Add support for Mach-O thread local variables #68
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This patch adds support for thread local sections, which were previously unimplemented. Specifically, it allows the user to emit sections with the types `S_THREAD_LOCAL_REGULAR` (for `.tdata` and the new `thread_data` section attribute) and `S_THREAD_LOCAL_ZEROFILL` (for `.tbss` and the new `thread_bss/zerofill` attribute). Additionally, it also maps specific section names to the section types `S_THREAD_LOCAL_VARIABLES` (`__thread_vars`), `S_THREAD_LOCAL_VARIABLE_POINTERS` (`__thread_ptrs`) and `S_THREAD_LOCAL_INIT_FUNCTION_POINTERS` (`__thread_init` - note that I couldn't determine how this section type is usually named, so I chose my own name). These special section names don't have an associated Unix section name, yet are sometimes still required when interacting with thread local variables. I hereby sign off the Developer’s Certificate of Origin 1.1.
Contributor
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Has this been reviewed? |
Member
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This is great, but it needs documentation. It might possibly be nicer to use "wrt ..tls" for compatibility with ELF, though. |
Member
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Question: right now we don't have anyone on the NASM team who is familiar with the intricacies of MachO. Would you be able to help with information and/or validation if we need to make changes that affect the MachO backend? |
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This patch adds support for thread local sections, which were previously unimplemented. Specifically, it allows the user to emit sections with the types
S_THREAD_LOCAL_REGULAR(for.tdataand the newthread_datasection attribute) andS_THREAD_LOCAL_ZEROFILL(for.tbssand the newthread_bss/zerofillattribute). Additionally, it also maps specific section names to the section typesS_THREAD_LOCAL_VARIABLES(__thread_vars),S_THREAD_LOCAL_VARIABLE_POINTERS(__thread_ptrs) andS_THREAD_LOCAL_INIT_FUNCTION_POINTERS(__thread_init- note that I couldn't determine how this section type is usually named, so I chose my own name). These special section names don't have an associated Unix section name, yet are sometimes still required when interacting with thread local variables.I hereby sign off the Developer’s Certificate of Origin 1.1.