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 #include <asm/unified.h> 26 27 #ifdef __KERNEL__ 28 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 29 TASK_SIZE : TASK_SIZE_26) 30 #define STACK_TOP_MAX TASK_SIZE 31 #endif 32 33 struct debug_info { 34 #ifdef CONFIG_HAVE_HW_BREAKPOINT 35 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 36 #endif 37 }; 38 39 struct thread_struct { 40 /* fault info */ 41 unsigned long address; 42 unsigned long trap_no; 43 unsigned long error_code; 44 /* debugging */ 45 struct debug_info debug; 46 }; 47 48 #define INIT_THREAD { } 49 50 #define start_thread(regs,pc,sp) \ 51 ({ \ 52 unsigned long r7, r8, r9; \ 53 \ 54 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \ 55 r7 = regs->ARM_r7; \ 56 r8 = regs->ARM_r8; \ 57 r9 = regs->ARM_r9; \ 58 } \ 59 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 60 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \ 61 current->personality & FDPIC_FUNCPTRS) { \ 62 regs->ARM_r7 = r7; \ 63 regs->ARM_r8 = r8; \ 64 regs->ARM_r9 = r9; \ 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; \ 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 }) 78 79 /* Forward declaration, a strange C thing */ 80 struct task_struct; 81 82 /* Free all resources held by a thread. */ 83 extern void release_thread(struct task_struct *); 84 85 unsigned long get_wchan(struct task_struct *p); 86 87 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 88 #define cpu_relax() smp_mb() 89 #else 90 #define cpu_relax() barrier() 91 #endif 92 93 #define task_pt_regs(p) \ 94 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 95 96 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 97 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 98 99 #ifdef CONFIG_SMP 100 #define __ALT_SMP_ASM(smp, up) \ 101 "9998: " smp "\n" \ 102 " .pushsection \".alt.smp.init\", \"a\"\n" \ 103 " .long 9998b\n" \ 104 " " up "\n" \ 105 " .popsection\n" 106 #else 107 #define __ALT_SMP_ASM(smp, up) up 108 #endif 109 110 /* 111 * Prefetching support - only ARMv5. 112 */ 113 #if __LINUX_ARM_ARCH__ >= 5 114 115 #define ARCH_HAS_PREFETCH 116 static inline void prefetch(const void *ptr) 117 { 118 __asm__ __volatile__( 119 "pld\t%a0" 120 :: "p" (ptr)); 121 } 122 123 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) 124 #define ARCH_HAS_PREFETCHW 125 static inline void prefetchw(const void *ptr) 126 { 127 __asm__ __volatile__( 128 ".arch_extension mp\n" 129 __ALT_SMP_ASM( 130 WASM(pldw) "\t%a0", 131 WASM(pld) "\t%a0" 132 ) 133 :: "p" (ptr)); 134 } 135 #endif 136 #endif 137 138 #define HAVE_ARCH_PICK_MMAP_LAYOUT 139 140 #endif 141 142 #endif /* __ASM_ARM_PROCESSOR_H */ 143