powerpc64 target does not generate mandatory traceback table

[llvmbot]

Bugzilla Link	13641
Resolution	FIXED
Resolved on	Aug 28, 2012 14:08
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor

Extended Description

On powerpc64-unknown-linux-gnu, the mandatory traceback table for debug and exception handling support is not produced. See section 3.3 of the 64-bit PowerPC ELF Application Binary Interface Supplement at http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html. A traceback table should appear after the last instruction of each function, and should look something like this:

blr
.long 0
.byte 0,0,0,0,128,1,0,1
.size	foo,.-.L.foo

The .long field is an illegal instruction that signals the start of the traceback table, and the eight-byte entry that follows is the mandatory portion of the traceback table. Code generated by LLVM does not include these two fields.

[llvmbot]

Additional information: GDB does not require the traceback table, but it does require the .long 0 marking the end of the function, prior to the .size field. So at a minimum that needs to be provided.

[llvmbot]

Fixed in r162778.