https://sourceware.org/bugzilla/show_bug.cgi?id=25279
Bug ID: 25279
Summary: vmload/vmrun/vmsave: objdump -d should print the
operand %rax
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: i at maskray dot me
Target Milestone: ---
% cat a.s
vmload %rax
vmrun %rax
vmsave %rax
% as a.s -o a.o
% objdump -d a.o
a.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: 0f 01 da vmload
3: 0f 01 d8 vmrun
6: 0f 01 db vmsave
In AMD64 Architecture. Programmer's Manual. Volume 2: System Programming
(https://www.amd.com/system/files/TechDocs/24593.pdf), rAX is specified as a
required operand.
> Instruction Encoding
> Mnemonic Opcode Description
> VMSAVE rAX 0F 01 DB Save additional guest state to VMCB.
While gas may accept vmload/vmrun/vmsave with an implicit %rax (currently
https://patchwork.kernel.org/patch/10822711/ makes use of this abbreviation),
objdump -d should probably decode them with an explicit %rax.
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