6e8a1a45a7
This makes it easier to handle differences (e.g. of exception table entry size) between versions of Linux kernel
100 lines
2.6 KiB
ArmAsm
100 lines
2.6 KiB
ArmAsm
# REQUIRES: system-linux
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## Check that BOLT correctly updates the Linux kernel static keys jump table.
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
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# RUN: link_fdata %s %t.o %t.fdata
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# RUN: llvm-strip --strip-unneeded %t.o
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# RUN: %clang %cflags -nostdlib %t.o -o %t.exe \
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# RUN: -Wl,--image-base=0xffffffff80000000,--no-dynamic-linker,--no-eh-frame-hdr
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## Verify static keys jump bindings to instructions.
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# RUN: llvm-bolt %t.exe --print-normalized -o %t.out --keep-nops=0 \
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# RUN: --bolt-info=0 2>&1 | FileCheck %s
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## Verify that profile is matched correctly.
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# RUN: llvm-bolt %t.exe --print-normalized -o %t.out --keep-nops=0 \
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# RUN: --bolt-info=0 --data %t.fdata 2>&1 \
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# RUN: | FileCheck --check-prefix=CHECK-FDATA %s
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## Verify the bindings again on the rewritten binary with nops removed.
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# RUN: llvm-bolt %t.out -o %t.out.1 --print-normalized 2>&1 | FileCheck %s
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# CHECK: BOLT-INFO: Linux kernel binary detected
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# CHECK: BOLT-INFO: parsed 2 static keys jump entries
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.text
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.globl _start
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.type _start, %function
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_start:
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# CHECK: Binary Function "_start"
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nop
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.L0:
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jmp L1
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# CHECK: jit
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# CHECK-SAME: # ID: 1 {{.*}} # Likely: 1 # InitValue: 0
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nop
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L1:
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.nops 5
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# CHECK: jit
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# CHECK-SAME: # ID: 2 {{.*}} # Likely: 0 # InitValue: 0
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jmp .L0
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## Check that a branch profile associated with a NOP is handled properly when
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## dynamic branch is created.
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# FDATA: 1 _start #L1# 1 _start #L2# 3 42
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# CHECK-FDATA: jit {{.*}} # ID: 2
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# CHECK-FDATA-NEXT: jmp
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# CHECK-FDATA-NEXT: Successors: {{.*}} (mispreds: 3, count: 42)
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L2:
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nop
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.size _start, .-_start
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.globl foo
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.type foo, %function
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foo:
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ret
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.size foo, .-foo
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## Static keys jump table.
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.rodata
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.globl __start___jump_table
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.type __start___jump_table, %object
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__start___jump_table:
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.long .L0 - . # Jump address
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.long L1 - . # Target address
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.quad fake_static_key + 1 - . # Key address; LSB = 1 : likely
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.long L1 - . # Jump address
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.long L2 - . # Target address
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.quad fake_static_key -. # Key address; LSB = 0 : unlikely
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.globl __stop___jump_table
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.type __stop___jump_table, %object
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__stop___jump_table:
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## Staic keys (we just use the label ignoring the format of the keys).
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.data
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.align 8
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fake_static_key:
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.quad 0
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## Linux kernel version
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.rodata
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.align 16
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.globl linux_banner
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.type linux_banner, @object
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linux_banner:
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.string "Linux version 6.6.61\n"
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.size linux_banner, . - linux_banner
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## Fake Linux Kernel sections.
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.section __ksymtab,"a",@progbits
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.section __ksymtab_gpl,"a",@progbits
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