From a0d47f487fe250c63cc21e9608b85bc02dc2a006 Mon Sep 17 00:00:00 2001 From: Stefan Liebler Date: Tue, 6 Sep 2016 14:44:15 +0200 Subject: S390: Support PLT and GOT references in check-localplt. on s390x the test elf/check-localplt is failing after recent commits: "elf: Do not use memalign for TCB/TLS blocks allocation [BZ #17730]" "elf: Avoid using memalign for TLS allocations [BZ #17730]" "elf: dl-minimal malloc needs to respect fundamental alignment" due to "Missing required PLT reference: ld.so: __libc_memalign". After the commits __libc_memalign is only called in elf/dl-minimal.c in malloc() function in ld.so and gcc -O2/-O3 leads to R_390_GLOB_DAT instead of R_390_JMP_SLOT. __libc_memalign is called via function-pointer loaded from GOT instead of calling via a plt-stub. In this case there is the R_390_GLOB_DAT relocation in section .rela.dyn instead of R_390_JMP_SLOT in .rela.plt. This patch marks ld.so: __libc_memalign with R_390_GLOB_DAT in localplt.data to allow both relocations. If build with -fno-optimize-sibling-calls or on s390(31bit) a R_390_JMP_SLOT is generated. ChangeLog: * sysdeps/unix/sysv/linux/s390/localplt.data: Mark ld.so: __libc_memalign with "+ RELA R_390_GLOB_DAT". --- sysdeps/unix/sysv/linux/s390/localplt.data | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'sysdeps') diff --git a/sysdeps/unix/sysv/linux/s390/localplt.data b/sysdeps/unix/sysv/linux/s390/localplt.data index b25abf8..1226413 100644 --- a/sysdeps/unix/sysv/linux/s390/localplt.data +++ b/sysdeps/unix/sysv/linux/s390/localplt.data @@ -8,7 +8,14 @@ libm.so: matherr # The dynamic loader uses __libc_memalign internally to allocate aligned # TLS storage. The other malloc family of functions are expected to allow # user symbol interposition. -ld.so: __libc_memalign +# It is also allowed to call __libc_memalign via function-pointer loaded from +# GOT instead of calling via a plt-stub. In this case there is a R_390_GLOB_DAT +# relocation in section .rela.dyn instead of R_390_JMP_SLOT in .rela.plt. +# After commit "elf: Do not use memalign for TCB/TLS blocks allocation +# [BZ #17730]" __libc_memalign is only called in elf/dl-minimal.c: malloc() in +# ld.so and gcc -O2/-O3 leads to R_390_GLOB_DAT. If build with +# -fno-optimize-sibling-calls an R_390_JMP_SLOT is generated. +ld.so: __libc_memalign + RELA R_390_GLOB_DAT ld.so: malloc ld.so: calloc ld.so: realloc -- cgit v1.1