https://sourceware.org/bugzilla/show_bug.cgi?id=18541
Bug ID: 18541
Summary: ARM: adr reference to global symbol fails to assemble
in Thumb mode
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: ard.biesheuvel at linaro dot org
Target Milestone: ---
The following ARM code fails to assemble in Thumb mode
"""
adr r0, cp15_save_power
.align
.globl cp15_save_power
cp15_save_power:
.long 0 @ cp15 power control
"""
$ arm-linux-gnueabihf-as -o /tmp/sleep.o /tmp/sleep.S -mthumb
/tmp/sleep.S: Assembler messages:
/tmp/sleep.S:1: Error: invalid immediate for address calculation
(value = 0x00000004)
The error goes away when I drop the -mthumb or when I replace the code with
"""
adr r0, 0f
.align
.globl cp15_save_power
cp15_save_power:
0: .long 0 @ cp15 power control
"""
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