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