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67385a01d2
This patch adds a new feature for powerpc. In order to get faster access to the HWCAP/HWCAP2 bits and platform number (i.e. for implementing __builtin_cpu_is () / __builtin_cpu_supports () in GCC) without the overhead of reading from the auxiliary vector, we now reserve space for them in the TCB. This is an ABI change for GLIBC 2.23. A new versioned symbol '__parse_hwcap_and_convert_at_platform' is available to get the data from the auxiliary vector and parse it, and store it for later use in the TLS initialization code. This function is called very early (in _dl_sysdep_start () via DL_PLATFORM_INFO for the dynamic linking case, and in __libc_start_main () for the static linking case) to make sure the data is available at the time of TLS initialization. * sysdeps/powerpc/Makefile (sysdep-dl-routines): Add hwcapinfo. (sysdep_routines): Likewise. (sysdep-rtld-routines): Likewise. [$(subdir) = nptl](tests): Add test-get_hwcap and test-get_hwcap-static [$(subdir) = nptl](tests-static): test-get_hwcap-static * sysdeps/powerpc/Versions: Added new __parse_hwcap_and_convert_at_platform symbol to GLIBC-2.23. * sysdeps/powerpc/hwcapinfo.c: New file. (__tcb_parse_hwcap_and_convert_at_platform): New function to initialize and parse hwcap, hwcap2 and platform number information. * sysdeps/powerpc/hwcapinfo.h: New file. Creates global variables to store HWCAP+HWCAP2 and platform number. * sysdeps/powerpc/nptl/tcb-offsets.sym: Added new offsets for HWCAP+HWCAP2 and platform number in the TCB. * sysdeps/powerpc/nptl/tls.h: New functionality. Stores the HWCAP, HWCAP2 and platform number in the TCB. (dtv): Added new fields for HWCAP+HWCAP2 and platform number. (TLS_INIT_TP): Included calls to add the hwcap and at_platform values in the TCB in TP initialization. (TLS_DEFINE_INIT_TP): Likewise. (THREAD_GET_HWCAP): New macro. (THREAD_SET_HWCAP): Likewise. (THREAD_GET_AT_PLATFORM): Likewise. (THREAD_SET_AT_PLATFORM): Likewise. * sysdeps/powerpc/powerpc32/dl-machine.h: (dl_platform_init): New function that calls __parse_hwcap_and_convert_at_platform for the dymanic linking case for powerpc32. * sysdeps/powerpc/powerpc64/dl-machine.h: Likewise, for powerpc64. * sysdeps/powerpc/test-get_hwcap-static.c: New file. Testcase for this functionality, static linking case. * sysdeps/powerpc/test-get_hwcap.c: New file. Likewise, dynamic linking case. * sysdeps/unix/sysv/linux/powerpc/libc-start.c: Added call to __parse_hwcap_and_convert_at_platform for the static linking case. * sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist: Included the new __parse_hwcap_and_convert_at_platform symbol in the ABI list for GLIBC 2.23. * sysdeps/unix/sysv/linux/powerpc/powerpc64/ld-le.abilist: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/ld.abilist: Likewise.
106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/* Copyright (C) 1998-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <sysdep.h>
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#ifndef SHARED
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#include <hwcapinfo.h>
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#endif
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int __cache_line_size attribute_hidden;
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/* The main work is done in the generic function. */
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#define LIBC_START_MAIN generic_start_main
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#define LIBC_START_DISABLE_INLINE
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#define LIBC_START_MAIN_AUXVEC_ARG
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#define MAIN_AUXVEC_ARG
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#define INIT_MAIN_ARGS
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#include <csu/libc-start.c>
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struct startup_info
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{
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void *sda_base;
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int (*main) (int, char **, char **, void *);
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int (*init) (int, char **, char **, void *);
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void (*fini) (void);
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};
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int
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__libc_start_main (int argc, char **argv,
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char **ev,
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ElfW (auxv_t) * auxvec,
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void (*rtld_fini) (void),
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struct startup_info *stinfo,
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char **stack_on_entry)
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{
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/* the PPC SVR4 ABI says that the top thing on the stack will
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be a NULL pointer, so if not we assume that we're being called
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as a statically-linked program by Linux... */
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if (*stack_on_entry != NULL)
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{
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char **temp;
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/* ...in which case, we have argc as the top thing on the
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stack, followed by argv (NULL-terminated), envp (likewise),
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and the auxiliary vector. */
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/* 32/64-bit agnostic load from stack */
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argc = *(long int *) stack_on_entry;
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argv = stack_on_entry + 1;
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ev = argv + argc + 1;
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#ifdef HAVE_AUX_VECTOR
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temp = ev;
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while (*temp != NULL)
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++temp;
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auxvec = (ElfW (auxv_t) *)++ temp;
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#endif
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rtld_fini = NULL;
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}
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/* Initialize the __cache_line_size variable from the aux vector. For the
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static case, we also need _dl_hwcap, _dl_hwcap2 and _dl_platform, so we
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can call __tcb_parse_hwcap_and_convert_at_platform (). */
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for (ElfW (auxv_t) * av = auxvec; av->a_type != AT_NULL; ++av)
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switch (av->a_type)
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{
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case AT_DCACHEBSIZE:
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__cache_line_size = av->a_un.a_val;
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break;
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#ifndef SHARED
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case AT_HWCAP:
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_dl_hwcap = (unsigned long int) av->a_un.a_val;
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break;
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case AT_HWCAP2:
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_dl_hwcap2 = (unsigned long int) av->a_un.a_val;
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break;
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case AT_PLATFORM:
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_dl_platform = (void *) av->a_un.a_val;
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break;
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#endif
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}
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/* Initialize hwcap/hwcap2 and platform data so it can be copied to
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the TCB later in __libc_setup_tls (). (static case only). */
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#ifndef SHARED
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__tcb_parse_hwcap_and_convert_at_platform ();
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#endif
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return generic_start_main (stinfo->main, argc, argv, auxvec,
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stinfo->init, stinfo->fini, rtld_fini,
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stack_on_entry);
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}
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