derek.holloway
7502bf64a4
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101 lines
2.3 KiB
ArmAsm
101 lines
2.3 KiB
ArmAsm
## Check that BOLT symbolizer properly handles loads from GOT, including
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## instruction sequences changed/relaxed by the linker.
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# RUN: split-file %s %t
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %t/main.s \
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# RUN: -o %t/main.o
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %t/near.s \
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# RUN: -o %t/near.o
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %t/far.s \
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# RUN: -o %t/far.o
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# RUN: %clang %cflags %t/main.o %t/near.o %t/far.o -o %t/main.exe -Wl,-q -static
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# RUN: llvm-bolt %t/main.exe -o %t/main.bolt --keep-nops --print-disasm \
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# RUN: --print-only=_start | FileCheck %s
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#--- main.s
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.text
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.globl _start
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.p2align 2
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.type _start, @function
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# CHECK-LABEL: _start
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_start:
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## Function address load relaxable into nop+adr.
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# CHECK: nop
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# CHECK-NEXT: adr x0, near
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adrp x0, :got:near
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ldr x0, [x0, :got_lo12:near]
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## Function address load relaxable into adrp+add.
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# CHECK-NEXT: adrp x1, far
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# CHECK-NEXT: add x1, x1, :lo12:far
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adrp x1, :got:far
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ldr x1, [x1, :got_lo12:far]
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## Non-relaxable due to the instruction in-between.
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# CHECK-NEXT: adrp x2, __BOLT_got_zero
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# CHECK-NEXT: nop
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# CHECK-NEXT: ldr x2, [x2, :lo12:__BOLT_got_zero{{.*}}]
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adrp x2, :got:near
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nop
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ldr x2, [x2, :got_lo12:near]
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## Load data object with local visibility. Relaxable into adrp+add.
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# CHECK-NEXT: adrp x3, "local_far_data/1"
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# CHECK-NEXT: add x3, x3, :lo12:"local_far_data/1"
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adrp x3, :got:local_far_data
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ldr x3, [x3, :got_lo12:local_far_data]
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## Global data reference relaxable into adrp+add.
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# CHECK-NEXT: adrp x4, far_data
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# CHECK-NEXT: add x4, x4, :lo12:far_data
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adrp x4, :got:far_data
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ldr x4, [x4, :got_lo12:far_data]
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ret
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.size _start, .-_start
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.weak near
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.weak far
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.weak far_data
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## Data object separated by more than 1MB from _start.
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.data
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.type local_far_data, @object
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local_far_data:
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.xword 0
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.size local_far_data, .-local_far_data
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#--- near.s
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.text
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.globl near
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.type near, @function
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near:
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ret
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.size near, .-near
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#--- far.s
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.text
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## Insert 1MB of empty space to make objects after it unreachable by adr
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## instructions in _start.
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.space 0x100000
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.globl far
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.type far, @function
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far:
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ret
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.size far, .-far
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.data
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.globl far_data
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.type far_data, @object
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far_data:
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.xword 0
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.size far_data, .-far_data
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