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Rev | Author | Line No. | Line |
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425 | victor | 1 | $Revision: 425 $ |
276 | serge | 2 | ; Small heap based on malloc/free/realloc written by Doug Lea |
3 | ; Version 2.8.3 Thu Sep 22 11:16:15 2005 Doug Lea (dl at gee) |
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4 | ; Source ftp://gee.cs.oswego.edu/pub/misc/malloc.c |
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5 | ; License http://creativecommons.org/licenses/publicdomain. |
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6 | |||
7 | |||
8 | ; eax= size |
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9 | |||
10 | ; temp |
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11 | ; esi= nb |
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12 | ; ebx= idx |
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13 | ; |
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14 | malloc: |
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15 | push esi |
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16 | |||
17 | ; nb = ((size+7)&~7)+8; |
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18 | |||
19 | mov esi, eax ;size |
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20 | add esi, 7 |
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21 | and esi, -8 |
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22 | add esi, 8 |
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23 | |||
24 | mov ebx, mst.mutex |
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25 | call wait_mutex ;ebx |
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26 | |||
27 | cmp esi, 256 |
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28 | jae .large |
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29 | |||
30 | mov ecx, esi |
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326 | serge | 31 | shr ecx, 3 |
276 | serge | 32 | or eax, -1 |
33 | shl eax, cl |
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34 | and eax, [mst.smallmap] |
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35 | jz .small |
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36 | |||
37 | push ebp |
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38 | push edi |
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39 | |||
40 | bsf eax, eax |
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41 | mov ebx, eax |
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42 | |||
43 | ; psize= idx<<3; |
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44 | ; B = &ms.smallbins[idx]; |
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45 | ; p = B->fd; |
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46 | ; F = p->fd; |
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47 | ; rsize= psize-nb; |
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48 | |||
49 | lea ebp, [eax*8] ;ebp= psize |
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50 | shl eax, 4 |
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51 | lea edi, [mst.smallbins+eax] ;edi= B |
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52 | mov edx, [edi+8] ;edx= p |
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53 | mov eax, [edx+8] ;eax= F |
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54 | mov ecx, ebp |
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55 | sub ecx, esi ;ecx= rsize |
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56 | |||
57 | ; if (B == F) |
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58 | cmp edi, eax |
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59 | jne @F |
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60 | |||
61 | btr [mst.smallmap], ebx |
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62 | @@: |
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63 | |||
64 | ; B->fd = F; |
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65 | ; F->bk = B; |
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66 | ; if(rsize<16) |
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67 | |||
68 | cmp ecx, 16 |
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69 | mov [edi+8], eax |
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70 | mov [eax+12], edi |
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71 | jae .split |
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72 | |||
73 | ; p->head = psize|PINUSE_BIT|CINUSE_BIT; |
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74 | ; (p + psize)->head |= PINUSE_BIT; |
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75 | |||
76 | lea eax, [edx+8] |
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77 | or dword [edx+ebp+4], 1 |
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78 | |||
79 | or ebp, 3 |
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80 | mov [edx+4], ebp |
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81 | |||
82 | pop edi |
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83 | pop ebp |
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84 | .done: |
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85 | pop esi |
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86 | mov [mst.mutex], 0 |
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87 | ret |
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88 | .split: |
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89 | lea ebx, [edx+8] ;ebx=mem |
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90 | |||
91 | ; r = chunk_plus_offset(p, nb); |
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92 | ; p->head = nb|PINUSE_BIT|CINUSE_BIT; |
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93 | ; r->head = rsize|PINUSE_BIT; |
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94 | |||
95 | lea eax, [edx+esi] ;eax= r |
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96 | or esi, 3 |
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97 | mov [edx+4], esi |
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98 | |||
99 | mov edx, ecx |
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100 | or edx, 1 |
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101 | mov [eax+4], edx |
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102 | |||
103 | ; (r + rsize)->prev_foot = rsize; |
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104 | |||
105 | mov [eax+ecx], ecx |
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106 | |||
107 | ; I = rsize>>3; |
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108 | |||
109 | shr ecx, 3 |
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110 | |||
111 | ; ms.smallmap |= 1<< I; |
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112 | bts [mst.smallmap], ecx |
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113 | |||
114 | ; B = &ms.smallbins[I]; |
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115 | |||
116 | shl ecx, 4 |
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117 | pop edi |
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118 | pop ebp |
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119 | add ecx, mst.smallbins ;ecx= B |
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120 | |||
121 | mov edx, [ecx+8] ; F = B->fd; |
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122 | mov [ecx+8], eax ; B->fd = r; |
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123 | mov [edx+12], eax ; F->bk = r; |
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124 | mov [eax+8], edx ; r->fd = F; |
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125 | mov [eax+12], ecx ; r->bk = B; |
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126 | mov eax, ebx |
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127 | pop esi |
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128 | ret |
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129 | .small: |
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130 | |||
131 | ; if (ms.treemap != 0 && (mem = malloc_small(nb)) != 0) |
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132 | |||
133 | cmp [mst.treemap], 0 |
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134 | je .from_top |
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135 | mov eax, esi |
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136 | call malloc_small |
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137 | test eax, eax |
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138 | jz .from_top |
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139 | pop esi |
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140 | and [mst.mutex], 0 |
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141 | ret |
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142 | .large: |
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143 | |||
144 | ; if (ms.treemap != 0 && (mem = malloc_large(nb)) != 0) |
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145 | |||
146 | cmp [mst.treemap], 0 |
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147 | je .from_top |
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148 | |||
149 | call malloc_large ;esi= nb |
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150 | test eax, eax |
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151 | jne .done |
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152 | .from_top: |
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153 | |||
154 | ; if (nb < ms.topsize) |
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155 | |||
156 | mov eax, [mst.topsize] |
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157 | cmp esi, eax |
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158 | jae .fail |
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159 | |||
160 | ; rsize = ms.topsize -= nb; |
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161 | ; p = ms.top; |
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162 | |||
163 | mov ecx, [mst.top] |
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164 | sub eax, esi |
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165 | mov [mst.topsize], eax |
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166 | |||
167 | ; r = ms.top = chunk_plus_offset(p, nb); |
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168 | ; r->head = rsize | PINUSE_BIT; |
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169 | ; p->head = nb |PINUSE_BIT|CINUSE_BIT; |
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170 | |||
171 | lea edx, [ecx+esi] |
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172 | or eax, 1 |
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173 | mov [mst.top], edx |
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174 | or esi, 3 |
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175 | mov [edx+4], eax |
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176 | mov [ecx+4], esi |
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177 | lea eax, [ecx+8] |
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178 | pop esi |
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179 | and [mst.mutex], 0 |
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180 | ret |
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181 | .fail: |
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182 | xor eax, eax |
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183 | pop esi |
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184 | and [mst.mutex], 0 |
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185 | ret |
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186 | |||
187 | ; param |
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188 | ; eax= mem |
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189 | |||
190 | align 4 |
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191 | free: |
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192 | push edi |
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193 | mov edi, eax |
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194 | add edi, -8 |
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195 | |||
196 | ; if(p->head & CINUSE_BIT) |
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197 | |||
198 | test byte [edi+4], 2 |
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199 | je .fail |
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200 | |||
201 | mov ebx, mst.mutex |
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202 | call wait_mutex ;ebx |
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203 | |||
204 | ; psize = p->head & (~3); |
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205 | |||
206 | mov eax, [edi+4] |
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207 | push esi |
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208 | mov esi, eax |
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209 | and esi, -4 |
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210 | |||
211 | ; next = chunk_plus_offset(p, psize); |
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212 | ; if(!(p->head & PINUSE_BIT)) |
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213 | |||
214 | test al, 1 |
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215 | lea ebx, [esi+edi] |
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216 | jne .next |
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217 | |||
218 | ; prevsize = p->prev_foot; |
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219 | ; prev=p - prevsize; |
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220 | ; psize += prevsize; |
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221 | ; p = prev; |
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222 | |||
223 | mov ecx, [edi] ;ecx= prevsize |
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224 | add esi, ecx ;esi= psize |
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225 | sub edi, ecx ;edi= p |
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226 | |||
227 | ; if (prevsize < 256) |
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228 | |||
229 | cmp ecx, 256 |
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230 | jae .unlink_large |
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231 | |||
232 | mov eax, [edi+8] ;F = p->fd; |
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233 | mov edx, [edi+12] ;B = p->bk; |
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234 | |||
235 | ; if (F == B) |
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236 | ; ms.smallmap &= ~(1<< I); |
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237 | shr ecx, 3 |
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238 | cmp eax, edx |
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239 | jne @F |
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240 | and [mst.smallmap], ecx |
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241 | @@: |
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242 | mov [eax+12], edx ;F->bk = B; |
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243 | mov [edx+8], eax ;B->fd = F |
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244 | jmp .next |
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245 | .unlink_large: |
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246 | mov edx, edi |
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247 | call unlink_large_chunk |
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248 | .next: |
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249 | |||
250 | ; if(next->head & PINUSE_BIT) |
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251 | |||
252 | mov eax, [ebx+4] |
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253 | test al, 1 |
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254 | jz .fail2 |
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255 | |||
256 | ; if (! (next->head & CINUSE_BIT)) |
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257 | |||
258 | test al, 2 |
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259 | jnz .fix_next |
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260 | |||
261 | ; if (next == ms.top) |
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262 | |||
263 | cmp ebx, [mst.top] |
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264 | jne @F |
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265 | |||
266 | ; tsize = ms.topsize += psize; |
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267 | |||
268 | mov eax, [mst.topsize] |
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269 | add eax, esi |
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270 | mov [mst.topsize], eax |
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271 | |||
272 | ; ms.top = p; |
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273 | ; p->head = tsize | PINUSE_BIT; |
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274 | |||
275 | or eax, 1 |
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276 | mov [mst.top], edi |
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277 | mov [edi+4], eax |
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278 | .fail2: |
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279 | and [mst.mutex], 0 |
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280 | pop esi |
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281 | .fail: |
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282 | pop edi |
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283 | ret |
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284 | @@: |
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285 | |||
286 | ; nsize = next->head & ~INUSE_BITS; |
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287 | |||
288 | and eax, -4 |
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289 | add esi, eax ;psize += nsize; |
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290 | |||
291 | ; if (nsize < 256) |
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292 | |||
293 | cmp eax, 256 |
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294 | jae .unl_large |
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295 | |||
296 | mov edx, [ebx+8] ;F = next->fd |
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297 | mov ebx, [ebx+12] ;B = next->bk |
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298 | |||
299 | ; if (F == B) |
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300 | |||
301 | cmp edx, ebx |
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302 | jne @F |
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303 | mov ecx, eax |
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304 | shr ecx, 3 |
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305 | btr [mst.smallmap], ecx |
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306 | @@: |
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307 | mov [edx+12], ebx ;F->bk = B |
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308 | |||
309 | ; p->head = psize|PINUSE_BIT; |
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310 | |||
311 | mov ecx, esi |
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312 | mov [ebx+8], edx |
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313 | or ecx, 1 |
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314 | mov [edi+4], ecx |
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315 | |||
316 | ; (p+psize)->prev_foot = psize; |
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317 | |||
318 | mov [esi+edi], esi |
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319 | |||
320 | ; insert_chunk(p,psize); |
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321 | |||
322 | mov eax, esi |
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323 | pop esi |
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324 | mov ecx, edi |
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325 | pop edi |
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326 | jmp insert_chunk |
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327 | .unl_large: |
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328 | |||
329 | ; unlink_large_chunk((tchunkptr)next); |
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330 | |||
331 | mov edx, ebx |
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332 | call unlink_large_chunk |
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333 | ; p->head = psize|PINUSE_BIT; |
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334 | |||
335 | mov ecx, esi |
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336 | or ecx, 1 |
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337 | mov [edi+4], ecx |
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338 | |||
339 | ; (p+psize)->prev_foot = psize; |
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340 | |||
341 | mov [esi+edi], esi |
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342 | |||
343 | ; insert_chunk(p,psize); |
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344 | |||
345 | mov eax, esi |
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346 | pop esi |
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347 | mov ecx, edi |
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348 | pop edi |
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349 | jmp insert_chunk |
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350 | .fix_next: |
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351 | |||
352 | ; (p+psize)->prev_foot = psize; |
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353 | ; next->head &= ~PINUSE_BIT; |
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354 | ; p->head = psize|PINUSE_BIT; |
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355 | |||
356 | and eax, -2 |
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357 | mov edx, esi |
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358 | mov [ebx+4], eax |
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359 | or edx, 1 |
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360 | mov [edi+4], edx |
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361 | |||
362 | ; (p+psize)->prev_foot = psize; |
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363 | |||
364 | mov [esi+edi], esi |
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365 | ; insert_chunk(p,psize); |
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366 | |||
367 | mov eax, esi |
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368 | pop esi |
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369 | mov ecx, edi |
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370 | pop edi |
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371 | jmp insert_chunk |
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372 | |||
373 | ; param |
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374 | ; ecx = chunk |
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375 | ; eax = size |
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376 | |||
377 | align 4 |
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378 | insert_chunk: |
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379 | |||
380 | cmp eax, 256 |
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381 | push esi |
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382 | mov esi, ecx |
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383 | jae .large |
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384 | |||
385 | ; I = S>>3; |
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386 | ; ms.smallmap |= 1<< I; |
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387 | |||
388 | shr eax, 3 |
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389 | bts [mst.smallmap], eax |
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390 | |||
391 | ; B = &ms.smallbins[I]; |
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392 | |||
393 | shl eax, 4 |
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394 | add eax, mst.smallbins |
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395 | mov edx, [eax+8] ;F = B->fd |
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396 | mov [eax+8], esi ;B->fd = P |
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397 | mov [edx+12], esi ;F->bk = P |
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398 | mov [esi+8], edx ;P->fd = F |
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399 | mov [esi+12], eax ;P->bk = B |
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400 | pop esi |
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401 | and [mst.mutex], 0 |
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402 | ret |
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403 | .large: |
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404 | mov ebx, eax |
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405 | call insert_large_chunk |
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406 | pop esi |
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407 | and [mst.mutex], 0 |
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408 | ret |
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409 | |||
410 | align 4 |
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411 | |||
412 | ; param |
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413 | ; esi= chunk |
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414 | ; ebx= size |
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415 | |||
416 | align 4 |
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417 | insert_large_chunk: |
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418 | |||
419 | ; I = compute_tree_index(S); |
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420 | |||
421 | mov edx, ebx |
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422 | shr edx, 8 |
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423 | bsr eax, edx |
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424 | lea ecx, [eax+7] |
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425 | mov edx, ebx |
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426 | shr edx, cl |
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427 | and edx, 1 |
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428 | lea ecx, [edx+eax*2] |
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429 | |||
430 | ; X->index = I; |
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431 | mov dword [esi+28], ecx |
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432 | |||
433 | ; X->child[0] = X->child[1] = 0; |
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434 | and dword [esi+20], 0 |
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435 | and dword [esi+16], 0 |
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436 | |||
437 | ; H = &ms.treebins[I]; |
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438 | |||
439 | mov eax, ecx |
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440 | lea edx, [mst.treebins+eax*4] |
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441 | |||
442 | ; if (!(ms.treemap & 1< |
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443 | bt [mst.treemap], ecx |
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444 | jc .tree |
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445 | |||
446 | ; ms.treemap |= 1< |
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447 | bts [mst.treemap], ecx |
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448 | ; *H = X; |
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449 | mov dword [edx], esi |
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450 | jmp .done |
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451 | .tree: |
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452 | |||
453 | ; T = *H; |
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454 | mov edx, [edx] |
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455 | |||
456 | ; K = S << leftshift_for_tree_index(I); |
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457 | mov eax, ecx |
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458 | shr eax, 1 |
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459 | sub ecx, 31 |
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460 | mov edi, 37 |
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461 | sub edi, eax |
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462 | neg ecx |
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463 | sbb ecx, ecx |
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464 | and ecx, edi |
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465 | mov eax, ebx |
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466 | shl eax, cl ;eax= K |
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467 | |||
468 | jmp .loop |
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469 | |||
470 | .not_eq_size: |
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471 | |||
472 | ; C = &(T->child[(K >> 31) & 1]); |
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473 | mov ecx, eax |
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474 | shr ecx, 31 |
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475 | lea ecx, [edx+ecx*4+16] |
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476 | |||
477 | ; K <<= 1; |
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478 | ; if (*C != 0) |
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479 | mov edi, [ecx] |
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480 | add eax, eax |
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481 | test edi, edi |
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482 | jz .insert_child |
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483 | |||
484 | ; T = *C; |
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485 | mov edx, edi |
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486 | .loop: |
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487 | |||
488 | ; for (;;) |
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489 | ; if ((T->head & ~INUSE_BITS) != S) |
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490 | |||
491 | mov ecx, [edx+4] |
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492 | and ecx, not 3 |
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493 | cmp ecx, ebx |
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494 | jne .not_eq_size |
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495 | |||
496 | ; F = T->fd; |
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497 | mov eax, [edx+8] |
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498 | |||
499 | ; T->fd = F->bk = X; |
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500 | mov [eax+12], esi |
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501 | mov [edx+8], esi |
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502 | |||
503 | ; X->fd = F; |
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504 | ; X->bk = T; |
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505 | ; X->parent = 0; |
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506 | |||
507 | and dword [esi+24], 0 |
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508 | mov [esi+8], eax |
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509 | mov [esi+12], edx |
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510 | ret |
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511 | |||
512 | .insert_child: |
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513 | |||
514 | ; *C = X; |
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515 | mov [ecx], esi |
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516 | .done: |
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517 | |||
518 | ; X->parent = T; |
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519 | mov [esi+24], edx |
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520 | |||
521 | ; X->fd = X->bk = X; |
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522 | mov [esi+12], esi |
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523 | mov [esi+8], esi |
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524 | ret |
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525 | |||
526 | |||
527 | ; param |
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528 | ; edx= chunk |
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529 | |||
530 | align 4 |
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531 | unlink_large_chunk: |
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532 | |||
533 | mov eax, [edx+12] |
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534 | cmp eax, edx |
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535 | push edi |
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536 | mov edi, [edx+24] |
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537 | je @F |
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538 | |||
539 | mov ecx, [edx+8] ;F = X->fd |
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540 | mov [ecx+12], eax ;F->bk = R; |
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541 | mov [eax+8], ecx ;R->fd = F |
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542 | jmp .parent |
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543 | @@: |
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544 | mov eax, [edx+20] |
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545 | test eax, eax |
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546 | push esi |
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547 | lea esi, [edx+20] |
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548 | jne .loop |
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549 | |||
550 | mov eax, [edx+16] |
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551 | test eax, eax |
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552 | lea esi, [edx+16] |
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553 | je .l2 |
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554 | .loop: |
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555 | cmp dword [eax+20], 0 |
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556 | lea ecx, [eax+20] |
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557 | jne @F |
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558 | |||
559 | cmp dword [eax+16], 0 |
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560 | lea ecx, [eax+16] |
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561 | je .l1 |
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562 | @@: |
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563 | mov eax, [ecx] |
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564 | mov esi, ecx |
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565 | jmp .loop |
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566 | .l1: |
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567 | mov dword [esi], 0 |
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568 | .l2: |
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569 | pop esi |
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570 | .parent: |
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571 | test edi, edi |
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572 | je .done |
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573 | |||
574 | mov ecx, [edx+28] |
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575 | cmp edx, [mst.treebins+ecx*4] |
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576 | lea ecx, [mst.treebins+ecx*4] |
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577 | jne .l3 |
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578 | |||
579 | test eax, eax |
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580 | mov [ecx], eax |
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581 | jne .l5 |
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582 | |||
583 | mov ecx, [edx+28] |
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584 | btr [mst.treemap], ecx |
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585 | pop edi |
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586 | ret |
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587 | .l3: |
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588 | cmp [edi+16], edx |
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589 | jne @F |
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590 | |||
591 | mov [edi+16], eax |
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592 | jmp .l4 |
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593 | @@: |
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594 | mov [edi+20], eax |
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595 | .l4: |
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596 | test eax, eax |
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597 | je .done |
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598 | .l5: |
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599 | mov [eax+24], edi |
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600 | mov ecx, [edx+16] |
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601 | test ecx, ecx |
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602 | je .l6 |
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603 | |||
604 | mov [eax+16], ecx |
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605 | mov [ecx+24], eax |
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606 | .l6: |
||
607 | mov edx, [edx+20] |
||
608 | test edx, edx |
||
609 | je .done |
||
610 | |||
611 | mov [eax+20], edx |
||
612 | mov [edx+24], eax |
||
613 | .done: |
||
614 | pop edi |
||
615 | ret |
||
616 | |||
617 | ; param |
||
618 | ; esi= nb |
||
619 | |||
620 | align 4 |
||
621 | malloc_small: |
||
622 | push ebp |
||
623 | mov ebp, esi |
||
624 | |||
625 | push edi |
||
626 | |||
627 | bsf eax,[mst.treemap] |
||
628 | mov ecx, [mst.treebins+eax*4] |
||
629 | |||
630 | ; rsize = (t->head & ~INUSE_BITS) - nb; |
||
631 | |||
632 | mov edi, [ecx+4] |
||
633 | and edi, -4 |
||
634 | sub edi, esi |
||
635 | .loop: |
||
636 | mov ebx, ecx |
||
637 | .loop_1: |
||
638 | |||
639 | ; while ((t = leftmost_child(t)) != 0) |
||
640 | |||
641 | mov eax, [ecx+16] |
||
642 | test eax, eax |
||
643 | jz @F |
||
644 | mov ecx, eax |
||
645 | jmp .l1 |
||
646 | @@: |
||
647 | mov ecx, [ecx+20] |
||
648 | .l1: |
||
649 | test ecx, ecx |
||
650 | jz .unlink |
||
651 | |||
652 | ; trem = (t->head & ~INUSE_BITS) - nb; |
||
653 | |||
654 | mov eax, [ecx+4] |
||
655 | and eax, -4 |
||
656 | sub eax, ebp |
||
657 | |||
658 | ; if (trem < rsize) |
||
659 | |||
660 | cmp eax, edi |
||
661 | jae .loop_1 |
||
662 | |||
663 | ; rsize = trem; |
||
664 | |||
665 | mov edi, eax |
||
666 | jmp .loop |
||
667 | .unlink: |
||
668 | |||
669 | |||
670 | ; r = chunk_plus_offset((mchunkptr)v, nb); |
||
671 | ; unlink_large_chunk(v); |
||
672 | |||
673 | mov edx, ebx |
||
674 | lea esi, [ebx+ebp] |
||
675 | call unlink_large_chunk |
||
676 | |||
677 | ; if (rsize < 16) |
||
678 | |||
679 | cmp edi, 16 |
||
680 | jae .split |
||
681 | |||
682 | ; v->head = (rsize + nb)|PINUSE_BIT|CINUSE_BIT; |
||
683 | |||
684 | lea ecx, [edi+ebp] |
||
685 | |||
686 | ; (v+rsize + nb)->head |= PINUSE_BIT; |
||
687 | |||
688 | add edi, ebx |
||
689 | lea eax, [edi+ebp+4] |
||
690 | pop edi |
||
691 | or ecx, 3 |
||
692 | mov [ebx+4], ecx |
||
693 | or dword [eax], 1 |
||
694 | pop ebp |
||
695 | |||
696 | lea eax, [ebx+8] |
||
697 | ret |
||
698 | .split: |
||
699 | |||
700 | ; v->head = nb|PINUSE_BIT|CINUSE_BIT; |
||
701 | ; r->head = rsize|PINUSE_BIT; |
||
702 | ; (r+rsize)->prev_foot = rsize; |
||
703 | |||
704 | or ebp, 3 |
||
705 | mov edx, edi |
||
706 | or edx, 1 |
||
707 | |||
708 | cmp edi, 256 |
||
709 | mov [ebx+4], ebp |
||
710 | mov [esi+4], edx |
||
711 | mov [esi+edi], edi |
||
712 | jae .large |
||
713 | |||
714 | shr edi, 3 |
||
715 | bts [mst.smallmap], edi |
||
716 | |||
717 | mov eax, edi |
||
718 | shl eax, 4 |
||
719 | add eax, mst.smallbins |
||
720 | |||
721 | mov edx, [eax+8] |
||
722 | mov [eax+8], esi |
||
723 | mov [edx+12], esi |
||
724 | pop edi |
||
725 | mov [esi+12], eax |
||
726 | mov [esi+8], edx |
||
727 | pop ebp |
||
728 | lea eax, [ebx+8] |
||
729 | ret |
||
730 | .large: |
||
731 | lea eax, [ebx+8] |
||
732 | push eax |
||
733 | mov ebx, edi |
||
734 | call insert_large_chunk |
||
735 | pop eax |
||
736 | pop edi |
||
737 | pop ebp |
||
738 | ret |
||
739 | |||
740 | |||
741 | ; param |
||
742 | ; esi= nb |
||
743 | |||
744 | align 4 |
||
745 | malloc_large: |
||
746 | .idx equ esp+4 |
||
747 | .rst equ esp |
||
748 | |||
749 | push ebp |
||
750 | push edi |
||
751 | sub esp, 8 |
||
752 | ; v = 0; |
||
753 | ; rsize = -nb; |
||
754 | |||
755 | mov edi, esi |
||
756 | mov ebx, esi |
||
757 | xor ebp, ebp |
||
758 | neg edi |
||
759 | |||
760 | ; idx = compute_tree_index(nb); |
||
761 | |||
762 | mov edx, esi |
||
763 | shr edx, 8 |
||
764 | bsr eax, edx |
||
765 | lea ecx, [eax+7] |
||
766 | shr esi, cl |
||
767 | and esi, 1 |
||
768 | lea ecx, [esi+eax*2] |
||
769 | mov [.idx], ecx |
||
770 | |||
771 | ; if ((t = ms.treebins[idx]) != 0) |
||
772 | |||
773 | mov eax, [mst.treebins+ecx*4] |
||
774 | test eax, eax |
||
775 | jz .l3 |
||
776 | |||
777 | ; sizebits = nb << leftshift_for_tree_index(idx); |
||
778 | |||
779 | cmp ecx, 31 |
||
780 | jne @F |
||
781 | xor ecx, ecx |
||
782 | jmp .l1 |
||
783 | @@: |
||
784 | mov edx, ecx |
||
785 | shr edx, 1 |
||
786 | mov ecx, 37 |
||
787 | sub ecx, edx |
||
788 | .l1: |
||
789 | mov edx, ebx |
||
790 | shl edx, cl |
||
791 | |||
792 | ; rst = 0; |
||
793 | mov [.rst], ebp |
||
794 | .loop: |
||
795 | |||
796 | ; trem = (t->head & ~INUSE_BITS) - nb; |
||
797 | |||
798 | mov ecx, [eax+4] |
||
799 | and ecx, -4 |
||
800 | sub ecx, ebx |
||
801 | |||
802 | ; if (trem < rsize) |
||
803 | |||
804 | cmp ecx, edi |
||
805 | jae @F |
||
806 | ; v = t; |
||
807 | ; if ((rsize = trem) == 0) |
||
808 | |||
809 | test ecx, ecx |
||
810 | mov ebp, eax |
||
811 | mov edi, ecx |
||
812 | je .l2 |
||
813 | @@: |
||
814 | |||
815 | ; rt = t->child[1]; |
||
816 | |||
817 | mov ecx, [eax+20] |
||
818 | |||
819 | ; t = t->child[(sizebits >> 31) & 1]; |
||
820 | |||
821 | mov esi, edx |
||
822 | shr esi, 31 |
||
823 | |||
824 | ; if (rt != 0 && rt != t) |
||
825 | |||
826 | test ecx, ecx |
||
827 | mov eax, [eax+esi*4+16] |
||
828 | jz @F |
||
829 | cmp ecx, eax |
||
830 | jz @F |
||
831 | |||
832 | ; rst = rt; |
||
833 | mov [.rst], ecx |
||
834 | @@: |
||
835 | ; if (t == 0) |
||
836 | |||
837 | test eax, eax |
||
838 | jz @F |
||
839 | |||
840 | ; sizebits <<= 1; |
||
841 | |||
842 | add edx, edx |
||
843 | jmp .loop |
||
844 | @@: |
||
845 | ; t = rst; |
||
846 | mov eax, [.rst] |
||
847 | .l2: |
||
848 | ; if (t == 0 && v == 0) |
||
849 | |||
850 | test eax, eax |
||
851 | jne .l4 |
||
852 | test ebp, ebp |
||
853 | jne .l7 |
||
854 | mov ecx, [.idx] |
||
855 | .l3: |
||
856 | |||
857 | ; leftbits = (-1< |
||
858 | ; if (leftbits != 0) |
||
859 | |||
860 | or edx, -1 |
||
861 | shl edx, cl |
||
862 | and edx, [mst.treemap] |
||
863 | jz @F |
||
864 | |||
865 | bsf eax, edx |
||
866 | ; t = ms.treebins[i]; |
||
867 | mov eax, [mst.treebins+eax*4] |
||
868 | @@: |
||
869 | |||
870 | ; while (t != 0) |
||
871 | test eax, eax |
||
872 | jz .l5 |
||
873 | .l4: |
||
874 | |||
875 | ; trem = (t->head & ~INUSE_BITS) - nb; |
||
876 | |||
877 | mov ecx, [eax+4] |
||
878 | and ecx, -4 |
||
879 | sub ecx, ebx |
||
880 | |||
881 | ; if (trem < rsize) |
||
882 | |||
883 | cmp ecx, edi |
||
884 | jae @F |
||
885 | ; rsize = trem; |
||
886 | |||
887 | mov edi, ecx |
||
888 | ; v = t; |
||
889 | mov ebp, eax |
||
890 | @@: |
||
891 | |||
892 | ; t = leftmost_child(t); |
||
893 | |||
894 | mov ecx, [eax+16] |
||
895 | test ecx, ecx |
||
896 | je @F |
||
897 | mov eax, ecx |
||
898 | jmp .l6 |
||
899 | @@: |
||
900 | mov eax, [eax+20] |
||
901 | .l6: |
||
902 | |||
903 | ; while (t != 0) |
||
904 | |||
905 | test eax, eax |
||
906 | jne .l4 |
||
907 | .l5: |
||
908 | |||
909 | ; if (v != 0) |
||
910 | |||
911 | test ebp, ebp |
||
912 | jz .done |
||
913 | .l7: |
||
914 | |||
915 | ; r = chunk_plus_offset((mchunkptr)v, nb); |
||
916 | ; unlink_large_chunk(v); |
||
917 | |||
918 | mov edx, ebp |
||
919 | lea esi, [ebx+ebp] |
||
920 | call unlink_large_chunk |
||
921 | |||
326 | serge | 922 | ; if (rsize < 16) |
276 | serge | 923 | |
326 | serge | 924 | cmp edi, 16 |
276 | serge | 925 | jae .large |
926 | |||
927 | ; v->head = (rsize + nb)|PINUSE_BIT|CINUSE_BIT; |
||
928 | |||
929 | lea ecx, [edi+ebx] |
||
930 | |||
931 | ; (v+rsize + nb)->head |= PINUSE_BIT; |
||
932 | |||
933 | add edi, ebp |
||
934 | lea eax, [edi+ebx+4] |
||
935 | or ecx, 3 |
||
936 | mov [ebp+4], ecx |
||
937 | or dword [eax], 1 |
||
938 | lea eax, [ebp+8] |
||
939 | add esp, 8 |
||
940 | pop edi |
||
941 | pop ebp |
||
942 | ret |
||
943 | .large: |
||
944 | |||
945 | ; v->head = nb|PINUSE_BIT|CINUSE_BIT; |
||
946 | ; r->head = rsize|PINUSE_BIT; |
||
947 | |||
948 | mov edx, edi |
||
949 | or ebx, 3 |
||
950 | mov [ebp+4], ebx |
||
951 | or edx, 1 |
||
952 | mov [esi+4], edx |
||
953 | |||
954 | ; (r+rsize)->prev_foot = rsize; |
||
955 | ; insert_large_chunk((tchunkptr)r, rsize); |
||
956 | |||
957 | mov [esi+edi], edi |
||
326 | serge | 958 | mov eax, edi |
959 | mov ecx, esi |
||
960 | call insert_chunk |
||
276 | serge | 961 | |
962 | lea eax, [ebp+8] |
||
963 | add esp, 8 |
||
964 | pop edi |
||
965 | pop ebp |
||
966 | ret |
||
967 | .done: |
||
968 | add esp, 8 |
||
969 | pop edi |
||
970 | pop ebp |
||
971 | xor eax, eax |
||
972 | ret |
||
973 | |||
974 | align 4 |
||
975 | init_malloc: |
||
976 | |||
977 | stdcall kernel_alloc, 0x20000 |
||
978 | |||
979 | mov [mst.top], eax |
||
980 | mov [mst.topsize], 128*1024 |
||
981 | mov dword [eax+4], (128*1024) or 1 |
||
982 | mov eax, mst.smallbins |
||
983 | @@: |
||
984 | mov [eax+8], eax |
||
985 | mov [eax+12], eax |
||
986 | add eax, 16 |
||
987 | cmp eax, mst.smallbins+512 |
||
988 | jl @B |
||
989 | |||
990 | ret>> |
||
991 | |||
992 | |||
993 | |||
994 |