From afcd9480feca651eef436d8438b783dde5c3bbb2 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Wed, 25 Mar 2015 15:53:47 +1030 Subject: powerpc __tls_get_addr call optimization This patch is glibc support for a PowerPC TLS optimization, inspired by Alexandre Oliva's TLS optimization for other processors, http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt In essence, this optimization uses a zero module id in the tls_index GOT entry to indicate that a TLS variable is allocated space in the static TLS area. A special plt call linker stub for __tls_get_addr checks for such a tls_index and if found, returns the offset immediately. The linker communicates the fact that the special __tls_get_addr stub is used by setting a bit in the dynamic tag DT_PPC64_OPT/DT_PPC_OPT. glibc communicates to the linker that this optimization is available by the presence of __tls_get_addr_opt. tst-tlsmod2.so is built with -Wl,--no-tls-get-addr-optimize for tst-tls-dlinfo, which otherwise would fail since it tests that no static tls is allocated. The ld option --no-tls-get-addr-optimize has been available since binutils-2.20 so doesn't need a configure test. * NEWS: Advertise TLS optimization. * elf/elf.h (R_PPC_TLSGD, R_PPC_TLSLD, DT_PPC_OPT, PPC_OPT_TLS): Define. (DT_PPC_NUM): Increment. * elf/dynamic-link.h (HAVE_STATIC_TLS): Define. (CHECK_STATIC_TLS): Use here. * sysdeps/powerpc/powerpc32/dl-machine.h (elf_machine_rela): Optimize TLS descriptors. * sysdeps/powerpc/powerpc64/dl-machine.h (elf_machine_rela): Likewise. * sysdeps/powerpc/dl-tls.c: New file. * sysdeps/powerpc/Versions: Add __tls_get_addr_opt. * sysdeps/powerpc/tst-tlsopt-powerpc.c: New tls test. * sysdeps/unix/sysv/linux/powerpc/Makefile: Add new test. Build tst-tlsmod2.so with --no-tls-get-addr-optimize. * sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist: Update. * sysdeps/unix/sysv/linux/powerpc/powerpc64/ld.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/ld-le.abilist: Likewise. --- ChangeLog | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'ChangeLog') diff --git a/ChangeLog b/ChangeLog index 1e3d305d62..506032ca4a 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,22 @@ +2015-03-25 Alan Modra + + * NEWS: Advertise TLS optimization. + * elf/elf.h (R_PPC_TLSGD, R_PPC_TLSLD, DT_PPC_OPT, PPC_OPT_TLS): Define. + (DT_PPC_NUM): Increment. + * elf/dynamic-link.h (HAVE_STATIC_TLS): Define. + (CHECK_STATIC_TLS): Use here. + * sysdeps/powerpc/powerpc32/dl-machine.h (elf_machine_rela): Optimize + TLS descriptors. + * sysdeps/powerpc/powerpc64/dl-machine.h (elf_machine_rela): Likewise. + * sysdeps/powerpc/dl-tls.c: New file. + * sysdeps/powerpc/Versions: Add __tls_get_addr_opt. + * sysdeps/powerpc/tst-tlsopt-powerpc.c: New tls test. + * sysdeps/unix/sysv/linux/powerpc/Makefile: Add new test. + Build tst-tlsmod2.so with --no-tls-get-addr-optimize. + * sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist: Update. + * sysdeps/unix/sysv/linux/powerpc/powerpc64/ld.abilist: Likewise. + * sysdeps/unix/sysv/linux/powerpc/powerpc64/ld-le.abilist: Likewise. + 2015-03-25 Alan Modra * sysdeps/powerpc/powerpc64/configure.ac: Correct "linker support -- cgit v1.2.3-70-g09d2