http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/unix/sysv/linux/sh/socket.S.diff?r1=1.5&r2=1.6&cvsroot=glibc

 Ankur Sheth said:

 "The problem that I ran into was that multi-threaded apps would crash with a

 seg fault when they invoked some of the socket calls (sendto() in my case.

 This happened only on the sh4.  Turns out that a certain register (PR) was

 not being saved and restored properly before and after invoking the system

 call.  This patch fixes it.  It applies cleanly on glibc 2.3.2. 

 [Thanks to Kaz for helping us find this.]"

 ===================================================================

 RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/sh/socket.S,v

 retrieving revision 1.5

 retrieving revision 1.6

 diff -u -r1.5 -r1.6

 --- libc/sysdeps/unix/sysv/linux/sh/socket.S	2003/01/05 11:07:44	1.5

 +++ libc/sysdeps/unix/sysv/linux/sh/socket.S	2003/07/12 01:25:53	1.6

 @@ -94,7 +94,9 @@

  #if defined NEED_CANCELLATION && defined CENABLE

  .Lsocket_cancel:

  	/* Enable asynchronous cancellation.  */

 +	sts.l pr,@-r15

  	CENABLE

 +	lds.l @r15+,pr

  	/* Do the system call trap.  */

  	mov #+P(SOCKOP_,socket), r4

 @@ -102,9 +104,11 @@

  	mov.l .L1,r3

  	trapa #0x12

 +	sts.l pr,@-r15

  	mov.l r0,@-r15

  	CDISABLE

  	mov.l @r15+,r0

 +	lds.l @r15+,pr

  	/* Pop args off the stack */

  	P(POPARGS_,NARGS)