1 files changed, 121 insertions, 0 deletions
diff --git a/arch/x86/include/asm/linkage.h b/arch/x86/include/asm/linkage.h
new file mode 100644
index 00000000000..5d98d0b68ff
--- /dev/null
+++ b/arch/x86/include/asm/linkage.h
@@ -0,0 +1,121 @@
+#ifndef _ASM_X86_LINKAGE_H
+#define _ASM_X86_LINKAGE_H
+
+#undef notrace
+#define notrace __attribute__((no_instrument_function))
+
+#ifdef CONFIG_X86_64
+#define __ALIGN .p2align 4,,15
+#define __ALIGN_STR ".p2align 4,,15"
+#endif
+
+#ifdef CONFIG_X86_32
+#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
+/*
+ * For 32-bit UML - mark functions implemented in assembly that use
+ * regparm input parameters:
+ */
+#define asmregparm __attribute__((regparm(3)))
+
+/*
+ * Make sure the compiler doesn't do anything stupid with the
+ * arguments on the stack - they are owned by the *caller*, not
+ * the callee. This just fools gcc into not spilling into them,
+ * and keeps it from doing tailcall recursion and/or using the
+ * stack slots for temporaries, since they are live and "used"
+ * all the way to the end of the function.
+ *
+ * NOTE! On x86-64, all the arguments are in registers, so this
+ * only matters on a 32-bit kernel.
+ */
+#define asmlinkage_protect(n, ret, args...) \
+	__asmlinkage_protect##n(ret, ##args)
+#define __asmlinkage_protect_n(ret, args...) \
+	__asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
+#define __asmlinkage_protect0(ret) \
+	__asmlinkage_protect_n(ret)
+#define __asmlinkage_protect1(ret, arg1) \
+	__asmlinkage_protect_n(ret, "g" (arg1))
+#define __asmlinkage_protect2(ret, arg1, arg2) \
+	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2))
+#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
+	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3))
+#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
+	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
+			      "g" (arg4))
+#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
+	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
+			      "g" (arg4), "g" (arg5))
+#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
+	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
+			      "g" (arg4), "g" (arg5), "g" (arg6))
+
+#endif
+
+#ifdef CONFIG_X86_ALIGNMENT_16
+#define __ALIGN .align 16,0x90
+#define __ALIGN_STR ".align 16,0x90"
+#endif
+
+/*
+ * to check ENTRY_X86/END_X86 and
+ * KPROBE_ENTRY_X86/KPROBE_END_X86
+ * unbalanced-missed-mixed appearance
+ */
+#define __set_entry_x86		.set ENTRY_X86_IN, 0
+#define __unset_entry_x86	.set ENTRY_X86_IN, 1
+#define __set_kprobe_x86	.set KPROBE_X86_IN, 0
+#define __unset_kprobe_x86	.set KPROBE_X86_IN, 1
+
+#define __macro_err_x86 .error "ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed"
+
+#define __check_entry_x86	\
+	.ifdef ENTRY_X86_IN;	\
+	.ifeq ENTRY_X86_IN;	\
+	__macro_err_x86;	\
+	.abort;			\
+	.endif;			\
+	.endif
+
+#define __check_kprobe_x86	\
+	.ifdef KPROBE_X86_IN;	\
+	.ifeq KPROBE_X86_IN;	\
+	__macro_err_x86;	\
+	.abort;			\
+	.endif;			\
+	.endif
+
+#define __check_entry_kprobe_x86	\
+	__check_entry_x86;		\
+	__check_kprobe_x86
+
+#define ENTRY_KPROBE_FINAL_X86 __check_entry_kprobe_x86
+
+#define ENTRY_X86(name)			\
+	__check_entry_kprobe_x86;	\
+	__set_entry_x86;		\
+	.globl name;			\
+	__ALIGN;			\
+	name:
+
+#define END_X86(name)			\
+	__unset_entry_x86;		\
+	__check_entry_kprobe_x86;	\
+	.size name, .-name
+
+#define KPROBE_ENTRY_X86(name)		\
+	__check_entry_kprobe_x86;	\
+	__set_kprobe_x86;		\
+	.pushsection .kprobes.text, "ax"; \
+	.globl name;			\
+	__ALIGN;			\
+	name:
+
+#define KPROBE_END_X86(name)		\
+	__unset_kprobe_x86;		\
+	__check_entry_kprobe_x86;	\
+	.size name, .-name;		\
+	.popsection
+
+#endif /* _ASM_X86_LINKAGE_H */
+