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https://github.com/tobast/libunwind-eh_elf.git
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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
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Copyright (C) 2006-2007 IBM
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Contributed by
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Corey Ashford <cjashfor@us.ibm.com>
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Jose Flavio Aguilar Paulino <jflavio@br.ibm.com> <joseflavio@gmail.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "unwind_i.h"
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#include "dwarf_i.h"
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HIDDEN pthread_mutex_t ppc64_lock = PTHREAD_MUTEX_INITIALIZER;
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HIDDEN int tdep_needs_initialization = 1;
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/* The API register numbers are exactly the same as the .eh_frame
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registers, for now at least. */
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uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH] =
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{
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[UNW_PPC64_R0]=UNW_PPC64_R0,
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[UNW_PPC64_R1]=UNW_PPC64_R1,
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[UNW_PPC64_R2]=UNW_PPC64_R2,
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[UNW_PPC64_R3]=UNW_PPC64_R3,
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[UNW_PPC64_R4]=UNW_PPC64_R4,
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[UNW_PPC64_R5]=UNW_PPC64_R5,
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[UNW_PPC64_R6]=UNW_PPC64_R6,
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[UNW_PPC64_R7]=UNW_PPC64_R7,
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[UNW_PPC64_R8]=UNW_PPC64_R8,
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[UNW_PPC64_R9]=UNW_PPC64_R9,
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[UNW_PPC64_R10]=UNW_PPC64_R10,
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[UNW_PPC64_R11]=UNW_PPC64_R11,
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[UNW_PPC64_R12]=UNW_PPC64_R12,
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[UNW_PPC64_R13]=UNW_PPC64_R13,
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[UNW_PPC64_R14]=UNW_PPC64_R14,
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[UNW_PPC64_R15]=UNW_PPC64_R15,
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[UNW_PPC64_R16]=UNW_PPC64_R16,
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[UNW_PPC64_R17]=UNW_PPC64_R17,
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[UNW_PPC64_R18]=UNW_PPC64_R18,
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[UNW_PPC64_R19]=UNW_PPC64_R19,
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[UNW_PPC64_R20]=UNW_PPC64_R20,
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[UNW_PPC64_R21]=UNW_PPC64_R21,
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[UNW_PPC64_R22]=UNW_PPC64_R22,
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[UNW_PPC64_R23]=UNW_PPC64_R23,
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[UNW_PPC64_R24]=UNW_PPC64_R24,
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[UNW_PPC64_R25]=UNW_PPC64_R25,
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[UNW_PPC64_R26]=UNW_PPC64_R26,
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[UNW_PPC64_R27]=UNW_PPC64_R27,
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[UNW_PPC64_R28]=UNW_PPC64_R28,
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[UNW_PPC64_R29]=UNW_PPC64_R29,
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[UNW_PPC64_R30]=UNW_PPC64_R30,
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[UNW_PPC64_R31]=UNW_PPC64_R31,
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[UNW_PPC64_F0]=UNW_PPC64_F0,
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[UNW_PPC64_F1]=UNW_PPC64_F1,
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[UNW_PPC64_F2]=UNW_PPC64_F2,
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[UNW_PPC64_F3]=UNW_PPC64_F3,
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[UNW_PPC64_F4]=UNW_PPC64_F4,
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[UNW_PPC64_F5]=UNW_PPC64_F5,
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[UNW_PPC64_F6]=UNW_PPC64_F6,
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[UNW_PPC64_F7]=UNW_PPC64_F7,
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[UNW_PPC64_F8]=UNW_PPC64_F8,
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[UNW_PPC64_F9]=UNW_PPC64_F9,
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[UNW_PPC64_F10]=UNW_PPC64_F10,
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[UNW_PPC64_F11]=UNW_PPC64_F11,
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[UNW_PPC64_F12]=UNW_PPC64_F12,
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[UNW_PPC64_F13]=UNW_PPC64_F13,
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[UNW_PPC64_F14]=UNW_PPC64_F14,
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[UNW_PPC64_F15]=UNW_PPC64_F15,
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[UNW_PPC64_F16]=UNW_PPC64_F16,
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[UNW_PPC64_F17]=UNW_PPC64_F17,
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[UNW_PPC64_F18]=UNW_PPC64_F18,
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[UNW_PPC64_F19]=UNW_PPC64_F19,
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[UNW_PPC64_F20]=UNW_PPC64_F20,
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[UNW_PPC64_F21]=UNW_PPC64_F21,
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[UNW_PPC64_F22]=UNW_PPC64_F22,
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[UNW_PPC64_F23]=UNW_PPC64_F23,
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[UNW_PPC64_F24]=UNW_PPC64_F24,
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[UNW_PPC64_F25]=UNW_PPC64_F25,
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[UNW_PPC64_F26]=UNW_PPC64_F26,
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[UNW_PPC64_F27]=UNW_PPC64_F27,
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[UNW_PPC64_F28]=UNW_PPC64_F28,
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[UNW_PPC64_F29]=UNW_PPC64_F29,
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[UNW_PPC64_F30]=UNW_PPC64_F30,
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[UNW_PPC64_F31]=UNW_PPC64_F31,
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[UNW_PPC64_LR]=UNW_PPC64_LR,
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[UNW_PPC64_CTR]=UNW_PPC64_CTR,
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[UNW_PPC64_ARG_POINTER]=UNW_PPC64_ARG_POINTER,
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[UNW_PPC64_CR0]=UNW_PPC64_CR0,
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[UNW_PPC64_CR1]=UNW_PPC64_CR1,
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[UNW_PPC64_CR2]=UNW_PPC64_CR2,
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[UNW_PPC64_CR3]=UNW_PPC64_CR3,
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[UNW_PPC64_CR4]=UNW_PPC64_CR4,
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[UNW_PPC64_CR5]=UNW_PPC64_CR5,
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[UNW_PPC64_CR6]=UNW_PPC64_CR6,
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[UNW_PPC64_CR7]=UNW_PPC64_CR7,
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[UNW_PPC64_XER]=UNW_PPC64_XER,
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[UNW_PPC64_V0]=UNW_PPC64_V0,
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[UNW_PPC64_V1]=UNW_PPC64_V1,
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[UNW_PPC64_V2]=UNW_PPC64_V2,
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[UNW_PPC64_V3]=UNW_PPC64_V3,
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[UNW_PPC64_V4]=UNW_PPC64_V4,
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[UNW_PPC64_V5]=UNW_PPC64_V5,
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[UNW_PPC64_V6]=UNW_PPC64_V6,
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[UNW_PPC64_V7]=UNW_PPC64_V7,
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[UNW_PPC64_V8]=UNW_PPC64_V8,
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[UNW_PPC64_V9]=UNW_PPC64_V9,
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[UNW_PPC64_V10]=UNW_PPC64_V10,
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[UNW_PPC64_V11]=UNW_PPC64_V11,
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[UNW_PPC64_V12]=UNW_PPC64_V12,
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[UNW_PPC64_V13]=UNW_PPC64_V13,
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[UNW_PPC64_V14]=UNW_PPC64_V14,
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[UNW_PPC64_V15]=UNW_PPC64_V15,
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[UNW_PPC64_V16]=UNW_PPC64_V16,
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[UNW_PPC64_V17]=UNW_PPC64_V17,
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[UNW_PPC64_V18]=UNW_PPC64_V18,
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[UNW_PPC64_V19]=UNW_PPC64_V19,
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[UNW_PPC64_V20]=UNW_PPC64_V20,
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[UNW_PPC64_V21]=UNW_PPC64_V21,
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[UNW_PPC64_V22]=UNW_PPC64_V22,
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[UNW_PPC64_V23]=UNW_PPC64_V23,
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[UNW_PPC64_V24]=UNW_PPC64_V24,
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[UNW_PPC64_V25]=UNW_PPC64_V25,
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[UNW_PPC64_V26]=UNW_PPC64_V26,
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[UNW_PPC64_V27]=UNW_PPC64_V27,
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[UNW_PPC64_V28]=UNW_PPC64_V28,
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[UNW_PPC64_V29]=UNW_PPC64_V29,
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[UNW_PPC64_V30]=UNW_PPC64_V30,
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[UNW_PPC64_V31]=UNW_PPC64_V31,
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[UNW_PPC64_VRSAVE]=UNW_PPC64_VRSAVE,
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[UNW_PPC64_VSCR]=UNW_PPC64_VSCR,
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[UNW_PPC64_SPE_ACC]=UNW_PPC64_SPE_ACC,
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[UNW_PPC64_SPEFSCR]=UNW_PPC64_SPEFSCR,
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};
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HIDDEN void
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tdep_init (void)
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{
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intrmask_t saved_mask;
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sigfillset (&unwi_full_mask);
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lock_acquire (&ppc64_lock, saved_mask);
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{
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if (!tdep_needs_initialization)
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/* another thread else beat us to it... */
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goto out;
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mi_init ();
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dwarf_init ();
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#ifndef UNW_REMOTE_ONLY
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ppc64_local_addr_space_init ();
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#endif
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tdep_needs_initialization = 0; /* signal that we're initialized... */
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}
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out:
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lock_release (&ppc64_lock, saved_mask);
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}
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