8c9863eb1e
In order to run hermetic tests downstream (#145349), we need startup
code. This is based on the crt0 that is present in Arm Toolchain:
5446a3cbf4/arm-software/embedded/llvmlibc-support/crt0.
Note that some tests do fail due to lack of hardware setup, which will
be implemented at a later time.
Most of the CMake/structure is a copy from the existing code in both
`libc/startup/linux` and `libc/startup/gpu`. It is required to build an
object file to be linked with.
Also add header files for init/fini such that crt0 can use the provided
symbols.
---------
Co-authored-by: Michael Jones <michaelrj@google.com>
28 lines
983 B
C++
28 lines
983 B
C++
//===-- Implementation file of __libc_init_array --------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "startup/baremetal/init.h"
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#include "src/__support/macros/config.h"
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#include <stddef.h>
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namespace LIBC_NAMESPACE_DECL {
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using InitCallback = void(void);
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extern "C" void __libc_init_array(void) {
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size_t preinit_array_size = __preinit_array_end - __preinit_array_start;
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for (size_t i = 0; i < preinit_array_size; ++i)
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reinterpret_cast<InitCallback *>(__preinit_array_start[i])();
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size_t init_array_size = __init_array_end - __init_array_start;
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for (size_t i = 0; i < init_array_size; ++i)
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reinterpret_cast<InitCallback *>(__init_array_start[i])();
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}
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} // namespace LIBC_NAMESPACE_DECL
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