Nitin Garg <nitingar...@gmail.com> writes: > We are using ARM Cortex-A9 processor. The toolchain is gcc-4.0.0 with > uClibc-0.9.30 and the kernel is 2.6.28. > > Using this toolchain when we build any application like "Hello World" > and link it against pthread lib, the application does a segmentation > fault when executed on target and gives "Illegal instruction" error > message. > > I debugged the problem and it came out to be that "swp" instructions > were disabled on the cortex-a9. The SWP instruction has been > deprecated starting with the ARMv6 architecture. On newer ARMv7 > processors, this instruction is disabled by default but it can be > enabled by bit 10 in the System Control register. We can also build > the kernel with CONFIG_OABI_COMPAT enabled. > > The real problem seems to be in the linuxthreads of uClibc where "swp" > is being used for locks. > Shall this not be replaced with ldrex/strex for ARMv7 onwards?
This message is not appropriate for the mailing list g...@gcc.gnu.org. gcc@gcc.gnu.org is for the discussion of gcc development. Please take any followups to this message to gcc-h...@gcc.gnu.org. Thanks. Actually I'm not sure there is any gcc issue here at all. gcc 4.0.0 is fairly old. Ian
