| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |