[llvm-objcopy] Add --gap-fill and --pad-to options (#65815)

`--gap-fill <value>` fills the gaps between sections with a specified
8-bit value, instead of zero.
`--pad-to <address>` pads the output binary up to the specified load
address, using the 8-bit value from `--gap-fill` or zero.

These options are only supported for ELF input and binary output.

1 files changed, 29 insertions, 0 deletions

diff --git a/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp b/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp
index efc09f3..f15307181 100644
--- a/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp
+++ b/llvm/tools/llvm-objcopy/ObjcopyOptions.cpp
@@ -737,6 +737,35 @@ objcopy::parseObjcopyOptions(ArrayRef<const char *> RawArgsArr,
   if (auto Arg = InputArgs.getLastArg(OBJCOPY_extract_partition))
     Config.ExtractPartition = Arg->getValue();
 
+  if (const auto *A = InputArgs.getLastArg(OBJCOPY_gap_fill)) {
+    if (Config.OutputFormat != FileFormat::Binary)
+      return createStringError(
+          errc::invalid_argument,
+          "'--gap-fill' is only supported for binary output");
+    ErrorOr<uint64_t> Val = getAsInteger<uint64_t>(A->getValue());
+    if (!Val)
+      return createStringError(Val.getError(), "--gap-fill: bad number: %s",
+                               A->getValue());
+    uint8_t ByteVal = Val.get();
+    if (ByteVal != Val.get())
+      return createStringError(std::errc::value_too_large,
+                               "gap-fill value %s is out of range (0 to 0xff)",
+                               A->getValue());
+    Config.GapFill = ByteVal;
+  }
+
+  if (const auto *A = InputArgs.getLastArg(OBJCOPY_pad_to)) {
+    if (Config.OutputFormat != FileFormat::Binary)
+      return createStringError(
+          errc::invalid_argument,
+          "'--pad-to' is only supported for binary output");
+    ErrorOr<uint64_t> Addr = getAsInteger<uint64_t>(A->getValue());
+    if (!Addr)
+      return createStringError(Addr.getError(), "--pad-to: bad number: %s",
+                               A->getValue());
+    Config.PadTo = *Addr;
+  }
+
   for (auto *Arg : InputArgs.filtered(OBJCOPY_redefine_symbol)) {
     if (!StringRef(Arg->getValue()).contains('='))
       return createStringError(errc::invalid_argument,