67e58f3941
The tunables framework allows us to uniformly manage and expose global variables inside glibc as switches to users. tunables/README has instructions for glibc developers to add new tunables. Tunables support can be enabled by passing the --enable-tunables configure flag to the configure script. This patch only adds a framework and does not pose any limitations on how tunable values are read from the user. It also adds environment variables used in malloc behaviour tweaking to the tunables framework as a PoC of the compatibility interface. * manual/install.texi: Add --enable-tunables option. * INSTALL: Regenerate. * README.tunables: New file. * Makeconfig (CPPFLAGS): Define TOP_NAMESPACE. (before-compile): Generate dl-tunable-list.h early. * config.h.in: Add HAVE_TUNABLES. * config.make.in: Add have-tunables. * configure.ac: Add --enable-tunables option. * configure: Regenerate. * csu/init-first.c (__libc_init_first): Move __libc_init_secure earlier... * csu/init-first.c (LIBC_START_MAIN):... to here. Include dl-tunables.h, libc-internal.h. (LIBC_START_MAIN) [!SHARED]: Initialize tunables for static binaries. * elf/Makefile (dl-routines): Add dl-tunables. * elf/Versions (ld): Add __tunable_set_val to GLIBC_PRIVATE namespace. * elf/dl-support (_dl_nondynamic_init): Unset MALLOC_CHECK_ only when !HAVE_TUNABLES. * elf/rtld.c (process_envvars): Likewise. * elf/dl-sysdep.c [HAVE_TUNABLES]: Include dl-tunables.h (_dl_sysdep_start): Call __tunables_init. * elf/dl-tunable-types.h: New file. * elf/dl-tunables.c: New file. * elf/dl-tunables.h: New file. * elf/dl-tunables.list: New file. * malloc/tst-malloc-usable-static.c: New test case. * malloc/Makefile (tests-static): Add it. * malloc/arena.c [HAVE_TUNABLES]: Include dl-tunables.h. Define TUNABLE_NAMESPACE. (DL_TUNABLE_CALLBACK (set_mallopt_check)): New function. (DL_TUNABLE_CALLBACK_FNDECL): New macro. Use it to define callback functions. (ptmalloc_init): Set tunable values. * scripts/gen-tunables.awk: New file. * sysdeps/mach/hurd/dl-sysdep.c: Include dl-tunables.h. (_dl_sysdep_start): Call __tunables_init.
78 lines
1.8 KiB
Plaintext
78 lines
1.8 KiB
Plaintext
libc {
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GLIBC_2.0 {
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%ifdef EXPORT_UNWIND_FIND_FDE
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__deregister_frame_info; __register_frame_info;
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%endif
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}
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GLIBC_2.1 {
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# functions used in other libraries
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_dl_mcount_wrapper; _dl_mcount_wrapper_check;
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}
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GLIBC_2.2.4 {
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dl_iterate_phdr;
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}
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%ifdef EXPORT_UNWIND_FIND_FDE
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# Needed for SHLIB_COMPAT calls using this version.
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GLIBC_2.2.5 {
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}
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GCC_3.0 {
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__deregister_frame_info_bases; __register_frame_info_bases;
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__register_frame_info_table_bases; _Unwind_Find_FDE;
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}
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%endif
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GLIBC_PRIVATE {
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# functions used in other libraries
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_dl_addr;
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_dl_open_hook;
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_dl_sym; _dl_vsym;
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__libc_dlclose; __libc_dlopen_mode; __libc_dlsym;
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# Internal error handling support. Interposes the functions in ld.so.
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_dl_signal_error; _dl_catch_error;
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}
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}
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ld {
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GLIBC_2.0 {
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# Functions which are interposed from libc.so.
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calloc; free; malloc; realloc;
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_r_debug;
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}
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GLIBC_2.1 {
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# functions used in other libraries
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_dl_mcount;
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# historically used by Garbage Collectors
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__libc_stack_end;
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}
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GLIBC_2.3 {
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# runtime interface to TLS
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__tls_get_addr;
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}
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GLIBC_2.4 {
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# stack canary
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__stack_chk_guard;
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}
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GLIBC_PRIVATE {
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# Those are in the dynamic linker, but used by libc.so.
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__libc_enable_secure;
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_dl_allocate_tls; _dl_allocate_tls_init;
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_dl_argv; _dl_find_dso_for_object; _dl_get_tls_static_info;
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_dl_deallocate_tls; _dl_make_stack_executable; _dl_out_of_memory;
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_dl_rtld_di_serinfo; _dl_starting_up;
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_rtld_global; _rtld_global_ro;
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# Only here for gdb while a better method is developed.
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_dl_debug_state;
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# Pointer protection.
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__pointer_chk_guard;
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# Internal error handling support. Interposed by libc.so.
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_dl_signal_error; _dl_catch_error;
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# Set value of a tunable.
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__tunable_set_val;
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}
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}
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