Closed
Bug 1756839
Opened 3 years ago
Closed 3 years ago
Incorrect assembling of instruction cmpb imm8, reg
Categories
(Core :: JavaScript Engine: JIT, defect)
Core
JavaScript Engine: JIT
Tracking
()
RESOLVED
FIXED
99 Branch
| Tracking | Status | |
|---|---|---|
| firefox99 | --- | fixed |
People
(Reporter: lukas.bernhard, Assigned: lukas.bernhard)
References
(Blocks 1 open bug)
Details
Attachments
(1 file)
Steps to reproduce:
The cmpb_ir function in BaseAssembler-x86-shared.h uses OP_GROUP1_EvIb instead of OP_GROUP1_EbIb. This causes emission of an unintended instruction, e.g. cmpd 0xffffffff, r8d instead of cmpb 0xff, r8b.
Currently, this code path is never hit (but it might be in the future).
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Assignee | |
Updated•3 years ago
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Component: Untriaged → JavaScript Engine: JIT
Product: Firefox → Core
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Assignee | |
Comment 1•3 years ago
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Updated•3 years ago
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Assignee: nobody → lukas.bernhard
Status: NEW → ASSIGNED
Pushed by jdemooij@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/72290b9c841c
Fix assembling of cmpb imm8, reg. r=jandem
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Comment 3•3 years ago
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| bugherder | ||
Status: ASSIGNED → RESOLVED
Closed: 3 years ago
status-firefox99:
--- → fixed
Resolution: --- → FIXED
Target Milestone: --- → 99 Branch
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Updated•3 years ago
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Blocks: l11d-js-fuzzing
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Description
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