1 files changed, 15 insertions, 0 deletions
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 34af15a683..124754f8bd 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -673,6 +673,21 @@ typedef struct {
 
 #define TARGET_SI_PAD_SIZE ((TARGET_SI_MAX_SIZE - TARGET_SI_PREAMBLE_SIZE) / sizeof(int))
 
+/* Within QEMU the top 16 bits of si_code indicate which of the parts of
+ * the union in target_siginfo is valid. This only applies between
+ * host_to_target_siginfo_noswap() and tswap_siginfo(); it does not
+ * appear either within host siginfo_t or in target_siginfo structures
+ * which we get from the guest userspace program. (The Linux kernel
+ * does a similar thing with using the top bits for its own internal
+ * purposes but not letting them be visible to userspace.)
+ */
+#define QEMU_SI_KILL 0
+#define QEMU_SI_TIMER 1
+#define QEMU_SI_POLL 2
+#define QEMU_SI_FAULT 3
+#define QEMU_SI_CHLD 4
+#define QEMU_SI_RT 5
+
 typedef struct target_siginfo {
 #ifdef TARGET_MIPS
 	int si_signo;