[lldb] Fix ppc64 detection in lldb

Currently, ppc64le and ppc64 (defaulting to big endian) have the same
descriptor, thus the linear scan always return ppc64le. Handle that through
subtype.

Differential Revision: https://reviews.llvm.org/D124760

lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp

@@ -310,9 +310,19 @@ static uint32_t riscvVariantFromElfFlags(const elf::ELFHeader &header) {
   }
 }
 
+static uint32_t ppc64VariantFromElfFlags(const elf::ELFHeader &header) {
+  uint32_t endian = header.e_ident[EI_DATA];
+  if (endian == ELFDATA2LSB)
+    return ArchSpec::eCore_ppc64le_generic;
+  else
+    return ArchSpec::eCore_ppc64_generic;
+}
+
 static uint32_t subTypeFromElfHeader(const elf::ELFHeader &header) {
   if (header.e_machine == llvm::ELF::EM_MIPS)
     return mipsVariantFromElfFlags(header);
+  else if (header.e_machine == llvm::ELF::EM_PPC64)
+    return ppc64VariantFromElfFlags(header);
   else if (header.e_machine == llvm::ELF::EM_RISCV)
     return riscvVariantFromElfFlags(header);
 

lldb/source/Utility/ArchSpec.cpp

@@ -358,10 +358,10 @@ static const ArchDefinitionEntry g_elf_arch_entries[] = {
      0xFFFFFFFFu, 0xFFFFFFFFu}, // Intel MCU // FIXME: is this correct?
     {ArchSpec::eCore_ppc_generic, llvm::ELF::EM_PPC, LLDB_INVALID_CPUTYPE,
      0xFFFFFFFFu, 0xFFFFFFFFu}, // PowerPC
-    {ArchSpec::eCore_ppc64le_generic, llvm::ELF::EM_PPC64, LLDB_INVALID_CPUTYPE,
-     0xFFFFFFFFu, 0xFFFFFFFFu}, // PowerPC64le
-    {ArchSpec::eCore_ppc64_generic, llvm::ELF::EM_PPC64, LLDB_INVALID_CPUTYPE,
-     0xFFFFFFFFu, 0xFFFFFFFFu}, // PowerPC64
+    {ArchSpec::eCore_ppc64le_generic, llvm::ELF::EM_PPC64,
+     ArchSpec::eCore_ppc64le_generic, 0xFFFFFFFFu, 0xFFFFFFFFu}, // PowerPC64le
+    {ArchSpec::eCore_ppc64_generic, llvm::ELF::EM_PPC64,
+     ArchSpec::eCore_ppc64_generic, 0xFFFFFFFFu, 0xFFFFFFFFu}, // PowerPC64
     {ArchSpec::eCore_arm_generic, llvm::ELF::EM_ARM, LLDB_INVALID_CPUTYPE,
      0xFFFFFFFFu, 0xFFFFFFFFu}, // ARM
     {ArchSpec::eCore_arm_aarch64, llvm::ELF::EM_AARCH64, LLDB_INVALID_CPUTYPE,
@@ -400,8 +400,8 @@ static const ArchDefinitionEntry g_elf_arch_entries[] = {
      LLDB_INVALID_CPUTYPE, 0xFFFFFFFFu, 0xFFFFFFFFu}, // HEXAGON
     {ArchSpec::eCore_arc, llvm::ELF::EM_ARC_COMPACT2, LLDB_INVALID_CPUTYPE,
      0xFFFFFFFFu, 0xFFFFFFFFu}, // ARC
-    {ArchSpec::eCore_avr, llvm::ELF::EM_AVR, LLDB_INVALID_CPUTYPE,
-     0xFFFFFFFFu, 0xFFFFFFFFu}, // AVR
+    {ArchSpec::eCore_avr, llvm::ELF::EM_AVR, LLDB_INVALID_CPUTYPE, 0xFFFFFFFFu,
+     0xFFFFFFFFu}, // AVR
     {ArchSpec::eCore_riscv32, llvm::ELF::EM_RISCV,
      ArchSpec::eRISCVSubType_riscv32, 0xFFFFFFFFu, 0xFFFFFFFFu}, // riscv32
     {ArchSpec::eCore_riscv64, llvm::ELF::EM_RISCV,

lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py

@@ -24,12 +24,14 @@ class LinuxCoreTestCase(TestBase):
     _i386_pid = 32306
     _x86_64_pid = 32259
     _s390x_pid = 1045
+    _ppc64_pid = 28146
     _ppc64le_pid = 28147
 
     _aarch64_regions = 4
     _i386_regions = 4
     _x86_64_regions = 5
     _s390x_regions = 2
+    _ppc64_regions = 2
     _ppc64le_regions = 2
 
     @skipIfLLVMTargetMissing("AArch64")
@@ -49,6 +51,12 @@ class LinuxCoreTestCase(TestBase):
         self.do_test("linux-ppc64le", self._ppc64le_pid, self._ppc64le_regions,
                      "linux-ppc64le.ou")
 
+    @skipIfLLVMTargetMissing("PowerPC")
+    def test_ppc64(self):
+        """Test that lldb can read the process information from an ppc64 linux core file."""
+        self.do_test("linux-ppc64", self._ppc64_pid, self._ppc64_regions,
+                     "linux-ppc64.ou")
+
     @skipIfLLVMTargetMissing("X86")
     def test_x86_64(self):
         """Test that lldb can read the process information from an x86_64 linux core file."""