| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "asm.h" |
| |
| // Call the C _dl_start, which returns a dl_start_return_t containing the |
| // user entry point and its argument. Then jump to that entry point with |
| // the argument in the first argument register (x0, where it was placed by |
| // the C function's return), clearing the return address and frame pointer |
| // registers so the user entry point is the base of the call stack. |
| |
| .hidden _start |
| ENTRY(_start) |
| bl _dl_start |
| mov x29, #0 // frame pointer (FP) |
| mov x30, #0 // return address (LR) |
| br x1 |
| END(_start) |
