1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* Copyright (c) 2011 Red Hat Incorporated.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
The name of Red Hat Incorporated may not be used to endorse
or promote products derived from this software without specific
prior written permission.
This software is provided by the copyright holders and contributors
"AS IS" and any express or implied warranties, including, but not
limited to, the implied warranties of merchantability and fitness for
a particular purpose are disclaimed. In no event shall Red Hat
incorporated be liable for any direct, indirect, incidental, special,
exemplary, or consequential damages (including, but not limited to,
procurement of substitute goods or services; loss of use, data, or
profits; or business interruption) however caused and on any theory of
liability, whether in contract, strict liability, or tort (including
negligence or otherwise) arising in any way out of the use of this
software, even if advised of the possibility of such damage. */
#define PROFILE_SUPPORT 1
#include "crt0.S"
.global __mcount
.type __mcount, @function
__mcount:
;; When a function is compiled for profiling, gcc creates code
;; like this at the start of each profiled function:
;;
;; .global <func_name>
;; <func_name>:
;; bsr __mcount
;; <...function's prologue...>
;; <...function's body...>
;;
;; We must save all of the argument registers, extract the
;; address of <func_name>, call _mcount_internal to do the
;; real work and then restore the argument registers before
;; returning.
movw ax, [sp]
push ax
call !!__mcount_internal
pop ax
ret
.size __mcount, . - __mcount
|
