[lld] r338999 - [ELF] Test undefined weak symbol for Thumb narrow branch
Peter Smith via llvm-commits
llvm-commits at lists.llvm.org
Mon Aug 6 03:06:24 PDT 2018
Author: psmith
Date: Mon Aug 6 03:06:24 2018
New Revision: 338999
URL: http://llvm.org/viewvc/llvm-project?rev=338999&view=rev
Log:
[ELF] Test undefined weak symbol for Thumb narrow branch
Add a test for the R_ARM_THM_JUMP11 relocation to an undefined symbol. We
have to use yaml2obj as llvm-mc relaxes the narrow branch to a b.w which
uses the R_ARM_THM_JUMP24 relocation instead.
Differential Revision: https://reviews.llvm.org/D50234
Added:
lld/trunk/test/ELF/arm-thumb-undefined-weak-narrow.test
Added: lld/trunk/test/ELF/arm-thumb-undefined-weak-narrow.test
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/arm-thumb-undefined-weak-narrow.test?rev=338999&view=auto
==============================================================================
--- lld/trunk/test/ELF/arm-thumb-undefined-weak-narrow.test (added)
+++ lld/trunk/test/ELF/arm-thumb-undefined-weak-narrow.test Mon Aug 6 03:06:24 2018
@@ -0,0 +1,50 @@
+# REQUIRES: arm
+# RUN: yaml2obj %s -o %t.o
+# RUN: ld.lld %t.o -o %t
+# RUN: llvm-objdump -triple=thumbv7a-linux-gnueabi -d %t | FileCheck %s
+
+# CHECK: Disassembly of section .text:
+# CHECK-NEXT:_start:
+# CHECK-NEXT: 11000: ff e7 b #-2
+
+# Test the R_ARM_THM_JUMP11 relocation (102) to an undefined weak reference
+# It should resolve to the next instruction, which is an offset of -2 which
+# when added to the Thumb PC-bias of 4 is +2. We can't use llvm-mc to construct
+# the object as it relaxes b.n to b.w (R_ARM_JUMP24).
+
+!ELF
+FileHeader:
+ Class: ELFCLASS32
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_ARM
+Sections:
+ - Type: SHT_PROGBITS
+ Name: .text
+ Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
+ Content: "fee7"
+ - Type: SHT_REL
+ Name: .rel.text
+ Link: .symtab
+ Info: .text
+ Relocations:
+ - Offset: 0
+ Symbol: undefined_weak
+ Type: R_ARM_THM_JUMP11
+
+Symbols:
+ Global:
+ - Type: STT_FUNC
+ Name: _start
+ Value: 1
+ Section: .text
+ Local:
+ - Type: STT_NOTYPE
+ Name: "$t"
+ Section: .text
+ Value: 0
+ Weak:
+ - Type: STT_NOTYPE
+ Name: undefined_weak
+ Value: 0
+
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