Subject: Problem with "sync" in NetBSD-current...
To: None <>
From: Peter Froehlich <>
List: port-cobalt
Date: 02/13/2007 12:34:58
Hi all,

I am trying to build NetBSD-current for my Qube 2, and I thought I  
ask here first before asking on port-mips or current-users.

Things break apart in the pthreads stuff where a "sync" instruction  
is emitted which apparently conflicts with the idea that this should  
run on MIPS I machines as well. Here's the error message from my  
build log:

#   compile  libpthread/pthread_lock.o
gcc -O2 -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer- 
arith -Wno-sign-compare -Wno-traditional -Wreturn-type -Wswitch - 
Wshadow -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter - 
std=gnu99  -Werror   -Wno-cast-qual  -I/home/phf/CURRENT/src/lib/ 
libpthread/arch/mips -I/home/phf/CURRENT/src/lib/libpthread -I/home/ 
phf/CURRENT/src/lib/libpthread/obj -D_LIBC -D__LIBPTHREAD_SOURCE__ -I/ 
home/phf/CURRENT/src/sys -I/home/phf/CURRENT/src/lib/libpthread/../ 
libc   -nostdinc -isystem /home/phf/CURRENT/src/destdir.cobalt/usr/ 
include -c    /home/phf/CURRENT/src/lib/libpthread/pthread_lock.c -o  
/var/tmp//ccfflyyH.s: Assembler messages:
/var/tmp//ccfflyyH.s:83: Error: opcode not supported on this  
processor: mips1 (mips1) `sync'
/var/tmp//ccfflyyH.s:132: Error: opcode not supported on this  
processor: mips1 (mips1) `sync'

I've looked at the assembly for this. Curiously enough the "sync" is  
emitted also in line 106 but there it doesn't lead to an error  
message? The functions that lead to errors are


while the function that *doesn't* lead to an error from the assembler is


which is all the more confusing since all three functions are one- 
liners in the C source:

static void
pthread__atomic_simple_lock_init(__cpu_simple_lock_t *alp)


static int
pthread__atomic_simple_lock_try(__cpu_simple_lock_t *alp)

         return (__cpu_simple_lock_try(alp));

static void
pthread__atomic_simple_unlock(__cpu_simple_lock_t *alp)


In turn, the functions called here are from <mips/lock.h> and  
(eventually) do mb_memory() which is defined as follows:

static __inline void
__asm volatile("sync" ::: "memory");

So I *assume* that there should be some kind of conditional  
compilation happening here to avoid sending these out for MIPS I? On  
the other hand, why the heck do I need to compile for MIPS I if I am  
running NetBSD on a Qube 2 that implements MIPS IV (of which "sync"  
is certainly part)? Is there a simple way to tell the build system to  
compile for MIPS IV instead? Shouldn't that be happening for the  
cobalt port anyway?

Peter H. Froehlich <><><><><><>
OpenPGP: ABC2 9BCC 1445 86E9 4D59  F532 A8B2 BFAE 342B E9D9