| /* 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) |