| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ARCH_POWERPC_EXTABLE_H |
| #define _ARCH_POWERPC_EXTABLE_H |
| |
| /* |
| * The exception table consists of pairs of relative 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. |
| */ |
| |
| #define ARCH_HAS_RELATIVE_EXTABLE |
| |
| #ifndef __ASSEMBLY__ |
| |
| struct exception_table_entry { |
| int insn; |
| int fixup; |
| }; |
| |
| static inline unsigned long extable_fixup(const struct exception_table_entry *x) |
| { |
| return (unsigned long)&x->fixup + x->fixup; |
| } |
| |
| #endif |
| |
| /* |
| * Helper macro for exception table entries |
| */ |
| #define EX_TABLE(_fault, _target) \ |
| stringify_in_c(.section __ex_table,"a";)\ |
| stringify_in_c(.balign 4;) \ |
| stringify_in_c(.long (_fault) - . ;) \ |
| stringify_in_c(.long (_target) - . ;) \ |
| stringify_in_c(.previous) |
| |
| #endif |
