51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
|
// 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");
|
||
|
|
}
|