[RFC PATCH 2/3] early kprobes: x86: add definition for vmlinux.lds use.

[Wang Nan]

This patch defines MAX_OPTINSN_SIZE, MAX_INSN_SIZE and
KPROBE_OPCODE_SIZE for x86 for vmlinux.lds.S use.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
---
 arch/x86/kernel/vmlinux.lds.S | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 00bf300..e46d877 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -29,6 +29,16 @@
 
 #undef i386     /* in case the preprocessor is a 32bit one */
 
+#ifdef CONFIG_EARLY_KPROBES
+# define MAX_INSN_SIZE 16
+# define RELATIVE_ADDR_SIZE 4
+# define RELATIVEJUMP_SIZE 5
+# define KPROBE_OPCODE_SIZE 1
+# define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE)
+# define MAX_OPTINSN_SIZE ((optprobe_template_end - optprobe_template_entry) + \
+	MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE)
+#endif
+
 OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
 
 #ifdef CONFIG_X86_32
-- 
1.8.4

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