Hi uClinux/elf2flt devs, How can I debug an issue with the following error while executing: ~ # ./hello BINFMT_FLAT: reloc outside program 0xb5890000 (0 - 0x125a4/0x8b0c), killing hello! SEGV
The target is an ARM Cortex-M4 device. The error is only happening when libpthread from uClibc-ng is used in the binary. Non-threading applications are working fine. (Linuxthreads.old used) The problem was reported by Thomas Petazzoni from Buildroot project. On the build system I used this example code: http://timmurphy.org/2010/05/04/pthreads-in-c-a-minimal-working-example/ $ /usr/bin/arm-openadk-uclinux-uclibceabi-gcc -o hello hello.c -lpthread $ /usr/bin/arm-openadk-uclinux-uclibceabi-flthdr -k hello $ /usr/bin/arm-openadk-uclinux-uclibceabi-flthdr -p hello hello Magic: bFLT Rev: 4 Build Date: Tue Apr 5 12:28:25 2016 Entry: 0x45 Data Start: 0x8b4c Data End: 0xe384 BSS End: 0x125e0 Stack Size: 0x1000 Reloc Start: 0xe384 Reloc Count: 0x197 Flags: 0x11 ( Load-to-Ram Kernel-Traced-Load ) On the target system: ~ # ./hello BINFMT_FLAT: Loading file: ./hello Mapping is 70020000, Entry point is 45, data_start is 8b4c Load ./hello: TEXT=70020040-70028b4c DATA=70028b50-7002e388 BSS=7002e388-700325e4 BINFMT_FLAT: reloc outside program 0xb5890000 (0 - 0x125a4/0x8b0c), killing hello! SEGV You can find readelf, objdump -x, objdump -D and the source of hello.c here: http://debug.openadk.org/arm-pthreads/ Stracing the process does not work: ~ # ./strace ./hello BINFMT_FLAT: Loading file: ./hello ./strace: Can't attach to 45: No such process ~ # Mapping is 70560000, Entry point is 45, data_start is 8b4c Load ./hello: TEXT=70560040-70568b4c DATA=70568b50-7056e388 BSS=7056e388-705725e4 BINFMT_FLAT: reloc outside program 0xb5890000 (0 - 0x125a4/0x8b0c), killing hello! gdbserver (gdb 7.11) does not compile for me as it uses fork(): build-gnulib-gdbserver/import/libgnu.a build-libiberty-gdbserver/libiberty.a -lthread_db linux-low.o: In function `linux_create_inferior': linux-low.c:(.text+0x25d2): undefined reference to `fork' linux-ptrace.o: In function `linux_child_function': linux-ptrace.c:(.text+0x24): undefined reference to `fork' linux-ptrace.o: In function `linux_check_ptrace_features': linux-ptrace.c:(.text+0x10a): undefined reference to `fork' thread-db.o: In function `thread_db_init': thread-db.c:(.text+0x520): undefined reference to `td_thr_tlsbase' collect2: error: ld returned 1 exit status I searched the internet and found that it might be stack size related. But even compiling example code and C library with -Wl,-elf2flt=-s16384 didn't help. Any help is appreciated, thanks Waldemar _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
