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-rw-r--r--sysdeps/ia64/_mcount.S90
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-/* Machine-specific calling sequence for `mcount' profiling function.  ia64
-   Copyright (C) 2000-2024 Free Software Foundation, Inc.
-   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
-   <https://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)