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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. |
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| .. | ||
| 970 | ||
| a2 | ||
| cell | ||
| fpu | ||
| ____longjmp_chk.S | ||
| brk.S | ||
| c++-types.data | ||
| clone.S | ||
| configure | ||
| configure.ac | ||
| dl-cache.h | ||
| fcntl.c | ||
| getcontext.S | ||
| Implies | ||
| kernel_stat.h | ||
| ld-le.abilist | ||
| ld.abilist | ||
| ldsodefs.h | ||
| libanl-le.abilist | ||
| libanl.abilist | ||
| libBrokenLocale-le.abilist | ||
| libBrokenLocale.abilist | ||
| libc-le.abilist | ||
| libc.abilist | ||
| libcrypt-le.abilist | ||
| libcrypt.abilist | ||
| libdl-le.abilist | ||
| libdl.abilist | ||
| libm-le.abilist | ||
| libm.abilist | ||
| libnsl-le.abilist | ||
| libnsl.abilist | ||
| libpthread-le.abilist | ||
| libpthread.abilist | ||
| libresolv-le.abilist | ||
| libresolv.abilist | ||
| librt-le.abilist | ||
| librt.abilist | ||
| libthread_db-le.abilist | ||
| libthread_db.abilist | ||
| libutil-le.abilist | ||
| libutil.abilist | ||
| localplt.data | ||
| makecontext.S | ||
| setcontext.S | ||
| shlib-versions | ||
| socket.S | ||
| swapcontext.S | ||
| sync_file_range.c | ||
| syscalls.list | ||
| sysdep-cancel.h | ||
| sysdep.h | ||
| timer_create.c | ||
| timer_delete.c | ||
| timer_getoverr.c | ||
| timer_gettime.c | ||
| timer_settime.c | ||
| ucontext_i.sym | ||
| umount.c | ||
| Versions | ||
| vfork.S | ||