mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
dd2e6ef179
Code for C runtime startup and dynamic loading including PLT layout. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
75 lines
2.0 KiB
ArmAsm
75 lines
2.0 KiB
ArmAsm
/* Startup code for ARC.
|
|
Copyright (C) 2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#define __ASSEMBLY__ 1
|
|
#include <entry.h>
|
|
#include <sysdep.h>
|
|
|
|
#ifndef ENTRY_POINT
|
|
# error ENTRY_POINT needs to be defined for ARC
|
|
#endif
|
|
|
|
/* When we enter this piece of code, the program stack looks like this:
|
|
argc argument counter (integer)
|
|
argv[0] program name (pointer)
|
|
argv[1...N] program args (pointers)
|
|
argv[argc-1] end of args (integer)
|
|
NULL
|
|
env[0...N] environment variables (pointers)
|
|
NULL. */
|
|
|
|
ENTRY (ENTRY_POINT)
|
|
|
|
/* Needed to make gdb backtraces stop here. */
|
|
.cfi_label .Ldummy
|
|
cfi_undefined (blink)
|
|
|
|
mov fp, 0
|
|
ld_s r1, [sp] /* argc. */
|
|
|
|
mov_s r5, r0 /* rltd_fini. */
|
|
add_s r2, sp, 4 /* argv. */
|
|
and sp, sp, -8
|
|
mov r6, sp
|
|
|
|
/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end). */
|
|
|
|
#ifdef SHARED
|
|
ld r0, [pcl, @main@gotpc]
|
|
ld r3, [pcl, @__libc_csu_init@gotpc]
|
|
ld r4, [pcl, @__libc_csu_fini@gotpc]
|
|
bl __libc_start_main@plt
|
|
#else
|
|
mov_s r0, main
|
|
mov_s r3, __libc_csu_init
|
|
mov r4, __libc_csu_fini
|
|
bl __libc_start_main
|
|
#endif
|
|
|
|
/* Should never get here. */
|
|
flag 1
|
|
END (ENTRY_POINT)
|
|
|
|
/* Define a symbol for the first piece of initialized data. */
|
|
.data
|
|
.globl __data_start
|
|
__data_start:
|
|
.long 0
|
|
.weak data_start
|
|
data_start = __data_start
|