1// REQUIRES: arm
2// RUN: llvm-mc -filetype=obj --arm-add-build-attributes -triple=armv7a-none-linux-gnueabi %s -o %t
3// RUN: ld.lld %t --no-merge-exidx-entries -o %t2
4// RUN: llvm-objdump -s %t2 | FileCheck --check-prefix CHECK-DUPS %s
5// RUN: ld.lld %t -o %t3
6// RUN: llvm-objdump -s %t3 | FileCheck %s
7
8/// Test that lld can at least remove duplicate .ARM.exidx sections. A more
9/// fine grained implementation will be able to remove duplicate entries within
10/// a .ARM.exidx section.
11
12/// With duplicate entries
13// CHECK-DUPS: Contents of section .ARM.exidx:
14// CHECK-DUPS-NEXT: 100d4 78000100 01000000 74000100 01000000
15// CHECK-DUPS-NEXT: 100e4 70000100 01000000 6c000100 01000000
16// CHECK-DUPS-NEXT: 100f4 68000100 08849780 64000100 08849780
17// CHECK-DUPS-NEXT: 10104 60000100 08849780 5c000100 24000000
18// CHECK-DUPS-NEXT: 10114 58000100 28000000 54000100 01000000
19// CHECK-DUPS-NEXT: 10124 50000100 01000000 4c000100 01000000
20// CHECK-DUPS-NEXT: Contents of section .ARM.extab:
21
22/// After duplicate entry removal
23// CHECK: Contents of section .ARM.exidx:
24// CHECK-NEXT: 100d4 48000100 01000000 50000100 08849780
25// CHECK-NEXT: 100e4 54000100 1c000000 50000100 20000000
26// CHECK-NEXT: 100f4 4c000100 01000000 4c000100 01000000
27// CHECK-NEXT: Contents of section .ARM.extab:
28        .syntax unified
29
30        /// Expect 1 EXIDX_CANTUNWIND entry.
31        .section .text.00, "ax", %progbits
32        .globl _start
33_start:
34        .fnstart
35        bx lr
36        .cantunwind
37        .fnend
38
39        /// Expect .ARM.exidx.text.01 to be identical to .ARM.exidx.text.00
40        .section .text.01, "ax", %progbits
41        .globl f1
42f1:
43        .fnstart
44        bx lr
45        .cantunwind
46        .fnend
47
48        /// Expect 2 EXIDX_CANTUNWIND entries, these can be duplicated into
49        /// .ARM.exid.text.00
50        .section .text.02, "ax", %progbits
51        .globl f2
52f2:
53        .fnstart
54        bx lr
55        .cantunwind
56        .fnend
57
58        .globl f3
59f3:
60        .fnstart
61        bx lr
62        .cantunwind
63        .fnend
64
65        /// Expect inline unwind instructions, not a duplicate of previous entry.
66        .section .text.03, "ax", %progbits
67        .global f4
68f4:
69        .fnstart
70        bx lr
71        .save {r7, lr}
72        .setfp r7, sp, #0
73        .fnend
74
75        /// Expect 2 inline unwind entries that are a duplicate of
76        /// .ARM.exidx.text.03
77        .section .text.04, "ax", %progbits
78        .global f5
79f5:
80        .fnstart
81        bx lr
82        .save {r7, lr}
83        .setfp r7, sp, #0
84        .fnend
85
86        .global f6
87f6:
88        .fnstart
89        bx lr
90        .save {r7, lr}
91        .setfp r7, sp, #0
92        .fnend
93
94        /// Expect a section with a reference to an .ARM.extab. Not a duplicate
95        /// of previous inline table entry.
96        .section .text.05, "ax",%progbits
97        .global f7
98f7:
99        .fnstart
100        bx lr
101        .personality __gxx_personality_v0
102        .handlerdata
103        .long 0
104        .fnend
105
106        /// Expect a reference to an identical .ARM.extab. We do not try to
107        /// deduplicate references to .ARM.extab sections.
108        .section .text.06, "ax",%progbits
109        .global f8
110f8:
111        .fnstart
112        bx lr
113        .personality __gxx_personality_v0
114        .handlerdata
115        .long 0
116        .fnend
117
118/// Dummy implementation of personality routines to satisfy reference from
119/// exception tables
120/// Expect Linker generated EXIDX_CANTUNWIND tables
121        .section .text.__gcc_personality_v0, "ax", %progbits
122        .global __gxx_personality_v0
123__gxx_personality_v0:
124        bx lr
125
126        .section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits
127        .global __aeabi_unwind_cpp_pr0
128__aeabi_unwind_cpp_pr0:
129        bx lr
130