Open
Bug 897470
Opened 11 years ago
Updated 2 years ago
Support asm.js using intel MPX instructions
Categories
(Core :: JavaScript Engine, defect)
Tracking
()
NEW
People
(Reporter: jrmuizel, Unassigned)
References
(Blocks 1 open bug)
Details
(Whiteboard: [platform-rel-Intel])
From my quick read of the specification (http://software.intel.com/sites/default/files/319433-015.pdf), these instructions seem reasonably well suited to the bounds checking needs of asm.js. They allow specifying a lower and upper bound such that all memory accesses outside of that bound will throw a bound range exception. Emulation of these instructions is supported with the Intel Software Development Emulator.
This looks interesting. On a quick first reading, I'm a little disappointed that MPX seems to require explicit bounds-check instructions instead of adding a prefix on load/store instructions (which is what I hoped). Since we don't require any explicit bounds checking on x64, I expect this would only benefit x86. By the time these instructions roll out in new processors, though, I wonder if we wouldn't be shipping FF 64-bit, though ;)
Assignee | ||
Updated•10 years ago
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Assignee: general → nobody
Updated•8 years ago
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Whiteboard: [platform-rel-Intel]
Updated•8 years ago
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platform-rel: --- → ?
Updated•7 years ago
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platform-rel: ? → ---
Updated•7 years ago
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Blocks: exploit-mitigation
Updated•2 years ago
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Severity: normal → S3
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Description
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