https://sourceware.org/bugzilla/show_bug.cgi?id=23136
Bug ID: 23136
Summary: [ARM] Branch range check not working properly for
thumb-2 'bl' instruction *
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: andre.simoesdiasvieira at arm dot com
Target Milestone: ---
Hello,
When assembling the following bit of assembly for any Thumb-2 target:
.syntax unified
.thumb
bl sym
.space 0x1ffffff
sym: bx lr
The assembler accepts this and generates a bl with a 'wrapped-around' offset:
Disassembly of section .text:
00000000 <sym-0x2000003>:
0: f7ff ffff bl 2 <sym-0x2000001>
...
02000003 <sym>:
2000003: 4770 bx lr
...
This doesn't seem quite right to me. Note that using 'b.w' instead of 'b',
which has the same –16777216,16777214 offset range, will produce a diagnostic
'branch out of range'.
Regards,
Andre
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