https://sourceware.org/bugzilla/show_bug.cgi?id=24633
Bug ID: 24633
Summary: gas/objdump accepts invalid encoding for vextractf32x8
(possibly others).
Product: binutils
Version: 2.32
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: hgreving at google dot com
Target Milestone: ---
objdump does not check the vector length of vextractf32x8
main.s:
.byte 0x62
.byte 0xf3
.byte 0x7d
.byte 0x28
.byte 0x1b
.byte 0xc8
.byte 0x25
as-new --64 main.s
objdump -d a.out
[..]
59: 62 f3 7d 28 1b c8 25 vextractf32x8 $0x25,%ymm1,%xmm0
Intel's manual only lists the EVEX.LL' form (zmm source and ymm destination)
llvm-mc for example is correct:
echo '0x62 0xf3 0x7d 0x28 0x1b 0xc8 0x25' | llvm-mc-7 --disassemble
-triple=x86_64
.text
<stdin>:1:1: warning: invalid instruction encoding
0x62 0xf3 0x7d 0x28 0x1b 0xc8 0x25
^
<stdin>:1:26: warning: invalid instruction encoding
0x62 0xf3 0x7d 0x28 0x1b 0xc8 0x25
^
<stdin>:1:31: warning: invalid instruction encoding
0x62 0xf3 0x7d 0x28 0x1b 0xc8 0x25
^
and
echo '0x62 0xf3 0x7d 0x48 0x1b 0xc8 0x25' | llvm-mc-7 --disassemble
-triple=x86_64
.text
vextractf32x8 $37, %zmm1, %ymm0
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