| 1 |
|
| 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 |
|
| 33 | unsigned long address;
|
| 34 | unsigned long trap_no;
|
| 35 | unsigned long error_code;
|
| 36 |
|
| 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 | if (IS_ENABLED(CONFIG_CPU_ENDIAN_BE8)) \
|
| 77 | regs->ARM_cpsr |= PSR_E_BIT; \
|
| 78 | regs->ARM_pc = pc & ~1; \
|
| 79 | regs->ARM_sp = sp; \
|
| 80 | })
|
| 81 |
|
| 82 |
|
| 83 | struct task_struct;
|
| 84 |
|
| 85 | unsigned long __get_wchan(struct task_struct *p);
|
| 86 |
|
| 87 | #define task_pt_regs(p) \
|
| 88 | ((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
|
| 89 |
|
| 90 | #define KSTK_EIP(tsk) task_pt_regs(tsk)->ARM_pc
|
| 91 | #define KSTK_ESP(tsk) task_pt_regs(tsk)->ARM_sp
|
| 92 |
|
| 93 | #ifdef CONFIG_SMP
|
| 94 | #define __ALT_SMP_ASM(smp, up) \
|
| 95 | "9998: " smp "\n" \
|
| 96 | " .pushsection \".alt.smp.init\", \"a\"\n" \
|
| 97 | " .align 2\n" \
|
| 98 | " .long 9998b - .\n" \
|
| 99 | " " up "\n" \
|
| 100 | " .popsection\n"
|
| 101 | #else
|
| 102 | #define __ALT_SMP_ASM(smp, up) up
|
| 103 | #endif
|
| 104 |
|
| 105 | |
| 106 | * Prefetching support - only ARMv5.
|
| 107 |
|
| 108 | #if __LINUX_ARM_ARCH__ >= 5
|
| 109 |
|
| 110 | #define ARCH_HAS_PREFETCH
|
| 111 | static inline void prefetch(const void *ptr)
|
| 112 | {
|
| 113 | __asm__ __volatile__(
|
| 114 | "pld\t%a0"
|
| 115 | :: "p" (ptr));
|
| 116 | }
|
| 117 |
|
| 118 | #if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
|
| 119 | #define ARCH_HAS_PREFETCHW
|
| 120 | static inline void prefetchw(const void *ptr)
|
| 121 | {
|
| 122 | __asm__ __volatile__(
|
| 123 | ".arch_extension mp\n"
|
| 124 | __ALT_SMP_ASM(
|
| 125 | "pldw\t%a0",
|
| 126 | "pld\t%a0"
|
| 127 | )
|
| 128 | :: "p" (ptr));
|
| 129 | }
|
| 130 | #endif
|
| 131 | #endif
|
| 132 |
|
| 133 | #endif
|
| 134 |
|
| 135 | #endif
|