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