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6e8a1a45a7
This makes it easier to handle differences (e.g. of exception table entry size) between versions of Linux kernel
157 lines
3.9 KiB
ArmAsm
157 lines
3.9 KiB
ArmAsm
# REQUIRES: system-linux
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## Check that BOLT correctly parses the Linux kernel .altinstructions section
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## and annotates alternative instructions.
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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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# RUN: llvm-bolt %t.exe --print-cfg --alt-inst-feature-size=2 -o %t.out \
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# RUN: | FileCheck %s
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## Older kernels used to have padlen field in alt_instr. Check compatibility.
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown --defsym PADLEN=1 \
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# RUN: %s -o %t.padlen.o
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# RUN: %clang %cflags -nostdlib %t.padlen.o -o %t.padlen.exe \
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# RUN: -Wl,--image-base=0xffffffff80000000,--no-dynamic-linker,--no-eh-frame-hdr,--no-pie
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# RUN: llvm-bolt %t.padlen.exe --print-cfg --alt-inst-has-padlen -o %t.padlen.out \
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# RUN: | FileCheck %s
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## Check with a larger size of "feature" field in alt_instr.
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
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# RUN: --defsym FEATURE_SIZE_4=1 %s -o %t.fs4.o
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# RUN: %clang %cflags -nostdlib %t.fs4.o -o %t.fs4.exe \
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# RUN: -Wl,--image-base=0xffffffff80000000,--no-dynamic-linker,--no-eh-frame-hdr,--no-pie
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# RUN: llvm-bolt %t.fs4.exe --print-cfg --alt-inst-feature-size=4 -o %t.fs4.out \
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# RUN: | FileCheck %s
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## Check that out-of-bounds read is handled properly.
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# RUN: not llvm-bolt %t.fs4.exe --alt-inst-feature-size=2 -o %t.fs4.out
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## Check that BOLT automatically detects structure fields in .altinstructions.
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# RUN: llvm-bolt %t.exe --print-cfg -o %t.out | FileCheck %s
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# RUN: llvm-bolt %t.exe --print-cfg -o %t.padlen.out | FileCheck %s
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# RUN: llvm-bolt %t.exe --print-cfg -o %t.fs4.out | FileCheck %s
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# CHECK: BOLT-INFO: Linux kernel binary detected
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# CHECK: BOLT-INFO: parsed 3 alternative instruction 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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.L0:
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rdtsc
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# CHECK: rdtsc
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# CHECK-SAME: AltInst: 1
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# CHECK-SAME: AltInst2: 2
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# CHECK-SAME: AltInst3: 3
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nop
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# CHECK-NEXT: nop
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# CHECK-SAME: AltInst: 1
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# CHECK-SAME: AltInst2: 2
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# CHECK-SAME: AltInst3: 3
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nop
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nop
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.L1:
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ret
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.size _start, .-_start
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.section .altinstr_replacement,"ax",@progbits
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.A0:
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lfence
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rdtsc
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.A1:
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rdtscp
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.A2:
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pushf
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pop %rax
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.Ae:
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## Alternative instruction info.
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.section .altinstructions,"a",@progbits
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.long .L0 - . # org instruction
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.long .A0 - . # alt instruction
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.ifdef FEATURE_SIZE_4
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.long 0x72 # feature flags
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.else
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.word 0x72 # feature flags
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.endif
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.byte .L1 - .L0 # org size
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.byte .A1 - .A0 # alt size
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.ifdef PADLEN
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.byte 0
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.endif
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.long .L0 - . # org instruction
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.long .A1 - . # alt instruction
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.ifdef FEATURE_SIZE_4
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.long 0x3b # feature flags
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.else
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.word 0x3b # feature flags
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.endif
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.byte .L1 - .L0 # org size
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.byte .A2 - .A1 # alt size
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.ifdef PADLEN
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.byte 0
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.endif
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.long .L0 - . # org instruction
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.long .A2 - . # alt instruction
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.ifdef FEATURE_SIZE_4
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.long 0x110 # feature flags
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.else
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.word 0x110 # feature flags
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.endif
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.byte .L1 - .L0 # org size
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.byte .Ae - .A2 # alt size
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.ifdef PADLEN
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.byte 0
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.endif
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## ORC unwind for "pushf; pop %rax" alternative sequence.
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.section .orc_unwind,"a",@progbits
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.align 4
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.section .orc_unwind_ip,"a",@progbits
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.align 4
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.section .orc_unwind
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.2byte 8
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.2byte 0
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.2byte 0x205
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.section .orc_unwind_ip
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.long _start - .
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.section .orc_unwind
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.2byte 16
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.2byte 0
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.2byte 0x205
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.section .orc_unwind_ip
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.long .L0 + 1 - .
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.section .orc_unwind
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.2byte 8
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.2byte 0
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.2byte 0x205
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.section .orc_unwind_ip
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.long .L0 + 2 - .
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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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