问题描述
CPUID说，我有我的rdrand系统上，但rdrand指令抛出SIGILL。我使用的VMware Workstation 11里Linux Mint的，我用Google搜索工作站支持rdrand，他们说，自从9日的版本，它启用。主持人Proccess是i5-2550k，它应该支持rdrand。我能以某种方式解决这一问题？下面是GDB上市：
断点1，在0x08048060 _start（）
（GDB）X / 5I $ EIP= GT; 0x8048060＆LT; _start计算值：MOV $为0x1，％eax中 0x8048065＆LT; _start + 5计算值：CPUID 0x8048067＆LT; _start + 7计算值：rdrand％EAX 0x804806a＆LT; _start + 10计算值：MOV $为0x1，％eax中 0x804806f＆LT; _start + 15计算值：INT $ 0x80的（GDB）SI 20x08048067在_start（）（GDB）P / T $ ECX$ 1 = 10011111101110100010001000000011; 30位设置 - 启用rdrand。（GDB）P / T $ EBX$ 2 = 100001000亿（GDB）P / T $ EAX$ 3 = 100000011010100111（GDB）SI
程序接收到的信号SIGILL，非法指令。0x08048067在_start（）断点1，在0x08048060 _start（）（GDB）X / 5I $ EIP= GT; 0x8048060＆LT; _start计算值：MOV $为0x1，％eax中 0x8048065＆LT; _start + 5计算值：CPUID 0x8048067＆LT; _start + 7计算值：rdrand％EAX 0x804806a＆LT; _start + 10计算值：MOV $为0x1，％eax中 0x804806f＆LT; _start + 15计算值：INT $ 0x80的（GDB）SI 20x08048067在_start（）（GDB）P / T $ ECX$ 1 = 10011111101110100010001000000011（GDB）P / T $ EBX$ 2 = 100001000亿（GDB）P / T $ EAX$ 3 = 100000011010100111（GDB）SI
程序接收到的信号SIGILL，非法指令。0x08048067在_start（）
您已经阅读了ECX登记错了。该RDRAND位未设置。位30是从左侧的第二位：
10011111101110100010001000000011
^
30位^位0
上面的图像从英特尔64和IA-32架构软件开发人员手册中的CPUID指令说明服用。
此外，您的i5-2550K CPU是Sandy Bridge处理器。 RDRAND没有出台，直到下一代英特尔处理器，Ivy Bridge的。
Cpuid says that I have rdrand on my system, but rdrand instruction throws sigill. I'm using linux mint inside VmWare workstation 11, I googled workstation support of rdrand, and they say that it enabled since 9th version. Proccess of host is i5-2550k and it should support rdrand. Can I somehow fix this? Here is gdb listing:
Breakpoint 1, 0x08048060 in _start ()
(gdb) x/5i $eip
=> 0x8048060 <_start>: mov $0x1,%eax
0x8048065 <_start+5>: cpuid
0x8048067 <_start+7>: rdrand %eax
0x804806a <_start+10>: mov $0x1,%eax
0x804806f <_start+15>: int $0x80
(gdb) si 2
0x08048067 in _start ()
(gdb) p/t $ecx
$1 = 10011111101110100010001000000011 ; bit 30 is set -- rdrand enabled.
(gdb) p/t $ebx
$2 = 10000100000000000
(gdb) p/t $eax
$3 = 100000011010100111
(gdb) si
Program received signal SIGILL, Illegal instruction.
0x08048067 in _start ()
Breakpoint 1, 0x08048060 in _start ()
(gdb) x/5i $eip
=> 0x8048060 <_start>: mov $0x1,%eax
0x8048065 <_start+5>: cpuid
0x8048067 <_start+7>: rdrand %eax
0x804806a <_start+10>: mov $0x1,%eax
0x804806f <_start+15>: int $0x80
(gdb) si 2
0x08048067 in _start ()
(gdb) p/t $ecx
$1 = 10011111101110100010001000000011
(gdb) p/t $ebx
$2 = 10000100000000000
(gdb) p/t $eax
$3 = 100000011010100111
(gdb) si
Program received signal SIGILL, Illegal instruction.
0x08048067 in _start ()
You've read the ECX register wrong. The RDRAND bit is not set. Bit 30 is the second bit from the left:
10011111101110100010001000000011
^
Bit 30 ^ Bit 0
The above image is taken from the CPUID instruction description given in the Intel 64 and IA-32 Architectures Software Developer’s Manual.
Also your i5-2550K CPU is a Sandy Bridge processor. RDRAND wasn't introduced until the next generation of Intel processors, Ivy Bridge.
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