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annotate druntime/src/compiler/ldc/minit.asm @ 1458:e0b2d67cfe7c

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Added druntime (this should be removed once it works).
author Robert Clipsham <robert@octarineparrot.com>
date Tue, 02 Jun 2009 17:43:06 +0100
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1458
e0b2d67cfe7c Added druntime (this should be removed once it works).
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1 ;_ minit.asm
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2 ; Module initialization support.
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3 ;
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4 ; Copyright: Copyright Digital Mars 2000 - 2009.
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5 ; License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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6 ; Authors: Walter Bright
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7 ;
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8 ; Copyright Digital Mars 2000 - 2009.
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9 ; Distributed under the Boost Software License, Version 1.0.
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10 ; (See accompanying file LICENSE_1_0.txt or copy at
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11 ; http://www.boost.org/LICENSE_1_0.txt)
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12 ;
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13 include macros.asm
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14
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15 ifdef _WIN32
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16 DATAGRP EQU FLAT
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17 else
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18 DATAGRP EQU DGROUP
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19 endif
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20
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21 ; Provide a default resolution for weak extern records, no way in C
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22 ; to define an omf symbol with a specific value
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23 public __nullext
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24 __nullext equ 0
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25
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26 extrn __moduleinfo_array:near
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27
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28 ; This bit of assembler is needed because, from C or D, one cannot
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29 ; specify the names of data segments. Why does this matter?
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30 ; All the ModuleInfo pointers are placed into a segment named 'FM'.
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31 ; The order in which they are placed in 'FM' is arbitrarily up to the linker.
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32 ; In order to walk all the pointers, we need to be able to find the
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33 ; beginning and the end of the 'FM' segment.
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34 ; This is done by bracketing the 'FM' segment with two other, empty,
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35 ; segments named 'FMB' and 'FME'. Since this module is the only one that
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36 ; ever refers to 'FMB' and 'FME', we get to control the order in which
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37 ; these segments appear relative to 'FM' by using a GROUP statement.
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38 ; So, we have in memory:
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39 ; FMB empty segment
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40 ; FM contains all the pointers
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41 ; FME empty segment
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42 ; and finding the limits of FM is as easy as taking the address of FMB
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43 ; and the address of FME.
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44
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45 ; These segments bracket FM, which contains the list of ModuleInfo pointers
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46 FMB segment dword use32 public 'DATA'
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47 FMB ends
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48 FM segment dword use32 public 'DATA'
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49 FM ends
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50 FME segment dword use32 public 'DATA'
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51 FME ends
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52
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53 ; This leaves room in the _fatexit() list for _moduleDtor()
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54 XOB segment dword use32 public 'BSS'
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55 XOB ends
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56 XO segment dword use32 public 'BSS'
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57 dd ?
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58 XO ends
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59 XOE segment dword use32 public 'BSS'
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60 XOE ends
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61
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62 DGROUP group FMB,FM,FME
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63
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64 begcode minit
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65
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66 ; extern (C) void _minit();
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67 ; Converts array of ModuleInfo pointers to a D dynamic array of them,
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68 ; so they can be accessed via D.
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69 ; Result is written to:
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70 ; extern (C) ModuleInfo[] _moduleinfo_array;
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71
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72 public __minit
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73 __minit proc near
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74 mov EDX,offset DATAGRP:FMB
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75 mov EAX,offset DATAGRP:FME
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76 mov dword ptr __moduleinfo_array+4,EDX
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77 sub EAX,EDX ; size in bytes of FM segment
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78 shr EAX,2 ; convert to array length
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79 mov dword ptr __moduleinfo_array,EAX
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80 ret
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81 __minit endp
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82
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83 endcode minit
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84
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85 end