elf: Fix dynamic-link.h usage on rtld.c

The 4af6982e4c fix does not fully handle RTLD_BOOTSTRAP usage on
rtld.c due two issues:

  1. RTLD_BOOTSTRAP is also used on dl-machine.h on various
     architectures and it changes the semantics of various machine
     relocation functions.

  2. The elf_get_dynamic_info() change was done sideways, previously
     to 490e6c62aa get-dynamic-info.h was included by the first
     dynamic-link.h include *without* RTLD_BOOTSTRAP being defined.
     It means that the code within elf_get_dynamic_info() that uses
     RTLD_BOOTSTRAP is in fact unused.

To fix 1. this patch now includes dynamic-link.h only once with
RTLD_BOOTSTRAP defined.  The ELF_DYNAMIC_RELOCATE call will now have
the relocation fnctions with the expected semantics for the loader.

And to fix 2. part of 4af6982e4c is reverted (the check argument
elf_get_dynamic_info() is not required) and the RTLD_BOOTSTRAP
pieces are removed.

To reorganize the includes the static TLS definition is moved to
its own header to avoid a circular dependency (it is defined on
dynamic-link.h and dl-machine.h requires it at same time other
dynamic-link.h definition requires dl-machine.h defitions).

Also ELF_MACHINE_NO_REL, ELF_MACHINE_NO_RELA, and ELF_MACHINE_PLT_REL
are moved to its own header.  Only ancient ABIs need special values
(arm, i386, and mips), so a generic one is used as default.

The powerpc Elf64_FuncDesc is also moved to its own header, since
csu code required its definition (which would require either include
elf/ folder or add a full path with elf/).

Checked on x86_64, i686, aarch64, armhf, powerpc64, powerpc32,
and powerpc64le.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit d6d89608ac8cf2b37c75debad1fff653f6939f90)

Resolved conflicts:
	elf/rtld.c

2 files changed, 4 insertions, 8 deletions

diff --git a/sysdeps/s390/s390-32/dl-machine.h b/sysdeps/s390/s390-32/dl-machine.h
index 96a5e80c84..ba681d1eac 100644
--- a/sysdeps/s390/s390-32/dl-machine.h
+++ b/sysdeps/s390/s390-32/dl-machine.h
@@ -27,6 +27,8 @@
 #include <link.h>
 #include <sysdeps/s390/dl-procinfo.h>
 #include <dl-irel.h>
+#include <dl-static-tls.h>
+#include <dl-machine-rel.h>
 
 /* This is an older, now obsolete value.  */
 #define EM_S390_OLD	0xA390
@@ -277,10 +279,6 @@ _dl_start_user:\n\
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 #define ELF_MACHINE_JMP_SLOT    R_390_JMP_SLOT
 
-/* The S390 never uses Elf32_Rel relocations.  */
-#define ELF_MACHINE_NO_REL 1
-#define ELF_MACHINE_NO_RELA 0
-
 /* We define an initialization functions.  This is called very early in
    _dl_sysdep_start.  */
 #define DL_PLATFORM_INIT dl_platform_init ()
diff --git a/sysdeps/s390/s390-64/dl-machine.h b/sysdeps/s390/s390-64/dl-machine.h
index c94d09b9c8..af2cffd9f9 100644
--- a/sysdeps/s390/s390-64/dl-machine.h
+++ b/sysdeps/s390/s390-64/dl-machine.h
@@ -28,6 +28,8 @@
 #include <link.h>
 #include <sysdeps/s390/dl-procinfo.h>
 #include <dl-irel.h>
+#include <dl-static-tls.h>
+#include <dl-machine-rel.h>
 
 #define ELF_MACHINE_IRELATIVE       R_390_IRELATIVE
 
@@ -225,10 +227,6 @@ _dl_start_user:\n\
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 #define ELF_MACHINE_JMP_SLOT	R_390_JMP_SLOT
 
-/* The 64 bit S/390 never uses Elf64_Rel relocations.  */
-#define ELF_MACHINE_NO_REL 1
-#define ELF_MACHINE_NO_RELA 0
-
 /* We define an initialization functions.  This is called very early in
    _dl_sysdep_start.  */
 #define DL_PLATFORM_INIT dl_platform_init ()