| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* i386-specific implemetation of profiling support. |
| 2 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. |
| 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 |
| 17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <sysdep.h> |
| 21 | |
| 22 | /* We need a special version of the `mcount' function since for ix86 it |
| 23 | must not clobber any register. This has several reasons: |
| 24 | - there is a bug in gcc as of version 2.7.2.2 which prohibits the |
| 25 | use of profiling together with nested functions |
| 26 | - the ELF `fixup' function uses GCC's regparm feature |
| 27 | - some (future) systems might want to pass parameters in registers. */ |
| 28 | |
| 29 | .globl C_SYMBOL_NAME(_mcount) |
| 30 | .type C_SYMBOL_NAME(_mcount), @function |
| 31 | .align ALIGNARG(4) |
| 32 | C_LABEL(_mcount) |
| 33 | /* Save the caller-clobbered registers. */ |
| 34 | pushl %eax |
| 35 | pushl %ecx |
| 36 | pushl %edx |
| 37 | |
| 38 | movl 12(%esp), %edx |
| 39 | movl 4(%ebp), %eax |
| 40 | |
| 41 | /* No need to access the PLT or GOT, __mcount_internal is an |
| 42 | internal function and we can make a relative call. */ |
| 43 | call C_SYMBOL_NAME(__mcount_internal) |
| 44 | |
| 45 | /* Pop the saved registers. Please note that `mcount' has no |
| 46 | return value. */ |
| 47 | popl %edx |
| 48 | popl %ecx |
| 49 | popl %eax |
| 50 | ret |
| 51 | ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount)) |
| 52 | |
| 53 | #undef mcount |
| 54 | weak_alias (_mcount, mcount) |
| 55 | |
| 56 | /* Same as above, but doesn't require a frame pointer */ |
| 57 | .globl C_SYMBOL_NAME(__fentry__) |
| 58 | .type C_SYMBOL_NAME(__fentry__), @function |
| 59 | .align ALIGNARG(4) |
| 60 | C_LABEL(__fentry__) |
| 61 | /* Save the caller-clobbered registers. */ |
| 62 | pushl %eax |
| 63 | pushl %ecx |
| 64 | pushl %edx |
| 65 | |
| 66 | movl 12(%esp), %edx |
| 67 | movl 16(%esp), %eax |
| 68 | |
| 69 | /* No need to access the PLT or GOT, __mcount_internal is an |
| 70 | internal function and we can make a relative call. */ |
| 71 | call C_SYMBOL_NAME(__mcount_internal) |
| 72 | |
| 73 | /* Pop the saved registers. Please note that `__fentry__' has no |
| 74 | return value. */ |
| 75 | popl %edx |
| 76 | popl %ecx |
| 77 | popl %eax |
| 78 | ret |
| 79 | ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) |