109 lines
3.2 KiB
ArmAsm
109 lines
3.2 KiB
ArmAsm
/* Startup code compliant to the ELF C-SKY ABIV2.
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Copyright (C) 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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/* We need to call:
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__libc_start_main (int (*main) (int, char **, char **), int argc,
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char **argv, void (*init) (void), void (*fini) (void),
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void (*rtld_fini) (void), void *stack_end)
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*/
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#include <sysdep.h>
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.text
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.globl _start;
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.type _start,@function;
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.align 4;
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_start:
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subi sp, 8
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/* Clear the link register since this is the outermost frame. */
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movi lr, 0
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/* Pop argc off the stack and save a pointer to argv. */
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ldw a1, (sp, 8) /* Init argc for __libc_start_main. */
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addi a2, sp, 12 /* Init argv for __libc_start_main. */
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/* Push stack limit. */
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stw a2, (sp, 8)
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/* Push rtld_fini. */
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stw a0, (sp, 4)
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#ifdef SHARED
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grs t0, .Lgetpc
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.Lgetpc:
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lrw gb, .Lgetpc@GOTPC
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addu gb, t0
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lrw a3, __libc_csu_fini@GOT
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ldr.w a3, (gb, a3 << 0)
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stw a3, (sp, 0)
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lrw a3, __libc_csu_init@GOT
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addu a3, gb
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ldw a3, (a3, 0)
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lrw t0, main@GOT
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addu t0, gb
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ldw a0, (t0, 0)
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lrw t1, __libc_start_main@PLT
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ldr.w t1, (gb, t1 << 0)
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jsr t1
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lrw t1, abort@PLT
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ldr.w t1, (gb, t1 << 0)
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jsr t1
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#else
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/* Fetch address of __libc_csu_fini. */
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lrw a0, __libc_csu_fini
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/* Push __libc_csu_fini */
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stw a0, (sp, 0)
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/* Set up the other arguments in registers. */
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lrw a0, main
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lrw a3, __libc_csu_init
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/* Let the libc call main and exit with its return code. */
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jsri __libc_start_main
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/* Should never get here. */
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jsri abort
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#endif /* !SHARED */
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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 data_start
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data_start = __data_start
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