patch-2.1.73 linux/arch/mips/kernel/fpe.c

• Lines: 56
• Date: Wed Dec 10 10:31:09 1997
• Orig file: v2.1.72/linux/arch/mips/kernel/fpe.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.72/linux/arch/mips/kernel/fpe.c linux/arch/mips/kernel/fpe.c
@@ -0,0 +1,55 @@
+/*
+ * 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);
+}