linux-user/alpha: Set TRAP_UNK for bugchk and unknown gentrap

These si_codes were changed in 535906c684fca, for linux 4.17.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220107213243.212806-2-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/alpha/cpu_loop.c

@@ -86,7 +86,7 @@ void cpu_loop(CPUAlphaState *env)
                 /* BUGCHK */
                 info.si_signo = TARGET_SIGTRAP;
                 info.si_errno = 0;
-                info.si_code = 0;
+                info.si_code = TARGET_TRAP_UNK;
                 info._sifields._sigfault._addr = env->pc;
                 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                 break;
@@ -155,7 +155,7 @@ void cpu_loop(CPUAlphaState *env)
                     break;
                 default:
                     info.si_signo = TARGET_SIGTRAP;
-                    info.si_code = 0;
+                    info.si_code = TARGET_TRAP_UNK;
                     break;
                 }
                 info.si_errno = 0;

linux-user/syscall_defs.h

@@ -715,6 +715,7 @@ typedef struct target_siginfo {
 #define TARGET_TRAP_TRACE	(2)	/* process trace trap */
 #define TARGET_TRAP_BRANCH      (3)     /* process taken branch trap */
 #define TARGET_TRAP_HWBKPT      (4)     /* hardware breakpoint/watchpoint */
+#define TARGET_TRAP_UNK         (5)     /* undiagnosed trap */
 
 struct target_rlimit {
         abi_ulong   rlim_cur;