1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// 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 28100000 08849780 24100000 01000000
// f3, __aeabi_unwind_cpp_pr0
// CHECK-NEXT: 100e4 20100000 01000000 1c100000 01000000
// sentinel
// CHECK-NEXT: 100f4 18100000 01000000
// f1, (f2, f3, __aeabi_unwind_cpp_pr0)
// CHECK-MERGE: 100d4 18100000 08849780 14100000 01000000
// sentinel
// CHECK-MERGE-NEXT: 100e4 18100000 01000000
|
