Reland "[LLVM][llvm-objcopy] Added basic plumbing to get things started"

As discussed on llvm-dev I've implemented the first basic steps towards
llvm-objcopy/llvm-objtool (name pending).

This change adds the ability to copy (without modification) 64-bit
little endian ELF executables that have SHT_PROGBITS, SHT_NOBITS,
SHT_NULL and SHT_STRTAB sections.

Patch by Jake Ehrlich

Differential Revision: https://reviews.llvm.org/D33964

llvm-svn: 309249

4 files changed, 171 insertions, 0 deletions

diff --git a/llvm/test/CMakeLists.txt b/llvm/test/CMakeLists.txt
index 3b826bb3230..0233cba61f1 100644
--- a/llvm/test/CMakeLists.txt
+++ b/llvm/test/CMakeLists.txt
@@ -61,6 +61,7 @@ set(LLVM_TEST_DEPENDS
           llvm-modextract
           llvm-mt
           llvm-nm
+          llvm-objcopy
           llvm-objdump
           llvm-opt-report
           llvm-pdbutil
diff --git a/llvm/test/tools/llvm-objcopy/basic-copy.test b/llvm/test/tools/llvm-objcopy/basic-copy.test
new file mode 100644
index 00000000000..266d48b495e
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/basic-copy.test
@@ -0,0 +1,47 @@
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy %t %t2
+# RUN: llvm-readobj -sections %t2 | FileCheck %s
+
+!ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .bss
+    Type:            SHT_NOBITS
+    Flags:           [ SHF_ALLOC ]
+    AddressAlign:    0x0000000000000010
+    Size:            64
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x0000000000000010
+    Content:         "00000000"
+
+# CHECK: Type: SHT_NULL
+
+# CHECK:      Name: .bss
+# CHECK-NEXT: Type: SHT_NOBITS
+# CHECK-NEXT: Flags [
+# CHECK-NEXT:   SHF_ALLOC
+# CHECK-NEXT: ]
+# CHECK-NEXT: Address:
+# CHECK-NEXT: Offset: [[OFFSET:0x[0-9A-F]+]]
+# CHECK-NEXT: Size: 64
+
+# CHECK:      Name: .text
+# CHECK-NEXT: Type: SHT_PROGBITS
+# CHECK-NEXT: Flags [
+# CHECK-NEXT:   SHF_ALLOC
+# CHECK-NEXT:   SHF_EXECINSTR
+# CHECK-NEXT: ]
+# CHECK-NEXT: Address:
+# CHECK-NEXT: Offset: [[OFFSET]]
+# CHECK-NEXT: Size: 4
+
+# CHECK:      Name: .shstrtab
+# CHECK-NEXT: Type: SHT_STRTAB
+# CHECK-NEXT: Flags [
+# CHECK-NEXT: ]
diff --git a/llvm/test/tools/llvm-objcopy/empty-section.test b/llvm/test/tools/llvm-objcopy/empty-section.test
new file mode 100644
index 00000000000..8847327a069
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/empty-section.test
@@ -0,0 +1,55 @@
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy %t %t2
+# RUN: llvm-readobj -sections %t2 | FileCheck %s
+
+!ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Address:         0x0
+    AddressAlign:    0x0000000000001000
+    Content:         "00000000"
+  - Name:            .empty
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC ]
+    Address:         0x1000
+    AddressAlign:    0x0000000000001000
+    Content:         ""
+  - Name:            .data
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC ]
+    Address:         0x1000
+    AddressAlign:    0x0000000000001000
+    Content:         "00000000"
+
+
+# CHECK:      Name: .text
+# CHECK-NEXT: Type: SHT_PROGBITS
+# CHECK-NEXT: Flags [
+# CHECK-NEXT:   SHF_ALLOC
+# CHECK-NEXT:   SHF_EXECINSTR
+# CHECK-NEXT: ]
+
+# CHECK:      Name: .empty
+# CHECK-NEXT: Type: SHT_PROGBITS
+# CHECK-NEXT: Flags [
+# CHECK-NEXT:   SHF_ALLOC
+# CHECK-NEXT: ]
+# CHECK-NEXT: Address: 0x1000
+# CHECK-NEXT: Offset: 0x2000
+# CHECK-NEXT: Size: 0
+
+# CHECK:      Name: .data
+# CHECK-NEXT: Type: SHT_PROGBITS
+# CHECK-NEXT: Flags [
+# CHECK-NEXT:   SHF_ALLOC
+# CHECK-NEXT: ]
+# CHECK-NEXT: Address: 0x1000
+# CHECK-NEXT: Offset: 0x2000
+# CHECK-NEXT: Size: 4
diff --git a/llvm/test/tools/llvm-objcopy/program-headers.test b/llvm/test/tools/llvm-objcopy/program-headers.test
new file mode 100644
index 00000000000..5c34839bb43
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/program-headers.test
@@ -0,0 +1,68 @@
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-objcopy %t %t2
+# RUN: llvm-readobj -program-headers %t2 | FileCheck %s
+
+!ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_X86_64
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x0000000000001000
+    Content:         "00000000"
+  - Name:            .init
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    Content:         "00000000"
+    AddressAlign:    0x0000000000000010
+  - Name:            .data
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC ]
+    Content:         "00000000"
+    AddressAlign:    0x0000000000001000
+ProgramHeaders:
+  - Type: PT_LOAD
+    Flags: [ PF_X, PF_R ]
+    VAddr: 0xAAAA1000
+    PAddr: 0xFFFF1000
+    Sections:
+      - Section: .text
+      - Section: .init
+  - Type: PT_LOAD
+    Flags: [ PF_R ]
+    VAddr: 0xAAAA2000
+    PAddr: 0xFFFF2000
+    Sections:
+      - Section: .data
+
+#CHECK:     ProgramHeaders [
+#CHECK-NEXT:   ProgramHeader {
+#CHECK-NEXT:    Type: PT_LOAD
+#CHECK-NEXT:    Offset: 0x1000
+#CHECK-NEXT:    VirtualAddress: 0xAAAA1000
+#CHECK-NEXT:    PhysicalAddress: 0xFFFF1000
+#CHECK-NEXT:    FileSize: 20
+#CHECK-NEXT:    MemSize: 20
+#CHECK-NEXT:    Flags [
+#CHECK-NEXT:      PF_R
+#CHECK-NEXT:      PF_X
+#CHECK-NEXT:    ]
+#CHECK-NEXT:    Alignment: 4096
+#CHECK-NEXT:  }
+#CHECK-NEXT:  ProgramHeader {
+#CHECK-NEXT:    Type: PT_LOAD
+#CHECK-NEXT:    Offset: 0x2000
+#CHECK-NEXT:    VirtualAddress: 0xAAAA2000
+#CHECK-NEXT:    PhysicalAddress: 0xFFFF2000
+#CHECK-NEXT:    FileSize: 4
+#CHECK-NEXT:    MemSize: 4
+#CHECK-NEXT:    Flags [
+#CHECK-NEXT:      PF_R
+#CHECK-NEXT:    ]
+#CHECK-NEXT:    Alignment: 4096
+#CHECK-NEXT:  }
+#CHECK-NEXT:]