linux: Consolidate brk implementation

It removes all the arch-specific assembly implementation.  The
outliers are alpha, where its kernel ABI explict return -ENOMEM
in case of failure; and i686, where it can't use
"call *%gs:SYSINFO_OFFSET" during statup in static PIE.

Also some ABIs exports an additional ___brk_addr symbol and to
handle it an internal HAVE_INTERNAL_BRK_ADDR_SYMBOL is added.

Checked on x86_64-linux-gnu, i686-linux-gnu, adn with builsd for
the affected ABIs.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

1 files changed, 1 insertions, 22 deletions

diff --git a/sysdeps/unix/sysv/linux/i386/brk.c b/sysdeps/unix/sysv/linux/i386/brk.c
index 021b6d37a0..8d7b7d42cc 100644
--- a/sysdeps/unix/sysv/linux/i386/brk.c
+++ b/sysdeps/unix/sysv/linux/i386/brk.c
@@ -21,25 +21,4 @@
 # define I386_USE_SYSENTER 0
 #endif
 
-#include <errno.h>
-#include <unistd.h>
-#include <sysdep.h>
-
-/* This must be initialized data because commons can't have aliases.  */
-void *__curbrk = 0;
-
-/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
-   to work around different old braindamage in the old Linux ELF dynamic
-   linker.  */
-weak_alias (__curbrk, ___brk_addr)
-
-int
-__brk (void *addr)
-{
-  void *newbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
-  __curbrk = newbrk;
-  if (newbrk < addr)
-    return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOMEM);
-  return 0;
-}
-weak_alias (__brk, brk)
+#include <sysdeps/unix/sysv/linux/brk.c>