1 files changed, 125 insertions, 0 deletions
diff --git a/test/ELF/arm-exidx-gc.s b/test/ELF/arm-exidx-gc.s
new file mode 100644
index 000000000000..b1a5be54aa2b
--- /dev/null
+++ b/test/ELF/arm-exidx-gc.s
@@ -0,0 +1,125 @@
+// RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t
+// RUN: ld.lld %t -o %t2 --gc-sections 2>&1
+// RUN: llvm-objdump -d -triple=armv7a-none-linux-gnueabi %t2 | FileCheck %s
+// RUN: llvm-objdump -s -triple=armv7a-none-linux-gnueabi %t2 | FileCheck -check-prefix=CHECK-EXIDX %s
+// REQUIRES: arm
+
+// 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-NEXT: _start:
+// CHECK-NEXT:   11000:       01 00 00 eb     bl      #4 <func1>
+// CHECK-NEXT:   11004:       01 00 00 eb     bl      #4 <func2>
+// CHECK-NEXT:   11008:       1e ff 2f e1     bx      lr
+// CHECK: func1:
+// CHECK-NEXT:   1100c:       1e ff 2f e1     bx      lr
+// CHECK: func2:
+// CHECK-NEXT:   11010:       1e ff 2f e1     bx      lr
+// CHECK: __gxx_personality_v0:
+// CHECK-NEXT:   11014:       1e ff 2f e1     bx      lr
+// CHECK: __aeabi_unwind_cpp_pr0:
+// CHECK-NEXT:   11018:       1e ff 2f e1     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-NOT: Contents of section .ARM.extab.text.unusedfunc2:
+// CHECK-EXIDX: Contents of section .ARM.exidx:
+// 100d4 + f38 = 1100c = func1
+// 100dc + f34 = 11010 = func2 (100e0 + 1c = 100fc = .ARM.extab.text.func2)
+// CHECK-EXIDX-NEXT: 100d4 380f0000 08849780 340f0000 1c000000
+// 100e4 + f30 = 11014 = __gxx_personality_v0
+// 100ec + f2c = 11018 = __aeabi_unwind_cpp_pr0
+// CHECK-EXIDX-NEXT: 100e4 300f0000 01000000 2c0f0000 01000000
+// 100f4 + f28 = 1101c = __aeabi_unwind_cpp_pr0 + sizeof(__aeabi_unwind_cpp_pr0)
+// CHECK-EXIDX-NEXT: 100f4 280f0000 01000000
+// CHECK-EXIDX-NEXT: Contents of section .ARM.extab.text.func2:
+// 100fc + f18 = 11014 = __gxx_personality_v0
+// CHECK-EXIDX-NEXT: 100fc 180f0000 b0b0b000