[mips] Deduce MIPS specific ELF header flags from `emulation`
In case of linking binary blobs which do not have any ELF headers, we can
deduce MIPS ABI ELF header flags from an `emulation` option.
Patch by Kyle Evans.
git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@372513 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/ELF/Arch/MipsArchTree.cpp b/ELF/Arch/MipsArchTree.cpp
index f745a87..5de85e2 100644
--- a/ELF/Arch/MipsArchTree.cpp
+++ b/ELF/Arch/MipsArchTree.cpp
@@ -294,12 +294,30 @@
return ret;
}
+// If we don't have any input files, we'll have to rely on the information we
+// can derive from emulation information, since this at least gets us ABI.
+static uint32_t getFlagsFromEmulation() {
+ uint32_t ret = 0;
+
+ if (config->emulation.empty())
+ return 0;
+
+ if (config->ekind == ELF32BEKind || config->ekind == ELF32LEKind) {
+ if (config->mipsN32Abi)
+ ret |= EF_MIPS_ABI2;
+ else
+ ret |= EF_MIPS_ABI_O32;
+ }
+
+ return ret;
+}
+
template <class ELFT> uint32_t elf::calcMipsEFlags() {
std::vector<FileFlags> v;
for (InputFile *f : objectFiles)
v.push_back({f, cast<ObjFile<ELFT>>(f)->getObj().getHeader()->e_flags});
if (v.empty())
- return 0;
+ return getFlagsFromEmulation();
checkFlags(v);
return getMiscFlags(v) | getPicFlags(v) | getArchFlags(v);
}
diff --git a/test/ELF/mips-elf-flags-binary.s b/test/ELF/mips-elf-flags-binary.s
new file mode 100644
index 0000000..3278fa0
--- /dev/null
+++ b/test/ELF/mips-elf-flags-binary.s
@@ -0,0 +1,25 @@
+# REQUIRES: mips
+# Check deducing MIPS specific ELF header flags from `emulation`.
+
+# RUN: echo -n "BLOB" > %t.binary
+# RUN: ld.lld -m elf32btsmip -r -b binary %t.binary -o %t.out
+# RUN: llvm-readobj -h %t.out | FileCheck -check-prefix=O32 %s
+
+# RUN: echo -n "BLOB" > %t.binary
+# RUN: ld.lld -m elf32btsmipn32 -r -b binary %t.binary -o %t.out
+# RUN: llvm-readobj -h %t.out | FileCheck -check-prefix=N32 %s
+
+# RUN: echo -n "BLOB" > %t.binary
+# RUN: ld.lld -m elf64btsmip -r -b binary %t.binary -o %t.out
+# RUN: llvm-readobj -h %t.out | FileCheck -check-prefix=N64 %s
+
+# O32: Flags [
+# O32-NEXT: EF_MIPS_ABI_O32
+# O32-NEXT: ]
+
+# N32: Flags [
+# N32-NEXT: EF_MIPS_ABI2
+# N32-NEXT: ]
+
+# N64: Flags [
+# N64-NEXT: ]
