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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