bsd-user/signal.c: Only copy the _capsicum for FreeBSD_version > 1400026

The capsicum signal stuff is new with FreeBSD 14, rev 1400026, so only
define QEMU_SI_CAPSICUM there. Only copy _capsicum when QEMU_SI_CAPSICUM
is defined. Default to no info being passed for signals we make no guess
about.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

bsd-user/signal-common.h

@@ -59,12 +59,17 @@ void target_to_host_sigset(sigset_t *d, const target_sigset_t *s);
  * For FreeBSD, we have si_pid, si_uid, si_status, and si_addr always. Linux and
  * {Open,Net}BSD have a different approach (where their reason field is larger,
  * but whose siginfo has fewer fields always).
+ *
+ * QEMU_SI_CAPSICUM is currently only FreeBSD 14 current only, so only define
+ * it where _capsicum is available.
  */
 #define QEMU_SI_NOINFO   0      /* nothing other than si_signo valid */
 #define QEMU_SI_FAULT    1      /* _fault is valid in _reason */
 #define QEMU_SI_TIMER    2      /* _timer is valid in _reason */
 #define QEMU_SI_MESGQ    3      /* _mesgq is valid in _reason */
 #define QEMU_SI_POLL     4      /* _poll is valid in _reason */
+#if defined(__FreeBSD_version) && __FreeBSD_version >= 1400026
 #define QEMU_SI_CAPSICUM 5      /* _capsicum is valid in _reason */
+#endif
 
 #endif

bsd-user/signal.c

@@ -222,6 +222,7 @@ static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
          * We have to go based on the signal number now to figure out
          * what's valid.
          */
+        si_type = QEMU_SI_NOINFO;
         if (has_trapno(sig)) {
             tinfo->_reason._fault._trapno = info->_reason._fault._trapno;
             si_type = QEMU_SI_FAULT;
@@ -241,11 +242,13 @@ static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
          * capsicum is somewhere between weak and non-existant, but if we get
          * one, then we know what to save.
          */
+#ifdef QEMU_SI_CAPSICUM
         if (sig == TARGET_SIGTRAP) {
             tinfo->_reason._capsicum._syscall =
                 info->_reason._capsicum._syscall;
             si_type = QEMU_SI_CAPSICUM;
         }
+#endif
         break;
     }
     tinfo->si_code = deposit32(si_code, 24, 8, si_type);
@@ -295,10 +298,12 @@ static void tswap_siginfo(target_siginfo_t *tinfo, const target_siginfo_t *info)
         /* Note: Not generated on FreeBSD */
         __put_user(info->_reason._poll._band, &tinfo->_reason._poll._band);
         break;
+#ifdef QEMU_SI_CAPSICUM
     case QEMU_SI_CAPSICUM:
         __put_user(info->_reason._capsicum._syscall,
                    &tinfo->_reason._capsicum._syscall);
         break;
+#endif
     default:
         g_assert_not_reached();
     }