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arm: ptrace: Fix order of probing unwind tables

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Commit 92327a3 "ARM: prefer to unwind using DWARF info"
changes order of unwind info searching to prefer DWARF (.debug_frame)
section in prior to ARM specific (.ARM.exidx). This patch only affects
local process unwinding. Now the same is done for remote unwinding.

Sometimes probing .ARM.exidx first causes backtrace truncation
after __aeabi_ldiv0 (division by 0 handler that generates SIGFPE),
because it hits [cantunwind] generated by cross-gcc for __divsi3
function copied with __aeabi_ldiv0 from libgcc.a. Perhaps, lack of
debug info for __divsi3 causes [cantunwind], or there is a problem
converting DWARF to ARM unwind tables, but when unwinding using
DWARF, it hits proper entry, and backtrace is shown correctly.

Reported-by: Frederic Berat <fberat@de.adit-jv.com>
Signed-off-by: Vitaly Kuzmichev <Vitaly_Kuzmichev@mentor.com>
This commit is contained in:
Vitaly Kuzmichev 2017-01-19 20:08:00 +03:00 committed by Dave Watson
parent 11a053f5ca
commit 7885596b9c
1 changed files with 4 additions and 4 deletions
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8
src/ptrace/_UPT_find_proc_info.c
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@ -131,15 +131,15 @@ _UPT_find_proc_info (unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
ret = tdep_search_unwind_table (as, ip, &ui->edi.di_cache,
pi, need_unwind_info, arg);
if (ret == -UNW_ENOINFO && ui->edi.di_debug.format != -1)
ret = tdep_search_unwind_table (as, ip, &ui->edi.di_debug, pi,
need_unwind_info, arg);
#if UNW_TARGET_ARM
if (ret == -UNW_ENOINFO && ui->edi.di_arm.format != -1)
ret = tdep_search_unwind_table (as, ip, &ui->edi.di_arm, pi,
need_unwind_info, arg);
#endif
if (ret == -UNW_ENOINFO && ui->edi.di_debug.format != -1)
ret = tdep_search_unwind_table (as, ip, &ui->edi.di_debug, pi,
need_unwind_info, arg);
return ret;
}