projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d5efd131 | 1 | /* Machine-specific calling sequence for `mcount' profiling function. ia64 |
| d4697bc9 | 2 | Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| d5efd131 MF |
3 | Contributed by David Mosberger <davidm@hpl.hp.com> |
| 4 | This file is part of the GNU C Library. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 75efb018 MF |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| d5efd131 MF |
19 | |
| 20 | /* Assembly stub to invoke _mcount(). Compiler generated code calls | |
| 21 | this stub before executing a function's prologue and without saving | |
| 22 | any registers. It is therefore necessary to preserve the input | |
| 23 | registers as they may contain function arguments. To work | |
| 24 | correctly with frame-less functions, it is also necessary to | |
| 25 | preserve the return pointer (b0 aka rp). | |
| 26 | ||
| 27 | State upon entering _mcount: | |
| 28 | ||
| 29 | r8 address of return value structure (used only when called | |
| 30 | function returns a large structure) | |
| 31 | r15 static link (used only for nested functions) | |
| 32 | in0 ar.pfs to restore before returning to the function that | |
| 33 | called _mcount | |
| 34 | in1 gp value to restore before returning to the function that | |
| 35 | called _mcount | |
| 36 | in2 return address in the function that invoked the caller | |
| 37 | of _mcount (frompc) | |
| 38 | in3 address of the global-offset table entry that holds the | |
| 39 | profile count dword allocated by the compiler; to get | |
| 40 | the address of this dword, use "ld8 in2=[in2]; this | |
| 41 | dword can be used in any way by _mcount (including | |
| 42 | not at all, as is the case with the current implementation) | |
| 43 | b0 address to return to after _mcount is done | |
| 44 | */ | |
| 45 | ||
| 46 | #include <sysdep.h> | |
| 47 | ||
| 48 | #undef ret | |
| 49 | ||
| 50 | LEAF(_mcount) | |
| 51 | .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4) | |
| 52 | alloc loc1 = ar.pfs, 4, 4, 3, 0 | |
| 53 | mov loc0 = rp | |
| 54 | .body | |
| 55 | mov loc2 = r8 // gcc uses r8 to pass pointer to return structure | |
| 56 | ;; | |
| 57 | mov loc3 = r15 // gcc uses r15 to pass the static link to nested functions | |
| 58 | mov out0 = in2 | |
| 59 | mov out1 = rp | |
| 60 | br.call.sptk.few rp = __mcount | |
| 61 | ;; | |
| 62 | .here: | |
| 63 | { | |
| 64 | .mii | |
| 65 | mov gp = in1 | |
| 66 | mov r2 = ip | |
| 67 | mov ar.pfs = loc1 | |
| 68 | } | |
| 69 | ;; | |
| 70 | adds r2 = _mcount_ret_helper - .here, r2 | |
| 71 | mov b7 = loc0 | |
| 72 | mov rp = in2 | |
| 73 | ;; | |
| 74 | mov r3 = in0 | |
| 75 | mov r8 = loc2 | |
| 76 | mov r15 = loc3 | |
| 77 | mov b6 = r2 | |
| 78 | br.ret.sptk.few b6 | |
| 79 | END(_mcount) | |
| 80 | ||
| 81 | LOCAL_LEAF(_mcount_ret_helper) | |
| 82 | .prologue | |
| 83 | .altrp b7 | |
| 84 | .save ar.pfs, r3 | |
| 85 | .body | |
| 86 | alloc r2 = ar.pfs, 0, 0, 8, 0 | |
| 87 | mov ar.pfs = r3 | |
| 88 | br b7 | |
| 89 | END(_mcount_ret_helper) | |
| 90 | ||
| 91 | weak_alias (_mcount, mcount) |