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test/ELF/arm-exidx-add-missing.s
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| // 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 wihout 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 2c0f0000 08849780 280f0000 01000000 | |||||
| // f3, __aeabi_unwind_cpp_pr0 | |||||
| // CHECK-NEXT: 100e4 240f0000 01000000 200f0000 01000000 | |||||
| // sentinel | |||||
| // CHECK-NEXT: 100f4 1c0f0000 01000000 | |||||
| // f1, (f2, f3, __aeabi_unwind_cpp_pr0) | |||||
| // CHECK-MERGE: 100d4 2c0f0000 08849780 280f0000 01000000 | |||||
| // sentinel | |||||
| // CHECK-MERGE-NEXT: 100e4 2c0f0000 01000000 | |||||