port-mips/44375: NetBSD/mips 1.6 binary doesn't work on NetBSD/mips -current

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         44375
>Category:       port-mips
>Synopsis:       NetBSD/mips 1.6 binary doesn't work on NetBSD/mips -current
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-mips-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 12 11:45:00 +0000 2011
>Originator:     Izumi Tsutsui
>Release:        NetBSD 5.99.43
>Organization:
>Environment:

System: NetBSD/pmax 5.99.43 on GXemul and 3MIN, NetBSD/sgimips on O2
Architecture: mips
Machine: confirmed on pmax and sgimips, but maybe affects all mips ports

>Description:
NetBSD/mips 1.6 binaries doesn't work on recent NetBSD/mips 5.99.43
on a GENERIC kernel with options COMPAT_12 .. 50 due to "Exec format error."

>How-To-Repeat:
For a quick test:
- install gxemul
- fetch 
ftp://ftp.NetBSD.org/pub/NetBSD/misc/tsutsui/fsimage/pmax-201101090300Z.img.gz
- gunzip pmax-201101090300Z.img.gz
- gxemul -Xe 3max -d pmax-201101090300Z.img
- in gxemul window:
 login: root
  :
 # /echo-1.6
 /echo-1.6: Exec format error. Wrong Architecture.
 # file /echo-1.6
 /echo-1.6: ELF 32-bit LSB executable, MIPS, MIPS-I version 1 (SYSV), 
statically linked, for NetBSD, stripped
 # uname -a
 NetBSD  5.99.43 NetBSD 5.99.43 (GENERIC) #0: Sun Jan  9 03:13:28 UTDC 2011  
builds%b7.netbsd.org@localhost:/home/builds/ab/HEAD/pmax/201101090300Z-obj/home/builds/ab/HEAD/src/sys/arch/pmax/compile/GENERIC
 pmax
 #

- Dynamic linked binares don't work either.
- Also happens on NetBSD/pmax on real 3MIN (R3000)
  and NetBSD/sgmips real O2 (R5000).
- Works fine on NetBSD/sgimips 5.99.22 kernel on the same O2.

>Fix:
Check arch/mips/mips/cpu_exec.c etc?

---
Izumi Tsutsui

>Unformatted:
 Fetched from HEAD/201101090300Z on daily build