6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-21 18:24:23 +00:00
Code Issues Projects Releases Wiki Activity

[PowerPC] ELFv2 dynamic loader support

Browse Source 
This patch enables the new ELFv2 ABI in the runtime dynamic loader.
The loader has to implement the following features:
- In the ELFv2 ABI, do not look up a function descriptor in .opd, but
  instead use the local entry point when resolving a direct call.
- Update the TOC restore code to use the new TOC slot linkage area
  offset.
- Create PLT stubs appropriate for the ELFv2 ABI.

Note that this patch also adds common-code changes. These are necessary
because the loader must check the newly added ELF flags: the e_flags
header bits encoding the ABI version, and the st_other symbol table
entry bits encoding the local entry point offset.  There is currently
no way to access these, so I've added ObjectFile::getPlatformFlags and
SymbolRef::getOther accessors.

Reviewed by Hal Finkel.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213491 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ulrich Weigand
2014-07-20 23:53:14 +00:00
parent 7fc5011e8d
commit 68b292b026
5 changed files with 75 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
include/llvm/Object/ELFObjectFile.h
View File

@ -65,6 +65,7 @@ protected:
uint32_t &Res) const override;
std::error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const override;
uint32_t getSymbolFlags(DataRefImpl Symb) const override;
std::error_code getSymbolOther(DataRefImpl Symb, uint8_t &Res) const override;
std::error_code getSymbolType(DataRefImpl Symb,
SymbolRef::Type &Res) const override;
std::error_code getSymbolSection(DataRefImpl Symb,
@ -202,6 +203,11 @@ public:
unsigned getArch() const override;
StringRef getLoadName() const override;
std::error_code getPlatformFlags(unsigned &Result) const override {
Result = EF.getHeader()->e_flags;
return object_error::success;
}
const ELFFile<ELFT> *getELFFile() const { return &EF; }
bool isDyldType() const { return isDyldELFObject; }
@ -294,6 +300,13 @@ std::error_code ELFObjectFile<ELFT>::getSymbolSize(DataRefImpl Symb,
return object_error::success;
}
template <class ELFT>
std::error_code ELFObjectFile<ELFT>::getSymbolOther(DataRefImpl Symb,
uint8_t &Result) const {
Result = toELFSymIter(Symb)->st_other;
return object_error::success;
}
template <class ELFT>
std::error_code
ELFObjectFile<ELFT>::getSymbolType(DataRefImpl Symb,