2646dccaa3
Static calls are calls that are getting patched during runtime. Hence, for every such call the kernel runtime needs the location of the call or jmp instruction that will be patched. Instruction locations together with a corresponding key are stored in the static call site table. As BOLT rewrites these instructions it needs to update the table.
60 lines
1.4 KiB
ArmAsm
60 lines
1.4 KiB
ArmAsm
# REQUIRES: system-linux
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## Check that BOLT correctly updates the Linux kernel static calls table.
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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
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## Verify static calls 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 |& FileCheck %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 |& FileCheck %s
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# CHECK: BOLT-INFO: Linux kernel binary detected
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# CHECK: BOLT-INFO: parsed 2 static call 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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call foo
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# CHECK: callq foo # {{.*}} StaticCall: 1
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nop
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.L1:
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jmp foo
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# CHECK: jmp foo # {{.*}} StaticCall: 2
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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 call table.
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.rodata
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.globl __start_static_call_sites
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.type __start_static_call_sites, %object
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__start_static_call_sites:
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.long .L0 - .
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.long 0
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.long .L1 - .
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.long 0
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.globl __stop_static_call_sites
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.type __stop_static_call_sites, %object
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__stop_static_call_sites:
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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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