https://sourceware.org/bugzilla/show_bug.cgi?id=25108
Bug ID: 25108
Summary: gas will not assemble legal thumb-1 ADR if
-march=armv4t is thrown
Product: binutils
Version: 2.33
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: rcwhaley at iu dot edu
Target Milestone: ---
I believe that this is due to an improper patch for this bug report:
https://lists.gnu.org/archive/html/bug-binutils/2015-06/msg00074.html
Basically, if you tell gas to give you the original thumb-1 ISA using -thumb
-march=armv4t, it will refuse to assemble an ADR instruction using the
preferred label form. For instance, this code will assemble without specifying
armv4t, but will die with it:
****
.text
.thumb
.syntax unified
.globl mrgSort
mrgSort:
adr r0, mrgSort
bx lr
******
Note that the above instruction is valid for all thumb ISAs according to the
ARM documentation, but gas refuses to assemble it unless you specify armv7,
which lets in a huge number of instructions that are incompatible with thumb-1.
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