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https://github.com/AsahiLinux/u-boot
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d1114b8340
The correct mask for getting the source/destination register from ESR in the case of an unaligned access exception is 0x3E0. With this change, a dummy unaligned store produces the expected info: """ >> swi r5, r0, 0x111 ... Hardware exception at 0x111 address Unaligned data access exception Unaligned word access Unaligned store access Register R5 Return address from exception 0x7f99dfc ### ERROR ### Please RESET the board ### """ Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com> Link: https://lore.kernel.org/r/20220213080925.1548411-6-ovidiu.panait@windriver.com Signed-off-by: Michal Simek <michal.simek@xilinx.com>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2007 Michal Simek
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*
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* Michal SIMEK <monstr@monstr.eu>
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*/
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#include <common.h>
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#include <hang.h>
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#include <asm/asm.h>
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void _hw_exception_handler (void)
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{
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int address = 0;
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int state = 0;
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/* loading address of exception EAR */
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MFS(address, rear);
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/* loading excetpion state register ESR */
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MFS(state, resr);
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printf("Hardware exception at 0x%x address\n", address);
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R17(address);
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if (CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_DELAY_SLOT_EXCEP) &&
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(state & 0x1000)) {
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/*
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* For exceptions in delay slots, the return address is stored
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* in the Branch Target Register (BTR), rather than R17.
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*/
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MFS(address, rbtr);
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puts("Exception in delay slot\n");
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}
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switch (state & 0x1f) { /* mask on exception cause */
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case 0x1:
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puts("Unaligned data access exception\n");
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printf("Unaligned %sword access\n", ((state & 0x800) ? "" : "half"));
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printf("Unaligned %s access\n", ((state & 0x400) ? "store" : "load"));
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printf("Register R%x\n", (state & 0x3E0) >> 5);
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break;
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case 0x2:
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puts("Illegal op-code exception\n");
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break;
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case 0x3:
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puts("Instruction bus error exception\n");
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break;
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case 0x4:
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puts("Data bus error exception\n");
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break;
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case 0x5:
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puts("Divide by zero exception\n");
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break;
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case 0x7:
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puts("Priviledged or stack protection violation exception\n");
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break;
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default:
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puts("Undefined cause\n");
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break;
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}
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printf("Return address from exception 0x%x\n", address);
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hang();
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}
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#if CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_USR_EXCEP)
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void _exception_handler (void)
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{
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puts("User vector_exception\n");
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hang();
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}
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#endif
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