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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_LIVEPATCH_HELPERS_H
#define _LINUX_LIVEPATCH_HELPERS_H
/*
* Interfaces for use by livepatch patches
*/
#include <linux/syscalls.h>
#include <linux/livepatch.h>
#ifdef MODULE
#define KLP_OBJNAME __KBUILD_MODNAME
#else
#define KLP_OBJNAME vmlinux
#endif
/* Livepatch callback registration */
#define KLP_CALLBACK_PTRS ".discard.klp_callback_ptrs"
#define KLP_PRE_PATCH_CALLBACK(func) \
klp_pre_patch_t __used __section(KLP_CALLBACK_PTRS) \
__PASTE(__KLP_PRE_PATCH_PREFIX, KLP_OBJNAME) = func
#define KLP_POST_PATCH_CALLBACK(func) \
klp_post_patch_t __used __section(KLP_CALLBACK_PTRS) \
__PASTE(__KLP_POST_PATCH_PREFIX, KLP_OBJNAME) = func
#define KLP_PRE_UNPATCH_CALLBACK(func) \
klp_pre_unpatch_t __used __section(KLP_CALLBACK_PTRS) \
__PASTE(__KLP_PRE_UNPATCH_PREFIX, KLP_OBJNAME) = func
#define KLP_POST_UNPATCH_CALLBACK(func) \
klp_post_unpatch_t __used __section(KLP_CALLBACK_PTRS) \
__PASTE(__KLP_POST_UNPATCH_PREFIX, KLP_OBJNAME) = func
/*
* Replace static_call() usage with this macro when create-diff-object
* recommends it due to the original static call key living in a module.
*
* This converts the static call to a regular indirect call.
*/
#define KLP_STATIC_CALL(name) \
((typeof(STATIC_CALL_TRAMP(name))*)(STATIC_CALL_KEY(name).func))
/* Syscall patching */
#define KLP_SYSCALL_DEFINE1(name, ...) KLP_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
#define KLP_SYSCALL_DEFINE2(name, ...) KLP_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
#define KLP_SYSCALL_DEFINE3(name, ...) KLP_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
#define KLP_SYSCALL_DEFINE4(name, ...) KLP_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
#define KLP_SYSCALL_DEFINE5(name, ...) KLP_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
#define KLP_SYSCALL_DEFINE6(name, ...) KLP_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
#define KLP_SYSCALL_DEFINEx(x, sname, ...) \
__KLP_SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
#ifdef CONFIG_X86_64
// TODO move this to arch/x86/include/asm/syscall_wrapper.h and share code
#define __KLP_SYSCALL_DEFINEx(x, name, ...) \
static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
static inline long __klp_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
__X64_SYS_STUBx(x, name, __VA_ARGS__) \
__IA32_SYS_STUBx(x, name, __VA_ARGS__) \
static long __se_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \
{ \
long ret = __klp_do_sys##name(__MAP(x,__SC_CAST,__VA_ARGS__));\
__MAP(x,__SC_TEST,__VA_ARGS__); \
__PROTECT(x, ret,__MAP(x,__SC_ARGS,__VA_ARGS__)); \
return ret; \
} \
static inline long __klp_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#endif
#endif /* _LINUX_LIVEPATCH_HELPERS_H */
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