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Introduce <elf-initfini.h> and ELF_INITFINI for all architectures

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This supersedes the init_array sysdeps directory.  It allows us to
check for ELF_INITFINI in both C and assembler code, and skip DT_INIT
and DT_FINI processing completely on newer architectures.

A new header file is needed because <dl-machine.h> is incompatible
with assembler code.  <sysdep.h> is compatible with assembler code,
but it cannot be included in all assembler files because on some
architectures, it redefines register names, and some assembler files
conflict with that.

<elf-initfini.h> is replicated for legacy architectures which need
DT_INIT/DT_FINI support.  New architectures follow the generic default
and disable it.
This commit is contained in:
Florian Weimer
2020-02-18 14:42:41 +01:00
parent 6e05978f0c
commit f4349837d9
26 changed files with 330 additions and 105 deletions
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8
elf/dl-init.c
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@ -18,6 +18,7 @@
#include <stddef.h>
#include <ldsodefs.h>
#include <elf-initfini.h>
/* Type of the initializer. */
@ -40,11 +41,6 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
&& l->l_type == lt_executable)
return;
/* Are there any constructors? */
if (l->l_info[DT_INIT] == NULL
&& __builtin_expect (l->l_info[DT_INIT_ARRAY] == NULL, 1))
return;
/* Print a debug message if wanted. */
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
_dl_debug_printf ("\ncalling init: %s\n\n",
@ -54,7 +50,7 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
- the one named by DT_INIT
- the others in the DT_INIT_ARRAY.
*/
if (l->l_info[DT_INIT] != NULL)
if (ELF_INITFINI && l->l_info[DT_INIT] != NULL)
DL_CALL_DT_INIT(l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr, argc, argv, env);
/* Next see whether there is an array with initialization functions. */