2 * arch/arm/include/asm/processor.h
4 * Copyright (C) 1995-1999 Russell King
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.
11 #ifndef __ASM_ARM_PROCESSOR_H
12 #define __ASM_ARM_PROCESSOR_H
15 * Default implementation of macro that returns current
16 * instruction pointer ("program counter").
18 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
22 #include <asm/hw_breakpoint.h>
23 #include <asm/ptrace.h>
24 #include <asm/types.h>
25 #include <asm/unified.h>
28 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
29 TASK_SIZE : TASK_SIZE_26)
30 #define STACK_TOP_MAX TASK_SIZE
34 #ifdef CONFIG_HAVE_HW_BREAKPOINT
35 struct perf_event *hbp[ARM_MAX_HBP_SLOTS];
39 struct thread_struct {
41 unsigned long address;
42 unsigned long trap_no;
43 unsigned long error_code;
45 struct debug_info debug;
48 #define INIT_THREAD { }
50 #define start_thread(regs,pc,sp) \
52 unsigned long r7, r8, r9; \
54 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \
59 memset(regs->uregs, 0, sizeof(regs->uregs)); \
60 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \
61 current->personality & FDPIC_FUNCPTRS) { \
65 regs->ARM_r10 = current->mm->start_data; \
66 } else if (!IS_ENABLED(CONFIG_MMU)) \
67 regs->ARM_r10 = current->mm->start_data; \
68 if (current->personality & ADDR_LIMIT_32BIT) \
69 regs->ARM_cpsr = USR_MODE; \
71 regs->ARM_cpsr = USR26_MODE; \
72 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
73 regs->ARM_cpsr |= PSR_T_BIT; \
74 regs->ARM_cpsr |= PSR_ENDSTATE; \
75 regs->ARM_pc = pc & ~1; /* pc */ \
76 regs->ARM_sp = sp; /* sp */ \
79 /* Forward declaration, a strange C thing */
82 /* Free all resources held by a thread. */
83 extern void release_thread(struct task_struct *);
85 unsigned long get_wchan(struct task_struct *p);
87 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
88 #define cpu_relax() smp_mb()
90 #define cpu_relax() barrier()
93 #define task_pt_regs(p) \
94 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
96 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
97 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
100 #define __ALT_SMP_ASM(smp, up) \
102 " .pushsection \".alt.smp.init\", \"a\"\n" \
107 #define __ALT_SMP_ASM(smp, up) up
111 * Prefetching support - only ARMv5.
113 #if __LINUX_ARM_ARCH__ >= 5
115 #define ARCH_HAS_PREFETCH
116 static inline void prefetch(const void *ptr)
118 __asm__ __volatile__(
123 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
124 #define ARCH_HAS_PREFETCHW
125 static inline void prefetchw(const void *ptr)
127 __asm__ __volatile__(
128 ".arch_extension mp\n"
138 #define HAVE_ARCH_PICK_MMAP_LAYOUT
142 #endif /* __ASM_ARM_PROCESSOR_H */