cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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extable.h (1924B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __S390_EXTABLE_H
      3#define __S390_EXTABLE_H
      4
      5#include <asm/ptrace.h>
      6#include <linux/compiler.h>
      7
      8/*
      9 * The exception table consists of three addresses:
     10 *
     11 * - Address of an instruction that is allowed to fault.
     12 * - Address at which the program should continue.
     13 * - Optional address of handler that takes pt_regs * argument and runs in
     14 *   interrupt context.
     15 *
     16 * No registers are modified, so it is entirely up to the continuation code
     17 * to figure out what to do.
     18 *
     19 * All the routines below use bits of fixup code that are out of line
     20 * with the main instruction path.  This means when everything is well,
     21 * we don't even have to jump over them.  Further, they do not intrude
     22 * on our cache or tlb entries.
     23 */
     24
     25struct exception_table_entry
     26{
     27	int insn, fixup;
     28	short type, data;
     29};
     30
     31extern struct exception_table_entry *__start_amode31_ex_table;
     32extern struct exception_table_entry *__stop_amode31_ex_table;
     33
     34const struct exception_table_entry *s390_search_extables(unsigned long addr);
     35
     36static inline unsigned long extable_fixup(const struct exception_table_entry *x)
     37{
     38	return (unsigned long)&x->fixup + x->fixup;
     39}
     40
     41#define ARCH_HAS_RELATIVE_EXTABLE
     42
     43static inline void swap_ex_entry_fixup(struct exception_table_entry *a,
     44				       struct exception_table_entry *b,
     45				       struct exception_table_entry tmp,
     46				       int delta)
     47{
     48	a->fixup = b->fixup + delta;
     49	b->fixup = tmp.fixup - delta;
     50	a->type = b->type;
     51	b->type = tmp.type;
     52	a->data = b->data;
     53	b->data = tmp.data;
     54}
     55#define swap_ex_entry_fixup swap_ex_entry_fixup
     56
     57#ifdef CONFIG_BPF_JIT
     58
     59bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs);
     60
     61#else /* !CONFIG_BPF_JIT */
     62
     63static inline bool ex_handler_bpf(const struct exception_table_entry *ex, struct pt_regs *regs)
     64{
     65	return false;
     66}
     67
     68#endif /* CONFIG_BPF_JIT */
     69
     70bool fixup_exception(struct pt_regs *regs);
     71
     72#endif