c3e4f3b231
The Mach kernel & codesign on arm64 macOS has strict requirements for alignment and sequence of segments and sections. Dyld probably is just as picky, though kernel & codesign reject malformed Mach-O files before dyld ever has a chance. I developed this diff by incrementally changing alignments & sequences to match the output of ld64. I stopped when my hello-world test program started working: `codesign --verify` succeded, and `execve(2)` didn't immediately fail with `errno == EBADMACHO` = `"Malformed Mach-O file"`. Differential Revision: https://reviews.llvm.org/D94935
118 lines
3.3 KiB
ArmAsm
118 lines
3.3 KiB
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t && split-file %s %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/test.s -o %t/test.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/libfoo.s -o %t/libfoo.o
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# RUN: %lld -dylib %t/libfoo.o -o %t/libfoo.dylib
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# RUN: %lld -lSystem %t/test.o %t/libfoo.dylib -o %t/test
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# RUN: llvm-readobj --syms --macho-dysymtab %t/test | FileCheck %s
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# CHECK: Symbols [
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: _local
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# CHECK-NEXT: Type: Section (0xE)
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# CHECK-NEXT: Section: __data
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x1{{[0-9a-f]*}}
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# CHECK-NEXT: }
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: __dyld_private
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# CHECK-NEXT: Type: Section (0xE)
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# CHECK-NEXT: Section: __data
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x1{{[0-9a-f]*}}
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# CHECK-NEXT: }
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: _main
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# CHECK-NEXT: Extern
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# CHECK-NEXT: Type: Section (0xE)
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# CHECK-NEXT: Section: __text (0x1)
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x1{{[0-9a-f]*}}
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# CHECK-NEXT: }
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: _external
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# CHECK-NEXT: Extern
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# CHECK-NEXT: Type: Section (0xE)
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# CHECK-NEXT: Section: __data
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x1{{[0-9a-f]*}}
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# CHECK-NEXT: }
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: _external_weak
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# CHECK-NEXT: Extern
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# CHECK-NEXT: Type: Section (0xE)
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# CHECK-NEXT: Section: __text (0x1)
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x80)
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# CHECK-NEXT: WeakDef (0x80)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x1{{[0-9a-f]*}}
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# CHECK-NEXT: }
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: dyld_stub_binder
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# CHECK-NEXT: Extern
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# CHECK-NEXT: Type: Undef (0x0)
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# CHECK-NEXT: Section: (0x0)
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x100)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Symbol {
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# CHECK-NEXT: Name: _dynamic
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# CHECK-NEXT: Extern
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# CHECK-NEXT: Type: Undef (0x0)
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# CHECK-NEXT: Section: (0x0)
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# CHECK-NEXT: RefType: UndefinedNonLazy (0x0)
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# CHECK-NEXT: Flags [ (0x200)
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# CHECK-NEXT: AltEntry (0x200)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Value: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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# CHECK-NEXT: Dysymtab {
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# CHECK-NEXT: ilocalsym: 0
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# CHECK-NEXT: nlocalsym: 2
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# CHECK-NEXT: iextdefsym: 2
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# CHECK-NEXT: nextdefsym: 3
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# CHECK-NEXT: iundefsym: 5
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# CHECK-NEXT: nundefsym: 2
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## Verify that the first entry in the StringTable is a space, and that
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## unreferenced symbols aren't emitted.
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# RUN: obj2yaml %t/test | FileCheck %s --check-prefix=YAML
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# YAML: StringTable:
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# YAML-NEXT: ' '
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# YAML-NOT: _unreferenced
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#--- libfoo.s
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.globl _dynamic
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_dynamic:
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#--- test.s
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.globl _main, _external, _external_weak, _unreferenced
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.data
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_external:
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.space 0
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_local:
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.space 0
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.text
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.weak_definition _external_weak
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_external_weak:
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.space 0
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_main:
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callq _dynamic
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mov $0, %rax
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ret
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