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/*
* The real floating point exception handler. While it doesn't really
* make sense to have this in a module, it makes debugging of this code
* in the kernel space a lot easier. So far this handler in the released
* kernel source is just a dummy.
*
* Copyright (C) 1997 Ralf Baechle
*
* $Id: fpe.c,v 1.1 1997/08/11 04:17:18 ralf Exp $
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <asm/branch.h>
#include <asm/ptrace.h>
MODULE_AUTHOR("Ralf Baechle <ralf@gnu.ai.mit.edu>");
MODULE_DESCRIPTION("Experimental floating point exception handler");
MODULE_SUPPORTED_DEVICE("MIPS FPU");
static void do_fpe(struct pt_regs *regs, unsigned int fcr31)
{
lock_kernel();
#ifdef CONF_DEBUG_EXCEPTIONS
show_regs(regs);
#endif
printk("Caught floating exception at epc == %08lx, fcr31 == %08x\n",
regs->cp0_epc, fcr31);
if (compute_return_epc(regs))
goto out;
force_sig(SIGFPE, current);
out:
unlock_kernel();
}
/*
* For easier experimentation we never increment/decrement
* the module useable counter.
*/
int register_fpe(void (*handler)(struct pt_regs *regs, unsigned int fcr31));
int unregister_fpe(void (*handler)(struct pt_regs *regs, unsigned int fcr31));
int init_module(void)
{
return register_fpe(do_fpe);
}
void cleanup_module(void)
{
unregister_fpe(do_fpe);
}
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