https://sourceware.org/bugzilla/show_bug.cgi?id=23230
Bug ID: 23230
Summary: aarch64: objdump disassembles invalid mrs
Product: binutils
Version: 2.30
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: i-bugzilla-sourceware-org-kasujfzh at rf dot risimo.net
Target Milestone: ---
$ cat mrs.asm
.global main
.section .text
.balign 4
main:
mrs x0,s0_0_c0_c4_3
.inst 0xd5200460
.inst 0xd5300460
ret
$ as -mcpu=saphira -o mrs.o mrs.asm
$ objdump -d mrs.o
mrs.o: file format elf64-littleaarch64
Disassembly of section .text:
0000000000000000 <main>:
0: d5200460 mrs x0, s0_0_c0_c4_3
4: d5200460 mrs x0, s0_0_c0_c4_3
8: d5300460 mrs x0, s2_0_c0_c4_3
c: d65f03c0 ret
$
The MRS requires that bit 20 is set. However in 0xd5200460 the bit is not set
and objdump should return ".inst 0xd5200460".
Related problem is that the S value should be either 2 or 3 (depending on bit
o0) but not like in the above case.
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