[v6,20/22] instrument: Add event 'guest_user_syscall'

diff --git a/bsd-user/syscall.c b/bsd-user/syscall.c
index 3230f722f3..0d92eaf8c4 100644
--- a/bsd-user/syscall.c
+++ b/bsd-user/syscall.c
@@ -324,6 +324,8 @@  abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
 #ifdef DEBUG
     gemu_log("freebsd syscall %d\n", num);
 #endif
+    instr_guest_user_syscall(cpu, num,
+                             arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
     trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
     if(do_strace)
         print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
@@ -423,6 +425,8 @@  abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 #ifdef DEBUG
     gemu_log("netbsd syscall %d\n", num);
 #endif
+    instr_guest_user_syscall(cpu, num,
+                             arg1, arg2, arg3, arg4, arg5, arg6, 0, 0);
     trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 0, 0);
     if(do_strace)
         print_netbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
@@ -499,6 +503,8 @@  abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
 #ifdef DEBUG
     gemu_log("openbsd syscall %d\n", num);
 #endif
+    instr_guest_user_syscall(cpu, num,
+                             arg1, arg2, arg3, arg4, arg5, arg6, 0, 0);
     trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 0, 0);
     if(do_strace)
         print_openbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
diff --git a/instrument/control.c b/instrument/control.c
index 3fcacb2853..45efeef7ac 100644
--- a/instrument/control.c
+++ b/instrument/control.c
@@ -193,3 +193,21 @@  SYM_PUBLIC void qi_event_set_guest_mem_before_exec(
     ERROR_IF(!tcg_enabled(), "called without TCG");
     instr_set_event(guest_mem_before_exec, fn);
 }
+
+
+void (*instr_event__guest_user_syscall)(
+    QICPU vcpu, uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3,
+    uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8);
+
+SYM_PUBLIC void qi_event_set_guest_user_syscall(
+    void (*fn)(QICPU vcpu, uint64_t num, uint64_t arg1, uint64_t arg2,
+               uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6,
+               uint64_t arg7, uint64_t arg8))
+{
+    ERROR_IF(!instr_get_state(), "called outside instrumentation");
+    ERROR_IF(!tcg_enabled(), "called without TCG");
+#if !defined(CONFIG_USER_ONLY)
+    ERROR_IF(true, "called in full-system mode");
+#endif
+    instr_set_event(guest_user_syscall, fn);
+}
diff --git a/instrument/events.h b/instrument/events.h
index 6507b26867..8c944e1f91 100644
--- a/instrument/events.h
+++ b/instrument/events.h
@@ -68,6 +68,13 @@  extern void (*instr_event__guest_mem_before_exec)(
 static inline void instr_guest_mem_before_exec(
     CPUState *vcpu, uint64_t vaddr, TraceMemInfo info);
 
+extern void (*instr_event__guest_user_syscall)(
+    QICPU vcpu, uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3,
+    uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8);
+static inline void instr_guest_user_syscall(
+    CPUState *vcpu, uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3,
+    uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8);
+
 
 #include "instrument/events.inc.h"
 
diff --git a/instrument/events.inc.h b/instrument/events.inc.h
index ebc8020715..e2f4315fb0 100644
--- a/instrument/events.inc.h
+++ b/instrument/events.inc.h
@@ -78,3 +78,19 @@  static inline void instr_guest_mem_before_exec(
         instr_set_state(INSTR_STATE_DISABLE);
     }
 }
+
+static inline void instr_guest_user_syscall(
+    CPUState *vcpu, uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3,
+    uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8)
+{
+    void (*cb)(QICPU vcpu, uint64_t num, uint64_t arg1, uint64_t arg2,
+               uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6,
+               uint64_t arg7, uint64_t arg8)
+        = instr_get_event(guest_user_syscall);
+    if (cb) {
+        instr_set_state(INSTR_STATE_ENABLE);
+        QICPU vcpu_ = instr_cpu_to_qicpu(vcpu);
+        (*cb)(vcpu_, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
+        instr_set_state(INSTR_STATE_DISABLE);
+    }
+}
diff --git a/instrument/load.c b/instrument/load.c
index f1d769b92d..a76f76e1d1 100644
--- a/instrument/load.c
+++ b/instrument/load.c
@@ -164,6 +164,7 @@  InstrUnloadError instr_unload(const char *id)
     instr_set_event(guest_cpu_reset, NULL);
     instr_set_event(guest_mem_before_trans, NULL);
     instr_set_event(guest_mem_before_exec, NULL);
+    instr_set_event(guest_user_syscall, NULL);
 
     instr_cpu_stop_all_end(&info);
     cpu_list_unlock();
diff --git a/instrument/qemu-instr/control.h b/instrument/qemu-instr/control.h
index acd4b10f03..136058af4f 100644
--- a/instrument/qemu-instr/control.h
+++ b/instrument/qemu-instr/control.h
@@ -142,6 +142,21 @@  void qi_event_gen_guest_mem_before_exec(
 void qi_event_set_guest_mem_before_exec(
     void (*fn)(QICPU vcpu, uint64_t vaddr, QIMemInfo info));
 
+/*
+ * Start executing a guest system call in syscall emulation mode.
+ *
+ * @num: System call number.
+ * @arg*: System call argument value.
+ *
+ * Mode: user
+ * Targets: TCG(all)
+ * Time: exec
+ */
+void qi_event_set_guest_user_syscall(
+    void (*fn)(QICPU vcpu, uint64_t num, uint64_t arg1, uint64_t arg2,
+               uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6,
+               uint64_t arg7, uint64_t arg8));
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index e73a07fa6f..c9f0b9fa56 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7723,6 +7723,8 @@  abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #ifdef DEBUG
     gemu_log("syscall %d", num);
 #endif
+    instr_guest_user_syscall(cpu, num,
+                             arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
     trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
     if(do_strace)
         print_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
diff --git a/stubs/instrument.c b/stubs/instrument.c
index 640c91f470..bb585c69ce 100644
--- a/stubs/instrument.c
+++ b/stubs/instrument.c
@@ -66,3 +66,6 @@  void helper_instr_guest_mem_before_exec(
 void (*instr_event__guest_mem_before_exec)(
     QICPU vcpu_trans, QITCGv_cpu vcpu_exec,
     QITCGv vaddr, QIMemInfo info);
+void (*instr_event__guest_user_syscall)(
+    QICPU vcpu, uint64_t num, uint64_t arg1, uint64_t arg2, uint64_t arg3,
+    uint64_t arg4, uint64_t arg5, uint64_t arg6, uint64_t arg7, uint64_t arg8);