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 32 struct debug_info { 33 #ifdef CONFIG_HAVE_HW_BREAKPOINT 34 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 35 #endif 36 }; 37 38 struct 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 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 59 if (current->personality & ADDR_LIMIT_32BIT) \ 60 regs->ARM_cpsr = USR_MODE; \ 61 else \ 62 regs->ARM_cpsr = USR26_MODE; \ 63 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 64 regs->ARM_cpsr |= PSR_T_BIT; \ 65 regs->ARM_cpsr |= PSR_ENDSTATE; \ 66 regs->ARM_pc = pc & ~1; /* pc */ \ 67 regs->ARM_sp = sp; /* sp */ \ 68 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 69 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 70 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 71 nommu_start_thread(regs); \ 72 }) 73 74 /* Forward declaration, a strange C thing */ 75 struct task_struct; 76 77 /* Free all resources held by a thread. */ 78 extern void release_thread(struct task_struct *); 79 80 /* Prepare to copy thread state - unlazy all lazy status */ 81 #define prepare_to_copy(tsk) do { } while (0) 82 83 unsigned long get_wchan(struct task_struct *p); 84 85 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 86 #define cpu_relax() smp_mb() 87 #else 88 #define cpu_relax() barrier() 89 #endif 90 91 /* 92 * Create a new kernel thread 93 */ 94 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 95 96 #define task_pt_regs(p) \ 97 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 98 99 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 100 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 101 102 /* 103 * Prefetching support - only ARMv5. 104 */ 105 #if __LINUX_ARM_ARCH__ >= 5 106 107 #define ARCH_HAS_PREFETCH 108 static inline void prefetch(const void *ptr) 109 { 110 __asm__ __volatile__( 111 "pld\t%a0" 112 : 113 : "p" (ptr) 114 : "cc"); 115 } 116 117 #define ARCH_HAS_PREFETCHW 118 #define prefetchw(ptr) prefetch(ptr) 119 120 #define ARCH_HAS_SPINLOCK_PREFETCH 121 #define spin_lock_prefetch(x) do { } while (0) 122 123 #endif 124 125 #define HAVE_ARCH_PICK_MMAP_LAYOUT 126 127 #endif 128 129 #endif /* __ASM_ARM_PROCESSOR_H */ 130