Unity3d IL2CPP 内存对齐错误

[TOC]

unity3d il2cpp安卓包运行异常，出现信号错误signal 7 (SIGBUS), code 1 (BUS_ADRALN)。

03-26 10:49:24.270 20868 20887 E CRASH   : signal 7 (SIGBUS), code 1 (BUS_ADRALN), fault addr ba77601a
03-26 10:49:24.270 20868 20887 E CRASH   : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
03-26 10:49:24.270 20868 20887 E CRASH   : Build type 'Release', Scripting Backend 'il2cpp', CPU 'armeabi-v7a'
03-26 10:49:24.270 20868 20887 E CRASH   : Build fingerprint: 'Xiaomi/perseus/perseus:9/PKQ1.180729.001/V10.0.12.0.PEECNFH:user/release-keys'
03-26 10:49:24.270 20868 20887 E CRASH   : Revision: '0'
03-26 10:49:24.270 20868 20887 E CRASH   : pid: 20868, tid: 20887, name: UnityMain  >>> com.abc.test <<<
03-26 10:49:24.270 20868 20887 E CRASH   :     r0 ba776010  r1 ba776000  r2 0000001a  r3 00000012
03-26 10:49:24.270 20868 20887 E CRASH   :     r4 4b0ac5ca  r5 ba77601a  r6 6f746306  r7 b99e1114
03-26 10:49:24.270 20868 20887 E CRASH   :     r8 baf50f20  r9 00000009  sl 0000011d  fp cc6fdd60
03-26 10:49:24.270 20868 20887 E CRASH   :     ip 0000011a  sp cc6fdd48  lr b5f0747f  pc c9e0a41c  cpsr cc6fda58
03-26 10:49:24.270 20868 20887 E CRASH   : 
03-26 10:49:24.270 20868 20887 E CRASH   : backtrace:
03-26 10:49:24.359 20868 20887 E CRASH   : 	#00  pc 01ff041c  /data/app/com.abc.test-MvkG0JyKHMrwrsDCO2D2Ig==/lib/arm/libil2cpp.so
03-26 10:49:24.359 20868 20887 E CRASH   : 	#01  pc 01feff88  /data/app/com.abc.test-MvkG0JyKHMrwrsDCO2D2Ig==/lib/arm/libil2cpp.so
03-26 10:49:24.359 20868 20887 E CRASH   : 	#02  pc 01ff05dc  /data/app/com.abc.test-MvkG0JyKHMrwrsDCO2D2Ig==/lib/arm/libil2cpp.so
03-26 10:49:24.359 20868 20887 E CRASH   : 	#03  pc 01f7b6c4  /data/app/com.abc.test-MvkG0JyKHMrwrsDCO2D2Ig==/lib/arm/libil2cpp.so
03-26 10:49:24.359 20868 20887 E CRASH   : 	#04  pc 0072142c  /data/app/com.abc.test-MvkG0JyKHMrwrsDCO2D2Ig==/lib/arm/libil2cpp.so
03-26 10:49:24.359 20868 20887 E CRASH   : 
03-26 10:49:24.359 20868 20887 E CRASH   : memory near r0:
03-26 10:49:24.359 20868 20887 E CRASH   :     ba775ff0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.359 20868 20887 E CRASH   :     ba776000 c15bb748 00000000 00000000 00100000  H.[.............
03-26 10:49:24.359 20868 20887 E CRASH   :     ba776010 1d445957 0a000001 63060101 656b6f74  abc........ctoke
03-26 10:49:24.359 20868 20887 E CRASH   :     ba776020 00040c6e 00363838 74656e07 65646f4d  n...886..netMode
03-26 10:49:24.359 20868 20887 E CRASH   :     ba776030 00000106 736f0200 7000030c 6e060063  ......os...pc..n
03-26 10:49:24.359 20868 20887 E CRASH   :     ba776040 65626d75 00010c72 77700300 00040c72  umber.....pwr...
03-26 10:49:24.359 20868 20887 E CRASH   :     ba776050 00363838 7070610a 73726556 0c6e6f69  886..appVersion.
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776060 2e310006 00302e30 63636107 6f666e49  ..1.0.0..accInfo
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776070 0000010c 736f6804 00050c74 656e6f6e  .....host...none
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776080 72610600 64496165 00000106 6f630400  ..areaId......co
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776090 010c6564 640b0000 63697665 6f635365  de.....deviceSco
03-26 10:49:24.360 20868 20887 E CRASH   :     ba7760a0 00066572 08000000 69766564 64496563  re......deviceId
03-26 10:49:24.360 20868 20887 E CRASH   :     ba7760b0 0000010c 64696303 3000020c 68700900  .....cid...0..ph
03-26 10:49:24.360 20868 20887 E CRASH   :     ba7760c0 4d656e6f 0c65646f 0a000001 65527369  oneMode.....isRe
03-26 10:49:24.360 20868 20887 E CRASH   :     ba7760d0 74736967 00057265 0c777002 64640021  gister...pw.!.dd
03-26 10:49:24.360 20868 20887 E CRASH   :     ba7760e0 34306464 39626234 30616432 39393130  dd044bb92da00199
03-26 10:49:24.360 20868 20887 E CRASH   : 
03-26 10:49:24.360 20868 20887 E CRASH   : memory near r1:
03-26 10:49:24.360 20868 20887 E CRASH   :     ba775fe0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.360 20868 20887 E CRASH   :     ba775ff0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776000 c15bb748 00000000 00000000 00100000  H.[.............
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776010 1d445957 0a000001 63060101 656b6f74  abc........ctoke
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776020 00040c6e 00363838 74656e07 65646f4d  n...886..netMode
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776030 00000106 736f0200 7000030c 6e060063  ......os...pc..n
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776040 65626d75 00010c72 77700300 00040c72  umber.....pwr...
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776050 00363838 7070610a 73726556 0c6e6f69  886..appVersion.
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776060 2e310006 00302e30 63636107 6f666e49  ..1.0.0..accInfo
03-26 10:49:24.360 20868 20887 E CRASH   :     ba776070 0000010c 736f6804 00050c74 656e6f6e  .....host...none
03-26 10:49:24.361 20868 20887 E CRASH   :     ba776080 72610600 64496165 00000106 6f630400  ..areaId......co
03-26 10:49:24.361 20868 20887 E CRASH   :     ba776090 010c6564 640b0000 63697665 6f635365  de.....deviceSco
03-26 10:49:24.361 20868 20887 E CRASH   :     ba7760a0 00066572 08000000 69766564 64496563  re......deviceId
03-26 10:49:24.361 20868 20887 E CRASH   :     ba7760b0 0000010c 64696303 3000020c 68700900  .....cid...0..ph
03-26 10:49:24.361 20868 20887 E CRASH   :     ba7760c0 4d656e6f 0c65646f 0a000001 65527369  oneMode.....isRe
03-26 10:49:24.361 20868 20887 E CRASH   :     ba7760d0 74736967 00057265 0c777002 64640021  gister...pw.!.dd
03-26 10:49:24.361 20868 20887 E CRASH   : 
03-26 10:49:24.361 20868 20887 E CRASH   : memory near r4:
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac5a8 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac5b8 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac5c8 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac5d8 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac5e8 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac5f8 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac608 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac618 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac628 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac638 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.361 20868 20887 E CRASH   :     4b0ac648 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.362 20868 20887 E CRASH   :     4b0ac658 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.362 20868 20887 E CRASH   :     4b0ac668 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.362 20868 20887 E CRASH   :     4b0ac678 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.362 20868 20887 E CRASH   :     4b0ac688 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.362 20868 20887 E CRASH   :     4b0ac698 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.362 20868 20887 E CRASH   : 
03-26 10:49:24.362 20868 20887 E CRASH   : memory near r5:
03-26 10:49:24.362 20868 20887 E CRASH   :     ba775ff8 00000000 00000000 c15bb748 00000000  ........H.[.....
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776008 00000000 00100000 1d445957 0a000001  ........abc.....
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776018 63060101 656b6f74 00040c6e 00363838  ...ctoken...886.
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776028 74656e07 65646f4d 00000106 736f0200  .netMode......os
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776038 7000030c 6e060063 65626d75 00010c72  ...pc..number...
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776048 77700300 00040c72 00363838 7070610a  ..pwr...886..app
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776058 73726556 0c6e6f69 2e310006 00302e30  Version...1.0.0.
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776068 63636107 6f666e49 0000010c 736f6804  .accInfo.....hos
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776078 00050c74 656e6f6e 72610600 64496165  t...none..areaId
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776088 00000106 6f630400 010c6564 640b0000  ......code.....d
03-26 10:49:24.362 20868 20887 E CRASH   :     ba776098 63697665 6f635365 00066572 08000000  eviceScore......
03-26 10:49:24.362 20868 20887 E CRASH   :     ba7760a8 69766564 64496563 0000010c 64696303  deviceId.....cid
03-26 10:49:24.362 20868 20887 E CRASH   :     ba7760b8 3000020c 68700900 4d656e6f 0c65646f  ...0..phoneMode.
03-26 10:49:24.363 20868 20887 E CRASH   :     ba7760c8 0a000001 65527369 74736967 00057265  ....isRegister..
03-26 10:49:24.363 20868 20887 E CRASH   :     ba7760d8 0c777002 64640021 34306464 39626234  .pw.!.dddd044bb9
03-26 10:49:24.363 20868 20887 E CRASH   :     ba7760e8 30616432 39393130 39353733 36363066  2da001993759f066
03-26 10:49:24.363 20868 20887 E CRASH   : 
03-26 10:49:24.363 20868 20887 E CRASH   : memory near r6:
03-26 10:49:24.363 20868 20887 E CRASH   :     6f7462e4 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f7462f4 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746304 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746314 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746324 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746334 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746344 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746354 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746364 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746374 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746384 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f746394 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f7463a4 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.363 20868 20887 E CRASH   :     6f7463b4 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     6f7463c4 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     6f7463d4 ffffffff ffffffff ffffffff ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   : 
03-26 10:49:24.364 20868 20887 E CRASH   : memory near r7:
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e10f4 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1104 0000000a 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1114 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1124 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1134 0000001d 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1144 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1154 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1164 00000013 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1174 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1184 00000000 00000000 00000000 ffffffff  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e1194 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e11a4 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e11b4 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e11c4 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e11d4 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.364 20868 20887 E CRASH   :     b99e11e4 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.364 20868 20887 E CRASH   : 
03-26 10:49:24.364 20868 20887 E CRASH   : memory near r8:
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f00 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f10 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f20 c18e2400 00000000 00000001 bd0c2440  .$..........@$..
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f30 bd2b5eb0 bd2b5e88 e9548210 e9548540  .^+..^+...T.@.T.
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f40 bd03ce60 0000868d bac60ed8 bcae4480  `............D..
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f50 e9548240 00000005 00000003 bac60ed8  @.T.............
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f60 0000868d e9547fa0 ffffffff 00000000  ......T.........
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f70 00000000 bd0c2280 00000000 00000001  ....."..........
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f80 bd0c2740 baf25240 bac5fee0 bac5fea8  @'..@R..........
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50f90 baf3ec30 00000000 247ea6cc b5f0747f  0.........~$.t..
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50fa0 bd275060 baee2840 baee2828 00000000  `P'.@(..((......
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50fb0 baf3aa50 baf25210 baf4bf80 00000000  P....R..........
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50fc0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50fd0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50fe0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.365 20868 20887 E CRASH   :     baf50ff0 00000000 00000000 00000000 00000000  ................
03-26 10:49:24.365 20868 20887 E CRASH   : 
03-26 10:49:24.365 20868 20887 E CRASH   : code around pc:
03-26 10:49:24.365 20868 20887 E CRASH   :     c9e0a3fc e1a03002 ea000013 e1a05000 e7b56002  .0.......P...`..
03-26 10:49:24.365 20868 20887 E CRASH   :     c9e0a40c e2822010 e5957004 e0264004 e027700e  . ...p...@&..p'.
03-26 10:49:24.365 20868 20887 E CRASH   :     c9e0a41c e8850090 ea000009 e1a02000 e59d6000  ......... ...`..
03-26 10:49:24.365 20868 20887 E CRASH   :     c9e0a42c e7b27003 e59d5004 e5924004 e0266007  .p...P...@...`&.
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a43c e0257004 e1c260f0 e2832010 e2833008  .p%..`... ...0..
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a44c e152000c dafffff3 e153000c aa00000e  ..R.......S.....
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a45c e0800003 e04c2003 e3a04000 e1a0300d  ..... L..@...0..
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a46c e5d07000 e2522001 e7d46003 e0267007  .p... R..`...p&.
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a47c e4c07001 e2847001 e1a06fc7 e0876ea6  .p...p...o...n..
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a48c e3c66007 e0474006 1afffff4 e1a00001  .`...@G.........
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a49c e24bd010 e8bd88f0 e92d4df0 e28db018  ..K......M-.....
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a4ac e24dd008 e1a05000 e59f0220 e1a04003  ..M..P.. ....@..
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a4bc e1a06002 e08f0000 e1a07001 e5d00000  .`.......p......
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a4cc e3500000 1a000006 e59f0204 e79f0000  ..P.............
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a4dc e5900000 ebf1c6b5 e59f01f8 e3a01001  ................
03-26 10:49:24.366 20868 20887 E CRASH   :     c9e0a4ec e7cf1000 e3540000 0a000002 e6ef0077  ......T.....w...
03-26 10:49:24.366 20868 20887 E CRASH   : 
03-26 10:49:24.366 20868 20887 E CRASH   : code around lr:
03-26 10:49:24.366 20868 20887 E CRASH   :     b5f0745c b5f1a120 c7527360 00000000 06001531   ...`sR.....1...
03-26 10:49:24.366 20868 20887 E CRASH   :     b5f0746c 00802096 0001ffff c81c2a38 c9c8f0e0  . ......8*......
03-26 10:49:24.366 20868 20887 E CRASH   :     b5f0747c c723d06c c18df5c0 ca68dd18 b5f19020  l.#.......h. ...
03-26 10:49:24.366 20868 20887 E CRASH   :     b5f0748c c7527394 00000000 06001532 00802096  .sR.....2.... ..
03-26 10:49:24.366 20868 20887 E CRASH   :     b5f0749c 0000ffff c81c2b40 c9cc8744 c723d081  ....@+..D.....#.
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f074ac c18df5c0 ca68dd18 b5f1a130 c75273c8  ......h.0....sR.
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f074bc 00000000 06001533 00802096 0001ffff  ....3.... ......
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f074cc c81c2c58 c9cc8744 c723d096 c18df5c0  X,..D.....#.....
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f074dc ca68dd18 b5f1a140 c75273fc 00000000  ..h.@....sR.....
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f074ec 06001534 00802096 0001ffff c81c2d70  4.... ......p-..
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f074fc c9cc8744 c723d0aa c18df5c0 ca68dd18  D.....#.......h.
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f0750c b5f1a150 c7527430 00000000 06001535  P...0tR.....5...
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f0751c 00802096 0001ffff c81c2e88 c9cc86e0  . ..............
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f0752c c723d0c0 c18df5c0 ca68dd18 b53393c0  ..#.......h...3.
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f0753c c7527464 00000000 06001536 00802096  dtR.....6.... ..
03-26 10:49:24.367 20868 20887 E CRASH   :     b5f0754c 0002ffff c81c2fb0 c9cc8dd0 c723d0da  ...../........#.
03-26 10:49:24.367 20868 20887 E MessageQueue: IdleHandler threw exception

异常代码出现在unity3d c#一处指针操作。为了更快的效率，我使用指针每8个字节进行一次异或运算，代码大概如下：

// do something here

fixed (byte* pData = data)
{
    // do something here
    while (i + UINT64_SIZE <= end)
    {
        i64lhs = (ulong*)(pData + i);
        *i64lhs ^= key;
        i += UINT64_SIZE;
    }
    
    // do something here
}

然而unity mono并不会该问题，il2cpp下的android、ios均会出现类似的信号错误signal 7 (SIGBUS), code 1 (BUS_ADRALN)，实际情况是，i64lhs = (ulong*)(pData + i);进行了未对齐的地址访问。
以下是一些作者对未对齐的地址访问的理解

某些架构上访问数据时有对齐的要求，比如只能从4字节边界上读取一个4字节的数据类型。IA-32架构没有硬性要求对齐，尽管未对齐的访问降低执行效率。另外一些架构，比如SPARC、m68k，要求对齐访问，否则向当前进程分发SIGBUS信号。1

Win32平台下的微软VC编译器在默认情况下采用如下的对齐规则: 任何基本数据类型T的对齐模数就是T的大小，即sizeof(T)。比如对于double类型(8字节)，就要求该类型数据的地址总是8的倍数，而char类型数据(1字节)则可以从任何一个地址开始。Linux下的GCC奉行的是另外一套规则:任何2字节大小(包括单字节吗?)的数据类型(比如short)的对齐模数是2，而其它所有超过2字节的数据类型(比如long,double)都以4为对齐模数。2

根据C标准中的说明：“完整的对象类型需要满足对齐要求，这会限制该类型的对象可能分配的地址。对齐值是由具体实现所定义的一个整数值，表示给定对象所能分配的连续地址之间对应的字节数”。换句话说，这意味着我们必须满足如下条件： V % (alignof(uint64_t)) == 0 同样根据C标准，将指针从某种类型转化为另一种类型，而不遵守这个对齐规则时属于未定义的行为3


对于android x86和x86-64来说并不会有问题，因为intel架构支持非内存访问，但对arm来说是强制要求3。
但目前大多数android是arm架构，程序包含natie code务必注意该问题。



原文:
https://lizijie.github.io/2019/04/13/Unity3d-IL2CPP-%E5%86%85%E5%AD%98%E5%AF%B9%E9%BD%90%E9%94%99%E8%AF%AF.html

作者github:
https://github.com/lizijie </b>

  1. https://blog.csdn.net/codejoker/article/details/4543136 ↩

  2. http://www.cnblogs.com/mlj318/p/6089001.html ↩

  3. https://xz.aliyun.com/t/3045 ↩ ↩2

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