1 /* 2 * Based on arch/arm/include/asm/processor.h 3 * 4 * Copyright (C) 1995-1999 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #ifndef __ASM_PROCESSOR_H 20 #define __ASM_PROCESSOR_H 21 22 /* 23 * Default implementation of macro that returns current 24 * instruction pointer ("program counter"). 25 */ 26 #define current_text_addr() ({ __label__ _l; _l: &&_l;}) 27 28 #ifdef __KERNEL__ 29 30 #include <linux/string.h> 31 32 #include <asm/fpsimd.h> 33 #include <asm/hw_breakpoint.h> 34 #include <asm/ptrace.h> 35 #include <asm/types.h> 36 37 #ifdef __KERNEL__ 38 #define STACK_TOP_MAX TASK_SIZE_64 39 #ifdef CONFIG_COMPAT 40 #define AARCH32_VECTORS_BASE 0xffff0000 41 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ 42 AARCH32_VECTORS_BASE : STACK_TOP_MAX) 43 #else 44 #define STACK_TOP STACK_TOP_MAX 45 #endif /* CONFIG_COMPAT */ 46 47 #define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK 48 #endif /* __KERNEL__ */ 49 50 struct debug_info { 51 /* Have we suspended stepping by a debugger? */ 52 int suspended_step; 53 /* Allow breakpoints and watchpoints to be disabled for this thread. */ 54 int bps_disabled; 55 int wps_disabled; 56 /* Hardware breakpoints pinned to this task. */ 57 struct perf_event *hbp_break[ARM_MAX_BRP]; 58 struct perf_event *hbp_watch[ARM_MAX_WRP]; 59 }; 60 61 struct cpu_context { 62 unsigned long x19; 63 unsigned long x20; 64 unsigned long x21; 65 unsigned long x22; 66 unsigned long x23; 67 unsigned long x24; 68 unsigned long x25; 69 unsigned long x26; 70 unsigned long x27; 71 unsigned long x28; 72 unsigned long fp; 73 unsigned long sp; 74 unsigned long pc; 75 }; 76 77 struct thread_struct { 78 struct cpu_context cpu_context; /* cpu context */ 79 unsigned long tp_value; 80 struct fpsimd_state fpsimd_state; 81 unsigned long fault_address; /* fault info */ 82 struct debug_info debug; /* debugging */ 83 }; 84 85 #define INIT_THREAD { } 86 87 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) 88 { 89 memset(regs, 0, sizeof(*regs)); 90 regs->syscallno = ~0UL; 91 regs->pc = pc; 92 } 93 94 static inline void start_thread(struct pt_regs *regs, unsigned long pc, 95 unsigned long sp) 96 { 97 start_thread_common(regs, pc); 98 regs->pstate = PSR_MODE_EL0t; 99 regs->sp = sp; 100 } 101 102 #ifdef CONFIG_COMPAT 103 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, 104 unsigned long sp) 105 { 106 start_thread_common(regs, pc); 107 regs->pstate = COMPAT_PSR_MODE_USR; 108 if (pc & 1) 109 regs->pstate |= COMPAT_PSR_T_BIT; 110 111 #ifdef __AARCH64EB__ 112 regs->pstate |= COMPAT_PSR_E_BIT; 113 #endif 114 115 regs->compat_sp = sp; 116 } 117 #endif 118 119 /* Forward declaration, a strange C thing */ 120 struct task_struct; 121 122 /* Free all resources held by a thread. */ 123 extern void release_thread(struct task_struct *); 124 125 /* Prepare to copy thread state - unlazy all lazy status */ 126 #define prepare_to_copy(tsk) do { } while (0) 127 128 unsigned long get_wchan(struct task_struct *p); 129 130 #define cpu_relax() barrier() 131 132 /* Thread switching */ 133 extern struct task_struct *cpu_switch_to(struct task_struct *prev, 134 struct task_struct *next); 135 136 #define task_pt_regs(p) \ 137 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 138 139 #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc 140 #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp 141 142 /* 143 * Prefetching support 144 */ 145 #define ARCH_HAS_PREFETCH 146 static inline void prefetch(const void *ptr) 147 { 148 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); 149 } 150 151 #define ARCH_HAS_PREFETCHW 152 static inline void prefetchw(const void *ptr) 153 { 154 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); 155 } 156 157 #define ARCH_HAS_SPINLOCK_PREFETCH 158 static inline void spin_lock_prefetch(const void *x) 159 { 160 prefetchw(x); 161 } 162 163 #define HAVE_ARCH_PICK_MMAP_LAYOUT 164 165 #endif 166 167 #endif /* __ASM_PROCESSOR_H */ 168