libc/startup/linux/riscv/start.cpp

   1 //===-- Implementation of _start for riscv --------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 #include "src/__support/macros/attributes.h"
   9 #include "startup/linux/do_start.h"
  10
  11 extern "C" [[noreturn]] void _start() {
  12   asm volatile(".option push\n\t"
  13                ".option norelax\n\t"
  14                "lla gp, __global_pointer$\n\t"
  15                ".option pop\n\t");
  16   // Fetch the args using the frame pointer.
  17   LIBC_NAMESPACE::app.args = reinterpret_cast<LIBC_NAMESPACE::Args *>(
  18       reinterpret_cast<uintptr_t *>(__builtin_frame_address(0)));
  19   LIBC_NAMESPACE::do_start();
  20 }