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[LLDB][MIPS] Add support for DT_MIPS_RLD_MAP_REL

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SUMMARY:
    This patch provides support for MIPS specific DT_MIPS_RLD_MAP_REL tag in LLDB.
    This tag allows debugging of MIPS position independent executables and provides access to shared library information.

    Reviewers: clayborg
    Subscribers: mohit.bhakkad, sagar, jaydeep, lldb-commits
    Differential Revision: http://reviews.llvm.org/D12794

llvm-svn: 247666
This commit is contained in:
Bhushan D. Attarde
2015-09-15 05:45:29 +00:00
parent d089060d87
commit 1bcc7bac8f
1 changed files with 23 additions and 4 deletions
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27
lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
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@@ -1097,16 +1097,35 @@ ObjectFileELF::GetImageInfoAddress(Target *target)
addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize();
return Address(dynsym_section_sp, offset);
}
else if (symbol.d_tag == DT_MIPS_RLD_MAP && target)
// MIPS executables uses DT_MIPS_RLD_MAP_REL to support PIE. DT_MIPS_RLD_MAP exists in non-PIE.
else if ((symbol.d_tag == DT_MIPS_RLD_MAP || symbol.d_tag == DT_MIPS_RLD_MAP_REL) && target)
{
addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize();
addr_t dyn_base = dynsym_section_sp->GetLoadBaseAddress(target);
if (dyn_base == LLDB_INVALID_ADDRESS)
return Address();
Address addr;
Error error;
if (target->ReadPointerFromMemory(dyn_base + offset, false, error, addr))
return addr;
if (symbol.d_tag == DT_MIPS_RLD_MAP)
{
// DT_MIPS_RLD_MAP tag stores an absolute address of the debug pointer.
Address addr;
if (target->ReadPointerFromMemory(dyn_base + offset, false, error, addr))
return addr;
}
if (symbol.d_tag == DT_MIPS_RLD_MAP_REL)
{
// DT_MIPS_RLD_MAP_REL tag stores the offset to the debug pointer, relative to the address of the tag.
uint64_t rel_offset;
rel_offset = target->ReadUnsignedIntegerFromMemory(dyn_base + offset, false, GetAddressByteSize(), UINT64_MAX, error);
if (error.Success() && rel_offset != UINT64_MAX)
{
Address addr;
addr_t debug_ptr_address = dyn_base + (offset - GetAddressByteSize()) + rel_offset;
addr.SetOffset (debug_ptr_address);
return addr;
}
}
}
}