1 /* 2 * Generic exception handlers for registration and use in tests 3 * 4 * Copyright 2016 Suraj Jitindar Singh, IBM. 5 * 6 * This work is licensed under the terms of the GNU LGPL, version 2. 7 */ 8 9 #include <libcflat.h> 10 #include <asm/handlers.h> 11 #include <asm/ptrace.h> 12 13 /* 14 * Generic handler for decrementer exceptions (0x900) 15 * Just reset the decrementer back to the value specified when registering the 16 * handler 17 */ 18 void dec_except_handler(struct pt_regs *regs __unused, void *data) 19 { 20 uint64_t dec = *((uint64_t *) data); 21 22 asm volatile ("mtdec %0" : : "r" (dec)); 23 } 24