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libspl: lift backtrace into a separate file

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If it's going to be used directly by zdb/ztest, then it sort of doesn't
make sense to carry it with the assert code.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #16181
This commit is contained in:
Rob Norris
2024-05-10 11:26:11 +10:00
committed by Brian Behlendorf
parent e7b451941b
commit 3974ef045e
12 changed files with 426 additions and 79 deletions
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lib/libspl/backtrace.c
+80
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2024, Rob Norris <robn@despairlabs.com>
* Copyright (c) 2024, Klara Inc.
*/
#include <sys/backtrace.h>
#include <stdio.h>
#if defined(HAVE_LIBUNWIND)
#define UNW_LOCAL_ONLY
#include <libunwind.h>
void
libspl_backtrace(void)
{
unw_context_t uc;
unw_cursor_t cp;
unw_word_t ip, off;
char funcname[128];
#ifdef HAVE_LIBUNWIND_ELF
char objname[128];
unw_word_t objoff;
#endif
fprintf(stderr, "Call trace:\n");
unw_getcontext(&uc);
unw_init_local(&cp, &uc);
while (unw_step(&cp) > 0) {
unw_get_reg(&cp, UNW_REG_IP, &ip);
unw_get_proc_name(&cp, funcname, sizeof (funcname), &off);
#ifdef HAVE_LIBUNWIND_ELF
unw_get_elf_filename(&cp, objname, sizeof (objname), &objoff);
fprintf(stderr, " [0x%08lx] %s+0x%2lx (in %s +0x%2lx)\n",
ip, funcname, off, objname, objoff);
#else
fprintf(stderr, " [0x%08lx] %s+0x%2lx\n", ip, funcname, off);
#endif
}
}
#elif defined(HAVE_BACKTRACE)
#include <execinfo.h>
void
libspl_backtrace(void)
{
void *btptrs[100];
size_t nptrs = backtrace(btptrs, 100);
char **bt = backtrace_symbols(btptrs, nptrs);
fprintf(stderr, "Call trace:\n");
for (size_t i = 0; i < nptrs; i++)
fprintf(stderr, " %s\n", bt[i]);
free(bt);
}
#else
void
libspl_backtrace(void)
{
}
#endif