/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_RISCV_EXTABLE_H #define _ASM_RISCV_EXTABLE_H /* * The exception table consists of pairs of relative offsets: the first * is the relative offset to an instruction that is allowed to fault, * and the second is the relative offset 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; short type, data; }; #define ARCH_HAS_RELATIVE_EXTABLE #define swap_ex_entry_fixup(a, b, tmp, delta) \ do { \ (a)->fixup = (b)->fixup + (delta); \ (b)->fixup = (tmp).fixup - (delta); \ (a)->type = (b)->type; \ (b)->type = (tmp).type; \ (a)->data = (b)->data; \ (b)->data = (tmp).data; \ } while (0) bool fixup_exception(struct pt_regs *regs); #if defined(CONFIG_BPF_JIT) && defined(CONFIG_ARCH_RV64I) bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs); #else static inline bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs) { return false; } #endif #endif