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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2022 Aidan MacDonald
*
* 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 "system.h"
#include "backtrace.h"
#include "lcd.h"
#include "backlight-target.h"
#include "font.h"
#include "logf.h"
#include "mips.h"
#undef sp /* breaks backtrace lib */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
/* copies exception frame info and error pc to the backtrace context */
static void setup_exception_bt(struct mips_exception_frame* frame,
unsigned long epc, struct mips_bt_context* ctx)
{
ctx->pc = (void*)epc;
ctx->sp = (void*)frame->gpr[29 - 3];
ctx->depth = 0;
ctx->valid = (1 << MIPSBT_RA);
ctx->reg[MIPSBT_RA] = frame->gpr[31 - 3];
}
/* dump backtrace for an exception */
static void exception_bt(void* frame, unsigned long epc, unsigned* line)
{
struct mips_bt_context ctx;
setup_exception_bt(frame, epc, &ctx);
rb_backtrace_ctx(&ctx, line);
}
/*
* TODO: This should be converted into a generic panic routine that accepts
* a backtrace context argument but the ARM backtrace setup will need to be
* refactored in order to do that
*/
static void exception_dump(void* frame, unsigned long epc,
const char* fmt, ...)
{
extern char panic_buf[128];
va_list ap;
set_irq_level(DISABLE_INTERRUPTS);
va_start(ap, fmt);
vsnprintf(panic_buf, sizeof(panic_buf), fmt, ap);
va_end(ap);
lcd_set_viewport(NULL);
#if LCD_DEPTH > 1
lcd_set_backdrop(NULL);
lcd_set_drawinfo(DRMODE_SOLID, LCD_BLACK, LCD_WHITE);
#endif
lcd_clear_display();
lcd_setfont(FONT_SYSFIXED);
unsigned y = 1;
lcd_puts(1, y++, "*EXCEPTION*");
/* wrap panic message */
{
const int linechars = (LCD_WIDTH / SYSFONT_WIDTH) - 2;
int pos = 0, len = strlen(panic_buf);
while(len > 0) {
int idx = pos + MIN(len, linechars);
char c = panic_buf[idx];
panic_buf[idx] = 0;
lcd_puts(1, y++, &panic_buf[pos]);
panic_buf[idx] = c;
len -= linechars;
pos += linechars;
}
}
exception_bt(frame, epc, &y);
#ifdef ROCKBOX_HAS_LOGF
logf_panic_dump(&y);
#endif
lcd_update();
backlight_hw_on();
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
if (cpu_boost_lock())
{
set_cpu_frequency(0);
cpu_boost_unlock();
}
#endif
#ifdef HAVE_ATA_POWER_OFF
ide_power_enable(false);
#endif
system_exception_wait();
system_reboot();
while(1);
}
#define EXC(x,y) case (x): return (y);
static char* parse_exception(unsigned long cause)
{
switch(cause & M_CauseExcCode)
{
EXC(EXC_INT, "Interrupt");
EXC(EXC_MOD, "TLB Modified");
EXC(EXC_TLBL, "TLB Exception (Load or Ifetch)");
EXC(EXC_ADEL, "Address Error (Load or Ifetch)");
EXC(EXC_ADES, "Address Error (Store)");
EXC(EXC_TLBS, "TLB Exception (Store)");
EXC(EXC_IBE, "Instruction Bus Error");
EXC(EXC_DBE, "Data Bus Error");
EXC(EXC_SYS, "Syscall");
EXC(EXC_BP, "Breakpoint");
EXC(EXC_RI, "Reserved Instruction");
EXC(EXC_CPU, "Coprocessor Unusable");
EXC(EXC_OV, "Overflow");
EXC(EXC_TR, "Trap Instruction");
EXC(EXC_FPE, "Floating Point Exception");
EXC(EXC_C2E, "COP2 Exception");
EXC(EXC_MDMX, "MDMX Exception");
EXC(EXC_WATCH, "Watch Exception");
EXC(EXC_MCHECK, "Machine Check Exception");
EXC(EXC_CacheErr, "Cache error caused re-entry to Debug Mode");
default:
return 0;
}
}
#undef EXC
void exception_handler(void* frame, unsigned long epc)
{
unsigned long cause = read_c0_cause();
exception_dump(frame, epc, "%s [0x%08x] at %08lx",
parse_exception(cause), read_c0_badvaddr(), epc);
}
void cache_error_handler(void* frame, unsigned long epc)
{
exception_dump(frame, epc, "Cache Error [0x%08x] at %08lx",
read_c0_cacheerr(), epc);
}
void tlb_refill_handler(void* frame, unsigned long epc)
{
exception_dump(frame, epc, "TLB refill at %08lx [0x%x]",
epc, read_c0_badvaddr());
}
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