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Commit | Line | Data |
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1 | commit 1ab61656f71e94ce12b68de87f1e28cf3dc0c18c | |
2 | Author: mjw <mjw@8f6e269a-dfd6-0310-a8e1-e2731360e62c> | |
3 | Date: Thu Oct 1 12:31:19 2015 +0000 | |
4 | ||
5 | Don't advertise RDRAND in cpuid for Core-i7-4910-like avx2 machine. | |
6 | ||
7 | Bug#353370. In amd64g_dirtyhelper_CPUID_avx2 we set the RDRAND bit | |
8 | but we don't implement support for RDRAND. Turn the bit off so programs | |
9 | don't try to use RDRAND when running under valgrind. | |
10 | ||
11 | git-svn-id: svn://svn.valgrind.org/vex/trunk@3197 8f6e269a-dfd6-0310-a8e1-e2731360e62c | |
12 | ||
13 | diff --git a/VEX/priv/guest_amd64_helpers.c b/VEX/priv/guest_amd64_helpers.c | |
14 | index e77d753..ab53e15 100644 | |
15 | --- a/VEX/priv/guest_amd64_helpers.c | |
16 | +++ b/VEX/priv/guest_amd64_helpers.c | |
17 | @@ -3101,7 +3101,8 @@ void amd64g_dirtyhelper_CPUID_avx2 ( VexGuestAMD64State* st ) | |
18 | SET_ABCD(0x0000000d, 0x756e6547, 0x6c65746e, 0x49656e69); | |
19 | break; | |
20 | case 0x00000001: | |
21 | - SET_ABCD(0x000306c3, 0x02100800, 0x7ffafbff, 0xbfebfbff); | |
22 | + /* Don't advertise RDRAND support, bit 30 in ECX. */ | |
23 | + SET_ABCD(0x000306c3, 0x02100800, 0x3ffafbff, 0xbfebfbff); | |
24 | break; | |
25 | case 0x00000002: | |
26 | SET_ABCD(0x76036301, 0x00f0b6ff, 0x00000000, 0x00c10000); |