| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __S390_EXTABLE_H |
| #define __S390_EXTABLE_H |
| /* |
| * The exception table consists of pairs of addresses: the first is the |
| * address of an instruction that is allowed to fault, and the second is |
| * the address at which the program should continue. No registers are |
| * modified, so it is entirely up to the continuation code to figure out |
| * what to do. |
| * |
| * All the routines below use bits of fixup code that are out of line |
| * with the main instruction path. This means when everything is well, |
| * we don't even have to jump over them. Further, they do not intrude |
| * on our cache or tlb entries. |
| */ |
| |
| struct exception_table_entry |
| { |
| int insn, fixup; |
| }; |
| |
| extern struct exception_table_entry *__start_dma_ex_table; |
| extern struct exception_table_entry *__stop_dma_ex_table; |
| |
| const struct exception_table_entry *s390_search_extables(unsigned long addr); |
| |
| static inline unsigned long extable_fixup(const struct exception_table_entry *x) |
| { |
| return (unsigned long)&x->fixup + x->fixup; |
| } |
| |
| #define ARCH_HAS_RELATIVE_EXTABLE |
| |
| #endif |
