mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-16 13:18:12 +01:00
84d4150668
Greetings,
We use libunwind just for stack traces (I suspect many others do as well).
The use pattern is:
GetStackTrace(void** result, int max_depth)
{
...
unw_getcontext(&uc);
unw_init_local(&cursor, &uc);
while (n < max_depth) {
if (unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip) < 0) {
break;
}
result[n++] = ip;
if (unw_step(&cursor) <= 0) {
break;
}
}
Given this usage, it is quite convenient for us to block signals (or
prevent signal handlers from re-entering libunwind by other means) at the
"top level", which makes most of the sigprocmask calls performed by
libunwind itself unneccessary.
The second patch in this series adds a configure option which removes most
of the sigprocmask calls.
Attached patch is a preliminary for it -- consolidating all of the
"sigprocmask; mutex_lock;" sequences into lock_acquire and "mutex_unlock;
sigprocmask;" sequences into lock_release.
Thanks,
--
Paul Pluzhnikov
commit 402d15b123d54a7669db7cf17a76dd315094e472
Author: Paul Pluzhnikov <ppluzhnikov@google.com>
Date: Mon Sep 21 10:18:28 2009 -0700
Replace "sigprocmask + mutext_lock" with a single lock_acquire.
Likewise, replace "mutext_unlock + sigprocmask" with lock_release.
182 lines
5.5 KiB
C
182 lines
5.5 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2006-2007 IBM
|
|
Contributed by
|
|
Corey Ashford <cjashfor@us.ibm.com>
|
|
Jose Flavio Aguilar Paulino <jflavio@br.ibm.com> <joseflavio@gmail.com>
|
|
|
|
This file is part of libunwind.
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining
|
|
a copy of this software and associated documentation files (the
|
|
"Software"), to deal in the Software without restriction, including
|
|
without limitation the rights to use, copy, modify, merge, publish,
|
|
distribute, sublicense, and/or sell copies of the Software, and to
|
|
permit persons to whom the Software is furnished to do so, subject to
|
|
the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
|
|
#include "unwind_i.h"
|
|
#include "dwarf_i.h"
|
|
|
|
HIDDEN pthread_mutex_t ppc64_lock = PTHREAD_MUTEX_INITIALIZER;
|
|
HIDDEN int tdep_needs_initialization = 1;
|
|
|
|
/* The API register numbers are exactly the same as the .eh_frame
|
|
registers, for now at least. */
|
|
uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH] =
|
|
{
|
|
[UNW_PPC64_R0]=UNW_PPC64_R0,
|
|
[UNW_PPC64_R1]=UNW_PPC64_R1,
|
|
[UNW_PPC64_R2]=UNW_PPC64_R2,
|
|
[UNW_PPC64_R3]=UNW_PPC64_R3,
|
|
[UNW_PPC64_R4]=UNW_PPC64_R4,
|
|
[UNW_PPC64_R5]=UNW_PPC64_R5,
|
|
[UNW_PPC64_R6]=UNW_PPC64_R6,
|
|
[UNW_PPC64_R7]=UNW_PPC64_R7,
|
|
[UNW_PPC64_R8]=UNW_PPC64_R8,
|
|
[UNW_PPC64_R9]=UNW_PPC64_R9,
|
|
[UNW_PPC64_R10]=UNW_PPC64_R10,
|
|
[UNW_PPC64_R11]=UNW_PPC64_R11,
|
|
[UNW_PPC64_R12]=UNW_PPC64_R12,
|
|
[UNW_PPC64_R13]=UNW_PPC64_R13,
|
|
[UNW_PPC64_R14]=UNW_PPC64_R14,
|
|
[UNW_PPC64_R15]=UNW_PPC64_R15,
|
|
[UNW_PPC64_R16]=UNW_PPC64_R16,
|
|
[UNW_PPC64_R17]=UNW_PPC64_R17,
|
|
[UNW_PPC64_R18]=UNW_PPC64_R18,
|
|
[UNW_PPC64_R19]=UNW_PPC64_R19,
|
|
[UNW_PPC64_R20]=UNW_PPC64_R20,
|
|
[UNW_PPC64_R21]=UNW_PPC64_R21,
|
|
[UNW_PPC64_R22]=UNW_PPC64_R22,
|
|
[UNW_PPC64_R23]=UNW_PPC64_R23,
|
|
[UNW_PPC64_R24]=UNW_PPC64_R24,
|
|
[UNW_PPC64_R25]=UNW_PPC64_R25,
|
|
[UNW_PPC64_R26]=UNW_PPC64_R26,
|
|
[UNW_PPC64_R27]=UNW_PPC64_R27,
|
|
[UNW_PPC64_R28]=UNW_PPC64_R28,
|
|
[UNW_PPC64_R29]=UNW_PPC64_R29,
|
|
[UNW_PPC64_R30]=UNW_PPC64_R30,
|
|
[UNW_PPC64_R31]=UNW_PPC64_R31,
|
|
|
|
[UNW_PPC64_F0]=UNW_PPC64_F0,
|
|
[UNW_PPC64_F1]=UNW_PPC64_F1,
|
|
[UNW_PPC64_F2]=UNW_PPC64_F2,
|
|
[UNW_PPC64_F3]=UNW_PPC64_F3,
|
|
[UNW_PPC64_F4]=UNW_PPC64_F4,
|
|
[UNW_PPC64_F5]=UNW_PPC64_F5,
|
|
[UNW_PPC64_F6]=UNW_PPC64_F6,
|
|
[UNW_PPC64_F7]=UNW_PPC64_F7,
|
|
[UNW_PPC64_F8]=UNW_PPC64_F8,
|
|
[UNW_PPC64_F9]=UNW_PPC64_F9,
|
|
[UNW_PPC64_F10]=UNW_PPC64_F10,
|
|
[UNW_PPC64_F11]=UNW_PPC64_F11,
|
|
[UNW_PPC64_F12]=UNW_PPC64_F12,
|
|
[UNW_PPC64_F13]=UNW_PPC64_F13,
|
|
[UNW_PPC64_F14]=UNW_PPC64_F14,
|
|
[UNW_PPC64_F15]=UNW_PPC64_F15,
|
|
[UNW_PPC64_F16]=UNW_PPC64_F16,
|
|
[UNW_PPC64_F17]=UNW_PPC64_F17,
|
|
[UNW_PPC64_F18]=UNW_PPC64_F18,
|
|
[UNW_PPC64_F19]=UNW_PPC64_F19,
|
|
[UNW_PPC64_F20]=UNW_PPC64_F20,
|
|
[UNW_PPC64_F21]=UNW_PPC64_F21,
|
|
[UNW_PPC64_F22]=UNW_PPC64_F22,
|
|
[UNW_PPC64_F23]=UNW_PPC64_F23,
|
|
[UNW_PPC64_F24]=UNW_PPC64_F24,
|
|
[UNW_PPC64_F25]=UNW_PPC64_F25,
|
|
[UNW_PPC64_F26]=UNW_PPC64_F26,
|
|
[UNW_PPC64_F27]=UNW_PPC64_F27,
|
|
[UNW_PPC64_F28]=UNW_PPC64_F28,
|
|
[UNW_PPC64_F29]=UNW_PPC64_F29,
|
|
[UNW_PPC64_F30]=UNW_PPC64_F30,
|
|
[UNW_PPC64_F31]=UNW_PPC64_F31,
|
|
|
|
[UNW_PPC64_LR]=UNW_PPC64_LR,
|
|
[UNW_PPC64_CTR]=UNW_PPC64_CTR,
|
|
[UNW_PPC64_ARG_POINTER]=UNW_PPC64_ARG_POINTER,
|
|
|
|
[UNW_PPC64_CR0]=UNW_PPC64_CR0,
|
|
[UNW_PPC64_CR1]=UNW_PPC64_CR1,
|
|
[UNW_PPC64_CR2]=UNW_PPC64_CR2,
|
|
[UNW_PPC64_CR3]=UNW_PPC64_CR3,
|
|
[UNW_PPC64_CR4]=UNW_PPC64_CR4,
|
|
[UNW_PPC64_CR5]=UNW_PPC64_CR5,
|
|
[UNW_PPC64_CR6]=UNW_PPC64_CR6,
|
|
[UNW_PPC64_CR7]=UNW_PPC64_CR7,
|
|
|
|
[UNW_PPC64_XER]=UNW_PPC64_XER,
|
|
|
|
[UNW_PPC64_V0]=UNW_PPC64_V0,
|
|
[UNW_PPC64_V1]=UNW_PPC64_V1,
|
|
[UNW_PPC64_V2]=UNW_PPC64_V2,
|
|
[UNW_PPC64_V3]=UNW_PPC64_V3,
|
|
[UNW_PPC64_V4]=UNW_PPC64_V4,
|
|
[UNW_PPC64_V5]=UNW_PPC64_V5,
|
|
[UNW_PPC64_V6]=UNW_PPC64_V6,
|
|
[UNW_PPC64_V7]=UNW_PPC64_V7,
|
|
[UNW_PPC64_V8]=UNW_PPC64_V8,
|
|
[UNW_PPC64_V9]=UNW_PPC64_V9,
|
|
[UNW_PPC64_V10]=UNW_PPC64_V10,
|
|
[UNW_PPC64_V11]=UNW_PPC64_V11,
|
|
[UNW_PPC64_V12]=UNW_PPC64_V12,
|
|
[UNW_PPC64_V13]=UNW_PPC64_V13,
|
|
[UNW_PPC64_V14]=UNW_PPC64_V14,
|
|
[UNW_PPC64_V15]=UNW_PPC64_V15,
|
|
[UNW_PPC64_V16]=UNW_PPC64_V16,
|
|
[UNW_PPC64_V17]=UNW_PPC64_V17,
|
|
[UNW_PPC64_V18]=UNW_PPC64_V18,
|
|
[UNW_PPC64_V19]=UNW_PPC64_V19,
|
|
[UNW_PPC64_V20]=UNW_PPC64_V20,
|
|
[UNW_PPC64_V21]=UNW_PPC64_V21,
|
|
[UNW_PPC64_V22]=UNW_PPC64_V22,
|
|
[UNW_PPC64_V23]=UNW_PPC64_V23,
|
|
[UNW_PPC64_V24]=UNW_PPC64_V24,
|
|
[UNW_PPC64_V25]=UNW_PPC64_V25,
|
|
[UNW_PPC64_V26]=UNW_PPC64_V26,
|
|
[UNW_PPC64_V27]=UNW_PPC64_V27,
|
|
[UNW_PPC64_V28]=UNW_PPC64_V28,
|
|
[UNW_PPC64_V29]=UNW_PPC64_V29,
|
|
[UNW_PPC64_V30]=UNW_PPC64_V30,
|
|
[UNW_PPC64_V31]=UNW_PPC64_V31,
|
|
|
|
[UNW_PPC64_VRSAVE]=UNW_PPC64_VRSAVE,
|
|
[UNW_PPC64_VSCR]=UNW_PPC64_VSCR,
|
|
[UNW_PPC64_SPE_ACC]=UNW_PPC64_SPE_ACC,
|
|
[UNW_PPC64_SPEFSCR]=UNW_PPC64_SPEFSCR,
|
|
};
|
|
|
|
HIDDEN void
|
|
tdep_init (void)
|
|
{
|
|
intrmask_t saved_mask;
|
|
|
|
sigfillset (&unwi_full_mask);
|
|
|
|
lock_acquire (&ppc64_lock, saved_mask);
|
|
{
|
|
if (!tdep_needs_initialization)
|
|
/* another thread else beat us to it... */
|
|
goto out;
|
|
|
|
mi_init ();
|
|
|
|
dwarf_init ();
|
|
|
|
#ifndef UNW_REMOTE_ONLY
|
|
ppc64_local_addr_space_init ();
|
|
#endif
|
|
tdep_needs_initialization = 0; /* signal that we're initialized... */
|
|
}
|
|
out:
|
|
lock_release (&ppc64_lock, saved_mask);
|
|
}
|