[Webkit-unassigned] [Bug 171118] New: X86-64 aassembler doesn't handle xchg with byte register src
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Fri Apr 21 10:29:50 PDT 2017
https://bugs.webkit.org/show_bug.cgi?id=171118
Bug ID: 171118
Summary: X86-64 aassembler doesn't handle xchg with byte
register src
Product: WebKit
Version: Other
Hardware: Unspecified
OS: Unspecified
Status: ASSIGNED
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: msaboff at apple.com
The Intel manual Vol 2A 3-3 shows that byte registers SPL and greater require a REX prefix byte. The is done with the X86Assembler function oneByteOp8(). Use of that function was omitted when the xchg8_*() functions was added.
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