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2017-06-14PowerPC64 ELFv2 PPC64_OPT_LOCALENTRYAlan Modra
ELFv2 functions with localentry:0 are those with a single entry point, ie. global entry == local entry, that have no requirement on r2 or r12 and guarantee r2 is unchanged on return. Such an external function can be called via the PLT without saving r2 or restoring it on return, avoiding a common load-hit-store for small functions. This patch implements the ld.so changes necessary for this optimization. ld.so needs to check that an optimized plt call sequence is in fact calling a function implemented with localentry:0, end emit a fatal error otherwise. The elf/testobj6.c change is to stop "error while loading shared libraries: expected localentry:0 `preload'" when running elf/preloadtest, which we'd get otherwise. * elf/elf.h (PPC64_OPT_LOCALENTRY): Define. * sysdeps/alpha/dl-machine.h (elf_machine_fixup_plt): Add refsym and sym parameters. Adjust callers. * sysdeps/aarch64/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/arm/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/generic/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/hppa/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/i386/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/ia64/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/m68k/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/microblaze/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/mips/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/nios2/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/powerpc/powerpc32/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/s390/s390-32/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/s390/s390-64/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/sh/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/sparc/sparc32/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/sparc/sparc64/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/tile/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/x86_64/dl-machine.h (elf_machine_fixup_plt): Likewise. * sysdeps/powerpc/powerpc64/dl-machine.c (_dl_error_localentry): New. (_dl_reloc_overflow): Increase buffser size. Formatting. * sysdeps/powerpc/powerpc64/dl-machine.h (ppc64_local_entry_offset): Delete reloc param, add refsym and sym. Check optimized plt call stubs for localentry:0 functions. Adjust callers. (elf_machine_fixup_plt, elf_machine_plt_conflict): Add refsym and sym parameters. Adjust callers. (_dl_reloc_overflow): Move attribute. (_dl_error_localentry): Declare. * elf/dl-runtime.c (_dl_fixup): Save original sym. Pass refsym and sym to elf_machine_fixup_plt. * elf/testobj6.c (preload): Call printf.
2000-12-15Update.Andreas Jaeger
2000-12-15 Andreas Jaeger <aj@suse.de> * stdio-common/scanf9.c (main): Reformat and change to avoid warnings. * stdio-common/tstdiomisc.c: Make local functions static. * stdio-common/tst-printf.c: Likewise. * elf/constload2.c: Add prototype declarations to shut up gcc. * elf/dep1.c: Likewise. * elf/dep2.c: Likewise. * elf/dep3.c: Likewise. * elf/dep4.c: Likewise. * elf/ltglobmod2.c: Likewise. * libio/fmemopen.c: Make local functions static. * elf/Makefile (distribute): Added testobj.h. * elf/testobj.h: New file. * elf/testobj1.c: Include testobj.h and move prototype declarations to testobj.h. * elf/testobj2.c: Likewise. * elf/testobj3.c: Likewise. * elf/testobj4.c: Likewise. * elf/testobj5.c: Likewise. * elf/testobj6.c: Likewise. * elf/testobj1_1.c: Likewise. * elf/preloadtest.c: Likewise.
1999-01-21Update.Ulrich Drepper
1999-01-21 Ulrich Drepper <drepper@cygnus.com> * elf/Makefile: Change rule to make test module so that they are compiled using -fPIC. * elf/testobj1.c: Add missing prototype. * elf/testobj1_1.c: Likewise. * elf/testobj2.c: Likewise. * elf/testobj3.c: Likewise. * elf/testobj4.c: Likewise. * elf/testobj5.c: Likewise. * elf/testobj6.c: Likewise.
1999-01-20Update.Ulrich Drepper
1999-01-20 Ulrich Drepper <drepper@cygnus.com> * elf/Makefile (tests): Add preloadtest. Add rules to build more test modules and the preloadtest binary. * elf/loadtest.c (TEST_ROUNDS): Increase to 1000. (testobjs): Add more modules. (tests): Add entries for new modules. * elf/preloadtest.c: New file. Test for LD_PRELOAD. * elf/testobj1.c: Add 'preload' function. * elf/testobj2.c: Likewise. * elf/testobj3.c: Likewise. * elf/testobj4.c: New file. * elf/testobj5.c: New file. * elf/testobj6.c: New file.