source: trunk/libs/newlib/src/libgloss/rl78/gcrt0.S @ 476

Last change on this file since 476 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.2 KB
Line 
1/* Copyright (c) 2011 Red Hat Incorporated.
2   All rights reserved.
3
4   Redistribution and use in source and binary forms, with or without
5   modification, are permitted provided that the following conditions
6   are met:
7
8     Redistributions of source code must retain the above copyright
9     notice, this list of conditions and the following disclaimer.
10
11     Redistributions in binary form must reproduce the above copyright
12     notice, this list of conditions and the following disclaimer in the
13     documentation and/or other materials provided with the distribution.
14
15     The name of Red Hat Incorporated may not be used to endorse
16     or promote products derived from this software without specific
17     prior written permission.
18
19   This software is provided by the copyright holders and contributors
20   "AS IS" and any express or implied warranties, including, but not
21   limited to, the implied warranties of merchantability and fitness for
22   a particular purpose are disclaimed.  In no event shall Red Hat
23   incorporated be liable for any direct, indirect, incidental, special,
24   exemplary, or consequential damages (including, but not limited to,
25   procurement of substitute goods or services; loss of use, data, or
26   profits; or business interruption) however caused and on any theory of
27   liability, whether in contract, strict liability, or tort (including
28   negligence or otherwise) arising in any way out of the use of this
29   software, even if advised of the possibility of such damage.  */
30
31#define PROFILE_SUPPORT 1
32
33#include "crt0.S"
34
35        .global __mcount                                               
36        .type   __mcount, @function
37__mcount:                                                               
38        ;; When a function is compiled for profiling, gcc creates code 
39        ;; like this at the start of each profiled function:           
40        ;;                                                             
41        ;;      .global <func_name>                                     
42        ;; <func_name>:                                                 
43        ;;      bsr __mcount                                           
44        ;;      <...function's prologue...>                             
45        ;;      <...function's body...>                                 
46        ;;                                                             
47        ;; We must save all of the argument registers, extract the     
48        ;; address of <func_name>, call _mcount_internal to do the     
49        ;; real work and then restore the argument registers before     
50        ;; returning.                                                   
51                                                                       
52        movw    ax, [sp]
53        push    ax
54        call    !!__mcount_internal
55        pop     ax
56        ret
57
58        .size   __mcount, . - __mcount
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