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https://github.com/RGBCube/serenity
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ad9e674fa0
This is a prerequisite for upstreaming our LLVM patches, as our current hack forcing `-ftls-model=initial-exec` in the Clang driver is not acceptable upstream. Currently, our kernel-managed TLS implementation limits us to only having a single block of storage for all thread-local variables that's initialized at load time. This PR merely implements the dynamic TLS interface (`__tls_get_addr` and TLSDESC) on top of our static TLS infrastructure. The current model's limitations still stand: - a single static TLS block is reserved at load time, `dlopen()`-ing shared libraries that define thread-local variables might cause us to run out of space. - the initial TLS image is not changeable post-load, so `dlopen()`-ing libraries with non-zero-initialized TLS variables is not supported. The way we repurpose `ti_module` to mean "offset within static TLS block" instead of "module index" is not ABI-compliant.
39 lines
957 B
C
39 lines
957 B
C
/*
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* Copyright (c) 2020-2023, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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typedef void (*AtExitFunction)(void*);
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extern void __libc_init(void);
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extern void __malloc_init(void);
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extern void __stdio_init(void);
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extern void __begin_atexit_locking(void);
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extern void _init(void);
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extern bool __environ_is_malloced;
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extern bool __stdio_is_initialized;
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extern bool __heap_is_stable;
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extern void* __auxiliary_vector;
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int __cxa_atexit(AtExitFunction exit_function, void* parameter, void* dso_handle);
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void __cxa_finalize(void* dso_handle);
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__attribute__((noreturn)) void __cxa_pure_virtual(void) __attribute__((weak));
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__attribute__((noreturn)) void __stack_chk_fail(void);
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__attribute__((noreturn)) void __stack_chk_fail_local(void);
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struct __tls_index {
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size_t ti_module;
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size_t ti_offset;
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};
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void* __tls_get_addr(__tls_index*);
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__END_DECLS
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