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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007 Michal Simek
*
* Michal SIMEK <monstr@monstr.eu>
*/
#include <common.h>
#include <hang.h>
#include <asm/asm.h>
void _hw_exception_handler (void)
{
int address = 0;
int state = 0;
/* loading address of exception EAR */
MFS(address, rear);
/* loading exception state register ESR */
MFS(state, resr);
printf("Hardware exception at 0x%x address\n", address);
R17(address);
if (CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_DELAY_SLOT_EXCEP) &&
(state & 0x1000)) {
/*
* For exceptions in delay slots, the return address is stored
* in the Branch Target Register (BTR), rather than R17.
*/
MFS(address, rbtr);
puts("Exception in delay slot\n");
}
switch (state & 0x1f) { /* mask on exception cause */
case 0x1:
puts("Unaligned data access exception\n");
printf("Unaligned %sword access\n", ((state & 0x800) ? "" : "half"));
printf("Unaligned %s access\n", ((state & 0x400) ? "store" : "load"));
printf("Register R%x\n", (state & 0x3E0) >> 5);
break;
case 0x2:
puts("Illegal op-code exception\n");
break;
case 0x3:
puts("Instruction bus error exception\n");
break;
case 0x4:
puts("Data bus error exception\n");
break;
case 0x5:
puts("Divide by zero exception\n");
break;
case 0x7:
puts("Priviledged or stack protection violation exception\n");
break;
default:
puts("Undefined cause\n");
break;
}
printf("Return address from exception 0x%x\n", address);
hang();
}
#if CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_USR_EXCEP)
void _exception_handler (void)
{
puts("User vector_exception\n");
hang();
}
#endif
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