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tile: fix DWARF bug in clone() for created thread

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Previously, we would see a bad frame in the gdb backtrace output, e.g.:

  (gdb) bt
  #0  foo () at foo.c:5
  #1  0x000000aaaab68ee8 in start_thread () from /lib/libpthread.so.0
  #2  0x000000aaaad01c88 in clone () from /lib/libc.so.6
  #3  0x0000000000000000 in ?? ()

With this change the bogus frame #3 is gone and we have the
same output as x86 does for the same program.
This commit is contained in:
Chris Metcalf 2012-12-14 10:46:54 -05:00
parent 147d03b01c
commit 2bc2d8e823
2 changed files with 6 additions and 1 deletions
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4
ports/ChangeLog.tile
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@ -1,3 +1,7 @@
2012-12-14 Chris Metcalf <cmetcalf@tilera.com>
* sysdeps/unix/sysv/linux/tile/nptl/clone.S: Fix DWARF info.
2012-11-29 Chris Metcalf <cmetcalf@tilera.com>
* sysdeps/tile/s_fmaf.c: Remove redundant #defines now provided

3
ports/sysdeps/unix/sysv/linux/tile/nptl/clone.S
View File

@ -160,6 +160,8 @@ ENTRY (__clone)
r32: the user function pointer */
.Lthread_start:
cfi_def_cfa_offset (FRAME_SIZE)
cfi_undefined (lr)
/* Check and see if we need to reset the PID, which we do if
CLONE_THREAD isn't set, i.e. we're not staying in the thread group.
If CLONE_VM is set, we're doing some kind of thread-like clone,
@ -167,7 +169,6 @@ ENTRY (__clone)
in getpid(). Otherwise (if CLONE_VM isn't set), it's a
fork-like clone, and we go ahead and write the cached values
from the true system pid (retrieved via __NR_getpid syscall). */
cfi_def_cfa_offset (FRAME_SIZE)
#ifdef __tilegx__
{
moveli r0, hw1_last(CLONE_VM)