derek.holloway
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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
// This test checks that LongJmp can add BTI instructions to PLT entries when
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// targeting them using stubs.
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//
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// The test uses a non-default layout, where the .plt section is placed before
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// the text section. This is needed so the new code placed under the .data
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// section is far enough from the PLt to trigger shortJmp stubs.
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//
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// In practice, the PLT section can also be placed after the original text
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// section. In this scenario, the text section has to be large enough to trigger
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// shortJmp stubs.
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// REQUIRES: system-linux
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// RUN: split-file %s %t
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// RUN: %clang --target=aarch64-unknown-linux-gnu -mbranch-protection=standard \
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// RUN: -no-pie %t/bti-plt.c -o %t.exe -Wl,-q -fuse-ld=lld \
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// RUN: -Wl,-T,%t/link.ld -Wl,-z,force-bti
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// RUN: llvm-bolt %t.exe -o %t.bolt | FileCheck %s
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// CHECK: BOLT-INFO: binary is using BTI
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// Checking PLT entries before running BOLT
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// RUN: llvm-objdump -d -j .plt %t.exe | FileCheck %s --check-prefix=CHECK-EXE
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// CHECK-EXE: <abort@plt>
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// CHECK-EXE-NEXT: adrp x16, {{0x[0-9a-f]+}}
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// CHECK-EXE-NEXT: ldr x17, [x16, #{{0x[0-9a-f]+}}]
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// CHECK-EXE-NEXT: add x16, x16, #{{0x[0-9a-f]+}}
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// CHECK-EXE-NEXT: br x17
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// CHECK-EXE-NEXT: nop
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// CHECK-EXE-NEXT: nop
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// Checking PLT entries after patching them in BOLT
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// RUN: llvm-objdump -d -j .plt %t.bolt | FileCheck %s \
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// RUN: --check-prefix=CHECK-BOLT
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// CHECK-BOLT: <abort@plt>
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// CHECK-BOLT-NEXT: bti c
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// CHECK-BOLT-NEXT: adrp x16, {{0x[0-9a-f]+}}
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// CHECK-BOLT-NEXT: ldr x17, [x16, #{{0x[0-9a-f]+}}]
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// CHECK-BOLT-NEXT: add x16, x16, #{{0x[0-9a-f]+}}
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// CHECK-BOLT-NEXT: br x17
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// CHECK-BOLT-NEXT: nop
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/*
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#--- link.ld
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SECTIONS {
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.plt : { *(.plt .plt.*) }
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} INSERT BEFORE .text;
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#--- bti-plt.c
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//*/
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#include <stdio.h>
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int main(void) {
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printf("Hello, World!\n");
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return 0;
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}
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// .data big enough so the new code placed after it has to use stubs to reach
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// PLTs:
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__asm__(".section .data\n"
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".globl space\n"
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"space:\n"
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".fill 0x8000000,1,0x0\n"
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".text\n");
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