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031e519c95
This change forces realignment of the stack pointer in __tls_get_addr, so that binaries compiled by GCCs older than GCC 4.9: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066 continue to work even if vector instructions are used in glibc which require the ABI stack realignment. __tls_get_addr_slow is added to handle the slow paths in the default implementation of__tls_get_addr in elf/dl-tls.c. The new __tls_get_addr calls __tls_get_addr_slow after realigning the stack. Internal calls within ld.so go directly to the default implementation of __tls_get_addr because they do not need stack realignment. [BZ #21609] * sysdeps/x86_64/Makefile (sysdep-dl-routines): Add tls_get_addr. (gen-as-const-headers): Add rtld-offsets.sym. * sysdeps/x86_64/dl-tls.c: New file. * sysdeps/x86_64/rtld-offsets.sym: Likwise. * sysdeps/x86_64/tls_get_addr.S: Likewise. * sysdeps/x86_64/dl-tls.h: Add multiple inclusion guards. * sysdeps/x86_64/tlsdesc.sym (TI_MODULE_OFFSET): New. (TI_OFFSET_OFFSET): Likwise.
21 lines
587 B
Plaintext
21 lines
587 B
Plaintext
#include <stddef.h>
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#include <sysdep.h>
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#include <tls.h>
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#include <link.h>
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#include <dl-tlsdesc.h>
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--
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-- Abuse tls.h macros to derive offsets relative to the thread register.
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DTV_OFFSET offsetof(struct pthread, header.dtv)
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TLSDESC_ARG offsetof(struct tlsdesc, arg)
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TLSDESC_GEN_COUNT offsetof(struct tlsdesc_dynamic_arg, gen_count)
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TLSDESC_MODID offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_module)
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TLSDESC_MODOFF offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_offset)
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TI_MODULE_OFFSET offsetof(tls_index, ti_module)
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TI_OFFSET_OFFSET offsetof(tls_index, ti_offset)
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