(rt_sigreturn): Make compatible with older kernels.

diff --git a/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S b/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
index 1d98de9..3959e5d 100644 (file)
--- a/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
+++ b/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998  Free Software Foundation, Inc.
+/* Copyright (C) 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Richard Henderson <rth@cygnus.com>, 1998
 
@@ -16,17 +16,17 @@
    License along with the GNU C Library; see the file COPYING.LIB.  If not,
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
-       
+
 #include <sysdep.h>
-       
+
 /* On Alpha we desparately want to avoid having to issue an imb.  Ordinarily
    the kernel would have to issue one after setting up the signal return
    stack, but the Linux rt_sigaction syscall is prepared to accept a pointer
-   to the sigreturn syscall, instead of inlining it on the stack. 
-       
+   to the sigreturn syscall, instead of inlining it on the stack.
+
    This just about halves signal delivery time.  */
-       
-   
+
+#ifdef __NR_rt_sigaction
        .text
 ENTRY(__syscall_rt_sigaction)
        .frame  sp,0,ra,0
@@ -38,7 +38,7 @@ ENTRY(__syscall_rt_sigaction)
        .set at
 #endif
        .prologue 1
-       
+
        beq     a1, 0f
        ldl     t0, 8(a1)                               # sa_flags
        lda     a4, sigreturn-__syscall_rt_sigaction(pv)
@@ -46,10 +46,10 @@ ENTRY(__syscall_rt_sigaction)
        and     t0, 0x00000040, t0                      # SA_SIGINFO
        cmovne  t0, t1, a4
 0:     ldi     v0,__NR_rt_sigaction
-       callsys    
+       callsys
        bne     a3,1f
        ret
-       
+
 1:
 #ifndef PROF
        br      gp,2f
@@ -76,3 +76,10 @@ rt_sigreturn:
        ldi     v0,__NR_rt_sigreturn
        callsys
        .end    rt_sigreturn
+#else
+ENTRY(__syscall_rt_sigaction)
+       ldgp $29,0($27)
+       ldi $0,ENOSYS
+       jmp __syscall_error
+END(__syscall_rt_sigaction)
+#endif