derek.holloway
7502bf64a4
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81 lines
2.5 KiB
ArmAsm
81 lines
2.5 KiB
ArmAsm
# REQUIRES: aarch64
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# RUN: rm -rf %t; mkdir %t
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# RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %s -o %t/input.o
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## When two call sites branch to the same target symbol with different addends
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## and each needs a branch-extension thunk, the thunks must be distinct.
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# RUN: %lld -arch arm64 -lSystem -o %t/base %t/input.o
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# RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/base \
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# RUN: | FileCheck %s --check-prefixes=CHECK,BASE
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## Regression test for the narrow corner case where the referent of a
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## branch relocation is a Defined symbol that *also* has a __stubs entry
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## (here forced via -interposable, which creates a stub for every extern
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## Defined so callers can be interposed at runtime).
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# RUN: %lld -arch arm64 -lSystem -interposable -o %t/interp %t/input.o
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# RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/interp \
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# RUN: | FileCheck %s --check-prefixes=CHECK,INTERP
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.subsections_via_symbols
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.text
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## _target will become an interposable extern Defined under `-interposable`: it
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## has a real body *and* a __stubs entry.
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.globl _target
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## Align it to a 4K boundary to make the test a little bit easier to write.
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.p2align 12
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_target:
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mov w0, #1
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ret
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mov w0, #2
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ret
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## Spacer to push _main out of branch range of _target.
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.globl _spacer
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.p2align 2
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_spacer:
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.space 0x8000000
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ret
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.globl _main
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.p2align 2
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_main:
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bl _target
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bl _target+8
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ret
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## Capture _target's full VA.
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# CHECK-LABEL: <_target>:
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# CHECK-NEXT: [[#%x, TARGET_VA:]]: mov w0, #1
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# BASE-LABEL: <_main>:
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# BASE-NEXT: bl 0x{{[0-9a-f]+}} <_target.thunk.0>
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# BASE-NEXT: bl 0x{{[0-9a-f]+}} <_target+8.thunk.0>
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# BASE-NEXT: ret
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## For -interposable: The addend=0 call takes the __stubs fast-path, so its bl
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## target is an address inside the __stubs section. The addend=8 call must
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## resolve against the local body.
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# INTERP-LABEL: <_main>:
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# INTERP-NEXT: bl 0x[[#%x, STUB_CALL:]]
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# INTERP-NEXT: bl 0x{{[0-9a-f]+}} <_target+8.thunk.0>
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# INTERP-NEXT: ret
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## The +0 thunk should be only present in BASE test.
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# BASE-LABEL: <_target.thunk.0>:
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# BASE-NEXT: adrp x16, 0x[[#TARGET_VA]]
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# BASE-NEXT: add x16, x16, #0
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# BASE-NEXT: br x16
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## The +8 thunk must load _target+8 into x16: adrp loads _target (which is
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## 4K-aligned), add supplies the +8.
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# CHECK-LABEL: <_target+8.thunk.0>:
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# CHECK-NEXT: adrp x16, 0x[[#TARGET_VA]]
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# CHECK-NEXT: add x16, x16, #8
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# CHECK-NEXT: br x16
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# INTERP-LABEL: <__stubs>:
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# INTERP: [[#STUB_CALL]]: adrp x16,
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