path: root/arch/m68k/kernel/traps.c

/*
 *  linux/arch/m68k/kernel/traps.c
 *
 *  Copyright (C) 1993, 1994 by Hamish Macdonald
 *
 *  68040 fixes by Michael Rausch
 *  68040 fixes by Martin Apel
 *  68040 fixes and writeback by Richard Zidlicky
 *  68060 fixes by Roman Hodek
 *  68060 fixes by Jesper Skov
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * Sets up all exception vectors
 */

#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/user.h>
#include <linux/string.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.h>

#include <asm/setup.h>
#include <asm/fpu.h>
#include <asm/uaccess.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <asm/machdep.h>
#include <asm/siginfo.h>


static const char *vec_names[] = {
	[VEC_RESETSP]	= "RESET SP",
	[VEC_RESETPC]	= "RESET PC",
	[VEC_BUSERR]	= "BUS ERROR",
	[VEC_ADDRERR]	= "ADDRESS ERROR",
	[VEC_ILLEGAL]	= "ILLEGAL INSTRUCTION",
	[VEC_ZERODIV]	= "ZERO DIVIDE",
	[VEC_CHK]	= "CHK",
	[VEC_TRAP]	= "TRAPcc",
	[VEC_PRIV]	= "PRIVILEGE VIOLATION",
	[VEC_TRACE]	= "TRACE",
	[VEC_LINE10]	= "LINE 1010",
	[VEC_LINE11]	= "LINE 1111",
	[VEC_RESV12]	= "UNASSIGNED RESERVED 12",
	[VEC_COPROC]	= "COPROCESSOR PROTOCOL VIOLATION",
	[VEC_FORMAT]	= "FORMAT ERROR",
	[VEC_UNINT]	= "UNINITIALIZED INTERRUPT",
	[VEC_RESV16]	= "UNASSIGNED RESERVED 16",
	[VEC_RESV17]	= "UNASSIGNED RESERVED 17",
	[VEC_RESV18]	= "UNASSIGNED RESERVED 18",
	[VEC_RESV19]	= "UNASSIGNED RESERVED 19",
	[VEC_RESV20]	= "UNASSIGNED RESERVED 20",
	[VEC_RESV21]	= "UNASSIGNED RESERVED 21",
	[VEC_RESV22]	= "UNASSIGNED RESERVED 22",
	[VEC_RESV23]	= "UNASSIGNED RESERVED 23",
	[VEC_SPUR]	= "SPURIOUS INTERRUPT",
	[VEC_INT1]	= "LEVEL 1 INT",
	[VEC_INT2]	= "LEVEL 2 INT",
	[VEC_INT3]	= "LEVEL 3 INT",
	[VEC_INT4]	= "LEVEL 4 INT",
	[VEC_INT5]	= "LEVEL 5 INT",
	[VEC_INT6]	= "LEVEL 6 INT",
	[VEC_INT7]	= "LEVEL 7 INT",
	[VEC_SYS]	= "SYSCALL",
	[VEC_TRAP1]	= "TRAP #1",
	[VEC_TRAP2]	= "TRAP #2",
	[VEC_TRAP3]	= "TRAP #3",
	[VEC_TRAP4]	= "TRAP #4",
	[VEC_TRAP5]	= "TRAP #5",
	[VEC_TRAP6]	= "TRAP #6",
	[VEC_TRAP7]	= "TRAP #7",
	[VEC_TRAP8]	= "TRAP #8",
	[VEC_TRAP9]	= "TRAP #9",
	[VEC_TRAP10]	= "TRAP #10",
	[VEC_TRAP11]	= "TRAP #11",
	[VEC_TRAP12]	= "TRAP #12",
	[VEC_TRAP13]	= "TRAP #13",
	[VEC_TRAP14]	= "TRAP #14",
	[VEC_TRAP15]	= "TRAP #15",
	[VEC_FPBRUC]	= "FPCP BSUN",
	[VEC_FPIR]	= "FPCP INEXACT",
	[VEC_FPDIVZ]	= "FPCP DIV BY 0",
	[VEC_FPUNDER]	= "FPCP UNDERFLOW",
	[VEC_FPOE]	= "FPCP OPERAND ERROR",
	[VEC_FPOVER]	= "FPCP OVERFLOW",
	[VEC_FPNAN]	= "FPCP SNAN",
	[VEC_FPUNSUP]	= "FPCP UNSUPPORTED OPERATION",
	[VEC_MMUCFG]	= "MMU CONFIGURATION ERROR",
	[VEC_MMUILL]	= "MMU ILLEGAL OPERATION ERROR",
	[VEC_MMUACC]	= "MMU ACCESS LEVEL VIOLATION ERROR",
	[VEC_RESV59]	= "UNASSIGNED RESERVED 59",
	[VEC_UNIMPEA]	= "UNASSIGNED RESERVED 60",
	[VEC_UNIMPII]	= "UNASSIGNED RESERVED 61",
	[VEC_RESV62]	= "UNASSIGNED RESERVED 62",
	[VEC_RESV63]	= "UNASSIGNED RESERVED 63",
};

static const char *space_names[] = {
	[0]		= "Space 0",
	[USER_DATA]	= "User Data",
	[USER_PROGRAM]	= "User Program",
#ifndef CONFIG_SUN3
	[3]		= "Space 3",
#else
	[FC_CONTROL]	= "Control",
#endif
	[4]		= "Space 4",
	[SUPER_DATA]	= "Super Data",
	[SUPER_PROGRAM]	= "Super Program",
	[CPU_SPACE]	= "CPU"
};

void die_if_kernel(char *,struct pt_regs *,int);
asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address,
                             unsigned long error_code);
int send_fault_sig(struct pt_regs *regs);

asmlinkage void trap_c(struct frame *fp);

#if defined (CONFIG_M68060)
static inline void access_error060 (struct frame *fp)
{
	unsigned long fslw = fp->un.fmt4.pc; /* is really FSLW for access error */

#ifdef DEBUG
	printk("fslw=%#lx, fa=%#lx\n", fslw, fp->un.fmt4.effaddr);
#endif

	if (fslw & MMU060_BPE) {
		/* branch prediction error -> clear branch cache */
		__asm__ __volatile__ ("movec %/cacr,%/d0\n\t"
				      "orl   #0x00400000,%/d0\n\t"
				      "movec %/d0,%/cacr"
				      : : : "d0" );
		/* return if there's no other error */
		if (!(fslw & MMU060_ERR_BITS) && !(fslw & MMU060_SEE))
			return;
	}

	if (fslw & (MMU060_DESC_ERR | MMU060_WP | MMU060_SP)) {
		unsigned long errorcode;
		unsigned long addr = fp->un.fmt4.effaddr;

		if (fslw & MMU060_MA)
			addr = (addr + PAGE_SIZE - 1) & PAGE_MASK;

		errorcode = 1;
		if (fslw & MMU060_DESC_ERR) {
			__flush_tlb040_one(addr);
			errorcode = 0;
		}
		if (fslw & MMU060_W)
			errorcode |= 2;
#ifdef DEBUG
		printk("errorcode = %d\n", errorcode );
#endif
		do_page_fault(&fp->ptregs, addr, errorcode);
	} else if (fslw