llvm-project/lld/test/ELF/arm-exidx-sentinel-noreloca...

// RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o %t.o
// RUN: ld.lld -r %t.o -o %t
// REQUIRES: arm
// RUN: llvm-readobj -s %t | FileCheck %s
// Check that when doing a relocatable link we don't add a terminating entry
// to the .ARM.exidx section
 .syntax unified
 .text
_start:
 .fnstart
 .cantunwind
 bx lr
 .fnend

// Expect 1 table entry of size 8
// CHECK: Name: .ARM.exidx
// CHECK: Size: 8
[ELF] Add terminating sentinel .ARM.exidx table entry The .ARM.exidx table has an entry for each function with the first entry giving the start address of the function, the table is sorted in ascending order of function address. Given a PC value, the unwinder will search the table for the entry that contains the PC value. If the table entry happens to be the last, the range of the addresses that the final unwinding table describes will extend to the end of the address space. To prevent an incorrect address outside the address range of the program matching the last entry we follow ld.bfd's example and add a sentinel EXIDX_CANTUNWIND entry at the end of the table. This gives the final real table entry an upper bound. In addition the llvm libunwind unwinder currently depends on the presence of a sentinel entry (PR31091). Differential revision: https://reviews.llvm.org/D26977 llvm-svn: 287869 2016-11-24 19:43:55 +08:00			`// RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o %t.o`
			`// RUN: ld.lld -r %t.o -o %t`
			`// REQUIRES: arm`
			`// RUN: llvm-readobj -s %t \| FileCheck %s`
			`// Check that when doing a relocatable link we don't add a terminating entry`
			`// to the .ARM.exidx section`
			`.syntax unified`
			`.text`
			`_start:`
			`.fnstart`
			`.cantunwind`
			`bx lr`
			`.fnend`

			`// Expect 1 table entry of size 8`
			`// CHECK: Name: .ARM.exidx`
			`// CHECK: Size: 8`