cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

jump_label.h (1009B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ASM_ARM_JUMP_LABEL_H
      3#define _ASM_ARM_JUMP_LABEL_H
      4
      5#ifndef __ASSEMBLY__
      6
      7#include <linux/types.h>
      8#include <asm/unified.h>
      9
     10#define JUMP_LABEL_NOP_SIZE 4
     11
     12static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
     13{
     14	asm_volatile_goto("1:\n\t"
     15		 WASM(nop) "\n\t"
     16		 ".pushsection __jump_table,  \"aw\"\n\t"
     17		 ".word 1b, %l[l_yes], %c0\n\t"
     18		 ".popsection\n\t"
     19		 : :  "i" (&((char *)key)[branch]) :  : l_yes);
     20
     21	return false;
     22l_yes:
     23	return true;
     24}
     25
     26static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
     27{
     28	asm_volatile_goto("1:\n\t"
     29		 WASM(b) " %l[l_yes]\n\t"
     30		 ".pushsection __jump_table,  \"aw\"\n\t"
     31		 ".word 1b, %l[l_yes], %c0\n\t"
     32		 ".popsection\n\t"
     33		 : :  "i" (&((char *)key)[branch]) :  : l_yes);
     34
     35	return false;
     36l_yes:
     37	return true;
     38}
     39
     40typedef u32 jump_label_t;
     41
     42struct jump_entry {
     43	jump_label_t code;
     44	jump_label_t target;
     45	jump_label_t key;
     46};
     47
     48#endif  /* __ASSEMBLY__ */
     49#endif