processor.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  arch/arm/include/asm/processor.h
 *
 *  Copyright (C) 1995-1999 Russell King
 */

#ifndef __ASM_ARM_PROCESSOR_H
#define __ASM_ARM_PROCESSOR_H

#ifdef __KERNEL__

#include <asm/hw_breakpoint.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/unified.h>
#include <asm/vdso/processor.h>

#ifdef __KERNEL__
#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
			 TASK_SIZE : TASK_SIZE_26)
#define STACK_TOP_MAX	TASK_SIZE
#endif

struct debug_info {
#ifdef CONFIG_HAVE_HW_BREAKPOINT
	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
#endif
};

struct thread_struct {
							/* fault info	  */
	unsigned long		address;
	unsigned long		trap_no;
	unsigned long		error_code;
							/* debugging	  */
	struct debug_info	debug;
};

/*
 * Everything usercopied to/from thread_struct is statically-sized, so
 * no hardened usercopy whitelist is needed.
 */
static inline void arch_thread_struct_whitelist(unsigned long *offset,
						unsigned long *size)
{
	*offset = *size = 0;
}

#define INIT_THREAD  {	}

#define start_thread(regs,pc,sp)					\
({									\
	unsigned long r7, r8, r9;					\
									\
	if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) {			\
		r7 = regs->ARM_r7;					\
		r8 = regs->ARM_r8;					\
		r9 = regs->ARM_r9;					\
	}								\
	memset(regs->uregs, 0, sizeof(regs->uregs));			\
	if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) &&			\
	    current->personality & FDPIC_FUNCPTRS) {			\
		regs->ARM_r7 = r7;					\
		regs->ARM_r8 = r8;					\
		regs->ARM_r9 = r9;					\
		regs->ARM_r10 = current->mm->start_data;		\
	} else if (!IS_ENABLED(CONFIG_MMU))				\
		regs->ARM_r10 = current->mm->start_data;		\
	if (current->personality & ADDR_LIMIT_32BIT)			\