[PATCH] D53444: Support ARM_V4BX relocation
Fangrui Song via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 16 11:27:30 PST 2018
This revision was automatically updated to reflect the committed changes.
Closed by commit rL347077: Support ARM_V4BX relocation (authored by MaskRay, committed by ).
Changed prior to commit:
https://reviews.llvm.org/D53444?vs=174245&id=174415#toc
Repository:
rL LLVM
https://reviews.llvm.org/D53444
Files:
lld/trunk/ELF/Arch/ARM.cpp
lld/trunk/test/ELF/v4bx.yaml
Index: lld/trunk/test/ELF/v4bx.yaml
===================================================================
--- lld/trunk/test/ELF/v4bx.yaml
+++ lld/trunk/test/ELF/v4bx.yaml
@@ -0,0 +1,38 @@
+# REQUIRES: arm
+# RUN: yaml2obj %s -o %t.o
+# RUN: ld.lld %t.o -o %t
+# RUN: llvm-readelf -sections %t | FileCheck %s
+
+# CHECK: .text
+
+--- !ELF
+FileHeader:
+ Class: ELFCLASS32
+ Data: ELFDATA2LSB
+ Type: ET_REL
+ Machine: EM_ARM
+ Flags: [ EF_ARM_EABI_VER5 ]
+Sections:
+ - Name: .text
+ Type: SHT_PROGBITS
+ Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
+ AddressAlign: 0x0000000000000004
+ Content: 1EFF2F01
+ - Name: .rel.text
+ Type: SHT_REL
+ Link: .symtab
+ AddressAlign: 0x0000000000000004
+ Info: .text
+ Relocations:
+ - Offset: 0x0000000000000000
+ Symbol: ''
+ Type: R_ARM_V4BX
+Symbols:
+ Global:
+ - Name: _start
+ Section: .text
+ Local:
+ - Name: .text
+ Type: STT_SECTION
+ Section: .text
+DynamicSymbols:
Index: lld/trunk/ELF/Arch/ARM.cpp
===================================================================
--- lld/trunk/ELF/Arch/ARM.cpp
+++ lld/trunk/ELF/Arch/ARM.cpp
@@ -514,6 +514,12 @@
((Val << 4) & 0x7000) | // imm3
(Val & 0x00ff)); // imm8
break;
+ case R_ARM_V4BX:
+ // V4BX is just a marker to indicate there's a "bx rN" instruction at the
+ // given address. It can be used to implement a special linker mode which
+ // rewrites ARMv4T inputs to ARMv4. Since we support only ARMv4 input and
+ // not ARMv4 output, we can just ignore it.
+ break;
default:
error(getErrorLocation(Loc) + "unrecognized reloc " + Twine(Type));
}
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