// SPDX-License-Identifier: GPL-2.0 #include <linux/extable.h> #include <linux/errno.h> #include <linux/panic.h> #include <asm/asm-extable.h> #include <asm/extable.h> const struct exception_table_entry *s390_search_extables(unsigned long addr) { const struct exception_table_entry *fixup; size_t num; fixup = search_exception_tables(addr); if (fixup) return fixup; num = __stop_amode31_ex_table - __start_amode31_ex_table; return search_extable(__start_amode31_ex_table, num, addr); } static bool ex_handler_fixup(const struct exception_table_entry *ex, struct pt_regs *regs) { regs->psw.addr = extable_fixup(ex); return true; } static bool ex_handler_uaccess(const struct exception_table_entry *ex, struct pt_regs *regs) { regs->gprs[ex->data] = -EFAULT; regs->psw.addr = extable_fixup(ex); return true; } bool fixup_exception(struct pt_regs *regs) { const struct exception_table_entry *ex; ex = s390_search_extables(instruction_pointer(regs)); if (!ex) return false; switch (ex->type) { case EX_TYPE_FIXUP: return ex_handler_fixup(ex, regs); case EX_TYPE_BPF: return ex_handler_bpf(ex, regs); case EX_TYPE_UACCESS: return ex_handler_uaccess(ex, regs); } panic("invalid exception table entry"); }