0d30e92f59
This commit adds support for chained fixups, which were introduced in Apple's late 2020 OS releases. This format replaces the dyld opcodes used for supplying rebase and binding information, and encodes most of that data directly in the memory location that will have the fixup applied. This reduces binary size and is a requirement for page-in linking, which will be available starting with macOS 13. A high-level overview of the format and my implementation can be found in SyntheticSections.h. This feature is currently gated behind the `-fixup_chains` flag, and will be enabled by default for supported targets in a later commit. Like in ld64, lazy binding is disabled when chained fixups are in use, and the `-init_offsets` transformation is performed by default. Differential Revision: https://reviews.llvm.org/D132560
133 lines
6.5 KiB
ArmAsm
133 lines
6.5 KiB
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t; split-file %s %t
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## With -flat_namespace, non-weak extern symbols in dylibs become interposable.
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## Check that we generate the correct bindings for them. The test also includes
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## other symbol types like weak externs to verify we continue to do the same
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## (correct) thing even when `-flat_namespace` is enabled, instead of generating
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## spurious bindings.
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# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos -o %t/foo.o %t/foo.s
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# RUN: %lld -lSystem -flat_namespace -o %t/foo %t/foo.o
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# RUN: %lld -lSystem -flat_namespace -fixup_chains -o %t/chained %t/foo.o
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# RUN: %lld -lSystem -dylib -flat_namespace -o %t/foo.dylib %t/foo.o
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# RUN: %lld -lSystem -dylib -flat_namespace -fixup_chains -o %t/chained.dylib %t/foo.o
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# RUN: %lld -lSystem -bundle -flat_namespace -o %t/foo.bundle %t/foo.o
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# RUN: %lld -lSystem -bundle -flat_namespace -fixup_chains -o %t/chained.bundle %t/foo.o
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# RUN: llvm-objdump --macho --syms --rebase --bind --lazy-bind --weak-bind %t/foo | \
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# RUN: FileCheck %s --check-prefixes=SYMS,EXEC --implicit-check-not=_private_extern
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# RUN: llvm-objdump --macho --syms %t/chained >> %t/chained.objdump
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# RUN: llvm-objdump --macho --dyld-info %t/chained >> %t/chained.objdump
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# RUN: FileCheck %s --check-prefixes=SYMS,CHAINED-EXEC < %t/chained.objdump
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# RUN: llvm-objdump --macho --syms %t/chained.dylib >> %t/dylib.objdump
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# RUN: llvm-objdump --macho --dyld-info %t/chained.dylib >> %t/dylib.objdump
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# RUN: FileCheck %s --check-prefixes=SYMS,CHAINED-DYLIB < %t/dylib.objdump
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# RUN: llvm-objdump --macho --syms %t/chained.bundle >> %t/bundle.objdump
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# RUN: llvm-objdump --macho --dyld-info %t/chained.bundle >> %t/bundle.objdump
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# RUN: FileCheck %s --check-prefixes=SYMS,CHAINED-DYLIB < %t/bundle.objdump
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# SYMS: SYMBOL TABLE:
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# SYMS-DAG: [[#%x, EXTERN_REF:]] l O __DATA,__data _extern_ref
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# SYMS-DAG: [[#%x, LOCAL_REF:]] l O __DATA,__data _local_ref
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# SYMS-DAG: [[#%x, WEAK_REF:]] l O __DATA,__data _weak_ref
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# SYMS-DAG: [[#%x, TLV_REF:]] g O __DATA,__thread_vars _tlv
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## Executables with -flat_namespace don't have interposable externs.
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# EXEC: Rebase table:
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# EXEC-NEXT: segment section address type
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# EXEC-DAG: __DATA __la_symbol_ptr 0x[[#%X, WEAK_LAZY:]] pointer
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# EXEC-DAG: __DATA __data 0x[[#%.8X, EXTERN_REF]] pointer
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# EXEC-DAG: __DATA __data 0x[[#%.8X, LOCAL_REF]] pointer
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# EXEC-DAG: __DATA __data 0x[[#%.8X, WEAK_REF]] pointer
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# EXEC-EMPTY:
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# EXEC-NEXT: Bind table:
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# EXEC-NEXT: segment section address type addend dylib symbol
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# EXEC-EMPTY:
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# EXEC-NEXT: Lazy bind table:
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# EXEC-NEXT: segment section address dylib symbol
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# EXEC-EMPTY:
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# EXEC-NEXT: Weak bind table:
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# EXEC-NEXT: segment section address type addend symbol
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# EXEC-NEXT: __DATA __la_symbol_ptr 0x[[#%.8X, WEAK_LAZY]] pointer 0 _weak_extern
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# EXEC-NEXT: __DATA __data 0x[[#%.8X, WEAK_REF]] pointer 0 _weak_extern
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# EXEC-EMPTY:
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# CHAINED-EXEC: dyld information:
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# CHAINED-EXEC-NEXT: segment section address pointer type addend dylib symbol/vm address
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# CHAINED-EXEC-DAG: __DATA_CONST __got {{.*}} {{.*}} bind 0x0 weak _weak_extern
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# CHAINED-EXEC-DAG: __DATA __data 0x[[#%x, EXTERN_REF]] {{.*}} rebase {{.*}}
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# CHAINED-EXEC-DAG: __DATA __data 0x[[#%x, WEAK_REF]] {{.*}} bind 0x0 weak _weak_extern
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# CHAINED-EXEC-DAG: __DATA __data 0x[[#%x, LOCAL_REF]] {{.*}} rebase {{.*}}
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# CHAINED-EXEC-EMPTY:
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# DYLIB: Rebase table:
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# DYLIB-NEXT: segment section address type
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# DYLIB-DAG: __DATA __la_symbol_ptr 0x[[#%X, WEAK_LAZY:]] pointer
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# DYLIB-DAG: __DATA __la_symbol_ptr 0x[[#%X, EXTERN_LAZY:]] pointer
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# DYLIB-DAG: __DATA __data 0x[[#%.8X, EXTERN_REF]] pointer
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# DYLIB-DAG: __DATA __data 0x[[#%.8X, LOCAL_REF]] pointer
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# DYLIB-DAG: __DATA __data 0x[[#%.8X, WEAK_REF]] pointer
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# DYLIB-DAG: __DATA __thread_ptrs 0x[[#%.8X, TLV_REF]] pointer
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# DYLIB-EMPTY:
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# DYLIB-NEXT: Bind table:
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# DYLIB-NEXT: segment section address type addend dylib symbol
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# DYLIB-DAG: __DATA_CONST __got {{.*}} pointer 0 flat-namespace dyld_stub_binder
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# DYLIB-DAG: __DATA __data 0x[[#%.8X, EXTERN_REF]] pointer 0 flat-namespace _extern
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# DYLIB-DAG: __DATA __thread_ptrs 0x[[#%.8X, TLV_REF]] pointer 0 flat-namespace _tlv
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# DYLIB-EMPTY:
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# DYLIB-NEXT: Lazy bind table:
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# DYLIB-NEXT: segment section address dylib symbol
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# DYLIB-NEXT: __DATA __la_symbol_ptr 0x[[#%.8X, EXTERN_LAZY]] flat-namespace _extern
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# DYLIB-EMPTY:
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# DYLIB-NEXT: Weak bind table:
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# DYLIB-NEXT: segment section address type addend symbol
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# DYLIB-NEXT: __DATA __la_symbol_ptr 0x[[#%.8X, WEAK_LAZY]] pointer 0 _weak_extern
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# DYLIB-NEXT: __DATA __data 0x[[#%.8X, WEAK_REF]] pointer 0 _weak_extern
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# DYLIB-EMPTY:
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# CHAINED-DYLIB: dyld information:
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# CHAINED-DYLIB-NEXT: segment section address pointer type addend dylib symbol/vm address
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# CHAINED-DYLIB-DAG: __DATA_CONST __got {{.*}} {{.*}} bind 0x0 weak _weak_extern
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# CHAINED-DYLIB-DAG: __DATA_CONST __got {{.*}} {{.*}} bind 0x0 flat-namespace _extern
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# CHAINED-DYLIB-DAG: __DATA __data 0x[[#%x, EXTERN_REF]] {{.*}} bind 0x0 flat-namespace _extern
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# CHAINED-DYLIB-DAG: __DATA __data 0x[[#%x, WEAK_REF]] {{.*}} bind 0x0 weak _weak_extern
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# CHAINED-DYLIB-DAG: __DATA __data 0x[[#%x, LOCAL_REF]] {{.*}} rebase {{.*}}
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# CHAINED-DYLIB-DAG: __DATA __thread_ptrs 0x[[#%x, TLV_REF]] {{.*}} bind 0x0 flat-namespace _tlv
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# CHAINED-DYLIB-EMPTY:
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#--- foo.s
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.globl _main, _extern, _weak_extern, _tlv
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.weak_definition _weak_extern
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.private_extern _private_extern
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_extern:
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retq
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_weak_extern:
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retq
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_private_extern:
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retq
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_local:
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retq
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_main:
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callq _extern
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callq _weak_extern
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callq _private_extern
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callq _local
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mov _tlv@TLVP(%rip), %rax
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retq
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.data
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_extern_ref:
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.quad _extern
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_weak_ref:
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.quad _weak_extern
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_local_ref:
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.quad _local
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.section __DATA,__thread_vars,thread_local_variables
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_tlv:
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.subsections_via_symbols
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