I have been trying to run busybox-1.00 ( also rc3) on my powerpc board (MPC 8540 processor ) and about half the applets do not run and die with the message "Illegal instruction". I have ppc_82xx-gcc Montavista compiler for the power pc board. These compilers are cross compiled version of gcc 3.3.1 compiler. We are using the cross compiled glibc-2.3.2. Some critical applets which are failing with Illegal instruction message are : ar ash bunzip2 bzcat cat chgrp chown cmp cp cpio crond install ln ls mkdir tty wc cut date df du egrep env expr fgrep find modprobe mount rm rmdir route uname wget ftpget ftpput grep gunzip halt head httpd id ifconfig inetd sh sort syslogd uniq xargs tee telnetd touch tr vi yes zcat. About half the commands are broken. When I compile with no optimization or optimize for speed i.e. -O2 instead for size -Os, everything works fine. Seems like an optimzation bug to me. -- Atul The configure command for cross compiling gcc was as below ( output of ppc_82xx-gcc -v ) :: Reading specs from /opt/montavista/pro/devkit/ppc/82xx/bin/../lib/gcc- lib/powerpc-hardhat-linux/3.3.1/specs Configured with: ../configure --host=i686-pc-linux-gnu --target=powerpc- hardhat-linux --prefix=/opt/montavista/devkit/ppc/82xx --exec- prefix=/opt/montavista/devkit/ppc/82xx --bindir=/opt/montavista/devkit/ppc/82xx/bin -- sbindir=/opt/montavista/devkit/ppc/82xx/sbin --sysconfdir=/opt/montavista/devkit/ppc/82xx/etc -- datadir=/opt/montavista/devkit/ppc/82xx/share --includedir=/opt/montavista/devkit/ppc/82xx/include -- libdir=/opt/montavista/devkit/ppc/82xx/lib --libexecdir=/opt/montavista/devkit/ppc/82xx/libexec -- localstatedir=/opt/montavista/devkit/ppc/82xx/var --sharedstatedir=/opt/montavista/devkit/ppc/82xx/share -- mandir=/opt/montavista/devkit/ppc/82xx/man --infodir=/opt/montavista/devkit/ppc/82xx/info --program-transform- name=s,^,ppc_82xx-, --enable-cross --with-sysroot=/opt/montavista/devkit/ppc/82xx/target --enable-shared --enable- languages=c,c++ --enable-__cxa_atexit --enable-threads=posix --disable-multilib --with-gxx-include- dir='$'{gcc_tooldir}/../target/usr/include/c++/3.3.1 --with-cpu=603 Thread model: posix gcc version 3.3.1 (MontaVista 3.3.1-3.0.10.0300532 2003-12-24)
Hmm, you compiled for cpu=603 but the 82xx processor is not fully the same, also do you have a simple testcase? read <http://gcc.gnu.org/bugs.html> also.
Subject: RE: FW: gcc 3.3.1 for Powerpc optimzation flag -Os generates bad code I do not have a simple test case at this point which triggers this flaw. A simple busybox applet e.g ls causes "Illegal instruction". Its about 1000 lines of code with comments. It has some libraries too. If I am able to isolate further would notify you. -- Atul -----Original Message----- From: pinskia at gcc dot gnu dot org [mailto:gcc-bugzilla@gcc.gnu.org] Sent: Thursday, December 09, 2004 1:33 PM To: atul.sabharwal@tek.com Subject: [Bug target/18912] FW: gcc 3.3.1 for Powerpc optimzation flag -Os generates bad code ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-09 21:33 ------- Hmm, you compiled for cpu=603 but the 82xx processor is not fully the same, also do you have a simple testcase? read <http://gcc.gnu.org/bugs.html> also. -- What |Removed |Added ---------------------------------------------------------------------------- Severity|critical |normal Status|UNCONFIRMED |WAITING Component|c |target http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18912 ------- You are receiving this mail because: ------- You reported the bug, or are watching the reporter.
Also does -mcpu=8540 fix the problem then when compiling?
Subject: RE: FW: gcc 3.3.1 for Powerpc optimzation flag -Os generates bad code I tried -mpcu=8540 and it does not fix the problem. Commands like ls or ash still fail. I checked the build scripts and its using this new flag. -- Atul -----Original Message----- From: pinskia at gcc dot gnu dot org [mailto:gcc-bugzilla@gcc.gnu.org] Sent: Thursday, December 09, 2004 2:04 PM To: atul.sabharwal@tek.com Subject: [Bug target/18912] FW: gcc 3.3.1 for Powerpc optimzation flag -Os generates bad code ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-09 22:03 ------- Also does -mcpu=8540 fix the problem then when compiling?
This bug is fixed in 3.4.1 version of gcc. I received a cross compiled version of gcc for MPC8540 platform with the 3.4.1 gcc based tool chain and all busybox apps work correctly.
Closing as fixed then.