[Patch 5/5] I am getting segfaults while still in __uClibc_main when using buildroot's qemu_xtensa_lx60_defconfig and qemu-xtensa. I'm not sure the exact cause, but I would guess that some functions aren't being relocated correctly or the TLS wasn't updated correctly. It could also possibly be a problem with the quick gcc patch I wrote to compile with -static-pie. If you have a gcc patch that you think will fix this as well, I would be glad to test it.
You're right, the following recent binutils and gcc changes are required for generation of correct relocations and recognition of the -static-pie option:
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=658ba81aef5e85... https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=658ba81aef5e85a08d67eb211a43c6db775a36b3
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=9e0c2696724d4d004ea189a69f... https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=9e0c2696724d4d004ea189a69f15781c7baa68e1
The binutils patch fixed the problems! I was able to make a xtensa toolchain which worked with my test programs for C and C++.
On Wed, Sep 14, 2022 at 4:15 PM Lance Fredrickson lancethepants@gmail.com wrote:
On 9/14/2022 1:23 PM, linted wrote:
[Patch 5/5] I am getting segfaults while still in __uClibc_main when using buildroot's qemu_xtensa_lx60_defconfig and qemu-xtensa. I'm not sure the exact cause, but I would guess that some functions aren't being relocated correctly or the TLS wasn't updated correctly. It could also possibly be a problem with the quick gcc patch I wrote to compile with -static-pie. If you have a gcc patch that you think will fix this as well, I would be glad to test it.
I've had -static-pie binaries segfault with qemu while they ran fine on actual hardware. I was using Debian 10 so maybe that's because it's an old version of qemu, and maybe newer versions can handle this better?
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