forked from OSchip/llvm-project
127 lines
3.7 KiB
ArmAsm
127 lines
3.7 KiB
ArmAsm
// REQUIRES: arm
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// RUN: llvm-mc -filetype=obj --arm-add-build-attributes -triple=armv7a-none-linux-gnueabi %s -o %t
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// RUN: ld.lld %t --no-merge-exidx-entries -o %t2 --gc-sections
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// RUN: llvm-objdump -d --triple=armv7a-none-linux-gnueabi --no-show-raw-insn %t2 | FileCheck %s
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// RUN: llvm-objdump -s --triple=armv7a-none-linux-gnueabi %t2 | FileCheck --check-prefix=CHECK-EXIDX %s
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/// Test the behavior of .ARM.exidx sections under garbage collection
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/// A .ARM.exidx section is live if it has a relocation to a live executable
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/// section.
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/// A .ARM.exidx section may have a relocation to a .ARM.extab section, if the
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/// .ARM.exidx is live then the .ARM.extab section is live
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.syntax unified
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.section .text.func1, "ax",%progbits
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.global func1
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func1:
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.fnstart
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bx lr
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.save {r7, lr}
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.setfp r7, sp, #0
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.fnend
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.section .text.unusedfunc1, "ax",%progbits
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.global unusedfunc1
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unusedfunc1:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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/// Unwinding instructions for .text2 too large for an inline entry ARM.exidx
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/// entry. A separate .ARM.extab section is created to hold the unwind entries
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/// The .ARM.exidx table entry has a reference to the .ARM.extab section.
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.section .text.func2, "ax",%progbits
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.global func2
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func2:
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.fnstart
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bx lr
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.personality __gxx_personality_v0
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.handlerdata
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.section .text.func2
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.fnend
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/// An unused function with a reference to a .ARM.extab section. Both should
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/// be removed by gc.
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.section .text.unusedfunc2, "ax",%progbits
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.global unusedfunc2
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unusedfunc2:
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.fnstart
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bx lr
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.personality __gxx_personality_v1
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.handlerdata
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.section .text.unusedfunc2
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.fnend
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/// Dummy implementation of personality routines to satisfy reference from
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/// exception tables
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.section .text.__gcc_personality_v0, "ax", %progbits
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.global __gxx_personality_v0
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__gxx_personality_v0:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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.section .text.__gcc_personality_v1, "ax", %progbits
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.global __gxx_personality_v1
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__gxx_personality_v1:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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.section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits
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.global __aeabi_unwind_cpp_pr0
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__aeabi_unwind_cpp_pr0:
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.fnstart
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bx lr
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.cantunwind
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.fnend
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// Entry point for GC
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.text
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.global _start
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_start:
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bl func1
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bl func2
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bx lr
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/// GC should have only removed unusedfunc1 and unusedfunc2 the personality
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/// routines are kept alive by references from live .ARM.exidx and .ARM.extab
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/// sections
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// CHECK: Disassembly of section .text:
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// CHECK-EMPTY:
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// CHECK-NEXT: <_start>:
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// CHECK-NEXT: 2010c: bl 0x20118 <func1>
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// CHECK-NEXT: 20110: bl 0x2011c <func2>
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// CHECK-NEXT: 20114: bx lr
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// CHECK: <func1>:
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// CHECK-NEXT: 20118: bx lr
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// CHECK: <func2>:
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// CHECK-NEXT: 2011c: bx lr
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// CHECK: <__gxx_personality_v0>:
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// CHECK-NEXT: 20120: bx lr
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// CHECK: <__aeabi_unwind_cpp_pr0>:
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// CHECK-NEXT: 20124: bx lr
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/// GC should have removed table entries for unusedfunc1, unusedfunc2
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/// and __gxx_personality_v1
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// CHECK-NOT: unusedfunc1
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// CHECK-NOT: unusedfunc2
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// CHECK-NOT: __gxx_personality_v1
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/// CHECK-EXIDX: Contents of section .ARM.exidx:
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/// 100d4 + 1038 = 1110c = _start
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/// 100dc + 103c = 11118 = func1
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// CHECK-EXIDX-NEXT: 100d4 38000100 01000000 3c000100 08849780
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/// 100e4 + 1038 = 1111c = func2 (100e8 + 1c = 10104 = .ARM.extab)
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/// 100ec + 1034 = 11120 = __gxx_personality_v0
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// CHECK-EXIDX-NEXT: 100e4 38000100 1c000000 34000100 01000000
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/// 100f4 + 1030 = 11018 = __aeabi_unwind_cpp_pr0
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/// 100fc + 102c = 1101c = __aeabi_unwind_cpp_pr0 + sizeof(__aeabi_unwind_cpp_pr0)
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// CHECK-EXIDX-NEXT: 100f4 30000100 01000000 2c000100 01000000
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// CHECK-EXIDX-NEXT: Contents of section .ARM.extab:
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/// 10104 + 101c = 11120 = __gxx_personality_v0
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// CHECK-EXIDX-NEXT: 10104 1c000100 b0b0b000
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