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>

2 files changed, 4 insertions, 8 deletions

diff --git a/sysdeps/sparc/sparc32/dl-machine.h b/sysdeps/sparc/sparc32/dl-machine.h
index 6361cfae9e..78f53bc499 100644
--- a/sysdeps/sparc/sparc32/dl-machine.h
+++ b/sysdeps/sparc/sparc32/dl-machine.h
@@ -28,6 +28,8 @@
 #include <tls.h>
 #include <dl-plt.h>
 #include <elf/dl-hwcaps.h>
+#include <dl-static-tls.h>
+#include <dl-machine-rel.h>
 
 /* Return nonzero iff ELF header is compatible with the running host.  */
 static inline int
@@ -196,10 +198,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 #define ELF_MACHINE_JMP_SLOT	R_SPARC_JMP_SLOT
 
-/* The SPARC never uses Elf32_Rel relocations.  */
-#define ELF_MACHINE_NO_REL 1
-#define ELF_MACHINE_NO_RELA 0
-
 /* Undo the sub %sp, 6*4, %sp; add %sp, 22*4, %o0 below to get at the
    value we want in __libc_stack_end.  */
 #define DL_STACK_END(cookie) \
diff --git a/sysdeps/sparc/sparc64/dl-machine.h b/sysdeps/sparc/sparc64/dl-machine.h
index 3fd18c6e5e..3fa79d038f 100644
--- a/sysdeps/sparc/sparc64/dl-machine.h
+++ b/sysdeps/sparc/sparc64/dl-machine.h
@@ -26,6 +26,8 @@
 #include <ldsodefs.h>
 #include <sysdep.h>
 #include <dl-plt.h>
+#include <dl-static-tls.h>
+#include <dl-machine-rel.h>
 
 #define ELF64_R_TYPE_ID(info)	((info) & 0xff)
 #define ELF64_R_TYPE_DATA(info) ((info) >> 8)
@@ -118,10 +120,6 @@ elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
 #define ELF_MACHINE_JMP_SLOT	R_SPARC_JMP_SLOT
 
-/* The SPARC never uses Elf64_Rel relocations.  */
-#define ELF_MACHINE_NO_REL 1
-#define ELF_MACHINE_NO_RELA 0
-
 /* Set up the loaded object described by L so its unrelocated PLT
    entries will jump to the on-demand fixup code in dl-runtime.c.  */