1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * arch/arm/include/asm/processor.h 4 * 5 * Copyright (C) 1995-1999 Russell King 6 */ 7 8 #ifndef __ASM_ARM_PROCESSOR_H 9 #define __ASM_ARM_PROCESSOR_H 10 11 #ifdef __KERNEL__ 12 13 #include <asm/hw_breakpoint.h> 14 #include <asm/ptrace.h> 15 #include <asm/types.h> 16 #include <asm/unified.h> 17 18 #ifdef __KERNEL__ 19 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 20 TASK_SIZE : TASK_SIZE_26) 21 #define STACK_TOP_MAX TASK_SIZE 22 #endif 23 24 struct debug_info { 25 #ifdef CONFIG_HAVE_HW_BREAKPOINT 26 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 27 #endif 28 }; 29 30 struct thread_struct { 31 /* fault info */ 32 unsigned long address; 33 unsigned long trap_no; 34 unsigned long error_code; 35 /* debugging */ 36 struct debug_info debug; 37 }; 38 39 /* 40 * Everything usercopied to/from thread_struct is statically-sized, so 41 * no hardened usercopy whitelist is needed. 42 */ 43 static inline void arch_thread_struct_whitelist(unsigned long *offset, 44 unsigned long *size) 45 { 46 *offset = *size = 0; 47 } 48 49 #define INIT_THREAD { } 50 51 #define start_thread(regs,pc,sp) \ 52 ({ \ 53 unsigned long r7, r8, r9; \ 54 \ 55 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \ 56 r7 = regs->ARM_r7; \ 57 r8 = regs->ARM_r8; \ 58 r9 = regs->ARM_r9; \ 59 } \ 60 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 61 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \ 62 current->personality & FDPIC_FUNCPTRS) { \ 63 regs->ARM_r7 = r7; \ 64 regs->ARM_r8 = r8; \ 65 regs->ARM_r9 = r9; \ 66 regs->ARM_r10 = current->mm->start_data; \ 67 } else if (!IS_ENABLED(CONFIG_MMU)) \ 68 regs->ARM_r10 = current->mm->start_data; \ 69 if (current->personality & ADDR_LIMIT_32BIT) \ 70 regs->ARM_cpsr = USR_MODE; \ 71 else \ 72 regs->ARM_cpsr = USR26_MODE; \ 73 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 74 regs->ARM_cpsr |= PSR_T_BIT; \ 75 regs->ARM_cpsr |= PSR_ENDSTATE; \ 76 regs->ARM_pc = pc & ~1; /* pc */ \ 77 regs->ARM_sp = sp; /* sp */ \ 78 }) 79 80 /* Forward declaration, a strange C thing */ 81 struct task_struct; 82 83 /* Free all resources held by a thread. */ 84 extern void release_thread(struct task_struct *); 85 86 unsigned long get_wchan(struct task_struct *p); 87 88 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 89 #define cpu_relax() \ 90 do { \ 91 smp_mb(); \ 92 __asm__ __volatile__("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"); \ 93 } while (0) 94 #else 95 #define cpu_relax() barrier() 96 #endif 97 98 #define task_pt_regs(p) \ 99 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 100 101 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 102 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 103 104 #ifdef CONFIG_SMP 105 #define __ALT_SMP_ASM(smp, up) \ 106 "9998: " smp "\n" \ 107 " .pushsection \".alt.smp.init\", \"a\"\n" \ 108 " .long 9998b\n" \ 109 " " up "\n" \ 110 " .popsection\n" 111 #else 112 #define __ALT_SMP_ASM(smp, up) up 113 #endif 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 :: "p" (ptr)); 126 } 127 128 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) 129 #define ARCH_HAS_PREFETCHW 130 static inline void prefetchw(const void *ptr) 131 { 132 __asm__ __volatile__( 133 ".arch_extension mp\n" 134 __ALT_SMP_ASM( 135 "pldw\t%a0", 136 "pld\t%a0" 137 ) 138 :: "p" (ptr)); 139 } 140 #endif 141 #endif 142 143 #endif 144 145 #endif /* __ASM_ARM_PROCESSOR_H */ 146