riscv: Add STACKPROTECTOR supported

	select HAVE_PERF_EVENTS

	select HAVE_PERF_REGS

	select HAVE_PERF_USER_STACK_DUMP

	select HAVE_STACKPROTECTOR

	select HAVE_SYSCALL_TRACEPOINTS

	select IRQ_DOMAIN

	select MODULES_USE_ELF_RELA if MODULES

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_RISCV_STACKPROTECTOR_H

#define _ASM_RISCV_STACKPROTECTOR_H

#include <linux/random.h>

#include <linux/version.h>

#include <asm/timex.h>

extern unsigned long __stack_chk_guard;

/*

 * Initialize the stackprotector canary value.

 *

 * NOTE: this must only be called from functions that never return,

 * and it must always be inlined.

 */

static __always_inline void boot_init_stack_canary(void)

{

	unsigned long canary;

	unsigned long tsc;

	/* Try to get a semi random initial value. */

	get_random_bytes(&canary, sizeof(canary));

	tsc = get_cycles();

	canary += tsc + (tsc << BITS_PER_LONG/2);

	canary ^= LINUX_VERSION_CODE;

	canary &= CANARY_MASK;

	current->stack_canary = canary;

	__stack_chk_guard = current->stack_canary;

}

#endif /* _ASM_RISCV_STACKPROTECTOR_H */

register unsigned long gp_in_global __asm__("gp");

#ifdef CONFIG_STACKPROTECTOR

#include <linux/stackprotector.h>

unsigned long __stack_chk_guard __read_mostly;

EXPORT_SYMBOL(__stack_chk_guard);

#endif

extern asmlinkage void ret_from_fork(void);

extern asmlinkage void ret_from_kernel_thread(void);