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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jump_label.h (1571B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (c) 2010 Cavium Networks, Inc.
      7 */
      8#ifndef _ASM_MIPS_JUMP_LABEL_H
      9#define _ASM_MIPS_JUMP_LABEL_H
     10
     11#ifndef __ASSEMBLY__
     12
     13#include <linux/types.h>
     14#include <asm/isa-rev.h>
     15
     16#define JUMP_LABEL_NOP_SIZE 4
     17
     18#ifdef CONFIG_64BIT
     19#define WORD_INSN ".dword"
     20#else
     21#define WORD_INSN ".word"
     22#endif
     23
     24#ifdef CONFIG_CPU_MICROMIPS
     25# define B_INSN "b32"
     26# define J_INSN "j32"
     27#elif MIPS_ISA_REV >= 6
     28# define B_INSN "bc"
     29# define J_INSN "bc"
     30#else
     31# define B_INSN "b"
     32# define J_INSN "j"
     33#endif
     34
     35static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
     36{
     37	asm_volatile_goto("1:\t" B_INSN " 2f\n\t"
     38		"2:\t.insn\n\t"
     39		".pushsection __jump_table,  \"aw\"\n\t"
     40		WORD_INSN " 1b, %l[l_yes], %0\n\t"
     41		".popsection\n\t"
     42		: :  "i" (&((char *)key)[branch]) : : l_yes);
     43
     44	return false;
     45l_yes:
     46	return true;
     47}
     48
     49static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
     50{
     51	asm_volatile_goto("1:\t" J_INSN " %l[l_yes]\n\t"
     52		".pushsection __jump_table,  \"aw\"\n\t"
     53		WORD_INSN " 1b, %l[l_yes], %0\n\t"
     54		".popsection\n\t"
     55		: :  "i" (&((char *)key)[branch]) : : l_yes);
     56
     57	return false;
     58l_yes:
     59	return true;
     60}
     61
     62#ifdef CONFIG_64BIT
     63typedef u64 jump_label_t;
     64#else
     65typedef u32 jump_label_t;
     66#endif
     67
     68struct jump_entry {
     69	jump_label_t code;
     70	jump_label_t target;
     71	jump_label_t key;
     72};
     73
     74#endif  /* __ASSEMBLY__ */
     75#endif /* _ASM_MIPS_JUMP_LABEL_H */