crtbegin.asm

linux下编程用 编译软件

/* Copyright (C) 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
   Contributed by Jes Sorensen, <[e-mail]>

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GCC 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING.  If not, write to
   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

#include "auto-host.h"

.section .ctors,"aw","progbits"
	.align	8
__CTOR_LIST__:
	data8	-1

.section .dtors,"aw","progbits"
	.align	8
__DTOR_LIST__:
	data8	-1

.section .jcr,"aw","progbits"
	.align	8
__JCR_LIST__:

.section .sdata
	.type dtor_ptr,@object
	.size dtor_ptr,8
dtor_ptr:
	data8	@gprel(__DTOR_LIST__ + 8)

	/* A handle for __cxa_finalize to manage c++ local destructors.  */
	.global __dso_handle
	.type __dso_handle,@object
	.size __dso_handle,8
#ifdef SHARED
	.section .data
__dso_handle:
	data8	__dso_handle
#else
	.section .bss
	.align 8
__dso_handle:
	.skip	8
#endif
	.hidden __dso_handle


#ifdef HAVE_INITFINI_ARRAY

.section .fini_array, "a"
	data8 @fptr(__do_global_dtors_aux)

.section .init_array, "a"
	data8 @fptr(__do_jv_register_classes)
	data8 @fptr(__do_global_ctors_aux)

#else /* !HAVE_INITFINI_ARRAY */
/*
 * Fragment of the ELF _fini routine that invokes our dtor cleanup.
 *
 * We make the call by indirection, because in large programs the 
 * .fini and .init sections are not in range of the destination, and
 * we cannot allow the linker to insert a stub at the end of this
 * fragment of the _fini function.  Further, Itanium does not implement
 * the long branch instructions, and we do not wish every program to
 * trap to the kernel for emulation.
 *
 * Note that we require __do_global_dtors_aux to preserve the GP,
 * so that the next fragment in .fini gets the right value.
 */
.section .fini,"ax","progbits"
	{ .mlx
	  movl r2 = @pcrel(__do_global_dtors_aux - 16)
	}
	{ .mii
	  mov r3 = ip
	  ;;
	  add r2 = r2, r3
	  ;;
	}
	{ .mib
	  nop 0
	  mov b6 = r2
	  br.call.sptk.many b0 = b6
	}

/* Likewise for _init.  */

.section .init,"ax","progbits"
	{ .mlx
	  movl r2 = @pcrel(__do_jv_register_classes - 16)
	}
	{ .mii
	  mov r3 = ip
	  ;;
	  add r2 = r2, r3
	  ;;
	}
	{ .mib
	  nop 0
	  mov b6 = r2
	  br.call.sptk.many b0 = b6
	}
#endif /* !HAVE_INITFINI_ARRAY */

.section .text
	.align	32
	.proc	__do_global_dtors_aux
__do_global_dtors_aux:
	.prologue
#ifndef SHARED
	.save ar.pfs, r35
	alloc loc3 = ar.pfs, 0, 4, 1, 0
	addl loc0 = @gprel(dtor_ptr), gp
	.save rp, loc1
	mov loc1 = rp
	.body

	mov loc2 = gp
	nop 0
	br.sptk.many .entry
#else
	/*
		if (__cxa_finalize)
		  __cxa_finalize(__dso_handle)
	*/
	.save ar.pfs, r35
	alloc loc3 = ar.pfs, 0, 4, 1, 0
	addl loc0 = @gprel(dtor_ptr), gp
	addl r16 = @ltoff(@fptr(__cxa_finalize)), gp
	;;

	ld8 r16 = [r16]
	;;
	addl out0 = @ltoff(__dso_handle), gp
	cmp.ne p7, p0 = r0, r16
	;;

	ld8 out0 = [out0]
(p7)	ld8 r18 = [r16], 8
	.save rp, loc1
	mov loc1 = rp
	.body
	;;

	mov loc2 = gp
(p7)	ld8 gp = [r16]
(p7)	mov b6 = r18

	nop 0
	nop 0
(p7)	br.call.sptk.many rp = b6
	;;

	nop 0
	nop 0
	br.sptk.many .entry
#endif
	/*
		do {
		  dtor_ptr++;
		  (*(dtor_ptr-1)) ();
		} while (dtor_ptr);
	*/
.loop:
	st8 [loc0] = r15		// update dtor_ptr (in memory)
	ld8 r17 = [r16], 8		// r17 <- dtor's entry-point
	nop 0
	;;

	ld8 gp = [r16]			// gp <- dtor's gp
	mov b6 = r17
	br.call.sptk.many rp = b6

.entry:	ld8 r15 = [loc0]		// r15 <- dtor_ptr (gp-relative)
	;;
	add r16 = r15, loc2		// r16 <- dtor_ptr (absolute)
	adds r15 = 8, r15
	;;

	ld8 r16 = [r16]			// r16 <- pointer to dtor's fdesc
	mov rp = loc1
	mov ar.pfs = loc3
	;;

	cmp.ne p6, p0 = r0, r16
(p6)	br.cond.sptk.few .loop
	br.ret.sptk.many rp
	.endp __do_global_dtors_aux

	.align	32
	.proc	__do_jv_register_classes
__do_jv_register_classes:
	.prologue
	.save ar.pfs, r33
	alloc loc1 = ar.pfs, 0, 3, 1, 0
	movl out0 = @gprel(__JCR_LIST__)
	;;

	addl r14 = @ltoff(@fptr(_Jv_RegisterClasses)), gp
	add out0 = out0, gp
	.save rp, loc0
	mov loc0 = rp
	.body
	;;

	ld8 r14 = [r14]
	ld8 r15 = [out0]
	cmp.ne p6, p0 = r0, r0
	;;

	cmp.eq.or p6, p0 = r0, r14
	cmp.eq.or p6, p0 = r0, r15
(p6)	br.ret.sptk.many rp

	ld8 r15 = [r14], 8
	;;
	nop 0
	mov b6 = r15

	mov loc2 = gp
	ld8 gp = [r14]
	br.call.sptk.many rp = b6
	;;

	mov gp = loc2
	mov rp = loc0
	mov ar.pfs = loc1

	nop 0
	nop 0
	br.ret.sptk.many rp
	.endp	__do_jv_register_classes

#ifdef SHARED
.weak __cxa_finalize
#endif
.weak _Jv_RegisterClasses