I have a fix I think. I found this while working on ilp32 too.
Thanks, Andrew
On Apr 1, 2014, at 8:20 PM, "Michael Hudson-Doyle" michael.hudson@canonical.com wrote:
Hi all,
I've just filed a bug on glibc I'd love you to take a look at: https://sourceware.org/bugzilla/show_bug.cgi?id=16796
Here's the description to save clicking:
Hi,
There is a test in glibc (tst-tls5) that tests that ((uintptr_t)pthread_self())%16 is zero. But watch this:
(t-mwhudson)mwhudson@am1:~$ cat btp.c #include <stdint.h> #include <stdio.h> #include <pthread.h>
int main(int argc, char** argv) { uintptr_t p = (uintptr_t)__builtin_thread_pointer(); uintptr_t q = (uintptr_t)pthread_self(); printf("p: %lx %ld\n", p, p%16); printf("q: %lx %ld\n", q, q%16); } (t-mwhudson)mwhudson@am1:~$ gcc -o btp btp.c -lpthread (t-mwhudson)mwhudson@am1:~$ ulimit -s unlimited (t-mwhudson)mwhudson@am1:~$ ./btp p: 2000028d88 8 q: 2000028698 8 (t-mwhudson)mwhudson@am1:~$ ulimit -S -s 8192 (t-mwhudson)mwhudson@am1:~$ ./btp p: 7f7fd086f0 0 q: 7f7fd08000 0
So something is clearly wrong; maybe it's just that the test is too strict, but somehow that seems a bit unlikely. FWIW, this doesn't happen if you don't link with libpthread so maaaaybe it's a bug in something that ends up in libpthread's .init section?
Cheers, mwh
linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain