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| author | Roland McGrath <roland@hack.frob.com> | 2012-08-21 15:01:27 -0700 |
|---|---|---|
| committer | Roland McGrath <roland@hack.frob.com> | 2012-08-21 15:01:27 -0700 |
| commit | 21ad055803de5dd03606588753c46fbf8a5863b2 (patch) | |
| tree | cb9f135af9ffea2cb34ffd07f5d77daba060e141 /csu/libc-start.c | |
| parent | 0e1d99119e7851c112aefce64574506f8183e648 (diff) | |
| download | glibc-21ad055803de5dd03606588753c46fbf8a5863b2.tar.gz glibc-21ad055803de5dd03606588753c46fbf8a5863b2.tar.xz glibc-21ad055803de5dd03606588753c46fbf8a5863b2.zip | |
Support static IFUNC calls irrespective of USE_MULTIARCH.
Diffstat (limited to 'csu/libc-start.c')
| -rw-r--r-- | csu/libc-start.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/csu/libc-start.c b/csu/libc-start.c index 0f9bfd7fc5..7e541d4f79 100644 --- a/csu/libc-start.c +++ b/csu/libc-start.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1998-2006, 2007, 2009 Free Software Foundation, Inc. +/* Copyright (C) 1998-2012 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 @@ -46,6 +46,38 @@ uintptr_t __stack_chk_guard attribute_relro; #endif +#ifndef SHARED +# include <link.h> +# include <dl-irel.h> + +# ifdef ELF_MACHINE_IRELA +# define IREL_T ElfW(Rela) +# define IPLT_START __rela_iplt_start +# define IPLT_END __rela_iplt_end +# define IREL elf_irela +# elif defined ELF_MACHINE_IREL +# define IREL_T ElfW(Rel) +# define IPLT_START __rel_iplt_start +# define IPLT_END __rel_iplt_end +# define IREL elf_irel +# endif + +/* We use weak references for these so that we'll still work with a linker + that doesn't define them. Such a linker doesn't support IFUNC at all + and so uses won't work, but a statically-linked program that doesn't + use any IFUNC symbols won't have a problem. */ +extern const IREL_T IPLT_START[] __attribute__ ((weak)); +extern const IREL_T IPLT_END[] __attribute__ ((weak)); + +static void +apply_irel (void) +{ + for (const IREL_T *ipltent = IPLT_START; ipltent < IPLT_END; ++ipltent) + IREL (ipltent); +} +#endif + + #ifdef LIBC_START_MAIN # ifdef LIBC_START_DISABLE_INLINE # define STATIC static @@ -136,8 +168,8 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), } # endif - /* Performe IREL{,A} relocations. */ - __libc_csu_irel (); + /* Perform IREL{,A} relocations. */ + apply_irel (); /* Initialize the thread library at least a bit since the libgcc functions are using thread functions if these are available and |