[PATCH] D53444: Support ARM_V4BX relocation
Yin Ma via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Nov 1 11:20:41 PDT 2018
yinma updated this revision to Diff 172187.
https://reviews.llvm.org/D53444
Files:
ELF/Arch/ARM.cpp
test/ELF/Inputs/v4bx.yaml
test/ELF/v4bx.s
Index: test/ELF/v4bx.s
===================================================================
--- /dev/null
+++ test/ELF/v4bx.s
@@ -0,0 +1,9 @@
+// REQUIRES: arm
+// RUN: yaml2obj %p/Inputs/v4bx.yaml -o %tv4bx.o
+// RUN: llvm-mc -filetype=obj -triple=arm-arm-none-eabi %s -o %t.o
+// RUN: ld.lld %t.o %tv4bx.o -o %t.out
+// RUN: llvm-readelf -e %t.out | FileCheck %s
+.global _start
+_start:
+
+// CHECK: .text
Index: test/ELF/Inputs/v4bx.yaml
===================================================================
--- /dev/null
+++ test/ELF/Inputs/v4bx.yaml
@@ -0,0 +1,29 @@
+--- !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:
+ Local:
+ - Name: .text
+ Type: STT_SECTION
+ Section: .text
+DynamicSymbols:
+...
Index: ELF/Arch/ARM.cpp
===================================================================
--- ELF/Arch/ARM.cpp
+++ ELF/Arch/ARM.cpp
@@ -516,6 +516,12 @@
((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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