| Summary: | vex amd64->IR: unhandled instruction bytes: 0xF 0x1 0x4D 0xF0 0xB8 0x0 ("sidt -0x10(%rbp)") | ||
|---|---|---|---|
| Product: | [Developer tools] valgrind | Reporter: | Alexander Potapenko <glider> |
| Component: | vex | Assignee: | Julian Seward <jseward> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | ||
| Priority: | NOR | ||
| Version: | 3.6 SVN | ||
| Target Milestone: | --- | ||
| Platform: | Unlisted Binaries | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Attachments: | A draft patch for the SIDT support in VEX on x86 and amd64 | ||
Created attachment 42525 [details]
A draft patch for the SIDT support in VEX on x86 and amd64
This is a very raw patch that implements the SIDT support via a dirty helper.
At the moment it's totally undocumented and doesn't decode the opcodes correctly (it does not tell SIDT from SGDT).
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$ uname -a Linux glider-box 2.6.24-gg804006-generic #1 SMP Tue Dec 22 15:27:33 PST 2009 x86_64 GNU/Linux $ cat sidt.c int main() { struct { unsigned short limit; unsigned long base; } __attribute__((packed)) idtr; __asm__ volatile( "sidt %0" : "=m" (idtr) ); return 0; } $ gcc sidt.c -o sidt $ ./sidt $ valgrind --tool=none ./sidt ==16739== Nulgrind, the minimal Valgrind tool ==16739== Copyright (C) 2002-2009, and GNU GPL'd, by Nicholas Nethercote. ==16739== Using Valgrind-3.6.0.SVN and LibVEX; rerun with -h for copyright info ==16739== Command: ./sidt ==16739== vex amd64->IR: unhandled instruction bytes: 0xF 0x1 0x4D 0xF0 0xB8 0x0 ==16739== valgrind: Unrecognised instruction at address 0x40044c. ... The instruction 0xF 0x1 0x4D 0xF0 is "sidt -0x10(%rbp)" Fixing this error would probably also fix the problems with running the threading tests on Snow Leopard, see https://bugs.kde.org/show_bug.cgi?id=205241#c29