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 union debug_insn { 33 u32 arm; 34 u16 thumb; 35 }; 36 37 struct debug_entry { 38 u32 address; 39 union debug_insn insn; 40 }; 41 42 struct debug_info { 43 int nsaved; 44 struct debug_entry bp[2]; 45 #ifdef CONFIG_HAVE_HW_BREAKPOINT 46 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 47 #endif 48 }; 49 50 struct thread_struct { 51 /* fault info */ 52 unsigned long address; 53 unsigned long trap_no; 54 unsigned long error_code; 55 /* debugging */ 56 struct debug_info debug; 57 }; 58 59 #define INIT_THREAD { } 60 61 #ifdef CONFIG_MMU 62 #define nommu_start_thread(regs) do { } while (0) 63 #else 64 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 65 #endif 66 67 #define start_thread(regs,pc,sp) \ 68 ({ \ 69 unsigned long *stack = (unsigned long *)sp; \ 70 set_fs(USER_DS); \ 71 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 72 if (current->personality & ADDR_LIMIT_32BIT) \ 73 regs->ARM_cpsr = USR_MODE; \ 74 else \ 75 regs->ARM_cpsr = USR26_MODE; \ 76 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 77 regs->ARM_cpsr |= PSR_T_BIT; \ 78 regs->ARM_cpsr |= PSR_ENDSTATE; \ 79 regs->ARM_pc = pc & ~1; /* pc */ \ 80 regs->ARM_sp = sp; /* sp */ \ 81 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 82 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 83 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 84 nommu_start_thread(regs); \ 85 }) 86 87 /* Forward declaration, a strange C thing */ 88 struct task_struct; 89 90 /* Free all resources held by a thread. */ 91 extern void release_thread(struct task_struct *); 92 93 /* Prepare to copy thread state - unlazy all lazy status */ 94 #define prepare_to_copy(tsk) do { } while (0) 95 96 unsigned long get_wchan(struct task_struct *p); 97 98 #if __LINUX_ARM_ARCH__ == 6 99 #define cpu_relax() smp_mb() 100 #else 101 #define cpu_relax() barrier() 102 #endif 103 104 /* 105 * Create a new kernel thread 106 */ 107 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 108 109 #define task_pt_regs(p) \ 110 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 111 112 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 113 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 114 115 /* 116 * Prefetching support - only ARMv5. 117 */ 118 #if __LINUX_ARM_ARCH__ >= 5 119 120 #define ARCH_HAS_PREFETCH 121 static inline void prefetch(const void *ptr) 122 { 123 __asm__ __volatile__( 124 "pld\t%a0" 125 : 126 : "p" (ptr) 127 : "cc"); 128 } 129 130 #define ARCH_HAS_PREFETCHW 131 #define prefetchw(ptr) prefetch(ptr) 132 133 #define ARCH_HAS_SPINLOCK_PREFETCH 134 #define spin_lock_prefetch(x) do { } while (0) 135 136 #endif 137 138 #endif 139 140 #endif /* __ASM_ARM_PROCESSOR_H */ 141