similar to: [LLVMdev] ELFObjectFile changes, llvm-objdump showing 'wrong' values?

Hi, I would like to examine the implications you mention in more detail. (1) Symbol address According to the ELF standard, in a symbol table entry st_value means: "In relocatable files, st_value holds a section offset for a defined symbol. That is, st_value is an offset from the beginning of the section that st_shndx identifies." (*) Therefore, when queried about a symbol's

2012/1/23 Bendersky, Eli <eli.bendersky at intel.com>: > Hi, > > I would like to examine the implications you mention in more detail. > Thank you! > (1) Symbol address > According to the ELF standard, in a symbol table entry st_value means: "In relocatable files, st_value holds a section offset for a defined symbol. That is, > st_value is an offset from the

Hi Shankar, On Tue, Feb 12, 2013 at 10:46 PM, Shankar Easwaran <shankare at codeaurora.org> wrote: > Author: shankare > Date: Tue Feb 12 12:46:53 2013 > New Revision: 174990 > > URL: http://llvm.org/viewvc/llvm-project?rev=174990&view=rev [...] > ELFDefinedAtom<ELFT> *createDefinedAtomAndAssignRelocations( > StringRef symbolName, StringRef

While working on some other changes I came across a problem where ELFObjectFile::getSymbolFileOffset was returning a different value than I expected in the case where the symbol in question was a section. Looking at the code, it seems obviously wrong, but I didn't want to just commit my change without at least asking if anyone knew of a good reason for the current behavior. I know there

Hi, I've been trying to write a tool that reads in an ELF file and modifies one section within that ELF file based on the data contained within another section. Using llvm-objdump as a template of how to read an object file, I've been able to read the latter section that tells me what to edit, but I haven't found a way to edit the former, as everything in the

A mutable interface to object files would be great to have but doesn't exist in any meaningful sense in LLVM today. David's hack and similar tricks are what's necessary right now. I'd love to fix that as its a question that comes up not infrequently. Sent from my iPhone > On Aug 25, 2015, at 2:44 AM, David Chisnall via llvm-dev <llvm-dev at lists.llvm.org> wrote: >

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<ELF64LE> *o = dyn_cast<ELFObjectFile<ELF64LE>>(&Binary)) https://github.com/llvm-mirror/llvm/blob/master/tools/llvm-objcopy/llvm-objcopy.cpp#L200

On 10/15/12 12:01, Nick Kledzik wrote: > > On Oct 15, 2012, at 8:08 AM, Sidney Manning wrote: >> >> I think that absolute atoms will need something similar to, "contentType" added. >> >> SHN_ABS symbols can have different types, STT_OBJECT, STT_FILE and maybe others. In order for the writer to tell it must have a way to reach back and ask the atom what type

Hi Nick, The object file already has the information that when its STT_FILE and the symbol name is the name of the translation unit already. I dont think the linker has to add a absolute symbol by figuring out the translation unit. Shankar Easwaran On Mon, Oct 15, 2012 at 6:07 PM, Nick Kledzik <kledzik at apple.com> wrote: > > On Oct 15, 2012, at 4:00 PM, Sid Manning wrote: >

Michael, I have rework the patch according to your suggestion. And I have read binutil/objdump source code and found that it has a logic that if there's no symtab, it will use dynsym, which is missing in llvm-objdump. Songmao -------------- next part -------------- A non-text attachment was scrubbed... Name: 0002-Fix-the-address-calculation-for-llvm-objdump.patch Type: text/x-patch

On Oct 15, 2012, at 4:00 PM, Sid Manning wrote: > On 10/15/12 12:01, Nick Kledzik wrote: >> >> On Oct 15, 2012, at 8:08 AM, Sidney Manning wrote: >>> >>> I think that absolute atoms will need something similar to, "contentType" added. >>> >>> SHN_ABS symbols can have different types, STT_OBJECT, STT_FILE and maybe others. In order

Thanks, Shankar. I needed to override all the places where st_value had been used, and it worked. But there another problem appeared: after correcting all atoms, I cannot distinguish between ARM and Thumb symbols in the further stages when fixing up relocations. I used to check targetVAddress (in terms of the relocation handler) since it contained 1 in the least bit when addressing Thumb

On Wed, Oct 12, 2011 at 3:17 AM, Songmao <smtian at ingenic.cn> wrote: > Michael, >    I have rework the patch according to your suggestion.  And I have read > binutil/objdump source code and found that it has a logic that if there's no > symtab, it will use dynsym, which is missing in llvm-objdump. > > Songmao > @@ -747,12 +747,28 @@ error_code

On Oct 15, 2012, at 9:06 PM, Shankar Kalpathi Easwaran wrote: > The object file already has the information that when its STT_FILE and the symbol name is the name of the translation unit already. > > I dont think the linker has to add a absolute symbol by figuring out the translation unit. Then we are in agreement. Sid started this thread with the suggestion of adding new content

Hello All, In ARM embedded applications, there are some compilers that support useful function and variable attributes that help the compiler communicate information about symbols to downstream object consumers (i.e. linkers). One such attribute is the "location" attribute. This attribute can be applied to a global or local static data object or a function to indicate to the linker

On Oct 15, 2012, at 8:08 AM, Sidney Manning wrote: > > I think that absolute atoms will need something similar to, "contentType" added. > > SHN_ABS symbols can have different types, STT_OBJECT, STT_FILE and maybe others. In order for the writer to tell it must have a way to reach back and ask the atom what type of symbols caused it to be created. To that end I added a

I think that absolute atoms will need something similar to, "contentType" added. SHN_ABS symbols can have different types, STT_OBJECT, STT_FILE and maybe others. In order for the writer to tell it must have a way to reach back and ask the atom what type of symbols caused it to be created. To that end I added a contentType method to AbsoluteAtom and sprinkled changes around to

Hi, The attached patch does a few separate things. I can split them up if you like but it's pretty small. - Adds support for sniffing PE/COFF files on win32 (.exe and .dll) which are COFF files that have an MS-DOS compatibility stub on the front of them. - Fixes a bug in the COFFObjectFile's support for the Microsoft COFF extension for long symbol names, wherein it

Hi Peter, Thanks for the response. If we set aside the discussion of the relationship between sections and the application of the "location" or "at" attribute for a moment, do you have any objections to the proposed method of encoding metadata information about symbols (whether they are associated with actual data objects, functions, or sections) in the ELF object file?

Hi Snider. As you and Peter mentioned there are indeed toolchains that allow location placement from within the C/C++ source code, using attributes or similar. I always wonder if such extension is worth the effort. There are downsides like the non-standard ways of communicating this information to the linker, different places that control location of things (linker and compiler sources). I would