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/config.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/a.out.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/system.h>
#include <asm/uaccess.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <asm/machdep.h>
#include <asm/siginfo.h>

/* assembler routines */
asmlinkage void system_call(void);
asmlinkage void buserr(void);
asmlinkage void trap(void);
asmlinkage void inthandler(void);
asmlinkage void nmihandler(void);
#ifdef CONFIG_M68KFPU_EMU
asmlinkage void fpu_emu(void);
#endif

e_vector vectors[256] = {
	[VEC_BUSERR]	= buserr,
	[VEC_ADDRERR]	= trap,
	[VEC_ILLEGAL]	= trap,
	[VEC_ZERODIV]	= trap,
	[VEC_CHK]	= trap,
	[VEC_TRAP]	= trap,
	[VEC_PRIV]	= trap,
	[VEC_TRACE]	= trap,
	[VEC_LINE10]	= trap,
	[VEC_LINE11]	= trap,
	[VEC_RESV12]	= trap,
	[VEC_COPROC]	= trap,
	[VEC_FORMAT]	= trap,
	[VEC_UNINT]	= trap,
	[VEC_RESV16]	= trap,
	[VEC_RESV17]	= trap,
	[VEC_RESV18]	= trap,
	[VEC_RESV19]	= trap,
	[VEC_RESV20]	= trap,
	[VEC_RESV21]	= trap,
	[VEC_RESV22]	= trap,
	[VEC_RESV23]	= trap,
	[VEC_SPUR]	= inthandler,
	[VEC_INT1]	= inthandler,
	[VEC_INT2]	= inthandler,
	[VEC_INT3]	= inthandler,
	[VEC_INT4]	= inthandler,
	[VEC_INT5]	= inthandler,
	[VEC_INT6]	= inthandler,
	[VEC_INT7]	= inthandler,
	[VEC_SYS]	= system_call,
	[VEC_TRAP1]	= trap,
	[VEC_TRAP2]	= trap,
	[VEC_TRAP3]	= trap,
	[VEC_TRAP4]	= trap,
	[VEC_TRAP5]	= trap,
	[VEC_TRAP6]	= trap,
	[VEC_TRAP7]	= trap,
	[VEC_TRAP8]	= trap,
	[VEC_TRAP9]	= trap,
	[VEC_TRAP10]	= trap,
	[VEC_TRAP11]	= trap,
	[VEC_TRAP12]	= trap,
	[VEC_TRAP13]	= trap,
	[VEC_TRAP14]	= trap,
	[VEC_TRAP15]	= trap,
};

/* nmi handler for the Amiga */
asm(".text\n"
    __ALIGN_STR "\n"
    "nmihandler: rte");

/*
 * this must be called very early as the kernel might
 * use some instruction that are emulated on the 060
 */
void __init base_trap_init(void)
{
	if(MACH_IS_SUN3X) {
		extern e_vector *sun3x_prom_vbr;

		__asm__ volatile ("movec %%vbr, %0" : "=r" ((void*)sun3x_prom_vbr));
	}

	/* setup the exception vector table */
	__asm__ volatile ("movec %0,%%vbr" : : "r" ((void*)vectors));

	if (CPU_IS_060) {
		/* set up ISP entry points */
		asmlinkage void unimp_vec(void) asm ("_060_isp_unimp");

		vectors[VEC_UNIMPII] = unimp_vec;
	}
}

void __init trap_init (void)
{
	int i;

	for (i = 48; i < 64; i++)
		if (!vectors[i])
			vectors[i] = trap;

	for (i = 64; i < 256; i++)
		vectors[i] = inthandler;

#ifdef CONFIG_M68KFPU_EMU
	if (FPU_IS_EMU)
		vectors[VEC_LINE11] = fpu_emu;
#endif

	if (CPU_IS_040 && !FPU_IS_EMU) {
		/* set up FPSP entry points */
		asmlinkage void dz_vec(void) asm ("dz");
		asmlinkage void inex_vec(void) asm ("inex");
		asmlinkage void ovfl_vec(void) asm ("ovfl");
		asmlinkage void unfl_vec(void) asm ("unfl");
		asmlinkage void snan_vec(void) asm ("snan");
		asmlinkage void operr_vec(void) asm ("operr");
		asmlinkage void bsun_vec(void) asm ("bsun");
		asmlinkage void fline_vec(void) asm ("fline");
		asmlinkage void unsupp_vec(void) asm ("unsupp");

		vectors[VEC_FPDIVZ] = dz_vec;
		vectors[VEC_FPIR] = inex_vec;
		vectors[VEC_FPOVER] = ovfl_vec;
		vectors[VEC_FPUNDER] = unfl_vec;
		vectors[VEC_FPNAN] = snan_vec;
		vectors[VEC_FPOE] = operr_vec;
		vectors[VEC_FPBRUC] = bsun_vec;
		vectors[VEC_LINE11] = fline_vec;
		vectors[VEC_FPUNSUP] = unsupp_vec;
	}

	if (CPU_IS_060 && !FPU_IS_EMU) {
		/* set up IFPSP entry points */
		asmlinkage void snan_vec6(void) asm ("_060_fpsp_snan");
		asmlinkage void operr_vec6(void) asm ("_060_fpsp_operr");
		asmlinkage void ovfl_vec6(void) asm ("_060_fpsp_ovfl");
		asmlinkage void unfl_vec6(void) asm ("_060_fpsp_unfl");
		asmlinkage void dz_vec6(void) asm ("_060_fpsp_dz");
		asmlinkage void inex_vec6(void) asm ("_060_fpsp_inex");
		asmlinkage void fline_vec6(void) asm ("_060_fpsp_fline");
		asmlinkage