diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/libc-vdso.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/libc-vdso.h | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h b/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h deleted file mode 100644 index fb9509e2e7..0000000000 --- a/sysdeps/unix/sysv/linux/powerpc/libc-vdso.h +++ /dev/null @@ -1,74 +0,0 @@ -/* Resolve function pointers to VDSO functions. - Copyright (C) 2005-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - - -#ifndef _LIBC_VDSO_H -#define _LIBC_VDSO_H - -#ifdef SHARED - -#include <sysdep-vdso.h> - -extern int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *) - attribute_hidden; -extern int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *); -extern int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *); -extern unsigned long long (*VDSO_SYMBOL(get_tbfreq)) (void); -extern int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *); -extern time_t (*VDSO_SYMBOL(time)) (time_t *); - -#if defined(__PPC64__) || defined(__powerpc64__) -extern void *VDSO_SYMBOL(sigtramp_rt64); -#else -extern void *VDSO_SYMBOL(sigtramp32); -extern void *VDSO_SYMBOL(sigtramp_rt32); -#endif - -#if (defined(__PPC64__) || defined(__powerpc64__)) && _CALL_ELF != 2 -/* The correct solution is for _dl_vdso_vsym to return the address of the OPD - for the kernel VDSO function. That address would then be stored in the - __vdso_* variables and returned as the result of the IFUNC resolver function. - Yet, the kernel does not contain any OPD entries for the VDSO functions - (incomplete implementation). However, PLT relocations for IFUNCs still expect - the address of an OPD to be returned from the IFUNC resolver function (since - PLT entries on PPC64 are just copies of OPDs). The solution for now is to - create an artificial static OPD for each VDSO function returned by a resolver - function. The TOC value is set to a non-zero value to avoid triggering lazy - symbol resolution via .glink0/.plt0 for a zero TOC (requires thread-safe PLT - sequences) when the dynamic linker isn't prepared for it e.g. RTLD_NOW. None - of the kernel VDSO routines use the TOC or AUX values so any non-zero value - will work. Note that function pointer comparisons will not use this artificial - static OPD since those are resolved via ADDR64 relocations and will point at - the non-IFUNC default OPD for the symbol. Lastly, because the IFUNC relocations - are processed immediately at startup the resolver functions and this code need - not be thread-safe, but if the caller writes to a PLT slot it must do so in a - thread-safe manner with all the required barriers. */ -#define VDSO_IFUNC_RET(value) \ - ({ \ - static Elf64_FuncDesc vdso_opd = { .fd_toc = ~0x0 }; \ - vdso_opd.fd_func = (Elf64_Addr)value; \ - &vdso_opd; \ - }) - -#else -#define VDSO_IFUNC_RET(value) ((void *) (value)) -#endif - -#endif - -#endif /* _LIBC_VDSO_H */ |