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[Gnu] Support --image-base option 

The value for --image-base is used as the base address of the program.

llvm-svn: 221589
This commit is contained in:
Shankar Easwaran 2014-11-10 14:55:21 +00:00
parent 7a82510348
commit 7757f1ace6
4 changed files with 111 additions and 0 deletions
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1
lld/include/lld/ReaderWriter/ELFLinkingContext.h
View File

@ -76,6 +76,7 @@ public:
uint16_t getOutputMachine() const;
bool mergeCommonStrings() const { return _mergeCommonStrings; }
virtual uint64_t getBaseAddress() const { return _baseAddress; }
virtual void setBaseAddress(uint64_t address) { _baseAddress = address; }
void notifySymbolTableCoalesce(const Atom *existingAtom, const Atom *newAtom,
bool &useNew) override;

13
lld/lib/Driver/GnuLdDriver.cpp
View File

@ -594,6 +594,19 @@ bool GnuLdDriver::parse(int argc, const char *argv[],
ctx->setAlignSegments(false);
break;
case OPT_image_base: {
ErrorOr<uint64_t> baseAddress =
lld::parseNum(inputArg->getValue(), false);
if (baseAddress && baseAddress.get())
ctx->setBaseAddress(baseAddress.get());
else {
diagnostics << "invalid value for image base " << inputArg->getValue()
<< "\n";
return false;
}
break;
}
default:
break;
} // end switch on option ID

3
lld/lib/Driver/GnuLdOptions.td
View File

@ -106,6 +106,9 @@ def no_whole_archive: Flag<["--"], "no-whole-archive">,
def nostdlib : Flag<["-"], "nostdlib">,
HelpText<"Disable default search path for libraries">,
Group<grp_main>;
def image_base : Separate<["--"], "image-base">,
HelpText<"Set the base address">,
Group<grp_main>;
//===----------------------------------------------------------------------===//
/// Static Executable Options

94
lld/test/elf/X86_64/imagebase.test Normal file
View File

@ -0,0 +1,94 @@
# Checks that segments start at the image address specified.
# Build executable
# RUN: yaml2obj -format=elf -docnum 1 %s -o %t.o
# RUN: lld -flavor gnu -target x86_64 %t.o -o %t.exe -static \
# RUN: --no-align-segments --noinhibit-exec --image-base 0x600000
# RUN: llvm-readobj -program-headers %t.exe | FileCheck %s
#
#CHECK: VirtualAddress: 0x600000
#CHECK: PhysicalAddress: 0x600000
#CHECK: VirtualAddress: 0x600178
#CHECK: PhysicalAddress: 0x600178
# object
---
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Data: ELFDATA2LSB
OSABI: ELFOSABI_GNU
Type: ET_REL
Machine: EM_X86_64
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Content: 554889E5B864000000C745FC000000005DC366666666662E0F1F840000000000554889E531C05DC3
- Name: .data
Type: SHT_PROGBITS
Flags: [ SHF_WRITE, SHF_ALLOC ]
AddressAlign: 0x0000000000000004
Content: ''
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Type: SHT_NOBITS
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AddressAlign: 0x0000000000000004
Content: '64000000'
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Content: '64000000'
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Type: SHT_RELA
Link: .symtab
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Info: .eh_frame
Relocations:
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Symbol: .text
Type: R_X86_64_PC32
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...