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/ptrace.h> 23 #include <asm/types.h> 24 25 #ifdef __KERNEL__ 26 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 27 TASK_SIZE : TASK_SIZE_26) 28 #define STACK_TOP_MAX TASK_SIZE 29 #endif 30 31 union debug_insn { 32 u32 arm; 33 u16 thumb; 34 }; 35 36 struct debug_entry { 37 u32 address; 38 union debug_insn insn; 39 }; 40 41 struct debug_info { 42 int nsaved; 43 struct debug_entry bp[2]; 44 }; 45 46 struct thread_struct { 47 /* fault info */ 48 unsigned long address; 49 unsigned long trap_no; 50 unsigned long error_code; 51 /* debugging */ 52 struct debug_info debug; 53 }; 54 55 #define INIT_THREAD { } 56 57 #ifdef CONFIG_MMU 58 #define nommu_start_thread(regs) do { } while (0) 59 #else 60 #define nommu_start_thread(regs) regs->ARM_r10 = current->mm->start_data 61 #endif 62 63 #define start_thread(regs,pc,sp) \ 64 ({ \ 65 unsigned long *stack = (unsigned long *)sp; \ 66 set_fs(USER_DS); \ 67 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 68 if (current->personality & ADDR_LIMIT_32BIT) \ 69 regs->ARM_cpsr = USR_MODE; \ 70 else \ 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 */ \ 77 regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ 78 regs->ARM_r1 = stack[1]; /* r1 (argv) */ \ 79 regs->ARM_r0 = stack[0]; /* r0 (argc) */ \ 80 nommu_start_thread(regs); \ 81 }) 82 83 /* Forward declaration, a strange C thing */ 84 struct task_struct; 85 86 /* Free all resources held by a thread. */ 87 extern void release_thread(struct task_struct *); 88 89 /* Prepare to copy thread state - unlazy all lazy status */ 90 #define prepare_to_copy(tsk) do { } while (0) 91 92 unsigned long get_wchan(struct task_struct *p); 93 94 #define cpu_relax() barrier() 95 96 /* 97 * Create a new kernel thread 98 */ 99 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 100 101 #define task_pt_regs(p) \ 102 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 103 104 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 105 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 106 107 /* 108 * Prefetching support - only ARMv5. 109 */ 110 #if __LINUX_ARM_ARCH__ >= 5 111 112 #define ARCH_HAS_PREFETCH 113 static inline void prefetch(const void *ptr) 114 { 115 __asm__ __volatile__( 116 "pld\t%a0" 117 : 118 : "p" (ptr) 119 : "cc"); 120 } 121 122 #define ARCH_HAS_PREFETCHW 123 #define prefetchw(ptr) prefetch(ptr) 124 125 #define ARCH_HAS_SPINLOCK_PREFETCH 126 #define spin_lock_prefetch(x) do { } while (0) 127 128 #endif 129 130 #endif 131 132 #endif /* __ASM_ARM_PROCESSOR_H */ 133