172 lines
4.9 KiB
C
172 lines
4.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Thom Johansen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "system.h"
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#include <stdio.h>
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#include "lcd.h"
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#include "font.h"
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#include "gcc_extensions.h"
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#include <get_sp.h>
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#include <backtrace.h>
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static const char* const uiename[] = {
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"Undefined instruction",
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"Prefetch abort",
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"Data abort",
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"Divide by zero",
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"SWI"
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};
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void __attribute__((weak,naked)) data_abort_handler(void)
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{
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asm volatile(
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"sub r0, lr, #8 \n"
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"mov r1, #2 \n"
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"b UIE \n"
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);
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}
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void __attribute__((weak,naked)) software_int_handler(void)
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{
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asm volatile(
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"sub r0, lr, #4 \n"
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"mov r1, #4 \n"
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"b UIE \n"
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);
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}
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void __attribute__((weak,naked)) reserved_handler(void)
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{
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asm volatile(
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"sub r0, lr, #4 \n"
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"mov r1, #4 \n"
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"b UIE \n"
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);
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}
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void __attribute__((weak,naked)) prefetch_abort_handler(void)
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{
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asm volatile(
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"sub r0, lr, #4 \n"
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"mov r1, #1 \n"
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"b UIE \n"
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);
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}
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void __attribute__((weak,naked)) undef_instr_handler(void)
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{
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asm volatile(
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"sub r0, lr, #4 \n"
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#ifdef USE_THUMB
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"mrs r1, spsr \n"
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"tst r1, #(1 << 5) \n" // T bit set ?
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"subne r0, lr, #2 \n" // if yes, offset to THUMB instruction
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#endif
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"mov r1, #0 \n"
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"b UIE \n"
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);
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}
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/* Unexpected Interrupt or Exception handler. Currently only deals with
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exceptions, but will deal with interrupts later.
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*/
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void NORETURN_ATTR UIE(unsigned int pc, unsigned int num)
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{
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/* safe guard variable - we call backtrace() only on first
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* UIE call. This prevent endless loop if backtrace() touches
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* memory regions which cause abort
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*/
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static bool triggered = false;
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#if LCD_DEPTH > 1
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lcd_set_backdrop(NULL);
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lcd_set_drawmode(DRMODE_SOLID);
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lcd_set_foreground(LCD_BLACK);
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lcd_set_background(LCD_WHITE);
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#endif
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unsigned line = 0;
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lcd_setfont(FONT_SYSFIXED);
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lcd_set_viewport(NULL);
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lcd_clear_display();
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lcd_putsf(0, line++, "%s at %08x" IF_COP(" (%d)"), uiename[num], pc IF_COP(, CURRENT_CORE));
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#if !defined(CPU_ARM7TDMI) && (CONFIG_CPU != RK27XX) /* arm7tdmi has no MPU/MMU */
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if(num == 1 || num == 2) /* prefetch / data abort */
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{
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register unsigned status;
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#if ARM_ARCH >= 6
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/* ARMv6 has 2 different registers for prefetch & data aborts */
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if(num == 1) /* instruction prefetch abort */
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asm volatile( "mrc p15, 0, %0, c5, c0, 1\n" : "=r"(status));
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else
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#endif
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asm volatile( "mrc p15, 0, %0, c5, c0, 0\n" : "=r"(status));
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lcd_putsf(0, line++, "FSR 0x%x", status);
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unsigned int domain = (status >> 4) & 0xf;
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unsigned int fault = status & 0xf;
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#if ARM_ARCH >= 6
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fault |= (status & (1<<10)) >> 6; /* fault is 5 bits on armv6 */
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#endif
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lcd_putsf(0, line++, "(domain %d, fault %d)", domain, fault);
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if(num == 2) /* data abort */
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{
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register unsigned address;
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/* read FAR (fault address register) */
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asm volatile( "mrc p15, 0, %0, c6, c0\n" : "=r"(address));
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lcd_putsf(0, line++, "address 0x%8x", address);
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#if ARM_ARCH >= 6
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lcd_putsf(0, line++, (status & (1<<11)) ? "(write)" : "(read)");
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#endif
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}
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} /* num == 1 || num == 2 // prefetch/data abort */
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#endif /* !defined(CPU_ARM7TDMI */
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if (!triggered)
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{
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triggered = true;
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backtrace(pc, __get_sp(), &line);
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}
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lcd_update();
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disable_interrupt(IRQ_FIQ_STATUS);
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system_exception_wait(); /* If this returns, try to reboot */
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system_reboot();
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while (1); /* halt */
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}
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/* Needs to be here or gcc won't find it */
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void __attribute__((naked)) __div0(void)
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{
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asm volatile (
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"ldr r0, [sp] \r\n"
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"sub r0, r0, #4 \r\n"
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"mov r1, #3 \r\n"
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"b UIE \r\n"
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);
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}
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