| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Code to enable profiling at program startup. |
| 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | In addition to the permissions in the GNU Lesser General Public |
| 11 | License, the Free Software Foundation gives you unlimited |
| 12 | permission to link the compiled version of this file with other |
| 13 | programs, and to distribute those programs without any restriction |
| 14 | coming from the use of this file. (The GNU Lesser General Public |
| 15 | License restrictions do apply in other respects; for example, they |
| 16 | cover modification of the file, and distribution when not linked |
| 17 | into another program.) |
| 18 | |
| 19 | Note that people who make modified versions of this file are not |
| 20 | obligated to grant this special exception for their modified |
| 21 | versions; it is their choice whether to do so. The GNU Lesser |
| 22 | General Public License gives permission to release a modified |
| 23 | version without this exception; this exception also makes it |
| 24 | possible to release a modified version which carries forward this |
| 25 | exception. |
| 26 | |
| 27 | The GNU C Library is distributed in the hope that it will be useful, |
| 28 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 30 | Lesser General Public License for more details. |
| 31 | |
| 32 | You should have received a copy of the GNU Lesser General Public |
| 33 | License along with the GNU C Library; if not, see |
| 34 | <http://www.gnu.org/licenses/>. */ |
| 35 | |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/gmon.h> |
| 38 | #include <stdlib.h> |
| 39 | #include <unistd.h> |
| 40 | #define __ASSEMBLY__ |
| 41 | #include <entry.h> |
| 42 | |
| 43 | /* Beginning and end of our code segment. We cannot declare them |
| 44 | as the external functions since we want the addresses of those |
| 45 | labels. Taking the address of a function may have different |
| 46 | meanings on different platforms. */ |
| 47 | #ifdef ENTRY_POINT_DECL |
| 48 | ENTRY_POINT_DECL(extern) |
| 49 | #else |
| 50 | extern char ENTRY_POINT[]; |
| 51 | #endif |
| 52 | extern char etext[]; |
| 53 | |
| 54 | #ifndef TEXT_START |
| 55 | # ifdef ENTRY_POINT_DECL |
| 56 | # define TEXT_START ENTRY_POINT |
| 57 | # else |
| 58 | # define TEXT_START &ENTRY_POINT |
| 59 | # endif |
| 60 | #endif |
| 61 | |
| 62 | #ifdef GMON_START_ARRAY_SECTION |
| 63 | static void __gmon_start__ (void); |
| 64 | static void (*const gmon_start_initializer) (void) |
| 65 | __attribute__ ((used, section (GMON_START_ARRAY_SECTION))) = &__gmon_start__; |
| 66 | static |
| 67 | #else |
| 68 | /* We cannot use the normal constructor mechanism to call |
| 69 | __gmon_start__ because gcrt1.o appears before crtbegin.o in the link. |
| 70 | Instead crti.o calls it specially. */ |
| 71 | extern void __gmon_start__ (void); |
| 72 | #endif |
| 73 | |
| 74 | void |
| 75 | __gmon_start__ (void) |
| 76 | { |
| 77 | /* Protect from being called more than once. Since crti.o is linked |
| 78 | into every shared library, each of their init functions will call us. */ |
| 79 | static int called; |
| 80 | |
| 81 | if (called) |
| 82 | return; |
| 83 | |
| 84 | called = 1; |
| 85 | |
| 86 | /* Start keeping profiling records. */ |
| 87 | __monstartup ((u_long) TEXT_START, (u_long) &etext); |
| 88 | |
| 89 | /* Call _mcleanup before exiting; it will write out gmon.out from the |
| 90 | collected data. */ |
| 91 | atexit (&_mcleanup); |
| 92 | } |