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annotate druntime/src/compiler/dmd/minit.asm @ 759:d3eb054172f9

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Added copy of druntime from DMD 2.020 modified for LDC.
author Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
date Tue, 11 Nov 2008 01:52:37 +0100
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d3eb054172f9 Added copy of druntime from DMD 2.020 modified for LDC.
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1 ;_ minit.asm
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2 ; Written by Walter Bright
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3 ; Digital Mars
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4 ; http://www.digitalmars.com/d/
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5 ; Placed into the Public Domain
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6
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7 include macros.asm
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8
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9 ifdef _WIN32
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10 DATAGRP EQU FLAT
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11 else
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12 DATAGRP EQU DGROUP
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13 endif
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14
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15 ; Provide a default resolution for weak extern records, no way in C
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16 ; to define an omf symbol with a specific value
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17 public __nullext
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18 __nullext equ 0
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19
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20 extrn __moduleinfo_array:near
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21
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22 ; This bit of assembler is needed because, from C or D, one cannot
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23 ; specify the names of data segments. Why does this matter?
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24 ; All the ModuleInfo pointers are placed into a segment named 'FM'.
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25 ; The order in which they are placed in 'FM' is arbitrarily up to the linker.
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26 ; In order to walk all the pointers, we need to be able to find the
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27 ; beginning and the end of the 'FM' segment.
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28 ; This is done by bracketing the 'FM' segment with two other, empty,
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29 ; segments named 'FMB' and 'FME'. Since this module is the only one that
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30 ; ever refers to 'FMB' and 'FME', we get to control the order in which
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31 ; these segments appear relative to 'FM' by using a GROUP statement.
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32 ; So, we have in memory:
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33 ; FMB empty segment
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34 ; FM contains all the pointers
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35 ; FME empty segment
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36 ; and finding the limits of FM is as easy as taking the address of FMB
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37 ; and the address of FME.
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38
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39 ; These segments bracket FM, which contains the list of ModuleInfo pointers
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40 FMB segment dword use32 public 'DATA'
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41 FMB ends
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42 FM segment dword use32 public 'DATA'
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43 FM ends
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44 FME segment dword use32 public 'DATA'
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45 FME ends
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46
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47 ; This leaves room in the _fatexit() list for _moduleDtor()
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48 XOB segment dword use32 public 'BSS'
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49 XOB ends
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50 XO segment dword use32 public 'BSS'
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51 dd ?
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52 XO ends
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53 XOE segment dword use32 public 'BSS'
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54 XOE ends
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55
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56 DGROUP group FMB,FM,FME
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57
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58 begcode minit
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59
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60 ; extern (C) void _minit();
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61 ; Converts array of ModuleInfo pointers to a D dynamic array of them,
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62 ; so they can be accessed via D.
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63 ; Result is written to:
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64 ; extern (C) ModuleInfo[] _moduleinfo_array;
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65
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66 public __minit
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67 __minit proc near
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68 mov EDX,offset DATAGRP:FMB
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69 mov EAX,offset DATAGRP:FME
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70 mov dword ptr __moduleinfo_array+4,EDX
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71 sub EAX,EDX ; size in bytes of FM segment
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72 shr EAX,2 ; convert to array length
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73 mov dword ptr __moduleinfo_array,EAX
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74 ret
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75 __minit endp
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76
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77 endcode minit
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78
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79 end