xnu-792.18.15.tar.gz

[apple/xnu.git] / bsd / dev / ppc / unix_signal.c

diff --git a/bsd/dev/ppc/unix_signal.c b/bsd/dev/ppc/unix_signal.c
index 2c2244493f8d90e28f1775d22738801e51bbf339..f6bbfa6ac689c9c529b53ddfe3829362fd6b36cb 100644 (file)
--- a/bsd/dev/ppc/unix_signal.c
+++ b/bsd/dev/ppc/unix_signal.c
@@ -202,8 +202,11 @@ sendsig(struct proc *p, user_addr_t catcher, int sig, int mask, __unused u_long
        int stack_size = 0;
        void * tstate;
        int flavor;
-        int ctx32 = 1;
-
+       int ctx32 = 1;
+       int uthsigaltstack = 0;
+       int altstack = 0;
+       
+       
        th_act = current_thread();
        ut = get_bsdthread_info(th_act);
 
@@ -306,15 +309,31 @@ sendsig(struct proc *p, user_addr_t catcher, int sig, int mask, __unused u_long
        }  
 
        trampact = ps->ps_trampact[sig];
-       oonstack = ps->ps_sigstk.ss_flags & SA_ONSTACK;
+       uthsigaltstack = p->p_lflag & P_LTHSIGSTACK;
+       
+       if (uthsigaltstack != 0 )  {
+               oonstack = ut->uu_sigstk.ss_flags & SA_ONSTACK;
+               altstack = ut->uu_flag & UT_ALTSTACK;
+       } else {
+               oonstack = ps->ps_sigstk.ss_flags & SA_ONSTACK;
+               altstack = ps->ps_flags & SAS_ALTSTACK;
+       }
+       
 
        /* figure out where our new stack lives */
-       if ((ps->ps_flags & SAS_ALTSTACK) && !oonstack &&
+       if (altstack && !oonstack &&
                (ps->ps_sigonstack & sigmask(sig))) {
-               sp = ps->ps_sigstk.ss_sp;
-               sp += ps->ps_sigstk.ss_size;
-               stack_size = ps->ps_sigstk.ss_size;
-               ps->ps_sigstk.ss_flags |= SA_ONSTACK;
+               if (uthsigaltstack != 0) {
+                       sp = ut->uu_sigstk.ss_sp;
+                       sp += ut->uu_sigstk.ss_size;
+                       stack_size = ut->uu_sigstk.ss_size;
+                       ut->uu_sigstk.ss_flags |= SA_ONSTACK;
+               } else {
+                       sp = ps->ps_sigstk.ss_sp;
+                       sp += ps->ps_sigstk.ss_size;
+                       stack_size = ps->ps_sigstk.ss_size;
+                       ps->ps_sigstk.ss_flags |= SA_ONSTACK;
+               }
        }
        else {
                if (ctx32 == 0)
@@ -638,8 +657,9 @@ sigreturn(struct proc *p, struct sigreturn_args *uap, __unused int *retval)
        struct uthread * ut;
        int vec_used = 0;
        void *tsptr, *fptr, *vptr;
-        int infostyle = uap->infostyle;
-
+       int infostyle = uap->infostyle;
+       int uthsigaltstack = 0;
+       
        th_act = current_thread();
 
        ut = (struct uthread *)get_bsdthread_info(th_act);
@@ -681,11 +701,21 @@ sigreturn(struct proc *p, struct sigreturn_args *uap, __unused int *retval)
        error = copyin(uctx.uc_mcontext64, mactx, uctx.uc_mcsize);
        if (error)
                return(error);
-       
-       if ((uctx.uc_onstack & 01))
+
+       uthsigaltstack = p->p_lflag & P_LTHSIGSTACK;
+
+
+       if (uctx.uc_onstack & 01) {
+               if (uthsigaltstack != 0)
+                       ut->uu_sigstk.ss_flags |= SA_ONSTACK;
+               else
                        p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK;
-       else
-               p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK;
+       } else {
+               if (uthsigaltstack != 0)
+                       ut->uu_sigstk.ss_flags &= ~SA_ONSTACK;
+               else
+                       p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK;
+       }
 
        ut->uu_sigmask = uctx.uc_sigmask & ~sigcantmask;
        if (ut->uu_siglist & ~ut->uu_sigmask)