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

static_call_types.h (2809B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _STATIC_CALL_TYPES_H
      3#define _STATIC_CALL_TYPES_H
      4
      5#include <linux/types.h>
      6#include <linux/stringify.h>
      7#include <linux/compiler.h>
      8
      9#define STATIC_CALL_KEY_PREFIX		__SCK__
     10#define STATIC_CALL_KEY_PREFIX_STR	__stringify(STATIC_CALL_KEY_PREFIX)
     11#define STATIC_CALL_KEY_PREFIX_LEN	(sizeof(STATIC_CALL_KEY_PREFIX_STR) - 1)
     12#define STATIC_CALL_KEY(name)		__PASTE(STATIC_CALL_KEY_PREFIX, name)
     13#define STATIC_CALL_KEY_STR(name)	__stringify(STATIC_CALL_KEY(name))
     14
     15#define STATIC_CALL_TRAMP_PREFIX	__SCT__
     16#define STATIC_CALL_TRAMP_PREFIX_STR	__stringify(STATIC_CALL_TRAMP_PREFIX)
     17#define STATIC_CALL_TRAMP_PREFIX_LEN	(sizeof(STATIC_CALL_TRAMP_PREFIX_STR) - 1)
     18#define STATIC_CALL_TRAMP(name)		__PASTE(STATIC_CALL_TRAMP_PREFIX, name)
     19#define STATIC_CALL_TRAMP_STR(name)	__stringify(STATIC_CALL_TRAMP(name))
     20
     21/*
     22 * Flags in the low bits of static_call_site::key.
     23 */
     24#define STATIC_CALL_SITE_TAIL 1UL	/* tail call */
     25#define STATIC_CALL_SITE_INIT 2UL	/* init section */
     26#define STATIC_CALL_SITE_FLAGS 3UL
     27
     28/*
     29 * The static call site table needs to be created by external tooling (objtool
     30 * or a compiler plugin).
     31 */
     32struct static_call_site {
     33	s32 addr;
     34	s32 key;
     35};
     36
     37#define DECLARE_STATIC_CALL(name, func)					\
     38	extern struct static_call_key STATIC_CALL_KEY(name);		\
     39	extern typeof(func) STATIC_CALL_TRAMP(name);
     40
     41#ifdef CONFIG_HAVE_STATIC_CALL
     42
     43#define __raw_static_call(name)	(&STATIC_CALL_TRAMP(name))
     44
     45#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
     46
     47/*
     48 * __ADDRESSABLE() is used to ensure the key symbol doesn't get stripped from
     49 * the symbol table so that objtool can reference it when it generates the
     50 * .static_call_sites section.
     51 */
     52#define __STATIC_CALL_ADDRESSABLE(name) \
     53	__ADDRESSABLE(STATIC_CALL_KEY(name))
     54
     55#define __static_call(name)						\
     56({									\
     57	__STATIC_CALL_ADDRESSABLE(name);				\
     58	__raw_static_call(name);					\
     59})
     60
     61struct static_call_key {
     62	void *func;
     63	union {
     64		/* bit 0: 0 = mods, 1 = sites */
     65		unsigned long type;
     66		struct static_call_mod *mods;
     67		struct static_call_site *sites;
     68	};
     69};
     70
     71#else /* !CONFIG_HAVE_STATIC_CALL_INLINE */
     72
     73#define __STATIC_CALL_ADDRESSABLE(name)
     74#define __static_call(name)	__raw_static_call(name)
     75
     76struct static_call_key {
     77	void *func;
     78};
     79
     80#endif /* CONFIG_HAVE_STATIC_CALL_INLINE */
     81
     82#ifdef MODULE
     83#define __STATIC_CALL_MOD_ADDRESSABLE(name)
     84#define static_call_mod(name)	__raw_static_call(name)
     85#else
     86#define __STATIC_CALL_MOD_ADDRESSABLE(name) __STATIC_CALL_ADDRESSABLE(name)
     87#define static_call_mod(name)	__static_call(name)
     88#endif
     89
     90#define static_call(name)	__static_call(name)
     91
     92#else
     93
     94struct static_call_key {
     95	void *func;
     96};
     97
     98#define static_call(name)						\
     99	((typeof(STATIC_CALL_TRAMP(name))*)(STATIC_CALL_KEY(name).func))
    100
    101#endif /* CONFIG_HAVE_STATIC_CALL */
    102
    103#endif /* _STATIC_CALL_TYPES_H */