forked from OSchip/llvm-project
126 lines
3.7 KiB
ArmAsm
126 lines
3.7 KiB
ArmAsm
// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t
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// RUN: ld.lld %t -o %t2 --gc-sections 2>&1
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// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %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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// REQUIRES: arm
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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-NEXT: _start:
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// CHECK-NEXT: 11000: 01 00 00 eb bl #4 <func1>
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// CHECK-NEXT: 11004: 01 00 00 eb bl #4 <func2>
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// CHECK-NEXT: 11008: 1e ff 2f e1 bx lr
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// CHECK: func1:
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// CHECK-NEXT: 1100c: 1e ff 2f e1 bx lr
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// CHECK: func2:
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// CHECK-NEXT: 11010: 1e ff 2f e1 bx lr
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// CHECK: __gxx_personality_v0:
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// CHECK-NEXT: 11014: 1e ff 2f e1 bx lr
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// CHECK: __aeabi_unwind_cpp_pr0:
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// CHECK-NEXT: 11018: 1e ff 2f e1 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-NOT: Contents of section .ARM.extab.text.unusedfunc2:
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// CHECK-EXIDX: Contents of section .ARM.exidx:
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// 100d4 + f38 = 1100c = func1
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// 100dc + f34 = 11010 = func2 (100e0 + 1c = 100fc = .ARM.extab.text.func2)
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// CHECK-EXIDX-NEXT: 100d4 380f0000 08849780 340f0000 1c000000
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// 100e4 + f30 = 11014 = __gxx_personality_v0
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// 100ec + f2c = 11018 = __aeabi_unwind_cpp_pr0
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// CHECK-EXIDX-NEXT: 100e4 300f0000 01000000 2c0f0000 01000000
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// 100f4 + f28 = 1101c = __aeabi_unwind_cpp_pr0 + sizeof(__aeabi_unwind_cpp_pr0)
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// CHECK-EXIDX-NEXT: 100f4 280f0000 01000000
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// CHECK-EXIDX-NEXT: Contents of section .ARM.extab.text.func2:
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// 100fc + f18 = 11014 = __gxx_personality_v0
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// CHECK-EXIDX-NEXT: 100fc 180f0000 b0b0b000
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