[PATCH] D58655: lld: add support for aarch64be -m flags

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers created this revision.
nickdesaulniers added reviewers: psmith, ruiu, grimar.
Herald added subscribers: llvm-commits, kristof.beyls, arichardson, javed.absar, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

The Linux kernel makes use of -maarch64elfb and -maarch64linuxb.
Link: https://github.com/ClangBuiltLinux/linux/issues/380


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D58655

Files:
  lld/ELF/Driver.cpp
  lld/test/ELF/emulation-aarch64.s


Index: lld/test/ELF/emulation-aarch64.s
===================================================================
--- lld/test/ELF/emulation-aarch64.s
+++ lld/test/ELF/emulation-aarch64.s
@@ -53,5 +53,27 @@
 # AARCH64-FBSD-NEXT:   Flags [ (0x0)
 # AARCH64-FBSD-NEXT:   ]
 
+# RUN: llvm-mc -filetype=obj -triple=aarch64_be-unknown-linux %s -o %t5
+# RUN: ld.lld -maarch64elfb %t5 -o %t5
+# RUN: llvm-readobj -file-headers %t5 | FileCheck --check-prefix=AARCH64BE %s
+# AARCH64BE: ElfHeader {
+# AARCH64BE-NEXT:  Ident {
+# AARCH64BE-NEXT:    Magic: (7F 45 4C 46)
+# AARCH64BE-NEXT:    Class: 64-bit (0x2)
+# AARCH64BE-NEXT:    DataEncoding: BigEndian (0x2)
+# AARCH64BE-NEXT:    FileVersion: 1
+# AARCH64BE-NEXT:    OS/ABI: SystemV (0x0)
+# AARCH64BE-NEXT:    ABIVersion: 0
+# AARCH64BE-NEXT:    Unused: (00 00 00 00 00 00 00)
+# AARCH64BE-NEXT:  }
+# AARCH64BE-NEXT:  Type: Executable (0x2)
+# AARCH64BE-NEXT:  Machine: EM_AARCH64 (0xB7)
+# AARCH64BE-NEXT:  Version: 1
+# AARCH64BE-NEXT:  Entry: 0x210000
+# AARCH64BE-NEXT:  ProgramHeaderOffset: 0x40
+# AARCH64BE-NEXT:  SectionHeaderOffset: 0x10070
+# AARCH64BE-NEXT:  Flags [ (0x0)
+# AARCH64BE-NEXT:  ]
+
 .globl _start
 _start:
Index: lld/ELF/Driver.cpp
===================================================================
--- lld/ELF/Driver.cpp
+++ lld/ELF/Driver.cpp
@@ -124,6 +124,7 @@
       StringSwitch<std::pair<ELFKind, uint16_t>>(S)
           .Cases("aarch64elf", "aarch64linux", "aarch64_elf64_le_vec",
                  {ELF64LEKind, EM_AARCH64})
+          .Cases("aarch64elfb", "aarch64linuxb", {ELF64BEKind, EM_AARCH64})
           .Cases("armelf", "armelf_linux_eabi", {ELF32LEKind, EM_ARM})
           .Case("elf32_x86_64", {ELF32LEKind, EM_X86_64})
           .Cases("elf32btsmip", "elf32btsmipn32", {ELF32BEKind, EM_MIPS})


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