search for: mipselfobjectwriter

...eaders e_flags extensively. The most pressing issue is the need to post the relocation model such as PIC, CPIC or non-shared. The object method that allows me to update the e_flags at the target level, <target>ELFObjectWriter::getEFlags(), had no access to any target specific information . MipsELFObjectWriter is created during MipsAsmBackend construction which is create during an invocation of createMipsAsmBackend(). create<target>AsmBackend is called by: the codegen (integrated assembler) llvm-mc (standalone assembler) clang (cc1as_main.cpp) My solution for getting access of target specif...

On Fri, Dec 14, 2012 at 1:03 PM, Carter, Jack <jcarter at mips.com> wrote: > Eli, > > This is the kind of feedback I want. I believe I have to add to the base class so it should be generally useful. I can see string being better for the value. I still am enamoured with an enumeration for the tab though: int->string. How would that be a limitation? > I guess that's fine,

Older targets like Mips had/have assemblers and ABIs that carry a lot of baggage. The small bit of baggage that is giving me fits is that MipsELFObjectWriter needs to know the relocation model (static,pic,cpic), whether we are using xgot (-mgot), which abi (old,new), which architecture (32r[123],64[123]), which if any coprocessor or extention instructions are used (mips16,micromips,etc.). I shouldn't have to muck with base classes to handle esoteri...

...el_2, ///< A two-byte pc relative fixup. FK_GPRel_4, ///< A four-byte pc relative fixup. FK_GPRel_8, ///< A eight-byte pc relative fixup. In MC/MCStreamer.cpp MCStreamer::EmitGpRel32Value() Figure out how to mark it with the imprint of FK_GPRel_4 In MC/ELFObjectWriter.cpp MipsELFObjectWriter::GetRelocType() Add a switch case for FK_GPRel_4 to put out the correct target specific relocation. Is that correct? Did I miss anything? Thanks, Jack

On 6 December 2012 17:49, Carter, Jack <jcarter at mips.com> wrote: > Older targets like Mips had/have assemblers and ABIs that carry a lot of > baggage. > > The small bit of baggage that is giving me fits is that MipsELFObjectWriter > needs to know the relocation model (static,pic,cpic), whether we are using > xgot (-mgot), which abi (old,new), which architecture (32r[123],64[123]), > which if any coprocessor or extention instructions are used > (mips16,micromips,etc.). So the mips assembler has command line optio...

...ific problem, I suspect what needs to happen is something like: >> >> 1) In MCELFStreamer(), implement EmitGPRel32Value() to add an appropriate fixup, and >> 2) in ELFObjectWriter.cpp, teach the Mips bits what relocation type to use for that fixup, if it doesn't know already. (MipsELFObjectWriter::GetRelocType()). >> >> Regards, >> >> -Jim >> >> On Nov 15, 2011, at 9:57 AM, Carter, Jack wrote: >> >>> Well Jim, that may just  be my problem. >>> >>> As background I am working on the outer reaches of llvm for the direct objec...

...cific bits. For your specific problem, I suspect what needs to happen is something like: 1) In MCELFStreamer(), implement EmitGPRel32Value() to add an appropriate fixup, and 2) in ELFObjectWriter.cpp, teach the Mips bits what relocation type to use for that fixup, if it doesn't know already. (MipsELFObjectWriter::GetRelocType()). Regards, -Jim On Nov 15, 2011, at 9:57 AM, Carter, Jack wrote: > Well Jim, that may just be my problem. > > As background I am working on the outer reaches of llvm for the direct object output for Mips. Part of what I am to do is instruct the folks working closer to...

...ions in the correct order: 1. Add a target hook MCELFObjectTargetWriter::ReorderRelocs. The default behavior sorts the relocations by the r_offset. 2. Move struct ELFRelocationEntry from ELFObjectWriter to MCELFObjectTargetWriter and add member fixup to it. The overridden version of ReorderRelocs (MipsELFObjectWriter::ReorderRelocs) needs access to ELFRelocationEntry::Type and MCFixup::Value to reorder the relocations. Do you think these changes are acceptable? On Wed, Mar 21, 2012 at 3:50 PM, Jim Grosbach <grosbach at apple.com> wrote: > Hi Akira, > > If I follow correctly, the relocation entr...

...cific bits. For your specific problem, I suspect what needs to happen is something like: 1) In MCELFStreamer(), implement EmitGPRel32Value() to add an appropriate fixup, and 2) in ELFObjectWriter.cpp, teach the Mips bits what relocation type to use for that fixup, if it doesn't know already. (MipsELFObjectWriter::GetRelocType()). Regards, -Jim On Nov 15, 2011, at 9:57 AM, Carter, Jack wrote: > Well Jim, that may just be my problem. > > As background I am working on the outer reaches of llvm for the direct object output for Mips. Part of what I am to do is instruct the folks working closer to...

Well Jim, that may just be my problem. As background I am working on the outer reaches of llvm for the direct object output for Mips. Part of what I am to do is instruct the folks working closer to the backend what I am getting that is incorrect. My first reaction is to assume that I am being fed things the correct way and that I am not handling it correctly. I feed the compiler a source file

...r your specific problem, I suspect what needs to happen is something like: > > 1) In MCELFStreamer(), implement EmitGPRel32Value() to add an appropriate fixup, and > 2) in ELFObjectWriter.cpp, teach the Mips bits what relocation type to use for that fixup, if it doesn't know already. (MipsELFObjectWriter::GetRelocType()). > > Regards, > > -Jim > > On Nov 15, 2011, at 9:57 AM, Carter, Jack wrote: > >> Well Jim, that may just be my problem. >> >> As background I am working on the outer reaches of llvm for the direct object output for Mips. Part of what I a...

...t; > 1. Add a target hook MCELFObjectTargetWriter::ReorderRelocs. The > default behavior sorts the relocations by the r_offset. > 2. Move struct ELFRelocationEntry from ELFObjectWriter to > MCELFObjectTargetWriter and add member fixup to it. The overridden > version of ReorderRelocs (MipsELFObjectWriter::ReorderRelocs) needs > access to ELFRelocationEntry::Type and MCFixup::Value to reorder the > relocations. > > Do you think these changes are acceptable? > > On Wed, Mar 21, 2012 at 3:50 PM, Jim Grosbach <grosbach at apple.com> wrote: >> Hi Akira, >> >> If...

...target hook MCELFObjectTargetWriter::ReorderRelocs. The >> default behavior sorts the relocations by the r_offset. >> 2. Move struct ELFRelocationEntry from ELFObjectWriter to >> MCELFObjectTargetWriter and add member fixup to it. The overridden >> version of ReorderRelocs (MipsELFObjectWriter::ReorderRelocs) needs >> access to ELFRelocationEntry::Type and MCFixup::Value to reorder the >> relocations. >> >> Do you think these changes are acceptable? >> >> On Wed, Mar 21, 2012 at 3:50 PM, Jim Grosbach <grosbach at apple.com> wrote: >>>...

Hi Akira, If I follow correctly, the relocation entries can thus be in a different order than the instructions that they're for? That seems a bit odd, but I suppose there's nothing inherently wrong with that. It's just not something, AFAIK, that llvm has had to deal with before. This should definitely be a target-specific thing, not a general ELFObjectWriter thing, as other targets

What would be the best way to sort relocation entries before they are written out in ELFObjectWriter::WriteRelocationsFragment? According to the Mips ABI documents I have, there are certain restrictions on the order relocations appear in the table (e.g. R_MIPS_HI16 and R_MIPS_GOT16 must be followed immediately by a R_MIPS_LO16). When I enable post RA scheduling, some of the restrictions are

...LFObjectTargetWriter::ReorderRelocs. The >>> default behavior sorts the relocations by the r_offset. >>> 2. Move struct ELFRelocationEntry from ELFObjectWriter to >>> MCELFObjectTargetWriter and add member fixup to it. The overridden >>> version of ReorderRelocs (MipsELFObjectWriter::ReorderRelocs) needs >>> access to ELFRelocationEntry::Type and MCFixup::Value to reorder the >>> relocations. >>> >>> Do you think these changes are acceptable? >>> >>> On Wed, Mar 21, 2012 at 3:50 PM, Jim Grosbach <grosbach at apple.com&gt...

...iter::ReorderRelocs. The >>>> default behavior sorts the relocations by the r_offset. >>>> 2. Move struct ELFRelocationEntry from ELFObjectWriter to >>>> MCELFObjectTargetWriter and add member fixup to it. The overridden >>>> version of ReorderRelocs (MipsELFObjectWriter::ReorderRelocs) needs >>>> access to ELFRelocationEntry::Type and MCFixup::Value to reorder the >>>> relocations. >>>> >>>> Do you think these changes are acceptable? >>>> >>>> On Wed, Mar 21, 2012 at 3:50 PM, Jim Grosbach &l...

...tting target specific information to <target>ELFObjectWriter On 6 December 2012 17:49, Carter, Jack <jcarter at mips.com> wrote: > Older targets like Mips had/have assemblers and ABIs that carry a lot of > baggage. > > The small bit of baggage that is giving me fits is that MipsELFObjectWriter > needs to know the relocation model (static,pic,cpic), whether we are using > xgot (-mgot), which abi (old,new), which architecture (32r[123],64[123]), > which if any coprocessor or extention instructions are used > (mips16,micromips,etc.). So the mips assembler has command line optio...