[llvm-dev] How to objcopy via LLVM toolchain for armv7e-m ELF32LE? (original) (raw)

James Henderson via llvm-dev llvm-dev at lists.llvm.org
Mon Nov 13 06:27:49 PST 2017

Hi,

At the moment, we've only added support for 64-bit Little Endian ELF to llvm-objcopy, but I'm pretty sure most of the code should be able to handle 32-bit ELF as well, with a patch such as the one you've attached. Jake Ehrlich (CC'ed), who is the main developer on llvm-objcopy should be able to give you a more complete answer.

Regards,

James

On 13 November 2017 at 07:00, Leslie Zhai via llvm-dev < llvm-dev at lists.llvm.org> wrote:

Testcase: https://github.com/xiangzhai/mini-arm-os/tree/llvm-toolchain /00-HelloWorld

$ make CC hello.c CC startup.c LD hello.elf READ -> hello.rd LIST -> hello.lst COPY -> hello.bin text data bss dec hex filename 190 14 0 204 cc hello.elf $ make qemu /data/project/qemustm32/arm-softmmu/qemu-system-arm -M stm32-p103 -nographic -kernel hello.bin ... LED Off Hello World!

在 2017年11月13日 14:14, Leslie Zhai 写道: Is it able to just workaround add ELF32LE?

diff --git a/tools/llvm-objcopy/llvm-objcopy.cpp b/tools/llvm-objcopy/llvm-objcopy.cpp index 54186f6..3234c65 100644 --- a/tools/llvm-objcopy/llvm-objcopy.cpp +++ b/tools/llvm-objcopy/llvm-objcopy.cpp @@ -138,18 +138,19 @@ void SplitDWOToFile(const ELFObjectFile &ObjFile, StringRef File) { WriteObjectFile(DWOFile, File); } -void CopyBinary(const ELFObjectFile &ObjFile) { - std::uniqueptr<Object> Obj; +template +void CopyBinary(const ELFObjectFile &ObjFile) { + std::uniqueptr<Object> Obj; if (!OutputFormat.empty() && OutputFormat != "binary") error("invalid output format '" + OutputFormat + "'"); if (!OutputFormat.empty() && OutputFormat == "binary") - Obj = llvm::makeunique<BinaryObject>(ObjFile); + Obj = llvm::makeunique<BinaryObject>(ObjFile); else - Obj = llvm::makeunique<ELFObject>(ObjFile); + Obj = llvm::makeunique<ELFObject>(ObjFile); if (!SplitDWO.empty()) - SplitDWOToFile(ObjFile, SplitDWO.getValue()); + SplitDWOToFile(ObjFile, SplitDWO.getValue()); SectionPred RemovePred = [](const SectionBase &) { return false; }; @@ -200,6 +201,9 @@ int main(int argc, char **argv) { if (ELFObjectFile *o = dyncast<ELFObjectFile>(&Binary)) { CopyBinary(*o); return 0; + } else if (ELFObjectFile *o = dyncast<ELFObjectFile>(&Binary)) { + CopyBinary(*o); + return 0; } reportError(InputFilename, objecterror::invalidfiletype); }

在 2017年11月13日 11:32, Leslie Zhai 写道: Hi LLVM developers, As PR35281 mentioned: $ llvm-objcopy -O binary llvm-cortex-m7.elf llvm-cortex-m7.bin llvm-objcopy: 'llvm-cortex-m7.elf': The file was not recognized as a valid object file.

if (ELFObjectFile *o = dyncast<ELFObjectFile>(&Binary)) https://github.com/llvm-mirror/llvm/blob/master/tools/llvm- objcopy/llvm-objcopy.cpp#L200 Please give me some hints about objcopy armv7e-m ELF32LE via LLVM toolchain, thanks a lot! -- Regards, Leslie Zhai - https://reviews.llvm.org/p/xiangzhai/

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