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>
27 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \
28 TASK_SIZE : TASK_SIZE_26)
29 #define STACK_TOP_MAX TASK_SIZE
33 #ifdef CONFIG_HAVE_HW_BREAKPOINT
34 struct perf_event
*hbp
[ARM_MAX_HBP_SLOTS
];
38 struct thread_struct
{
40 unsigned long address
;
41 unsigned long trap_no
;
42 unsigned long error_code
;
44 struct debug_info debug
;
47 #define INIT_THREAD { }
50 #define nommu_start_thread(regs) do { } while (0)
52 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data
55 #define start_thread(regs,pc,sp) \
57 memset(regs->uregs, 0, sizeof(regs->uregs)); \
58 if (current->personality & ADDR_LIMIT_32BIT) \
59 regs->ARM_cpsr = USR_MODE; \
61 regs->ARM_cpsr = USR26_MODE; \
62 if (elf_hwcap & HWCAP_THUMB && pc & 1) \
63 regs->ARM_cpsr |= PSR_T_BIT; \
64 regs->ARM_cpsr |= PSR_ENDSTATE; \
65 regs->ARM_pc = pc & ~1; /* pc */ \
66 regs->ARM_sp = sp; /* sp */ \
67 nommu_start_thread(regs); \
70 /* Forward declaration, a strange C thing */
73 /* Free all resources held by a thread. */
74 extern void release_thread(struct task_struct
*);
76 unsigned long get_wchan(struct task_struct
*p
);
78 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
79 #define cpu_relax() smp_mb()
81 #define cpu_relax() barrier()
84 #define task_pt_regs(p) \
85 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
87 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
88 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
91 * Prefetching support - only ARMv5.
93 #if __LINUX_ARM_ARCH__ >= 5
95 #define ARCH_HAS_PREFETCH
96 static inline void prefetch(const void *ptr
)
105 #define ARCH_HAS_PREFETCHW
106 #define prefetchw(ptr) prefetch(ptr)
108 #define ARCH_HAS_SPINLOCK_PREFETCH
109 #define spin_lock_prefetch(x) do { } while (0)
113 #define HAVE_ARCH_PICK_MMAP_LAYOUT
117 #endif /* __ASM_ARM_PROCESSOR_H */
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