mini/exception.c

/*
	mini - a Free Software replacement for the Nintendo/BroadOn IOS.

	exception handling

Copyright (C) 2008, 2009	Hector Martin "marcan" <marcan@marcansoft.com>
Copyright (C) 2008, 2009	Haxx Enterprises <bushing@gmail.com>

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, version 2.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/
#include "irq.h"
#include "hollywood.h"
#include "gecko.h"
#include "utils.h"
#include "ipc.h"
#include "memory.h"
#include "panic.h"

const char *exceptions[] = {
	"RESET", "UNDEFINED INSTR", "SWI", "INSTR ABORT", "DATA ABORT", "RESERVED", "IRQ", "FIQ", "(unknown exception type)"
};

const char *aborts[] = {
	"UNDEFINED",
	"Alignment",
	"UNDEFINED",
	"Alignment",
	"UNDEFINED",
	"Translation",
	"UNDEFINED",
	"Translation",
	"External abort",
	"Domain",
	"External abort",
	"Domain",
	"External abort on translation (first level)",
	"Permission",
	"External abort on translation (second level)",
	"Permission"
};

u8 domvalid[] = {0,0,0,0,0,0,0,1,0,1,0,1,0,1,1,1};

void exc_setup_stack(void);

void exception_initialize(void)
{
	exc_setup_stack();
	u32 cr = get_cr();
	cr |= 0x2; // Data alignment fault checking enable
	set_cr(cr);
}

void exc_handler(u32 type, u32 spsr, u32 *regs)
{
	if (type > 8) type = 8;
	gecko_printf("\nException %d (%s):\n", type, exceptions[type]);

	u32 pc, fsr;

	switch(type) {
		case 1: // UND
		case 2: // SWI
		case 3: // INSTR ABORT
		case 7: // FIQ
			pc = regs[15] - 4;
			break;
		case 4: // DATA ABORT
			pc = regs[15] - 8;
			break;
		default:
			pc = regs[15];
			break;
	}

	gecko_printf("Registers (%p):\n", regs);
	gecko_printf("  R0-R3: %08x %08x %08x %08x\n", regs[0], regs[1], regs[2], regs[3]);
	gecko_printf("  R4-R7: %08x %08x %08x %08x\n", regs[4], regs[5], regs[6], regs[7]);
	gecko_printf(" R8-R11: %08x %08x %08x %08x\n", regs[8], regs[9], regs[10], regs[11]);
	gecko_printf("R12-R15: %08x %08x %08x %08x\n", regs[12], regs[13], regs[14], pc);

	gecko_printf("SPSR: %08x\n", spsr);
	gecko_printf("CPSR: %08x\n", get_cpsr());
	gecko_printf("CR:   %08x\n", get_cr());
	gecko_printf("TTBR: %08x\n", get_ttbr());
	gecko_printf("DACR: %08x\n", get_dacr());

	switch (type) {
		case 3: // INSTR ABORT
		case 4: // DATA ABORT 
			if(type == 3)
				fsr = get_ifsr();
			else
				fsr = get_dfsr();
			gecko_printf("Abort type: %s\n", aborts[fsr&0xf]);
			if(domvalid[fsr&0xf])
				gecko_printf("Domain: %d\n", (fsr>>4)&0xf);
			if(type == 4)
				gecko_printf("Address: 0x%08x\n", get_far());
		break;
		default: break;
	}

	if(type != 3) {
		gecko_printf("Code dump:\n");
		gecko_printf("%08x:  %08x %08x %08x %08x\n", pc-16, read32(pc-16), read32(pc-12), read32(pc-8), read32(pc-4));
		gecko_printf("%08x: *%08x %08x %08x %08x\n", pc, read32(pc), read32(pc+4), read32(pc+8), read32(pc+12));
		gecko_printf("%08x:  %08x %08x %08x %08x\n", pc+16, read32(pc+16), read32(pc+20), read32(pc+24), read32(pc+28));
	}
	panic2(0, PANIC_EXCEPTION);
}