yann@1: 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
yann@1: 
yann@1: Ankur Sheth said:
yann@1: "The problem that I ran into was that multi-threaded apps would crash with a
yann@1: seg fault when they invoked some of the socket calls (sendto() in my case.
yann@1: This happened only on the sh4.  Turns out that a certain register (PR) was
yann@1: not being saved and restored properly before and after invoking the system
yann@1: call.  This patch fixes it.  It applies cleanly on glibc 2.3.2. 
yann@1: [Thanks to Kaz for helping us find this.]"
yann@1: 
yann@1: ===================================================================
yann@1: RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/sh/socket.S,v
yann@1: retrieving revision 1.5
yann@1: retrieving revision 1.6
yann@1: diff -u -r1.5 -r1.6
yann@1: --- libc/sysdeps/unix/sysv/linux/sh/socket.S	2003/01/05 11:07:44	1.5
yann@1: +++ libc/sysdeps/unix/sysv/linux/sh/socket.S	2003/07/12 01:25:53	1.6
yann@1: @@ -94,7 +94,9 @@
yann@1:  #if defined NEED_CANCELLATION && defined CENABLE
yann@1:  .Lsocket_cancel:
yann@1:  	/* Enable asynchronous cancellation.  */
yann@1: +	sts.l pr,@-r15
yann@1:  	CENABLE
yann@1: +	lds.l @r15+,pr
yann@1:  
yann@1:  	/* Do the system call trap.  */
yann@1:  	mov #+P(SOCKOP_,socket), r4
yann@1: @@ -102,9 +104,11 @@
yann@1:  	mov.l .L1,r3
yann@1:  	trapa #0x12
yann@1:  
yann@1: +	sts.l pr,@-r15
yann@1:  	mov.l r0,@-r15
yann@1:  	CDISABLE
yann@1:  	mov.l @r15+,r0
yann@1: +	lds.l @r15+,pr
yann@1:  
yann@1:  	/* Pop args off the stack */
yann@1:  	P(POPARGS_,NARGS)