1/* Startup code compliant to the ELF C-SKY ABIV2.
  2   Copyright (C) 2018-2021 Free Software Foundation, Inc.
  3   This file is part of the GNU C Library.
  4
  5   The GNU C Library is free software; you can redistribute it and/or
  6   modify it under the terms of the GNU Lesser General Public
  7   License as published by the Free Software Foundation; either
  8   version 2.1 of the License, or (at your option) any later version.
  9
 10   In addition to the permissions in the GNU Lesser General Public
 11   License, the Free Software Foundation gives you unlimited
 12   permission to link the compiled version of this file with other
 13   programs, and to distribute those programs without any restriction
 14   coming from the use of this file. (The GNU Lesser General Public
 15   License restrictions do apply in other respects; for example, they
 16   cover modification of the file, and distribution when not linked
 17   into another program.)
 18
 19   Note that people who make modified versions of this file are not
 20   obligated to grant this special exception for their modified
 21   versions; it is their choice whether to do so. The GNU Lesser
 22   General Public License gives permission to release a modified
 23   version without this exception; this exception also makes it
 24   possible to release a modified version which carries forward this
 25   exception.
 26
 27   The GNU C Library is distributed in the hope that it will be useful,
 28   but WITHOUT ANY WARRANTY; without even the implied warranty of
 29   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 30   Lesser General Public License for more details.
 31
 32   You should have received a copy of the GNU Lesser General Public
 33   License along with the GNU C Library.  If not, see
 34   <https://www.gnu.org/licenses/>.  */
 35
 36/* We need to call:
 37   __libc_start_main (int (*main) (int, char **, char **), int argc,
 38		      char **argv, void (*init) (void), void (*fini) (void),
 39		      void (*rtld_fini) (void), void *stack_end)
 40 */
 41
 42#include <sysdep.h>
 43
 44	.text
 45	.globl _start;
 46	.type _start,@function;
 47	.align 4;
 48_start:
 49	cfi_startproc
 50	.cfi_label .Ldummy
 51	cfi_undefined (lr)
 52	subi	sp, 8
 53	/* Clear the link register since this is the outermost frame.  */
 54	movi	lr, 0
 55	/* Pop argc off the stack and save a pointer to argv.  */
 56	ldw	a1, (sp, 8)	/* Init argc for __libc_start_main.  */
 57	addi	a2, sp, 12	/* Init argv for __libc_start_main.  */
 58
 59	/* Push stack limit.  */
 60	stw	a2, (sp, 8)
 61	/* Push rtld_fini.  */
 62	stw	a0, (sp, 4)
 63
 64#ifdef SHARED
 65	grs	t0, .Lgetpc
 66.Lgetpc:
 67	lrw	gb, .Lgetpc@GOTPC
 68	addu	gb, t0
 69	lrw	a3, __libc_csu_fini@GOT
 70	ldr.w	a3, (gb, a3 << 0)
 71	stw	a3, (sp, 0)
 72
 73	lrw	a3, __libc_csu_init@GOT
 74	addu	a3, gb
 75	ldw	a3, (a3, 0)
 76
 77	lrw	t0, main@GOT
 78	addu	t0, gb
 79	ldw	a0, (t0, 0)
 80	lrw	t1, __libc_start_main@PLT
 81	ldr.w	t1, (gb, t1 << 0)
 82	jsr	t1
 83
 84	lrw	t1, abort@PLT
 85	ldr.w	t1, (gb, t1 << 0)
 86	jsr	t1
 87#else
 88	/* Fetch address of __libc_csu_fini.  */
 89	lrw	a0, __libc_csu_fini
 90	/* Push __libc_csu_fini */
 91	stw	a0, (sp, 0)
 92
 93	/* Set up the other arguments in registers.  */
 94	lrw	a0, main
 95	lrw	a3, __libc_csu_init
 96	/* Let the libc call main and exit with its return code.  */
 97	jsri	__libc_start_main
 98
 99	/* Should never get here.  */
100	jsri	abort
101#endif	/* !SHARED */
102	cfi_endproc
103	.size _start,.-_start
104
105
106	/* Define a symbol for the first piece of initialized data.  */
107	.data
108	.globl __data_start
109__data_start:
110	.long 0
111	.weak data_start
112	data_start = __data_start