https://sourceware.org/bugzilla/show_bug.cgi?id=25270
Bug ID: 25270
Summary: objdump hangs on specific aarch64 opcode
Product: binutils
Version: 2.33
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: chris.s.jones at gmail dot com
Target Milestone: ---
Created attachment 12119
--> https://sourceware.org/bugzilla/attachment.cgi?id=12119&action=edit
Testcase
When trying to disassemble an AArch64 binary that contains an opcode of
0x452047a3, objdump will hang forever in this piece of code:
aarch64-dis.c:2843:
case sve_size_tsz_bhs:
i = extract_fields (inst->value, 0, 2, FLD_SVE_sz, FLD_SVE_tszl_19);
while (i != 1)
{
if (i & 1)
return FALSE;
i >>= 1;
variant += 1;
}
break;
Since the value of 'i' is zero, the loop never exits. It looks like other
branches of this switch statement contain checks for (i == 0) prior to entering
the while loop.
Assembling the attached code with 'as' and then trying to disassemble the
resulting object file using 'objdump -d' should reproduce the problem:
% aarch64-linux-gnu-as -march=armv8-a ~/tmp/objdump-hang.s -o
/tmp/objdump-hang.o
% aarch64-linux-gnu-objdump -d /tmp/objdump-hang.o
Found using binutils 2.33.1
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