| // REQUIRES: arm |
| // RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi --arm-add-build-attributes %s -o %t |
| // RUN: ld.lld %t --no-merge-exidx-entries -o %t2 |
| // RUN: llvm-objdump -s %t2 | FileCheck %s |
| // RUN: ld.lld %t -o %t3 |
| // RUN: llvm-objdump -s %t3 | FileCheck %s --check-prefix=CHECK-MERGE |
| |
| /// The ARM.exidx section is a table of 8-byte entries of the form: |
| /// | PREL31 Relocation to start of function | Unwinding information | |
| /// The range of addresses covered by the table entry is terminated by the |
| /// next table entry. This means that an executable section without a .ARM.exidx |
| /// section does not terminate the range of addresses. To fix this the linker |
| /// synthesises an EXIDX_CANTUNWIND entry for each section without a .ARM.exidx |
| /// section. |
| |
| .syntax unified |
| |
| /// Expect inline unwind instructions |
| .section .text.01, "ax", %progbits |
| .global f1 |
| f1: |
| .fnstart |
| bx lr |
| .save {r7, lr} |
| .setfp r7, sp, #0 |
| .fnend |
| |
| /// Expect no unwind information from assembler. The linker must |
| /// synthesise an EXIDX_CANTUNWIND entry to prevent an exception |
| /// thrown through f2 from matching against the unwind instructions |
| /// for f1. |
| .section .text.02, "ax", %progbits |
| .global f2 |
| f2: |
| bx lr |
| |
| |
| /// Expect 1 EXIDX_CANTUNWIND entry that can be merged into the linker |
| /// generated EXIDX_CANTUNWIND as if the assembler had generated it. |
| .section .text.03, "ax",%progbits |
| .global f3 |
| f3: |
| .fnstart |
| bx lr |
| .cantunwind |
| .fnend |
| |
| /// Dummy implementation of personality routines to satisfy reference |
| /// from exception tables, linker will generate EXIDX_CANTUNWIND. |
| .section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits |
| .global __aeabi_unwind_cpp_pr0 |
| __aeabi_unwind_cpp_pr0: |
| bx lr |
| |
| /// f1, f2 |
| // CHECK: 100d4 28000100 08849780 24000100 01000000 |
| /// f3, __aeabi_unwind_cpp_pr0 |
| // CHECK-NEXT: 100e4 20000100 01000000 1c000100 01000000 |
| /// sentinel |
| // CHECK-NEXT: 100f4 18000100 01000000 |
| |
| /// f1, (f2, f3, __aeabi_unwind_cpp_pr0) |
| // CHECK-MERGE: 100d4 18000100 08849780 14000100 01000000 |
| /// sentinel |
| // CHECK-MERGE-NEXT: 100e4 18000100 01000000 |
| |
