x86调用机器码

Question

我查了intel的文档，上面说

在absolute间接调用near中，"FF /2"这个“/2”是什么意思？ 2 个字节还是其他？我想知道关于 "call proc" 机器代码的整个列表，例如：

1: e8 xx xx xx xx --> near call relative
2: ff 15 xx xx xx xx --> near call absolute
3: ff 50 xx --> near call by reg

此致！非常感谢！

Answer 1

我使用 distorm 来显示结果，写一个循环来创建像这样的机器代码：ff 01 xx xx xx xx - ff ff xx xx xx xx

ff1012344500 (0L, 2L, 'CALL DWORD [EAX]', 'ff10')
ff1112344500 (0L, 2L, 'CALL DWORD [ECX]', 'ff11')
ff1212344500 (0L, 2L, 'CALL DWORD [EDX]', 'ff12')
ff1312344500 (0L, 2L, 'CALL DWORD [EBX]', 'ff13')
ff1412344500 (0L, 3L, 'CALL DWORD [EDX+EDX]', 'ff1412')
ff1512344500 (0L, 6L, 'CALL DWORD [0x453412]', 'ff1512344500')
ff1612344500 (0L, 2L, 'CALL DWORD [ESI]', 'ff16')
ff1712344500 (0L, 2L, 'CALL DWORD [EDI]', 'ff17')

ff5012344500 (0L, 3L, 'CALL DWORD [EAX+0x12]', 'ff5012')
ff5112344500 (0L, 3L, 'CALL DWORD [ECX+0x12]', 'ff5112')
ff5212344500 (0L, 3L, 'CALL DWORD [EDX+0x12]', 'ff5212')
ff5312344500 (0L, 3L, 'CALL DWORD [EBX+0x12]', 'ff5312')
ff5412344500 (0L, 4L, 'CALL DWORD [EDX+EDX+0x34]', 'ff541234')
ff5512344500 (0L, 3L, 'CALL DWORD [EBP+0x12]', 'ff5512')
ff5612344500 (0L, 3L, 'CALL DWORD [ESI+0x12]', 'ff5612')
ff5712344500 (0L, 3L, 'CALL DWORD [EDI+0x12]', 'ff5712')

ff9012344500 (0L, 6L, 'CALL DWORD [EAX+0x453412]', 'ff9012344500')
ff9112344500 (0L, 6L, 'CALL DWORD [ECX+0x453412]', 'ff9112344500')
ff9212344500 (0L, 6L, 'CALL DWORD [EDX+0x453412]', 'ff9212344500')
ff9312344500 (0L, 6L, 'CALL DWORD [EBX+0x453412]', 'ff9312344500')
ff9412344500 (0L, 1L, 'DB 0xff', 'ff')
ff9512344500 (0L, 6L, 'CALL DWORD [EBP+0x453412]', 'ff9512344500')
ff9612344500 (0L, 6L, 'CALL DWORD [ESI+0x453412]', 'ff9612344500')
ff9712344500 (0L, 6L, 'CALL DWORD [EDI+0x453412]', 'ff9712344500')

ffd012344500 (0L, 2L, 'CALL EAX', 'ffd0')
ffd112344500 (0L, 2L, 'CALL ECX', 'ffd1')
ffd212344500 (0L, 2L, 'CALL EDX', 'ffd2')
ffd312344500 (0L, 2L, 'CALL EBX', 'ffd3')
ffd412344500 (0L, 2L, 'CALL ESP', 'ffd4')
ffd512344500 (0L, 2L, 'CALL EBP', 'ffd5')
ffd612344500 (0L, 2L, 'CALL ESI', 'ffd6')
ffd712344500 (0L, 2L, 'CALL EDI', 'ffd7')

上面的结果列表是绝对近调用，相对近调用是e8 xx xx xx xx，在win32中我不关心远调用

x86调用机器码

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machine-code