| // REQUIRES: arm |
| // RUN: llvm-mc -filetype=obj --arm-add-build-attributes -triple=armv7a-none-linux-gnueabi %s -o %t |
| // RUN: ld.lld %t --no-merge-exidx-entries -o %t2 --gc-sections |
| // RUN: llvm-objdump -d --triple=armv7a-none-linux-gnueabi --no-show-raw-insn %t2 | FileCheck %s |
| // RUN: llvm-objdump -s --triple=armv7a-none-linux-gnueabi %t2 | FileCheck --check-prefix=CHECK-EXIDX %s |
| |
| /// Test the behavior of .ARM.exidx sections under garbage collection |
| /// A .ARM.exidx section is live if it has a relocation to a live executable |
| /// section. |
| /// A .ARM.exidx section may have a relocation to a .ARM.extab section, if the |
| /// .ARM.exidx is live then the .ARM.extab section is live |
| |
| .syntax unified |
| .section .text.func1, "ax",%progbits |
| .global func1 |
| func1: |
| .fnstart |
| bx lr |
| .save {r7, lr} |
| .setfp r7, sp, #0 |
| .fnend |
| |
| .section .text.unusedfunc1, "ax",%progbits |
| .global unusedfunc1 |
| unusedfunc1: |
| .fnstart |
| bx lr |
| .cantunwind |
| .fnend |
| |
| /// Unwinding instructions for .text2 too large for an inline entry ARM.exidx |
| /// entry. A separate .ARM.extab section is created to hold the unwind entries |
| /// The .ARM.exidx table entry has a reference to the .ARM.extab section. |
| .section .text.func2, "ax",%progbits |
| .global func2 |
| func2: |
| .fnstart |
| bx lr |
| .personality __gxx_personality_v0 |
| .handlerdata |
| .section .text.func2 |
| .fnend |
| |
| /// An unused function with a reference to a .ARM.extab section. Both should |
| /// be removed by gc. |
| .section .text.unusedfunc2, "ax",%progbits |
| .global unusedfunc2 |
| unusedfunc2: |
| .fnstart |
| bx lr |
| .personality __gxx_personality_v1 |
| .handlerdata |
| .section .text.unusedfunc2 |
| .fnend |
| |
| /// Dummy implementation of personality routines to satisfy reference from |
| /// exception tables |
| .section .text.__gcc_personality_v0, "ax", %progbits |
| .global __gxx_personality_v0 |
| __gxx_personality_v0: |
| .fnstart |
| bx lr |
| .cantunwind |
| .fnend |
| |
| .section .text.__gcc_personality_v1, "ax", %progbits |
| .global __gxx_personality_v1 |
| __gxx_personality_v1: |
| .fnstart |
| bx lr |
| .cantunwind |
| .fnend |
| |
| .section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits |
| .global __aeabi_unwind_cpp_pr0 |
| __aeabi_unwind_cpp_pr0: |
| .fnstart |
| bx lr |
| .cantunwind |
| .fnend |
| |
| // Entry point for GC |
| .text |
| .global _start |
| _start: |
| bl func1 |
| bl func2 |
| bx lr |
| |
| /// GC should have only removed unusedfunc1 and unusedfunc2 the personality |
| /// routines are kept alive by references from live .ARM.exidx and .ARM.extab |
| /// sections |
| // CHECK: Disassembly of section .text: |
| // CHECK-EMPTY: |
| // CHECK-NEXT: <_start>: |
| // CHECK-NEXT: 2010c: bl #4 <func1> |
| // CHECK-NEXT: 20110: bl #4 <func2> |
| // CHECK-NEXT: 20114: bx lr |
| // CHECK: <func1>: |
| // CHECK-NEXT: 20118: bx lr |
| // CHECK: <func2>: |
| // CHECK-NEXT: 2011c: bx lr |
| // CHECK: <__gxx_personality_v0>: |
| // CHECK-NEXT: 20120: bx lr |
| // CHECK: <__aeabi_unwind_cpp_pr0>: |
| // CHECK-NEXT: 20124: bx lr |
| |
| /// GC should have removed table entries for unusedfunc1, unusedfunc2 |
| /// and __gxx_personality_v1 |
| // CHECK-NOT: unusedfunc1 |
| // CHECK-NOT: unusedfunc2 |
| // CHECK-NOT: __gxx_personality_v1 |
| |
| /// CHECK-EXIDX: Contents of section .ARM.exidx: |
| /// 100d4 + 1038 = 1110c = _start |
| /// 100dc + 103c = 11118 = func1 |
| // CHECK-EXIDX-NEXT: 100d4 38000100 01000000 3c000100 08849780 |
| /// 100e4 + 1038 = 1111c = func2 (100e8 + 1c = 10104 = .ARM.extab) |
| /// 100ec + 1034 = 11120 = __gxx_personality_v0 |
| // CHECK-EXIDX-NEXT: 100e4 38000100 1c000000 34000100 01000000 |
| /// 100f4 + 1030 = 11018 = __aeabi_unwind_cpp_pr0 |
| /// 100fc + 102c = 1101c = __aeabi_unwind_cpp_pr0 + sizeof(__aeabi_unwind_cpp_pr0) |
| // CHECK-EXIDX-NEXT: 100f4 30000100 01000000 2c000100 01000000 |
| // CHECK-EXIDX-NEXT: Contents of section .ARM.extab: |
| /// 10104 + 101c = 11120 = __gxx_personality_v0 |
| // CHECK-EXIDX-NEXT: 10104 1c000100 b0b0b000 |
