[Nasm-bugs] [Bug 3392681] New: movdir64b causes panic
noreply-nasm at dev.nasm.us
noreply-nasm at dev.nasm.us
Sat Jun 20 18:45:36 PDT 2020
https://bugzilla.nasm.us/show_bug.cgi?id=3392681
Bug ID: 3392681
Summary: movdir64b causes panic
Product: NASM
Version: 2.14.xx
Hardware: PC
OS: Linux
Status: OPEN
Severity: normal
Priority: Medium
Component: Assembler
Assignee: nobody at nasm.us
Reporter: philip.lantz at intel.com
CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
hpa at zytor.com, nasm-bugs at nasm.us
Obtained from: Build from source archive using configure
Use of movdir64b instruction causes nasm to panic.
$ cat n.s
bits 64
movdir64b rax, [rdi]
$ nasm -f elf64 n.s
n.s:2: panic: assertion data.insoffs == insn_size failed at asm/assemble.c:754
$ nasm -version
NASM version 2.14.02 compiled on Jun 20 2020
Based on a little investigation, it seems that the calcsize function
incorrectly thinks that a REX prefix is required and calculates the size of the
instruction as 6 instead of 5.
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