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/* Helper routines for libthread_db.
Copyright (C) 2003-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "thread_dbP.h"
#include <byteswap.h>
#include <assert.h>
#include <stdint.h>
td_err_e
_td_check_sizeof (td_thragent_t *ta, uint32_t *sizep, int sizep_name)
{
if (*sizep == 0)
{
psaddr_t descptr;
ps_err_e err = td_lookup (ta->ph, sizep_name, &descptr);
if (err == PS_NOSYM)
return TD_NOCAPAB;
if (err == PS_OK)
err = ps_pdread (ta->ph, descptr, sizep, sizeof *sizep);
if (err != PS_OK)
return TD_ERR;
if (*sizep & 0xff000000U)
*sizep = bswap_32 (*sizep);
}
return TD_OK;
}
td_err_e
_td_locate_field (td_thragent_t *ta,
db_desc_t desc, int descriptor_name,
psaddr_t idx, psaddr_t *address)
{
uint32_t elemsize;
if (DB_DESC_SIZE (desc) == 0)
{
/* Read the information about this field from the inferior. */
psaddr_t descptr;
ps_err_e err = td_lookup (ta->ph, descriptor_name, &descptr);
if (err == PS_NOSYM)
return TD_NOCAPAB;
if (err == PS_OK)
err = ps_pdread (ta->ph, descptr, desc, DB_SIZEOF_DESC);
if (err != PS_OK)
return TD_ERR;
if (DB_DESC_SIZE (desc) == 0)
return TD_DBERR;
if (DB_DESC_SIZE (desc) & 0xff000000U)
{
/* Byte-swap these words, though we leave the size word
in native order as the handy way to distinguish. */
DB_DESC_OFFSET (desc) = bswap_32 (DB_DESC_OFFSET (desc));
DB_DESC_NELEM (desc) = bswap_32 (DB_DESC_NELEM (desc));
}
}
if (idx != 0 && DB_DESC_NELEM (desc) != 0
&& idx - (psaddr_t) 0 > DB_DESC_NELEM (desc))
/* This is an internal indicator to callers with nonzero IDX
that the IDX value is too big. */
return TD_NOAPLIC;
elemsize = DB_DESC_SIZE (desc);
if (elemsize & 0xff000000U)
elemsize = bswap_32 (elemsize);
*address += (int32_t) DB_DESC_OFFSET (desc);
*address += (elemsize / 8 * (idx - (psaddr_t) 0));
return TD_OK;
}
td_err_e
_td_fetch_value (td_thragent_t *ta,
db_desc_t desc, int descriptor_name,
psaddr_t idx, psaddr_t address,
psaddr_t *result)
{
ps_err_e err;
td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
if (terr != TD_OK)
return terr;
if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
{
uint8_t value;
err = ps_pdread (ta->ph, address, &value, sizeof value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == 32)
{
uint32_t value;
err = ps_pdread (ta->ph, address, &value, sizeof value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == 64)
{
uint64_t value;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
err = ps_pdread (ta->ph, address, &value, sizeof value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == bswap_32 (32))
{
uint32_t value;
err = ps_pdread (ta->ph, address, &value, sizeof value);
value = bswap_32 (value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == bswap_32 (64))
{
uint64_t value;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
err = ps_pdread (ta->ph, address, &value, sizeof value);
value = bswap_64 (value);
*result = (psaddr_t) 0 + value;
}
else
return TD_DBERR;
return err == PS_OK ? TD_OK : TD_ERR;
}
td_err_e
_td_store_value (td_thragent_t *ta,
db_desc_t desc, int descriptor_name, psaddr_t idx,
psaddr_t address, psaddr_t widened_value)
{
ps_err_e err;
td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
if (terr != TD_OK)
return terr;
if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
{
uint8_t value = widened_value - (psaddr_t) 0;
err = ps_pdwrite (ta->ph, address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == 32)
{
uint32_t value = widened_value - (psaddr_t) 0;
err = ps_pdwrite (ta->ph, address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == 64)
{
uint64_t value = widened_value - (psaddr_t) 0;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
err = ps_pdwrite (ta->ph, address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == bswap_32 (32))
{
uint32_t value = widened_value - (psaddr_t) 0;
value = bswap_32 (value);
err = ps_pdwrite (ta->ph, address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == bswap_32 (64))
{
uint64_t value = widened_value - (psaddr_t) 0;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
value = bswap_64 (value);
err = ps_pdwrite (ta->ph, address, &value, sizeof value);
}
else
return TD_DBERR;
return err == PS_OK ? TD_OK : TD_ERR;
}
td_err_e
_td_fetch_value_local (td_thragent_t *ta,
db_desc_t desc, int descriptor_name, psaddr_t idx,
void *address,
psaddr_t *result)
{
td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
if (terr != TD_OK)
return terr;
if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
{
uint8_t value;
memcpy (&value, address, sizeof value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == 32)
{
uint32_t value;
memcpy (&value, address, sizeof value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == 64)
{
uint64_t value;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
memcpy (&value, address, sizeof value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == bswap_32 (32))
{
uint32_t value;
memcpy (&value, address, sizeof value);
value = bswap_32 (value);
*result = (psaddr_t) 0 + value;
}
else if (DB_DESC_SIZE (desc) == bswap_32 (64))
{
uint64_t value;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
memcpy (&value, address, sizeof value);
value = bswap_64 (value);
*result = (psaddr_t) 0 + value;
}
else
return TD_DBERR;
return TD_OK;
}
td_err_e
_td_store_value_local (td_thragent_t *ta,
db_desc_t desc, int descriptor_name, psaddr_t idx,
void *address, psaddr_t widened_value)
{
td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
if (terr != TD_OK)
return terr;
if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
{
uint8_t value = widened_value - (psaddr_t) 0;
memcpy (address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == 32)
{
uint32_t value = widened_value - (psaddr_t) 0;
memcpy (address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == 64)
{
uint64_t value = widened_value - (psaddr_t) 0;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
memcpy (address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == bswap_32 (32))
{
uint32_t value = widened_value - (psaddr_t) 0;
value = bswap_32 (value);
memcpy (address, &value, sizeof value);
}
else if (DB_DESC_SIZE (desc) == bswap_32 (64))
{
uint64_t value = widened_value - (psaddr_t) 0;
if (sizeof (psaddr_t) < 8)
return TD_NOCAPAB;
value = bswap_64 (value);
memcpy (address, &value, sizeof value);
}
else
return TD_DBERR;
return TD_OK;
}
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