bionic/libc/arch-x86
Elliott Hughes 36f451a6d9 Fix signal trampolines.
* LP32 should use sa_restorer too. gdb expects this, and future (>= 3.15) x86
  kernels will apparently stop supporting the case where SA_RESTORER isn't
  set.

* gdb and libunwind care about the exact instruction sequences, so we need to
  modify the code slightly in a few cases to match what they're looking for.

* gdb also cares about the exact function names (for some architectures),
  so we need to use __restore and __restore_rt rather than __sigreturn and
  __rt_sigreturn.

* It's possible that we don't have a VDSO; dl_iterate_phdr shouldn't assume
  that getauxval(AT_SYSINFO_EHDR) will return a non-null pointer.

This fixes unwinding through a signal handler in gdb for all architectures.
It doesn't fix libunwind for arm and arm64. I'll keep investigating that...

Bug: 17436734
Change-Id: Ic1ea1184db6655c5d96180dc07bcc09628e647cb
2014-09-15 15:04:14 -07:00
..
atom Replace ambiguous cmp instruction with cmpl. 2014-08-27 15:04:23 -07:00
bionic Fix signal trampolines. 2014-09-15 15:04:14 -07:00
generic Remove the unused swab.S. 2014-07-22 20:21:31 -07:00
include/machine Add IFUNC support for arm64 and IRELATIVE reloc 2014-09-11 16:30:45 -07:00
silvermont Regenerate the bionic NOTICE files. 2014-07-07 15:42:06 -07:00
syscalls Add posix_fadvise(3). 2014-09-11 08:45:46 -07:00
x86.mk Fix signal trampolines. 2014-09-15 15:04:14 -07:00