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/*
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Author: Rafal Pietruch <r.pietruch@samsung.com>
*/
/**
* @file crash-stack-libunw.c
* @brief unwinding call stacks, functions specific for archs that use only libunwind
*/
#include "crash-stack.h"
#include <libunwind-ptrace.h>
#include <string.h>
#define MAXPROCNAMELEN 512
void _create_crash_stack(Dwfl *dwfl, Elf *core, pid_t pid, Mappings *mappings, Callstack *callstack)
{
// reimplemented based on libunwind tests/test-ptrace.c file
unw_addr_space_t as = 0;
void *ui = 0;
do {
//init before return
callstack->elems = 0;
as = unw_create_addr_space(&_UPT_accessors, 0);
if (!as)
break;
ui = _UPT_create(pid);
if (!ui)
break;
unw_cursor_t cursor;
if (unw_init_remote(&cursor, as, ui) < 0)
break;
char proc_name[MAXPROCNAMELEN];
for (; callstack->elems < sizeof(callstack->proc)/sizeof(callstack->proc[0]);
++callstack->elems) {
unw_word_t ip;
if (unw_get_reg(&cursor, UNW_REG_IP, &ip) < 0)
break;
callstack->proc[callstack->elems].addr = ip;
proc_name[0] = '\0';
unw_word_t off;
unw_get_proc_name(&cursor, proc_name, sizeof(proc_name), &off);
if (strlen(proc_name) > 0)
callstack->proc[callstack->elems].name = strdup(proc_name);
callstack->proc[callstack->elems].offset = off;
if (unw_step(&cursor) <= 0)
break;
}
} while (0);
if (ui)
_UPT_destroy(ui);
if (as)
unw_destroy_addr_space(as);
}
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