/* Machine-specific calling sequence for `mcount' profiling function.  ia64

   Copyright (C) 2000-2018 Free Software Foundation, Inc.

     Contributed by David Mosberger <davidm@hpl.hp.com>

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* Assembly stub to invoke _mcount().  Compiler generated code calls

   this stub before executing a function's prologue and without saving

   any registers.  It is therefore necessary to preserve the input

   registers as they may contain function arguments.  To work

   correctly with frame-less functions, it is also necessary to

   preserve the return pointer (b0 aka rp).

   State upon entering _mcount:

    r8  address of return value structure (used only when called

	function returns a large structure)

    r15 static link (used only for nested functions)

    in0 ar.pfs to restore before returning to the function that

	called _mcount

    in1 gp value to restore before returning to the function that

	called _mcount

    in2 return address in the function that invoked the caller

	of _mcount (frompc)

    in3	address of the global-offset table entry that holds the

	profile count dword allocated by the compiler; to get

	the address of this dword, use "ld8 in2=[in2]; this

	dword can be used in any way by _mcount (including

	not at all, as is the case with the current implementation)

    b0	address to return to after _mcount is done

*/

#include <sysdep.h>

#undef ret

LEAF(_mcount)

	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)

	alloc loc1 = ar.pfs, 4, 4, 3, 0

	mov loc0 = rp

	.body

	mov loc2 = r8	// gcc uses r8 to pass pointer to return structure

	;;

	mov loc3 = r15	// gcc uses r15 to pass the static link to nested functions

	mov out0 = in2

	mov out1 = rp

	br.call.sptk.few rp = __mcount

	;;

.here:

{

	.mii

	mov gp = in1

	mov r2 = ip

	mov ar.pfs = loc1

}

	;;

	adds r2 = _mcount_ret_helper - .here, r2

	mov b7 = loc0

	mov rp = in2

	;;

	mov r3 = in0

	mov r8 = loc2

	mov r15 = loc3

	mov b6 = r2

	br.ret.sptk.few b6

END(_mcount)

LOCAL_LEAF(_mcount_ret_helper)

	.prologue

	.altrp b7

	.save ar.pfs, r3

	.body

	alloc r2 = ar.pfs, 0, 0, 8, 0

	mov ar.pfs = r3

	br b7

END(_mcount_ret_helper)

weak_alias (_mcount, mcount)