xref: /kvm-unit-tests/lib/powerpc/handlers.c (revision bd238daba9f3e62ac0a835eb969f6f49aaa570c7)

/*
 * Generic exception handlers for registration and use in tests
 *
 * Copyright 2016 Suraj Jitindar Singh, IBM.
 *
 * This work is licensed under the terms of the GNU LGPL, version 2.
 */

#include <libcflat.h>
#include <asm/handlers.h>
#include <asm/ptrace.h>

/*
 * Generic handler for decrementer exceptions (0x900)
 * Just reset the decrementer back to its maximum value (0x7FFFFFFF)
 */
void dec_except_handler(struct pt_regs *regs __unused, void *data __unused)
{
	uint32_t dec = 0x7FFFFFFF;

	asm volatile ("mtdec %0" : : "r" (dec));
}