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ae22044da9
The __maybe_unused macro is defined in spl/sys/debug.h Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Martin Matuska <mm@FreeBSD.org> Closes #16229
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2024, Rob Norris <robn@despairlabs.com>
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* Copyright (c) 2024, Klara Inc.
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*/
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#include <sys/backtrace.h>
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#include <sys/types.h>
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#include <unistd.h>
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/*
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* libspl_backtrace() must be safe to call from inside a signal hander. This
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* mostly means it must not allocate, and so we can't use things like printf.
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*/
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#if defined(HAVE_LIBUNWIND)
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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static size_t
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libspl_u64_to_hex_str(uint64_t v, size_t digits, char *buf, size_t buflen)
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{
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static const char hexdigits[] = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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};
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size_t pos = 0;
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boolean_t want = (digits == 0);
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for (int i = 15; i >= 0; i--) {
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const uint64_t d = v >> (i * 4) & 0xf;
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if (!want && (d != 0 || digits > i))
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want = B_TRUE;
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if (want) {
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buf[pos++] = hexdigits[d];
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if (pos == buflen)
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break;
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}
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}
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return (pos);
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}
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void
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libspl_backtrace(int fd)
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{
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ssize_t ret __attribute__((unused));
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unw_context_t uc;
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unw_cursor_t cp;
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unw_word_t loc;
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char buf[128];
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size_t n;
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ret = write(fd, "Call trace:\n", 12);
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unw_getcontext(&uc);
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unw_init_local(&cp, &uc);
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while (unw_step(&cp) > 0) {
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unw_get_reg(&cp, UNW_REG_IP, &loc);
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ret = write(fd, " [0x", 5);
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n = libspl_u64_to_hex_str(loc, 10, buf, sizeof (buf));
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ret = write(fd, buf, n);
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ret = write(fd, "] ", 2);
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unw_get_proc_name(&cp, buf, sizeof (buf), &loc);
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for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {}
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ret = write(fd, buf, n);
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ret = write(fd, "+0x", 3);
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n = libspl_u64_to_hex_str(loc, 2, buf, sizeof (buf));
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ret = write(fd, buf, n);
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#ifdef HAVE_LIBUNWIND_ELF
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ret = write(fd, " (in ", 5);
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unw_get_elf_filename(&cp, buf, sizeof (buf), &loc);
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for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {}
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ret = write(fd, buf, n);
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ret = write(fd, " +0x", 4);
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n = libspl_u64_to_hex_str(loc, 2, buf, sizeof (buf));
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ret = write(fd, buf, n);
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ret = write(fd, ")", 1);
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#endif
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ret = write(fd, "\n", 1);
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}
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}
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#elif defined(HAVE_BACKTRACE)
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#include <execinfo.h>
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void
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libspl_backtrace(int fd)
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{
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ssize_t ret __attribute__((unused));
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void *btptrs[64];
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size_t nptrs = backtrace(btptrs, 64);
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ret = write(fd, "Call trace:\n", 12);
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backtrace_symbols_fd(btptrs, nptrs, fd);
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}
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#else
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#include <sys/debug.h>
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void
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libspl_backtrace(int fd __maybe_unused)
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{
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}
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#endif
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