[llvm-objcopy] Add support for --only-keep/-j and --keep
This change adds support for the --only-keep option and the -j alias as well.
A common use case for these being used together is to dump a specific section's
data. Additionally the --keep option is added (GNU objcopy doesn't have this)
to avoid removing a bunch of things. This allows people to err on the side of
stripping aggressively and then to keep the specific bits that they need for
their application.
Differential Revision: https://reviews.llvm.org/D39021
llvm-svn: 319467
diff --git a/llvm/test/tools/llvm-objcopy/dump-section.test b/llvm/test/tools/llvm-objcopy/dump-section.test
new file mode 100644
index 0000000..123f473
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/dump-section.test
@@ -0,0 +1,28 @@
+# RUN: yaml2obj %s > %t
+# RUN: llvm-objcopy -O binary -j .text %t %t2
+# RUN: llvm-objcopy -O binary -only-keep .text %t %t3
+# RUN: od -t x1 %t2 | FileCheck %s
+# RUN: wc -c %t2 | FileCheck %s --check-prefix=SIZE
+# RUN: diff %t2 %t3
+
+!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: "DEADBEEF"
+ProgramHeaders:
+- Type: PT_LOAD
+ Flags: [ PF_X, PF_R ]
+ Sections:
+ - Section: .text
+
+#CHECK: 0000000 de ad be ef
+
+#SIZE: 4