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Add some cfi directives in the code doing syscall (by Valgrind).

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This allows to attach to Valgrind when VAlgrind is blocked in a syscall
and have GDB producing a stacktrace, rather than being unable
to unwind.
I.e. instead of having:
  (gdb) bt
  #0  0x380460f2 in do_syscall_WRK ()
  (gdb) 
with the directives, we obtain:
   (gdb) bt
   #0  vgPlain_mk_SysRes_x86_linux (val=1) at m_syscall.c:65
   #1  vgPlain_do_syscall (sysno=168, a1=944907996, a2=1, a3=4294967295, a4=0, a5=0, a6=0, a7=0, a8=0) at m_syscall.c:791
   #2  0x38031986 in vgPlain_poll (fds=0x385226dc <remote_desc_pollfdread_activity>, nfds=1, timeout=-1) at m_libcfile.c:535
   #3  0x3807479f in vgPlain_poll_no_eintr (fds=0x385226dc <remote_desc_pollfdread_activity>, nfds=1, timeout=-1)
       at m_gdbserver/remote-utils.c:86
   #4  0x380752f0 in readchar (single=4096) at m_gdbserver/remote-utils.c:938
   #5  0x38075ae3 in getpkt (buf=0x61f35020 "") at m_gdbserver/remote-utils.c:997
   #6  0x38076fcb in server_main () at m_gdbserver/server.c:1048
   #7  0x38072af2 in call_gdbserver (tid=1, reason=init_reason) at m_gdbserver/m_gdbserver.c:721
   #8  0x380735ba in vgPlain_gdbserver (tid=1) at m_gdbserver/m_gdbserver.c:788
   #9  0x3802c6ef in do_actions_on_error (allow_db_attach=<optimized out>, err=<optimized out>) at m_errormgr.c:532
   #10 pp_Error (err=0x61f580e0, allow_db_attach=1 '\001', xml=1 '\001') at m_errormgr.c:644
   #11 0x3802cc34 in vgPlain_maybe_record_error (tid=1643479264, ekind=8, a=2271560481, s=0x0, extra=0x62937f1c)
       at m_errormgr.c:851
   #12 0x38028821 in vgMemCheck_record_free_error (tid=1, a=2271560481) at mc_errors.c:836
   #13 0x38007b65 in vgMemCheck_free (tid=1, p=0x87654321) at mc_malloc_wrappers.c:496
   #14 0x3807e261 in do_client_request (tid=1) at m_scheduler/scheduler.c:1840
   #15 vgPlain_scheduler (tid=1) at m_scheduler/scheduler.c:1406
   #16 0x3808b6b2 in thread_wrapper (tidW=<optimized out>) at m_syswrap/syswrap-linux.c:102
   #17 run_a_thread_NORETURN (tidW=1) at m_syswrap/syswrap-linux.c:155
   #18 0x00000000 in ?? ()
   (gdb) 




git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15194
This commit is contained in:
Philippe Waroquiers 2015-05-08 21:37:18 +00:00
parent f08c405714
commit bd9e34096e
1 changed files with 10 additions and 0 deletions
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10
coregrind/m_syscall.c
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@ -305,10 +305,15 @@ asm(
".text\n"
".globl do_syscall_WRK\n"
"do_syscall_WRK:\n"
" .cfi_startproc\n"
" push %esi\n"
" .cfi_adjust_cfa_offset 4\n"
" push %edi\n"
" .cfi_adjust_cfa_offset 4\n"
" push %ebx\n"
" .cfi_adjust_cfa_offset 4\n"
" push %ebp\n"
" .cfi_adjust_cfa_offset 4\n"
" movl 16+ 4(%esp),%eax\n"
" movl 16+ 8(%esp),%ebx\n"
" movl 16+12(%esp),%ecx\n"
@ -318,10 +323,15 @@ asm(
" movl 16+28(%esp),%ebp\n"
" int $0x80\n"
" popl %ebp\n"
" .cfi_adjust_cfa_offset -4\n"
" popl %ebx\n"
" .cfi_adjust_cfa_offset -4\n"
" popl %edi\n"
" .cfi_adjust_cfa_offset -4\n"
" popl %esi\n"
" .cfi_adjust_cfa_offset -4\n"
" ret\n"
" .cfi_endproc\n"
".previous\n"
);