derek.holloway
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71 lines
1.7 KiB
ArmAsm
71 lines
1.7 KiB
ArmAsm
# REQUIRES: system-linux
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## Check that BOLT correctly parses and updates the Linux kernel __bug_table
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## section.
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %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,--no-pie
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## Verify bug entry bindings to instructions.
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# RUN: llvm-bolt %t.exe --print-normalized --print-only=_start -o %t.out \
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# RUN: --eliminate-unreachable=1 --bolt-info=0 | FileCheck %s
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## Verify bug entry bindings again after unreachable code elimination.
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# RUN: llvm-bolt %t.out -o %t.out.1 --print-only=_start --print-normalized \
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# RUN: 2>&1 | FileCheck --check-prefix=CHECK-REOPT %s
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# CHECK: BOLT-INFO: Linux kernel binary detected
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# CHECK: BOLT-INFO: parsed 2 bug table 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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jmp .L1
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.L0:
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ud2
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# CHECK: ud2
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# CHECK-SAME: BugEntry: 1
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.L1:
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ud2
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# CHECK: ud2
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# CHECK-SAME: BugEntry: 2
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## Only the second entry should remain after the first pass.
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# CHECK-REOPT: ud2
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# CHECK-REOPT-SAME: BugEntry: 2
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ret
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## The return instruction is reachable only via preceding ud2. Test that it is
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## treated as a reachable instruction in the Linux kernel mode.
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# CHECK-REOPT-NEXT: ret
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.size _start, .-_start
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## Bug table.
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.section __bug_table,"a",@progbits
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1:
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.long .L0 - . # instruction
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.org 1b + 12
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2:
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.long .L1 - . # instruction
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.org 2b + 12
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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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