1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  arch/arm/include/asm/processor.h
  4 *
  5 *  Copyright (C) 1995-1999 Russell King
 
 
 
 
  6 */
  7
  8#ifndef __ASM_ARM_PROCESSOR_H
  9#define __ASM_ARM_PROCESSOR_H
 10
 
 
 
 
 
 
 11#ifdef __KERNEL__
 12
 13#include <asm/hw_breakpoint.h>
 14#include <asm/ptrace.h>
 15#include <asm/types.h>
 16#include <asm/unified.h>
 17#include <asm/vdso/processor.h>
 18
 19#ifdef __KERNEL__
 20#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
 21			 TASK_SIZE : TASK_SIZE_26)
 22#define STACK_TOP_MAX	TASK_SIZE
 23#endif
 24
 25struct debug_info {
 26#ifdef CONFIG_HAVE_HW_BREAKPOINT
 27	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
 28#endif
 29};
 30
 31struct thread_struct {
 32							/* fault info	  */
 33	unsigned long		address;
 34	unsigned long		trap_no;
 35	unsigned long		error_code;
 36							/* debugging	  */
 37	struct debug_info	debug;
 38};
 39
 40/*
 41 * Everything usercopied to/from thread_struct is statically-sized, so
 42 * no hardened usercopy whitelist is needed.
 43 */
 44static inline void arch_thread_struct_whitelist(unsigned long *offset,
 45						unsigned long *size)
 46{
 47	*offset = *size = 0;
 48}
 49
 50#define INIT_THREAD  {	}
 51
 
 
 
 
 
 
 52#define start_thread(regs,pc,sp)					\
 53({									\
 54	unsigned long r7, r8, r9;					\
 55									\
 56	if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) {			\
 57		r7 = regs->ARM_r7;					\
 58		r8 = regs->ARM_r8;					\
 59		r9 = regs->ARM_r9;					\
 60	}								\
 61	memset(regs->uregs, 0, sizeof(regs->uregs));			\
 62	if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) &&			\
 63	    current->personality & FDPIC_FUNCPTRS) {			\
 64		regs->ARM_r7 = r7;					\
 65		regs->ARM_r8 = r8;					\
 66		regs->ARM_r9 = r9;					\
 67		regs->ARM_r10 = current->mm->start_data;		\
 68	} else if (!IS_ENABLED(CONFIG_MMU))				\
 69		regs->ARM_r10 = current->mm->start_data;		\
 70	if (current->personality & ADDR_LIMIT_32BIT)			\
 71		regs->ARM_cpsr = USR_MODE;				\
 72	else								\
 73		regs->ARM_cpsr = USR26_MODE;				\
 74	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
 75		regs->ARM_cpsr |= PSR_T_BIT;				\
 76	regs->ARM_cpsr |= PSR_ENDSTATE;					\
 77	regs->ARM_pc = pc & ~1;		/* pc */			\
 78	regs->ARM_sp = sp;		/* sp */			\
 
 
 
 
 79})
 80
 81/* Forward declaration, a strange C thing */
 82struct task_struct;
 83
 84unsigned long __get_wchan(struct task_struct *p);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 85
 86#define task_pt_regs(p) \
 87	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 88
 89#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
 90#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp
 91
 92#ifdef CONFIG_SMP
 93#define __ALT_SMP_ASM(smp, up)						\
 94	"9998:	" smp "\n"						\
 95	"	.pushsection \".alt.smp.init\", \"a\"\n"		\
 96	"	.align	2\n"						\
 97	"	.long	9998b - .\n"					\
 98	"	" up "\n"						\
 99	"	.popsection\n"
100#else
101#define __ALT_SMP_ASM(smp, up)	up
102#endif
103
104/*
105 * Prefetching support - only ARMv5.
106 */
107#if __LINUX_ARM_ARCH__ >= 5
108
109#define ARCH_HAS_PREFETCH
110static inline void prefetch(const void *ptr)
111{
112	__asm__ __volatile__(
113		"pld\t%a0"
114		:: "p" (ptr));
 
 
115}
116
117#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
118#define ARCH_HAS_PREFETCHW
119static inline void prefetchw(const void *ptr)
120{
121	__asm__ __volatile__(
122		".arch_extension	mp\n"
123		__ALT_SMP_ASM(
124			"pldw\t%a0",
125			"pld\t%a0"
126		)
127		:: "p" (ptr));
128}
129#endif
130#endif
131
132#endif
133
134#endif /* __ASM_ARM_PROCESSOR_H */

 
  1/*
  2 *  arch/arm/include/asm/processor.h
  3 *
  4 *  Copyright (C) 1995-1999 Russell King
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 */
 10
 11#ifndef __ASM_ARM_PROCESSOR_H
 12#define __ASM_ARM_PROCESSOR_H
 13
 14/*
 15 * Default implementation of macro that returns current
 16 * instruction pointer ("program counter").
 17 */
 18#define current_text_addr() ({ __label__ _l; _l: &&_l;})
 19
 20#ifdef __KERNEL__
 21
 22#include <asm/hw_breakpoint.h>
 23#include <asm/ptrace.h>
 24#include <asm/types.h>
 
 
 25
 26#ifdef __KERNEL__
 27#define STACK_TOP	((current->personality & ADDR_LIMIT_32BIT) ? \
 28			 TASK_SIZE : TASK_SIZE_26)
 29#define STACK_TOP_MAX	TASK_SIZE
 30#endif
 31
 32struct debug_info {
 33#ifdef CONFIG_HAVE_HW_BREAKPOINT
 34	struct perf_event	*hbp[ARM_MAX_HBP_SLOTS];
 35#endif
 36};
 37
 38struct thread_struct {
 39							/* fault info	  */
 40	unsigned long		address;
 41	unsigned long		trap_no;
 42	unsigned long		error_code;
 43							/* debugging	  */
 44	struct debug_info	debug;
 45};
 46
 
 
 
 
 
 
 
 
 
 
 47#define INIT_THREAD  {	}
 48
 49#ifdef CONFIG_MMU
 50#define nommu_start_thread(regs) do { } while (0)
 51#else
 52#define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
 53#endif
 54
 55#define start_thread(regs,pc,sp)					\
 56({									\
 57	unsigned long *stack = (unsigned long *)sp;			\
 58	set_fs(USER_DS);						\
 
 
 
 
 
 59	memset(regs->uregs, 0, sizeof(regs->uregs));			\
 
 
 
 
 
 
 
 
 60	if (current->personality & ADDR_LIMIT_32BIT)			\
 61		regs->ARM_cpsr = USR_MODE;				\
 62	else								\
 63		regs->ARM_cpsr = USR26_MODE;				\
 64	if (elf_hwcap & HWCAP_THUMB && pc & 1)				\
 65		regs->ARM_cpsr |= PSR_T_BIT;				\
 66	regs->ARM_cpsr |= PSR_ENDSTATE;					\
 67	regs->ARM_pc = pc & ~1;		/* pc */			\
 68	regs->ARM_sp = sp;		/* sp */			\
 69	regs->ARM_r2 = stack[2];	/* r2 (envp) */			\
 70	regs->ARM_r1 = stack[1];	/* r1 (argv) */			\
 71	regs->ARM_r0 = stack[0];	/* r0 (argc) */			\
 72	nommu_start_thread(regs);					\
 73})
 74
 75/* Forward declaration, a strange C thing */
 76struct task_struct;
 77
 78/* Free all resources held by a thread. */
 79extern void release_thread(struct task_struct *);
 80
 81/* Prepare to copy thread state - unlazy all lazy status */
 82#define prepare_to_copy(tsk)	do { } while (0)
 83
 84unsigned long get_wchan(struct task_struct *p);
 85
 86#if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
 87#define cpu_relax()			smp_mb()
 88#else
 89#define cpu_relax()			barrier()
 90#endif
 91
 92/*
 93 * Create a new kernel thread
 94 */
 95extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 96
 97#define task_pt_regs(p) \
 98	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 99
100#define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
101#define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp
102
 
 
 
 
 
 
 
 
 
 
 
 
103/*
104 * Prefetching support - only ARMv5.
105 */
106#if __LINUX_ARM_ARCH__ >= 5
107
108#define ARCH_HAS_PREFETCH
109static inline void prefetch(const void *ptr)
110{
111	__asm__ __volatile__(
112		"pld\t%a0"
113		:
114		: "p" (ptr)
115		: "cc");
116}
117
 
118#define ARCH_HAS_PREFETCHW
119#define prefetchw(ptr)	prefetch(ptr)
120
121#define ARCH_HAS_SPINLOCK_PREFETCH
122#define spin_lock_prefetch(x) do { } while (0)
123
 
 
 
 
 
 
124#endif
125
126#endif
127
128#endif /* __ASM_ARM_PROCESSOR_H */