Release 4.16 arch/arm/include/asm/processor.h

/*
 *  arch/arm/include/asm/processor.h
 *
 *  Copyright (C) 1995-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_PROCESSOR_H

#define __ASM_ARM_PROCESSOR_H

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */

#define current_text_addr() ({ __label__ _l; _l: &&_l;})

#ifdef __KERNEL__

#include <asm/hw_breakpoint.h>
#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/unified.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;
}

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#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)                    \
                regs->ARM_cpsr = USR_MODE;                              \
        else                                                            \
                regs->ARM_cpsr = USR26_MODE;                            \
        if (elf_hwcap & HWCAP_THUMB && pc & 1)                          \
                regs->ARM_cpsr |= PSR_T_BIT;                            \
        regs->ARM_cpsr |= PSR_ENDSTATE;                                 \
        regs->ARM_pc = pc & ~1;		/* pc */			\
        regs->ARM_sp = sp;		/* sp */			\
})

/* Forward declaration, a strange C thing */
struct task_struct;

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

unsigned long get_wchan(struct task_struct *p);

#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)

#define cpu_relax()			smp_mb()
#else

#define cpu_relax()			barrier()
#endif


#define task_pt_regs(p) \
	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)


#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc

#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp

#ifdef CONFIG_SMP

#define __ALT_SMP_ASM(smp, up)						\
	"9998:  " smp "\n"                                              \
        "       .pushsection \".alt.smp.init\", \"a\"\n"                \
        "       .long   9998b\n"                                        \
        "       " up "\n"                                               \
        "       .popsection\n"
#else

#define __ALT_SMP_ASM(smp, up)	up
#endif

/*
 * Prefetching support - only ARMv5.
 */
#if __LINUX_ARM_ARCH__ >= 5


#define ARCH_HAS_PREFETCH


static inline void prefetch(const void *ptr)
{
	__asm__ __volatile__(
                "pld\t%a0"
                :: "p" (ptr));
}

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#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)

#define ARCH_HAS_PREFETCHW


static inline void prefetchw(const void *ptr)
{
	__asm__ __volatile__(
                ".arch_extension        mp\n"
                __ALT_SMP_ASM(
                        WASM(pldw)              "\t%a0",
                        WASM(pld)               "\t%a0"
                )
                :: "p" (ptr));
}
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#endif
#endif


#define HAVE_ARCH_PICK_MMAP_LAYOUT

#endif

#endif /* __ASM_ARM_PROCESSOR_H */
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Directory: arch/arm/include/asm

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