9e78f6f6e7
This change moves the main implementation of _dl_catch_error, _dl_signal_error to libc.so, where TLS variables can be used directly. This removes a writable function pointer from the rtld_global variable. For use during initial relocation, minimal implementations of these functions are provided in ld.so. These are eventually interposed by the libc.so implementations. This is implemented by compiling elf/dl-error-skeleton.c twice, via elf/dl-error.c and elf/dl-error-minimal.c. As a side effect of this change, the static version of dl-error.c no longer includes support for the _dl_signal_cerror/_dl_receive_error mechanism because it is only used in ld.so.
23 lines
1.1 KiB
Plaintext
23 lines
1.1 KiB
Plaintext
# See scripts/check-localplt.awk for how this file is processed.
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# PLT use is required for the malloc family and for matherr because
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# users can define their own functions and have library internals call them.
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# Linker in binutils 2.26 and newer consolidates R_X86_64_JUMP_SLOT
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# relocation with R_X86_64_GLOB_DAT relocation against the same symbol.
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libc.so: calloc + RELA R_X86_64_GLOB_DAT
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libc.so: free + RELA R_X86_64_GLOB_DAT
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libc.so: malloc + RELA R_X86_64_GLOB_DAT
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libc.so: memalign + RELA R_X86_64_GLOB_DAT
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libc.so: realloc + RELA R_X86_64_GLOB_DAT
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libm.so: matherr
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# The dynamic loader uses __libc_memalign internally to allocate aligned
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# TLS storage. The other malloc family of functions are expected to allow
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# user symbol interposition.
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ld.so: __libc_memalign + RELA R_X86_64_GLOB_DAT
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ld.so: malloc + RELA R_X86_64_GLOB_DAT
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ld.so: calloc + RELA R_X86_64_GLOB_DAT
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ld.so: realloc + RELA R_X86_64_GLOB_DAT
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ld.so: free + RELA R_X86_64_GLOB_DAT
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# The TLS-enabled version of these functions is interposed from libc.so.
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ld.so: _dl_signal_error + RELA R_X86_64_GLOB_DAT
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ld.so: _dl_catch_error + RELA R_X86_64_GLOB_DAT
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