Blame sysdeps/sh/start.S

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/* Startup code for SH & ELF.
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   Copyright (C) 1999-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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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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/* This is the canonical entry point, usually the first thing in the text
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   segment.
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	Note that the code in the .init section has already been run.
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	This includes _init and _libc_init
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	At this entry point, most registers' values are unspecified, except:
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   r4		Contains a function pointer to be registered with `atexit'.
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		This is how the dynamic linker arranges to have DT_FINI
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		functions called for shared libraries that have been loaded
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		before this code runs.
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   sp		The stack contains the arguments and environment:
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		0(sp)			argc
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		4(sp)			argv[0]
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		...
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		(4*argc)(sp)		NULL
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		(4*(argc+1))(sp)	envp[0]
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		...
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					NULL
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*/
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	.text
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	.globl _start
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	.type _start,@function
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_start:
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	/* Clear the frame pointer since this is the outermost frame.  */
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	mov #0, r14
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	/* Pop argc off the stack and save a pointer to argv */
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	mov.l @r15+,r5
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	mov r15, r6
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	/* Push the last arguments to main() onto the stack */
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	mov.l r4,@-r15
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	mov.l L_fini,r0
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	mov.l r0,@-r15
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	/* Set up the other arguments for main() that go in registers */
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	mov.l L_main,r4
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	mov.l L_init,r7
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	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini) */
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	/* Let the libc call main and exit with its return code.  */
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	mov.l L_libc_start_main,r1
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	jsr @r1
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	nop
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	/* should never get here....*/
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	mov.l L_abort,r1
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	jsr @r1
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	nop
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	.align	2
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L_main:
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	.long	main
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L_init:
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	.long	__libc_csu_init
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L_fini:
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	.long	__libc_csu_fini
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L_libc_start_main:
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	.long	__libc_start_main
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L_abort:
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	.long	abort
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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 data_start
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	data_start = __data_start
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	.global __fpscr_values
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__fpscr_values:
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	.long   0
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	.long   0x80000