mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 00:01:12 +00:00
100 lines
2.7 KiB
ArmAsm
100 lines
2.7 KiB
ArmAsm
|
/* start, OpenRISC version.
|
||
|
|
Copyright (C) 2022 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, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
/* This is the canonical entry point, usually the first thing in the text
|
||
|
|
segment.
|
||
|
|
|
||
|
|
sp The stack contains the arguments and environment:
|
||
|
|
0(sp) argc
|
||
|
|
4(sp) argv[0]
|
||
|
|
...
|
||
|
|
(4*argc)(sp) NULL
|
||
|
|
(4*(argc+1))(sp) envp[0]
|
||
|
|
...
|
||
|
|
NULL
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define __ASSEMBLY__
|
||
|
|
#include <sysdep.h>
|
||
|
|
#include <entry.h>
|
||
|
|
|
||
|
|
ENTRY (ENTRY_POINT)
|
||
|
|
|
||
|
|
/* Setup Arguments to the __libc_start_main function. */
|
||
|
|
|
||
|
|
/* Take values for argc and argv off the stack.
|
||
|
|
These will be passed as arguments two and three to main
|
||
|
|
and thus go in registers r4 and r5, respectively. */
|
||
|
|
l.lwz r4, 0(r1)
|
||
|
|
l.addi r5, r1, 4
|
||
|
|
|
||
|
|
/* Pass in rtld_fini from dl-start.S. */
|
||
|
|
l.or r8, r3, r3
|
||
|
|
|
||
|
|
#ifdef PIC
|
||
|
|
/* Obtain a pointer to .got in r16 */
|
||
|
|
l.jal 0x8
|
||
|
|
l.movhi r16, gotpchi(_GLOBAL_OFFSET_TABLE_-4)
|
||
|
|
l.ori r16, r16, gotpclo(_GLOBAL_OFFSET_TABLE_+0)
|
||
|
|
l.add r16, r16, r9
|
||
|
|
|
||
|
|
/* Pass in the the main symbol. */
|
||
|
|
l.lwz r3, got(main)(r16)
|
||
|
|
#else
|
||
|
|
/* Pass in the the main symbol. */
|
||
|
|
l.movhi r3, hi(main)
|
||
|
|
l.ori r3, r3, lo(main)
|
||
|
|
#endif
|
||
|
|
/* Used to be init and fini. */
|
||
|
|
l.movhi r6, 0x0
|
||
|
|
l.movhi r7, 0x0
|
||
|
|
|
||
|
|
/* Push stack limit onto the stack.
|
||
|
|
This provides the highest stack address to user code (as stack grows
|
||
|
|
downwards.
|
||
|
|
This is the seventh argument to __libc_start_main and thus needs to
|
||
|
|
be passed on the stack. */
|
||
|
|
l.sw -4(r1), r1
|
||
|
|
|
||
|
|
/* Adjust stack to account for a total of 7 args (i.e. the last one is
|
||
|
|
on the stack. */
|
||
|
|
l.addi r1, r1, -4
|
||
|
|
|
||
|
|
/* Clear the frame pointer and link register since this is the
|
||
|
|
outermost frame. */
|
||
|
|
l.movhi r2, 0x0
|
||
|
|
l.movhi r9, 0x0
|
||
|
|
|
||
|
|
/* Let the libc call main and exit with its return code. */
|
||
|
|
#ifdef PIC
|
||
|
|
l.j plt(__libc_start_main)
|
||
|
|
#else
|
||
|
|
l.j __libc_start_main
|
||
|
|
#endif
|
||
|
|
l.nop
|
||
|
|
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
|