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 #endif /* __KERNEL__ */ 47 48 struct debug_info { 49 /* Have we suspended stepping by a debugger? */ 50 int suspended_step; 51 /* Allow breakpoints and watchpoints to be disabled for this thread. */ 52 int bps_disabled; 53 int wps_disabled; 54 /* Hardware breakpoints pinned to this task. */ 55 struct perf_event *hbp_break[ARM_MAX_BRP]; 56 struct perf_event *hbp_watch[ARM_MAX_WRP]; 57 }; 58 59 struct cpu_context { 60 unsigned long x19; 61 unsigned long x20; 62 unsigned long x21; 63 unsigned long x22; 64 unsigned long x23; 65 unsigned long x24; 66 unsigned long x25; 67 unsigned long x26; 68 unsigned long x27; 69 unsigned long x28; 70 unsigned long fp; 71 unsigned long sp; 72 unsigned long pc; 73 }; 74 75 struct thread_struct { 76 struct cpu_context cpu_context; /* cpu context */ 77 unsigned long tp_value; 78 struct fpsimd_state fpsimd_state; 79 unsigned long fault_address; /* fault info */ 80 struct debug_info debug; /* debugging */ 81 }; 82 83 #define INIT_THREAD { } 84 85 static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) 86 { 87 memset(regs, 0, sizeof(*regs)); 88 regs->syscallno = ~0UL; 89 regs->pc = pc; 90 } 91 92 static inline void start_thread(struct pt_regs *regs, unsigned long pc, 93 unsigned long sp) 94 { 95 unsigned long *stack = (unsigned long *)sp; 96 97 start_thread_common(regs, pc); 98 regs->pstate = PSR_MODE_EL0t; 99 regs->sp = sp; 100 regs->regs[2] = stack[2]; /* x2 (envp) */ 101 regs->regs[1] = stack[1]; /* x1 (argv) */ 102 regs->regs[0] = stack[0]; /* x0 (argc) */ 103 } 104 105 #ifdef CONFIG_COMPAT 106 static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, 107 unsigned long sp) 108 { 109 unsigned int *stack = (unsigned int *)sp; 110 111 start_thread_common(regs, pc); 112 regs->pstate = COMPAT_PSR_MODE_USR; 113 if (pc & 1) 114 regs->pstate |= COMPAT_PSR_T_BIT; 115 regs->compat_sp = sp; 116 regs->regs[2] = stack[2]; /* x2 (envp) */ 117 regs->regs[1] = stack[1]; /* x1 (argv) */ 118 regs->regs[0] = stack[0]; /* x0 (argc) */ 119 } 120 #endif 121 122 /* Forward declaration, a strange C thing */ 123 struct task_struct; 124 125 /* Free all resources held by a thread. */ 126 extern void release_thread(struct task_struct *); 127 128 /* Prepare to copy thread state - unlazy all lazy status */ 129 #define prepare_to_copy(tsk) do { } while (0) 130 131 unsigned long get_wchan(struct task_struct *p); 132 133 #define cpu_relax() barrier() 134 135 /* Thread switching */ 136 extern struct task_struct *cpu_switch_to(struct task_struct *prev, 137 struct task_struct *next); 138 139 /* 140 * Create a new kernel thread 141 */ 142 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 143 144 #define task_pt_regs(p) \ 145 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 146 147 #define KSTK_EIP(tsk) task_pt_regs(tsk)->pc 148 #define KSTK_ESP(tsk) task_pt_regs(tsk)->sp 149 150 /* 151 * Prefetching support 152 */ 153 #define ARCH_HAS_PREFETCH 154 static inline void prefetch(const void *ptr) 155 { 156 asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); 157 } 158 159 #define ARCH_HAS_PREFETCHW 160 static inline void prefetchw(const void *ptr) 161 { 162 asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); 163 } 164 165 #define ARCH_HAS_SPINLOCK_PREFETCH 166 static inline void spin_lock_prefetch(const void *x) 167 { 168 prefetchw(x); 169 } 170 171 #define HAVE_ARCH_PICK_MMAP_LAYOUT 172 173 #endif 174 175 #endif /* __ASM_PROCESSOR_H */ 176