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/* Retrieve ELF descriptor used for DWARF access.
Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 2002.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <stddef.h>
#include "libdwP.h"
#ifdef USE_TLS
/* The error number. */
static __thread int global_error;
#else
/* This is the key for the thread specific memory. */
static tls_key_t key;
/* The error number. Used in non-threaded programs. */
static int global_error;
static bool threaded;
/* We need to initialize the thread-specific data. */
once_define (static, once);
/* The initialization and destruction functions. */
static void init (void);
static void free_key_mem (void *mem);
#endif /* TLS */
int
dwarf_errno (void)
{
int result;
#ifndef USE_TLS
/* If we have not yet initialized the buffer do it now. */
once_execute (once, init);
if (threaded)
{
/* We do not allocate memory for the data. It is only a word.
We can store it in place of the pointer. */
result = (intptr_t) getspecific (key);
setspecific (key, (void *) (intptr_t) DWARF_E_NOERROR);
return result;
}
#endif /* TLS */
result = global_error;
global_error = DWARF_E_NOERROR;
return result;
}
INTDEF(dwarf_errno)
/* XXX For now we use string pointers. Once the table stablelizes
make it more DSO-friendly. */
static const char *errmsgs[] =
{
[DWARF_E_NOERROR] = N_("no error"),
[DWARF_E_UNKNOWN_ERROR] = N_("unknown error"),
[DWARF_E_INVALID_ACCESS] = N_("invalid access"),
[DWARF_E_NO_REGFILE] = N_("no regular file"),
[DWARF_E_IO_ERROR] = N_("I/O error"),
[DWARF_E_INVALID_ELF] = N_("invalid ELF file"),
[DWARF_E_NO_DWARF] = N_("no DWARF information"),
[DWARF_E_NOELF] = N_("no ELF file"),
[DWARF_E_GETEHDR_ERROR] = N_("cannot get ELF header"),
[DWARF_E_NOMEM] = N_("out of memory"),
[DWARF_E_UNIMPL] = N_("not implemented"),
[DWARF_E_INVALID_CMD] = N_("invalid command"),
[DWARF_E_INVALID_VERSION] = N_("invalid version"),
[DWARF_E_INVALID_FILE] = N_("invalid file"),
[DWARF_E_NO_ENTRY] = N_("no entries found"),
[DWARF_E_INVALID_DWARF] = N_("invalid DWARF"),
[DWARF_E_NO_STRING] = N_("no string data"),
[DWARF_E_NO_ADDR] = N_("no address value"),
[DWARF_E_NO_CONSTANT] = N_("no constant value"),
[DWARF_E_NO_REFERENCE] = N_("no reference value"),
[DWARF_E_INVALID_REFERENCE] = N_("invalid reference value"),
[DWARF_E_NO_DEBUG_LINE] = N_(".debug_line section missing"),
[DWARF_E_INVALID_DEBUG_LINE] = N_("invalid .debug_line section"),
[DWARF_E_TOO_BIG] = N_("debug information too big"),
[DWARF_E_VERSION] = N_("invalid DWARF version"),
[DWARF_E_INVALID_DIR_IDX] = N_("invalid directory index"),
[DWARF_E_ADDR_OUTOFRANGE] = N_("address out of range"),
[DWARF_E_NO_LOCLIST] = N_("no location list value"),
[DWARF_E_NO_BLOCK] = N_("no block data"),
[DWARF_E_INVALID_LINE_IDX] = N_("invalid line index"),
[DWARF_E_INVALID_ARANGE_IDX] = N_("invalid address range index"),
[DWARF_E_NO_MATCH] = N_("no matching address range"),
[DWARF_E_NO_FLAG] = N_("no flag value"),
[DWARF_E_INVALID_OFFSET] = N_("invalid offset"),
[DWARF_E_NO_DEBUG_RANGES] = N_(".debug_ranges section missing"),
};
#define nerrmsgs (sizeof (errmsgs) / sizeof (errmsgs[0]))
void
__libdw_seterrno (value)
int value;
{
#ifndef USE_TLS
/* If we have not yet initialized the buffer do it now. */
once_execute (once, init);
if (threaded)
/* We do not allocate memory for the data. It is only a word.
We can store it in place of the pointer. */
setspecific (key, (void *) (intptr_t) value);
#endif /* TLS */
global_error = (value >= 0 && value < (int) nerrmsgs
? value : DWARF_E_UNKNOWN_ERROR);
}
const char *
dwarf_errmsg (error)
int error;
{
int last_error;
#ifndef USE_TLS
/* If we have not yet initialized the buffer do it now. */
once_execute (once, init);
if ((error == 0 || error == -1) && threaded)
/* We do not allocate memory for the data. It is only a word.
We can store it in place of the pointer. */
last_error = (intptr_t) getspecific (key);
else
#endif /* TLS */
last_error = global_error;
if (error == 0)
return last_error != 0 ? _(errmsgs[last_error]) : NULL;
else if (error < -1 || error >= (int) nerrmsgs)
return _(errmsgs[DWARF_E_UNKNOWN_ERROR]);
return _(errmsgs[error == -1 ? last_error : error]);
}
INTDEF(dwarf_errmsg)
#ifndef USE_TLS
/* Free the thread specific data, this is done if a thread terminates. */
static void
free_key_mem (void *mem __attribute__ ((unused)))
{
setspecific (key, NULL);
}
/* Initialize the key for the global variable. */
static void
init (void)
{
// XXX Screw you, gcc4, the unused function attribute does not work.
__asm ("" :: "r" (free_key_mem));
if (key_create (&key, free_key_mem) == 0)
/* Creating the key succeeded. */
threaded = true;
}
#endif /* TLS */
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