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// 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");
}
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