Re: [uclibc-ng-devel] [Powerpc] HAVE_ASM_PPC_REL16 and BR2_PIC_PIE

Hello, Recently in Buildroot the option BR2_PIC_PIE has been enabled by default along with other hardening features [1]. Since then some ppc defconfig such qemu_ppc_e500mc_defconfig are failing to boot due to a segfault in init program.

The segfault appear very early in __uClibc_main while starting any binaries, an issue located in crt1.S (powerpc)[2].

After some trial and error, removing HAVE_ASM_PPC_REL16 from CFLAGS [3] allow to generate a working system again. But this is actually wrong since instead we should consider HAVE_ASM_PPC_REL16 always true nowadays. Indeed, Glibc removed HAVE_ASM_PPC_REL16 since version 2.22 [4] since "the minimum binutils supports rel16 relocs". Binutils 2.22 supports R_PPC_REL16 as default. uClibc-ng should remove HAVE_ASM_PPC_REL16 but keep the code as it was defined. But this doesn't fix the initial issue. Any idea ? [1] https://git.buildroot.net/buildroot/commit/?id=810ba387bec3c5b6904e8893fb4c… [2] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/libc/sysdeps/linux/p… [3] https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/tree/Rules.mak?id=2bf4991… [4] https://sourceware.org/git/?p=glibc.git;a=commit;h=59261ad3eb345e0d7b9f5c73… Best regards, Romain _______________________________________________ devel mailing list devel(a)uclibc-ng.org https://mailman.uclibc-ng.org/cgi-bin/mailman/listinfo/devel