[lld] r328777 - [ELF] Fix X86 & X86_64 PLT retpoline padding
Andrew Ng via llvm-commits
llvm-commits at lists.llvm.org
Thu Mar 29 07:03:01 PDT 2018
Author: anng
Date: Thu Mar 29 07:03:01 2018
New Revision: 328777
URL: http://llvm.org/viewvc/llvm-project?rev=328777&view=rev
Log:
[ELF] Fix X86 & X86_64 PLT retpoline padding
The PLT retpoline support for X86 and X86_64 did not include the padding
when writing the header and entries. This issue was revealed when linker
scripts were used, as this disables the built-in behaviour of filling
the last page of executable segments with trap instructions. This
particular behaviour was hiding the missing padding.
Added retpoline tests with linker scripts.
Differential Revision: https://reviews.llvm.org/D44682
Added:
lld/trunk/test/ELF/i386-retpoline-nopic-linkerscript.s
lld/trunk/test/ELF/i386-retpoline-pic-linkerscript.s
lld/trunk/test/ELF/x86-64-retpoline-linkerscript.s
lld/trunk/test/ELF/x86-64-retpoline-znow-linkerscript.s
Modified:
lld/trunk/ELF/Arch/X86.cpp
lld/trunk/ELF/Arch/X86_64.cpp
Modified: lld/trunk/ELF/Arch/X86.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Arch/X86.cpp?rev=328777&r1=328776&r2=328777&view=diff
==============================================================================
--- lld/trunk/ELF/Arch/X86.cpp (original)
+++ lld/trunk/ELF/Arch/X86.cpp Thu Mar 29 07:03:01 2018
@@ -443,6 +443,7 @@ void RetpolinePic::writePltHeader(uint8_
0x89, 0xc8, // 2b: mov %ecx, %eax
0x59, // 2d: pop %ecx
0xc3, // 2e: ret
+ 0xcc, // 2f: int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
@@ -456,12 +457,13 @@ void RetpolinePic::writePlt(uint8_t *Buf
uint64_t PltEntryAddr, int32_t Index,
unsigned RelOff) const {
const uint8_t Insn[] = {
- 0x50, // pushl %eax
- 0x8b, 0x83, 0, 0, 0, 0, // mov foo at GOT(%ebx), %eax
- 0xe8, 0, 0, 0, 0, // call plt+0x20
- 0xe9, 0, 0, 0, 0, // jmp plt+0x12
- 0x68, 0, 0, 0, 0, // pushl $reloc_offset
- 0xe9, 0, 0, 0, 0, // jmp plt+0
+ 0x50, // pushl %eax
+ 0x8b, 0x83, 0, 0, 0, 0, // mov foo at GOT(%ebx), %eax
+ 0xe8, 0, 0, 0, 0, // call plt+0x20
+ 0xe9, 0, 0, 0, 0, // jmp plt+0x12
+ 0x68, 0, 0, 0, 0, // pushl $reloc_offset
+ 0xe9, 0, 0, 0, 0, // jmp plt+0
+ 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
@@ -484,7 +486,7 @@ void RetpolineNoPic::writeGotPlt(uint8_t
}
void RetpolineNoPic::writePltHeader(uint8_t *Buf) const {
- const uint8_t PltData[] = {
+ const uint8_t Insn[] = {
0xff, 0x35, 0, 0, 0, 0, // 0: pushl GOTPLT+4
0x50, // 6: pushl %eax
0xa1, 0, 0, 0, 0, // 7: mov GOTPLT+8, %eax
@@ -500,8 +502,9 @@ void RetpolineNoPic::writePltHeader(uint
0x89, 0xc8, // 2b: mov %ecx, %eax
0x59, // 2d: pop %ecx
0xc3, // 2e: ret
+ 0xcc, // 2f: int3; padding
};
- memcpy(Buf, PltData, sizeof(PltData));
+ memcpy(Buf, Insn, sizeof(Insn));
uint32_t GotPlt = InX::GotPlt->getVA();
write32le(Buf + 2, GotPlt + 4);
@@ -512,12 +515,14 @@ void RetpolineNoPic::writePlt(uint8_t *B
uint64_t PltEntryAddr, int32_t Index,
unsigned RelOff) const {
const uint8_t Insn[] = {
- 0x50, // 0: pushl %eax
- 0xa1, 0, 0, 0, 0, // 1: mov foo_in_GOT, %eax
- 0xe8, 0, 0, 0, 0, // 6: call plt+0x20
- 0xe9, 0, 0, 0, 0, // b: jmp plt+0x11
- 0x68, 0, 0, 0, 0, // 10: pushl $reloc_offset
- 0xe9, 0, 0, 0, 0, // 15: jmp plt+0
+ 0x50, // 0: pushl %eax
+ 0xa1, 0, 0, 0, 0, // 1: mov foo_in_GOT, %eax
+ 0xe8, 0, 0, 0, 0, // 6: call plt+0x20
+ 0xe9, 0, 0, 0, 0, // b: jmp plt+0x11
+ 0x68, 0, 0, 0, 0, // 10: pushl $reloc_offset
+ 0xe9, 0, 0, 0, 0, // 15: jmp plt+0
+ 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // 1a: int3; padding
+ 0xcc, // 1f: int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
Modified: lld/trunk/ELF/Arch/X86_64.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Arch/X86_64.cpp?rev=328777&r1=328776&r2=328777&view=diff
==============================================================================
--- lld/trunk/ELF/Arch/X86_64.cpp (original)
+++ lld/trunk/ELF/Arch/X86_64.cpp Thu Mar 29 07:03:01 2018
@@ -500,6 +500,8 @@ template <class ELFT> void Retpoline<ELF
0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // 19: int3; .align 16
0x4c, 0x89, 0x1c, 0x24, // 20: next: mov %r11, (%rsp)
0xc3, // 24: ret
+ 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // 25: int3; padding
+ 0xcc, 0xcc, 0xcc, 0xcc, // 2c: int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
@@ -515,10 +517,11 @@ void Retpoline<ELFT>::writePlt(uint8_t *
unsigned RelOff) const {
const uint8_t Insn[] = {
0x4c, 0x8b, 0x1d, 0, 0, 0, 0, // 0: mov foo at GOTPLT(%rip), %r11
- 0xe8, 0, 0, 0, 0, // 7: callq plt+0x20
- 0xe9, 0, 0, 0, 0, // c: jmp plt+0x12
- 0x68, 0, 0, 0, 0, // 11: pushq <relocation index>
- 0xe9, 0, 0, 0, 0, // 16: jmp plt+0
+ 0xe8, 0, 0, 0, 0, // 7: callq plt+0x20
+ 0xe9, 0, 0, 0, 0, // c: jmp plt+0x12
+ 0x68, 0, 0, 0, 0, // 11: pushq <relocation index>
+ 0xe9, 0, 0, 0, 0, // 16: jmp plt+0
+ 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // 1b: int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
@@ -546,6 +549,9 @@ void RetpolineZNow<ELFT>::writePltHeader
0xcc, 0xcc, 0xcc, 0xcc, // c: int3; .align 16
0x4c, 0x89, 0x1c, 0x24, // 10: next: mov %r11, (%rsp)
0xc3, // 14: ret
+ 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // 15: int3; padding
+ 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, // 1a: int3; padding
+ 0xcc, // 1f: int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
}
@@ -555,8 +561,9 @@ void RetpolineZNow<ELFT>::writePlt(uint8
uint64_t PltEntryAddr, int32_t Index,
unsigned RelOff) const {
const uint8_t Insn[] = {
- 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, // mov foo at GOTPLT(%rip), %r11
- 0xe9, 0, 0, 0, 0, // jmp plt+0
+ 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, // mov foo at GOTPLT(%rip), %r11
+ 0xe9, 0, 0, 0, 0, // jmp plt+0
+ 0xcc, 0xcc, 0xcc, 0xcc, // int3; padding
};
memcpy(Buf, Insn, sizeof(Insn));
Added: lld/trunk/test/ELF/i386-retpoline-nopic-linkerscript.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/i386-retpoline-nopic-linkerscript.s?rev=328777&view=auto
==============================================================================
--- lld/trunk/test/ELF/i386-retpoline-nopic-linkerscript.s (added)
+++ lld/trunk/test/ELF/i386-retpoline-nopic-linkerscript.s Thu Mar 29 07:03:01 2018
@@ -0,0 +1,67 @@
+// REQUIRES: x86
+// RUN: llvm-mc -filetype=obj -triple=i386-unknown-linux %s -o %t1.o
+// RUN: llvm-mc -filetype=obj -triple=i386-unknown-linux %p/Inputs/shared.s -o %t2.o
+// RUN: ld.lld -shared %t2.o -o %t2.so
+
+// RUN: echo "SECTIONS { \
+// RUN: .text : { *(.text) } \
+// RUN: .plt : { *(.plt) } \
+// RUN: .got.plt : { *(.got.plt) } \
+// RUN: .dynstr : { *(.dynstr) } \
+// RUN: }" > %t.script
+// RUN: ld.lld %t1.o %t2.so -o %t.exe -z retpolineplt --script %t.script
+// RUN: llvm-objdump -d -s %t.exe | FileCheck %s
+
+// CHECK: Disassembly of section .plt:
+// CHECK-NEXT: .plt:
+// CHECK-NEXT: 10: ff 35 fc 00 00 00 pushl 252
+// CHECK-NEXT: 16: 50 pushl %eax
+// CHECK-NEXT: 17: a1 00 01 00 00 movl 256, %eax
+// CHECK-NEXT: 1c: e8 0f 00 00 00 calll 15 <.plt+0x20>
+// CHECK-NEXT: 21: f3 90 pause
+// CHECK-NEXT: 23: 0f ae e8 lfence
+// CHECK-NEXT: 26: eb f9 jmp -7 <.plt+0x11>
+// CHECK-NEXT: 28: cc int3
+// CHECK-NEXT: 29: cc int3
+// CHECK-NEXT: 2a: cc int3
+// CHECK-NEXT: 2b: cc int3
+// CHECK-NEXT: 2c: cc int3
+// CHECK-NEXT: 2d: cc int3
+// CHECK-NEXT: 2e: cc int3
+// CHECK-NEXT: 2f: cc int3
+// CHECK-NEXT: 30: 89 0c 24 movl %ecx, (%esp)
+// CHECK-NEXT: 33: 8b 4c 24 04 movl 4(%esp), %ecx
+// CHECK-NEXT: 37: 89 44 24 04 movl %eax, 4(%esp)
+// CHECK-NEXT: 3b: 89 c8 movl %ecx, %eax
+// CHECK-NEXT: 3d: 59 popl %ecx
+// CHECK-NEXT: 3e: c3 retl
+// CHECK-NEXT: 3f: cc int3
+// CHECK-NEXT: 40: 50 pushl %eax
+// CHECK-NEXT: 41: a1 04 01 00 00 movl 260, %eax
+// CHECK-NEXT: 46: e8 e5 ff ff ff calll -27 <.plt+0x20>
+// CHECK-NEXT: 4b: e9 d1 ff ff ff jmp -47 <.plt+0x11>
+// CHECK-NEXT: 50: 68 00 00 00 00 pushl $0
+// CHECK-NEXT: 55: e9 b6 ff ff ff jmp -74 <.plt>
+// CHECK-NEXT: 5a: cc int3
+// CHECK-NEXT: 5b: cc int3
+// CHECK-NEXT: 5c: cc int3
+// CHECK-NEXT: 5d: cc int3
+// CHECK-NEXT: 5e: cc int3
+// CHECK-NEXT: 5f: cc int3
+// CHECK-NEXT: 60: 50 pushl %eax
+// CHECK-NEXT: 61: a1 08 01 00 00 movl 264, %eax
+// CHECK-NEXT: 66: e8 c5 ff ff ff calll -59 <.plt+0x20>
+// CHECK-NEXT: 6b: e9 b1 ff ff ff jmp -79 <.plt+0x11>
+// CHECK-NEXT: 70: 68 08 00 00 00 pushl $8
+// CHECK-NEXT: 75: e9 96 ff ff ff jmp -106 <.plt>
+// CHECK-NEXT: 7a: cc int3
+// CHECK-NEXT: 7b: cc int3
+// CHECK-NEXT: 7c: cc int3
+// CHECK-NEXT: 7d: cc int3
+// CHECK-NEXT: 7e: cc int3
+// CHECK-NEXT: 7f: cc int3
+
+.global _start
+_start:
+ jmp bar at PLT
+ jmp zed at PLT
Added: lld/trunk/test/ELF/i386-retpoline-pic-linkerscript.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/i386-retpoline-pic-linkerscript.s?rev=328777&view=auto
==============================================================================
--- lld/trunk/test/ELF/i386-retpoline-pic-linkerscript.s (added)
+++ lld/trunk/test/ELF/i386-retpoline-pic-linkerscript.s Thu Mar 29 07:03:01 2018
@@ -0,0 +1,64 @@
+// REQUIRES: x86
+// RUN: llvm-mc -filetype=obj -triple=i386-unknown-linux -position-independent %s -o %t1.o
+// RUN: llvm-mc -filetype=obj -triple=i386-unknown-linux -position-independent %p/Inputs/shared.s -o %t2.o
+// RUN: ld.lld -shared %t2.o -o %t2.so
+
+// RUN: echo "SECTIONS { \
+// RUN: .text : { *(.text) } \
+// RUN: .plt : { *(.plt) } \
+// RUN: .got.plt : { *(.got.plt) } \
+// RUN: .dynstr : { *(.dynstr) } \
+// RUN: }" > %t.script
+// RUN: ld.lld %t1.o %t2.so -o %t.exe -z retpolineplt -pie --script %t.script
+// RUN: llvm-objdump -d -s %t.exe | FileCheck %s
+
+// CHECK: Disassembly of section .plt:
+// CHECK-NEXT: .plt:
+// CHECK-NEXT: 10: ff b3 fc 00 00 00 pushl 252(%ebx)
+// CHECK-NEXT: 16: 50 pushl %eax
+// CHECK-NEXT: 17: 8b 83 00 01 00 00 movl 256(%ebx), %eax
+// CHECK-NEXT: 1d: e8 0e 00 00 00 calll 14 <.plt+0x20>
+// CHECK-NEXT: 22: f3 90 pause
+// CHECK-NEXT: 24: 0f ae e8 lfence
+// CHECK-NEXT: 27: eb f9 jmp -7 <.plt+0x12>
+// CHECK-NEXT: 29: cc int3
+// CHECK-NEXT: 2a: cc int3
+// CHECK-NEXT: 2b: cc int3
+// CHECK-NEXT: 2c: cc int3
+// CHECK-NEXT: 2d: cc int3
+// CHECK-NEXT: 2e: cc int3
+// CHECK-NEXT: 2f: cc int3
+// CHECK-NEXT: 30: 89 0c 24 movl %ecx, (%esp)
+// CHECK-NEXT: 33: 8b 4c 24 04 movl 4(%esp), %ecx
+// CHECK-NEXT: 37: 89 44 24 04 movl %eax, 4(%esp)
+// CHECK-NEXT: 3b: 89 c8 movl %ecx, %eax
+// CHECK-NEXT: 3d: 59 popl %ecx
+// CHECK-NEXT: 3e: c3 retl
+// CHECK-NEXT: 3f: cc int3
+// CHECK-NEXT: 40: 50 pushl %eax
+// CHECK-NEXT: 41: 8b 83 04 01 00 00 movl 260(%ebx), %eax
+// CHECK-NEXT: 47: e8 e4 ff ff ff calll -28 <.plt+0x20>
+// CHECK-NEXT: 4c: e9 d1 ff ff ff jmp -47 <.plt+0x12>
+// CHECK-NEXT: 51: 68 00 00 00 00 pushl $0
+// CHECK-NEXT: 56: e9 b5 ff ff ff jmp -75 <.plt>
+// CHECK-NEXT: 5b: cc int3
+// CHECK-NEXT: 5c: cc int3
+// CHECK-NEXT: 5d: cc int3
+// CHECK-NEXT: 5e: cc int3
+// CHECK-NEXT: 5f: cc int3
+// CHECK-NEXT: 60: 50 pushl %eax
+// CHECK-NEXT: 61: 8b 83 08 01 00 00 movl 264(%ebx), %eax
+// CHECK-NEXT: 67: e8 c4 ff ff ff calll -60 <.plt+0x20>
+// CHECK-NEXT: 6c: e9 b1 ff ff ff jmp -79 <.plt+0x12>
+// CHECK-NEXT: 71: 68 08 00 00 00 pushl $8
+// CHECK-NEXT: 76: e9 95 ff ff ff jmp -107 <.plt>
+// CHECK-NEXT: 7b: cc int3
+// CHECK-NEXT: 7c: cc int3
+// CHECK-NEXT: 7d: cc int3
+// CHECK-NEXT: 7e: cc int3
+// CHECK-NEXT: 7f: cc int3
+
+.global _start
+_start:
+ jmp bar at PLT
+ jmp zed at PLT
Added: lld/trunk/test/ELF/x86-64-retpoline-linkerscript.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/x86-64-retpoline-linkerscript.s?rev=328777&view=auto
==============================================================================
--- lld/trunk/test/ELF/x86-64-retpoline-linkerscript.s (added)
+++ lld/trunk/test/ELF/x86-64-retpoline-linkerscript.s Thu Mar 29 07:03:01 2018
@@ -0,0 +1,67 @@
+// REQUIRES: x86
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t1.o
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/shared.s -o %t2.o
+// RUN: ld.lld -shared %t2.o -o %t2.so
+
+// RUN: echo "SECTIONS { \
+// RUN: .text : { *(.text) } \
+// RUN: .plt : { *(.plt) } \
+// RUN: .got.plt : { *(.got.plt) } \
+// RUN: .dynstr : { *(.dynstr) } \
+// RUN: }" > %t.script
+// RUN: ld.lld -shared %t1.o %t2.so -o %t.exe -z retpolineplt --script %t.script
+// RUN: llvm-objdump -d -s %t.exe | FileCheck %s
+
+// CHECK: Disassembly of section .plt:
+// CHECK-NEXT: .plt:
+// CHECK-NEXT: 10: ff 35 4a 01 00 00 pushq 330(%rip)
+// CHECK-NEXT: 16: 4c 8b 1d 4b 01 00 00 movq 331(%rip), %r11
+// CHECK-NEXT: 1d: e8 0e 00 00 00 callq 14 <.plt+0x20>
+// CHECK-NEXT: 22: f3 90 pause
+// CHECK-NEXT: 24: 0f ae e8 lfence
+// CHECK-NEXT: 27: eb f9 jmp -7 <.plt+0x12>
+// CHECK-NEXT: 29: cc int3
+// CHECK-NEXT: 2a: cc int3
+// CHECK-NEXT: 2b: cc int3
+// CHECK-NEXT: 2c: cc int3
+// CHECK-NEXT: 2d: cc int3
+// CHECK-NEXT: 2e: cc int3
+// CHECK-NEXT: 2f: cc int3
+// CHECK-NEXT: 30: 4c 89 1c 24 movq %r11, (%rsp)
+// CHECK-NEXT: 34: c3 retq
+// CHECK-NEXT: 35: cc int3
+// CHECK-NEXT: 36: cc int3
+// CHECK-NEXT: 37: cc int3
+// CHECK-NEXT: 38: cc int3
+// CHECK-NEXT: 39: cc int3
+// CHECK-NEXT: 3a: cc int3
+// CHECK-NEXT: 3b: cc int3
+// CHECK-NEXT: 3c: cc int3
+// CHECK-NEXT: 3d: cc int3
+// CHECK-NEXT: 3e: cc int3
+// CHECK-NEXT: 3f: cc int3
+// CHECK-NEXT: 40: 4c 8b 1d 29 01 00 00 movq 297(%rip), %r11
+// CHECK-NEXT: 47: e8 e4 ff ff ff callq -28 <.plt+0x20>
+// CHECK-NEXT: 4c: e9 d1 ff ff ff jmp -47 <.plt+0x12>
+// CHECK-NEXT: 51: 68 00 00 00 00 pushq $0
+// CHECK-NEXT: 56: e9 b5 ff ff ff jmp -75 <.plt>
+// CHECK-NEXT: 5b: cc int3
+// CHECK-NEXT: 5c: cc int3
+// CHECK-NEXT: 5d: cc int3
+// CHECK-NEXT: 5e: cc int3
+// CHECK-NEXT: 5f: cc int3
+// CHECK-NEXT: 60: 4c 8b 1d 11 01 00 00 movq 273(%rip), %r11
+// CHECK-NEXT: 67: e8 c4 ff ff ff callq -60 <.plt+0x20>
+// CHECK-NEXT: 6c: e9 b1 ff ff ff jmp -79 <.plt+0x12>
+// CHECK-NEXT: 71: 68 01 00 00 00 pushq $1
+// CHECK-NEXT: 76: e9 95 ff ff ff jmp -107 <.plt>
+// CHECK-NEXT: 7b: cc int3
+// CHECK-NEXT: 7c: cc int3
+// CHECK-NEXT: 7d: cc int3
+// CHECK-NEXT: 7e: cc int3
+// CHECK-NEXT: 7f: cc int3
+
+.global _start
+_start:
+ jmp bar at PLT
+ jmp zed at PLT
Added: lld/trunk/test/ELF/x86-64-retpoline-znow-linkerscript.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/x86-64-retpoline-znow-linkerscript.s?rev=328777&view=auto
==============================================================================
--- lld/trunk/test/ELF/x86-64-retpoline-znow-linkerscript.s (added)
+++ lld/trunk/test/ELF/x86-64-retpoline-znow-linkerscript.s Thu Mar 29 07:03:01 2018
@@ -0,0 +1,54 @@
+// REQUIRES: x86
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t1.o
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/shared.s -o %t2.o
+// RUN: ld.lld -shared %t2.o -o %t2.so
+
+// RUN: echo "SECTIONS { \
+// RUN: .text : { *(.text) } \
+// RUN: .plt : { *(.plt) } \
+// RUN: .got.plt : { *(.got.plt) } \
+// RUN: .dynstr : { *(.dynstr) } \
+// RUN: }" > %t.script
+// RUN: ld.lld -shared %t1.o %t2.so -o %t.exe -z retpolineplt -z now --script %t.script
+// RUN: llvm-objdump -d -s %t.exe | FileCheck %s
+
+// CHECK: Disassembly of section .plt:
+// CHECK-NEXT: .plt:
+// CHECK-NEXT: 10: e8 0b 00 00 00 callq 11 <.plt+0x10>
+// CHECK-NEXT: 15: f3 90 pause
+// CHECK-NEXT: 17: 0f ae e8 lfence
+// CHECK-NEXT: 1a: eb f9 jmp -7 <.plt+0x5>
+// CHECK-NEXT: 1c: cc int3
+// CHECK-NEXT: 1d: cc int3
+// CHECK-NEXT: 1e: cc int3
+// CHECK-NEXT: 1f: cc int3
+// CHECK-NEXT: 20: 4c 89 1c 24 movq %r11, (%rsp)
+// CHECK-NEXT: 24: c3 retq
+// CHECK-NEXT: 25: cc int3
+// CHECK-NEXT: 26: cc int3
+// CHECK-NEXT: 27: cc int3
+// CHECK-NEXT: 28: cc int3
+// CHECK-NEXT: 29: cc int3
+// CHECK-NEXT: 2a: cc int3
+// CHECK-NEXT: 2b: cc int3
+// CHECK-NEXT: 2c: cc int3
+// CHECK-NEXT: 2d: cc int3
+// CHECK-NEXT: 2e: cc int3
+// CHECK-NEXT: 2f: cc int3
+// CHECK-NEXT: 30: 4c 8b 1d 09 01 00 00 movq 265(%rip), %r11
+// CHECK-NEXT: 37: e9 d4 ff ff ff jmp -44 <.plt>
+// CHECK-NEXT: 3c: cc int3
+// CHECK-NEXT: 3d: cc int3
+// CHECK-NEXT: 3e: cc int3
+// CHECK-NEXT: 3f: cc int3
+// CHECK-NEXT: 40: 4c 8b 1d 01 01 00 00 movq 257(%rip), %r11
+// CHECK-NEXT: 47: e9 c4 ff ff ff jmp -60 <.plt>
+// CHECK-NEXT: 4c: cc int3
+// CHECK-NEXT: 4d: cc int3
+// CHECK-NEXT: 4e: cc int3
+// CHECK-NEXT: 4f: cc int3
+
+.global _start
+_start:
+ jmp bar at PLT
+ jmp zed at PLT
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