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