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5d28a8962d
It can be used to speed up the libgcc unwinder, and the internal _dl_find_dso_for_object function (which is used for caller identification in dlopen and related functions, and in dladdr). _dl_find_object is in the internal namespace due to bug 28503. If libgcc switches to _dl_find_object, this namespace issue will be fixed. It is located in libc for two reasons: it is necessary to forward the call to the static libc after static dlopen, and there is a link ordering issue with -static-libgcc and libgcc_eh.a because libc.so is not a linker script that includes ld.so in the glibc build tree (so that GCC's internal -lc after libgcc_eh.a does not pick up ld.so). It is necessary to do the i386 customization in the sysdeps/x86/bits/dl_find_object.h header shared with x86-64 because otherwise, multilib installations are broken. The implementation uses software transactional memory, as suggested by Torvald Riegel. Two copies of the supporting data structures are used, also achieving full async-signal-safety. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
81 lines
1.9 KiB
Plaintext
81 lines
1.9 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_2.35 {
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_dl_find_object;
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}
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GLIBC_PRIVATE {
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# functions used in other libraries
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__libc_early_init;
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# Internal error handling support. Interposes the functions in ld.so.
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_dl_signal_exception; _dl_catch_exception;
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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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_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;
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_dl_rtld_di_serinfo; _dl_starting_up; _dl_fatal_printf;
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_dl_audit_symbind_alt; _dl_audit_preinit;
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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.
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_dl_exception_create; _dl_exception_create_format; _dl_exception_free;
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# Internal error handling support. Interposed by libc.so.
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_dl_signal_exception; _dl_catch_exception;
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_dl_signal_error; _dl_catch_error;
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# Set value of a tunable.
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__tunable_get_val;
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}
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}
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