[PATCH] uml: update ld scripts to newer binutils

It seems that linker script for userspace software are quite
toolchain-depending, at least because what we use is a merge between builtin
LD scripts (see strings /usr/bin/ld) and normal kernel linking scripts.

Plus, a number of people are having toolchain-related troubles building UML
(even assertion failures on linking, with Gentoo and Fedora 2).

So, let's try to make UML nicer for binutils.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/dyn.lds.S

@@ -7,8 +7,11 @@ jiffies = jiffies_64;
 
 SECTIONS
 {
+  PROVIDE (__executable_start = START);
   . = START + SIZEOF_HEADERS;
   .interp         : { *(.interp) }
+  /* Used in arch/um/kernel/mem.c. Any memory between START and __binary_start
+   * is remapped.*/
   __binary_start = .;
   . = ALIGN(4096);		/* Init code and data */
   _stext = .;

arch/um/kernel/uml.lds.S

@@ -7,8 +7,12 @@ jiffies = jiffies_64;
 
 SECTIONS
 {
+  /*This must contain the right address - not quite the default ELF one.*/
+  PROVIDE (__executable_start = START);
   . = START + SIZEOF_HEADERS;
 
+  /* Used in arch/um/kernel/mem.c. Any memory between START and __binary_start
+   * is remapped.*/
   __binary_start = .;
 #ifdef MODE_TT
   .thread_private : {
@@ -20,9 +24,13 @@ SECTIONS
   }
   . = ALIGN(4096);
   .remap : { arch/um/kernel/tt/unmap_fin.o (.text) }
-#endif
+
+  /* We want it only if we are in MODE_TT. In both cases, however, when MODE_TT
+   * is off the resulting binary segfaults.*/
 
   . = ALIGN(4096);		/* Init code and data */
+#endif
+
   _stext = .;
   __init_begin = .;
   .init.text : {