mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-11-16 21:27:38 +01:00
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2013 Garmin International
|
|
Contributed by Matt Fischer <matt.fischer@garmin.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 <string.h>
|
|
|
|
#include "libunwind_i.h"
|
|
|
|
struct cb_info
|
|
{
|
|
unw_word_t ip;
|
|
unsigned long segbase;
|
|
unsigned long offset;
|
|
const char *path;
|
|
};
|
|
|
|
static int callback(const struct dl_phdr_info *info, size_t size, void *data)
|
|
{
|
|
int i;
|
|
struct cb_info *cbi = (struct cb_info*)data;
|
|
for(i=0; i<info->dlpi_phnum; i++) {
|
|
int segbase = info->dlpi_addr + info->dlpi_phdr[i].p_vaddr;
|
|
if(cbi->ip >= segbase && cbi->ip < segbase + info->dlpi_phdr[i].p_memsz)
|
|
{
|
|
cbi->path = info->dlpi_name;
|
|
cbi->offset = info->dlpi_phdr[i].p_offset;
|
|
cbi->segbase = segbase;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
PROTECTED int
|
|
tdep_get_elf_image (struct elf_image *ei, pid_t pid, unw_word_t ip,
|
|
unsigned long *segbase, unsigned long *mapoff,
|
|
char *path, size_t pathlen)
|
|
{
|
|
struct cb_info cbi;
|
|
int ret = -1;
|
|
cbi.ip = ip;
|
|
cbi.segbase = 0;
|
|
cbi.offset = 0;
|
|
cbi.path = NULL;
|
|
|
|
/* QNX's support for accessing symbol maps is severely broken. There is
|
|
a devctl() call that can be made on a proc node (DCMD_PROC_MAPDEBUG)
|
|
which returns information similar to Linux's /proc/<pid>/maps
|
|
node, however the filename that is returned by this call is not an
|
|
absolute path, and there is no foolproof way to map the filename
|
|
back to the file that it came from.
|
|
|
|
Therefore, the normal approach for implementing this function,
|
|
which works equally well for both local and remote unwinding,
|
|
will not work here. The only type of image lookup which works
|
|
reliably is locally, using dl_iterate_phdr(). However, the only
|
|
time that this function is required to look up a remote image is for
|
|
ptrace support, which doesn't work on QNX anyway. Local unwinding,
|
|
which is the main case that makes use of this function, will work
|
|
fine with dl_iterate_phdr(). Therefore, in lieu of any better
|
|
platform support for remote image lookup, this function has just
|
|
been implemented in terms of dl_iterate_phdr().
|
|
*/
|
|
|
|
if (pid != getpid())
|
|
{
|
|
/* Return an error if an attempt is made to perform remote image lookup */
|
|
return -1;
|
|
}
|
|
|
|
if (dl_iterate_phdr (callback, &cbi) != 0)
|
|
{
|
|
if (path)
|
|
{
|
|
strncpy (path, cbi.path, pathlen);
|
|
}
|
|
|
|
*mapoff = cbi.offset;
|
|
*segbase = cbi.segbase;
|
|
|
|
ret = elf_map_image (ei, cbi.path);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifndef UNW_REMOTE_ONLY
|
|
|
|
PROTECTED void
|
|
tdep_get_exe_image_path (char *path)
|
|
{
|
|
path[0] = 0; /* XXX */
|
|
}
|
|
|
|
#endif
|