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89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "uart.h"
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/**
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* common exception handler
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*/
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void exc_handler(unsigned long type, unsigned long esr, unsigned long elr, unsigned long spsr, unsigned long far)
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{
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// print out interruption type
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switch(type) {
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case 0: uart_puts("Synchronous"); break;
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case 1: uart_puts("IRQ"); break;
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case 2: uart_puts("FIQ"); break;
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case 3: uart_puts("SError"); break;
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}
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uart_puts(": ");
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// decode exception type (some, not all. See ARM DDI0487B_b chapter D10.2.28)
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switch(esr>>26) {
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case 0b000000: uart_puts("Unknown"); break;
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case 0b000001: uart_puts("Trapped WFI/WFE"); break;
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case 0b001110: uart_puts("Illegal execution"); break;
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case 0b010101: uart_puts("System call"); break;
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case 0b100000: uart_puts("Instruction abort, lower EL"); break;
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case 0b100001: uart_puts("Instruction abort, same EL"); break;
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case 0b100010: uart_puts("Instruction alignment fault"); break;
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case 0b100100: uart_puts("Data abort, lower EL"); break;
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case 0b100101: uart_puts("Data abort, same EL"); break;
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case 0b100110: uart_puts("Stack alignment fault"); break;
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case 0b101100: uart_puts("Floating point"); break;
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default: uart_puts("Unknown"); break;
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}
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// decode data abort cause
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if(esr>>26==0b100100 || esr>>26==0b100101) {
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uart_puts(", ");
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switch((esr>>2)&0x3) {
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case 0: uart_puts("Address size fault"); break;
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case 1: uart_puts("Translation fault"); break;
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case 2: uart_puts("Access flag fault"); break;
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case 3: uart_puts("Permission fault"); break;
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}
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switch(esr&0x3) {
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case 0: uart_puts(" at level 0"); break;
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case 1: uart_puts(" at level 1"); break;
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case 2: uart_puts(" at level 2"); break;
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case 3: uart_puts(" at level 3"); break;
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}
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}
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// dump registers
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uart_puts(":\n ESR_EL1 ");
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uart_hex(esr>>32);
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uart_hex(esr);
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uart_puts(" ELR_EL1 ");
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uart_hex(elr>>32);
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uart_hex(elr);
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uart_puts("\n SPSR_EL1 ");
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uart_hex(spsr>>32);
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uart_hex(spsr);
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uart_puts(" FAR_EL1 ");
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uart_hex(far>>32);
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uart_hex(far);
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uart_puts("\n");
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// no return from exception for now
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while(1);
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}
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