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