MC/Mach-O/x86_64: Add relocation support.

 - This is "extraordinarily" Darwin 'as' compatible. See the litany of FIXMEs littered about for more information.
 - There are a few cases which seem to clearly be 'as' bugs which I have left unsupported, and there is one cases where we diverge but should fix if it blocks diffing .o files (Darwin 'as' ends up widening a jump unnecessarily).
 - 403.gcc build, runs, and diffs equivalently to the 'as' built version now (using llvm-mc). However, it builds so slowly that I wouldn't recommend trying it quite yet. :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98974 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 901 insertions, 0 deletions

diff --git a/test/MC/MachO/darwin-x86_64-diff-relocs.s b/test/MC/MachO/darwin-x86_64-diff-relocs.s
new file mode 100644
index 0000000000..38fa074fde
--- /dev/null
+++ b/test/MC/MachO/darwin-x86_64-diff-relocs.s
@@ -0,0 +1,329 @@
+// RUN: llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -o - | macho-dump --dump-section-data | FileCheck %s
+
+        .text
+
+// FIXME: llvm-mc doesn't handle this in a way we can make compatible with 'as',
+// currently, because of how we handle assembler variables.
+//
+// See <rdar://problem/7763719> improve handling of absolute symbols
+
+// _baz = 4
+
+_foo:
+        xorl %eax,%eax
+_g0:
+        xorl %eax,%eax
+L0:
+        jmp 4
+//        jmp _baz
+
+// FIXME: Darwin 'as' for historical reasons widens this jump, but doesn't emit
+// a relocation. It seems like 'as' widens any jump that is not to a temporary,
+// which is inherited from the x86_32 behavior, even though x86_64 could do
+// better.
+//        jmp _g0
+
+        jmp L0
+        jmp _g1
+
+// FIXME: Darwin 'as' gets this wrong as well, even though it could get it right
+// given the other things we do on x86_64. It is using a short jump here. This
+// is probably fallout of the hack that exists for x86_32.
+//        jmp L1
+
+// FIXME: We don't support this, and would currently get it wrong, it should be a jump to an absolute address.
+//        jmp L0 - _g0
+
+//        jmp _g1 - _g0
+// FIXME: Darwin 'as' comes up with 'SIGNED' here instead of 'BRANCH'.
+//        jmp _g1 - L1
+// FIXME: Darwin 'as' gets this completely wrong. It ends up with a single
+// branch relocation. Fallout from the other delta hack?
+//        jmp L1 - _g0
+
+        jmp _g2
+        jmp L2
+        jmp _g3
+        jmp L3
+// FIXME: Darwin 'as' gets this completely wrong. It ends up with a single
+// branch relocation. Fallout from the other delta hack?
+//        jmp L2 - _g3
+//        jmp _g3 - _g2
+// FIXME: Darwin 'as' comes up with 'SIGNED' here instead of 'BRANCH'.
+//        jmp _g3 - L3
+// FIXME: Darwin 'as' gets this completely wrong. It ends up with a single
+// branch relocation. Fallout from the other delta hack?
+//        jmp L3 - _g2
+
+        movl %eax,4(%rip)
+//        movl %eax,_baz(%rip)
+        movl %eax,_g0(%rip)
+        movl %eax,L0(%rip)
+        movl %eax,_g1(%rip)
+        movl %eax,L1(%rip)
+
+// FIXME: Darwin 'as' gets most of these wrong, and there is an ambiguity in ATT
+// syntax in what they should mean in the first place (absolute or
+// rip-relative address).
+//        movl %eax,L0 - _g0(%rip)
+//        movl %eax,_g1 - _g0(%rip)
+//        movl %eax,_g1 - L1(%rip)
+//        movl %eax,L1 - _g0(%rip)
+
+        movl %eax,_g2(%rip)
+        movl %eax,L2(%rip)
+        movl %eax,_g3(%rip)
+        movl %eax,L3(%rip)
+
+// FIXME: Darwin 'as' gets most of these wrong, and there is an ambiguity in ATT
+// syntax in what they should mean in the first place (absolute or
+// rip-relative address).
+//        movl %eax,L2 - _g2(%rip)
+//        movl %eax,_g3 - _g2(%rip)
+//        movl %eax,_g3 - L3(%rip)
+//        movl %eax,L3 - _g2(%rip)
+
+_g1:
+        xorl %eax,%eax
+L1:
+        xorl %eax,%eax
+
+        .data
+_g2:
+        xorl %eax,%eax
+L2:
+        .quad 4
+//        .quad _baz
+        .quad _g2
+        .quad L2
+        .quad _g3
+        .quad L3
+        .quad L2 - _g2
+        .quad _g3 - _g2
+        .quad L3 - _g2
+        .quad L3 - _g3
+
+        .quad _g0
+        .quad L0
+        .quad _g1
+        .quad L1
+        .quad L0 - _g0
+        .quad _g1 - _g0
+        .quad L1 - _g0
+        .quad L1 - _g1
+
+_g3:
+        xorl %eax,%eax
+L3:
+        xorl %eax,%eax
+
+// CHECK: ('cputype', 16777223)
+// CHECK: ('cpusubtype', 3)
+// CHECK: ('filetype', 1)
+// CHECK: ('num_load_commands', 1)
+// CHECK: ('load_commands_size', 336)
+// CHECK: ('flag', 0)
+// CHECK: ('reserved', 0)
+// CHECK: ('load_commands', [
+// CHECK:   # Load Command 0
+// CHECK:  (('command', 25)
+// CHECK:   ('size', 232)
+// 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', 236)
+// CHECK:   ('file_offset', 368)
+// CHECK:   ('file_size', 236)
+// CHECK:   ('maxprot', 7)
+// CHECK:   ('initprot', 7)
+// CHECK:   ('num_sections', 2)
+// CHECK:   ('flags', 0)
+// CHECK:   ('sections', [
+// CHECK:     # Section 0
+// CHECK:    (('section_name', '__text\x00\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', 0)
+// CHECK:     ('size', 94)
+// CHECK:     ('offset', 368)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 604)
+// CHECK:     ('num_reloc', 12)
+// CHECK:     ('flags', 0x80000400)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:     ('reserved3', 0)
+// CHECK:    ),
+// CHECK:   ('_relocations', [
+
+// FIXME: Unfortunately, we do not get these relocations in exactly the same
+// order as Darwin 'as'. It turns out that 'as' *usually* ends up emitting
+// them in reverse address order, but sometimes it allocates some
+// additional relocations late so these end up preceed the other entries. I
+// haven't figured out the exact criteria for this yet.
+        
+// CHECK:     (('word-0', 0x56),
+// CHECK:      ('word-1', 0x1d000004)),
+// CHECK:     (('word-0', 0x50),
+// CHECK:      ('word-1', 0x1d000004)),
+// CHECK:     (('word-0', 0x4a),
+// CHECK:      ('word-1', 0x1d000003)),
+// CHECK:     (('word-0', 0x44),
+// CHECK:      ('word-1', 0x1d000003)),
+// CHECK:     (('word-0', 0x3e),
+// CHECK:      ('word-1', 0x1d000002)),
+// CHECK:     (('word-0', 0x38),
+// CHECK:      ('word-1', 0x1d000002)),
+// CHECK:     (('word-0', 0x20),
+// CHECK:      ('word-1', 0x2d000004)),
+// CHECK:     (('word-0', 0x1b),
+// CHECK:      ('word-1', 0x2d000004)),
+// CHECK:     (('word-0', 0x16),
+// CHECK:      ('word-1', 0x2d000003)),
+// CHECK:     (('word-0', 0x11),
+// CHECK:      ('word-1', 0x2d000003)),
+// CHECK:     (('word-0', 0xc),
+// CHECK:      ('word-1', 0x2d000002)),
+// CHECK:     (('word-0', 0x5),
+// CHECK:      ('word-1', 0x2d000000)),
+// CHECK:   ])
+// 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', 94)
+// CHECK:     ('size', 142)
+// CHECK:     ('offset', 462)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 700)
+// CHECK:     ('num_reloc', 16)
+// CHECK:     ('flags', 0x400)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:     ('reserved3', 0)
+// CHECK:    ),
+// CHECK:   ('_relocations', [
+// CHECK:     # Relocation 0
+// CHECK:     (('word-0', 0x7a),
+// CHECK:      ('word-1', 0x5e000001)),
+// CHECK:     # Relocation 1
+// CHECK:     (('word-0', 0x7a),
+// CHECK:      ('word-1', 0xe000002)),
+// CHECK:     # Relocation 2
+// CHECK:     (('word-0', 0x72),
+// CHECK:      ('word-1', 0x5e000001)),
+// CHECK:     # Relocation 3
+// CHECK:     (('word-0', 0x72),
+// CHECK:      ('word-1', 0xe000002)),
+// CHECK:     # Relocation 4
+// CHECK:     (('word-0', 0x62),
+// CHECK:      ('word-1', 0xe000002)),
+// CHECK:     # Relocation 5
+// CHECK:     (('word-0', 0x5a),
+// CHECK:      ('word-1', 0xe000002)),
+// CHECK:     # Relocation 6
+// CHECK:     (('word-0', 0x52),
+// CHECK:      ('word-1', 0xe000001)),
+// CHECK:     # Relocation 7
+// CHECK:     (('word-0', 0x4a),
+// CHECK:      ('word-1', 0xe000001)),
+// CHECK:     # Relocation 8
+// CHECK:     (('word-0', 0x3a),
+// CHECK:      ('word-1', 0x5e000003)),
+// CHECK:     # Relocation 9
+// CHECK:     (('word-0', 0x3a),
+// CHECK:      ('word-1', 0xe000004)),
+// CHECK:     # Relocation 10
+// CHECK:     (('word-0', 0x32),
+// CHECK:      ('word-1', 0x5e000003)),
+// CHECK:     # Relocation 11
+// CHECK:     (('word-0', 0x32),
+// CHECK:      ('word-1', 0xe000004)),
+// CHECK:     # Relocation 12
+// CHECK:     (('word-0', 0x22),
+// CHECK:      ('word-1', 0xe000004)),
+// CHECK:     # Relocation 13
+// CHECK:     (('word-0', 0x1a),
+// CHECK:      ('word-1', 0xe000004)),
+// CHECK:     # Relocation 14
+// CHECK:     (('word-0', 0x12),
+// CHECK:      ('word-1', 0xe000003)),
+// CHECK:     # Relocation 15
+// CHECK:     (('word-0', 0xa),
+// CHECK:      ('word-1', 0xe000003)),
+// CHECK:   ])
+// CHECK:   ])
+// CHECK:  ),
+// CHECK:   # Load Command 1
+// CHECK:  (('command', 2)
+// CHECK:   ('size', 24)
+// CHECK:   ('symoff', 828)
+// CHECK:   ('nsyms', 5)
+// CHECK:   ('stroff', 908)
+// CHECK:   ('strsize', 24)
+// CHECK:   ('_string_data', '\x00_foo\x00_g0\x00_g1\x00_g2\x00_g3\x00\x00\x00')
+// CHECK:   ('_symbols', [
+// CHECK:     # Symbol 0
+// CHECK:    (('n_strx', 1)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 0)
+// CHECK:     ('_string', '_foo')
+// CHECK:    ),
+// CHECK:     # Symbol 1
+// CHECK:    (('n_strx', 6)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 2)
+// CHECK:     ('_string', '_g0')
+// CHECK:    ),
+// CHECK:     # Symbol 2
+// CHECK:    (('n_strx', 10)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 90)
+// CHECK:     ('_string', '_g1')
+// CHECK:    ),
+// CHECK:     # Symbol 3
+// CHECK:    (('n_strx', 14)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 2)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 94)
+// CHECK:     ('_string', '_g2')
+// CHECK:    ),
+// CHECK:     # Symbol 4
+// CHECK:    (('n_strx', 18)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 2)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 232)
+// CHECK:     ('_string', '_g3')
+// CHECK:    ),
+// CHECK:   ])
+// CHECK:  ),
+// CHECK:   # Load Command 2
+// CHECK:  (('command', 11)
+// CHECK:   ('size', 80)
+// CHECK:   ('ilocalsym', 0)
+// CHECK:   ('nlocalsym', 5)
+// CHECK:   ('iextdefsym', 5)
+// CHECK:   ('nextdefsym', 0)
+// CHECK:   ('iundefsym', 5)
+// CHECK:   ('nundefsym', 0)
+// CHECK:   ('tocoff', 0)
+// CHECK:   ('ntoc', 0)
+// CHECK:   ('modtaboff', 0)
+// CHECK:   ('nmodtab', 0)
+// CHECK:   ('extrefsymoff', 0)
+// CHECK:   ('nextrefsyms', 0)
+// CHECK:   ('indirectsymoff', 0)
+// CHECK:   ('nindirectsyms', 0)
+// CHECK:   ('extreloff', 0)
+// CHECK:   ('nextrel', 0)
+// CHECK:   ('locreloff', 0)
+// CHECK:   ('nlocrel', 0)
+// CHECK:   ('_indirect_symbols', [
+// CHECK:   ])
+// CHECK:  ),
+// CHECK: ])
diff --git a/test/MC/MachO/darwin-x86_64-reloc-offsets.s b/test/MC/MachO/darwin-x86_64-reloc-offsets.s
new file mode 100644
index 0000000000..ab6820e4a8
--- /dev/null
+++ b/test/MC/MachO/darwin-x86_64-reloc-offsets.s
@@ -0,0 +1,343 @@
+// RUN: llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -o - | macho-dump --dump-section-data | FileCheck %s
+
+        .data
+
+        .org 0x10
+L0:
+        .long 0
+        .long 0
+        .long 0
+        .long 0
+
+_d:
+        .long 0
+L1:
+        .long 0
+
+        .text
+
+// These generate normal x86_64 (external) relocations. They could all use
+// SIGNED, but don't for pedantic compatibility with Darwin 'as'.
+
+        // SIGNED1
+ 	movb  $0x12, _d(%rip)
+
+        // SIGNED
+ 	movb  $0x12, _d + 1(%rip)
+
+        // SIGNED4
+ 	movl  $0x12345678, _d(%rip)
+
+        // SIGNED
+ 	movl  $0x12345678, _d + 1(%rip)
+
+        // SIGNED2
+ 	movl  $0x12345678, _d + 2(%rip)
+
+        // SIGNED1
+ 	movl  $0x12345678, _d + 3(%rip)
+
+        // SIGNED
+ 	movl  $0x12345678, _d + 4(%rip)
+
+	movb  %al, _d(%rip)
+ 	movb  %al, _d + 1(%rip)
+ 	movl  %eax, _d(%rip)
+ 	movl  %eax, _d + 1(%rip)
+ 	movl  %eax, _d + 2(%rip)
+ 	movl  %eax, _d + 3(%rip)
+ 	movl  %eax, _d + 4(%rip)
+
+// These have to use local relocations. Since that uses an offset into the
+// section in x86_64 (as opposed to a scattered relocation), and since the
+// linker can only decode this to an atom + offset by scanning the section,
+// it is not possible to correctly encode these without SIGNED<N>. This is
+// ultimately due to a design flaw in the x86_64 relocation format, it is
+// not possible to encode an address (L<foo> + <constant>) which is outside the
+// atom containing L<foo>.
+
+        // SIGNED1
+ 	movb  $0x12, L0(%rip)
+
+        // SIGNED
+ 	movb  $0x12, L0 + 1(%rip)
+
+        // SIGNED4
+ 	movl  $0x12345678, L0(%rip)
+
+        // SIGNED
+ 	movl  $0x12345678, L0 + 1(%rip)
+
+        // SIGNED2
+ 	movl  $0x12345678, L0 + 2(%rip)
+
+        // SIGNED1
+ 	movl  $0x12345678, L0 + 3(%rip)
+
+        // SIGNED
+ 	movl  $0x12345678, L0 + 4(%rip)
+
+ 	movb  %al, L0(%rip)
+ 	movb  %al, L0 + 1(%rip)
+ 	movl  %eax, L0(%rip)
+ 	movl  %eax, L0 + 1(%rip)
+ 	movl  %eax, L0 + 2(%rip)
+ 	movl  %eax, L0 + 3(%rip)
+ 	movl  %eax, L0 + 4(%rip)
+
+        // SIGNED1
+ 	movb  $0x12, L1(%rip)
+
+        // SIGNED
+ 	movb  $0x12, L1 + 1(%rip)
+
+        // SIGNED4
+ 	movl  $0x12345678, L1(%rip)
+
+        // SIGNED
+ 	movl  $0x12345678, L1 + 1(%rip)
+
+        // SIGNED2
+ 	movl  $0x12345678, L1 + 2(%rip)
+
+        // SIGNED1
+ 	movl  $0x12345678, L1 + 3(%rip)
+
+        // SIGNED
+ 	movl  $0x12345678, L1 + 4(%rip)
+
+ 	movb  %al, L1(%rip)
+ 	movb  %al, L1 + 1(%rip)
+ 	movl  %eax, L1(%rip)
+ 	movl  %eax, L1 + 1(%rip)
+ 	movl  %eax, L1 + 2(%rip)
+ 	movl  %eax, L1 + 3(%rip)
+ 	movl  %eax, L1 + 4(%rip)
+
+// CHECK: ('cputype', 16777223)
+// CHECK: ('cpusubtype', 3)
+// CHECK: ('filetype', 1)
+// CHECK: ('num_load_commands', 1)
+// CHECK: ('load_commands_size', 336)
+// CHECK: ('flag', 0)
+// CHECK: ('reserved', 0)
+// CHECK: ('load_commands', [
+// CHECK:   # Load Command 0
+// CHECK:  (('command', 25)
+// CHECK:   ('size', 232)
+// 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', 358)
+// CHECK:   ('file_offset', 368)
+// CHECK:   ('file_size', 358)
+// CHECK:   ('maxprot', 7)
+// CHECK:   ('initprot', 7)
+// CHECK:   ('num_sections', 2)
+// CHECK:   ('flags', 0)
+// CHECK:   ('sections', [
+// CHECK:     # Section 0
+// CHECK:    (('section_name', '__text\x00\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', 0)
+// CHECK:     ('size', 318)
+// CHECK:     ('offset', 368)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 728)
+// CHECK:     ('num_reloc', 42)
+// CHECK:     ('flags', 0x80000400)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:     ('reserved3', 0)
+// CHECK:    ),
+// CHECK:   ('_relocations', [
+// CHECK:     # Relocation 0
+// CHECK:     (('word-0', 0x13a),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 1
+// CHECK:     (('word-0', 0x134),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 2
+// CHECK:     (('word-0', 0x12e),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 3
+// CHECK:     (('word-0', 0x128),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 4
+// CHECK:     (('word-0', 0x122),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 5
+// CHECK:     (('word-0', 0x11c),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 6
+// CHECK:     (('word-0', 0x116),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 7
+// CHECK:     (('word-0', 0x10c),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 8
+// CHECK:     (('word-0', 0x102),
+// CHECK:      ('word-1', 0x6d000000)),
+// CHECK:     # Relocation 9
+// CHECK:     (('word-0', 0xf8),
+// CHECK:      ('word-1', 0x7d000000)),
+// CHECK:     # Relocation 10
+// CHECK:     (('word-0', 0xee),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 11
+// CHECK:     (('word-0', 0xe4),
+// CHECK:      ('word-1', 0x8d000000)),
+// CHECK:     # Relocation 12
+// CHECK:     (('word-0', 0xdd),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 13
+// CHECK:     (('word-0', 0xd6),
+// CHECK:      ('word-1', 0x6d000000)),
+// CHECK:     # Relocation 14
+// CHECK:     (('word-0', 0xd0),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 15
+// CHECK:     (('word-0', 0xca),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 16
+// CHECK:     (('word-0', 0xc4),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 17
+// CHECK:     (('word-0', 0xbe),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 18
+// CHECK:     (('word-0', 0xb8),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 19
+// CHECK:     (('word-0', 0xb2),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 20
+// CHECK:     (('word-0', 0xac),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 21
+// CHECK:     (('word-0', 0xa2),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 22
+// CHECK:     (('word-0', 0x98),
+// CHECK:      ('word-1', 0x65000002)),
+// CHECK:     # Relocation 23
+// CHECK:     (('word-0', 0x8e),
+// CHECK:      ('word-1', 0x75000002)),
+// CHECK:     # Relocation 24
+// CHECK:     (('word-0', 0x84),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 25
+// CHECK:     (('word-0', 0x7a),
+// CHECK:      ('word-1', 0x85000002)),
+// CHECK:     # Relocation 26
+// CHECK:     (('word-0', 0x73),
+// CHECK:      ('word-1', 0x15000002)),
+// CHECK:     # Relocation 27
+// CHECK:     (('word-0', 0x6c),
+// CHECK:      ('word-1', 0x65000002)),
+// CHECK:     # Relocation 28
+// CHECK:     (('word-0', 0x66),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 29
+// CHECK:     (('word-0', 0x60),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 30
+// CHECK:     (('word-0', 0x5a),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 31
+// CHECK:     (('word-0', 0x54),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 32
+// CHECK:     (('word-0', 0x4e),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 33
+// CHECK:     (('word-0', 0x48),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 34
+// CHECK:     (('word-0', 0x42),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 35
+// CHECK:     (('word-0', 0x38),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 36
+// CHECK:     (('word-0', 0x2e),
+// CHECK:      ('word-1', 0x6d000000)),
+// CHECK:     # Relocation 37
+// CHECK:     (('word-0', 0x24),
+// CHECK:      ('word-1', 0x7d000000)),
+// CHECK:     # Relocation 38
+// CHECK:     (('word-0', 0x1a),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 39
+// CHECK:     (('word-0', 0x10),
+// CHECK:      ('word-1', 0x8d000000)),
+// CHECK:     # Relocation 40
+// CHECK:     (('word-0', 0x9),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 41
+// CHECK:     (('word-0', 0x2),
+// CHECK:      ('word-1', 0x6d000000)),
+// CHECK:   ])
+// CHECK:   ('_section_data', '\xc6\x05\xff\xff\xff\xff\x12\xc6\x05\x00\x00\x00\x00\x12\xc7\x05\xfc\xff\xff\xffxV4\x12\xc7\x05\xfd\xff\xff\xffxV4\x12\xc7\x05\xfe\xff\xff\xffxV4\x12\xc7\x05\xff\xff\xff\xffxV4\x12\xc7\x05\x00\x00\x00\x00xV4\x12\x88\x05\x00\x00\x00\x00\x88\x05\x01\x00\x00\x00\x89\x05\x00\x00\x00\x00\x89\x05\x01\x00\x00\x00\x89\x05\x02\x00\x00\x00\x89\x05\x03\x00\x00\x00\x89\x05\x04\x00\x00\x00\xc6\x05\xdd\x00\x00\x00\x12\xc6\x05\xd7\x00\x00\x00\x12\xc7\x05\xcc\x00\x00\x00xV4\x12\xc7\x05\xc3\x00\x00\x00xV4\x12\xc7\x05\xba\x00\x00\x00xV4\x12\xc7\x05\xb1\x00\x00\x00xV4\x12\xc7\x05\xa8\x00\x00\x00xV4\x12\x88\x05\x9e\x00\x00\x00\x88\x05\x99\x00\x00\x00\x89\x05\x92\x00\x00\x00\x89\x05\x8d\x00\x00\x00\x89\x05\x88\x00\x00\x00\x89\x05\x83\x00\x00\x00\x89\x05~\x00\x00\x00\xc6\x05\x03\x00\x00\x00\x12\xc6\x05\x04\x00\x00\x00\x12\xc7\x05\x00\x00\x00\x00xV4\x12\xc7\x05\x01\x00\x00\x00xV4\x12\xc7\x05\x02\x00\x00\x00xV4\x12\xc7\x05\x03\x00\x00\x00xV4\x12\xc7\x05\x04\x00\x00\x00xV4\x12\x88\x05\x04\x00\x00\x00\x88\x05\x05\x00\x00\x00\x89\x05\x04\x00\x00\x00\x89\x05\x05\x00\x00\x00\x89\x05\x06\x00\x00\x00\x89\x05\x07\x00\x00\x00\x89\x05\x08\x00\x00\x00')
+// 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', 318)
+// CHECK:     ('size', 40)
+// CHECK:     ('offset', 686)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:     ('reserved3', 0)
+// CHECK:    ),
+// CHECK:   ('_relocations', [
+// CHECK:   ])
+// CHECK:   ('_section_data', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:   ])
+// CHECK:  ),
+// CHECK:   # Load Command 1
+// CHECK:  (('command', 2)
+// CHECK:   ('size', 24)
+// CHECK:   ('symoff', 1064)
+// CHECK:   ('nsyms', 1)
+// CHECK:   ('stroff', 1080)
+// CHECK:   ('strsize', 4)
+// CHECK:   ('_string_data', '\x00_d\x00')
+// CHECK:   ('_symbols', [
+// CHECK:     # Symbol 0
+// CHECK:    (('n_strx', 1)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 2)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 350)
+// CHECK:     ('_string', '_d')
+// CHECK:    ),
+// CHECK:   ])
+// CHECK:  ),
+// CHECK:   # Load Command 2
+// CHECK:  (('command', 11)
+// CHECK:   ('size', 80)
+// CHECK:   ('ilocalsym', 0)
+// CHECK:   ('nlocalsym', 1)
+// CHECK:   ('iextdefsym', 1)
+// CHECK:   ('nextdefsym', 0)
+// CHECK:   ('iundefsym', 1)
+// CHECK:   ('nundefsym', 0)
+// CHECK:   ('tocoff', 0)
+// CHECK:   ('ntoc', 0)
+// CHECK:   ('modtaboff', 0)
+// CHECK:   ('nmodtab', 0)
+// CHECK:   ('extrefsymoff', 0)
+// CHECK:   ('nextrefsyms', 0)
+// CHECK:   ('indirectsymoff', 0)
+// CHECK:   ('nindirectsyms', 0)
+// CHECK:   ('extreloff', 0)
+// CHECK:   ('nextrel', 0)
+// CHECK:   ('locreloff', 0)
+// CHECK:   ('nlocrel', 0)
+// CHECK:   ('_indirect_symbols', [
+// CHECK:   ])
+// CHECK:  ),
+// CHECK: ])
diff --git a/test/MC/MachO/darwin-x86_64-reloc.s b/test/MC/MachO/darwin-x86_64-reloc.s
new file mode 100644
index 0000000000..6b325b085e
--- /dev/null
+++ b/test/MC/MachO/darwin-x86_64-reloc.s
@@ -0,0 +1,229 @@
+// RUN: llvm-mc -triple x86_64-apple-darwin9 %s -filetype=obj -o - | macho-dump --dump-section-data | FileCheck %s
+
+// These examples are taken from <mach-o/x86_64/reloc.h>.
+
+        .text
+_foo:
+        ret
+
+_baz:
+        call _foo
+ 	call _foo+4
+ 	movq _foo@GOTPCREL(%rip), %rax
+ 	pushq _foo@GOTPCREL(%rip)
+ 	movl _foo(%rip), %eax
+ 	movl _foo+4(%rip), %eax
+ 	movb  $0x12, _foo(%rip)
+ 	movl  $0x12345678, _foo(%rip)
+ 	.quad _foo
+_bar:
+ 	.quad _foo+4
+ 	.quad _foo - _bar
+ 	.quad _foo - _bar + 4
+ 	.long _foo - _bar
+ 	leaq L1(%rip), %rax
+ 	leaq L0(%rip), %rax
+        addl $6,L0(%rip)
+        addw $500,L0(%rip)
+        addl $500,L0(%rip)
+
+_prev:
+        .space 12,0x90
+ 	.quad L1
+L0:
+        .quad L0
+L_pc:
+ 	.quad _foo - L_pc
+ 	.quad _foo - L1
+L1:
+ 	.quad L1 - _prev
+
+// CHECK: ('cputype', 16777223)
+// CHECK: ('cpusubtype', 3)
+// CHECK: ('filetype', 1)
+// CHECK: ('num_load_commands', 1)
+// CHECK: ('load_commands_size', 256)
+// CHECK: ('flag', 0)
+// CHECK: ('reserved', 0)
+// CHECK: ('load_commands', [
+// CHECK:   # Load Command 0
+// CHECK:  (('command', 25)
+// CHECK:   ('size', 152)
+// 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', 181)
+// CHECK:   ('file_offset', 288)
+// CHECK:   ('file_size', 181)
+// CHECK:   ('maxprot', 7)
+// CHECK:   ('initprot', 7)
+// CHECK:   ('num_sections', 1)
+// CHECK:   ('flags', 0)
+// CHECK:   ('sections', [
+// CHECK:     # Section 0
+// CHECK:    (('section_name', '__text\x00\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', 0)
+// CHECK:     ('size', 181)
+// CHECK:     ('offset', 288)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 472)
+// CHECK:     ('num_reloc', 27)
+// CHECK:     ('flags', 0x80000400)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:     ('reserved3', 0)
+// CHECK:    ),
+// CHECK:   ('_relocations', [
+// CHECK:     # Relocation 0
+// CHECK:     (('word-0', 0xa5),
+// CHECK:      ('word-1', 0x5e000003)),
+// CHECK:     # Relocation 1
+// CHECK:     (('word-0', 0xa5),
+// CHECK:      ('word-1', 0xe000000)),
+// CHECK:     # Relocation 2
+// CHECK:     (('word-0', 0x9d),
+// CHECK:      ('word-1', 0x5e000003)),
+// CHECK:     # Relocation 3
+// CHECK:     (('word-0', 0x9d),
+// CHECK:      ('word-1', 0xe000000)),
+// CHECK:     # Relocation 4
+// CHECK:     (('word-0', 0x95),
+// CHECK:      ('word-1', 0xe000003)),
+// CHECK:     # Relocation 5
+// CHECK:     (('word-0', 0x8d),
+// CHECK:      ('word-1', 0xe000003)),
+// CHECK:     # Relocation 6
+// CHECK:     (('word-0', 0x79),
+// CHECK:      ('word-1', 0x8d000003)),
+// CHECK:     # Relocation 7
+// CHECK:     (('word-0', 0x71),
+// CHECK:      ('word-1', 0x7d000003)),
+// CHECK:     # Relocation 8
+// CHECK:     (('word-0', 0x69),
+// CHECK:      ('word-1', 0x6d000003)),
+// CHECK:     # Relocation 9
+// CHECK:     (('word-0', 0x63),
+// CHECK:      ('word-1', 0x1d000003)),
+// CHECK:     # Relocation 10
+// CHECK:     (('word-0', 0x5c),
+// CHECK:      ('word-1', 0x1d000003)),
+// CHECK:     # Relocation 11
+// CHECK:     (('word-0', 0x55),
+// CHECK:      ('word-1', 0x5c000002)),
+// CHECK:     # Relocation 12
+// CHECK:     (('word-0', 0x55),
+// CHECK:      ('word-1', 0xc000000)),
+// CHECK:     # Relocation 13
+// CHECK:     (('word-0', 0x4d),
+// CHECK:      ('word-1', 0x5e000002)),
+// CHECK:     # Relocation 14
+// CHECK:     (('word-0', 0x4d),
+// CHECK:      ('word-1', 0xe000000)),
+// CHECK:     # Relocation 15
+// CHECK:     (('word-0', 0x45),
+// CHECK:      ('word-1', 0x5e000002)),
+// CHECK:     # Relocation 16
+// CHECK:     (('word-0', 0x45),
+// CHECK:      ('word-1', 0xe000000)),
+// CHECK:     # Relocation 17
+// CHECK:     (('word-0', 0x3d),
+// CHECK:      ('word-1', 0xe000000)),
+// CHECK:     # Relocation 18
+// CHECK:     (('word-0', 0x35),
+// CHECK:      ('word-1', 0xe000000)),
+// CHECK:     # Relocation 19
+// CHECK:     (('word-0', 0x2d),
+// CHECK:      ('word-1', 0x8d000000)),
+// CHECK:     # Relocation 20
+// CHECK:     (('word-0', 0x26),
+// CHECK:      ('word-1', 0x6d000000)),
+// CHECK:     # Relocation 21
+// CHECK:     (('word-0', 0x20),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 22
+// CHECK:     (('word-0', 0x1a),
+// CHECK:      ('word-1', 0x1d000000)),
+// CHECK:     # Relocation 23
+// CHECK:     (('word-0', 0x14),
+// CHECK:      ('word-1', 0x4d000000)),
+// CHECK:     # Relocation 24
+// CHECK:     (('word-0', 0xe),
+// CHECK:      ('word-1', 0x3d000000)),
+// CHECK:     # Relocation 25
+// CHECK:     (('word-0', 0x7),
+// CHECK:      ('word-1', 0x2d000000)),
+// CHECK:     # Relocation 26
+// CHECK:     (('word-0', 0x2),
+// CHECK:      ('word-1', 0x2d000000)),
+// CHECK:   ])
+// CHECK:   ('_section_data', '\xc3\xe8\x00\x00\x00\x00\xe8\x04\x00\x00\x00H\x8b\x05\x00\x00\x00\x00\xff5\x00\x00\x00\x00\x8b\x05\x00\x00\x00\x00\x8b\x05\x04\x00\x00\x00\xc6\x05\xff\xff\xff\xff\x12\xc7\x05\xfc\xff\xff\xffxV4\x12\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00H\x8d\x05,\x00\x00\x00H\x8d\x05\x14\x00\x00\x00\x83\x05\x13\x00\x00\x00\x06f\x81\x05\x12\x00\x00\x00\xf4\x01\x81\x05\x10\x00\x00\x00\xf4\x01\x00\x00\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90,\x00\x00\x00\x00\x00\x00\x00\x14\x00\x00\x00\x00\x00\x00\x00\xe4\xff\xff\xff\xff\xff\xff\xff\xd4\xff\xff\xff\xff\xff\xff\xff,\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:   ])
+// CHECK:  ),
+// CHECK:   # Load Command 1
+// CHECK:  (('command', 2)
+// CHECK:   ('size', 24)
+// CHECK:   ('symoff', 688)
+// CHECK:   ('nsyms', 4)
+// CHECK:   ('stroff', 752)
+// CHECK:   ('strsize', 24)
+// CHECK:   ('_string_data', '\x00_foo\x00_baz\x00_bar\x00_prev\x00\x00\x00')
+// CHECK:   ('_symbols', [
+// CHECK:     # Symbol 0
+// CHECK:    (('n_strx', 1)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 0)
+// CHECK:     ('_string', '_foo')
+// CHECK:    ),
+// CHECK:     # Symbol 1
+// CHECK:    (('n_strx', 6)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 1)
+// CHECK:     ('_string', '_baz')
+// CHECK:    ),
+// CHECK:     # Symbol 2
+// CHECK:    (('n_strx', 11)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 61)
+// CHECK:     ('_string', '_bar')
+// CHECK:    ),
+// CHECK:     # Symbol 3
+// CHECK:    (('n_strx', 16)
+// CHECK:     ('n_type', 0xe)
+// CHECK:     ('n_sect', 1)
+// CHECK:     ('n_desc', 0)
+// CHECK:     ('n_value', 129)
+// CHECK:     ('_string', '_prev')
+// CHECK:    ),
+// CHECK:   ])
+// CHECK:  ),
+// CHECK:   # Load Command 2
+// CHECK:  (('command', 11)
+// CHECK:   ('size', 80)
+// CHECK:   ('ilocalsym', 0)
+// CHECK:   ('nlocalsym', 4)
+// CHECK:   ('iextdefsym', 4)
+// CHECK:   ('nextdefsym', 0)
+// CHECK:   ('iundefsym', 4)
+// CHECK:   ('nundefsym', 0)
+// CHECK:   ('tocoff', 0)
+// CHECK:   ('ntoc', 0)
+// CHECK:   ('modtaboff', 0)
+// CHECK:   ('nmodtab', 0)
+// CHECK:   ('extrefsymoff', 0)
+// CHECK:   ('nextrefsyms', 0)
+// CHECK:   ('indirectsymoff', 0)
+// CHECK:   ('nindirectsyms', 0)
+// CHECK:   ('extreloff', 0)
+// CHECK:   ('nextrel', 0)
+// CHECK:   ('locreloff', 0)
+// CHECK:   ('nlocrel', 0)
+// CHECK:   ('_indirect_symbols', [
+// CHECK:   ])
+// CHECK:  ),
+// CHECK: ])