Recover elf32-bigmips and elf32-powerpc support in LLD

This fixes a 7.0 -> 8.0 regression when parsing
OUTPUT_FORMAT("elf32-powerpc"); or elf32-bigmips directive in ldscripts
as well as an unknown emulation error when lld is invoked by clang due
to missed elf32ppclinux case.

Patch by vit9696

Differential Revision: https://reviews.llvm.org/D58005

llvm-svn: 353968

lld/ELF/Driver.cpp

@@ -129,7 +129,7 @@ static std::tuple<ELFKind, uint16_t, uint8_t> parseEmulation(StringRef Emul) {
           .Cases("elf32btsmip", "elf32btsmipn32", {ELF32BEKind, EM_MIPS})
           .Cases("elf32ltsmip", "elf32ltsmipn32", {ELF32LEKind, EM_MIPS})
           .Case("elf32lriscv", {ELF32LEKind, EM_RISCV})
-          .Case("elf32ppc", {ELF32BEKind, EM_PPC})
+          .Cases("elf32ppc", "elf32ppclinux", {ELF32BEKind, EM_PPC})
           .Case("elf64btsmip", {ELF64BEKind, EM_MIPS})
           .Case("elf64ltsmip", {ELF64LEKind, EM_MIPS})
           .Case("elf64lriscv", {ELF64LEKind, EM_RISCV})

lld/ELF/ScriptParser.cpp

@@ -391,10 +391,11 @@ static std::pair<ELFKind, uint16_t> parseBfdName(StringRef S) {
       .Case("elf32-x86-64", {ELF32LEKind, EM_X86_64})
       .Case("elf64-aarch64", {ELF64LEKind, EM_AARCH64})
       .Case("elf64-littleaarch64", {ELF64LEKind, EM_AARCH64})
+      .Case("elf32-powerpc", {ELF32BEKind, EM_PPC})
       .Case("elf64-powerpc", {ELF64BEKind, EM_PPC64})
       .Case("elf64-powerpcle", {ELF64LEKind, EM_PPC64})
       .Case("elf64-x86-64", {ELF64LEKind, EM_X86_64})
-      .Case("elf32-tradbigmips", {ELF32BEKind, EM_MIPS})
+      .Cases("elf32-tradbigmips", "elf32-bigmips", {ELF32BEKind, EM_MIPS})
       .Case("elf32-ntradbigmips", {ELF32BEKind, EM_MIPS})
       .Case("elf32-tradlittlemips", {ELF32LEKind, EM_MIPS})
       .Case("elf32-ntradlittlemips", {ELF32LEKind, EM_MIPS})

lld/test/ELF/emulation-mips.s

@@ -7,6 +7,9 @@
 # RUN: echo 'OUTPUT_FORMAT(elf32-tradbigmips)' > %tmips.script
 # RUN: ld.lld %tmips.script -e _start %tmips -o %t4mips
 # RUN: llvm-readobj -file-headers %t4mips | FileCheck --check-prefix=MIPS %s
+# RUN: echo 'OUTPUT_FORMAT(elf32-bigmips)' > %tmips2.script
+# RUN: ld.lld %tmips2.script -e _start %tmips -o %t5mips
+# RUN: llvm-readobj -file-headers %t5mips | FileCheck --check-prefix=MIPS %s
 # MIPS:      ElfHeader {
 # MIPS-NEXT:   Ident {
 # MIPS-NEXT:     Magic: (7F 45 4C 46)

lld/test/ELF/emulation-ppc.s

@@ -103,5 +103,42 @@
 # PPC64LE-NEXT:   StringTableSectionIndex:
 # PPC64LE-NEXT: }
 
+# RUN: llvm-mc -filetype=obj -triple=powerpc-unknown-linux %s -o %tppc32
+# RUN: ld.lld -m elf32ppc %tppc32 -o %t2ppc32
+# RUN: llvm-readobj -file-headers %t2ppc32 | FileCheck --check-prefix=PPC32 %s
+# RUN: ld.lld %tppc32 -o %t3ppc32
+# RUN: llvm-readobj -file-headers %t3ppc32 | FileCheck --check-prefix=PPC32 %s
+# RUN: echo 'OUTPUT_FORMAT(elf32-powerpc)' > %tppc32.script
+# RUN: ld.lld %tppc32.script  %tppc32 -o %t4ppc32
+# RUN: llvm-readobj -file-headers %t4ppc32 | FileCheck --check-prefix=PPC32 %s
+# RUN: ld.lld -m elf32ppclinux %tppc32 -o %t5ppc32
+# RUN: llvm-readobj -file-headers %t5ppc32 | FileCheck --check-prefix=PPC32 %s
+
+# PPC32:      ElfHeader {
+# PPC32-NEXT:   Ident {
+# PPC32-NEXT:     Magic: (7F 45 4C 46)
+# PPC32-NEXT:     Class: 32-bit (0x1)
+# PPC32-NEXT:     DataEncoding: BigEndian (0x2)
+# PPC32-NEXT:     FileVersion: 1
+# PPC32-NEXT:     OS/ABI: SystemV (0x0)
+# PPC32-NEXT:     ABIVersion: 0
+# PPC32-NEXT:     Unused: (00 00 00 00 00 00 00)
+# PPC32-NEXT:   }
+# PPC32-NEXT:   Type: Executable (0x2)
+# PPC32-NEXT:   Machine: EM_PPC (0x14)
+# PPC32-NEXT:   Version: 1
+# PPC32-NEXT:   Entry:
+# PPC32-NEXT:   ProgramHeaderOffset: 0x34
+# PPC32-NEXT:   SectionHeaderOffset:
+# PPC32-NEXT:   Flags [ (0x0)
+# PPC32-NEXT:   ]
+# PPC32-NEXT:   HeaderSize: 52
+# PPC32-NEXT:   ProgramHeaderEntrySize: 32
+# PPC32-NEXT:   ProgramHeaderCount:
+# PPC32-NEXT:   SectionHeaderEntrySize: 40
+# PPC32-NEXT:   SectionHeaderCount:
+# PPC32-NEXT:   StringTableSectionIndex:
+# PPC32-NEXT: }
+
 .globl _start
 _start: