135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/* Support for cris*-axis-linux-gnu and src/sim/cris simulator.
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Copyright (C) 2000-2005, 2017 Axis Communications.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Neither the name of Axis Communications nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY AXIS COMMUNICATIONS AND ITS CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AXIS
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COMMUNICATIONS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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#include "linunistd.h"
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#include "newlib.h"
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#ifdef HAVE_INITFINI_ARRAY
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#define _init __libc_init_array
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#define _fini __libc_fini_array
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#endif
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extern void exit (int) __attribute ((__noreturn__));
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__asm__ (".syntax no_register_prefix");
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#ifdef __ELF__
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/* This simulator magic for an earlier simulator was supposed to be
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found two bytes before _start. Let's keep it for sake of
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compatibility. Trying to emit them with an ordinary const char[]
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and attribute section makes gcc barf; it doesn't like having the
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same section attribute for both code and data.
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The code is supposed to cause a crash if someone jumps to 0. */
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__asm__
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(
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" .section .startup,\"ax\",@progbits\n"
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" .byte 55,55\n"
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" move.d 0xbadacce5,r9\n"
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" clear.d [r9]\n"
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" setf\n"
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" setf\n"
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" .previous");
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#endif
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__asm__
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(
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#ifdef __AOUT__
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" .text\n\t"
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#elif defined (__ELF__)
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" .section .startup,\"ax\",@progbits\n"
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#endif
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" .global __start\n"
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"__start:\n"
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/* SP must be set up by the simulator or the system. */
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/* Find ARGC, ARGV and ENV. */
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/* ARGC. */
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" move.d [sp],r10\n"
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/* ARGV. */
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" move.d sp,r11\n"
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" addq 4,r11\n"
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/* ENVP. */
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" move.d sp,r12\n"
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" addi r10.d,r12\n"
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" addq 8,r12\n"
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/* Terminate R9 and R6; we don't have a "console_print_etrax" or system
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call function. */
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" clear.d r9\n"
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" clear.d r6\n"
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" move.d __start1,r13\n"
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" jump r13\n"
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" setf\n"
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#ifndef __AOUT__
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/* We rely on a.out not being in .data here. Quite fragile, but
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covered by e.g. running the GCC test-suite for cris-unknown-aout. */
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" .previous"
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#endif
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);
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extern void _Libctors (void);
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extern void _Libdtors (void);
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extern void __init__start (void) __attribute ((weak));
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extern void __aout__ctors (void) __attribute ((weak));
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static void start1 () __asm__ ("__start1") __attribute ((__used__));
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static void
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start1 (int argc, char **argv, char **env)
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{
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#ifdef __ELF__
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/* For ELF systems, we call _init and register _fini with atexit. */
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{
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extern void _init (void);
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extern void _fini (void);
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_init ();
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if (atexit (_fini) != 0)
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exit (-1);
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}
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#else
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/* Constructors which may get here through the ELF .init section, when
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linking ELF and producing a.out. */
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if (__init__start)
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__init__start ();
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if (__aout__ctors)
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__aout__ctors ();
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/* Call constructors in shared libraries. */
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_Libctors ();
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if (atexit (_Libdtors) != 0)
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exit (-1);
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#endif
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/* Call the user program. */
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exit (main (argc, argv, env));
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}
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