2bc994456c
* separate initialization routines into _start and do_start for all architectures. * lift do_start as a separate object library to avoid code duplication. * (addtionally) address the problem of building hermetic libc with -fstack-pointer-* The `crt1.o` is now a merged result of three components: ``` ___ |___ x86_64 | |_______ start.cpp.o <- _start (loads process initial stack and aligns stack pointer) | |_______ tls.cpp.o <- init_tls, cleanup_tls, set_thread_pointer (TLS related routines) |___ do_start.cpp.o <- do_start (sets up global variables and invokes the main function) ```
21 lines
858 B
C++
21 lines
858 B
C++
//===-- Implementation of _start for riscv --------------------------------===//
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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 "src/__support/macros/attributes.h"
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#include "startup/linux/do_start.h"
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extern "C" [[noreturn]] void _start() {
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asm volatile(".option push\n\t"
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".option norelax\n\t"
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"lla gp, __global_pointer$\n\t"
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".option pop\n\t");
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// Fetch the args using the frame pointer.
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LIBC_NAMESPACE::app.args = reinterpret_cast<LIBC_NAMESPACE::Args *>(
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reinterpret_cast<uintptr_t *>(__builtin_frame_address(0)));
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LIBC_NAMESPACE::do_start();
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}
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