Blame sysdeps/sparc/sparc64/start.S

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/* Startup code for elf64-sparc
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   Copyright (C) 1997-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   In addition to the permissions in the GNU Lesser General Public
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   License, the Free Software Foundation gives you unlimited
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   permission to link the compiled version of this file with other
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   programs, and to distribute those programs without any restriction
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   coming from the use of this file. (The GNU Lesser General Public
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   License restrictions do apply in other respects; for example, they
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   cover modification of the file, and distribution when not linked
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   into another program.)
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   Note that people who make modified versions of this file are not
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   obligated to grant this special exception for their modified
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   versions; it is their choice whether to do so. The GNU Lesser
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   General Public License gives permission to release a modified
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   version without this exception; this exception also makes it
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   possible to release a modified version which carries forward this
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   exception.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <sysdep.h>
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	.section ".text"
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	.align 4
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	.global _start
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	.type _start,#function
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_start:
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#ifdef PIC
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	SETUP_PIC_REG(l7)
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#endif
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  /* Terminate the stack frame, and reserve space for functions to
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     drop their arguments.  */
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	mov	%g0, %fp
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	sub	%sp, 6*8, %sp
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  /* Extract the arguments and environment as encoded on the stack.  The
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     argument info starts after one register window (16 words) past the SP,
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     plus the bias we added, plus the magic v9 STACK_BIAS.  */
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	ldx	[%sp+STACK_BIAS+22*8], %o1
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	add	%sp, STACK_BIAS+23*8, %o2
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  /* Load the addresses of the user entry points.  */
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#ifndef PIC
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	sethi	%hi(main), %o0
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	sethi	%hi(__libc_csu_init), %o3
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	sethi	%hi(__libc_csu_fini), %o4
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	or	%o0, %lo(main), %o0
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	or	%o3, %lo(__libc_csu_init), %o3
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	or	%o4, %lo(__libc_csu_fini), %o4
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#else
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	sethi	%gdop_hix22(main), %o0
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	sethi	%gdop_hix22(__libc_csu_init), %o3
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	sethi	%gdop_hix22(__libc_csu_fini), %o4
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	xor	%o0, %gdop_lox10(main), %o0
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	xor	%o3, %gdop_lox10(__libc_csu_init), %o3
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	xor	%o4, %gdop_lox10(__libc_csu_fini), %o4
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	ldx	[%l7 + %o0], %o0, %gdop(main)
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	ldx	[%l7 + %o3], %o3, %gdop(__libc_csu_init)
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	ldx	[%l7 + %o4], %o4, %gdop(__libc_csu_fini)
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#endif
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  /* When starting a binary via the dynamic linker, %g1 contains the
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     address of the shared library termination function, which will be
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     registered with atexit().  If we are statically linked, this will
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     be NULL.  */
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	mov     %g1, %o5
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  /* Let libc do the rest of the initialization, and call main.  */
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	call    __libc_start_main
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	 nop
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  /* Die very horribly if exit returns.  */
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	illtrap	0
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	.size _start, .-_start
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/* Define a symbol for the first piece of initialized data.  */
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	.data
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	.globl	__data_start
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__data_start:
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	.long	0
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weak_alias (__data_start, data_start)