6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-22 10:29:35 +00:00
Code Issues Projects Releases Wiki Activity

Fix i386 relocations to Weak Definitions. The relocation entries should be

Browse Source 
external and the item to be relocated should not have the address of the
symbol added in.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103302 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kevin Enderby 2010-05-07 21:44:23 +00:00
parent 62077af40e
commit a6eeb6e226
4 changed files with 113 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
include/llvm/MC/MCMachOSymbolFlags.h Normal file
View File

@ -0,0 +1,44 @@
//===- MCMachOSymbolFlags.h - MachO Symbol Flags ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the SymbolFlags used for the MachO target.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCMACHOSYMBOLFLAGS_H
#define LLVM_MC_MCMACHOSYMBOLFLAGS_H
// These flags are mostly used in MCMachOStreamer.cpp but also needed in
// MachObjectWriter.cpp to test for Weak Definitions of symbols to emit
// the correct relocation information.
namespace llvm {
/// SymbolFlags - We store the value for the 'desc' symbol field in the lowest
/// 16 bits of the implementation defined flags.
enum SymbolFlags { // See <mach-o/nlist.h>.
SF_DescFlagsMask = 0xFFFF,
// Reference type flags.
SF_ReferenceTypeMask = 0x0007,
SF_ReferenceTypeUndefinedNonLazy = 0x0000,
SF_ReferenceTypeUndefinedLazy = 0x0001,
SF_ReferenceTypeDefined = 0x0002,
SF_ReferenceTypePrivateDefined = 0x0003,
SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
// Other 'desc' flags.
SF_NoDeadStrip = 0x0020,
SF_WeakReference = 0x0040,
SF_WeakDefinition = 0x0080
};
} // end namespace llvm
#endif

20
lib/MC/MCMachOStreamer.cpp
View File

@ -16,6 +16,7 @@
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
@ -25,25 +26,6 @@ using namespace llvm;
namespace {
class MCMachOStreamer : public MCStreamer {
/// SymbolFlags - We store the value for the 'desc' symbol field in the lowest
/// 16 bits of the implementation defined flags.
enum SymbolFlags { // See <mach-o/nlist.h>.
SF_DescFlagsMask = 0xFFFF,
// Reference type flags.
SF_ReferenceTypeMask = 0x0007,
SF_ReferenceTypeUndefinedNonLazy = 0x0000,
SF_ReferenceTypeUndefinedLazy = 0x0001,
SF_ReferenceTypeDefined = 0x0002,
SF_ReferenceTypePrivateDefined = 0x0003,
SF_ReferenceTypePrivateUndefinedNonLazy = 0x0004,
SF_ReferenceTypePrivateUndefinedLazy = 0x0005,
// Other 'desc' flags.
SF_NoDeadStrip = 0x0020,
SF_WeakReference = 0x0040,
SF_WeakDefinition = 0x0080
};
private:
MCAssembler Assembler;

13
lib/MC/MachObjectWriter.cpp
View File

@ -16,6 +16,7 @@
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MachO.h"
@ -753,9 +754,19 @@ public:
const MCSymbol *Symbol = &Target.getSymA()->getSymbol();
MCSymbolData *SD = &Asm.getSymbolData(*Symbol);
if (Symbol->isUndefined()) {
// Both references to undefined symbols and references to Weak Definitions
// get external relocation entries. This is so the static and then the
// the dynamic linker can resolve them to the actual definition that will
// be used. And in the case of Weak Definitions a reference to one will
// not always be to the definition in the same object file.
if (Symbol->isUndefined() || (SD->getFlags() & SF_WeakDefinition)) {
IsExtern = 1;
Index = SD->getIndex();
// In the case of a Weak Definition the FixedValue needs to be set to
// to not have the address of the symbol. In the case of an undefined
// symbol you can't call getSymbolAddress().
if (SD->getFlags() & SF_WeakDefinition)
FixedValue -= Layout.getSymbolAddress(SD);
Value = 0;
} else {
// The index is the section ordinal (1-based).

94
test/MC/MachO/reloc.s
View File

@ -44,6 +44,13 @@ L1:
.objc_class_name_A=0
.globl .objc_class_name_A
.text
.globl _f1
.weak_definition _f1
_f1:
.data
.long _f1
// CHECK: ('cputype', 7)
// CHECK: ('cpusubtype', 3)
// CHECK: ('filetype', 1)
@ -56,9 +63,9 @@ L1:
// CHECK: ('size', 260)
// CHECK: ('segment_name', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('vm_addr', 0)
// CHECK: ('vm_size', 63)
// CHECK: ('vm_size', 67)
// CHECK: ('file_offset', 392)
// CHECK: ('file_size', 63)
// CHECK: ('file_size', 67)
// CHECK: ('maxprot', 7)
// CHECK: ('initprot', 7)
// CHECK: ('num_sections', 3)
@ -71,7 +78,7 @@ L1:
// CHECK: ('size', 8)
// CHECK: ('offset', 392)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 456)
// CHECK: ('reloc_offset', 460)
// CHECK: ('num_reloc', 1)
// CHECK: ('flags', 0x80000400)
// CHECK: ('reserved1', 0)
@ -82,58 +89,61 @@ L1:
// CHECK: (('word-0', 0x1),
// CHECK: ('word-1', 0x5000003)),
// CHECK: ])
// CHECK: ('_section_data', '\xe92\x00\x00\x00\xeb\xf9\xc3')
// CHECK: ('_section_data', '\xe96\x00\x00\x00\xeb\xf9\xc3')
// CHECK: # Section 1
// CHECK: (('section_name', '__data\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('address', 8)
// CHECK: ('size', 43)
// CHECK: ('size', 47)
// CHECK: ('offset', 400)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 464)
// CHECK: ('num_reloc', 9)
// CHECK: ('reloc_offset', 468)
// CHECK: ('num_reloc', 10)
// CHECK: ('flags', 0x0)
// CHECK: ('reserved1', 0)
// CHECK: ('reserved2', 0)
// CHECK: ),
// CHECK: ('_relocations', [
// CHECK: # Relocation 0
// CHECK: (('word-0', 0x2b),
// CHECK: ('word-1', 0xc000007)),
// CHECK: # Relocation 1
// CHECK: (('word-0', 0x8000002a),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 1
// CHECK: # Relocation 2
// CHECK: (('word-0', 0x90000028),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 2
// CHECK: # Relocation 3
// CHECK: (('word-0', 0xa0000024),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 3
// CHECK: # Relocation 4
// CHECK: (('word-0', 0xa0000020),
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 4
// CHECK: # Relocation 5
// CHECK: (('word-0', 0xa4000014),
// CHECK: ('word-1', 0x1c)),
// CHECK: # Relocation 5
// CHECK: # Relocation 6
// CHECK: (('word-0', 0xa1000000),
// CHECK: ('word-1', 0x24)),
// CHECK: # Relocation 6
// CHECK: # Relocation 7
// CHECK: (('word-0', 0x8),
// CHECK: ('word-1', 0x4000002)),
// CHECK: # Relocation 7
// CHECK: (('word-0', 0x4),
// CHECK: ('word-1', 0xc000008)),
// CHECK: # Relocation 8
// CHECK: (('word-0', 0x4),
// CHECK: ('word-1', 0xc000009)),
// CHECK: # Relocation 9
// CHECK: (('word-0', 0x0),
// CHECK: ('word-1', 0xc000008)),
// CHECK: ('word-1', 0xc000009)),
// CHECK: ])
// CHECK: ('_section_data', '\x00\x00\x00\x00\x04\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xed\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x19\x00\x00\x00"\x00\x00\x00,\x00q')
// CHECK: ('_section_data', '\x00\x00\x00\x00\x04\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xed\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x19\x00\x00\x00"\x00\x00\x00,\x00q\x00\x00\x00\x00')
// CHECK: # Section 2
// CHECK: (('section_name', '__const\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('address', 51)
// CHECK: ('address', 55)
// CHECK: ('size', 12)
// CHECK: ('offset', 443)
// CHECK: ('offset', 447)
// CHECK: ('alignment', 0)
// CHECK: ('reloc_offset', 536)
// CHECK: ('reloc_offset', 548)
// CHECK: ('num_reloc', 4)
// CHECK: ('flags', 0x0)
// CHECK: ('reserved1', 0)
@ -151,22 +161,22 @@ L1:
// CHECK: ('word-1', 0x18)),
// CHECK: # Relocation 3
// CHECK: (('word-0', 0xa1000000),
// CHECK: ('word-1', 0x33)),
// CHECK: ('word-1', 0x37)),
// CHECK: ])
// CHECK: ('_section_data', '\x06\x00\x00\x007\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ('_section_data', '\x02\x00\x00\x00;\x00\x00\x00\x00\x00\x00\x00')
// CHECK: ])
// CHECK: ),
// CHECK: # Load Command 1
// CHECK: (('command', 2)
// CHECK: ('size', 24)
// CHECK: ('symoff', 568)
// CHECK: ('nsyms', 9)
// CHECK: ('stroff', 676)
// CHECK: ('strsize', 84)
// CHECK: ('_string_data', '\x00undef\x00local_a_ext\x00.objc_class_name_A\x00local_a\x00local_a_elt\x00local_b\x00local_c\x00bar\x00_f0\x00\x00\x00')
// CHECK: ('symoff', 580)
// CHECK: ('nsyms', 10)
// CHECK: ('stroff', 700)
// CHECK: ('strsize', 88)
// CHECK: ('_string_data', '\x00undef\x00local_a_ext\x00.objc_class_name_A\x00_f1\x00local_a\x00local_a_elt\x00local_b\x00local_c\x00bar\x00_f0\x00\x00\x00')
// CHECK: ('_symbols', [
// CHECK: # Symbol 0
// CHECK: (('n_strx', 38)
// CHECK: (('n_strx', 42)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -174,7 +184,7 @@ L1:
// CHECK: ('_string', 'local_a')
// CHECK: ),
// CHECK: # Symbol 1
// CHECK: (('n_strx', 46)
// CHECK: (('n_strx', 50)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -182,7 +192,7 @@ L1:
// CHECK: ('_string', 'local_a_elt')
// CHECK: ),
// CHECK: # Symbol 2
// CHECK: (('n_strx', 58)
// CHECK: (('n_strx', 62)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -190,7 +200,7 @@ L1:
// CHECK: ('_string', 'local_b')
// CHECK: ),
// CHECK: # Symbol 3
// CHECK: (('n_strx', 66)
// CHECK: (('n_strx', 70)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 2)
// CHECK: ('n_desc', 0)
@ -198,15 +208,15 @@ L1:
// CHECK: ('_string', 'local_c')
// CHECK: ),
// CHECK: # Symbol 4
// CHECK: (('n_strx', 74)
// CHECK: (('n_strx', 78)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 3)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 51)
// CHECK: ('n_value', 55)
// CHECK: ('_string', 'bar')
// CHECK: ),
// CHECK: # Symbol 5
// CHECK: (('n_strx', 78)
// CHECK: (('n_strx', 82)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 1)
// CHECK: ('n_desc', 0)
@ -222,6 +232,14 @@ L1:
// CHECK: ('_string', '.objc_class_name_A')
// CHECK: ),
// CHECK: # Symbol 7
// CHECK: (('n_strx', 38)
// CHECK: ('n_type', 0xf)
// CHECK: ('n_sect', 1)
// CHECK: ('n_desc', 128)
// CHECK: ('n_value', 8)
// CHECK: ('_string', '_f1')
// CHECK: ),
// CHECK: # Symbol 8
// CHECK: (('n_strx', 7)
// CHECK: ('n_type', 0xf)
// CHECK: ('n_sect', 2)
@ -229,7 +247,7 @@ L1:
// CHECK: ('n_value', 16)
// CHECK: ('_string', 'local_a_ext')
// CHECK: ),
// CHECK: # Symbol 8
// CHECK: # Symbol 9
// CHECK: (('n_strx', 1)
// CHECK: ('n_type', 0x1)
// CHECK: ('n_sect', 0)
@ -245,8 +263,8 @@ L1:
// CHECK: ('ilocalsym', 0)
// CHECK: ('nlocalsym', 6)
// CHECK: ('iextdefsym', 6)
// CHECK: ('nextdefsym', 2)
// CHECK: ('iundefsym', 8)
// CHECK: ('nextdefsym', 3)
// CHECK: ('iundefsym', 9)
// CHECK: ('nundefsym', 1)
// CHECK: ('tocoff', 0)
// CHECK: ('ntoc', 0)