23 Jun
2015
23 Jun
'15
7:21 p.m.
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- Log -----------------------------------------------------------------
commit d551a039ad443e1ba1c29461b43ca865785fbb68
Author: Waldemar Brodkorb <wbx(a)openadk.org>
Date: Tue Jun 23 21:18:49 2015 +0200
add patch from ldso-future branch
Fixes segfaults when gcc 5.1 is used for x86.
http://git.uclibc.org/uClibc/commit/ldso/ldso/i386/dl-sysdep.h?h=ldso-futur…
Mentioned in #uclibc.
-----------------------------------------------------------------------
Summary of changes:
ldso/ldso/i386/dl-sysdep.h | 30 +++++++++++++-----------------
1 file changed, 13 insertions(+), 17 deletions(-)
diff --git a/ldso/ldso/i386/dl-sysdep.h b/ldso/ldso/i386/dl-sysdep.h
index a66c802..8efa1a8 100644
--- a/ldso/ldso/i386/dl-sysdep.h
+++ b/ldso/ldso/i386/dl-sysdep.h
@@ -37,31 +37,27 @@ extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int
reloc_ent
| (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY))
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
- first element of the GOT. This must be inlined in a function which
- uses global data. */
-static __always_inline Elf32_Addr elf_machine_dynamic (void) attribute_unused;
-static __always_inline Elf32_Addr
+ first element of the GOT, a special entry that is never relocated. */
+extern const Elf32_Addr _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
+static __always_inline Elf32_Addr __attribute__ ((unused, const))
elf_machine_dynamic (void)
{
- register Elf32_Addr *got __asm__ ("%ebx");
- return *got;
+ /* This produces a GOTOFF reloc that resolves to zero at link time, so in
+ fact just loads from the GOT register directly. By doing it without
+ an asm we can let the compiler choose any register. */
+ return _GLOBAL_OFFSET_TABLE_[0];
}
+extern Elf32_Dyn bygotoff[] __asm__ ("_DYNAMIC") attribute_hidden;
/* Return the run-time load address of the shared object. */
-static __always_inline Elf32_Addr elf_machine_load_address (void) attribute_unused;
-static __always_inline Elf32_Addr
+static __always_inline Elf32_Addr attribute_unused
elf_machine_load_address (void)
{
- /* It doesn't matter what variable this is, the reference never makes
- it to assembly. We need a dummy reference to some global variable
- via the GOT to make sure the compiler initialized %ebx in time. */
- Elf32_Addr addr;
- int tmp;
- __asm__ ("leal _dl_start@GOTOFF(%%ebx), %0\n"
- "subl _dl_start@GOT(%%ebx), %0"
- : "=r" (addr) : "m" (tmp) : "cc");
- return addr;
+ /* Compute the difference between the runtime address of _DYNAMIC as seen
+ by a GOTOFF reference, and the link-time address found in the special
+ unrelocated first GOT entry. */
+ return (Elf32_Addr) &bygotoff - elf_machine_dynamic ();
}
static __always_inline void
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uClibc-ng - small C library for embedded systems