x86: support hooking SYSCALL/SYSENTER instructions. we no longer share the SYSCALL callback with interrupt instructions

include/unicorn/unicorn.h

@@ -19,6 +19,9 @@ extern "C" {
 
 #include "platform.h"
 
+// Handle to use with all APIs
+typedef size_t uch;
+
 #include "m68k.h"
 #include "x86.h"
 #include "arm.h"
@@ -65,9 +68,6 @@ extern "C" {
 // 1 milisecond = 1000 nanoseconds
 #define UC_MILISECOND_SCALE 1000
 
-// Handle using with all API
-typedef size_t uch;
-
 // Architecture type
 typedef enum uc_arch {
     UC_ARCH_ARM = 1,    // ARM architecture (including Thumb, Thumb-2)

include/unicorn/x86.h

@@ -8,6 +8,10 @@
 extern "C" {
 #endif
 
+// Callback function for tracing SYSCALL/SYSENTER (for uc_hook_intr())
+// @user_data: user data passed to tracing APIs.
+typedef void (*uc_cb_insn_syscall_t)(uch handle, void *user_data);
+
 //> X86 registers
 typedef enum x86_reg {
 	X86_REG_INVALID = 0,