Greg Ungerer wrote, > Hi Waldemar, > > On 25/08/16 07:35, Waldemar Brodkorb wrote: > > Hi, > > Greg Ungerer wrote, > > > >> Hi Waldemar, > >> > >> On 19/08/16 08:48, Waldemar Brodkorb wrote: > >>> Hi Greg, > >>> Greg Ungerer wrote, > >>> > >>>> Hi Waldemar, > >>>> > >>>> On 19/03/16 13:53, Greg Ungerer wrote: > >>>>> Hi Waldemar, > >>>>> > >>>>> On 14/03/16 15:01, Waldemar Brodkorb wrote: > >>>>>> Add patchset from ptxdist which is required to produce working > >>>>>> ARM flat binaries. Tested with busybox on Kinetis K70. > >>>>>> > >>>>>> Signed-off-by: Waldemar Brodkorb <w...@openadk.org> > >>>>> > >>>>> Thanks. Applied to the github elf2flt repository (with Thomas' > >>>>> Tested-by). > >>>> > >>>> The adding of the ARM.eidx section in this patch breaks binaries > >>>> that have a global offset table (GOT). I propose the attached fix > >>>> that puts it within the data section proper - and not effectively > >>>> at the start of the data section. > >>>> > >>>> The original patch would have no impact on fully relocated > >>>> binaries, generally only those compiled with -fpic or similar. > >>> > >>> I tested your patch with Buildroot on a STM32F29 device, but it > >>> fails on boot while executing one of the startup scripts: > >>> > >>> [ 0.650000] STM32 USART driver initialized > >>> [ 0.650000] 40011000.serial: ttyS0 at MMIO 0x40011000 (irq = 17, > >>> base_baud = 5625000) is a stm32-usart > >>> [ 0.890000] console [ttyS0] enabled > >>> [ 0.910000] Freeing unused kernel memory: 12K (9000a000 - 9000d000) In > >>> [ 1.260000] > >>> [ 1.260000] Unhandled exception: IPSR = 00000003 LR = fffffff1 > >>> [ 1.260000] CPU: 0 PID: 26 Comm: S20urandom Not tainted 4.5.0 #2 > >>> [ 1.260000] Hardware name: STM32 (Device Tree Support) > >>> [ 1.260000] task: 90550000 ti: 9055a000 task.ti: 9055a000 > >>> [ 1.260000] PC is at 0x21000000 > >>> [ 1.260000] LR is at 0xfffffffd > >>> [ 1.260000] pc : [<21000000>] lr : [<fffffffd>] psr: 40000035 > >>> [ 1.260000] sp : 9055bff8 ip : 9055bfe0 fp : 90555008 > >>> [ 1.260000] r10: 00000000 r9 : 00000003 r8 : 00000024 > >>> [ 1.260000] r7 : 00000072 r6 : 906ccad8 r5 : 00000000 r4 : 00000072 > >>> [ 1.260000] r3 : 00000000 r2 : 00000003 r1 : 906ccafc r0 : ffffffff > >>> [ 1.260000] xPSR: 40000035 > >>> [ 1.260000] CPU: 0 PID: 26 Comm: S20urandom Not tainted 4.5.0 #2 > >>> [ 1.260000] Hardware name: STM32 (Device Tree Support) > >>> [ 1.260000] [<0800bd41>] (unwind_backtrace) from [<0800b0df>] > >>> (show_stack+0xb/0xc) > >>> [ 1.260000] [<0800b0df>] (show_stack) from [<0800b68f>] > >>> (__invalid_entry+0x4b/0x4c) > >>> > >>> Without the patch the system boots up fine. > >> > >> Ok, thanks for the feedback. > >> > >> Can you try this patch instead then? > >> It keeps the ARM.edix table at the same relative position, but moves > >> the _etext symbol to be after the ARM.eidx table. The ARM.eidx section > >> is marked as read-only in the linked ELF file. > > > > This works for me. > > What application is breaking without it? > > Not a specific application. The problem I was trying to solve > was for code compiled PIC. And specifically the case where the > text and data sections where loading at non-contiguous RAM > addresses. > > In the end problem is not so much this (this change only ended > up added a ":text" to to the flatmem redirection of the segment > contents). The problem actually seems to be related to code > generation for symbols with hidden visibility - for the PIC > case they where being loaded via PC relative instructions and > not using register indirect via the designated base register. > > Anyway, for now I don't think this patch is necessary, so you > can ignore it.
Okay. Do you think disabling DOPIC in uClibc-ng is related to the problem? Did you have DOPIC on or off for ypur ARM noMMU tests? I have to disable it. best regards 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
