[Bug libc/19356] unwind stack failed if stack including syscall on armv7

["guonic at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19356

--- Comment #2 from Guonic <guonic at gmail dot com> ---
(In reply to joseph@codesourcery.com from comment #1)
> If one function has unwind info that relates to another function (as 
> opposed to EXIDX_CANTUNWIND for a function with no unwind info), that's a 
> bug in the static linker ld that was used to link glibc, not a bug in 
> glibc.  ld is meant to insert EXIDX_CANTUNWIND automatically for address 
> ranges without unwind info.

hi joseph,
thanks for your feedback, i think the unwind function for syscall(range
000d1970 - d199c) should be like
0xd1970: 0x80a3b0b0
  Compact model index: 0
  0xa3      pop {r4, r5, r6, r7}
  0xb0      finish
  0xb0      finish
, which can keep the register of SP is same, after unwind from syscall.

Did you mean this is the bug for ld?

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