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 #include <asm/vdso/processor.h> 18 19 #ifdef __KERNEL__ 20 #define STACK_TOP ((current->personality & ADDR_LIMIT_32BIT) ? \ 21 TASK_SIZE : TASK_SIZE_26) 22 #define STACK_TOP_MAX TASK_SIZE 23 #endif 24 25 struct debug_info { 26 #ifdef CONFIG_HAVE_HW_BREAKPOINT 27 struct perf_event *hbp[ARM_MAX_HBP_SLOTS]; 28 #endif 29 }; 30 31 struct thread_struct { 32 /* fault info */ 33 unsigned long address; 34 unsigned long trap_no; 35 unsigned long error_code; 36 /* debugging */ 37 struct debug_info debug; 38 }; 39 40 /* 41 * Everything usercopied to/from thread_struct is statically-sized, so 42 * no hardened usercopy whitelist is needed. 43 */ 44 static inline void arch_thread_struct_whitelist(unsigned long *offset, 45 unsigned long *size) 46 { 47 *offset = *size = 0; 48 } 49 50 #define INIT_THREAD { } 51 52 #define start_thread(regs,pc,sp) \ 53 ({ \ 54 unsigned long r7, r8, r9; \ 55 \ 56 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC)) { \ 57 r7 = regs->ARM_r7; \ 58 r8 = regs->ARM_r8; \ 59 r9 = regs->ARM_r9; \ 60 } \ 61 memset(regs->uregs, 0, sizeof(regs->uregs)); \ 62 if (IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && \ 63 current->personality & FDPIC_FUNCPTRS) { \ 64 regs->ARM_r7 = r7; \ 65 regs->ARM_r8 = r8; \ 66 regs->ARM_r9 = r9; \ 67 regs->ARM_r10 = current->mm->start_data; \ 68 } else if (!IS_ENABLED(CONFIG_MMU)) \ 69 regs->ARM_r10 = current->mm->start_data; \ 70 if (current->personality & ADDR_LIMIT_32BIT) \ 71 regs->ARM_cpsr = USR_MODE; \ 72 else \ 73 regs->ARM_cpsr = USR26_MODE; \ 74 if (elf_hwcap & HWCAP_THUMB && pc & 1) \ 75 regs->ARM_cpsr |= PSR_T_BIT; \ 76 regs->ARM_cpsr |= PSR_ENDSTATE; \ 77 regs->ARM_pc = pc & ~1; /* pc */ \ 78 regs->ARM_sp = sp; /* sp */ \ 79 }) 80 81 /* Forward declaration, a strange C thing */ 82 struct task_struct; 83 84 /* Free all resources held by a thread. */ 85 extern void release_thread(struct task_struct *); 86 87 unsigned long get_wchan(struct task_struct *p); 88 89 #define task_pt_regs(p) \ 90 ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1) 91 92 #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc 93 #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp 94 95 #ifdef CONFIG_SMP 96 #define __ALT_SMP_ASM(smp, up) \ 97 "9998: " smp "\n" \ 98 " .pushsection \".alt.smp.init\", \"a\"\n" \ 99 " .long 9998b - .\n" \ 100 " " up "\n" \ 101 " .popsection\n" 102 #else 103 #define __ALT_SMP_ASM(smp, up) up 104 #endif 105 106 /* 107 * Prefetching support - only ARMv5. 108 */ 109 #if __LINUX_ARM_ARCH__ >= 5 110 111 #define ARCH_HAS_PREFETCH 112 static inline void prefetch(const void *ptr) 113 { 114 __asm__ __volatile__( 115 "pld\t%a0" 116 :: "p" (ptr)); 117 } 118 119 #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP) 120 #define ARCH_HAS_PREFETCHW 121 static inline void prefetchw(const void *ptr) 122 { 123 __asm__ __volatile__( 124 ".arch_extension mp\n" 125 __ALT_SMP_ASM( 126 "pldw\t%a0", 127 "pld\t%a0" 128 ) 129 :: "p" (ptr)); 130 } 131 #endif 132 #endif 133 134 #endif 135 136 #endif /* __ASM_ARM_PROCESSOR_H */ 137