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linux内核中的copy_to_user和copy_from_user(一)

时间：11-22 来源：互联网 点击：

  1. #4
  2. ldrnetr3,[r1],#4@Shouldntfault
  3. strner3,[r0],#4
  4. andsip,ip,#3
  5. beq.cfu_0fupi
  6. .cfu_0nowords:teqip,#0
  7. beq.cfu_finished
  8. .cfu_nowords:cmpip,#2
  9. USER(ldrbtr3,[r1],#1)@Mayfault
  10. strbr3,[r0],#1
  11. USER(ldrgebtr3,[r1],#1)@Mayfault
  12. strgebr3,[r0],#1
  13. USER(ldrgtbtr3,[r1],#1)@Mayfault
  14. strgtbr3,[r0],#1
  15. b.cfu_finished
  17. .cfu_not_enough:
  18. movsip,r2
  19. bne.cfu_nowords
  20. .cfu_finished:movr0,#0
  21. addsp,sp,#8
  22. LOADREGS(fd,sp!,{r4-r7,pc})
  24. .cfu_src_not_aligned:
  25. bicr1,r1,#3
  26. USER(ldrtr7,[r1],#4)@Mayfault
  27. cmpip,#2
  28. bgt.cfu_3fupi
  29. beq.cfu_2fupi
  30. .cfu_1fupi:subsr2,r2,#4
  31. addmiip,r2,#4
  32. bmi.cfu_1nowords
  33. movr3,r7,pull#8
  34. USER(ldrtr7,[r1],#4)@Mayfault
  35. orrr3,r3,r7,push#24
  36. strr3,[r0],#4
  37. movip,r1,lsl#32-PAGE_SHIFT
  38. rsbip,ip,#0
  39. movsip,ip,lsr#32-PAGE_SHIFT
  40. beq.cfu_1fupi
  41. cmpr2,ip
  42. movltip,r2
  43. subr2,r2,ip
  44. subsip,ip,#16
  45. blt.cfu_1rem8lp
  46. PLD(pld[r1,#12])
  47. PLD(pld[r0,#12])
  48. PLD(subsip,ip,#32)
  49. PLD(blt.cfu_1cpynopld)
  50. PLD(pld[r1,#28])
  51. PLD(pld[r0,#28])
  53. .cfu_1cpy8lp:
  54. PLD(pld[r1,#44])
  55. PLD(pld[r0,#44])
  56. .cfu_1cpynopld:movr3,r7,pull#8
  57. ldmiar1!,{r4-r7}@Shouldntfault
  58. subsip,ip,#16
  59. orrr3,r3,r4,push#24
  60. movr4,r4,pull#8
  61. orrr4,r4,r5,push#24
  62. movr5,r5,pull#8
  63. orrr5,r5,r6,push#24
  64. movr6,r6,pull#8
  65. orrr6,r6,r7,push#24
  66. stmiar0!,{r3-r6}
  67. bpl.cfu_1cpy8lp
  68. PLD(cmnip,#32)
  69. PLD(bge.cfu_1cpynopld)
  70. PLD(addip,ip,#32)
  72. .cfu_1rem8lp:tstip,#8
  73. movner3,r7,pull#8
  74. ldmneiar1!,{r4,r7}@Shouldntfault
  75. orrner3,r3,r4,push#24
  76. movner4,r4,pull#8
  77. orrner4,r4,r7,push#24
  78. stmneiar0!,{r3-r4}
  79. tstip,#4
  80. movner3,r7,pull#8
  81. USER(ldrnetr7,[r1],#4)@Mayfault
  82. orrner3,r3,r7,push#24
  83. strner3,[r0],#4
  84. andsip,ip,#3
  85. beq.cfu_1fupi
  86. .cfu_1nowords:movr3,r7,get_byte_1
  87. teqip,#0
  88. beq.cfu_finished
  89. cmpip,#2
  90. strbr3,[r0],#1
  91. movger3,r7,get_byte_2
  92. strgebr3,[r0],#1
  93. movgtr3,r7,get_byte_3
  94. strgtbr3,[r0],#1
  95. b.cfu_finished
  97. .cfu_2fupi:subsr2,r2,#4
  98. addmiip,r2,#4
  99. bmi.cfu_2nowords
  100. movr3,r7,pull#16
  101. USER(ldrtr7,[r1],#4)@Mayfault
  102. orrr3,r3,r7,push#16
  103. strr3,[r0],#4
  104. movip,r1,lsl#32-PAGE_SHIFT
  105. rsbip,ip,#0
  106. movsip,ip,lsr#32-PAGE_SHIFT
  107. beq.cfu_2fupi
  108. cmpr2,ip
  109. movltip,r2
  110. subr2,r2,ip
  111. subsip,ip,#16
  112. blt.cfu_2rem8lp
  113. PLD(pld[r1,#12])
  114. PLD(pld[r0,#12])
  115. PLD(subsip,ip,#32)
  116. PLD(blt.cfu_2cpynopld)
  117. PLD(pld[r1,#28])
  118. PLD(pld[r0,#28])
  120. .cfu_2cpy8lp:
  121. PLD(pld[r1,#44])
  122. PLD(pld[r0,#44])
  123. .cfu_2cpynopld:movr3,r7,pull#16
  124. ldmiar1!,{r4-r7}@Shouldntfault
  125. subsip,ip,#16
  126. orrr3,r3,r4,push#16
  127. movr4,r4,pull#16
  128. orrr4,r4,r5,push#16
  129. movr5,r5,pull#16
  130. orrr5,r5,r6,push#16
  131. movr6,r6,pull#16
  132. orrr6,r6,r7,push#16
  133. stmiar0!,{r3-r6}
  134. bpl.cfu_2cpy8lp
  135. PLD(cmnip,#32)
  136. PLD(bge.cfu_2cpynopld)
  137. PLD(addip,ip,#32)
  139. .cfu_2rem8lp:tstip,#8
  140. movner3,r7,pull#16
  141. ldmneiar1!,{r4,r7}@Shouldntfault
  142. orrner3,r3,r4,push#16
  143. movner4,r4,pull#16
  144. orrner4,r4,r7,push#16
  145. stmneiar0!,{r3-r4}
  146. tstip,#4
  147. movner3,r7,pull#16
  148. USER(ldrnetr7,[r1],#4)@Mayfault
  149. orrner3,r3,r7,push#16
  150. strner3,[r0],#4
  151. andsip,ip,#3
  152. beq.cfu_2fupi
  153. .cfu_2nowords:movr3,r7,get_byte_2
  154. teqip,#0
  155. beq.cfu_finished
  156. cmpip,#2
  157. strbr3,[r0],#1
  158. movger3,r7,get_byte_3
  159. strgebr3,[r0],#1
  160. USER(ldrgtbtr3,[r1],#0)@Mayfault
  161. strgtbr3,[r0],#1
  162. b.cfu_finished
  164. .cfu_3fupi:subsr2,r2,#4
  165. addmiip,r2,#4
  166. bmi.cfu_3nowords
  167. movr3,r7,pull#24
  168. USER(ldrtr7,[r1],#4)@Mayfault
  169. orrr3,r3,r7,push#8
  170. strr3,[r0],#4
  171. movip,r1,lsl#32-PAGE_SHIFT
  172. rsbip,ip,#0
  173. movsip,ip,lsr#32-PAGE_SHIFT
  174. beq.cfu_3fupi
  175. cmpr2,ip
  176. movltip,r2
  177. subr2,r2,ip
  178. subsip,ip,#16
  179. blt.cfu_3rem8lp
  180. PLD(pld[r1,#12])
  181. PLD(pld[r0,#12])
  182. PLD(subsip,ip,#32)
  183. PLD(blt.cfu_3cpynopld)
  184. PLD(pld[r1,#28])
  185. PLD(pld[r0,#28])
  187. .cfu_3cpy8lp:
  188. PLD(pld[r1,#44])
  189. PLD(pld[r0,#44])
  190. .cfu_3cpynopld:movr3,r7,pull#24
  191. ldmiar1!,{r4-r7}@Shouldntfault
  192. orrr3,r3,r4,push#8
  193. movr4,r4,pull#24
  194. orrr4,r4,r5,push#8
  195. movr5,r5,pull#24
  196. orrr5,r5,r6,push#8
  197. movr6,r6,pull#24
  198. orrr6,r6,r7,push#8
  199. stmiar0!,{r3-r6}
  200. subsip,ip,#16
  201. bpl.cfu_3cpy8lp
  202. PLD(cmnip,#32)
  203. PLD(bge.cfu_3cpynopld)
  204. PLD(addip,ip,#32)
  206. .cfu_3rem8lp:tstip,#8
  207. movner3,r7,pull#24
  208. ldmneiar1!,{r4,r7}@Shouldntfault
  209. orrner3,r3,r4,push#8
  210. movner4,r4,pull#24
  211. orrner4,r4,r7,push#8
  212. stmneiar0!,{r3-r4}
  213. tstip,#4
  214. movner3,r7,pull#

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