[444] | 1 | /* Call ctors and dtors from elinux a.out shared libraries. |
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| 2 | Copyright (C) 1999, 2000, 2003, 2004, 2005 Axis Communications. |
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| 3 | All rights reserved. |
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| 4 | |
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| 5 | Redistribution and use in source and binary forms, with or without |
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| 6 | modification, are permitted provided that the following conditions |
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| 7 | are met: |
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| 8 | |
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| 9 | 1. Redistributions of source code must retain the above copyright |
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| 10 | notice, this list of conditions and the following disclaimer. |
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| 11 | |
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| 12 | 2. Neither the name of Axis Communications nor the names of its |
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| 13 | contributors may be used to endorse or promote products derived |
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| 14 | from this software without specific prior written permission. |
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| 15 | |
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| 16 | THIS SOFTWARE IS PROVIDED BY AXIS COMMUNICATIONS AND ITS CONTRIBUTORS |
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| 17 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 18 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| 19 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AXIS |
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| 20 | COMMUNICATIONS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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| 21 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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| 22 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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| 23 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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| 25 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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| 26 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 27 | POSSIBILITY OF SUCH DAMAGE. */ |
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| 28 | |
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| 29 | typedef void (*vfnp) (void); |
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| 30 | |
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| 31 | /* The guts of the _Libctors and _Libdtors is "optimized" away into |
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| 32 | empty functions when the definition is visible as well. Simplest |
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| 33 | solution is to emit the definitions as asm. We have no .previous |
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| 34 | directive in a.out, so we rely on the fact that everything in this |
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| 35 | file goes into the .text section. */ |
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| 36 | __asm__ |
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| 37 | ( |
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| 38 | ".text\n\t.global .$global.lib.ctors\n.$global.lib.ctors:\n\t.dword 0" |
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| 39 | ); |
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| 40 | __asm__ |
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| 41 | ( |
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| 42 | ".text\n\t.global .$global.lib.dtors\n.$global.lib.dtors:\n\t.dword 0" |
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| 43 | ); |
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| 44 | |
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| 45 | extern vfnp * const _Ctors asm(".$global.lib.ctors"); |
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| 46 | extern vfnp * const _Dtors asm(".$global.lib.dtors"); |
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| 47 | |
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| 48 | /* We better provide weak empty ctor and dtor lists, since they are |
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| 49 | not created if the main program does not have ctor/dtors. Because |
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| 50 | it's otherwise not used, GCC trunk "Mon Jul 25 22:33:14 UTC 2005" |
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| 51 | thinks it can remove defaultors, so we need to artificially mark it |
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| 52 | as used. FIXME: Perhaps a GCC bug. */ |
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| 53 | |
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| 54 | static vfnp const defaultors[] __attribute__ ((__used__)) = {0, 0}; |
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| 55 | |
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| 56 | extern vfnp * __CTOR_LIST__ __attribute__ ((weak, alias ("defaultors"))); |
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| 57 | extern vfnp * __DTOR_LIST__ __attribute__ ((weak, alias ("defaultors"))); |
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| 58 | |
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| 59 | void |
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| 60 | _Libctors (void) |
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| 61 | { |
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| 62 | const vfnp *firstor = _Ctors; |
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| 63 | const vfnp *ctors; |
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| 64 | |
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| 65 | /* Have to find the last ctor; they will run in opposite order as in |
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| 66 | the table. */ |
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| 67 | if (firstor != 0 && *firstor != 0) |
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| 68 | { |
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| 69 | for (ctors = firstor; *ctors != 0; ctors++) |
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| 70 | ; |
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| 71 | |
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| 72 | while (--ctors != firstor) |
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| 73 | { |
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| 74 | (**ctors)(); |
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| 75 | } |
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| 76 | |
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| 77 | (**ctors)(); |
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| 78 | } |
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| 79 | } |
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| 80 | |
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| 81 | void |
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| 82 | _Libdtors(void) |
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| 83 | { |
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| 84 | const vfnp *dtors = _Dtors; |
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| 85 | |
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| 86 | if (dtors) |
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| 87 | while (*dtors != 0) |
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| 88 | { |
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| 89 | (**dtors++) (); |
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| 90 | } |
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| 91 | } |
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