1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2007 Michal Simek
4 *
5 * Michal  SIMEK <monstr@monstr.eu>
6 */
7
8#include <hang.h>
9#include <stdio.h>
10#include <asm/asm.h>
11
12void _hw_exception_handler (void)
13{
14	int address = 0;
15	int state = 0;
16
17	/* loading address of exception EAR */
18	MFS(address, rear);
19	/* loading exception state register ESR */
20	MFS(state, resr);
21	printf("Hardware exception at 0x%x address\n", address);
22	R17(address);
23
24	if (CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_DELAY_SLOT_EXCEP) &&
25	    (state & 0x1000)) {
26		/*
27		 * For exceptions in delay slots, the return address is stored
28		 * in the Branch Target Register (BTR), rather than R17.
29		 */
30		MFS(address, rbtr);
31
32		puts("Exception in delay slot\n");
33	}
34
35	switch (state & 0x1f) {	/* mask on exception cause */
36	case 0x1:
37		puts("Unaligned data access exception\n");
38
39		printf("Unaligned %sword access\n", ((state & 0x800) ? "" : "half"));
40		printf("Unaligned %s access\n", ((state & 0x400) ? "store" : "load"));
41		printf("Register R%x\n", (state & 0x3E0) >> 5);
42		break;
43	case 0x2:
44		puts("Illegal op-code exception\n");
45		break;
46	case 0x3:
47		puts("Instruction bus error exception\n");
48		break;
49	case 0x4:
50		puts("Data bus error exception\n");
51		break;
52	case 0x5:
53		puts("Divide by zero exception\n");
54		break;
55	case 0x7:
56		puts("Priviledged or stack protection violation exception\n");
57		break;
58	default:
59		puts("Undefined cause\n");
60		break;
61	}
62
63	printf("Return address from exception 0x%x\n", address);
64	hang();
65}
66
67#if CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_USR_EXCEP)
68void _exception_handler (void)
69{
70	puts("User vector_exception\n");
71	hang();
72}
73#endif
74