1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ARCH_POWERPC_EXTABLE_H 3 #define _ARCH_POWERPC_EXTABLE_H 4 5 /* 6 * The exception table consists of pairs of relative addresses: the first is 7 * the address of an instruction that is allowed to fault, and the second is 8 * the address at which the program should continue. No registers are 9 * modified, so it is entirely up to the continuation code to figure out what 10 * to do. 11 * 12 * All the routines below use bits of fixup code that are out of line with the 13 * main instruction path. This means when everything is well, we don't even 14 * have to jump over them. Further, they do not intrude on our cache or tlb 15 * entries. 16 */ 17 18 #define ARCH_HAS_RELATIVE_EXTABLE 19 20 struct exception_table_entry { 21 int insn; 22 int fixup; 23 }; 24 25 static inline unsigned long extable_fixup(const struct exception_table_entry *x) 26 { 27 return (unsigned long)&x->fixup + x->fixup; 28 } 29 30 #endif 31