shoelace源代码分析，bochs调试过程 -- loadbuilt()函数
Next at t=78037287
(0) [0x0006091d] 6000:091d (unk. ctxt): inc sp ; 44
<bochs:13> s
Next at t=78037288
(0) [0x0006091e] 6000:091e (unk. ctxt): lea bx, word ptr ss:[bp+0xfe62] ; 8d9e62fe
<bochs:14> s
Next at t=78037289
(0) [0x00060922] 6000:0922 (unk. ctxt): push bx ; 53
<bochs:15> s
Next at t=78037290
(0) [0x00060923] 6000:0923 (unk. ctxt): call 0xca7 ; e88103
<bochs:16> s
Next at t=78037291
(0) [0x00060ca7] 6000:0ca7 (unk. ctxt): push bp ; 55
<bochs:17>
所以我们可以在0x00060ca7下断点，直接到达loadbuilt()函数
也就是第八个断点！
第九个断点：0x60df4 对应函数loadimage()函数
<bochs:19> b 0x60df4
<bochs:20> c
(0) Breakpoint 4, 0x60df4 in ?? ()
Next at t=78037328
(0) [0x00060df4] 6000:0df4 (unk. ctxt): push bp ; 55
<bochs:21>
如果你直接在0x60df4 对应函数loadimage()函数，下断点，第一次是加载kernel
第二次是加载boot，我们这里是Image
第十个断点：
00060cd5: ( ): mov ax, 0x600 ; b80006
00060cd8: ( ): xor bx, bx ; 31db
00060cda: ( ): mov [ds:0x9f08], ax ; a3089f
00060cdd: ( ): mov word ptr [ds:0x9f0a], bx ; 891e0a9f
00060ce1: ( ): mov al, 0x1 ; b001
00060ce3: ( ): mov byte ptr [ds:0x9f0c], al ; a20c9f
00060ce6: ( ): mov bx, 0xe7e ; bb7e0e
00060ce9: ( ): push bx ; 53
00060cea: ( ): push word ptr ss:[bp+0x4] ; ff7604
00060ced: ( ): call 0xdf4 ; e80401
00060cf0: ( ): add sp, 0x4 ; 83c404
00060cf3: ( ): pop si ; 5e
00060cf4: ( ): pop di ; 5f
00060cf5: ( ): pop bp ; 5d
00060cf6: ( ): retn ; c3
0x60df4是函数：loadimage()函数，所以 0x60e7e为函数readkernel()函数，
[ds:0x9f08] = LoadPoint 0x69f08 4个字节 long
[ds:0x9f0c] = LoadStart 0x69f0c 一个字节 char
filesize 0x6aedc
<bochs:30> x 0x6aedc
[bochs]:
0x0006aedc <bogus+ 0>: 0x0001ea00
<bochs:31>
<bochs:25> x 0x69f08
[bochs]:
0x00069f08 <bogus+ 0>: 0x00010a00
<bochs:26> c
(0) Breakpoint 3, 0x60e7e in ?? ()
Next at t=78068330
(0) [0x00060e7e] 6000:0e7e (unk. ctxt): push bp ; 55
<bochs:27> x 0x69f08
[bochs]:
0x00069f08 <bogus+ 0>: 0x00010e00
<bochs:28>
可见每运行一次readkernel()函数，LoadPoint的值变增加1024，即一个逻辑块的大小。
<bochs:1> b 0x60e7e
<bochs:2> c
(0) Breakpoint 1, 0x60e7e in ?? ()
Next at t=78053092
(0) [0x00060e7e] 6000:0e7e (unk. ctxt): push bp ; 55
<bochs:3> x 0x69f08
[bochs]:
0x00069f08 <bogus+ 0>: 0x00000600
<bochs:4> c
(0) Breakpoint 1, 0x60e7e in ?? ()
Next at t=78055605
(0) [0x00060e7e] 6000:0e7e (unk. ctxt): push bp ; 55
<bochs:5> x 0x69f08
[bochs]:
0x00069f08 <bogus+ 0>: 0x00090400
<bochs:6> x /400 0x90000
[bochs]:
0x00090000 <bogus+ 0>: 0x8e07c0b8 0x9000b8d8 0x00b9c08e 0x29f62901
0x00090010 <bogus+ 16>: 0xeaa5f3ff 0x90000018 0xd88ec88c 0xd08ec08e
0x00090020 <bogus+ 32>: 0xbaff00bc 0x02b90000 0x0200bb00 0xcd0204b8
0x00090030 <bogus+ 48>: 0xba0a7313 0x00b80000 0xeb13cd00 0xb800b2e6
0x00090040 <bogus+ 64>: 0x13cd0800 0x892e00b5 0xb8013d0e 0xc08e9000
0x00090050 <bogus+ 80>: 0xff3003b4 0x18b910cd 0x0007bb00 0xb8013fbd
0x00090060 <bogus+ 96>: 0x10cd1301 0x8e1000b8 0x0032e8c0 0x2e00c5e8
0x00090070 <bogus+ 112>: 0x3d01fca1 0x17750000 0x3d1e8b2e 0x0208b801
0x00090080 <bogus+ 128>: 0x740ffb83 0x021cb80a 0x7412fb83 0x2efeeb02
0x00090090 <bogus+ 144>: 0xea01fca3 0x90200000 0x00000005 0xc08c0000
0x000900a0 <bogus+ 160>: 0x750fffa9 0x8cdb31fe 0x40003dc0 0x2ec30172
0x000900b0 <bogus+ 176>: 0x2b013da1 0x89009806 0x09e1c1c1 0x0973d901
0x000900c0 <bogus+ 192>: 0xc0310774 0xe8c1d829 0x0034e809 0x0603c189
0x000900d0 <bogus+ 208>: 0x3b2e0098 0x75013d06 0x0001b812 0x009a062b
0x000900e0 <bogus+ 224>: 0x06ff0475 0x9aa3009c 0xa3c03100 0xe1c10098
0x000900f0 <bogus+ 240>: 0x73cb0109 0x05c08cb2 0xc08e1000 0xa7ebdb31
0x00090100 <bogus+ 256>: 0x52515350 0x009c168b 0x00980e8b 0x8bd58841
0x00090110 <bogus+ 272>: 0x88009a16 0x8100b2d6 0xb40100e2 0x7213cd02
0x00090120 <bogus+ 288>: 0x5b595a05 0x00b8c358 0x0000ba00 0x595a13cd
0x00090130 <bogus+ 304>: 0xcceb585b 0x03f2ba52 0x5aee00b0 0x0d0000c3
0x00090140 <bogus+ 320>: 0x616f4c0a 0x676e6964 0x73797320 0x206d6574
0x00090150 <bogus+ 336>: 0x0d616161 0x000a0d0a 0x00000000 0x00000000
0x00090160 <bogus+ 352>: 0x00000000 0x00000000 0x00000000 0x00000000
0x00090170 <bogus+ 368>: 0x00000000 0x00000000 0x00000000 0x00000000
0x00090180 <bogus+ 384>: 0x00000000 0x00000000 0x00000000 0x00000000
0x00090190 <bogus+ 400>: 0x00000000 0x00000000 0x00000000 0x00000000
0x000901a0 <bogus+ 416>: 0x00000000 0x00000000 0x00000000 0x00000000
0x000901b0 <bogus+ 432>: 0x00000000 0x00000000 0x00000000 0x00000000
0x000901c0 <bogus+ 448>: 0x00000000 0x00000000 0x00000000 0x00000000
0x000901d0 <bogus+ 464>: 0x00000000 0x00000000 0x00000000 0x00000000
0x000901e0 <bogus+ 480>: 0x00000000 0x00000000 0x00000000 0x00000000
0x000901f0 <bogus+ 496>: 0x00000000 0x00000000 0x00000000 0xaa550301
所以我们的Image被加载到了0x90000，