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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2019 Keith Packard
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <picotls.h>
#include <string.h>
#include <stdint.h>
/*
* The TLS block consists of initialized data immediately followed by
* zero filled data
*
* These addresses must be defined by the loader configuration file
*/
extern char __tdata_source[]; /* Source of TLS initialization data (in ROM) */
extern char __tdata_start[]; /* Start of static tdata area */
extern char __tdata_end[]; /* End of static tdata area */
extern char __tbss_start[]; /* Start of static zero-initialized TLS data */
extern char __tbss_end[]; /* End of static zero-initialized TLS data */
#ifdef __PICOLIBC_CRT_RUNTIME_SIZE
#define __tdata_size (__tdata_end - __tdata_start)
#define __tbss_size (__tbss_end - __tbss_start)
#define __tbss_offset (__tbss_start - __tdata_start)
#else
extern char __tdata_size[]; /* Size of TLS initized data */
extern char __tbss_size[]; /* Size of TLS zero-filled data */
extern char __tbss_offset[]; /* Offset from tdata to tbss */
#endif
void
_init_tls(void *__tls)
{
char *tls = __tls;
/* Copy tls initialized data */
memcpy(tls, __tdata_source, (uintptr_t) __tdata_size);
/* Clear tls zero data */
memset(tls + (uintptr_t) __tbss_offset, '\0', (uintptr_t) __tbss_size);
}
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