENT(compressed, CONFIG_SYS_MAXARGS, 1, do_compressed,
68 "", ""),
69 U_BOOT_CMD_MKENT(ebreak, CONFIG_SYS_MAXARGS, 1, do_ebreak,
70 "", ""),
71 U_BOOT_CMD_MKENT(ialign16, CONFIG_SYS_MAXARGS, 1, do_ialign16,
72 "", ""),
73 U_BOOT_CMD_MKENT(rdcycle, CONFIG_SYS_MAXARGS, 1, do_rdcycle,
74 "", ""),
75 U_BOOT_CMD_MKENT(unaligned, CONFIG_SYS_MAXARGS, 1, do_unaligned,
76 "", ""),
77 U_BOOT_CMD_MKENT(undefined, CONFIG_SYS_MAXARGS, 1, do_undefined,
78 "", ""),
79 };
80
81 U_BOOT_LONGHELP(exception,
82 "<ex>\n"
83 " The following exceptions are available:\n"
84 " compressed - compressed instruction\n"
85 " ebreak - breakpoint\n"
86 " ialign16 - 16 bit aligned instruction\n"
87 " rdcycle - read cycle CSR\n"
88 " unaligned - load address misaligned\n"
89 " undefined - illegal instruction\n");
90
91 #include <exception.h>
92