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| author | Tom Tromey <tromey@redhat.com> | 2013-11-13 11:10:55 -0700 |
|---|---|---|
| committer | Tom Tromey <tromey@redhat.com> | 2013-11-22 11:02:01 -0700 |
| commit | da2b2fdf57a96f7a5b6b153e94afb747e212b17f (patch) | |
| tree | 8c60ba7bea00cadcb485eb9d3ea0aeec9fa02be2 /gdb/dwarf2-frame.c | |
| parent | 6eeee81c8e59511962bdd83df5e7785bfdf871d2 (diff) | |
| download | binutils-gdb-da2b2fdf57a96f7a5b6b153e94afb747e212b17f.tar.gz | |
handle an unspecified return address column
Debugging PR 16155 further, I found that the DWARF unwinder found the
function in question, but thought it had no registers saved
(fs->regs.num_regs == 0).
It seems to me that if a frame does not specify the return address
column, or if the return address column is explicitly marked as
DWARF2_FRAME_REG_UNSPECIFIED, then we should set the
"undefined_retaddr" flag and let the DWARF unwinder gracefully stop.
This patch implements that idea.
With this patch the backtrace works properly:
(gdb) bt
#0 0x0000007fb7ed485c in nanosleep () from /lib64/libc.so.6
#1 0x0000007fb7ed4508 in sleep () from /lib64/libc.so.6
#2 0x00000000004008bc in thread_function (arg=0x4) at threadapply.c:73
#3 0x0000007fb7fad950 in start_thread () from /lib64/libpthread.so.0
#4 0x0000007fb7f0956c in clone () from /lib64/libc.so.6
2013-11-22 Tom Tromey <tromey@redhat.com>
PR backtrace/16155:
* dwarf2-frame.c (dwarf2_frame_cache): Set undefined_retaddr if
the return address column is unspecified.
2013-11-22 Tom Tromey <tromey@redhat.com>
* gdb.dwarf2/dw2-bad-cfi.c: New file.
* gdb.dwarf2/dw2-bad-cfi.exp: New file.
* gdb.dwarf2/dw2-bad-cfi.S: New file.
Diffstat (limited to 'gdb/dwarf2-frame.c')
| -rw-r--r-- | gdb/dwarf2-frame.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c index c4f87715c17..f185ca6e8c1 100644 --- a/gdb/dwarf2-frame.c +++ b/gdb/dwarf2-frame.c @@ -1245,6 +1245,10 @@ incomplete CFI data; unspecified registers (e.g., %s) at %s"), if (fs->retaddr_column < fs->regs.num_regs && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED) cache->undefined_retaddr = 1; + else if (fs->retaddr_column >= fs->regs.num_regs + || (fs->regs.reg[fs->retaddr_column].how + == DWARF2_FRAME_REG_UNSPECIFIED)) + cache->undefined_retaddr = 1; do_cleanups (old_chain); discard_cleanups (reset_cache_cleanup); |