1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __S390_EXTABLE_H 3 #define __S390_EXTABLE_H 4 /* 5 * The exception table consists of pairs of addresses: the first is the 6 * address of an instruction that is allowed to fault, and the second is 7 * the address at which the program should continue. No registers are 8 * modified, so it is entirely up to the continuation code to figure out 9 * what to do. 10 * 11 * All the routines below use bits of fixup code that are out of line 12 * with the main instruction path. This means when everything is well, 13 * we don't even have to jump over them. Further, they do not intrude 14 * on our cache or tlb entries. 15 */ 16 17 struct exception_table_entry 18 { 19 int insn, fixup; 20 }; 21 22 extern struct exception_table_entry *__start_dma_ex_table; 23 extern struct exception_table_entry *__stop_dma_ex_table; 24 25 const struct exception_table_entry *s390_search_extables(unsigned long addr); 26 27 static inline unsigned long extable_fixup(const struct exception_table_entry *x) 28 { 29 return (unsigned long)&x->fixup + x->fixup; 30 } 31 32 #define ARCH_HAS_RELATIVE_EXTABLE 33 34 #endif 35